PLYOMETRIC REBOUNDER OR THE LIKE

CROSS REFERENCE TO RELATED APPLICATIONS

This claims the benefit of U.S. Provisional Application No. 61/523,281, filed August 13, 2011, titled Plyometric Rebounder or the Like.

This claims the benefit of U.S. Provisional Application No. 61/547,665, filed October 14,

2011, titled Plyometric Rebounder or the Like.

This claims the benefit of U.S. Provisional Application No. 61/652,130, filed May 25,

2012, titled Rebounder or the Like Fast Attach Handle Connector, et al.

BACKGROUND AND SUMMARY

This invention relates to relatively small trampoline-type devices for physical exercise. Such devices commonly referred to as "rebounders," generally circular, and sometimes rectangular, with a mat supported by a frame encompassing an area of about 2,000 square inches or less, in particular, devices having a circular frame having diameter of 50 inches or less and devices having frames of noncircular shapes with the frame having at least one lateral dimension of 50 inches or less as measured parallel to the mat. Such devices have a relatively small surface area available for jumping of about 1200 square inches or less, but could be 2000 square inches or about equal to the frame area by using an atypical rebounder design. An example of a common rebounder device is shown in U.S. Patent No. 7,094,181. The instant system relates to a trampoline large enough for a single adult-sized user weighing less than 400 lbs, with a diameter from about 28 inches to less than 50 inches in diameter. Such devices, like larger trampolines, have a bed or mat that serves as a rebounding surface and that is made of flexible fabric. The mat is attached to a frame having a central opening by one or more elastic members, which may be plural spring elements. At least a portion of the mat thus is suspended within the central opening. A plurality of legs supports the frame at a distance above the ground. The trampoline may be square, rectangular, circular or oval, or any number of various polygonal shapes. The frame or attached members may be made of one of several materials, such as metals like steel, aluminum, or other alloy; or, molded plastics, composite, or other similar materials; including natural materials such as bamboo or laminated woods, or some combination of same. Disclosed herein are trampoline-type devices that comprise a frame with a diameter of about 50 inches or less, large enough to support a single user, but not large enough to safely support two adult users; such device is supported by plural legs or vertical extending frame structure(s), with a

substantially horizontal frame.

Disclosed is a configuration that allows one or more support members to absorb the impact of a weighted object such that counter flex and frame rebound occur to help maintain the device in a substantially stationary position on the ground surface. The presently described device does not suffer ground-creep across the floor surface due to impacts of a thrown object; and does so without the need of additional frame segments running in contact with the floor or ground surface creating triangular attachment points for rigidity, and without the need for additional weights being added to the framing. The legs may include integral parts that allow the surface of the rebounder bed to be tilted at one or more angles from horizontal to 90 degrees.

Disclosed are trampoline-type devices that comprise an encompassing frame supported by plural legs that may be altered or adjusted, either with existing parts, or additional parts, such that the rebounder surface may be altered to various oblique angles and from zero degrees, to 90 degrees, to create what is commonly known as a plyometric rebounder device. The angle may also be altered to one beyond 90 degrees to 180 degrees in some possible embodiments.

Also disclosed are add-on and/or retrofit parts that allow the surface of the rebounder to be tilted from zero up to 90 degrees from horizontal. Also disclosed is a portable system whose parts may be separated and packed in a small space and may be assembled to produce a plyometric rebounder device; either as part of a rebounder package, or as a retrofit to an existing rebounder.

Disclosed are trampoline-type devices as previously described, but with the frame able to fold in order to facilitate storage and transport.

One of the most significant aspects of the presently described system and its many embodiments is the extreme portability of the plyo members and therefore the complete device. No plyometric systems previously available, afford such a dramatic improvement in this utility. The ease with which a rebounder can now be converted to a plyometric device; and the ease with which one may store and carry it, greatly enhances the utility of the device for trainers, home users, and commercial gyms, due to the ability to create a dual-use product that does not have to sacrifice performance for convenience. Trainers, for example, have been unable to transport a prior plyometric rebounder with them when traveling to clients and various locations. With this system, they can much more easily perform this task; thus creating an entirely new class of training options that they are able to provide their customers. These same benefits accrue to home users, who always desire the ability to "put away" or store fitness devices when guests arrive. Few homeowners or apartment dwellers have the luxury of a separate room in their home for housing fitness equipment. So, home owners or apartment dwellers give up certain activities and training benefits for lack of space. Plyo training is known to be extremely beneficial, but is usually dropped from a home fitness regimen due to the amount of space these products have traditionally occupied, and because they cannot be broken down for easy storage, unless space is made available in a garage or an outside shed, or they are compelled to leave an expensive product under a tarp outside. With the instant devices, a home owner may now have a rebounder strong enough for vigorous use and jumping; and then also have a plyometric device using the exact same rebounder; with the ability to store the product in the home and out of sight.

Additionally, commercial businesses and gyms have the ability to expand their product offerings, even where space is at a premium in their facilities. Whole new courses, classes, and services are able to be added to the business model. Some examples will be the ability to offer group mini trampoline classes that include plyometric regimens during the same class, and with the same equipment. After the class, the plyometric rebounders may be folded, and broken down, for easy storage or alternative use; and the space once occupied may be made available for other classes, using different fitness accessories and equipment, or none at all. Finally, the presently described system is also advantageous in that it can be retrofitted to many styles of existing rebounders; something not previously available to the market.

The foregoing and other objects, features, and advantages of the invention will become more apparent from the following detailed description, which proceeds with reference to the accompanying figures.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 A is an isometric view of a rebounder with an adjustable plyometric accessory attached.

Fig. IB is a side view of a plyometric rebounder set at a 45 degree angle with an adjustable plyometric accessory attached.

Fig. 1C is an isometric view of a base footing of a plyometric accessory.

Fig. ID shows a method of connecting a plyometric accessory to a rebounder leg securable by a cam lock type device.

IE is an isometric view of a plyometric accessory with an asymmetrical foot base. Fig. IF shows a rebounder with curved legs using a plyometric accessory.

Fig. 1G shows a rebounder with straight legs using a plyometric accessory.

Fig. 1H is a front view of a plyometric front support foot.

Fig. II is a side cross section view of a plyometric front support foot.

Fig. 1J is a side view showing a plyometric front support foot attached to a rebounder tilted at an angle.

Fig. 2A is a rear isometric view of a plyometric rebounder stiffened with tension wires crossing between the rear support members or tubes.

Fig. 2B is a rear view of a plyometric rebounder where the rear support members or tubes are stiffened with tension wires.

Fig. 3 is an isometric view of a plyometric rebounder with an adjustable extended rear support ground surface bar that may be narrowed or widened to control tilting when a rebounding surface is struck by an object.

Fig. 4A is an isometric view of a rebounder equipped with a handle that is adjustable to modify the angle of a rebounder.

Fig. 4B is an isometric view showing an example of how the handle of Fig. 4A may be adjusted to convert a rebounder to a plyometric device.

Fig. 4C is a side view a device tilted to approximately 45 degrees.

Fig. 4D is an isometric view of a rebounder with a handle attached upside down or in a reversed direction

Fig. 5 A shows a rebounder and two detached portable independent extension legs.

Fig. 5B shows an isometric rear view of the rebounder with the two portable independent extension legs attached.

Fig. 6 A is a side view of the air spring plyometric rebounder tilted at 45 degrees.

Fig. 6B is a front isometric view of the air spring plyometric rebounder.

Fig. 6C is a rear isometric view of the air spring plyometric rebounder.

Fig. 6D is a side cross section view showing the inside of the air spring.

Fig. 6E is a side cross section view showing the air spring replaced with a coil spring. Fig. 7 A is a side view of the leaf spring plyometric rebounder.

Fig. 7B is a front isometric view of the leaf spring plyometric rebounder.

Fig. 7C is a rear isometric view of the leaf spring plyometric rebounder.

Fig. 8A is a side view of snap-on plyometric attachments tilting a rebounder at 45 degrees.

Fig. 8B is an isometric view of the snap-on plyometric rebounder.

Fig. 8C is a close-up view of the 4 snap-on components necessary to connect the plyometric legs to the rebounder

Fig.8D is an isometric view of the snap-on frame connector.

Fig. 8E is an isometric view of the snap-on leg connector.

Fig. 9A is a front isometric view of the adjustable crossbar plyometric rebounder.

Fig. 9B is a side view of the adjustable crossbar plyometric rebounder tilted at 45 degrees.

Fig. 9C is a top view of the adjustable crossbar plyometric rebounder

Fig. 9D is a rear isometric view of the adjustable crossbar plyometric rebounder.

Fig. 10A is a side view of a plyometric accessory set to 90 degrees.

Fig. 10B is a front isometric view of the 90 degree plyometric rebounder.

Fig. IOC is a rear isometric view of the 90 degree plyometric rebounder.

Fig. 11 A is a rear view of the inflatable leg tube plyometric rebounder.

Fig. 1 IB is a cross section side view of the inflatable leg tube plyometric rebounder. Fig. 11C is a rear isometric view of the inflatable leg tube plyometric rebounder.

Fig. 12A is a side view of an inflatable curtain plyometric rebounder.

Fig. 12B is an isometric view of an inflatable curtain plyometric rebounder.

Fig. 12C is a rear view of an inflatable curtain plyometric rebounder.

Fig. 12D is a cross section side view of an inflatable curtain plyometric rebounder.

Fig. 13A is a side view of the flat base plyometric rebounder.

Fig. 13B is a front isometric view of the flat base plyometric rebounder.

Fig. 13C is a rear isometric view of the flat base plyometric rebounder. Fig. 14A is a rear view of the single arm plyometric rebounder.

Fig. 14B is a side view of the single arm plyometric rebounder.

Fig. 14C is a rear isometric view of the single arm plyometric rebounder.

Fig. 15A is a side view of the telescoping leg plyometric rebounder in the flat position.

Fig. 15B is an isometric view of the telescoping leg plyometric rebounder in the flat position.

Fig. 15C is a side view of the telescoping leg plyometric rebounder in the angled position.

Fig. 15D is an isometric view of the telescoping leg plyometric rebounder in the angled position.

Fig.l6A is a front view of a plyometric rebounder with an extreme stability kit.

Fig.l6B is a side view of a plyometric rebounder with an extreme stability kit.

Fig.l6C is front angle view of a plyometric rebounder with an extreme stability kit.

Fig.l6D is a front angle view of a plyometric rebounder with an extreme stability kit without a middle cross bar.

Fig.17 A is an angled view of a plyometric rebounder with a front support base.

Fig.l7B is a side view of the rebounder set at a 45 degree tilt.

Fig.l7C is a side view of the rebounder set at a 30 degree tilt.

Fig.l7D is an isometric exploded view of the front support base.

Fig. 18A is an isometric view of a plyometric rebounder with dual front support legs.

Fig. 18B is a side view of a plyometric rebounder with dual front support legs.

Fig. 18C is a front view of a plyometric rebounder with dual front support legs.

Fig. 19A is an isometric view of a plyometric rebounder with a single T shaped front support.

Fig. 19B is a side view of a plyometric rebounder with a single T shaped front support. Fig. 19C is a front view of a plyometric rebounder with a single T shaped front support. Fig. 19D is an isometric view of a single T shaped front support with snap on connectors.

Fig. 20A is an isometric view of a plyometric rebounder with a single front support.

Fig. 20B is a side view of a plyometric rebounder with a single front support tilted at 45 degrees.

Fig. 20C is a side view of a plyometric rebounder with a single front support tilted at 30 degrees.

Fig. 20D shows the front support unattached to a plyometric rebounder.

Fig. 21 A is a plyometric rebounder accessory taken apart and stacked for transport.

Fig. 21B shows the small carry container that the plyometric accessory fits into when it is broken down.

Fig. 21C shows a front view of the plyometric rebounder accessory carry bag. Fig. 21D is a side view of the plyometric rebounder accessory carry bag.

DETAILED DESCRIPTION

Trampoline-type devices comprise an encompassing frame supported by plural legs that may be altered or adjusted, either with existing parts, or additional parts, such that the rebounder surface may be angled to create what is commonly known as a plyometric rebounder. Most prior plyometric rebounders, where a ball may be thrown against it, such that it rebounds back to the individual throwing the ball, exist, but are limited to the rebounding of a ball only, and were never intended or designed to additionally support a user jumping on it, as is done on a standard rebounder or mini trampoline. Often, the cross-over use of terms like "rebounder" and

"trampoline" obscures the clear separation of function. Also, prior plyo type ball rebounders are generally heavy or have poor portability due to the increased weight or volume of framing that is added to the supporting structure, as well as the cumbersome nature of the additional support framing regardless of weight.

The portability of the presently described system was counterintuitive as it was not believed that multiple parts could be connected to each other to form a rebounding structure that was stable enough to support a user throwing a heavy ball against the device, and have the device remain sufficiently stable for use, both as a ball rebounder and also as a trampoline capable of supporting the vigorous rebounding and jumping of an adult sized user, when not configured for ball rebounding. This has been born out in the prior art. Such plyometric devices are generally much more cumbersome due to the weight and/or increased volume added by a supporting frame structure used to increase rigidity. Even when the framing is not overly heavy, the added volume of the superstructure to the jump surface makes for a far less portable device. This lack of portability has foreclosed a trainer or user the benefit of an easily transportable structure that both serves as a robust mini-trampoline and angled plyometric ball rebounder.

Presently described designs include additional framing for rigidity and often include framing members that allow weight plates to be added to the framing to assist in holding the device stationary during use, and to reduce or stop what is known as "ground creep" or "floor creep." Ground creep is the undesired movement of the plyometric framing across the ground surface as a result of impacts of a thrown object (or person) against the angled device. It is a challenge for the industry, in those users, trainers, or gyms who do not want the devices jerking or creeping or sliding on the floor, away from the user (and towards others) as they throw an object such as a ball against the angled rebound surface. The impact of the weighted object must be significant enough to cause the ground creep. Significant impact is defined simply as the force just sufficient enough to cause the entire structure to slide any distance when a ball or other weighted object is thrown against the angled rebound surface.

There are several solutions that have historically been used to address this challenge of creep. Historically the primary design criterion has been achievement of a consistent rebound for the object, balls say, against the device. Thus, the prior art includes additionally reinforced framing of the plyo device so that the rebounder is as rigid as possible. The more rigid the frame of a rebounder, the more consistent the bounce-back of a ball thrown. Also, by having a more rigid structure, the spring members bear more of the impact force of the thrown object for rebound. And, because of the stiffness, the frame will not torque or rotate from the ball impacts. If a plyometricly angled frame is not so secured, then a heavy object thrown against it, will cause, not only the spring members to affect rebound, but also cause the frame to affect rebound due to twist, torque or rotation in a way that causes the frame to interfere with the angle of the return trajectory of the rebounding object. Bracing the plyo device so that a framing triangle attachment points from the upper and lower end of the plyo support member(s) is formed helps ensure that the rebounding object bounces back in the most predictable way possible. Spring members are generally connected in a set and symmetrical pattern and have no less than two connection points at each spring end; and therefore produce predictable rebounding of objects or people. An insufficiently rigid frame can twist from impacts and results in less predictable rebounds, as the torque or twist of the frame will vary according to the weight and where an impact lands. Spring members are far more forgiving due to their built in elasticity and their equidistant and symmetrical spacing around the rebound surface. It therefore has been standard practice to make the inelastic frame as rigid as possible to eliminate torque and thus gain a much more consistent bounce-back of the thrown object. Removing such bracing members has not been considered for this reason. The alternative has always been viewed as the less stable and therefore less preferred alternative.

In the presently describe system, the support members are sufficiently strong to support the trampoline at a desired angle from horizontal during impact by a ball. But the support members are flexible due to a frame structure that lacks the triangular connections of a frame structure having a rigid member extending along or near the floor between the support members and the trampoline. Because the angle is supported by framing that does not create a triangularly rigid structure where all three legs of the triangle are attached to each other to form a completely closed structure, rebounding objects cause the frame to flex slightly. However, it has been learned that the feet of such a frame "slide" at different rates relative to each other and not in unison. The movement changes slightly depending on where the object or ball strikes the rebound surface.

So, instead of a typical triangular structure, an inverted "V" or "teepee" or tent structure is formed that purposefully lacks a rigid cross support base member or members connecting the lower portions of the support members to any portion of the rebounder frame near the floor, which would create the afore-described closed triangle framing structure. The unexpected result has been that frame floor creep is dramatically reduced or eliminated. The permitted inchworm- like flex of the teepee or tent design allows for a very consistent "give" so long as the rear members are sufficiently rigid along their vertical or linear length. Embodiments shown herein perform that function. The support members allow the frame to flex from the impact of a heaving object, but are rigid enough to maintain a sufficiently consistent rebound of the ball, such that a user does not noticeably suffer any inconsistent thrown ball rebounds. The different rate of flex creates a "flex -back" effect that serves to offset the floor creep. The result is that the plyo device stays substantially in place during use.

Prior devices, due to their typical rigidity from triangular framing connections, often turn the structure into a "sled" wherein the entire plyo device moves as one unit, due to heavy ball impacts. To counteract this effect, several common solutions have been employed. One is to set the plyometric device against a wall or elevated structure, against which the creeping rebounder motion is retarded. Thus, the wall or a barrier greater than a few inches in height provides a stop against which the sliding structure meets push-back resistance. The disadvantage of this method is that one requires a wall which limits the use and placement of the device. If the barrier is placed away from the wall, say as an elevated base or board, a tripping hazard is created;

something not preferred in either a busy home or commercial gym environment.

As previously discussed, the standard practice to improve the performance of a plyo rebound device has been to make the supporting structure as stiff as possible, so that only the elastic spring members may take on the primary task of absorbing the impacts of a thrown ball and rebounding same in a consistent pattern. Such designs generally include a framing structure that runs along the floor and attaches at both the portion of the device closest to the floor, and at least one second attachment at or near the highest point of the device from the floor surface. Having additional support members that run along or just above the floor are not absolutely necessary so long as a triangular attachment occurs, such that the instant systems' teepee configuration is avoided. A sideways "X" can be used to add rigidity. However, such a design is not as stiff as running additional support members along or near the ground surface, making up the bottom of a triangular frame structure. In each event, the result is to configure a triangular structure, which has been believed to be the best method for consistent functioning and rebounding for the plyo device. The outcome of this common configuration is that the vertical members supporting the plyo device are unable to flex in any practically relevant way. Aside from the near microscopic flex inherent in metals and other such materials, the vertical members, due to their multiple attachment points below and above, simply do not flex in any functionally meaningful way. This rigidity is by design as this has been thought the better method of producing an effectively functioning plyo rebounder. The inevitable floor creep has always been treated as the secondary problem to solve.

The prior solution to the very stiff structures of the prior art has been to add separate weighting, almost like the addition ballast to a ship, to help keep the device from sliding or moving across the floor during use. Some designs include vertical pole segments that allow for free-bar weights or plates to be slid down onto them, which in turn, dramatically increase the relative weight of the structure and plyo device. Sandbags have been suggested as well; as well as suggestions that the device be strapped, bolted, or otherwise secured to the ground surface. The key idea is to make the structure as heavy as necessary to minimize floor creep. Such so-called solutions to floor creep create an additional downside in that portability is greatly impaired for the whole package. So, despite the possibility of a light frame, one must still account for separate and additional ballast or weights, that either must be carried in addition to the plyo device itself; or the additional stabilizing weights must be front-loaded or otherwise available and stored at the destination of where the plyo device is being transported. Finally, in practice, the additional multipoint attachment of the frame superstructure has not successfully stopped floor creep. Additional weights or placement against an elevated structure is required due to the previously described "sled" effect. Thus, prior designs have resulted in extremely stiff or rigid plyo platforms that work very well for ball rebounding, but suffer the downside of floor creep, such that additional weight or ground securing is common.

An unexpected benefit of the presently described system is that all of such additional weight and framing and limits to floor placement locations are unnecessary. It was surprising to learn that such reinforcement and increased weight or mass was not necessary for the presently described system to function within expected parameters; in other words, to function as a stable platform against which heavy objects could be thrown and rebounded off of the surface without suffering the common and unwanted floor creep.

As discussed, many prior plyometric devices rely heavily on mass and/or additional framing to accomplish the goal of keeping the plyometric device steady on the ground during use, even installing heavy metal vertical bars or poles that permit plates of weights to be stacked on the device to minimize movement, sliding, and tipping. These high mass or volume devices are designed to accommodate the force generated by heavy medicine balls as opposed to light balls. The heavier balls add to the rehabilitative range and benefit of the plyometric devices. It was thought that a heavy ball required a heavy and/or as inflexible framed plyometric rebounder to withstand ongoing use while still maintaining stability. Prior to testing the present system, it was not expected that it would reduce floor creep. It was a surprise to discover in testing that floor creep was reduced when the structure was made less rigid by keeping the ground portion of the framing open in a teepee or tent type of configuration, where one leg of a triangle is left unconnected. It was learned during the development of this system, that such additional weight, reinforcement and clamping was not required for the final designs. This was true, even when heavy medicine balls, exceeding 20 lbs. in weight, were thrown repeatedly at the device from every angle of direction that could be achieved. The result is a structurally sound device with a much improved portability over previous designs. The instant device creates new opportunities for trainers and others in the fitness industry that was not seriously considered before. The instant system creates a new market and enables new business opportunities for trainers, gyms, and home users.

While trainers appreciate the benefits of plyometric ball rebounders, their lack of easy portability and their lack of practical duel use, has basically foreclosed the possibility of using plyometric device in any scenario that required convenient portability. For example, trainers often travel to their clients to accommodate their busy schedules. An important part of the industry is to make "house calls" to where their clients live or work. The instant device allows a trainer to portably combine or couple the known benefits of plyometric training with the known benefits of trampolining. Despite past good intentions, this has never been achieved from a practical perspective until the instant product became available. A rebounder for jumping may now be easily and practicably converted to a plyometric ball rebounder, without the need of a more cumbersome base framing structure integrated with the device or traditional triangular frame connections to reinforce the stability of the structure; and yet may still be easily carried on their person, and/or in their vehicles, while traveling to client homes and businesses.

Additionally, if the client already owned a rebounder or had one at their work site, the trainer would need only to carry the portable plyo attachments described herein, minus a rebounder, and simply attach them to the client's rebounder, thus converting a device that was then capable of the new duel use. Therefore, a whole new range of exercises, not previously available to a trainer, may now be added to his or hers exercise program and repertoire on behalf of his or her clients. This practical portability and flexibility was unavailable due to reliance on standard engineering principles in the effort to create a more rigid frame structure for a workable plyo device.

The portability of this system benefits the home user in a similar ways, permitting one to add plyometric exercises to the already known benefits of trampolining. These benefits all accrue, with a product that is easily broken down and stored out of site. The presently described designs may also be used in concert with a folding mini trampoline or rebounder as well, resulting in even greater portability for trainers, clubs, and home users alike. Finally, in contrast to known previous art, the instant system permits modification of existing mini-trampolines not originally intended for the purpose, to be converted to use as a plyometric ball rebounder. And because the plyo attachments are relatively small, distinct, and highly portable, they are significantly different from a device that is burdened by an integrated framing structure.

Plyometric rebounders (that may also function as a trampoline used by a person for jumping), as currently used in gyms, have framing rails covering the entire footprint of the rebounder that is in contact with the ground surface upon which the device rests. An example of this can be seen in US Patent 8,043,172, Campanaro et al. These types of plyo devices ascribe to a philosophy of the need for a full floor support system utilizing a series of horizontally placed framing to improve the stability of the device. These devices can be very heavy, and even when made with a lighter metal structure, are not portable to the average user or trainer due to the increased volume of the framing and support structure, as well as still consuming a large footprint even when folded up. This creates a problem of the device being less effectively usable as a portable rebounder upon which an average adult user may viperously jump. Also, even if lighter, the existence of a metal frame structure that includes framing on the floor is cumbersome, unwieldy and not easily portable as is the instant system. Such lighter framing of the standard plyo frame structures also creates durability problems where the device can break down or weaken from repeated or vigorous jumping use; or the weight and strength of a user must be limited or moderated so as to stay within performance limitations.

The result of the above mentioned problems is that, while they are advertised as rebounders for jumping, they are much less likely to be used for that purpose. They become de facto much more restricted to the plyometric function of throwing a ball against it. And as discussed previously, such devices are not readily portable for either the professional trainer meeting clients, or the home user, desiring to store the product out of site when a living space is not being used as an exercise area. Additionally, when given the option of jumping on a traditional rebounder versus jumping on such prior "dual use" devices, the user invariably uses the trampoline dedicated to the jumping function. Colloquially, they are "a jack of all trades but a master of none." A very great advantage of the instant system is that instead of converting a device that is primarily a plyometric ball rebounder that may secondarily be more gently used as a light duty rebounder; one may now take a robust, heavy-jumping rebounder and convert it to equally heavy and robust plyo ball rebounder. The instant system is maximally strong in both uses, whereas the typical plyo rebounder for rebounding thrown balls and the like makes for a fairly poor or less robust jumping device.

The instant system dispenses with these challenges by simply changing the frame configuration based upon the use envisioned the use of much fewer support members, due to the need to allow for necessary flex back that minimizes floor creep. Thus, when used as a rebounder, the plyo parts are not attached to the rebounder at all, creating a safe and sturdy platform for vigorous jumping activity that suffers on interference from those members and framing that are designed primarily to support the plyo function. But, when the light weight plyo parts are attached, the rebounder is no longer "designed" for jumping use at all, but set for plyo use. The lighter weight is not a factor and switching between 'settings' is easy and quick. The presently described system is both durable and effective as a rebounding device, but may also be readily and quickly modified into a plyometric device and back again; without losing or giving up any functionality in either form. This is a significant improvement over the prior art. For example, Campanaro et al. includes an additional hoop or rail at the edge of the jump surface that undermines the use of the device for jumping by creating a hazard for footfalls. Elderly, weak, distracted users risk striking or tripping on it when jumping.

This system has several additional advantages over the prior art. It is much lighter weight results in a highly portable plyometric rebounder that is available to many more users than has been previously achievable. Also, the system may be connected as an accessory to an existing conventional mini-trampoline that was not originally designed to accommodate the plyometric function of bouncing a ball at an angle, both from and to a user. Also, this system has several other embodiments that continue to keep the product light, portable, and very strong. Prior so-called convertible rebounder-to-plyo devices primarily utilize floor-based framing members that interfere with a jumper's landing in a way different, but no less concerning for a vigorous jumper. The jumper must always be concerned with striking the rails below the jumps surface when the surface is horizontal during a landing. Injury such as an ankle twist is much more likely, thus forcing the user to be much gentler in their jumps. Heavier users have to be even more careful. Bottoming out (the act of striking the ground surface at the bottom of a rebound) is so common in mini trampolining that a continuous hazard exists with many of these products that are sold as duel use products. Another problem is that the jump surface is generally very close to the floor with these devices, which also interferes with the products usefulness as a trampoline training device. In contrast, the instant device allows for a rebounder that permits much harder and heavier jumping, thus expanding the user pool that can benefit from the device. This advantage co-exists with the extremely portable conversion capability to a plyo rebounder for ball bounce-back training. Athletes and serious fitness users gain a product much more suited to their increased strength and physical output. One need not give up or reduce one capability to gain the other, resulting in a great improvement over prior art, with expanded use opportunities for a greater number of users.

The following describe several embodiments where the utility of the presently described system is shown: A system having the benefits is shown in FIGS. 1A-1G. An existing rebounder has detachable support members in the form of two leg extensions or attachments that are connected to two of the rebounder legs, which are also connected to a horizontal cross bar and two base footings. Each detachable support member has an upper end portion and a lower end portion. The leg extensions are attached to the two base footings and the horizontal cross bar runs upon the ground surface from footing to the other. The upper end portion of each leg extension is attached to a leg, the support member being sufficiently rigid and the attachment being sufficiently fixed that, when the upper end portion is attached to a leg or to the frame, the lower end portion rests on the ground and supports the frame at an angle to the horizon with some of the legs touching the ground and some of the legs not touching the ground, the ground- touching legs not being blocked from moving toward the lower end portion upon impact of an object against the mat.

FIG. 1C is an example of how the leg members and the base footings may be connected. The base footings may be set to a defined angle, such that when the leg extension is connected, the rebounder is at a predefined angle, 45 degrees for example. Or the base may have an infinite adjustment capability by using a quick release mechanism such as those used for seat posts of bicycles, so that the leg extension is able to move or rotate to any angle within the arc of the device. Adjustment points may be placed in the leg extensions, permitting multiple angle settings for the rebounder surface, from vertical to less than a 20 degree angle from the floor surface or horizon. Lifters placed under the forelegs or legs not attached to the plyo-kit (FIG 21A) could be cup devices with rubber or other base material on the bottoms, which provide a gripping action to the ground surface, reducing slippage. They could also be made of a plastic or metal or rubber like material to accomplish the same result. Other versions may include leg extenders or attachments for the each rebounder leg that is connecting directing or indirectly to the ground surface. This will also permit portability, allowing for compact packing, and the ability to adjust the angle of the rebounding surface from complete vertical to complete horizontal. When a ball strikes the device shown in Figs 1A-1J, the rear support members are allowed to flex and give a little, which in turn minimizes floor creep despite heavy balls being thrown against it.

FIG. ID shows one example of how the leg attachment may be attached to the rebounder leg such that the leg extension may be adjusted to increase the length of the final support leg

(creating a more vertical rebounding surface), or, shortened, to move the rebounding surface to a more horizontal position, relative to the ground surface. It is understood, that many other methods of adjustment are available, such as holes allowing for spring loaded extensions that allow the leg to lock into different settings. Also, the base footings may be of different shapes or configurations which allow for a stable platform supporting the rebounder when it is set for plyometric use. Fig. IE is an isometric view of a plyometric accessory with an asymmetrical foot base. There is an extended end of the base, 107, and a short end of the base, 108. The base of the plyometric accessory may then be widened by rotating the asymmetrical unit which serves to increases stability when desired.

Fig. IF shows a rebounder with curved legs using a plyometric accessory. The plyometric connector, 104, can be installed in two different positions depending on which style leg is used. The wider setting is used for curved legs, 109. Fig. 1G shows a rebounder with straight legs using a plyometric accessory. Since the straight legs, 110, are not extended radially, they are closer together than the curved legs. For this to fit into the plyometric accessory base, the plyometric connectors, 104, need to be closer. This can be accomplished by installing them backwards.

Fig. 1H is a front view of a plyometric front support foot. Such an accessory may be included as an accessory that may be installed on a mini trampoline when it is configured for its plyometric function; and then removed when used as a rebounder for jumping. Fig. II is a side cross section view of a plyometric front support foot. As the plyometric accessory angle is changed, the front support foot will rotate. The front support foot has a curved base so it can provide support at all angles. Fig. 1J is a side view showing a plyometric front support foot attached to a rebounder, having a frame 101, tilted at an angle. FIG. 2A and FIG. 2B show another embodiment that includes tightening wires to add support to the plyometric device. The wires in FIG. 2A are placed in a "X" manner between the leg extensions. It is readily apparent that one or more supporting wires may be tensioned in ways not shown in the drawings, which may be tightened and tensioned to provide additional support for the structure. Supporting members other than wires may be used. The wires have the advantage of being extremely light and strong. But plastic or metal reinforcing members may also be used instead of tension wires. They may be otherwise attached or snapped onto the leg extensions, which would lend additional support to the structure for use as a plyometric rebounder. One example would be to have a foldable "X" frame of either plastic or metal, which attaches to the leg extensions or base members in a manner similar to that shown in FIG. 2A and FIG. 2B. The horizontal base rail shown resting on the floor in FIGS 1A, 2A, and 2B, may be any of several different lengths. FIGS 1A, 2A, and 2B show a horizontal base rail member with an approximate length equivalent to the distance between two of the rebounder legs. But it should be noted that the horizontal base rail member may be of a different length and/or adjustable. The rear members or horizontal base member(s) are not, however, attached to the front so that the structure may reverse flex against thrown objects so that ground creep of the device is

minimized. Thus, the rear support members that allow the rebound surface to be set in one or more angles for rebounding, are stiffened enough for plyometric use without the need of the purposefully extra rigid framing that has been typical in the past. FIG. 1C shows a system where the horizontal base member or footing is wider than the distance between the two rebounder legs. This will give increased lateral stability to the structure which helps reduce torque or frame twist which occurs due to the more open frame design. The base rail could also be made to be extended and contracted in a telescoping manner to make adjustments to the width. Also, widening the base rail would give more area for a sand bag or other weight to be placed upon the footing in order to add mass and stability if desired. But, as stated above, additional weight and mass was not required for a stable plyometric exercise rebounding device that can be used with weighted balls. Connection points could also be part of the leg extensions and footings to allow for attachment to an external object, such as a wall, a piece of furniture, or other object that would add stability and support if so desired. In another embodiment, symmetrical base footings of the type shown in FIG 1C, may instead be asymmetrical (FIG IE). An asymmetrical footing, where the footing extends further on one side of the attached leg than the distance the opposing edge extends from the opposite side of the same leg. This asymmetrical footing could be situated such that the edge that extends furthest (the long end) is pointed toward the inside of the opposing plyometric attachment and the other, or "short end" is pointing outward, away from the rebounder. This asymmetrical base or footing could then be rotated so that the longer edge is now pointed outward, away from the opposing plyometric attachment, and the short end points inward, which would extend the overall width of the horizontal base rail; providing increased lateral stability. Or, as previously described, the asymmetrical footing could be switched, so that the longer side is inside the leg extensions, resulting in a base rail that is the same approximate length as the distance between the two leg extensions. This allows for the base to be widened or narrowed as needed for optimum stability. Additionally, the foot can be slid along the floor pole to change width for various rebounders with different leg configurations.

A plyometric conversion accessory, referred sometimes herein as a "plyo-kit," can quickly be removed from the rebounder legs. At first it was predicted that it would be necessary to use a clamping device like a quick release to clamp the rebounder legs to the plyo-kit upright poles because of the extreme, harsh bouncing that occurs during use with weighted balls (FIG. ID). But, surprisingly, the legs do not jiggle apart or respond unsafely when they are not clamped and instead only attached by slip fitting the legs into the upright poles.

A handle system, as shown in FIGS. 4A, is a common feature or accessory of rebounders and mini trampolines. Handles provide additional support for users and allow for more types of exercises to be performed in conjunction with the benefits and exercises associated with jumping on the rebounder. The system of Fig. 8 includes an arched handle having two generally vertically extending uprights joined at the top by a cross member. As shown in Fig. 8 the uprights are coaxial with two of the legs of the frame and extend through collars mounted on the frame so that uprights can slide through the collars. To convert from a standard rebounder to a plyometric rebounder, one or more quick release clamps holding the handle assembly are released and the uprights are moved axially to an appropriate position where the uprights serve as member for supporting the frame such that the frame extends at an acute angle relative to the horizon as shown in FIGS. 4B-4C, and clamped in place. The handle assembly can be reversed in orientation, as shown in FIG. 4D, so that the cross member rests on the ground for added rigidity and traction. The handlebar thus is used to tilt the rebounder and the rebounding surface. The handle bar can be clamped to the legs at any location along its upright members or a smaller diameter internal pole can be extended from within the uprights that support the handlebar to tilt up the rebounder. Additionally, external poles could be used.

This system is advantageous in that it can be retrofitted to many styles of existing rebounders. FIGS. 5A-5B show a retrofitted rebounder. Two leg extensions, shown with base feet are attached to the existing rebounder thus converting it to a plyometric rebounder quickly and easily. The legs may be reinforced so that one inner member or leg is nested inside the external leg, such that their lengths are almost identical. This creates a double thickness of the legs, which provides additional stability when used in concert with base footings or pads, 105 and 107 (FIGS. 1C & IE). This capability is a significant improvement over prior art where the rebounder and plyo framing are part of one system only and not capable of being used with other products. The presently described design may include methods for adapting the plyo support members to rebounders not originally designed for the plyo rebounding purpose. Various methods of tightening, or the use of materials that fill the space between the rebounder leg and the plyo support member are envisioned; and can be made of rubber, ,foam, metal or plastic and the like. Also, the rebounder can be reinforced on the fore-end with additional framing which helps secure and strengthen a rebounder not originally designed as a plyo rebounding device. (See Figs. 17A-20D) A plyometric conversion accessory, referred sometimes herein as a "plyo-kit," can quickly be removed from the rebounder legs. At first it was predicted that it would be necessary to use a clamping device like a quick release to clamp the rebounder legs to the plyo-kit upright poles because of the extreme, harsh bouncing that occurs during use with weighted balls. But, surprisingly, the legs do not jiggle apart or respond unsafely when they are not clamped and instead only attached by slip fitting the legs into the upright poles. One version of the plyometric rebounder is to include the use of additional spring action to support and/ or enhance the plyometric effect when rebounding objects off of the device. The use of springs to enhance and improve the plyometric function of a rebounder is new to the art.

One method of spring enhancement is to utilize an air spring, the advantage of which is that air springs can be made to be very light weight compared to metal spring systems. Such a spring fits into the concept described herein regarding a lightweight, portable plyofit attachment, converting a small trampoline into a plyometric rebounder. Fig. 6A - 6E, show versions of the air spring plyometric rebounder tilted at approximately 45 degrees. Each of the two legs contains an air spring. This allows the legs to absorb energy from the rebounder mat on the down-bounce and retransmit it on the up-bounce. This both reduces stress on the plyometric feet and allows for a deeper, smoother bounce. Note that although an air spring is described, a gas spring or metal coil spring could be used in the same fashion. Fig. 6D is a side cross section view showing the inside of the air spring. Compressed air is filled into the cylinder through the air nozzle extending out from the upper part of the leg. There is a piston attached to the lower leg which compresses the air further as the upper leg slides along the lower leg (see 602-604). Fig. 6E is a side cross section view showing the air spring replaced with a coil spring. As the upper tube slides along the lower tube, the coil spring is compressed (604-606). It should be appreciated that spring or air piston function can be incorporated into or onto any framing support member whether horizontal, vertical, or at another angle.

Another option is to add a leaf spring type member to the legs, or attached as new legs, to a rebounder. Figs. 7A-C describes one such leaf spring plyometric rebounder design. The curved members, 703, are leaf springs designed to absorb and retransmit the load from the rebounder mat and are connected to the rebounder leg, 702. The leaf springs can be shaped and positioned in such ways as to affect how the rebounder behaves when struck by a ball or other such object. The leaf springs could rebound themselves in such a way as to assist in maintaining the position of the trampoline from moving while in use. The springs also add another dimension to the plyometric function; and can be set to either increase or decrease the rebound effect of objects impacting it. Another embodiment that is light weight and very portable, is to permit extended members to snap on or otherwise be attachable to an existing or standard mini trampoline. Figs. 8A-8E shows one such snap-on plyometric rebounder tilted at 45 degrees. Fig. 8C is a close-up view of the 4 snap-on components necessary to connect the plyometric legs to the rebounder. It comprises of two frame connectors and two leg connectors. The frame connectors, 805, attach to the end of the plyometric legs and snap onto the rebounder frame. The leg connectors, 803, rotate about the plyometric legs, and snap onto the rebounder legs. It should be apparent that the portable plyo-attachments could be placed at various positions or points on the length of the rebounder legs. Also, it should be noted that a different base or 'foot' to these members can be designed to accommodate the type of surface upon which the plyometric rebounder conversion will be utilized. If outside, the base members could be of a firmer tread for traction in outside conditions; or made of softer rubber like material, with more adhesive qualities for a smooth indoor surface, such as a hardwood floor or tile. Such foot pads can be shaped to act as a doorstop, so that the plyo-rebounder could be secured against a door in order to minimize movement of the plyo-rebounder during use.

Another embodiment would be to include an adjustable crossbar for the plyo members. Fig. 9A-9D shows one such adjustable crossbar plyometric rebounder (902, 903, 904, and 905). Fig. 9B is a side view of the adjustable crossbar plyometric rebounder tilted at 45 degrees. It should be observed that each crossbar consists of an inner and an outer tube, 904 and 905. These tubes are designed to slide apart, thus allowing them to tighten against the plyometric legs. In addition to adding rigidity and reducing vibration, this embodiment allows the plyometric legs to be used with rebounders of different sizes, and where various rebounders have different distances between legs. It is common that different manufacturers produce trampolines where the legs are various distances from each other. The presently described embodiment compensates for this and allows for retrofit upon rebounders that were never originally designed for the plyometric function. Nothing in the prior art performs this function for plyometric devices, as the concept had not yet existed prior to the presently described device. Many embodiments not shown can achieve this same result, and it should be noted that all such embodiments would necessarily need to duplicate the new and novel concepts described herein for these products. There are about three basic means for tightening the crossbars once they have been slid into place: threading, springs, and locking. The tubes could be threaded into each other such that turning one of them will expand or contract the crossbars until they are tight against the plyometric legs. The tubes could also be assembled with a spring designed to push them apart. The user would compress the spring in order to get the crossbar into place and then release them, allowing the spring to expand the crossbar and tighten against the plyometric legs. Finally, the crossbar tubes could be equipped with a locking mechanism such as a quick release. With the quick release open, the user could freely slide the crossbar tubes into place. Once placed, the user would close the quick release, tightening the tubes into place. The disclosed rebounder and its arrangements are also capable of adjusting the angle of the rebounding surface of the plyometric rebounder from zero to ninety degrees. Figs. 1 OA- IOC show one such example of a rebounder utilizing the portable arrangements presently described. There, a small attachment consisting of an angle joint, 1002, permits the rebounder to attain an angle of ninety degrees. Such an attachment could be coupled to any of the arrangements to achieve a greater angle than otherwise available. When the rebounder is set at ninety degrees, a portion of the round rail is likely to rest on or contact the ground surface. Figs. 1 OA- IOC each show a base 1004, that protects the rail and spring members from contacting the ground or floor surface, as well as, providing stability to the unit to prevent any wobble or side to side movement. Another arrangement could dispense with the shown base unit in favor of base attachments that would be connected to one or both of the forward rebounder legs. Such units would serve the same purpose as the shown arrangement.

The presently described system is a significant departure from what has been the standard design for plyometric rebounders previously available in the marketplace. The general lack of any true portability has prevented any meaningful duel use for both trainers and therapists who typically operate a concierge type business where they provide very personalized fitness, health, and nutritional services to their clients, and therefore frequently make house calls to these clients. The unexpected reduction of floor creep by changing the frame configurations used in the past, has resulted in a much more portable, flexible, and smaller plyo support members and framing.

These same benefits accrue to commercial gyms where business flexibility is gained by being able to move fitness equipment easily and readily allowing an open floor area to be adapted to multiple uses. Prior plyometric rebounders have cumbersome, all metal (often heavy or made to be heavy by the addition of weight plates, sand bags, etc.) floor structures that cannot be broken down for ease of portability. Another challenge of prior art is its poor flexibility at transitioning between a rebounder that may be moved around and used like a regular mini trampoline; and then used strictly as a plyometric device. The disclosed rebounder permits a dedicated rebounder, capable of supporting hard and heavy jumping by a full sized and athletic adult user, to be easily converted and/or retrofitted into a dedicated plyometric rebounder device, without compromising any functionality in each set up. Another method for a portable plyometric rebounder is to use inflatable members as either support members, or legs. Figs. 1 lA-11C is an example of one arrangement of the inflatable leg tube plyometric rebounder. Fig. 1 IB is a cross section side view of the inflatable leg tube plyometric rebounder. There are multiple sections or chambers, 1103, that may be inflated or deflated to change the length of the leg, and thereby alter the angle of the rebounder. It is also possible to create a leg tube similar to the arrangement shown out of a plastic or blow molded material, but with a smaller diameter. Almost any angle can be achieved in this arrangement. The inflatable members could have cylindrical holes arranged to accommodate the legs of the rebounder. These holes would be spaced at different heights along the inflatable allowing the rebounder to be set to different angles. In addition, the inflated leg members could have chambers that could be separately inflated and deflated to adjust the angle of the rebounder. (Approximate 30 degree angles are shown in the drawings.) A short or a full length ridged sleeve can be added to support the outside of the tube and ensure it keeps it shape. The short sleeve is used around one or more of the middle chambers that are deflated to maintain the tubes shape and rigidity. Instead of a short sleeve, a cap that is formed of metal, plastic, foam, or a rubberlike material and then shaped to accept or couple with the foot, leg or frame of the rebounder, or a combination of the three, could be arranged to fit tightly on the top of the inflated member and then one or more of the upper chambers could be deflated to change the height of the member and thereby change the tilt of the rebounder. It should be noted that the inflatable members can be of any shape sufficient to accommodate a rebounder and affect its angle. It could be inflated all-at-once or in stages. By inflating in stages, for example, from the bottom up, the user would only need to inflate to the height at which they wish to use the rebounder. The bottom of the inflatable could also be filled with sand, water, or another similarly dense substance to increase rigidity of the said inflated frame members during use. Additionally, the bottom of the members could include a surface material (rubber, for example) that increases grip on the floor surface, to limit slippage or movement during use. Coupled with the open tent or teepee frame design already described, a practical plyo device is created that avoids floor creep. An additional advantage of this arrangement is that the deflated leg members would be very compact, could be folded or rolled up, and be compactly stored and easily carried. A pump could be included to ease inflation, or a cartridge of some kind that injects air under pressure and is then disposable and inexpensive to replace. And, while the drawings show only one type of inflatable leg members, other arrangements would utilize inflatable bases (not shown) that would inflate into a structure filled with air. Such structures while still portable due to their ability to be inflated and deflated with air, could be of various and diverse shapes. An example of one such arrangement would be to utilize an inflatable pyramid type structure with a flat base and two angle sides ending at a terminus above. But instead of the extreme rigidity of the typical triangular type framing, the triangle of inflated material would be much more giving to again, reduce the problem of floor creep. Such members could be attached to leg members of a standard rebounder, and when inflated, extend such that the angle of the rebounding surface is moved and adjustable across a spectrum of angles most beneficial for plyometric exercises and activities. Holes could be placed along one or both sides that receive the legs of the rebounder. The angle of the rebounder could be adjusted depending upon which holes the legs are inserted. If adjustment holes for receiving a rebounder leg are placed on both sides, then one could attach two rebounders, one on each side of the pyramidal structure. This would permit two users to perform plyometric exercises at the same time in a reduced footprint. Such an arrangement would be useful in a commercial setting, where space is at a premium, and where group classes are envisioned. Additionally, two such inflatable pyramids could be set such that they angle towards each other. While not drawn, they would appear similar to the embodiment shown in Figs. 17A-17D. In this configuration, one or more users could place themselves between these plyometric rebounders and perform numerous therapeutic and training exercises.

Another inflatable member could resemble a curtain or wall, which may be inflated and connected to the rebounder frame or legs in some of several ways (Figs. 12A-12D). The inflatable curtain could contain a single inflatable chamber; or more likely, have several separate internal air chambers, 1203, which would provide additional stability and strength; as well as provide adjustability to the angle of the plyometric device. While Figs. 12A-12D show a curved inflatable curtain, other arrangements (not drawn) could embody a strait, rectangular curtain that would be secured between two legs of a rebounder. It could be attached to the frame, or each external edge of the curtain could have grooves into which the rebounder legs would be inserted or wedged, thus securing the plyometric device securely (not drawn).

Figs. 13A-13C shows a low profile base support member, 1303, that may be attached to various plyo attachments in lieu of the kind of base footings shown in Fig. 1C and Fig. IE. This flat base provides another method of stabilizing the plyometric rebounder and is an effective means of reducing drift or sliding of the unit during use, and when objects are rebounding off of the surface. It could be constructed of any material, advantageously a stiff rubber like mat, or plastic or nylon material with a grip surface to further assist the design to minimize slide or movement during plyometric exercises and movements; as well as to provide additional lateral stability for the unit. The legs of the rebounder closest to the floor surface may be modified to provide secure grip as the angle of the rebounder changes in its plyometric use. Again, this arrangement may be rolled, folded or arranged to slide into itself like a roll up or folded, to be readily stored away or placed in a carrying bag for transport. Another arrangement would be a single arm adjustment bar of the type shown in

Figs. l4A-14C. In this arrangement, a rigid bar plyo attachment, 1402, may be readily connected and disconnected to a regular rebounder. The bar would be adjustable in one of several ways. One way would be to have the bar nesting over a second bar, with holes placed along the length of the device. A pop pin could then engage in a hole, or pushed in so that the bar could be slid to a new angled position, where the pin would again pop into another hole, thus creating an adjustable device as to rebounder angle, from zero degrees, to over 45 degrees. Shock absorbing capability can also be included as described previously for Figs 6D and 6E. Additional plyo attachments of the kinds already shown could be added to allow the rebounder to move to an angle of approximately ninety degrees, if so desired (not shown). Again, the single arm adjustment bar could be hinged for folding, with or without detachable parts, so that it could be broken down for portability.

Another plyometric rebounder attachment would embody telescoping rebounder legs; or as separate telescoping plyo attachments. Figs. 15A-15D describes the first, where the legs of a one or more rebounder legs are able to telescope from a nesting position, 1502, such that the length of a member is extended to move the angle of the rebounding surface to one or more various angles for different types of plyometric rebounding exercise with medicine balls, or other objects. When in use as a rebounder, the plyo legs are completely nested and at the same height as the other rebounder legs. The strength of the leg would readily support a full sized adult user's jumping activity. Yet, when a plyometric function was desired, the plyo legs could be easily extended to convert the rebounder to plyometric use. Each leg segment could be locked into place to keep the length set where desired, thus securing various angles of the rebounder surface.

Examples of other telescoping products include that extending ladder, tripods, hiking sticks, extending painting poles, etc. The usual ways to lock the legs into various positions are with quick release cams or detents. The quick release cams have a lever which clamps down on the tubes when it is locked. The tubes are prevented from slipping by friction. Detents are pins which stick through holes through both tubes. One would push the pin inward so the outside tube is free to slide, and once it is in the right spot, the spring loaded pin pushes back out. Locks (like the cams) may be locked anywhere along the tube. The detent locks with mechanical stops can only be used in discreet locations where the holes line up.

In other arrangements, the plyo legs would not be part of an existing rebounder. This would be important if one wanted to retrofit a regular rebounder and convert it into a plyometric device. In such an arrangement (not shown), one or more nesting plyo extensions could be connected to each other and then attached to the rebounder frame, either at the rail or between two legs, without or with tightening adjustments permitting the plyo members or attachments to be securely connected to the rebounder.

Fig. 16A is a front view of a plyometric rebounder with an extreme stability kit. It is comprised of a rear crossbar, 1605,two base feet,1602, two upper tubes, 1606,and two lower tubes, 1607; and a middle cross bar, 1601,two base feet,1602, two upper tubes, 1603, and two lower tubes, 1604. This stability kit provides additional support when using a plyometric accessory. The middle crossbar attached to upper and lower tubes provide much greater lateral stability and overall strength of the device, with the additional tubes behaving like outriggers on a canoe, preventing or greatly minimizing: wobble and tipping when stressed in any way.

Fig.l6B is a side view of a plyometric rebounder with an extreme stability kit. The extreme stability kit provides a connection between the middle rebounder legs and the ground. This decreases the stress on the frame and leg studs because it distributes the load through the additional legs. It also provides support against the frame bending about the middle.

Additionally, it provides stability and reinforcement against wobbling or lateral movement caused by a strike nearer the edges or sides of the angled rebounder.

Fig.l6C is front angle view of a plyometric rebounder with an extreme stability kit. The angle of the rebounder can still be adjusted because there are multiple openings for multiple position settings on the lower tube, 1604. Fig.l6D is a front angle view of a plyometric rebounder with an extreme stability kit without a middle cross bar. This version of the kit omits the cross bar, 1601. This still provides contact between the middle legs and the ground, but the two middle legs are not connected by a crossbar, which may be acceptable for certain

applications. Although not shown, an embodiment may also be one where no crossbars are utilized, and therefore, the legs are not connected to the other horizontally. As described in this disclosure, no rigidifying framing is connected from the rear members toward the forward members closest to the rebounder rail section or from any horizontal base member directly to the rebounder rail section, so as to permit the rebounder to flex back from impacts to reduce total frame movement across the floor surface.

Figs. 17A-20D shows additional reinforcement to a rebounder configured as a plyometric device. When weight is placed against the rebound surface, it primarily directed downward in a vertical direction. If a user were to sit or step onto an angled plyometric rebound surface, the force is generated vertically in the downward direction towards the floor surface. This vertical pressure places additional stress on to the forelegs of an angled rebounder. Because the forelegs are situated at an angle due to the plyometric configuration, the increased downward force of an object or step serves to apply additional pressure where the forelegs no longer benefit from the increased strength afforded when vertically upright. By reinforcing the forelegs with additional support, they are better able to withstand this asymmetric pressure in the angled position. See Fig.l6B, element no. 1601, where the vertical orientation of the support is shown which provides reinforcement against the previously described downward energy. While not always needed, such reinforcement is useful where a user intends to jump, step, sit on the angled rebound surface, or when throwing extra heavily weighted balls or the like.

Fig.17 A is an angled view of a plyometric rebounder with a front support base. This system is comprised of a rebounder, 1705, a plyometric accessory, 1704, an extreme plyometric middle support, 1703, two front step blocks, 1701, and a top support adapter, 1702. The front support base provides extra strength in the front which allows users to use heavier weight devices with the unit. Fig.17B is a side view of the rebounder set at a 45 degree tilt. The front support base lifts the front legs off the ground while the middle, 1703, and rear, 1704, supports still touch. The front legs experience a bending moment when there is a vertical load on the front of the trampoline, 1705, so this support base is capable of withstanding much higher vertical loads.

Fig.l7C is a side view of the rebounder set at a 30 degree tilt. The front legs are still held off the ground by the front support base. This drawing shows the front support base made of two step blocks, 1701, and one top support adapter, 1702, but more or less step blocks could be used if they were different sizes. Step blocks are also used for aerobic exercise, where users step up and down off of similar platforms. Also, such step platform devices are stackable in layers to adjust the difficulty by adding or reducing the height of a user's step distance. An advantage of the support base described is that it can double as an aerobic step device, as well as a support base for the plyometric rebounder. The center groove shown in 1702 is one that be added to provide multiple grooves that adjust the angle of the plyometric rebounder. If additional smaller step blocks were used, you could remove blocks to adjust the height so that the front legs are always just barely off the floor no matter what tilt angle you are using. Also, grooves supporting the rail could also be placed opposite each other such that two plyometric configured rebounders could be set so that their jump surfaces face each other (not drawn). Also, the step support could be configured to have vertical grooves shaped into the edge of the steps to accommodate the forelegs of the plyometric rebounder that are adjacent to the step support. Such a configuration keeps any portion of the step support from being situated under the rebounder rebound surface, while still allowing the base to support the rail inserted or resting against the groove. Fig.l7D is an isometric exploded view of the front support base. The step blocks, 170 lean also be used on their own as step platforms for other exercises. There are existing step blocks in the market that could be used with our top support adapter, 1702. The step blocks and adapter stack on top of each other to create a platform of the necessary height to support the trampoline. It should be noted that the groove can also be configure so that the rail or tubes "snap" into the groove because the opening is slightly smaller than diameter of the tube.

Fig. 18A is an isometric view of a plyometric rebounder with dual front support reinforcement legs. Some uses of the plyometric device may be more severe than usual, or a user may desire the additional support provided by reinforcing the area where downward force may be brought to bear by a heavier ball or object thrown down on the plyometric device. Or, additional support may be desired for users that may sit or place pressure with their feet or hands against the device while it is in plyometric mode. The two support legs, 1801, attach to the rebounder, 1802, using snap on connectors. 1804 is a leg snap connector, and 1805 is a frame snap connector. Fig. 18B is a side view of a plyometric rebounder with dual front support legs. The reinforcement support legs, 1801, provide vertical support and reduce the bending moment on the trampoline front legs. Fig. l8C is a front view of a plyometric rebounder with dual front reinforcement support legs. The benefit of having support legs out next to the front legs is they are wide enough that you may not need middle support legs attached to the rebounder, 1802. The support legs, 1801 are placed on the inside of the rebounder legs so that they do not slide out of place because they are constrained by the rebounder legs.

Fig. 19A is an isometric view of a plyometric rebounder with a single front support. This T shaped support tube, 1901, connects to the rebounder frame and two front rebounder legs with snap on connectors, 1904. The benefit of this design is that it may readily utilize the same connector parts for each snap location and the support tube is tightly constrained by having three snap locations. Fig. 19B is a side view of a plyometric rebounder with a single front support. Fig.

19C is a front view of a plyometric rebounder with a single front support. Fig. 19D is an isometric view of a single front support with connectors.

Fig. 20A is an isometric view of a plyometric rebounder with a single front support. An advantage of this configuration is its simplicity, portability, and compact convenience. It contains a support base, 2007 (Fig. 20D), with a diameter sufficient to minimize the chance of tipping; especially when the securing mechanisms, 2004 and 2005, are tightened. The front support, 2001, supports the trampoline, 2002, when the trampoline is tilted up with the plyometric accessory, 2003. Fig. 20B is a side view of a plyometric rebounder with a single front support where the rebound surface is tilted at 45 degrees. Fig. 20C is a side view of a plyometric rebounder with a single front support where the rebounder surface is tilted at 30 degrees. The front support can pivot and also adjust in height, so it can support the trampoline at different degrees of angle. Fig. 20D shows the front support unattached to a plyometric rebounder. The top knob, 2004, is used to tighten the frame clamp. The pivot knob, 2005, is used to tighten the pivot joint depending on the angle you have set. 2006 is a threaded connection for raising and lowering the support clamp.

Fig. 21 A is a plyometric rebounder accessory taken apart and stacked for transport that shows this newly added benefit and convenience available to trainers, home users, and commercial businesses. The plyometric accessory shown in Fig. 5A and 5B is broken down into two extension legs, 2101, and one base assembly, 2102. Fig. 21B shows the small carry back that the plyometric accessory fits into when it is broken down. Fig. 21C shows a front view of the plyometric rebounder accessory carry bag. It is 640 mm long, or 25.2 inches. Fig. 21D is a side view of the plyometric rebounder accessory carry bag. It is 120 mm tall and 150 mm wide. That is equal to 4.75 inches tall and 6 inches wide. Additionally, and for all of the embodiments suggested or described herein, the use of gaskets or other barriers could be placed between the plyo parts and the rebounder frame connection points to provide vibration dampening, or in other cases, to remove unwanted dampening. The material used, and placement, would assist in either way. Another way of affecting dampening of the trampoline during plyometric use would be to inject foam or other material into the hollow members such as framing or the plyo members themselves. One way to accomplish this would be to inject the foam like material under pressure through a tube section or rail. Another would be to attach a string or cord like material to a nozzle where it could be 'snaked' and or backed out through the tube, being pulled at a set rate while foam was released into the hollow areas. Additional dampening could be accomplished similarly at the feet or base of the plyo members.

The presently described system is the first device that allows for portable functionality that allows the device to be used anywhere flat, as opposed to needing to be set against a wall, or burdened with a rigid frame structure with triangular attachments or with the need for additional weights, sand bags or the like to stop floor creep. The additional benefit has been greatly improved portability because of the much reduced framing requirement of the support members. The items are smaller and better compacted to a small area for easy storage and transport in a much smaller package.

In view of the many possible embodiments to which the principles of the disclosed invention may be applied, it should be recognized that the illustrated embodiments are only preferred examples of the invention and should not be taken as limiting the scope of the invention. Rather, the scope of the invention is defined by the following claims. We therefore claim as our invention all that comes within the scope and spirit of these claims.