CN220608994U - Body warming leg pressing equipment for sports students - Google Patents

Abstract

The utility model relates to a warm-up leg pressing device for a gymnastics, which comprises a frame body, a supporting beam and leg pressing beams, wherein the frame body comprises two vertical beams, the lower ends of the vertical beams are respectively provided with a supporting seat, walking wheels are arranged in the supporting seats, a brake is arranged on the supporting seats, a cross beam is connected between the lower ends of the two vertical beams, the supporting beam is horizontally arranged between the two vertical beams, the two ends of the supporting beam are respectively connected with the two vertical beams in an up-down sliding manner, lifting mechanisms connected with the supporting beam are arranged on the vertical beams, leg supports are arranged at the upper ends of the supporting beam, brackets are assembled at the upper ends of the two vertical beams in a swinging manner, the leg pressing beams are horizontally assembled on the brackets, a rotary driving device connected with the brackets is assembled on the vertical beams, and the rotary driving device is used for driving the brackets to drive the leg pressing beams to rotate to one side or the upper side of the frame body. The advantages are that: structural design is reasonable, can be nimble regulation leg pressing's aperture size, uses more nimble to, can provide the better support of shank when the leg is pressed to the low-angle, the security is higher.

Description

A kind of warm-up leg press equipment for sports students

Technical field

The utility model relates to the technical field of sports equipment, in particular to a warm-up leg press equipment for sports students.

Background technique

No matter what kind of sports, you need to warm up and press your legs before exercising. Otherwise, you will easily strain your muscles during exercise. At this time, you will use warm-up leg press equipment. However, the previous leg press equipment is fixed and cannot be moved, and the height of the leg press cannot be adjusted. During the leg press process, standing on one leg may become unstable, leading to a fall, or the equipment is not fully fixed and is not safe enough.

Therefore, it is necessary to develop a leg press device that is safer and more flexible to use.

Utility model content

The technical problem to be solved by this utility model is to provide a warm-up leg press equipment for sports students, which effectively overcomes the defects of the existing technology.

The technical scheme of this utility model to solve the above technical problems is as follows:

A kind of warm-up leg-pressing equipment for physical education students, including a frame body, a support beam and a leg-pressing beam. The frame body includes two vertical beams. The lower ends of the above-mentioned vertical beams are respectively provided with support seats, and the above-mentioned support seats are provided with running wheels. The above-mentioned support base is provided with a brake, and a cross beam is connected between the lower ends of the two above-mentioned vertical beams. The above-mentioned support beam is horizontally arranged between the two above-mentioned vertical beams, and its two ends are respectively connected with the two above-mentioned vertical beams by sliding up and down. The vertical beams are provided with a lifting mechanism connected to the above-mentioned support beams. The upper ends of the above-mentioned support beams are provided with leg supports. The upper ends of the two above-mentioned vertical beams are swingably equipped with brackets. The above-mentioned leg pressure beams are horizontally assembled on the above-mentioned brackets. , The above-mentioned vertical beam is equipped with a rotational driving device connected to the above-mentioned bracket. The above-mentioned rotational driving device is used to drive the above-mentioned bracket to drive the above-mentioned leg press beam to rotate to one side or above the above-mentioned frame body.

On the basis of the above technical solution, the present utility model can also make the following improvements.

Furthermore, the upper end of the leg support is provided with an arc-shaped concave surface, and a soft cushion layer adapted to its shape is provided on the concave surface.

Furthermore, two positioning rods are spaced apart at the lower end of the leg support, and positioning sleeves corresponding to the positioning rods are vertically provided at the upper end of the support beam. The positioning rods are inserted into the corresponding positioning sleeves from top to bottom. In the barrel, the side end of the positioning rod has a screw hole transversely, the side end of the positioning sleeve is provided with a through hole corresponding to the screw hole, and a positioning bolt screwed with the screw hole is inserted through the through hole.

Furthermore, the sides of the two vertical beams that are close to each other are respectively provided with vertically extending assembly grooves. Both ends of the above-mentioned support beams are respectively embedded in the corresponding assembly grooves of the above-mentioned vertical beams and can move up and down relative to the above-mentioned assembly grooves.

Further, the above-mentioned lifting mechanism includes a first screw rod, a first guide rod and a first handwheel knob. The above-mentioned first screw rod is vertically rotatable and assembled in the assembly groove of one of the above-mentioned vertical beams. The lower end of the above-mentioned vertical beam is provided with The lower end of the first screw extends into the hollow area and is connected to the first handwheel knob. The first guide rod is vertically assembled in the assembly groove of another vertical beam. The support beam is A first nut seat is embedded inside one end, and the first nut seat is screwed on the first screw rod, and the other end of the support beam is nested on the first guide rod.

Furthermore, one side of the two vertical beams is respectively provided with a support rod perpendicular to the two, and one end of the above-mentioned support rod away from the above-mentioned vertical beam is respectively provided with a suction cup structure.

Further, the above-mentioned bracket includes two parallel-distributed straight-strip swing arms and a translation mechanism. The two above-mentioned swing arms are respectively located on the sides of the two above-mentioned vertical beams away from each other. One end of the two above-mentioned swing arms are respectively connected with the two above-mentioned The upper end of the vertical beam is rotationally connected, and the above-mentioned rotation drive device is assembled on any one of the above-mentioned vertical beams and is drivingly connected with the above-mentioned swing arm. The above-mentioned leg pressure beam is horizontally arranged between the two above-mentioned swing arms, and its two ends are connected to the two above-mentioned swing arms respectively. The above-mentioned swing arms are slidingly connected, the above-mentioned translation mechanism is connected with the above-mentioned leg press beam, and is used to drive the above-mentioned leg press beam to slide along the length direction of the above-mentioned swing arm. The above-mentioned rotation drive device is used to drive the two above-mentioned swing arms to flip to the horizontal position and One side of the above-mentioned vertical beam may be flipped vertically upward.

Furthermore, the sides of the two swing arms that are close to each other are provided with chute along their respective length directions, and the two ends of the above-mentioned leg press beam are respectively embedded in the chute of the two above-mentioned swing arms.

Further, the above-mentioned translation mechanism includes a second screw, a second guide rod and a second handwheel knob. The above-mentioned second screw is rotatably assembled in one of the above-mentioned slide grooves and extends along the length direction of the above-mentioned swing arm. The above-mentioned second screw The guide rod is assembled in another of the above-mentioned chute and extends along the length direction of the above-mentioned swing arm. One end of the above-mentioned leg pressure beam is embedded with a second nut seat, and the above-mentioned second nut seat is screwed on the above-mentioned second screw rod. The other end of the leg-pressing beam is nested on the second guide rod, and the second screw passes through one end of the swing arm away from the vertical beam and is connected to the second handwheel knob.

Furthermore, a protective side plate corresponding to the leg support is vertically installed on the side of the leg press beam close to the support beam.

The utility model has the following beneficial effects: it has a reasonable structural design, can flexibly adjust the opening of the leg press, is relatively flexible to use, and can provide better leg support when pressing the leg at a small angle, with high safety.

Description of the drawings

Figure 1 is a schematic structural diagram of the warm-up leg press equipment for sports students of the present invention.

Figure 2 is a schematic structural diagram of the leg support in the warm-up leg press equipment for sports students of the present invention.

Figure 3 is another usage diagram of the warm-up leg press equipment for sports students of the present invention.

In the drawings, the parts represented by each number are listed as follows:

1. Frame; 2. Support beam; 4. Bracket; 5. Rotary drive device; 6. Support rod; 7. Leg beam; 11. Vertical beam; 12. Support base; 13. Running wheel; 14. Cross beam; 21. Leg support; 22. Positioning sleeve; 31. First screw; 32. First guide rod; 23. First handwheel knob; 41. Swing arm; 71. Protective side plate; 111. Assembly slot; 121 , brake; 211, positioning rod; 212, positioning bolt; 421, chute.

Detailed ways

The principles and features of the present utility model are described below with reference to the accompanying drawings. The examples cited are only used to explain the utility model and are not intended to limit the scope of the utility model.

Embodiment: As shown in Figures 1, 2, and 3, the warm-up leg press equipment for sports students in this embodiment includes a frame 1, a support beam 2, and a leg press beam 7. The frame 1 includes two vertical beams 11. The lower ends of the vertical beams 11 are respectively provided with support seats 12. The above-mentioned support seats 12 are provided with running wheels 13. The above-mentioned support seats 12 are provided with brakes 121. A cross beam 14 is connected between the lower ends of the two above-mentioned vertical beams 11. The above-mentioned supports The beam 2 is horizontally arranged between the two vertical beams 11, and its two ends are respectively connected to the two vertical beams 11 by sliding up and down. The vertical beams 11 are provided with a lifting mechanism connected to the support beam 2. The support beam 2 The upper ends of the legs are provided with leg supports 21. The upper ends of the two vertical beams 11 are pivotably equipped with brackets 4. The above-mentioned leg pressure beams 7 are horizontally assembled on the above-mentioned brackets 4. The above-mentioned vertical beams 11 are equipped with the above-mentioned brackets 4. The connected rotary drive device 5 is used to drive the bracket 4 to drive the leg press beam 7 to rotate to one side or above the frame body 1 .

The warm-up leg press equipment for sports students in this embodiment is divided into two training methods:

1) Press the legs at a small angle, as follows:

The rotation drive device 5 drives the bracket 4 and the leg pressure beam 7 to rotate to one side of the frame body 1 so that the leg pressure beam 7 is located on one side of the frame body 1. After that, the height of the support beam 2 and the leg support 21 is adjusted through the lifting mechanism. (This height adjustment matches the user's height and leg length). After adjustment, the user's calf rests on the leg support 21 (or the two are just in contact, providing protection for the trainer's legs. When the trainer's feet The leg press beam 7 is suddenly dropped to provide support for the calf and prevent the trainer from falling and other unsafe accidents). At the same time, the trainer's soles are pedaling on the leg press beam 7, or the ankle is resting on the leg press beam 7, and then Just keep the leg pressing action. When evacuating, the feet first leave the leg pressing beam 7, the lower leg is supported by the leg support 21, and then slowly lower the leg. The leg press beam 7 can adjust the horizontal displacement according to the body position of the trainer.

2) Press the legs at a large angle, as follows:

The rotation drive device 5 drives the bracket 4 and the leg-pressing beam 7 to rotate until the leg-pressing beam 7 is located above the vertical beam 11 , and the trainer can tilt the legs upward and make the feet pedal on one side of the leg-pressing beam 7 above or By directly pressing the ankle on the leg pressing beam 7, a large angle leg pressing action can be achieved.

The entire device has a reasonable structure design, can flexibly adjust the opening of the leg press, is relatively flexible to use, and can provide better leg support when pressing the leg at a small angle, with high safety.

In this embodiment, the upper end of the leg support 21 is provided with an arc-shaped concave surface, and a soft cushion layer adapted to its shape is provided on the concave surface. The concave surface is designed to be an arc that matches the physiological curve of the human calf, making the support of the legs more comfortable. At the same time, the design of the soft cushion layer better improves the comfort during support.

As a preferred embodiment, as shown in Figure 2, two positioning rods 211 are provided at intervals at the lower end of the leg support 21, and the upper end of the support beam 2 is vertically provided with positioning rods corresponding to the positioning rods 211. Sleeve 22, the positioning rod 211 is inserted into the corresponding positioning sleeve 22 from top to bottom, the side end of the positioning rod 211 has a screw hole transversely, and the side end of the positioning sleeve 22 is provided with a screw hole corresponding to the screw hole. Through holes, positioning bolts 212 screwed with the screw holes are disposed in the through holes.

In the above embodiment, the leg support 21 and the support beam 2 are detachably assembled. During disassembly, only the positioning bolts 212 need to be loosened, making the operation easy and fast.

As a preferred embodiment, the sides of the two vertical beams 11 that are close to each other are respectively provided with vertically extending assembly grooves 111, and the two ends of the above-mentioned support beams 2 are respectively embedded in the corresponding assembly grooves 111 of the above-mentioned vertical beams 11. , and can move up and down relative to the above-mentioned assembly groove 111.

In the above embodiment, both ends of the vertical beam 11 are embedded in the assembly groove 111 of the vertical beam 11 and slide along the assembly groove 111. The structure of the two is relatively compact and the operation is stable.

Specifically, the above-mentioned lifting mechanism includes a first screw rod 31, a first guide rod 32 and a first handwheel knob 23. The above-mentioned first screw rod 31 is vertically rotatable and assembled in the assembly groove 111 of one of the above-mentioned vertical beams 11. The lower end of the above-mentioned vertical beam 11 is provided with a hollow area. The lower end of the above-mentioned first screw rod 31 extends into the hollow area and is connected with the above-mentioned first handwheel knob 23. The above-mentioned first guide rod 32 is vertically assembled on another one of the above-mentioned rods. In the assembly groove 111 of the vertical beam 11, one end of the above-mentioned support beam 2 is embedded with a first nut seat, which is screwed on the above-mentioned first screw rod 31, and the other end of the above-mentioned support beam 2 is nested in the above-mentioned first screw rod 31. on the first guide rod 32. By operating the first handwheel knob 23 to rotate, the first screw 31 can be driven to rotate, thereby driving the first nut to move up and down along the first screw 31, thereby realizing the up and down movement of the support beam 2 relative to the assembly groove 111. Structural design comparison It is reasonable, the operation is relatively stable, and the operation is relatively convenient and simple.

As a preferred embodiment, one side of the two vertical beams 11 is respectively provided with a support rod 6 perpendicular to the two vertical beams 11, and one end of the above-mentioned support rod 6 away from the above-mentioned vertical beam 11 is respectively provided with a suction cup structure.

In the above embodiment, the entire frame 1 can walk along the ground to the wall through the support base 12 and the running wheels 13, and the suction cup structure at the end of the strut 6 is adsorbed to the wall. At the same time, the brake 121 is operated to lock the running wheels. 13 brakes, so that the entire device can be stably fixed on specific parts for training. The brake 121 is an existing technology, and a conventional braking device for the wheel body can be used, and will not be described in detail here.

As a preferred embodiment, the above-mentioned bracket 4 includes two parallel straight-strip swing arms 41 and a translation mechanism. The two above-mentioned swing arms 41 are respectively located on the side away from the two above-mentioned vertical beams 11. One end of the above-mentioned swing arm 41 is rotatably connected to the upper ends of the two above-mentioned vertical beams 11 respectively. The above-mentioned rotation driving device 5 is assembled on any one of the above-mentioned vertical beams 11 and is transmission connected with the above-mentioned swing arm 41. The above-mentioned leg press beam 7 is horizontal It is arranged between the two swing arms 41, and its two ends are slidingly connected to the two swing arms 41 respectively. The translation mechanism is connected to the leg press beam 7 and is used to drive the leg press beam 7 along the direction of the swing arm 41. By sliding in the length direction, the rotary driving device 5 is used to drive the two swing arms 41 to flip horizontally and be located on one side of the vertical beam 11, or to flip vertically upward.

In the above embodiment, the bracket 4 uses two parallel swing arms 41, and its structure is very simple. At the same time, the leg press beam 7 can move along the length direction of the swing arms 41, thereby enabling flexible adjustment of the press according to trainers with different heights and leg lengths. The purpose of the displacement of the leg beam 7 is to make it more convenient and flexible to use.

In this embodiment, the sides of the two swing arms 41 that are close to each other are provided with chute 421 along their respective length directions, and the two ends of the leg press beam 7 are respectively embedded in the chute 421 of the two swing arms 41 . The structural cooperation between the leg press beam 7 and the swing arm 41 is more compact, so that the leg press beam 7 moves relatively smoothly relative to the swing arm 41.

In this embodiment, the above-mentioned translation mechanism includes a second screw (indicated by a in the figure), a second guide rod (not shown) and a second handwheel knob (indicated by b in the figure). The above-mentioned second screw is rotatable The second guide rod is assembled in one of the chute 421 and extends along the length direction of the swing arm 41. The second guide rod is assembled in the other chute 421 and extends along the length direction of the swing arm 41. The pressure leg A second nut seat is embedded inside one end of the beam 7. The second nut seat is screwed on the second screw. The other end of the leg pressure beam 7 is nested on the second guide rod. The second screw passes through One end of the swing arm 41 away from the vertical beam 11 is connected to the second handwheel knob. The translation mechanism refers to the structure of the lifting mechanism, is more convenient to operate, and moves the leg pressure beam 7 relatively smoothly.

As a preferred embodiment, a protective side plate 71 corresponding to the leg support 21 is vertically installed on the side of the leg press beam 7 close to the support beam 2 .

In the above embodiment, when the leg press beam 7 is rotated to one side of the frame 1, the trainer's feet step on or press the leg press beam 7 and lean against the side ends of the protective side plates 71 to limit the displacement of the legs. , to avoid unsafe accidents such as side slipping and falling due to incorrect movements, and to play a certain protective role.

In this embodiment, the rotation drive device 5 can use a conventional motor. One end of the two swing arms 41 is rotationally connected to the two vertical beams 11 through coaxially distributed shafts. The rotation drive device 5 can be connected to one of the shafts. .

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axis" The directions or positional relationships indicated by "radial direction", "circumferential direction", etc. are based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the device referred to. Or elements must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limitations on the invention.

In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically limited.

In this utility model, unless otherwise expressly stipulated and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. Connection, or integration; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an interaction between two elements, unless otherwise clear limits. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In the present invention, unless otherwise expressly stipulated and limited, the first feature "on" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in direct contact through an intermediate medium. indirect contact. Furthermore, the terms "above", "above" and "above" the first feature is above the second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "below" and "beneath" the first feature to the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature has a smaller horizontal height than the second feature.

In the description of this specification, reference to the terms "one embodiment," "some embodiments," "an example," "specific examples," or "some examples" or the like means that specific features are described in connection with the embodiment or example. , structures, materials or features are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification unless they are inconsistent with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above-mentioned embodiments are illustrative and cannot be construed as limitations of the present invention. Those of ordinary skill in the art are within the scope of the present invention. Changes, modifications, substitutions and variations may be made to the above-described embodiments.

Claims (10)

1. A sports student is with leg pressing equipment of getting warm, its characterized in that: including support body (1), supporting beam (2) and leg pressing roof beam (7), support body (1) include two vertical beams (11), the lower extreme of vertical beam (11) is equipped with supporting seat (12) respectively, be equipped with walking wheel (13) in supporting seat (12), be equipped with stopper (121) on supporting seat (12), two be connected with crossbeam (14) between the lower extreme of vertical beam (11), supporting beam (2) level set up two between vertical beam (11), its both ends respectively with two vertical beam (11) upper and lower sliding connection, be equipped with on vertical beam (11) with elevating system that supporting beam (2) are connected, the upper end of supporting beam (2) is equipped with shank support (21), two the upper end of vertical beam (11) can swing be equipped with support (4), leg pressing roof beam (7) level assemble in on support (4), be equipped with on vertical beam (11) with rotary device (5) that support (4) are connected, drive device (5) are used for pressing leg (4) to drive body (1) side of turning to one side.

2. A warm-up leg pressing apparatus for sports activities according to claim 1, wherein: the upper end of the leg support (21) is provided with an arc-shaped concave surface, and the concave surface is provided with a soft cushion layer which is matched with the shape of the concave surface.

3. A warm-up leg pressing apparatus for sports activities according to claim 1, wherein: the lower end of the leg support (21) is provided with two positioning rods (211), the upper end of the support beam (2) is vertically provided with positioning sleeves (22) corresponding to the positioning rods (211) one by one, the positioning rods (211) are inserted into the corresponding positioning sleeves (22) from top to bottom, the side ends of the positioning rods (211) are transversely provided with screw holes, the side ends of the positioning sleeves (22) are provided with through holes corresponding to the screw holes, and positioning bolts (212) screwed with the screw holes are penetrated in the through holes.

4. A warm-up leg pressing apparatus for sports activities according to claim 1, wherein: two vertical beams (11) are respectively provided with a vertically extending assembly groove (111) on one side close to each other, and two ends of the supporting beam (2) are respectively embedded into the corresponding assembly grooves (111) of the vertical beams (11) and can move up and down relative to the assembly grooves (111).

5. A warm-up leg pressing apparatus for sports activities according to claim 4, wherein: the lifting mechanism comprises a first screw rod (31), a first guide rod (32) and a first hand wheel knob (23), wherein the first screw rod (31) is vertically and rotatably assembled in an assembly groove (111) of one vertical beam (11), a hollowed-out area is formed in the lower end of the vertical beam (11), the lower end of the first screw rod (31) stretches into the hollowed-out area and is connected with the first hand wheel knob (23), the first guide rod (32) is vertically assembled in the other assembly groove (111) of the vertical beam (11), a first nut seat is embedded in one end of the supporting beam (2), the first nut seat is screwed on the first screw rod (31), and the other end of the supporting beam (2) is nested on the first guide rod (32).

6. A warm-up leg pressing apparatus for sports activities according to claim 1, wherein: one side of each vertical beam (11) is provided with a supporting rod (6) perpendicular to the two vertical beams, and one end, far away from each vertical beam (11), of each supporting rod (6) is provided with a sucker structure.

7. A warm-up leg pressing apparatus for sports activities according to claim 1, wherein: the support (4) comprises two parallel-distributed straight swing arms (41) and a translation mechanism, wherein the two swing arms (41) are respectively located at one sides of the vertical beams (11) which are far away from each other, one ends of the two swing arms (41) are respectively connected with the upper ends of the two vertical beams (11) in a rotating mode, the rotary driving device (5) is assembled on any one vertical beam (11) and is in transmission connection with the swing arms (41), the leg pressing beams (7) are horizontally arranged between the two swing arms (41), two ends of the leg pressing beams are respectively connected with the two swing arms (41) in a sliding mode, the translation mechanism is connected with the leg pressing beams (7) and used for driving the leg pressing beams (7) to slide along the length direction of the swing arms (41), and the rotary driving device (5) is used for driving the two swing arms (41) to be horizontally and located at one side of the vertical beams (11) or to vertically upwards overturn.

8. A warm-up leg pressing apparatus for sports activities according to claim 7, wherein: one side of each swing arm (41) close to each other is provided with a sliding groove (421) along the respective length direction, and two ends of the leg pressing beam (7) are respectively embedded into the sliding grooves (421) of the two swing arms (41).

9. A warm-up leg pressing apparatus for sports activities according to claim 8, wherein: the translation mechanism comprises a second screw rod, a second guide rod and a second hand wheel knob, wherein the second screw rod is rotatably assembled in one of the sliding grooves (421) and extends along the length direction of the swing arm (41), the second guide rod is assembled in the other sliding groove (421) and extends along the length direction of the swing arm (41), a second nut seat is embedded in one end of the leg pressing beam (7), the second nut seat is screwed on the second screw rod, the other end of the leg pressing beam (7) is nested on the second guide rod, and the second screw rod penetrates out of one end of the swing arm (41) away from the vertical beam (11) and is connected with the second hand wheel knob.

10. A warm-up leg pressing apparatus for sports activities according to claim 1, wherein: and one side of the leg pressing beam (7) close to the supporting beam (2) is vertically provided with protective side plates (71) which are in one-to-one correspondence with the leg supports (21).