Headstand exerciser

Abstract

The utility model provides a handstand exerciser which comprises a haunching frame and a backrest, the backrest is connected to the haunching frame in a pivoted mode, the handstand exerciser is used for a user to practice handstand exercises, and an angle locking mechanism is arranged between the haunching frame and the backrest so that the angle between the haunching frame and the backrest can be locked. Therefore, a user can better find a proper angle through the back to exercise, force can be better exerted, and the safety in the using process can also be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fitness auxiliary equipment for human body movement exercise, and particularly relates to an inversion exerciser. Background Art

[0002] The inversion exerciser is an auxiliary tool that has emerged in recent years, aiming to help practitioners, especially yoga practitioners, complete inversion movements more safely and effectively. This kind of exerciser is usually designed as an adjustable support structure. For beginners, it can help support the user's body and practice some semi-inverted postures, such as shoulder stand, etc., which can help them gradually adapt to the inverted state and reduce the difficulty of inversion. However, the existing inversion exerciser is difficult to fix the angle after adjusting the angle. If the angle is not fixed, it is easy to cause the user to have difficulty finding a suitable angle to roll the roller through the back, so it is impossible to exert force well. In addition, the existing inversion exerciser cannot perform safety limit on the maximum value of the adjusted angle, and the safety performance is poor. Moreover, when the existing inversion exerciser is in motion, the head of the practitioner is in a suspended state, and the support for the head of the practitioner is poor, and the risk of movement is likely to occur. Summary of the Utility Model

[0003] Therefore, in view of at least one of the above problems, the utility model provides an inversion exerciser.

[0004] The utility model is realized by the following scheme:

[0005] The utility model provides an inversion exerciser, which includes a lumbar arch frame and a backrest. The backrest is pivotally connected to the lumbar arch frame. The inversion exerciser is used for users to practice inversion movements. An operable angle locking mechanism is provided between the lumbar arch frame and the backrest. By operating the angle locking mechanism, the backrest can rotate freely relative to the lumbar arch frame or the backrest and the lumbar arch frame can be locked at at least one set rotation angle.

[0006] Wherein, in one embodiment, the backrest and the lumbar arch frame are pivotally connected by the mutual sleeving of a pivot sleeve and a rotating shaft rod; the angle locking mechanism is arranged between the pivot sleeve and the rotating shaft rod.

[0007] Wherein, in one embodiment, a first mounting member is fixedly connected to the rotating shaft rod, and a first locking structure is arranged on the first mounting member; a second mounting member is fixedly connected to the pivot sleeve, the first mounting member and the second mounting member are opposite and arranged side by side, and a second locking structure is arranged on the second mounting member. The first locking structure and the second locking structure are a set of a pin and a bayonet that can be engaged with each other to form the angle locking mechanism, so that the angle between the lumbar arch frame and the backrest can be locked.

[0008] Among them, in one embodiment, the first locking structure is a protruding pin provided on the first mounting member as a locking pin, and the second locking structure is at least one opening provided on the second mounting member as a bayonet. The protruding pin is axially displaceably connected to the first mounting member, so that the protruding pin can be engaged with or disengaged from the opening through axial displacement. When the protruding pin is engaged with the opening, the rotation angle of the backrest relative to the lumbar arch support is locked.

[0009] Among them, in one embodiment, the rotating shaft rod is composed of a middle tube and connecting sleeves connected to both ends of the middle tube; the first mounting member is connected to the outer periphery of the connecting sleeve and extends radially outward from the outer periphery of the connecting sleeve into a plate shape; the second mounting member is connected to the outer periphery of the pivot sleeve and extends radially outward from the outer periphery of the pivot sleeve into a plate shape.

[0010] Among them, in one embodiment, the outer edge of the first mounting member extends along the axial direction of the connecting sleeve and towards the direction close to the second mounting member to form a flange wall.

[0011] Among them, in one embodiment, an angle limiting mechanism is further provided between the pivot sleeve and the rotating shaft rod for limiting the maximum angle range within which the backrest can freely rotate relative to the lumbar arch support.

[0012] Among them, in one embodiment, a first mounting member is fixedly connected to the rotating shaft rod, a second mounting member is fixedly connected to the pivot sleeve, and a first limiting structure is provided on the first mounting member; a second limiting structure is provided on the second mounting member, wherein the first limiting structure and the second limiting structure are a set of convex blocks and sliding grooves that can be mutually limited and matched, so that the maximum rotation angle of the pivot sleeve relative to the rotating shaft rod can be limited.

[0013] Among them, in one embodiment, the first limiting structure is a convex platform provided on the first mounting member as a convex block, and the second limiting structure is an arc-shaped groove provided on the second mounting member as a sliding groove. The arc-shaped groove is at least partially arranged around the pivot sleeve, and the convex platform can slide in the arc-shaped groove and is limited by the arc-shaped groove.

[0014] Among them, in one embodiment, the lumbar arch support includes two support foot frames and a rotating shaft rod connected between the two support foot frames; the backrest includes a pivot sleeve; the pivot sleeve is pivotally sleeved on the outer periphery of the rotating shaft rod, so that the backrest is pivotally connected to the lumbar arch support; an armrest is provided on the outer side of the support foot frame.

[0015] Among them, in one embodiment, the arch waist support includes two support brackets, and the backrest includes a main structural tube. A buffer elastic rope is connected between the two support brackets of the arch waist support and the main structural tube of the backrest.

[0016] Among them, in one embodiment, the inverted exerciser further includes a headrest, and the headrest is detachably and height-adjustably connected to the backrest.

[0017] Through the technical solution provided by the present utility model, the following technical effects are achieved:

[0018] 1. The present utility model provides an inverted exerciser, which includes an arch waist support and a backrest. An angle locking mechanism is provided between the arch waist support and the backrest, enabling the arch waist support and the backrest to rotate freely and be locked at multiple angles. Thus, the user can better find a suitable angle through the back for exercise, can exert force better, and can also improve the safety during use.

[0019] 2. An angle limiting mechanism is further provided between the pivot sleeve and the central axis between the arch waist support and the backrest, limiting the maximum adjustable angle of the backrest relative to the arch waist support, and greatly improving the safety of the inverted exerciser. When performing assisted inverted training in a freely rotatable manner, safety is ensured. It avoids excessive flipping of the human body during training and also prevents the device from tipping over due to excessive flipping, which may further harm the human body due to unstable support.

[0020] 3. A buffer elastic rope is connected between the two support brackets of the arch waist support and the main structural tube of the backrest. The buffer elastic rope can buffer the rotational movement of the backrest on the arch waist support, prevent the backrest from rotating too fast during the user's movement, which may cause safety hazards, and also prevent the backrest from flipping too fast when the human body's core strength is insufficient, causing the device to tip over and harm the human body, further improving the safety during assisted inverted training in a freely rotatable manner. Moreover, the buffer elastic rope can help the backrest return to the initial position in a timely manner, making it more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is the three-dimensional view of the inverted exerciser in this embodiment;

[0022] Figure 2 is the exploded view of the inverted exerciser in this embodiment;

[0023] Figure 3 is the three-dimensional view of the inverted exerciser in another direction in this embodiment;

[0024] Figure 4 is Figure 3 the enlarged view at A in

[0025] Figure 5is an exploded view of the angle locking mechanism and the angle limiting mechanism of this embodiment;

[0026] Figure 6 is an exploded view of the arch waist support of this embodiment;

[0027] Figure 7 is an exploded view of the backrest and the headrest of the inverted exerciser of this embodiment;

[0028] Figure 8 is a three-dimensional view of the inverted exerciser in the improved embodiment;

[0029] Figure 9 is a side view of the backrest of the inverted exerciser of this embodiment connected to the arch waist support at different angles. Detailed implementation manners

[0030] To further illustrate each embodiment, the present utility model provides accompanying drawings. These accompanying drawings are a part of the disclosure content of the present utility model, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principle of the embodiments. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present utility model. The components in the drawings are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0031] Now, the present utility model will be further described in conjunction with the accompanying drawings and the detailed implementation manners.

[0032] As Figure 1-9 shown, this embodiment provides an inverted exerciser 1, which includes an arch waist support 10, a backrest 20, and a headrest 30. The backrest 20 is pivotally connected to the arch waist support 10, and the inverted exerciser 1 is used for users to practice inverted exercises. The backrest 20 includes a main structural tube 21 and rollers 25 rotatably connected to both sides of the main structural tube 21, so that the backrest 20 has an "abundant" - shaped structure. Multiple massage protrusions can be arranged on the surface of the rollers 25, and the massage protrusions can massage the muscles, thereby enhancing the exercise effect of the inverted exerciser 1. Of course, in other embodiments, the backrest 20 can also adopt a plate - type backrest, which is used for users with back and spinal injuries. The backrest of this structure can play a role in providing a complete surface support.

[0033] The backrest 20 and the arch waist support 10 are pivotally connected through the mutual sleeving of a pivot sleeve and a rotating shaft rod. Specifically, in this embodiment, the arch waist support 10 includes two support footrests 11 and a rotating shaft rod 13 connected between the two support footrests 11. The middle part of the backrest 20 is pivotally connected to the rotating shaft rod 13. The rotating shaft rod 13 is arranged in the middle of the tops of the two support footrests 11, so that the backrest 20 is pivotally connected to the middle position at the top of the arch waist support 10.

[0034] A connecting pipe 22 is connected to the dorsal side of the main structural pipe 21. One end of the connecting pipe 22 is connected to the main structural pipe 21, and the other end is connected to the pivot sleeve 23. The pivot sleeve 23 is sleeved on the outer periphery of the rotating shaft rod 13, so that the backrest 20 is pivotally connected to the rotating shaft rod 13. It is easy to understand that in other embodiments, a rotating shaft rod can also be provided on the backrest 20, and a pivot sleeve can be provided on the arch waist frame 10, so as to pivotally connect the backrest 20 to the arch waist frame 10.

[0035] An operable angle locking mechanism is provided between the arch waist frame 10 and the backrest 20. By operating the angle locking mechanism, the backrest 20 can rotate freely relative to the arch waist frame 10 or the backrest 20 and the arch waist frame 10 can be locked at at least one set rotation angle. In this embodiment, the angle locking mechanism is provided between the pivot sleeve 23 and the rotating shaft rod 13. Specifically, a first mounting member 17 is fixedly connected to the rotating shaft rod 13, and a first locking structure is provided on the first mounting member 17; a second mounting member 24 is fixedly connected to the pivot sleeve 23, the first mounting member 17 and the second mounting member 24 are opposite and arranged side by side, and a second locking structure is provided on the second mounting member 24, wherein the first locking structure and the second locking structure are a set of a pin and a bayonet that can be engaged with each other, so that the arch waist frame 10 and the backrest 20 can rotate freely and can be locked at multiple angles, so that the user can better find a suitable angle through the back to exercise, so that better force can be exerted, so that the user can adapt to the inverted actions at different angles in the initial stage of practice and form a complete inverted action coherently after being proficient; and the safety during use can also be improved.

[0036] In this embodiment, the first locking structure is a convex pin 16 provided on the first mounting member 17 as a pin, and the second locking structure is an opening 242 provided on the second mounting member 24 as a bayonet. As Figure 3-5 shown, the convex pin 16 is axially displaceably connected to the first mounting member 17, so that the convex pin 16 can be engaged with or disengaged from the opening 242 through axial displacement. When the convex pin 16 is engaged with the opening 242, the angle of the first mounting member 17 relative to the second mounting member 24 is locked, so that the angle of the backrest 20 relative to the arch waist frame 10 can be locked. By using the way of engaging the convex pin 16 with the opening 242 as the angle locking mechanism, the structure is simple and reliable, easy to manufacture, low in cost, and the safety of the device is improved.

[0037] As Figure 2-5 shown, in this embodiment, the number of the openings 242 on the second mounting member 24 is 3, so that the backrest 20 can be locked at three different angles relative to the arch waist frame 10, as Figure 9As shown. Of course, the number of the openings 242 on the second mounting member 24 may also be more or less than 3, so that the backrest 20 can be locked relative to the lumbar support 10 at more or fewer different angles. For example, the number of the openings 242 on the second mounting member 24 may also be 1 or 2 or 4.

[0038] The rotating shaft rod 13 may be composed of a middle tube 131 and connecting sleeves 132 connected to both ends of the middle tube 131. The middle tube 131 is sleeved in the inner cavity of the connecting sleeve 132, and the middle tube 131 and the connecting sleeve 132 are locked to each other by screws 17. One end of the connecting sleeve 132 is locked and connected to the middle tube 131, and the other end of the connecting sleeve 132 is fixedly connected to the support leg frame 11. In this embodiment, the first mounting member 17 is connected to the outer periphery of the connecting sleeve 132 and extends radially outward along the outer periphery of the connecting sleeve 132 into a plate shape. The second mounting member 24 is connected to the outer periphery of the pivot sleeve 23 and extends radially outward along the outer periphery of the pivot sleeve 23 into a plate shape. The plate-shaped first mounting member 17 and the second mounting member 24 have a simpler structure and are easier to manufacture. Preferably, as Figure 4-5 shown, the outer edge of the first mounting member 17 further extends along the axial direction of the connecting sleeve 132 and towards the direction close to the second mounting member 24 to form a flange wall 171. The flange wall 171 forms a protection structure towards the second mounting member 24, which can prevent the angle locking mechanism from being accidentally touched, thereby improving safety.

[0039] In other embodiments, the angle locking mechanism between the lumbar support 10 and the backrest 20 may also be of other types. For example, the pivot sleeve and the rotating shaft rod can be locked to each other by a locking pin to form an angle locking mechanism; or a buckle can be used to lock the pivot sleeve and the rotating shaft rod to each other to form an angle locking mechanism.

[0040] An angle limiting mechanism is further provided between the lumbar support 10 and the backrest 20 for limiting the maximum angle range within which the backrest 20 can freely rotate relative to the lumbar support 10. In this embodiment, the angle limiting mechanism is arranged between the pivot sleeve 23 and the rotating shaft rod 13. Specifically, a first limiting structure is further provided on the first mounting member 17; a second limiting structure is further provided on the second mounting member 24, wherein the first limiting structure and the second limiting structure are a set of convex blocks and sliding grooves that can be mutually limited and matched, so that the maximum rotation angle of the pivot sleeve 23 relative to the rotating shaft rod 13 can be limited. In this embodiment, the first limiting structure is a boss 15 provided on the first mounting member 17 as a convex block, and the second limiting structure is an arc-shaped groove 241 provided on the second mounting member 24 as a sliding groove. As Figure 3-5As shown, the arc groove 241 is at least partially arranged around the pivot sleeve 23, and the boss 15 can slide in the arc groove 241 and be limited by the arc groove 241, so that the maximum value of the adjustable angle of the backrest 20 relative to the arch waist frame 10 is limited, and the safety of the inverted exerciser 1 is greatly improved; when performing auxiliary inverted training in a free rotation manner, safety is ensured. It prevents the human body from overturning excessively during training, and also prevents the equipment from overturning due to unstable support due to excessive turning, further injuring the human body. The angle locking mechanism and the angle limiting mechanism are simultaneously arranged between the first mounting member 17 and the second mounting member 24, with a compact structure, a simplified number of parts, and a low manufacturing cost.

[0041] In other embodiments, the angle limiting mechanism between the arch frame 10 and the backrest 20 may be of other types, for example, the angle limiting mechanism may be formed by setting a limit switch, or the angle limiting mechanism may be formed by setting a limit block.

[0042] like Figure 2-5 As shown, in this embodiment, a second mounting member 24 is disposed at each end of the pivot sleeve 23, respectively corresponding to the first mounting members 17 on the two connecting sleeves 132, so that the force on the inverted exerciser 1 is more balanced.

[0043] like Figure 1-2 As shown, the support frame 11 is an inverted U-shaped structure. The support legs of the support frame 11 that are in contact with the ground are provided with anti-skid pads 111, which are made of rubber, for example, so as to prevent slipping when the inverted exercise device 1 is placed on the ground.

[0044] An armrest 12 is provided on the outer side of the supporting foot frame 11, so that the user can grip the armrest 12 to exercise conveniently, the fulcrum point is better during exercise, and the exercise is more convenient and safer.

[0045] As a further improvement of this embodiment, Figure 8 As shown, a buffer elastic rope 40 is connected between the two supporting legs 11 of the arch waist frame 10 and the main structure tube 21 of the backrest 20. The buffer elastic rope 40 can buffer the rotational movement of the backrest 20 on the arch waist frame 10, preventing the backrest 20 from rotating too fast during exercise and causing safety hazards. It can also prevent the backrest from easily turning over too fast when the core strength of the human body is insufficient, causing the equipment to overturn and cause harm to the human body, further improving the safety of free rotation auxiliary handstand training. In addition, the buffer elastic rope 40 can help the backrest 20 to return to the initial position in time, making it more convenient to use.

[0046] like Figure 7As shown, the headrest 30 is detachably and height-adjustably connected to the backrest 20. Specifically, the headrest 30 includes a headrest tube 31 and a headrest roller 32 connected to one end of the headrest tube 31. The headrest tube 31 is telescopically inserted into the inner cavity of the main structure tube 21 of the backrest 20, and one end of the main structure tube 21 connected to the headrest tube 31 is connected to a locking member 20, which can lock the relative position of the main structure tube 21 and the headrest tube 31. Since the headrest 30 is height-adjustably connected to the backrest 20, it can support the heads of practitioners of different heights, has a wider range of applications, and is more comfortable for users to use.

[0047] The headrest tube 31 is provided with a plurality of positioning holes 311 along the length direction, the main structure tube 21 is threadedly connected with the locking piece 20, and the locking piece 20 can extend into the inner cavity of the main structure tube 21, so that when the headrest 30 is adjusted to a suitable height relative to the backrest 20, the locking piece 20 rotates and one end of the locking piece 20 extends into the inner cavity of the main structure tube 21, and one end of the locking piece 20 cooperates with the positioning hole 311 to lock the headrest tube 31, thereby locking the height of the headrest 30 relative to the backrest 20. The height adjustment structure is simple and reliable, and can improve the safety performance of the inverted exerciser 1.

[0048] The headrest 30 is detachably connected to the backrest 20. In some embodiments, the inverted exerciser 1 may not be provided with the headrest 30, which is also a feasible technical solution. In this solution, the arch frame 10 is placed on the ground to serve as an armrest, and the backrest 20 is provided for the waist and back to lie on and is in a seesaw-like manner. The middle of the back of the backrest 20 is eccentrically hinged to the middle of the top of the arch frame 10. When the backrest 20 is swung and flipped to the front or back side of the arch frame 10, it tilts, and one end of it touches the ground and the other end is tilted above the arch frame 10; when the arch frame 10 is grasped with both hands and the backrest 20 is flipped to the shoulders touching the ground and the waist and hips are off the ground and the feet are straightened, the human body is inverted.

[0049] An operable angle locking mechanism is provided between the lumbar arch support 10 and the backrest 20. As a result, the lumbar arch support 10 and the backrest 20 can rotate freely and can be locked at multiple angles, enabling the user to find a suitable angle for exercise better through the back, thus being able to exert force better, being able to adapt to the inverted postures at different angles in the initial stage of practice, and forming a complete inverted posture coherently after proficiency; and it can also improve the safety during use. An angle limiting mechanism is also provided between the lumbar arch support 10 and the backrest 20 for limiting the maximum angle range within which the backrest 20 can rotate freely relative to the lumbar arch support 10, so as to limit the maximum value of the adjustable angle of the backrest 20 relative to the lumbar arch support 10, and the safety of the inverted exercise device 1 is greatly improved; when performing assisted inverted training in a freely rotatable manner, safety is ensured. It prevents the human body from over-turning during training and also prevents the device from toppling due to over-turning, which may further harm the human body due to unstable support. A buffer elastic rope 40 is connected between the two support feet 11 of the lumbar arch support 10 and the main structure tube 21 of the backrest 20. The buffer elastic rope 40 can buffer the rotational movement of the backrest 20 on the lumbar arch support 10, prevent the backrest 20 from rotating too fast during the user's movement, which may cause potential safety hazards, and at the same time can also prevent the backrest from flipping too fast when the core strength of the human body is insufficient, causing the device to topple and harm the human body, further improving the safety during assisted inverted training in a freely rotatable manner. Moreover, the buffer elastic rope 40 can help the backrest 20 return to the initial position in time, making it more convenient to use.

[0050] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes can be made to the present invention in terms of form and details without departing from the spirit and scope of the present invention as defined by the appended claims, and all such changes are within the protection scope of the present invention.

Claims

1. An inverted exerciser, comprising an arched waist frame and a backrest, wherein the backrest is pivotally connected to the arched waist frame, and the inverted exerciser is used for a user to practice inverted exercise, characterized in that: An operable angle locking mechanism is provided between the waist frame and the backrest, and by operating the angle locking mechanism, the backrest can be freely rotated relative to the waist frame or the backrest and the waist frame can be locked at at least one set rotation angle.

2. The inverted exerciser according to claim 1, characterized in that: The backrest and the waist frame are pivotally connected by mutual sleeve connection of a pivot sleeve and a rotating shaft rod; the angle locking mechanism is arranged between the pivot sleeve and the rotating shaft rod.

3. The inverted exerciser according to claim 2, characterized in that: A first mounting member is fixedly connected to the rotating shaft rod, and a first locking structure is arranged on the first mounting member; a second mounting member is fixedly connected to the pivot sleeve, the first mounting member and the second mounting member are arranged opposite to and side by side, and a second locking structure is arranged on the second mounting member, wherein the first locking structure and the second locking structure are a group of bayonet pins and bayonet sockets that can be engaged with each other, thereby forming the angle locking mechanism, so that the angle between the arch frame and the backrest can be locked.

4. The inverted exerciser according to claim 3, characterized in that: The first locking structure is a convex pin provided on the first mounting member as a bayonet, and the second locking structure is at least one opening provided on the second mounting member as a bayonet. The convex pin can be axially displacedly connected to the first mounting member, so that the convex pin can be engaged with or disengaged from the opening through axial displacement. When the convex pin is engaged with the opening, the rotation angle of the backrest relative to the arch frame is locked.

5. The inverted exerciser according to claim 3, characterized in that: The rotating shaft rod is composed of a middle tube and connecting sleeves connected to both ends of the middle tube; the first mounting member is connected to the outer periphery of the connecting sleeve, and extends radially outward from the outer periphery of the connecting sleeve to form a plate shape; the second mounting member is connected to the outer periphery of the pivot sleeve, and extends radially outward from the outer periphery of the pivot sleeve to form a plate shape.

6. The inverted exerciser according to claim 5, characterized in that: The outer edge of the first mounting member extends along the axial direction of the connecting sleeve and toward the direction approaching the second mounting member to form a flange surrounding wall.

7. The inverted exerciser according to claim 2 or 5, characterized in that: An angle limiting mechanism is also provided between the pivot sleeve and the rotating shaft rod for limiting the maximum angle range within which the backrest can freely rotate relative to the waist frame.

8. The inverted exerciser according to claim 7, characterized in that: A first mounting piece is fixedly connected to the rotating shaft rod, and a second mounting piece is fixedly connected to the pivot sleeve, and a first limiting structure is arranged on the first mounting piece; a second limiting structure is arranged on the second mounting piece, wherein the first limiting structure and the second limiting structure are a group of protrusions and sliding grooves that can cooperate with each other in limiting positions, so that the pivot sleeve can be limited relative to the maximum rotation angle of the rotating shaft rod.

9. The inverted exerciser according to claim 8, characterized in that: The first limiting structure is a boss provided on the first mounting member as a convex block, and the second limiting structure is an arcuate groove provided on the second mounting member as a sliding groove. The arcuate groove is at least partially provided around the pivot sleeve, and the boss can slide in the arcuate groove and be limited by the arcuate groove.

10. The inverted exerciser according to claim 2, characterized in that: The waist frame includes two supporting legs and a pivot rod connected between the two supporting legs; the backrest includes a pivot sleeve; the pivot sleeve is pivotally sleeved on the outer periphery of the pivot rod so that the backrest is pivotally connected to the waist frame; and an armrest is provided on the outer side of the supporting legs.

11. The inverted exerciser according to claim 2, characterized in that: The arch waist frame includes two supporting legs, and the backrest includes a main structural tube. A buffer elastic rope is connected between the two supporting legs of the arch waist frame and the main structural tube of the backrest.

12. The inverted exerciser according to claim 1, characterized in that: The inverted exerciser further comprises a headrest, which is detachably and height-adjustably connected to the backrest.

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