Sitting and prone position leg training device

Abstract

The utility model discloses a sitting and prone position leg training device, which relates to the field of fitness equipment and adopts the technical scheme that the sitting and prone position leg training device comprises a main bracket serving as a supporting structure; the back cushion is rotationally connected with the main support, and a positioning structure capable of locking the rotating angle of the back cushion is arranged between the back cushion and the main support; the seat cushion is arranged in front of the back cushion, and the front part of the seat cushion is rotationally connected with the main bracket; the locking mechanism is connected with the main bracket and is arranged below the back cushion and the seat cushion; the moving part is arranged at the front end of the main bracket and is rotationally connected with the main bracket; the moving part can be driven by the legs of a user to swing. The utility model has the beneficial effects that the occupied space is extremely small, the shape can be changed according to the requirements of a user, the sitting posture state and the prone posture state can be switched through simple operation, and different requirements of the user on kicking and hooking legs are met.

Description

Technical Field

[0001] The utility model relates to the field of fitness equipment, in particular to a leg training device for sitting and lying positions. Background Art

[0002] Because busy daily routines demand a lot of time, many fitness enthusiasts currently prefer to exercise indoors. This is because indoor environments offer greater privacy and a more comfortable overall environment. However, indoor spaces are relatively cramped, so exercise often requires the use of fitness equipment to achieve better results.

[0003] Indoor fitness equipment allows for more targeted training of muscles in different locations. For example, leg exercises primarily focus on forward kicks and backward hooks. These two movements, combined with the equipment's weights, are effective in shaping the legs and strengthening the knee joints. While current fitness equipment supports both movements, backward hooks are typically performed while standing, while prone backward hooks are often performed on separate equipment. There is a lack of fitness equipment that can combine forward kicks with prone backward hooks. Utility Model Content

[0004] In view of one of the deficiencies of the prior art, the utility model provides a leg training device for sitting and lying positions, which solves the problem of how to integrate the front kicking action and the lying back leg hooking action into the same fitness equipment.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a leg training device for sitting or lying positions, with the side where the user's legs are located during use as the front side, and the device comprising:

[0006] The main bracket can be placed on the ground to serve as a supporting structure;

[0007] A back pad is rotatably connected to the main support, and a positioning structure capable of locking the rotation angle of the back pad is provided between the back pad and the main support;

[0008] A seat cushion is arranged in front of the back cushion, and the front portion of the seat cushion is rotatably connected to the main support;

[0009] A locking mechanism is connected to the main support and is disposed below the back cushion and the seat cushion. The device includes a lying position and a sitting position. In the sitting position, the back cushion is linked to the locking structure, and the back cushion is locked in position by the locking mechanism.

[0010] The moving part is arranged at the front end of the main support and is rotatably connected to the main support; the moving part can be driven by the user's legs to swing.

[0011] Preferably, the main support comprises:

[0012] The support body is formed by connecting a number of support rods and can be placed on the ground;

[0013] A front connecting portion is provided at the front of the bracket body, wherein the front side of the front connecting portion is rotatably connected to the moving portion, and the rear side of the front connecting portion is rotatably connected to the seat cushion;

[0014] A rear connecting portion is provided at the rear of the bracket body, and the rear connecting portion is rotatably connected to the back pad;

[0015] The protection component is arranged corresponding to the locking structure, and the protection component is a guard plate structure arranged on the outside of the locking structure.

[0016] Preferably, the back pad comprises:

[0017] The back cushion body is used to support the trunk of the human body;

[0018] A back cushion frame is provided at the rear side of the back cushion body, and the back cushion frame is rotatably connected to the rear connecting portion;

[0019] The positioning structure includes:

[0020] A positioning plate is fixedly arranged on the rear connecting portion, and a plurality of positioning holes are opened on the positioning plate;

[0021] The positioning pin is plugged into the back cushion frame and can be inserted into the positioning hole of the positioning plate.

[0022] Preferably, the back cushion frame further comprises:

[0023] A hanging member is provided at one end of the back cushion frame facing the seat cushion;

[0024] The seat cushion comprises:

[0025] The seat cushion body is used to support the buttocks of the human body when sitting, and to support the thighs of the human body when lying down;

[0026] A seat cushion frame, wherein the seat cushion body is rotatably connected to the front connecting portion via the seat cushion frame;

[0027] The hooking member is arranged at one end of the seat cushion frame toward the back cushion, and the hooking member corresponds to the hanging member; when the device is in a lying position, the hanging member and the hooking member are connected, and the back cushion locks the position of the seat cushion through the hanging member and the hooking member.

[0028] Preferably, the hanging member comprises a hanging rod, the axial direction of the hanging rod is parallel to the axial direction of the rotating shaft of the back pad frame and the rear connecting part;

[0029] The hooking member is a hook-shaped structure arranged at the end of the seat cushion frame, and its open end is opened toward the back cushion.

[0030] Preferably, the hook-shaped structure opening of the hook member includes:

[0031] The end opening is provided at the end of the hook member close to the back pad, the end opening is a bell mouth, the large end of the end opening faces the back pad, and the lower edge of the end opening is upwardly tilted;

[0032] The inner opening is communicated with the end opening, and the inner opening is a straight strip-shaped opening, and the height of the inner opening corresponds to the outer diameter of the hanging component.

[0033] Preferably, the locking mechanism comprises:

[0034] A locking frame, fixedly arranged on the bracket body;

[0035] a shift rod, rotatably connected to the locking frame, and located below the back cushion frame;

[0036] A pressure rod is rotatably connected to the locking frame, and the pressure rod is located below the seat cushion frame;

[0037] A connecting rod is provided between the shifting rod and the pressure rod; both ends of the connecting rod are rotatably connected to the shifting rod and the pressure rod respectively;

[0038] When the user is in a sitting position, the hanging member and the shifting rod are linked together, and driven by the connecting rod, the pressing rod and the hook member are engaged.

[0039] Preferably, the lower portion of the lever is rotatably connected to the locking frame and the connecting rod respectively, and a hook is provided on the upper end of the lever, which is linked to the hanging member through the hook;

[0040] A clamping block is provided at one end of the pressure rod facing the front side, and the clamping block can be clamped into the end opening of the hook member.

[0041] Preferably, the locking mechanism further comprises:

[0042] The reset member is arranged between the connecting rod and the locking frame and can drive the connecting rod to reset.

[0043] Preferably, the back pad further comprises:

[0044] An adjustment plate, fixedly arranged on the rear side of the back pad, with a plurality of adjustment holes opened on the plate body;

[0045] The adjusting pin is plugged into the back cushion frame and can be inserted into the adjusting hole on the adjusting plate.

[0046] Compared with the existing technology, it has the following beneficial effects: the device takes up very little space, can change its shape according to the needs of the user, and can switch between a sitting state and a lying state through simple operations to meet the different requirements of the user for kicking and hooking exercises.

[0047] The device uses the linkage of the seat cushion frame, the back cushion frame and the locking mechanism to lock the seat cushion in two states respectively, reducing the structural points that need to be adjusted when changing the working state of the device, simplifying the operation difficulty for the user, and improving safety during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present application;

[0049] Figure 2 This is a schematic diagram of a lying position according to an embodiment of the present application;

[0050] Figure 3 This is a schematic diagram of a sitting posture according to an embodiment of the present application;

[0051] Figure 4 This is a schematic diagram of an intermediate state of an embodiment of the present application;

[0052] Figure 5 for Figure 4 A partial enlarged view of;

[0053] Figure 6 This is a diagram of the locking mechanism in a lying position according to an embodiment of the present application;

[0054] Figure 7 This is a diagram of the locking mechanism in the sitting position according to an embodiment of the present application.

[0055] In the picture:

[0056] 1. Main bracket; 11. Bracket body; 111. Recumbent armrest; 12. Protective structure; 12. Front connection; 13. Rear connection; 131. Positioning plate; 14. Protective assembly;

[0057] 2. Back cushion; 21. Back cushion body; 22. Back cushion frame; 221. Positioning pin; 222. Hooking piece; 223. Adjusting pin; 3. Seat cushion; 31. Seat cushion body; 32. Seat cushion frame; 321. Hooking piece; 4. Locking mechanism; 41. Push rod; 42. Connecting rod; 43. Pressing rod; 5. Moving part; 51. Moving frame. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0059] See also Figure 1-Figure 3 , this application provides the following technical solutions:

[0060] A leg training device for sitting and lying positions is provided. The device can be used in both sitting and lying positions. For ease of illustration, the side where the user's legs are positioned during use is referred to as the front side. The device comprises a main frame 1, which rests on the ground and serves as a supporting structure. A back cushion 2 is rotatably connected to the main frame 1. A positioning structure is provided between the back cushion 2 and the main frame 1 to lock the rotation angle of the back cushion 2. A seat cushion 3 is provided in front of the back cushion 2, and the front lower side of the seat cushion 3 is rotatably connected to the main frame 1. A locking mechanism 4 is also provided. The locking mechanism 4 is connected to the main frame 1 and located below the opposite side of the back cushion 2 and seat cushion 3. In the lying position, the back cushion 2 locks the seat cushion 3 in place. In the sitting position, the back cushion 2 interacts with the locking mechanism 4, and the back cushion 2 is locked in place by the locking mechanism 4. A moving portion 5 is provided at the front end of the main frame 1, rotatably connected to the main frame 1. The moving portion 5 can be driven to swing by the user's legs.

[0061] The main bracket 1 includes a bracket body 11, a front connecting portion 12, a rear connecting portion 13, and a protective assembly 14. The bracket body 11 is formed by connecting a number of support rods and can be placed on the ground. A lying armrest 111 is provided on the bracket body. The lying armrest 111 is located below the back cushion 2, and one is provided on each side of the bracket body 11. The front connecting portion 12 is provided at the front of the bracket body 11. The front side of the front connecting portion 12 is rotatably connected to the moving portion 5, and the rear side is rotatably connected to the seat cushion 3. The rear connecting portion 13 is provided at the rear of the bracket body 11. The rear connecting portion 13 is rotatably connected to the back cushion 2. The protective assembly 14 is provided corresponding to the locking structure 4. The protective assembly 14 is a guard plate structure provided on the outside of the locking structure 4.

[0062] The movement unit 5 comprises a movement frame 51, which is shaped like a figure 7 and pivotally connected to the front connection portion 12 at its bend. Telescopic rods are located at each end of the movement frame 51. Pull-out pins and holes are located on the inner and outer rods, respectively, for adjusting the length of the rods. Two pairs of rollers, totaling four, are located at the movable ends of the telescopic rods at each end of the movement frame 51. These rollers facilitate positioning of the user's legs and corners.

[0063] When using the device, the user can choose to perform kicking exercises in a sitting position or hooking exercises in a prone position, simply by adjusting the positions of the back cushion 2 and the seat cushion 3 accordingly. Figure 2 This is an illustration of use in a lying position, where the lying armrest 111 is used for holding onto in a lying position to enhance body stability. Figure 3This is a diagram of a sitting position. On either side of the seat cushion 3 are armrests for gripping while in a sitting position. There are multiple ways to increase the weight during exercise. First, the user can choose to add a lashing weight to their legs. Second, a barbell hanging rod can be added to the exercise frame 51, allowing the barbell plate to be attached to the rod, thereby increasing the weight during exercise and enhancing the effect.

[0064] On the basis of the above-mentioned embodiment, the back cushion 2 includes a back cushion body 21 and a back cushion frame 22. The back cushion body 21 adopts a structure that is wide at the bottom and narrow at the top. In the sitting state, the back cushion body 21 is used to support the back of the human body. In the lying state, the back cushion body 21 is used to support the chest of the human body. The back cushion frame 22 is arranged on the rear side of the back cushion body 21, and the back cushion frame 22 is rotatably connected to the rear connecting part 13. The positioning structure for positioning the back cushion 2 includes a positioning plate 131 and a positioning pin 221. The positioning plate 131 is fixedly arranged on the rear connecting part 13. Two positioning holes are provided on the positioning plate 131. The two positioning holes correspond to the positioning positions in the sitting state and the lying state, respectively. A positioning pin 221 is inserted into the back cushion frame 22, and the positioning pin 221 can be inserted into the positioning hole of the positioning plate 131. The positioning pin 221 is a pull-out spring pin. When the positioning pin 221 is pulled open, the back cushion frame 22 can rotate freely. When the back cushion frame 22 rotates to a sitting or lying working position, the positioning pin 221 is inserted into the positioning hole of the positioning plate 131 under the action of elastic reset.

[0065] The seat cushion 3 comprises a seat cushion body 31 and a seat cushion frame 32. The seat cushion body 31 supports the buttocks in a sitting position, and the thighs in a lying position. The seat cushion frame 32 is located on the underside of the seat cushion body 31, and the seat cushion body 31 is pivotally connected to the front connecting portion 12 via the seat cushion frame 32. Because the position of the seat cushion 3 can be fixed by the back pad 2 and the locking mechanism 4, there is no need for a fixed structure for the seat cushion 3. This simplifies adjustment during use and, by extension, improves safety during use.

[0066] Based on the above implementation plan, see Figure 4 and Figure 5 The back cushion frame 22 has a hooking member 222 at one end facing the seat cushion 3. The hooking member 222 includes a hanging rod, the rod body of which is axially parallel to the axis of rotation of the back cushion frame 22 and the rear connecting portion 13. Corresponding to the hooking member 222, a hooking member 321 is provided at the end of the seat cushion frame 32 facing the back cushion 2. The hooking member 321 is a hook-shaped structure provided at the end of the seat cushion frame 32, with its open end facing the back cushion 2.

[0067] The hook-shaped opening of the hook member 321 includes an end opening and an inner opening. Figure 5The end opening is a bell-shaped structure, located at the end of the hook 321 near the back pad 2. Its large end faces the back pad 2, and the lower edge of the end opening is upwardly tilted. The inner opening is connected to the end opening and is a straight strip-shaped opening. The height of the inner opening corresponds to the outer diameter of the hook 222.

[0068] When the device is in a lying position, the hanging member 222 is connected to the hook member 321, and the hanging rod is inserted into the inner opening. Figure 2 In the state shown, the hanging member 222 presses against the hook member 321 from bottom to top, so that the back cushion 2 locks the position of the seat cushion 3.

[0069] See also Figure 3 When the device is in a sitting position, the hooking member 222 triggers the action of the locking mechanism 4, and the locking mechanism 4 presses the hooking member 321, thereby locking the position of the seat cushion 3.

[0070] Based on the above-mentioned embodiment, this embodiment provides a specific structure of a locking mechanism 4. The locking mechanism 4 includes a locking frame 41 fixedly mounted on the bracket body 11. A shift lever 42 and a pressure lever 43 are rotatably connected to the locking frame 41. The shift lever 42 is located below the back cushion frame 22, and the pressure lever 43 is located below the seat cushion frame 32. A connecting rod 44 is disposed between the shift lever 42 and the pressure lever 43. The ends of the connecting rod 44 are rotatably connected to the shift lever 42 and the pressure lever 43, respectively. When the seat cushion 3 is in the sitting position, the hook 222 and the shift lever 42 work in conjunction. The shift lever 42 pushes the connecting rod 44 forward, which in turn rotates the pressure lever 43. The rotation of the pressure lever 43 presses the hook 321, thereby positioning the seat cushion 3.

[0071] Based on the above implementation plan, see Figure 6 and Figure 7 The lever 42 is a rod-shaped structure with a hook at its upper end. The hook is connected to the hanging rod of the hanging member 222. When the back cushion 2 is changed from a lying position to a sitting position, the hook of the lever 42 hooks the hanging rod of the hanging member 222, and the hanging member 222 moves the lever 42 backward. Figure 6 The directions are for illustration purposes only. The shift lever 42 and the pressure lever 43 are respectively connected to the locking frame 41 through a similar connecting structure. The connecting structure includes two parallel plates. The upper ends of the plates of the two connecting members are fixedly connected to the shift lever 42 and the pressure lever 43, respectively. Two rotating shafts are provided on the connecting structure as positions for rotational connection. The connecting structure of the shift lever 42 has an upper rotating shaft that is rotationally connected to the locking frame 41, and a lower rotating shaft that is rotationally connected to the connecting rod 44. The connecting structure of the pressure lever 43 has an upper rotating shaft that is rotationally connected to the connecting rod 44, and a lower rotating shaft that is rotationally connected to the locking frame 41. The pressure lever 43 is in the shape of a "7". When it is changed to a sitting state, its end is driven by the connecting rod 44 to be clamped into the end opening of the hook member 321, thereby fixing the seat cushion 3.

[0072] Based on the above implementation scheme, the locking mechanism 4 also includes a reset member 45, which is arranged between the connecting rod 44 and the locking frame 41. The reset member 45 is a spring, and its two ends are respectively connected to the connecting rod 44 and the locking frame 41, which can drive the connecting rod 44 to reset. Figure 7 One end of the reset member 45 and the connection point of the connecting rod 44 are shown separated, and in actual use, the two remain connected.

[0073] Based on the above implementation plan, see Figure 3 and Figure 4 The back cushion 2 also includes an adjustment plate and adjustment pins. The adjustment plate is fixed to the rear side of the back cushion 2 and has a number of adjustment holes. The adjustment pins 223 are plugged into the back cushion frame 22 and can be inserted into the adjustment holes on the adjustment plate. The back cushion body 21 and the upper end of the back cushion frame 22 are rotatably connected. When the angle of the back cushion body 21 needs to be adjusted, simply pull out the adjustment pins 223, change the angle of the back cushion body 21, and then select the appropriate position and reinsert the adjustment pins 223 into the adjustment plate.

[0074] In the description of the present application and its embodiments, it should be understood that the terms "top", "bottom", "height", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present application.

[0075] In this application and its embodiments, unless otherwise expressly specified or limited, terms such as "disposed," "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0076] In the present application and its embodiments, unless otherwise expressly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0077] The disclosure above provides many different embodiments or examples for realizing the different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described above. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art will appreciate the application of other processes and / or the use of other materials.

[0078] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0079] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A sitting and lying leg training device, characterized in that: Taking the side where the user's legs are located when in use as the front side, the device includes: The main bracket can be placed on the ground to serve as a supporting structure; A back pad is rotatably connected to the main support, and a positioning structure capable of locking the rotation angle of the back pad is provided between the back pad and the main support; A seat cushion is arranged in front of the back cushion, and the front portion of the seat cushion is rotatably connected to the main support; A locking mechanism is connected to the main support and is disposed below the back cushion and the seat cushion. The device includes a lying position and a sitting position. In the sitting position, the back cushion is linked to the locking structure, and the back cushion is locked in position by the locking mechanism. The moving part is arranged at the front end of the main support and is rotatably connected to the main support; the moving part can be driven by the user's legs to swing.

2. The leg training device for sitting and lying postures according to claim 1, characterized in that: The main support comprises: The support body is formed by connecting a number of support rods and can be placed on the ground; A front connecting portion is provided at the front of the bracket body, wherein the front side of the front connecting portion is rotatably connected to the moving portion, and the rear side of the front connecting portion is rotatably connected to the seat cushion; A rear connecting portion is provided at the rear of the bracket body, and the rear connecting portion is rotatably connected to the back pad; The protection component is arranged corresponding to the locking structure, and the protection component is a guard plate structure arranged on the outside of the locking structure.

3. The leg training device for sitting and lying postures according to claim 2, characterized in that: The back pad comprises: The back cushion body is used to support the trunk of the human body; A back cushion frame is provided at the rear side of the back cushion body, and the back cushion frame is rotatably connected to the rear connecting portion; The positioning structure includes: A positioning plate is fixedly arranged on the rear connecting portion, and a plurality of positioning holes are opened on the positioning plate; The positioning pin is plugged into the back cushion frame and can be inserted into the positioning hole of the positioning plate.

4. The leg training device for sitting and lying postures according to claim 3, characterized in that: The back cushion frame also includes: A hanging member is provided at one end of the back cushion frame facing the seat cushion; The seat cushion comprises: The seat cushion body is used to support the buttocks of the human body when sitting, and to support the thighs of the human body when lying down; A seat cushion frame, wherein the seat cushion body is rotatably connected to the front connecting portion via the seat cushion frame; The hooking member is arranged at one end of the seat cushion frame toward the back cushion, and the hooking member corresponds to the hanging member; when the device is in a lying position, the hanging member and the hooking member are connected, and the back cushion locks the position of the seat cushion through the hanging member and the hooking member.

5. The leg training device for sitting and lying positions according to claim 4, characterized in that: The hanging member includes a hanging rod, the rod body of the hanging rod is axially parallel to the axis of the rotation axis of the back pad frame and the rear connecting part; The hooking member is a hook-shaped structure arranged at the end of the seat cushion frame, and its open end is opened toward the back cushion.

6. The leg training device for sitting and lying positions according to claim 5, characterized in that: The hook-shaped structure opening of the hook member includes: The end opening is provided at the end of the hook member close to the back pad, the end opening is a bell mouth, the large end of the end opening faces the back pad, and the lower edge of the end opening is upwardly tilted; The inner opening is communicated with the end opening, and the inner opening is a straight strip-shaped opening, and the height of the inner opening corresponds to the outer diameter of the hanging component.

7. The leg training device for sitting and lying positions according to claim 6, characterized in that: The locking mechanism comprises: A locking frame, fixedly arranged on the bracket body; a shift rod, rotatably connected to the locking frame, and located below the back cushion frame; A pressure rod is rotatably connected to the locking frame, and the pressure rod is located below the seat cushion frame; A connecting rod is provided between the shifting rod and the pressure rod; both ends of the connecting rod are rotatably connected to the shifting rod and the pressure rod respectively; When the user is in a sitting position, the hanging member and the shifting rod are linked together, and driven by the connecting rod, the pressing rod and the hook member are engaged.

8. The leg training device for sitting and lying postures according to claim 7, characterized in that: The lower portion of the lever is rotatably connected to the locking frame and the connecting rod respectively, and a hook body is provided on the upper end of the lever, which is linked to the hanging member through the hook body; A clamping block is provided at one end of the pressure rod facing the front side, and the clamping block can be clamped into the end opening of the hook member.

9. The leg training device for sitting and lying positions according to claim 7, characterized in that: The locking mechanism further comprises: The reset member is arranged between the connecting rod and the locking frame and can drive the connecting rod to reset.

10. The sitting and lying leg training device according to claim 9, characterized in that: The back pad also includes: An adjustment plate, fixedly arranged on the rear side of the back pad, with a plurality of adjustment holes opened on the plate body; The adjusting pin is plugged into the back cushion frame and can be inserted into the adjusting hole on the adjusting plate.

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