Posture Corrector Chair

Abstract

The present invention relates to a posture-correcting chair (1) comprising a base (10) and legs (30), the base (10) defining an interior space and including a lower surface, a front surface, a rear surface opposite the front surface, and an upper surface opposite the lower surface, the base (10) including a flat bracket at its lower surface and defining a circular opening on its upper surface, the chair (1) further comprising a proprioceptive element (20) including a seat portion and a crown, the seat portion being configured to receive the user's buttocks, the crown partially extending through the circular opening while forming a gap with the edge of the circular opening, and the portion of the crown including the pole resting on the flat bracket to allow the crown to tilt on the surface of the flat bracket.

Description

Technical Field

[0001] This invention relates to the field of devices for improving personal sitting posture, and more specifically to a posture-correcting chair. Background Technology

[0002] Today, many people sit for hours on end, especially in professional settings. This sedentary posture can expose these individuals to health risks such as musculoskeletal disorders (MSD).

[0003] One solution is to equip the work area with specialized equipment, particularly height-adjustable desks for standing work, as well as kneeling chairs or inflatable ball seats for sitting.

[0004] Kneeling chairs are typically equipped with wheels (casters) and include a seat and knee braces. These chairs do not have a backrest; the user stabilizes themselves by resting their knees on the braces. Therefore, this device forces the user to maintain an active posture while seated, but prolonged use can potentially lead to knee problems.

[0005] Compared to static chairs or seats, sitting balls force users to engage more muscles while seated, thus avoiding the harmful effects of prolonged sitting and changing the stress areas through the movement they provide.

[0006] However, the shape of the ball seat makes it difficult to store and move when not in use, forcing users to deflate and re-inflate it every time they want to, for example, rearrange their workspace or move the ball seat between home and office. Furthermore, the diameter and height of the ball seat are fixed.

[0007] Furthermore, the inflatable ball itself is unstable, and users may fall and get injured if they are not paying attention. Also, the diameter of such balls is fixed, so if the user wants the seat higher or lower, they must replace the ball. Finally, because there is no backrest, sitting on an inflatable ball for extended periods can be uncomfortable.

[0008] Several solutions have been developed to attempt to overcome these shortcomings. For example, there is a stool with a spherical connector, which includes a base from which a leg extends upward, connecting to the seat via a ball joint. This not only retains the principle of a ball seat but also has a small footprint and is easily height-adjustable. However, the seat remains unstable.

[0009] Patent document DE 10 2009 056692 B3 specifically proposes another solution, which includes a base defining a curved circular groove and a spherical portion. The convex portion of the spherical portion is mounted on a ball located at the center of the curved groove, while its flat portion forms a seat for the user to sit on.

[0010] This modular solution is easy to move, but it requires a bracket (such as a stool or base) for installation so that users can sit on it, which has several drawbacks. Therefore, if the base is placed on the bracket without being secured, it will be unstable and pose a risk of the user falling. Conversely, securing the base to the bracket can be cumbersome and time-consuming.

[0011] Furthermore, while the ball bearings can position and hold the spherical portion, friction occurs at the interface between the ball bearings and the spherical portion, which may restrict the user's movement and thus reduce the device's stimulating effect. Additionally, the curved surface of the grooves generates friction against the spherical portion, further restricting the user's freedom of movement, while the ball bearings serve to prevent slippage.

[0012] Therefore, a simple and effective solution is needed to at least partially compensate for these shortcomings. Summary of the Invention

[0013] Therefore, the present invention first relates to a posture-correcting chair, the chair comprising a base and a plurality of legs, the base defining an internal space and including a lower surface, a front surface, a rear surface opposite to the front surface, two side surfaces opposite to each other and connecting the front surface and the rear surface, and an upper surface opposite to the lower surface, the plurality of legs extending from the lower surface of the base, the chair being characterized in that: • The base includes a flat bracket on its lower surface and defines a circular opening on its upper surface; • The seat also includes a proprioceptive element comprising a seat portion and a crown, the seat portion being configured to receive the buttocks of a user of the seat, the crown partially passing through the circular opening while forming a gap with the edge of the circular opening, and the portion of the crown containing the pole resting on the flat bracket to allow the crown to tilt on the surface of the flat bracket.

[0014] "Posture-correcting chairs" refer to chairs that can significantly reduce the harmful consequences of prolonged sitting on posture and even health. "Proprioceptive elements" refer to components that stimulate joints and muscles to improve the user's posture.

[0015] The tilt of the spherical crown is constrained only by the edge of the circular opening. Since there are no ball bearings and a flat bracket is provided, the mechanical constraint is limited to the friction generated by the spherical crown against the flat bracket, and therefore its effect is much smaller than that of prior art solutions with curved grooves and central ball bearings. In particular, the point-spherical-plane connection provides more degrees of freedom than the prior art solution described in patent DE 10 2009056692 B3, which essentially restricts only one degree of freedom, namely translation along the plane normal. Therefore, by reducing friction and allowing greater freedom of movement, the seat according to the invention can achieve better proprioceptive training. For those skilled in the art, removing the ball bearings and using a flat bracket instead of a curved bracket seems counterintuitive, as this would disrupt the established positioning of the spherical crown at the center of the base. Furthermore, given patent DE 10 2009 056692 B3, those skilled in the art would prefer to employ a ball bearing system or surface treatment to reduce friction.

[0016] Preferably, the seat includes a threaded rod screw with a spring mounted on it, the spring being locked by a nut screwed onto the threaded rod. The head of the screw is located below the flat bracket, and the threaded rod passes through the flat bracket and the spherical portion of the crown at its extreme point to strengthen the connection while allowing the spherical portion to tilt on the flat bracket, thereby enabling the user to maintain balance and correct their posture. Tightening the screw by its head compresses or loosens the spring, thereby strengthening or disengaging the connection, making the spherical portion easier or more difficult to move according to the user's weight.

[0017] More preferably, the seat further includes a circular component comprising a flat surface abutting the spring and a convex surface (optionally via a washer) abutting the inner surface of the spherical portion at its extreme point, thereby allowing the spherical portion to tilt while providing a restoring force to return it to its initial position, i.e., an upright position, when not subjected to any external force.

[0018] In one embodiment, the seat includes a backrest. For example, the seat is a chair. The backrest extends from the upper surface of the base (e.g., via a connecting arm) to the rear surface of the base.

[0019] In another embodiment, the seat may be a stool or any other object for sitting.

[0020] Preferably, the backrest of the seat is foldable, for example, pivotally mounted between a use position and a storage position, in which the backrest is unfolded and in which the backrest is folded, so as to reduce the volume of the seat and make it easier to transport and store.

[0021] As a variation or additionally, the backrest is removable.

[0022] Advantageously, the backrest includes at least one locking member capable of locking the backrest in the stowed position and / or the used position to prevent the backrest from unfolding or folding itself during seat movement. Preferably, the at least one locking member includes a notch, hook, clip system, fastening strap, or any other suitable type of locking element.

[0023] More advantageously, in the folded position, the backrest folds over, against, the proprioceptive element, to hold it within the base. Therefore, when the seat is in the folded position, the proprioceptive element is locked within the base.

[0024] In one embodiment, the backrest is configured to conform to the proprioceptive element in the retracted position. Therefore, when the seat is in the retracted position, the proprioceptive element is fully locked by the backrest, preferably locked without gaps.

[0025] Advantageously, the backrest and the proprioceptive element have complementary shapes so that they nest together in the stowed position of the backrest. This nesting makes the seat more compact in the stowed position and ensures that the proprioceptive element is locked during transport.

[0026] Advantageously, the backrest is hinged to the base via one or more hinged connectors (particularly pivots, preferably self-locking pivots), for example, mounted on one or more connecting arms. This hinge configuration allows the seat to be easily and quickly switched between the use position and the storage position, and vice versa.

[0027] Preferably, each of the multiple support legs is hinged to the lower surface of the base and can be switched between the use position and the storage position. In the use position, the support legs are extended, and in the storage position, the support legs are folded, so as to further reduce the volume of the seat and make it easier to transport and store.

[0028] More preferably, each of the multiple support legs is connected to the lower surface of the base via a hinged joint, preferably a self-locking type. This hinge method allows the seat to be easily and quickly positioned in the use position without the need for additional locking devices to hold the support legs in the storage position.

[0029] Alternatively, each leg may include a male locking element (e.g., with a gear-shaped outer circumference) complementary to a female locking element (e.g., with a correspondingly hollow gear-shaped inner circumference), such that the male locking element can be inserted into the female locking element to lock the two locking elements in the rotational direction. These locking elements can lock the leg in an unfolded position for use with the seat, or in a folded position under the base.

[0030] Advantageously, in the folded-down position, each of the multiple legs is folded and rests against the lower surface of the base. The seat in this folded-down position is more compact, thus facilitating transport and storage.

[0031] Preferably, in the storage position, each of the plurality of legs is folded along one edge of the lower surface and abuts against the lower surface of the base.

[0032] More preferably, the height of the outrigger is adjustable, for example, through a telescopic structure.

[0033] According to one aspect of the invention, the seat portion includes a bracket fixed to the flat surface of the spherical crown, the bracket extending above an edge defining the circular opening. Thus, when the spherical crown is fully tilted, the bracket can rest against the edge to prevent the user from being in an uncomfortable position, or even to prevent them from falling off the seat.

[0034] Advantageously, the bracket is in the form of a board, such as a wooden board or a cushion.

[0035] In one embodiment, a handle is provided on one of the front surface, the rear surface, and the two side surfaces. Preferably, the handle is located on the front surface. This handle facilitates the movement of the seat when it is in the folded position.

[0036] Advantageously, the base is in the shape of a parallelepiped.

[0037] In another embodiment, the seat portion is formed by the flat surface of the spherical crown.

[0038] In one embodiment, the seat includes armrests fixed to the base and / or the backrest, the armrests preferably being detachable, i.e., removable without tools.

[0039] For example, each handrail may include an arm configured to be installed via mechanical engagement.

[0040] In one embodiment, each handrail is foldable and / or detachable, such as snap-on and unsnap-off types.

[0041] Preferably, the height of each armrest is adjustable to fit the user's body size.

[0042] The present invention also relates to a hinge, particularly a hinge for furniture, such as a hinge for a chair or table, comprising a male locking element (e.g., whose outer circumference is gear-shaped) complementary to a female locking element (e.g., whose inner circumference is correspondingly hollow gear-shaped), such that the male locking element can be inserted into the female locking element to lock the two locking elements in the rotational direction. These locking elements are capable of locking the legs in an unfolded position for use of the chair, or in a folded position under the base.

[0043] Each hinge can be made of metal or the same material as the legs.

[0044] Preferably, the male locking element includes a circular central aperture, and the hinge includes a retaining member consisting of two parts, each part including a disk from which a cylinder extends, the two cylinders being complementary and configured to pass through the aperture and engage with each other so that the male locking element remains nested within the female locking element.

[0045] Preferably, the two cylinders of the retaining member are integral and configured to move between a retaining position and an open position, in which the disc presses against the male locking element and the female locking element to hold them in a nested position, and in the open position, the two discs separate to allow the male locking element to be disengaged from the female locking element, allowing them to rotate relative to each other, thereby enabling the leg to be folded or unfolded. Attached Figure Description

[0046] Other features and advantages of the present invention will become more apparent from the following description. The following description is merely illustrative and must be read in conjunction with the accompanying drawings, wherein: [ Figure 1 ] Figure 1 A perspective view of the chair according to the invention in its use position is shown schematically.

[0047] [ Figure 2 ] Figure 2 schematically shown Figure 1 A top view of the chair without proprioceptive elements.

[0048] [ Figure 3 ] Figure 3 schematically shown Figure 1 A three-dimensional diagram of the proprioceptive elements of the chair.

[0049] [ Figure 4 ] Figure 4 schematically shown Figure 1 The chair in the picture is in a side sectional view in its use position.

[0050] [ Figure 5 ] Figure 5 schematically shown Figure 1 A 3D view showing the chair in its storage location.

[0051] [ Figure 6 ] Figure 6 schematically shown Figure 1 The image shows a three-dimensional view taken from below when the chair is in its storage position and its legs are folded down.

[0052] [ Figure 7 ] Figure 7 An example is shown schematically where the ball crown is fixed in a stationary position on a flat bracket by a spring screw system.

[0053] [ Figure 8 ] Figure 8 schematically shown Figure 7 The fixed structure in the middle is in a tilted position for use.

[0054] [ Figure 9 ] Figure 9 An advantageous example of a seat leg hinge according to the invention is illustrated schematically.

[0055] [ Figure 10 ] Figure 10 schematically shown Figure 7 The state in which the male and female locking elements of the hinge are nested together. Detailed Implementation

[0056] Figure 1 An example of a chair-shaped orthopedic seat 1 according to the present invention is shown schematically.

[0057] chair 1 like Figure 1 As shown, the chair 1 includes a base 10, a proprioceptive element 20, multiple legs 30, and a backrest 40.

[0058] Chair 1 is configured to have a usage position, such as Figure 1 As shown, in this usage position, chair 1 unfolds, and the user can sit on it.

[0059] Chair 1 is also designed to have storage space, such as Figure 5 As shown, in this storage location, chair 1 is folded, allowing the user to store and move chair 1.

[0060] Base 10 The base 10 is in the shape of a parallelepiped and includes a lower surface 110, a front surface 120, a rear surface 130 opposite to the front surface 120, two side surfaces 140 opposite to each other and connecting the front surface 120 and the rear surface 130, and an upper surface 150 opposite to the lower surface 110.

[0061] An internal space 160 is defined inside the parallelepiped base 10.

[0062] In this example, the front surface 120 advantageously includes a handle 120A to allow easy movement of the chair 1 in its stowed position.

[0063] The base 10 includes a support portion 152 on its upper surface 150, which extends from the front surface 120, the rear surface 130 and the side surface 140 toward the center of the upper surface 150.

[0064] like Figure 2 As shown, the support portion 152 includes an edge 154 that defines a circular opening 156 centered on the upper surface 150.

[0065] The base 10 also includes a flat bracket 112 mounted on the lower surface 110, aligned with the circular opening 156, and extending from one side surface 140 to the opposite side surface 140.

[0066] Armrests may be provided and fixed to the base 10 and / or the backrest 40, preferably detachable.

[0067] For example, each handrail may include an arm configured to be installed via mechanical engagement.

[0068] Proprioceptive element 20 like Figure 3 As shown, the proprioceptive element 20 includes a crown 210 and a seat portion 220 configured to receive the buttocks of the user of the chair 1.

[0069] The spherical cap 210 includes a flat surface 211 and a spherical portion 212, the free end of which is referred to as the "pole" 213.

[0070] The spherical crown 210 partially passes through the circular opening 156, while forming a gap with the edge 154 of the circular opening 156.

[0071] like Figure 4 As shown, the spherical portion 212 containing the pole 213 rests on the flat bracket 112 of the base 10 to allow the spherical crown 210 to tilt over the area of ​​the flat bracket 112.

[0072] Advantageously, refer to Figure 7 and Figure 8The ball part 212 is fixed to the flat bracket 112 by a screw 215 with a threaded rod 215A. A spring 216 is mounted on the threaded rod. The spring can strengthen the connection while allowing the ball part 212 to tilt on the flat bracket 112, so that the user can maintain balance to correct posture.

[0073] More specifically, the head 215B of screw 215 is located below the flat bracket 112, the threaded rod 215A passes through the flat bracket and the extreme point 213 of the ball portion 212, and the nut 217 mounted on the threaded rod 215A locks the spring 216 onto the threaded rod 215A. Tightening the screw by the head 215B of screw 215 compresses or loosens the spring 216, thereby strengthening or disengaging the connection. In other words, the tension of the spring 216 can be adjusted by screwing in or out the screw to increase or decrease the tension of the spring 216, thereby ensuring that the ball portion 212 is easier or more difficult to move according to the user's weight.

[0074] The screw 215 and spring 216 system also includes a circular member 218, which includes a flat surface abutting the spring 216 and a convex surface abutting the inner surface of the ball portion 212 at its extreme point 213 (optionally via a washer, not shown for clarity), thereby allowing the ball portion 212 to tilt while providing a restoring force to return it to its initial position, i.e., an upright position, when no external force is applied. Figure 7 As shown.

[0075] exist Figure 8 In the middle, the spherical part 212 bears the eccentric weight of the user, thus tilting and causing the circular part 218 to move accordingly. At this time, the circular part 218 uses the return spring 216 to return the spherical part 212 to its original position. Figure 7 The initial position.

[0076] The seat portion 220 is plate-shaped, such as a wooden board, metal plate, or plastic plate, and optionally has a cushioning layer on its upper part to accommodate the user's buttocks.

[0077] The seat portion 220 is fixed to the flat surface 211 of the crown 210 and extends laterally from the crown 210, thereby preventing the crown 210 from tilting further at the edge of the circular opening 156 when the edge of the seat portion 220 contacts the support portion 152 at a given tilt angle.

[0078] support leg 30 like Figure 5 As shown, chair 1 includes four legs 310.

[0079] Each leg 310 is hinged to the lower surface 110 of the base 10 via a joint, in this non-limiting example, the joint taking the form of a self-locking hinge 320.

[0080] Each support leg 310 can tilt between two positions: when the chair 1 is in use, it is perpendicular to the base 10; and when the chair 1 is in storage, it is folded and rests against the lower surface 110 of the base 10.

[0081] like Figure 6 As shown, when the chair 1 is in the folded position, the support legs 310 are connected along the sides of the lower surface 110.

[0082] Because the hinge 320 is self-locking, it can keep the corresponding leg 310 folded against the lower surface 110 in the retracted position, or keep the extended leg 310 in the use position, such as... Figure 6 As shown.

[0083] Preferably, the hinge 320 has an unlocking mechanism, which the user can operate to unlock the self-locking hinge 320, thereby enabling the chair 1 to be switched from the storage position to the use position, and vice versa.

[0084] Figure 9 A preferred example of the hinge 320 for the legs 310 of the folding chair 1 is shown. Each hinge 320 may be made of metal or the same material as the legs 310.

[0085] Each hinge 320 is integrated in the leg 310 and includes a male locking element 321 with a gear-shaped outer periphery and a central opening 321A; and a female locking element 322 with a hollow gear-shaped inner periphery and a shape complementary to the male locking element 321.

[0086] like Figure 10 As shown, the male locking element 321 is configured to be inserted into the female locking element 322 by forming an interlocking connection to lock the rotation of the support leg 310, particularly in the unfolded position of the seat 1 or the folded position under the base 10.

[0087] exist Figure 9 In the example, outrigger 310 is divided into two parts: 310-A ​​and 310-2, one of which, 310-2 (in... Figure 9 (Not shown) is mounted on the lower surface 110 of the base 10. The female locking element 322 includes a mounting plate 322P fixed to the portion 310-2 of the support leg 310, and the male locking element 321 includes a mounting plate 321P fixed to the other portion 310-1 of the support leg 310.

[0088] The hinge 320 includes retaining members 323A and 323B consisting of two parts, each part 323A and 323B including a disc 323A1 and 323B1 from which cylinders 323A2 and 323B2 extend. The two cylinders 323A2 and 323B2 are complementary and configured to pass through an opening 321A and engage with each other so that the male locking element 321 is held nested in the female locking element 322, while being separable to allow the male locking element 321 to exit from the female locking element 322, thereby switching the leg 310 from a folded position to an unfolded position, and vice versa.

[0089] Preferably, the two cylinders 323A2, 323B2 of the retaining member are mounted as a permanent unit, but are configured to move between a retaining position and an open position. In the retaining position, the discs 323A1, 323B1 press against the male locking element 321 and the female locking element 322 to hold them in a nested position. In the open position, the two discs 323A1, 323B1 separate so that the male locking element 321 can be disengaged from the female locking element 322, allowing them to rotate relative to each other, thereby enabling the leg 310 to be folded or unfolded.

[0090] More preferably, the height of the outrigger 310 is adjustable, for example, through a telescopic structure.

[0091] Backrest 40 like Figure 1 As shown, the backrest 40 extends from the upper surface 150 of the base 10 to the rear surface 130 of the base 10.

[0092] like Figure 5 As shown, the backrest 40 includes two uprights 410, a resting surface 420, two joints 430 and a locking member 440.

[0093] Two connectors 430 are mounted on two columns 410, allowing the backrest 40 to be folded onto the proprioceptive element 20 when the user wishes to place the chair 1 in the storage position; and allowing the backrest 40 to be unfolded when the user wishes to place the chair 1 in the use position.

[0094] In the position of use, the backrest 40 extends in a direction substantially perpendicular to the base 10.

[0095] In the stowed position, the backrest 40 rests on the seat portion 220 of the proprioceptive element 20 and is configured to remain in that position.

[0096] The locking member 440 can lock the backrest 40 in the folded position. For example, the locking member 440 can be as follows: Figure 5 The straps shown are even hooks or buckles.

[0097] Implementation Example When the chair 1 is in the use position, the user can sit on the seat portion 220 of the proprioceptive element 20.

[0098] In this position, the proprioceptive element 20 is unstable because it rests on the flat bracket 112 only through contact with the pole 213 of the spherical portion 210. This instability forces the user to engage their deep muscles, especially those around the pelvis and spine, to maintain stability.

[0099] Therefore, Chair 1 allows users to maintain a seated posture without being static, and by changing the stress points in the lumbar and pelvic areas, it can reduce the risk of related diseases caused by prolonged static sitting.

[0100] If the user tilts the proprioceptive element 20 too much, the spherical portion 210 will contact the edge 154 of the support portion 152, thereby preventing the proprioceptive element 20 from tilting further and preventing the user from falling.

[0101] Even without a fixed connection between the pole 213 and the flat bracket 112, this also allows the spherical crown 210 to slide unimpeded on the flat bracket 112, thus providing the user with additional tilting freedom to move their pelvis.

[0102] In this usage scenario, the seat portion 220 prevents the proprioceptive element 20 from tilting by abutting against the support portion 154.

[0103] Users can place chair 1 in the storage location, which is especially convenient for storage or moving.

[0104] For this purpose, the user folds the backrest 40 via connector 430. Then, the backrest surface 420 contacts the seat portion 220, thereby locking the proprioceptive element 20 in its stowed position. The backrest 40 is then secured to the base 10 via locking member 440, as... Figure 5 and Figure 6 As shown, the locking component is a strap that hooks onto the seat portion 220, or alternatively, a hook or buckle.

[0105] The user can also fold each leg 310 onto the lower surface 110 of the base 10 using hinge 320. Hinges 320 automatically lock in this position and are able to keep the legs 310 folded under the lower surface 110.

[0106] Once the chair 1 is in its stowed position, the user can move it using the handle 120A.

[0107] To return chair 1 to its usable position, the user simply unfolds the backrest 40 and legs 310 in reverse order.

Claims

1. A posture-correcting chair (1), the chair (1) comprising a base (10) and a plurality of legs (30), the base (10) defining an interior space (160) and comprising a lower surface (110), a front surface (120), a rear surface (130) opposite to the front surface (120), two side surfaces (140) opposite to each other and connecting the front surface (120) and the rear surface (130), and an upper surface (150) opposite to the lower surface (110), the plurality of legs (30) extending from the lower surface (110) of the base (10), and a backrest (40) extending from the upper surface (150) of the base (10) to the rear surface (130) of the base (10), the chair (1) being characterized in that: The base (10) includes a flat bracket (112) on its lower surface (110) and defines a circular opening (156) on its upper surface (150). The seat (1) also includes a proprioceptive element (20) comprising a seat portion (220) and a crown (210), the seat portion (220) being configured to receive the buttocks of a user of the seat (1), the crown (210) partially passing through the circular opening (156) while forming a gap with the edge (154) of the circular opening (156), and the spherical portion (212) of the crown (210) including the pole (213) resting on the flat bracket (112) to allow the crown (210) to tilt on the surface of the flat bracket (112).

2. The seat (1) according to claim 1, comprising a screw (215) with a threaded rod (215A), a spring (216) mounted on the threaded rod and locked by a nut (217) screwed onto the threaded rod (215A), the head (215B) of the screw (215) being located below the flat bracket (112), the threaded rod (215A) passing through the flat bracket (112) and the spherical portion (212) of the crown (210) at its extreme point (213).

3. The seat (1) according to claim 2 further includes a circular component (218) comprising a flat surface mounted against the spring (216) and a convex surface against the inner surface of the spherical portion (212) at its extreme point (213).

4. The seat (1) according to any one of the preceding claims, the seat (1) comprising a backrest (40) pivotally mounted between a use position and a storage position, wherein the backrest (40) is unfolded in the use position and folded in the storage position.

5. The seat (1) according to the preceding claim, wherein, The backrest (40) includes at least one locking member (440) capable of locking the backrest (40) in the storage position.

6. The seat (1) according to any one of claims 4 or 5, wherein, In the storage position, the backrest (40) folds over the proprioceptive element (20) to hold it in the base (10).

7. The seat (1) according to any one of claims 4 to 6, wherein, The backrest (40) is hinged to the base (10) via a hinged connector (420).

8. The seat (1) according to any one of the preceding claims, wherein, Each of the multiple legs (30) is hinged to the lower surface (110) of the base (10) and can be switched between the use position and the storage position, in the use position the leg (310) is unfolded and in the storage position the leg (310) is folded.

9. The seat (1) according to the preceding claim, wherein, Each of the plurality of legs (30) is connected to the lower surface (110) of the base (10) via a self-locking hinge joint (320).

10. The seat (1) according to the preceding claim, wherein, In the storage position, each of the plurality of legs (310) is folded and rests against the lower surface (110) of the base (10).

11. The seat (1) according to any one of the preceding claims, wherein, The seat portion (220) includes a bracket fixed to a flat surface (211) of the crown (210), the bracket extending above the edge (154) defining the circular opening (156).

12. The seat (1) according to any one of the preceding claims, wherein, A handle (120A) is provided on one of the front surface (120), the rear surface (130) and the two side surfaces (140).

Images