Field of technology

The invention concerns a mean of transport which moves by bouncing of the feet and has a seat for sitting. The invention has light construction, comfortable seating, it is easily composed (folded) and decomposed (unfolded) and it creates a conditions for energetically effective bouncing or propulsion. The mean of transport occupies a small space after it is composed into a portable position.

Prior state of the art

There are all sorts of folding or collapsible bicycles where the bicycle frame can be closed after locking off, which shortens the transport length of the bicycle. The mechanism which allows the folding of the frame has to be capable of carrying the mechanical load during the cycling and it cannot spontaneously open. Despite the number of known technical solutions, folding bicycles remain complicated, heavy and their folding and unfolding is more protracted the higher degree of the spatial compression into the portable position they entail. Scooters are used for the transport in the cities; these are usually lighter and they take less space. The small spatial demands of the scooters are related to the smaller wheels which are not propelled by the gear, since the scooter is propelled only by a bounce of a single foot. The second foot is kept by the rider on the platform of the scooter. Typical scooter lacks a seat, which causes an early fatigue on the part of the rider. The foldable scooters have a front head with the steering connected to the platform through the stud, which allows changing the geometry of the scooter. After the folding, the scooter can be inserted to the oblong casing. Bouncing of a single foot presents a significant performance loss compared to the pedaling on the bicycle. The scooter is therefore appropriate mainly for short distances, or as a toy.

There are efforts to combine the advantage of a scooter and a bicycle visible in multiple patent publications. DE19514028A1 discloses a scooter with a seat. With the given geometry of the scooter, however, the bouncing during seating is very uncomfortable and the frame of the scooter with the seatpost distributes the mechanical load unsuitably. The composition of this scooter is protracted. These deficiencies are partially solved by the arrangement according to CN201694325U, where the front head as well as the tube with the adjustable seatpost are foldable. The height of the seat as well as the overall geometry only lead to highly uncomfortable sitting, which prevents the effective bouncing of the feet. This solution is complicated and folding and unfolding is slow.

l Publication CN202686639U discloses a scooter combined with a bicycle, which has a demountable triangle frame and pedals with the gear on the back wheel. The placement of the pedals in the back, under the level of the seat, causes problems during the pedaling; the bouncing is not very comfortable, too. The construction in the portable folded state is heavy and too space-consuming.

Publication WO2004/005123 discloses a construction of the folding bicycle which is A- shaped and to which a console with the seat is attached in multiple realizations. According to figures 3 to 7, the seat is placed on the console, which absorbs the force reaction of the opening of the legs. The seat is loaded from the direction of the seat to fold and during the composition to the inactive state the seat gets to the level of the handle-bars, which increases the length in the inactive state. The setting of the height of the seat is in steps; for example, according to figures 4 and 5a the seat is set by a set of openings and studs, therefore it is difficult to choose the right height of the seat for the comfortable bouncing by the feet. The construction with the slidable stud and bearing (figures 3b, 5a) is complicated and both hands have to be used to fold the bicycle according to each version of WO2004/005123.

The height of the seat has to be gradually adjustable if a bouncing of the feet is to be used as propulsion. Such solution is desired and not known, which will be simple, which will be the least space-consuming in the folded space, and which will allow comfortable and energetically effective propulsion by bouncing of the feet.

Essence of the invention

Abovementioned deficiencies are significantly remedied by a collapsible wheeled mean of transport propelled by the bouncing of the feet, which has at least two wheels and a frame with a head, where the front wheel is carried by the crotch, which is rotationally placed in the head and which is connected with the handle-bars for the control of the direction of riding, whereby the frame has at least one stud for the folding or composition of the frame, and the mean of transport includes a seat designed for the sitting of the person during the bouncing of the feet according to this invention which essence lies in the fact that the head of the frame has a first stud in the upper part, through which the head is foldingly connected with the back stand. On the lower part of the back stand there is a rear wheel. Below the first stud in the head of the frame there is a second stud, on which the transom is tiltably placed. At the end of the transom there is a seat; on the transom between the end of the seat and the end connected in the second stud there is produced a stop capturing the opening of the back stand, whereby a clutch runs from the transom, whereby this clutch is adjusted by its second end to be demountably connected and disconnected with the head and/or the first stud and/or the back stand. The basis of the construction of the frame in the active state has geometry of the letter A. The front stand in the head of the frame together with the back stand produce the legs of the letter A; the transom is - as if - a horizontal middle line in the letter A; in most constructions the transom will be sloped by its back part upwards. This geometry is significantly effective in order to achieve the desired height of the sitting. Various means of transport in the state of the art minimalize the space needed for the transport in such a way that the individual components are diminished, which leads to the uncomfortable sitting and difficult, hindered control. The proposed invention is characterized by the fact that the person sitting on the mean of transport is in the upright position - that is, in the position that is similar to position during walking. Geometry with letter A is very appropriate for these matters; the front and back stand are mutually connected by the upper stud which represents an axis of the folding and unfolding of the frame. During the transfer of the weight of the rider the opening of the legs of the letter A takes place - that is, the opening of the front and back stand. This opening is captured by the stop in the transom. The transom is held in the correct position by the clutch. In such kinematic scheme the individual parts - transom, clutch and head - are loaded by the pressure or pull, and bending load takes place. Only the stands are bending loaded; with small deviation of the stands from the vertical the bending load is small, too.

The transom represents a kinematically most preferable capturing of the force reaction from the weight of the rider. The weight operates as arrestment of the open position of the front and back stand; it is not necessary to screw or otherwisely secure the joint, as known from the other collapsible frames of the bicycles. The kinematic nodal point (or joint) between the transom and the back stand is easily separable after standing up; the absence of the weight or load on the seat releases the joint and it is not necessary to manually decompose or otherwisely release the joint. The transom is adjusted for releasing and downward movement; that is, it folds downward to the inactive position, and is not lifted upwards; this brings considerable advantage resulting from the low transport height in the inactive position. The solution WO2004/005123 in the prior state of the art uses a transom moving upwards, which increases the height of the device in the inactive state.

The transom is adjusted for the releasing downwards in such a way that it avoids the back stand during the movement, so that the back stand and transom do not angularly interfere with each other when folded to the vertical, mutually almost parallel position. The transom can consist mainly from two flat profiles which run on the sides of the back stand, where the flat profiles are connected by the stop.

It is preferable if the transom has a U-profiled zone and other U-shaped zone profiled in opposite direction, whereby the cavities in the U-shaped profile are designed to receive the body of the back stand. In order to allow the folding of the transom downwards, the profile of the transom in the front part - that is, between the head and the stop - oriented as letter U; in the rear part - that is, between the stop and the mounting of the seat - it is oriented as letter U upside down (Π). Such profile can be produced from rectangular and originally closed aluminum profile, whereby in the first zone of this profile only a single wall is removed, which changes the closed profile to U-shaped profile, and in the other zone the U-shaped profile is produced similarly on the side opposite to the first zone. The stop in form of an opening is between these two zones. When folding the transom downwards to the inactive, portable position, the pipe of the back stand is hidden inside the U-shaped profiles; the width of the transom does not increase the transversal dimension of the frame in the portable position.

The geometry of the frame of the mean of transport itself - with the clutch - according to this invention brings about synergetic effect. The stands transfer the weight from the seat in a spatially effective way; the composition through a single stud is sufficient to change the geometry; and in the active position the transom with the stop delimits the mutual position of the front and rear stand. The clutch running from the transom is produced in such a way that in the active position it is connected to the first stud, or to the upper end of the front stand, respectively, which is in this place connected to the first stud. This creates a force triangle between the first stud, second stud and the end of the transom with the clutch; this force triangle is effective for capturing the opening moment which is created from the weight of the rider. The advantageous course of the forces and moments leads to simple construction of the frame.

The clutch running from the transom is in the preferable arrangement constructionally connected with the seat; alternatively, the seat is itself a clutch or at least part of the clutch. Usually the bicycle seats have supporting skids which allow the setting of the movement of the seat back and forth. These skids are solid enough, they are dimensioned for the folding on the basis of the weight of the cyclist and they can therefore transfer the pull in the triangle formed from: upper stud, lower stud and the end of the transom. Such realization is possible where the body of the seat - without the skids - is used to transfer the forces. The body of the seat is sufficiently solid and strong; aside from the vertical weight load it can carry or transfer the pull forces in the horizontal direction. An existing type of the seat - appropriately adjusted - can be used, or a new seat with the respective connecting elements can be used. The seat in this arrangement in the close proximity to the head - which leads to the spatially economic construction - has been shown as having no negative effect on the comfort of the ride.

The seat should be in the height which corresponds to the sitting of the rider in such a way the feet of the rider lightly touch the ground, so that the foot with its surface touches the ground without bending of the knee. Here the significant advantage compared to the scooter is manifest. During the standing on the scooter the rider bounces by one foot only, which leads to uneven weight load of the musculoskeletal system, and which also leads to 50% performance loss. In case of the mean of transport according to this invention the rider bounces by both feet, which corresponds better to the natural walking. The advantage against the walking is the use of inertia (persistence): the end of the process of a single bounce is not connected to the halting of the body, as is the case in case of the single step during walking. It suffices to lightly lift both feet and the mean of transport rolls by the inertia (persistence), or - alternatively - it decreases on the sloped plane.

The height of the seat is set in such a way that the rider does not make too much labor, that the rider does not have to stretch the tip of the foot in order to achieve the touch with the ground but - at the same time - that the leg is not in phase of the bounce bent too much in the knee. Such height of the seat brings about another advantage. The transition between the riding of the mean of transport and the walking is very fluid; the rider does not have to step over the frame as is the case in case of bicycle; even small raise is sufficient and the mean of transport can run forward from beneath the rider. Simple transition between riding and walking and vice versa is important, since the rider can therefore ride among the walking or standing people, for example in heavy city traffic, in pedestrian zone, and so on. The mean of transport occupies much smaller ground surface and does not interfere with the wheels to the personal space of surrounding people - and it does not obstruct them during hoping on or off.

Fast transition between the walking and riding is advantageous for the safety reasons, too. Fall from the bicycle is connected with the change of the position of the body of the cyclist; the cyclist cannot fluidly move from pedaling to walking, the frame of the bicycle and the pedals obstruct him. On the bicycle the seat is usually in the highest position, so that pedals do not touch the ground during the lower reversal point. In case of the impeding fall, the rider on the mean of transport according to this invention starts walking or running. The height of the seat will preferably correspond to the length of the leg of the rider with tolerance of ± the length of the foot. The length of the leg is a distance from the crotch to the ground in upright position of a person.

In order to set the correct height of the seat, the stands can be adjustable, for example telescopically. It is preferable if at least the front stand is adjustable. This can be achieved for example in such a way that the front stand is placed in the head not only rotationally, but also slidingly. The sliding is limited by the stop under the head in the pipe of the front stand. The stop can be produced as a clamping sleeve with quick screw. Setting the position of the clamping sleeve on the front stand sets the position of the lower lever of the head of the frame. By this, the position of the upper, first stud from the ground also rises or decreases. The weight from the head is transferred to the clamping sleeve and then on the front stand and the wheel.

A solution has shown to be very effective where the height of the seat is adjustable by the angle of the opening (distancing) of the front and back stand. It suffices that the clutch running from the transom is length-adjustable. The end of the clutch can be equipped by the screw; the head of the screw will fall into the groove in the pipe of the back stand on its end, where it is placed in the first stud.

In another arrangement the seat can be led and placed independently of the clutch. The clutch at the end of the transom can be directed not only upward to the first stud, but also downward from the end of the transom to the back stand, whereby it is connected to this stand below the level of the stop of the transom. In such case the clutch transfers pressure forces to the back stand.

Setting the length of the clutch achieves exact and fine setting of the height of the seat. The brute change of the height can be achieved by change of the length of the front stand below the level of the head of the frame.

In preferable arrangement, the stands will be produced from the pipes, for example from light metals or carbon fibers. The pipes from the carbon fibers are available as intermediate product, in various diameters and with various numbers of layers. A combination of these materials is possible. Mainly in the case where the transom is from metal - for example aluminum - and the back stand is from the material that is softer on the surface - for example carbon fibers - it is preferable when the surface reinforcement is placed in the place of the effect of the stop on the surface of the back stand. That reinforcement can be, for example, a part of the cylindrical surface of the metal pipe, which is glued onto the surface of the back stand. It will have sufficient length so that it reaches various positions of the bounce according to the various settings of the length of the clutch. The surface reinforcement increases the resistance of the back stand to abrasion and bruise in the place of the stop. Pursuant to needs, a carrying reinforcement of the front or back stand can be used in preferable arrangement; this reinforcement carrying the bending and pressure load. In order to achieve smooth outer surface, this reinforcement can be placed inside. In case of the back stand it is preferable if the carrying reinforcement runs through the zone of the effect of the stop. The carrying reinforcement can have various cross-section, it can be printed or flat or circular or rectangular pipe, for example from the light metal alloy, or it can be a solid rod from the hardwood, laminated bamboo, or the carrying reinforcement can have a changing cross- section pursuant to the course of the bending loads. In case the stands are produced from the carbon fibers, the stand can have a changing width of the wall according to the course of the bending loads. In case of any sort of carrying reinforcement it will be preferable if the outer surface of the stand is still smooth and straightforward; this ensures easy manipulation during folding and unfolding.

In order to improve the transfer of the force between the stop of the transom and the back stand, a solution with the tiltably placed socket can be used. The socket or half-socket freely wraps the back half of the circumference of the profile of the back stand. When folding the transom downwards, there is a mutual slidable movement between the socket and the back stand in the place of the stop. The socket is tiltably placed in the transom, preferably by means of two freely placed studs on the side of the transom. These studs are placed in the front and allow the rotation of the socket pursuant to the mutual angular position of the transom and the back stand. The socket transfers the force onto the back stand on the larger surface than the stop in the form of the opening in the transom does. The socket lowers the punctual load and at the same time it does not prevent the folding of the construction.

A socket tiltably attached from the front allows for simple cushioning of the mean of transport. The stop in form of the socket can hang on the arm, which creates certain freedom of movement between the transom and the back stand in the loaded state. Then it suffices in order to create cushioning that the clutch has a flexible, cushiony element. The flexible element can be produced by a metal spring or it can be a simple rubber bloc in the seat where the clutch is anchored.

In the active position the rider sits on the seat and holds the handle-bars by his hands, and bounces by the feet on the air. The rider brakes by pressing the feet on the ground, too. Braking can take place on one of the wheels or both wheels, too. After the taking off of the seat, the force bonds in the frame are release, the hinge join of the clutch can be simply taken out, which releases the position of the transom. The transom is folded upwards, whereby the back stand moves closer to the front stand. The body of the rear stand retracts to the U groove in the profile of the transom. The disclosed construction is preferable in the fact that the weight acting from the seat delimits all gaps in the studs and arrangements. Various gaps in the construction could be felt by the rider as unpleasant, disquieting and dangerous. Therefore the folding bicycles have a frame equipped by the clamping elements, for example screws, which define the gap in the hinge. In the proposed invention it is precisely the big advantage that the gaps are delimited in the geometry by the weight of the rider. Hopping off releases all tensions in the joints; the arrangement lacks clamping screws, in order to change the geometry of the frame a simple act suffices - disconnection of the clutch from the connection with the back stand. One hand holds the front part of the seat and then the clutch is pulled upward from the groove in the back of the back stand. In this position the mean of transport has a very compact form; it fits into the oblong casing or cover, similar to the bag for the golf sticks. The folding to the inactive portable position by a single hand is allowed by the geometry with the clutch; its release from the hinge joint and subsequent movement of the seat upward is easy and fast; it is not necessary to use the other hand.

In the preferable arrangement the mean of transport can be supplied by the electric engine. The electric engine is placed in the vicinity of the wheel which is propelled by means of a toothed belt. The electric accumulators with cylindrical outer shape can be placed in the stands. The mean of transport can have a shoulder strap by which it can be easily carried in the portable position. The mean of transport can also have a coupler which in portable position serves to hold the adjacent stands together. The coupler can have a form of a plastic clip to which the neighboring stand is snapped into.

The invention brings simple construction with quickly changeable geometry. In the portable state the mean of transport is easily storable; in active position the mean of transport is comfortable, effective, easy to mount onto and easy to hop off from.

Brief description of drawings

The invention is further disclosed by the means of the figures 1 to 15. The used scale and ratio of sizes of individual elements, the angle of the opening of a front and back stand, the shape of the handle bars and the shape of the seat do not have to correspond to the description in the examples and these scales and ratios cannot be interpreted as limiting the scope of protection. The particular profile of the used aluminum profiles is used only as an example, too.

Figure 1 depicts a mean of transport in the active state from the side view. Similarly, figure 2 also depicts the mean of transport in the active state intended for riding; here the view is axonometric, from above and from behind. Interrupted line in form of an arrow between the positions 10 and 9 shows the unfolding movement, which releases the geometry of the frame during the change into the portable position.

Figure 3 depicts the folding of the mean of transport into portable position; the release of the stop from the connection with the back stand is visible here.

Figure 4 is side view of the mean of transport in the portable position.

Figure 5 shows the part of the mean of transport in the active position from below; there the stop on the transom leans to the back stand. The clutch is inserted in the groove on the upper edge of the back stand, where a first stud is produced.

Figure 6 shows - from below - the release of the stop from the connection with the back stand during the folding to the portable position. A construction of the transom is visible, too; the transom is adjusted to receive the pipe of the back stand into its U-shaped profile.

The detail of the catching of the clutch in the groove and leaning of the stop in the transom to the surface reinforcement on the back stand is depicted on the figure 7. Here the free placement of the second stud in the two opposite openings is visible, too. Figure 8 depicts from above the release of the stop after the disconnection of the clutch from the hinge joint with the front stud. Same stage of the change of geometry is depicted on figure 9 from below.

Mean of transport in the portable position is depicted from above on the figure 10, and it is depicted in the same position from below on figure 1 1.

Figure 12 is a side view of the transom which is produced by the tiltably placed socket. In this view the transom is longitudinally cut so that the socket inside the profile of the transom is visible. Figure 13 is a view in the direction of the axis of the back stand which is at least from half covered by the socket.

Figure 14 depicts the lower part of the seat with the clutch which is placed in the rubber bloc. In this view the seat is surrounded from behind.

Figure 15 depicts an electric engine of the mean of transport; electric accumulators are not depicted.

Examples of realization

Example 1

In this example according to figures 1 to 11 the frame, the front stand 1, the back stand ^ the head 3 and the transom 7 are produced from aluminum profiles. The head 3 and the stands 1, 6 have circular, closed cross-section; the transom 7 is produced from rectangular profile. The front stand 1 is led in the head 3, where there is a head arrangement with roller bearings. Front stand runs through the head 3 upward, on the end the narrow handle-bars V\ are connected to the pipe of the front stand 1; the overall length of the handle-bars is less than 35 cm. In order to control the front wheel 2 with the low backward bend only small control force suffices, therefore narrow handle-bars V\_ suffice; these handle-bars V\_ do not have to be diminished during the folding to the portable position. At the lower end of the front stand there is a short crotch from two aluminum profiles. Both wheels 2 contain a pair of roller bearings and solid rubber tire. Front wheel 2 is carried by a crotch at the end of the front stand which is rotationally placed in the head 3 and connected with the handle-bars V\_ for control of the direction of the ride.

The studs 4, 5 are produced in the head 3. First, upper stud 4 below the handle-bars V\_ connects the head 3 with the back stand 6. The axis of the first stud 4 is designed in such a way that the back stand 6 in the portable position leans to the front stand The transom 7 is connected to the head 3 by means of the lower, second stud 5. The transom 7 in this example is produced from the rectangular and originally closed aluminum profile, whereby one of the walls from this profile is removed in the first zone, which produces a U-shape profile from the closed profile; in the second zone the U-shaped profile is similarly produced on the opposite side of the first zone. Between these two zones there is a stop 8 in form of the opening. This construction is preferable mainly for the fact that the folding of the transom 7 to the portable position the pipe of the back stand 6 hides inside the U-shape profiles; the width of the transom 7 does not increase the transversal dimension of the frame in the portable position. For this construction it is preferable if the transom 7 in the second stud 5 is attached through two free depositions, so that the preceding shaft of the second stud 5 does not hinder the slope of the back stand 6 to the front stand

The seat 9 is placed on the back end of the transom 7, whereby in the longitudinal direction the seat 9 forms a part of the clutch 10. The clutch 10 has a screw with the hexagonal head, which is screwed into the nut in the seat 9; this screw heads in the direction from the seat 9. This can set the overall length of the clutch 10; that is, the dimension between the front of the head of the screw and the attachment of the seat 9 in the transom 7. The hexagonal head at the end of the clutch 10 can be produced by the nut, preferably closed nut, which is screwed at the end of the threaded rod. The front end of the clutch 10 falls into the connection with the upper end of the back stand 6. In principle it is a connection with the first stud 4 and the head 3. On the figure 7 we see that this joint is simply solved by means of a groove 13 at the upper end of the back stand 6.

In order to fold the mean of transport to the portable position it is necessary that the rider hops off the seat 9 which releases the force effect in the frame. By moving upwards the grip of the end of the clutch 0 from the groove 13 on the upper end of the back stand 6 is released. This releasing movement is depicted on the figure 2 by an arrow. What follows is a release of the stop 8 from the touch with the back stand 6; during the lowering of the transom 7 downward the back stand 6 moves in the opening of the transom 7. This is depicted in detail on figures 6, 8 and 9. The back stand 6 moves closer to the front stand 1, too. In the final phase the pipe of the back stand is hidden in the U-shape profile of the transom 7.

A clamping sleeve below the lower end of the head 3 serves for the brute setting of the height of the seat 9, after its release by the quick screw the front stand 1 can by inserted or pulled out to the desired position. For fine setting of the height of the seat 9 a screw of the clutch 10 is used.

After the folding to the portable position the wheels 2 avoid each other in such a way that the front wheel 2 is rotated in the necessary degree.

A shoulder strap which can simplify the carrying in the portable form is attached to the frame (though not depicted on the drawings). The mean of transport in this example weighs less than 2,5 kg. Common bicycle weighs between 13 and 15 kg; special and expensive road bicycles weigh 6,8 kg (UCI limit). Collapsible scooters without the possibility of sitting weigh around 3 kg.

Example 2

In this example the pipes in the front stand 1_, back stand 6 and the head 3 are produced from carbon fibers.

On the back stand 6, in the zone where the stop 8 of the transom 7 makes effect, there is a surface metal reinforcement 12 which distributes the punctual load from the stop 8 on the surface of the back stand 6. The surface reinforcement 12 in this example is produced by cutting out from the aluminum pipe with the respective inner diameter. It is subsequently glued onto the carbon surface of the back stand 6.

Example 3

In this example the handle-bars V\_ are demountable. They are released from the front rack and thanks to this they do not increase the width of the overall body in the portable position.

Example 4

Back stand 6 has a carrying reinforcement in form of a pipe pressed on its inside; the diameter of the pipe corresponds to the inner diameter of the profile of the back stand 6. The carrying reinforcement runs through the zone of the touch of the stop 8.

Example 5

In this example according to figures 12 to 14 the mean of transport has a cushioning of the frame. The flexible element 15 is produced by the means of a bloc of rubber. The seat 9 forms a part of the clutch 0 in such a way that the carrying construction of the seat 9 - on which the soft coating is placed from above - transfers the pull load. Strap placed in the back in the stud of the transom 7 serves this purpose. The strap is shaped accordingly to the groundplan of the seat 9, it broadens at the back to the width of the transom 7 and narrows in the front, whereby it has an opening at the front end through which the rod forming the front part of the clutch 0 is running. The rod is also slidingly placed in the clasp attached to the seat 9 from below. The end of the rod below the seat 9 runs through the rubber block; it has a thread and it is equipped by the wing nut. The front part of the rod is designed to be locked to the groove on the back stand 6. During the sitting the rubber bloc is loaded by the pressure. The stop 8 on the transom 7 is formed by means of a socket 14 from the metal strip. The metal strip is U-shaped and bent according to the radius of the profile of the back stand 6. In the front part the metal strip is tiltably placed in two studs on the side racks of the transom 7. These studs are placed freely and outside the middle plane of the transom 7 so that they do not hinder the insertion or retraction of the back stand 6 inside the U-shaped of the profile 7. The metal strip of the socket 14 has a plastic coating so that the abrasion of the surface of the back stand 6 is avoided. During the load, the socket 14 is set to the angular position which corresponds to the actual position of the transom 7 against the back stand 6.

The co-effecting of the tiltably placed socket 14 and the flexible element 15 allows simple cushioning of the mean of transport.

Example 6

The mean of transport in this example has an electric engine according to the figure 15. The engine is propelling the wheel 2 by means of a toothed belt and guide pulley. The guide pulley increase the angle of the belting on the small pulley of the electric engine. The accumulators are cylindrical and they are placed inside the back stand 6.

Industrial applicability

Industrial applicability is obvious. According to this invention it is possible to industrially and repeatedly produce and use collapsible wheeled mean of transport which is propelled by the bouncing of the feat and - at the same time - has a seat for the comfortable sitting and it also has effective propulsion akin to walking.

List of related symbols - front stand

- wheel

- head

- first stud

- second stud

- back stand

- transom

- stop

- seat

0- clutch

1- handle-bars

2- surface reinforcement 3- groove

4- socket

5- flexible element6- electric engine