The object of the present invention is a training device for high-intensity training of hip flexors while simultaneously training the extensors of the hip and knee joints.

Known from CN87213595U is a leg training device used to increase running speed, consisting mainly of a crane frame, a lower frame welded to an L-shaped body, a belt pulley system, a weight applying system, a steel wire rope, an ankle strap, a leg and foot strap, a meter, etc. The steel wire rope passes through the belt pulley and weight systems, and both ends of the steel wire rope are connected to the ankle strap or leg and foot strap to provide the necessary pull resistance during training. Athletes use two hands to hold the armrests, and the ankle strap or the leg and foot strap is tied, so that athletes can continue their leg swing or leg press training. The training device implements a specific feature, a specific amount and positioning of athletes' training and can increase the running speed.

Document EP0411082 discloses a leg training device used to increase running speed and consisting generally of a portal frame, a lower frame welded to an L-shaped body, a belt pulley system, a weight applying system, a steel wire rope, an ankle strap, a leg strap, a meter etc. The steel wire rope passes through the belt pulley and weight applying systems, and both ends of the steel wire rope are connected to the ankle strap or the leg and feet strap to provide the necessary pull resistance during training. Athletes use their hands to hold the handles, the ankle strap or the foot strap is tied and subsequently, users can begin their leg training.

US2014088466 discloses an invention relating to a device and process for rehabilitating a knee of a person before and after operations or injuries that affect knee mobility, such as partial or full knee replacement or hip replacement. The knee rehabilitation device allows a patient to perform bending exercises with active support, passive or progressive resistance, and to perform knee extensions and straightening exercises. A device with foot-mounted elements is placed in rails on the base and is intended for reciprocal movement and passive bending of the knee along the axis of the base. Resistance is provided by resistance lines connected at both ends of the base and attached to a cradle. The cradle can be arranged in any position to perform knee extension exercises. The foot of a patient is fixed to the cradle using straps and the leg strap holds the upper thigh of the patient in proper alignment relative to the device. Some commercially available technical solutions provide re-education of the hip joint flexion and extension (in the form of exoskeletons, machines for channelling the movement direction and tables with a sliding motion installation) as well as fitness-style leg training devices, the design of which is based on bindings with low weights mounted to them, e.g. in the form of dumbbells or weight applying profiles.

The disclosed prior art does not solve the problem of convenient and stable fixing of weights to the foot of a user that provides high comfort of use and secure hold of the weight attached to the foot of the user while simultaneously providing the ability to regulate the weight quickly and providing the required limb movement. These problems have not been effectively solved in the prior art mentioned above.

The object of the present invention is to provide a novel and improved device for training and rehabilitation that provides easy, quick and, most importantly, precise assembly of the weight and its application to the foot of the user.

The installation described herein aims to facilitate training using a novel approach to the issue of muscle balance in lower limbs and pelvic girdle. This balance corresponds to the stabilization of posture (including elements relating to the control of pelvic tilt and pelvic torsion and, secondarily, to the depth of spine curvatures and relating to motor abilities, such as balance).

The subject of the present invention is a leg training device comprising a support frame with a resistance mechanism and connectors affixed to the resistance mechanism and connected to foot fixings, characterised in that the foot fixing has cushions, a profile washer and bindings, wherein each foot fixing is connected to the resistance mechanism separately, at the same time the foot fixing comprises a flat platform, wherein a rear wall is secured to the top side of the platform, and the bottom of the platform is fixed to connectors guiding the platform by pulling it up in a near-vertical direction.

Preferably, the support frame is connected to foot fixings using connectors, wherein the connector is an elongated profile with the foot fixing pinned on the first side and shaped bushings on the second side, which are hingedly secured using rod bushings to the support frame with a weight spindle thereon. Also preferably, the support frame includes connectors in the shape of gradually bent profiles with foot fixings, wherein the connectors are connected to the resistance mechanism using a ratchet system and secured to the support frame by a shaft shared with the resistance mechanism.

Also preferably, the resistance mechanism is a magnetic system that has a wheel with a magnetic module that fixes the magnet assembly with a variable distance from the wheel that is adjustable using a pulley block system and a tie -rod system suspended in the support frame.

Preferably, the resistance mechanism is supported by a magnetic module embedded in a shaft and placed in the support frame.

Preferably, the resistance mechanism is an electromagnetic system that has a wheel with a magnetic module that fixes the electromagnetic assembly, wherein the force of the electromagnetic field is regulated using electromagnets suspended in the support frame.

It is also preferred that the support frame comprises a base and a column, wherein the base has side beams, a front beam, a middle beam, and a landing mounted on the base, a profile arrangement with crossbars and guide rollers with a pulley block system with a tie-rod guided on the pulley block system, wherein the tie -rod is affixed on its both ends to the bottom side of foot fixings.

It is preferred that the tie -rod is coupled with the weight of the resistance mechanism installed in the column by the pulley block system and by passing through the pulley block system of the ballasting system.

Preferably, the weight of the resistance mechanism has a regulating system and guiding profiles.

Also preferably, a lever with a side profile of the ballasting system coupled to a limiting module that limits the range of movement of the lever is provided at the base.

Preferably, the resistance mechanism is a mechanism having pistons with piston rods.

Preferably, the frame is connected to foot fixings using connectors, wherein the connector is a longitudinal profile with a foot fixing attached on the proximal side, and with shaped bushings on the distal side, the bushings being hingedly secured to the frame via frame bushings, wherein a distal end of the piston with a piston rod is hingedly fixed to the upper part of the frame, and the proximal end of the piston with a piston rod is hingedly fixed to the connectors in a proximal part thereof, adjacent to the foot fixings.

Preferably, the resistance mechanism is a mechanism that comprises springs. Preferably, the resistance mechanism is arranged in a frame in the form of a housing with a lid and perforated sheet metals and fixing profiles placed inside, wherein the resistance mechanism comprises springs in the form of spiral springs that are coaxially embedded together with drums, wherein connectors in the form of tie -rods are affixed to the drums and free ends of the tie -rod connectors are affixed to feet fixings.

Preferably, the resistance mechanism comprising springs has a resistance control system.

Preferably, the resistance control system comprises a motor with an adjusting knob.

Advantageously, the resistance mechanism comprises springs with dividers, with springs located on axes with drive sprockets, with adjusting sprockets, with sprockets, with adjusting springs and with cogged guides, wherein these elements cooperate with the drive shaft sprockets coming out of the motor equipped with the adjusting knob and constitute the resistance adjustment system.

It is also preferred that the foot fixings on the top side of the platform have a semi-circular wall, an anti-slip overlay, and binding holes are formed in the wall.

Also preferably, the stationary elements of the frame are connected by welding, and the movable elements are connected by screw coupling, and the shafts are mounted on a bearing.

It is also preferred that the frame elements have protective and anti-slip rubber coating.

Preferably, the ratchet system is used to transfer the resistance; and the ratchet system is located on the axis.

Also preferably, the solution is an installation that is part of a novel approach to the issue of muscle balance in lower limbs and pelvic girdle. This balance corresponds to the stabilization of posture (including elements relating to the control of pelvic tilt and pelvic torsion and, secondarily, to the depth of spine curvatures and relating to motor abilities, such as balance). Thus, it allows to create a training situation in which the muscles group of hip flexors (mainly muscles: iliopsoas, tensor fasciae latae, gluteus minimus, gluteus medius) are subjected to a high-intensity strength training with simultaneous training of the muscles of hip and knee extensors (mainly muscles: gluteus maximus, piriformis, gemelli, internal obturator, quadratus femoris, vastus) as stabilizing muscles. The key issues are the position of the body and its support during training, as well as the intensity of training stimulation allowing to build a complex movement pattern responsible for reducing morphofunctional disproportions within the muscle groups that are crucial for stabilisation. Preferably, in the leg training device, the weight application is designed so that the centre of gravity of the load, i.e. the resistance mechanism, i.e. the point of force application is at the axis of the tibia.

The advantage of the invention is that it enables quick and safe mounting of the weight to a foot as well as comfortable usage by using cushions as well as profiles and non-slip inserts. One advantage is also the ability to adjust the weight quickly and smoothly using the frame structure, which enables the execution of exercise and rehabilitation.

The leg training device according to the invention is shown in the figures of the drawing, in which Figure 1 and Figure la show a perspective view of the device in an embodiment with free weights, Figure 2 and Figure 2a is a perspective view of the device in an embodiment with a magnetic wheel. Figure 3, Figure 3a, and Figure 3b show a perspective view of the device in an embodiment with a stationary weight in the form of a weight column with a tie -rod system, Figure 4 and Figure 4a show a perspective view of the device in an embodiment with pistons and piston rods, Figure 5 and Figure 5a show a perspective view of the device in an embodiment with spring resistance, Figure 6 shows a perspective view of the foot fixing.

The solution according to embodiments comprises two essential parts: the first part is a foot fixing system 48 connected by means of connectors 500 to the second part, which is a system of resistance mechanisms 100 that provides the application of force of appropriate magnitude, direction, and sense. Resistance mechanisms 100 provide a sufficiently large force in a near-vertical direction and with essentially downward sense are shown. The foot fixing system 48 has a rigid platform 10 that provides a three -point foot support, adjustable fasteners for adjusting the bindings 7a, 7b to the girth of feet, and upholstered yoke elements in the form of cushions 4, 6, a profile washer 5 arranged so that the cushion 4 located at the rear is above the heel, and the cushion 6 and the profile washer 5 located at the front are evenly located on the instep, near the ankle joint, wherein the profile washer 5 is a rigid element that transfers the load from the bindings 7a, 7b evenly onto the instep through the cushioning upholstery. An anti-slip overlay 20 is placed on the top side of platform 10 and a rear wall 30 is secured to the top side of platform 10. The rear wall 30 has a substantially semi-circular U-shape that matches the envelope of the rear part of platform 10. In the rear wall 30, lower holes for bindings 7b are formed on the longitudinal lower protrusions, and upper holes for bindings 7a are formed above. The foot fixing 48 having the platform 10 with the rear wall 30 and the profile washer 5 is made of metal. In alternative embodiments, they are made of a strong material or a composite. The rear wall 30 and the profile washer 5 located in the upper part above the foot are upholstered and the foot is held by the cushion 4 located in the rear part of the foot fixing 48, respectively, and the cushion 6 is present in the upper part. The outer shape of cushion 4 corresponds to the rear wall 30, and the shape of the cushion 6 corresponds externally to the shape of the profile washer 5. The inner sides of cushions 4, 6 correspond to the foot shape. Bindings 7a, 7b with their fasteners are fixed to the rear wall 30. In an alternative embodiment, bindings may be in the form of belts, tie-rods, or chains. Bindings 7a, 7b are attached to the upper and lower holes on the rear profile, respectively. In the upper part of the profile washer 5, there are guides for bindings 7a, 7b. The profile washer 5 is movably connected to the bindings 7a, 7b. When fastening the bindings 7a, 7b, the foot fixing 48 is immobilized by a snug fit of cushions 4, 6 to feet, as shown in Figure 4. In an alternative version, the foot fixing 48 has one binding 7b.

In the leg training device, the load application is designed so that the centre of gravity of the load, i.e. the resistance mechanism 100, i.e. the point of application of force is at the axis of the tibia.

In a first embodiment of the leg training device, a system based on the free weights of the resistance mechanism 100 is shown, as shown in Figure 1 and Figure la. The system of the embodiment comprises a support frame 200. The support frame 200 is connected to foot fixings 48 using connectors 500 that are hingedly secured using bushings 110, 111, 112 of the support frame 200, said support frame 200 having a weight spindle 19 of the resistance mechanism 100 in the form of training plates. The support frame 200 has support profiles 14, 15. The support profiles 14, 15 are connected at one end to a transversely aligned rotary axis 113 that is shared by the support frame 200 and connectors 500. The rotary axis 113 comprises an inner profile of the bushing 110 with lateral outer profiles of the axis bushing 111 provided thereon that have a rubber cover of the bushing 112 with a shock-absorbing, anti-slip and spacing function. All profiles of the support frame 200 and connectors 500 having a distal end with transverse bushings 110, 111, 112 are combined with the rotary axis 113 using a bearing. Two inner beams in the form of profiles form connectors 500. Their shape is in the proximal part, to which the foot fixings 48 are applied, adapted to the spacing of legs of an athlete, and then, by a sequence of two creases narrowing the spacing, it assumes a spacing that reduces the distance of the profiles of connectors 500 from the centre of gravity of the weight set of the resistance mechanism 100. Foot fixings 48 are fixed directly to the proximal ends of support profiles of connectors 500. In this bottom area, profiles of connectors 500 are provided with a cushioning rubber cover 13. The support frame 200 includes outer profiles 14 that stabilise the support frame 200. The support frame 200 further comprises two transverse beams, namely an upper beam 16 and a lower beam 17, and two side beams 15 secured diagonally to the ends of outer profiles 14, thereby forming their extension. The lower beam 17 is at the height of the profile 14 and the side beams 15 bond, and the upper beam 16 is at the ends of side beams 15. A cushioning rubber cover 18 is provided on the bottom plane of the lower beam 17. A weight spindle 19 is fixed to the upper beam 16. In an alternative embodiment not illustrated in the drawing, the support frame 200 may also be horizontal and may comprise profiles forming connectors 500 with the beam 16 fixed to its top side with the weight spindle 19 set vertically upwards. In an alternative embodiment not illustrated in the figure but apparent to the person skilled in the art, the beam 16 may be in the form of a platform. This embodiment implements a solution in which the weight of the resistance mechanism 100 from the plates is transferred by the support frame 200 to connectors 500 with foot fixings 48, the plates being the most popular form of free loads used in strength training. The installation adapted to the standardized weights is more versatile and reduces purchase costs. The support frame 200 with the weight spindle 19 for the plates is located between the feet of the athlete and the rotary axis 113, which generates a downward force transferred to foot fixings 48 through the profiles of connectors 500. The support frame 200 is inclined, and in an alternative embodiment not illustrated, it is horizontal, as is apparent to a person skilled in the art. The inclination of the support frame 200 allows the weight of the resistance mechanism 100 to be shifted as far as possible in the direction of the athlete in order to apply the weight of the resistance mechanism 100 more effectively by increasing the moment of force.

Another embodiment shows a variant of the device, as shown in Figure 2 and Figure 2a. The embodiment implements a magnetic system, wherein the system includes analogous connectors 500 in the shape of gradually bent profiles 22a, 22b with foot fixings 48 as described above, and the support frame 200 in the form of a cage with an adjustable resistance mechanism 100 based on magnetic or electromagnetic braking.

In the leg training device, the load application is designed so that the centre of gravity of the load, i.e. the resistance mechanism 100, i.e. the point of force application is at the axis of the tibia.

The support frame 200 has a rectangularly shaped side frame 25 with a truncated top corner and a series of crossbars connecting them, such as the upper beam 28, the front beam 29 and the rear beam 210. The lower profiles 231 of the side frames 25 perform a supporting function and are provided with rubber covers 26a, 26b with cushioning and stabilizing function.

The resistance mechanism 100 shown in the example, as shown in Figure 2, comprises a wide wheel 220 and fixed magnet assembly 221 secured thereon using a magnetic module frame 222, with its distance from the wheel 220 adjustable by a tie -rod system 227, and a ratchet system 24 to move the wheel 220 by the movement of connectors 500. The wheel 220 is formed to comprise a component of material comprising a steel alloy to interact with the magnet assembly 221, wherein the wheel 220 in the embodiment is made entirely of steel. In alternative embodiments it can include a steel ring. The profiles’ axis of rotation of connectors 500 and wheel 220 is a shaft 211 that connects rear vertical profiles of the support frame 200. Each of the two profiles of connectors 500 connects with the shaft 211 using a bearing 217 recessed into the bushing 218 provided in the connector 500 at an end thereof located next to the wheel 220. The ends of connectors 500 to which the foot fixings 48 are fixed have a cushioning rubber cover 23. From the inner side of the support frame 200, the outer side of the profile of the connector 500 is separated by a spacing divider 216. Wheel 220 is secured on shaft 211 using bearing 219. The arrangement of wheel 220 with the magnetic module frame 222 fixing the magnet assembly 221 with a variable distance from the wheel 220 is regulated using a pulley block system 226, 228, 229 and a tie-rod system 227 suspended in the support frame 200. The magnetic system of the resistance mechanism 100 is supported on the bottom side by a magnetic module frame 222 having an arm 222a with an opening embedded on a shaft 212 located in the support frame 200 between the side frames 25.

The wheel 220 is widened in the peripheral portion. On the inside of the extension, the wheel 220 is serrated in a way that corresponds to the ratchet system 24 located on the profiles of connectors 500. The ratchet system 24 is provided so that resistance is only generated by lifting a leg positioned in a foot fixing 48 coupled with the connector 500. The magnetic mechanism of the resistance mechanism 100 includes a magnetic module frame 222 having a shape similar to that of the wheel 220, provided with an arm 222a, and a pulley block fixing system of the tie -rod system 227. The tie-rod system 227 includes a lower pulley block system 226, a wire rope 227a, a pulley block 228 of the tie -rod system 227, and an upper pulley block system 229. A magnet assembly 221 fixed by side profiles 223 is provided inside the fixing magnetic module frame 222 that fixes the magnet assembly 221 of the resistance mechanism 100. The arm 222a of the magnetic module frame 222 has at its end a bushing 224 with a bearing 225 allowing the magnetic module frame 222 to rotate relative to the axis defined by the shaft 212. Shaft 212 is embedded on profiles of the support frame 200. The profiles of connectors 500 having the shape of gradually bent profiles 22a, 22b with foot fixings 48 pass above the shaft 212 of the resistance mechanism 100.

In the support frame 200, the resistance mechanism 100 from the upper, top side of the magnetic module frame 222 is suspended using a lower pulley block system 226 of the tie -rod system 227 for adjusting the resistance, that is, the distance of the magnetic module frame 222 from the wheel 220, and using an upper pulley block system 229 located on the shaft 213 of the tie -rod system 227, wherein the shaft 213 is located between the diagonal profiles of side frames 25 of the support frame 200, below the upper beam 28 of the support frame 200. Below the shaft 213, between the oblique beams of side frames 25, there is a shaft 214 of the pulley block 228 of the tie-rod system 227, on which there is a drum 228 provided on one side with a sprocket wheel 228a that corresponds to a smaller sprocket wheel 215a formed on the shaft 215 of an adjusting crank 27. The shaft 215 is located below the shaft 214 of the pulley block 228 and, when recessed into the side frame 25, has the adjusting crank 27 at the end of the right side of the side frame 25. A wire rope 227a, which is a tie-rod in the tie-rod system 227, is wound onto the pulley block 228 during adjustment by rotating the adjusting crank 27 and continues to pass through the two pulley block systems 226 and 229 several times.

An alternative embodiment that is not illustrated but apparent to a person skilled in the art includes the use of an electromagnetic system, in which the force of the magnetic field is variable and based on adjustable electromagnets. In alternative embodiments, the distance between the magnet assembly and the wheel 220 may also be electrically adjustable using a motor driving the wound tie -rod shaft or in an alternative embodiment using a chain.

The resistance mechanism 100 is an exemplary magnetic resistance system shown in a schematic manner. Its construction has been simplified but it will be understood by a person skilled in the art.

Another embodiment shows a variant of the device, as shown in Figure 3, Figure 3a, and Figure 3b. The embodiment implements a system of previous embodiments comprising foot fixings 48, connectors 500, the support frame 200, and the resistance mechanism 100. In the leg training device, the load application is designed so that the centre of gravity of the load, i.e. the resistance mechanism 100, i.e. the point of application of force is at the axis of the tibia.

The resistance mechanism 100 is based on a commonly used stationary weight system in the form of the column 333 with weight stock and a tie-rod system that includes the tie -rod 310 and the pulley block system 37, 314, 331. The tie -rod 310 is single and both ends are fixed at the right and left foot fixing 48, respectively. As a result, the upward movement of one foot presses down the fixing 48 of the other foot of the user and prevents movement of the connector 500 connected to it during the exercise. The design of the column 333 is shown schematically in Figure 3 as a simple example of this type of solution. In this variant of the embodiment, force is applied to foot fixings 48 using profiles 312 that fix the tie-rod 310 being one of the elements of connectors 500. In the profiles 312, there are spindles with spacers 313, so that the position of the end loop of the tie-rod 310 is unchanged. The tie -rod 310 is a wire rope. Profiles 312 are shaped in such a way that they correspond to support profiles 311a, 311b in the form of obliquely arranged crossbars positioned on the support frame 200.

The support frame 200 comprises a base 332, wherein the base 332 comprises side beams 32, a front beam 34, a middle beam 35 and a landing 33 mounted on the base 332. Both beams, front 34 and middle 35, function as support and have a suitable rubber cover 36a, 36b. In front of support profiles 31 la, 31 lb, on the side beams 32 of the base 332 of the support frame 200, there is the landing 33 in the form of a rectangular platform. Below said support profiles 311a, 311b, there are two ledges forming crossbars 38 on which pairs of guide rollers 39, holding the position of the tie-rod 310 within the limit of lateral deflections below the support profiles 311a, 311b, are arranged. From the guide rollers 39, the wire rope of the tie-rod 310 passes through the pulley blocks 37 secured on the middle beam 35 and, by changing the direction, passes at the top through the pulley blocks 314 of the ballasting system 319 to the column 333 of the resistance mechanism 100. The ballasting system 319 comprises a lever 319a with a limiting module 320, crossbars 318, attached to the lower part of the lever 319a, in the form of longitudinal L-shaped profiles, with a first side profile 317a at its end, located at the profile of the side beam 32 of the support frame 200, and at the same time at the second side beam 32 profile, there is a second symmetrical side profile 317b and a system of shafts 315, 316 connecting them, on which the profiles of the ballasting system 319 rotate relative to the support frame 200. On the main shaft 315 of the ballasting system 319, which is located between the distal ends of the side profiles 317a, 317b of the ballasting system 319, there are pulley blocks 314 on which the tie -rod 310 rotates. The other two rollers are side shafts 316, which bearingly connect the proximal ends of side profiles 317a, 317b of the ballasting system 319 with side beams 32 of the base 332 of the support frame 200 to form a transverse axis of rotation. The ballasting system also has a limiting module 320 that limits the movement range of the lever 319a located on the right side beam 32 of the support frame 200. The C-shaped limiting module 320 provides only two stable positions for the lever 319a. The distal position of the lever 319a is when the lever 319a is directed towards the column 333 of the resistance mechanism 100, thereby causing strain relief of the tierod 310. The proximal position is when the lever 319a is directed to the user performing an exercise, causing tension on the tie -rod 310 and weighing down the resistance mechanism 100. The weight column 333 is connected to the support frame 200 using a transverse lower beam 321 of the column 333, wherein, due to its supporting nature, it has lateral rubber covers 36c. The frame-shaped column 333 also has two side beams 322 of profiles, an upper beam 323, an upper crossbar 324, and a lower crossbar 325, which includes a cushioning 325a for the weight stack 326. A weight stack 326 of the resistance mechanism 100 is located on the lower crossbar 325. Between the upper crossbar 324 and the lower crossbar 325, there are two guiding profiles 328 of the resistance mechanism 100, in the present embodiment in the form of tubes, however, in the alternative embodiment there may be a different cross-sectional shape of the guiding profiles 328, which will be understood by the person skilled in the art, as well as the use of different shapes of the profiles specified in the device. The tie -rod 310 runs inside guiding profiles 328. In the weight stack 326 of the resistance mechanism 100, there is provided a perforated ledge 327a and a spindle 327b with a knob comprising together a load regulation system 327 of the weight stack 326 of the resistance mechanism 100.

The tie-rod 310 attached to the foot fixing 48 passes through the pulley block system 37 and successively through the pulley block system 314 of the ballasting system 319, then enters the column 333 through the bottom pulley block system 331, passes vertically through the guiding profile 328 of the weight stack 326, passes through the top pulley block system 330 located on the bottom side of the transverse upper beam 323 and returns on the central pulley block 329 fixed to the perforated ledge 327a that binds the weight stack 326, then the tie -rod 310 returns sequentially through the top pulley block system 330 to the bottom pulley block system 331, sequentially onto the pulley block system 314 of the ballasting system 319, through the pulley block system 37, connecting at its end with the second foot fixing 48 on the opposite side. The ballasting lever 319a of the ballasting system 319 is used to reduce the backlash in the initial phase of the foot lift movement. The tie -rod 310 is connected by its ends to foot fixings 48 by means of spindles placed in profiles 312 of a shape corresponding to two inclined support profiles 311a, 311b in the form of diagonally arranged crossbars placed on the support frame 200, which are a direct support base for foot fixings 48. It is essential that the tie -rod 310 is directionally stabilized by pulley block systems 37, 314, 329, 330, 331 at the stage of entry between support profiles 311a, 311b as well as at all locations of direction change. For a person skilled in the art, it will be possible to use foot fixings 48 with a base for profiles 312, which in alternative embodiments will be conical, round, domed, or flat, and it is important that the return path of the foot fixing 48 to the base is as unequivocal as possible in the final section and prevents twisting or shifting of the foot fixing 48 relative to the socket formed for the ends of connectors 500 by mutually arranging support profiles 311a, 311b.

In a further embodiment of the leg training device, a system based on a piston resistance mechanism 100 is shown, as shown in Figure 4 and Figure 4a. This example includes foot fixings 48, connectors 500, support frame 200, and resistance mechanism 100.

In the leg training device, the load application is designed so that the centre of gravity of the load, i.e. the resistance mechanism 100, i.e. the point of application of force is at the axis of the tibia.

The arrangement comprises a support frame 200. The support frame 200 is connected to foot fixings 48 via connectors 500 that are hingedly secured using bushings 410 of the support frame 200, wherein the support frame 200 is provided with a resistance mechanism 100 comprising pistons 480 with piston rods 481. The support frame 200 includes lower beams 420 and side beams 430 connected by transversely arranged upper crossbar 440 and lower crossbar 450. The profiles of lower beams 420 of the support frame 200 and connectors 500, having transverse bushing sleeves 411 at their distal end, are bearingly connected to a common rotary axis. Foot fixings 48 are fixed directly to the proximal ends of support profiles of connectors 500. In this bottom area, profiles of connectors 500 are provided with a cushioning rubber cover 460. The lower crossbar 450 of the support frame 200 is attached on the bottom side to lower beams 420 at a proximal portion thereof, where the lower beams 420 connect with the side beams 430. The upper crossbar 440 is located at the top of side beams 430. The upper hinge fixings 490 of the piston resistance mechanism 100 are fixed to the upper crossbar 440. The pistons 480 constituting the piston resistance mechanism 100 are fixed with their distal end to the upper crossbar 440 of the support frame 200 and with the proximal end of piston rods 481 of the resistance mechanism 100 to the connectors 500, on which, at a proximal portion near the foot fixings 48, there are suitable hinged fixings 470.

This embodiment implements a solution in which the resistance from the resistance mechanism 100 is transferred from pistons 480 mounted on the support frame 200 and piston rods 481 using connectors 500 with foot fixings 48. The axis of rotation of the bushing 411 is spaced from the foot fixings 48, and the piston resistance mechanism 100 is located between the bushing 411 axis and foot fixings 48, thereby generating a downward force transferred to foot fixings 48 via profiles of connectors 500.

Another embodiment shows a variant of the device, as shown in Figure 5 and Figure 5a, comprising foot fixings 48, connectors 500, the support frame 200, and the resistance mechanism 100.

The leg training device is designed to apply a load so that the centre of gravity of the load, i.e. the resistance mechanism 100, i.e. the point of force application is at the axis of the tibia.

The resistance mechanism 100 is based on a spring-loaded mechanism comprising a series of spiral springs 510 arranged coaxially with the drums 511, with each drum 511 having a connectors 500 in a form of tie-rod that connects the spring-loaded resistance mechanism 100 to foot fixings 48. The tie rods of connectors 500 are wire ropes wound onto drums 511. The structure of the resistance mechanism 100 comprising springs 510 is shown in Figure 5 and 5a as an example of this type of solution. The resistance mechanism 100 including springs 510 has a resistance control system driven by the motor 521. Springs 510 are attached externally to the housing 512 and internally to sprockets 513 and are separated by spacers 514 placed on rings. The housings 512 of springs 510 are attached by means of fixing profiles 515 to the support frame 200 in the form of a sheet metal housing 201 and perforated sheet metals 202 fixed to the support frame 200. Inside the sheet metal housing 201 constituting the support frame 200, perforated sheet metals 205 are provided at the proximal and distal walls and perforated sheet metals 206 at the side walls. The force from the springs 510 is transferred to the connector 500 in the form of a tie-rod by means of a drive sprocket 516 conforming to the sprocket 511a formed in the drum 511 and the sprockets 513 of the springs 510. The adjusting sprocket 517 is conforming to sprockets 513 of springs 510 and stabilizing sprockets 202a disposed in the perforated sheet metal 202 behind the resistance mechanism 100 having the springs 510, and is disposed on a common axis 518 with the drive sprocket 516. The position of the drive sprocket 516 and the adjusting sprocket 517 is adjusted by the cogged guide 519 on the proximal side and the adjusting spring 520 on the distal side. The cogged guide 519 conforms to sprockets 522a provided on the drive shaft 522 connected to the motor 521. All axes have mounted bearings 525.

Spacers 514 are provided on rings, the rings being an integral part of spacers 514 and having a diameter that allows them to slide freely over the adjusting sprocket 517 and the drive sprocket 516. The adjusting sprocket 517 and the drive sprocket 516 have a similar cross-section and are aligned with sprockets 513 of the springs 510 in such a way that if the drive sprocket 516 is located inside the sprocket 513 of the spring 510, it transfers the torque generated during the deflection of the spring 510 by the rotational movement of the drive sprocket 516 located on the axis. If the adjusting sprocket 517 is located in the sprocket 513 of the spring 510, it prevents the spring 510 from unfolding while maintaining its base resistance via the sprocket 202a in the perforated sheet metal 202 located behind the housing 512 of springs 510. The rings in spacers 514 are spacers allowing for a given margin of error, a room for manoeuvre in the adjustment system, because they do not have a sprocket-like cross-section and are a point where the stationary (rotationally relative to the axis) adjusting sprocket 517 and the rotationally movable drive sprocket 516 meet. The cogged guide 519 is moved along the axis using transverse strips, and therefore the position of the point of contact between the drive sprocket 516 and the adjusting sprocket 517 is changed. This point can take the following positions: between the drum 511 and the first spring 510, under the spacer ring 514 between the first and second springs 510, under the spacer ring 514 between the second and third springs 510, under the spacer ring 514 between the third and fourth springs 510, or between the fourth spring 510 and the sprocket 202a located in the perforated sheet metal 202 behind the spring housing 512 of the springs 510. The cogged guide 519 is displaced using a drive shaft 522 driven by the motor 521.

The support frame 200 in the form of a sheet metal housing 201 comprises a lid 203 perforated at the points where tie-rods of connectors 500 pass, as well as the top rubber cover 204a, 204b at the points of contact with the foot fixings 48. In the further portion of the support frame 200 in the form of a sheet metal housing 201, there is the adjusting knob 523 connected to the motor 521 using an electric cable 524.

The present invention is not limited to the embodiments shown above. It can be modified and expanded within the appended claims without departing from the nature of the invention.