Lifting chair leg for seat and seat

Abstract

The utility model discloses a lifting chair leg for seat and seat, including first support foot stand, second support foot stand and connecting seat, the connecting seat is used for fixed installation with the seat of seat, the first support foot stand includes first free end and first connecting end opposite to first free end, the second support foot stand includes second free end and second connecting end opposite to first free end. The second supporting foot stand comprises a second free end and a second connecting end opposite to the second free end, the first free end and the second free end are used for making contact with the ground, the first connecting end is pivoted to the second connecting end, and the connecting base is arranged at the first connecting end; the lifting chair leg further comprises a driving assembly connected with the connecting base, the driving assembly can drive the connecting base to ascend and descend so that the connecting base can have an ascending stroke and a descending stroke, in the ascending stroke, the connecting base can drive the first free end and the second free end to be close to each other, and in the descending stroke, the connecting base can drive the second free end to be close to each other. The connecting base can drive the first free end and the second free end to be away from each other. The lifting operation of the chair legs is simple.

Description

Technical Field

[0001] This utility model relates to the field of seating technology, specifically to a height-adjustable chair leg and a seat. Background Technology

[0002] With the continuous optimization of modern office environments and the increasing demands for quality of life, height-adjustable chairs, as devices that can adjust seat height according to user needs, have gradually become common in offices, home studies, and various public spaces. Height-adjustable chairs provide a more comfortable and healthier sitting experience for users of different heights and body types through flexible seat height adjustment, while also helping to improve work efficiency and quality of life.

[0003] While most existing height-adjustable chairs can achieve seat height adjustment by raising and lowering the chair legs, the operation is cumbersome and often requires the coordinated operation of multiple components to complete the lifting action. Utility Model Content

[0004] The purpose of this utility model is to provide a height-adjustable chair leg and a chair for use as a seat, the height adjustment of which is simple.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A height-adjustable chair leg for a seat includes a first support leg, a second support leg, and a connecting seat. The connecting seat is used for fixed installation with the seat. The first support leg includes a first free end and a first connecting end opposite to the first free end. The second support leg includes a second free end and a second connecting end opposite to the second free end. The first free end and the second free end are used to contact the ground. The first connecting end and the second connecting end are pivotally connected. The connecting seat is disposed at the first connecting end. The height-adjustable chair leg also includes a drive assembly connected to the connecting seat. The drive assembly can drive the connecting seat to rise and fall, so that the connecting seat has an upward stroke and a downward stroke. In the upward stroke, the connecting seat can drive the first free end and the second free end to move closer to each other. In the downward stroke, the connecting seat can drive the first free end and the second free end to move further apart.

[0007] Preferably, the drive assembly includes a first link, a second link, and a telescopic rod that extends and retracts in a predetermined direction;

[0008] The first link includes a first arm and a second arm with an included angle. The first arm is fixedly connected to the telescopic rod so that the first link reciprocates along the set direction. The second arm is hinged to the second link and the two form a V-shape. The second link includes a rotating end and a fixed end disposed opposite to the rotating end. The fixed end is fixedly connected to both the connecting seat and the second arm. The rotating end is rotatably disposed on the second support leg.

[0009] When the telescopic rod extends, it causes the first connecting rod to move away from the second connecting rod, thereby causing the fixed end to descend and the connecting seat to descend. When the telescopic rod retracts, it causes the first connecting rod to move closer to the second connecting rod, thereby causing the fixed end to rise and the connecting seat to rise.

[0010] Preferably, the connecting seat is fixed to the first connecting end so that the connecting seat is linked with the first support leg;

[0011] When the connecting seat performs the upward stroke, it can cause the first connecting end to tend to move away from the second support leg, so that the first free end moves closer to the second free end; when the connecting seat performs the downward stroke, it can cause the first connecting end to tend to move closer to the second support leg, so that the first free end moves away from the second free end.

[0012] Preferably, the second support bracket includes a mounting cavity and a detachable cover plate. The first connecting rod, the second connecting rod, and the telescopic rod are all installed in the mounting cavity. The upper end of the mounting cavity has an opening, and the connecting seat and the cover plate together close the opening.

[0013] Preferably, guide blocks are respectively provided on opposite sides of the mounting cavity, and the two guide blocks define a guide channel. The first arm of the first connecting rod is installed in the guide channel to limit the movement trajectory of the first connecting rod. The end of the first arm and the end of the telescopic rod are fixedly connected by a connecting shaft. The guide block is provided with a groove along the extension direction of the guide channel. The two ends of the connecting shaft are respectively inserted into the corresponding grooves and move along the grooves.

[0014] Preferably, a clearance groove is formed in the middle of the first arm portion along the axial direction of the telescopic rod, the telescopic rod portion is embedded in the clearance groove, and the connecting shaft passes through the first arm portion and the telescopic rod.

[0015] Preferably, the drive assembly further includes a fixing block for fixing the telescopic rod and an actuator for driving the telescopic rod to extend or retract, wherein the telescopic rod is a telescopic lead screw and the actuator is a knob or handle.

[0016] Preferably, the upper end of the connecting seat is provided with an adapter that is fixedly connected to the seat of the chair, and the adapter is detachably connected to the connecting seat.

[0017] Preferably, the first free end and / or the second free end are provided with rollers.

[0018] In addition, to achieve the above objectives, the present invention also adopts the following technical solution:

[0019] A seat, including the aforementioned adjustable chair legs.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] The chair seat is lowered by driving the connecting seat, which is fixedly mounted to the chair seat, through a drive assembly. During its upward stroke, the connecting seat moves the first and second free ends closer together, raising their height and thus increasing the height of the connecting seat. Conversely, during its downward stroke, the connecting seat moves the first and second free ends apart, lowering their height and thus decreasing the height of the connecting seat. The drive assembly controls the raising and lowering of the connecting seat to achieve flexible height adjustment, greatly simplifying the operation process and providing a wide range of travel for seat height adjustment, fully meeting the diverse needs of different users. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a height-adjustable chair leg provided in an embodiment of this application;

[0023] Figure 2 for Figure 1 An explosion diagram;

[0024] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0025] Figure 4 A cross-sectional view of a height-adjustable chair leg provided in an embodiment of this application;

[0026] Figure 5 This is a partial structural diagram of an embodiment of this application.

[0027] Among them, 1. First support leg; 11. First free end; 12. First connecting end; 121. Rotating shaft; 2. Second support leg; 21. Second free end; 22. Second connecting end; 23. Mounting cavity; 231. Opening; 232. Guide block; 2321. Slide groove; 24. Cover plate; 3. Connecting seat; 4. Drive assembly; 41. First connecting rod; 411. First arm; 4111. Relief groove; 412. Second arm; 42. Second connecting rod; 421. Rotating end; 422. Fixed end; 43. Telescopic rod; 44. Connecting shaft; 45. Fixing block; 46. Actuator; 5. Adapter. Detailed Implementation

[0028] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. Unless otherwise specified, the materials and equipment used in this embodiment are all commercially available. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0029] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected," "linked," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a connection through an intermediary, or a connection within two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] like Figures 1 to 4As shown, this embodiment provides a height-adjustable chair leg for a seat, including a first support leg 1, a second support leg 2, and a connecting seat 3. The connecting seat 3 is used for fixed installation with the seat. The first support leg 1 includes a first free end 11 and a first connecting end 12 opposite to the first free end 11. The second support leg 2 includes a second free end 21 and a second connecting end 22 opposite to the second free end 21. The first free end 11 and the second free end 21 are in contact with the ground. The first connecting end 12 and the second connecting end 22 are pivotally connected. The connecting seat 3 is disposed on the first connecting end 12. The height-adjustable chair leg also includes a drive assembly 4 connected to the connecting seat 3. The drive assembly 4 can drive the connecting seat 3 to rise and fall so that the connecting seat 3 has an upward stroke and a downward stroke. In the upward stroke, the connecting seat 3 can drive the first free end 11 and the second free end 21 to move closer to each other. In the downward stroke, the connecting seat 3 can drive the first free end 11 and the second free end 21 to move further apart from each other.

[0032] In this embodiment, the first support leg 1 includes a first connecting end 12 and a first free end 11 disposed opposite to each other, and the second support leg 2 includes a second connecting end 22 and a second free end 21 disposed opposite to each other. The first connecting end 12 and the second connecting end 22 are pivotally connected so that the first support leg 1 and the second support leg 2 can rotate relative to each other, so as to realize the relative movement of the first free end 11 and the second free end 21.

[0033] Specifically, the first connecting end 12 and the second connecting end 22 are pivotally connected by a rotating shaft 121. The first free end 11 and the second free end 21 are in contact with the ground, so the first connecting end 12 and the second connecting end 22 are respectively located above the first support leg 1 and the second support leg 2. The connecting seat 3 is disposed on the first connecting end 12 of the first support leg 1, that is, the connecting seat 3 is located above the first support leg 1.

[0034] The drive assembly 4 can drive the connecting seat 3 to rise and fall, giving it both an upward and downward stroke. When the connecting seat 3 rises and falls, it can also raise and lower the chair seat fixed to it, thus adjusting the chair seat height. Furthermore, during the upward stroke, the connecting seat 3 can bring the first free end 11 and the second free end 21 closer together (i.e., the first support leg 1 and the second support leg 2 retract), thereby raising the height of the first connecting end 12 and the second connecting end 22, further increasing the height of the connecting seat 3. During the downward stroke, the connecting seat 3 can move the first free end 11 and the second free end 21 away from each other (i.e., the first support leg 1 and the second support leg 2 unfold), thereby lowering the height of the first connecting end 12 and the second connecting end 22, further decreasing the height of the connecting seat 3.

[0035] The specific principle is as follows: The first support leg 1 and the second support leg 2 form a deformable triangle with the ground. The first support leg 1 and the second support leg 2 serve as the hypotenuse of the triangle. When the first free end 11 and the second free end 21 approach each other, the base of the triangle shrinks, the height of the triangle increases, and the height of the first end located at the top of the triangle also rises, and the connecting seat 3 located at the first end also rises further. Similarly, when the first free end 11 and the second free end 21 move away from each other, the base of the triangle increases, the height of the triangle decreases, the height of the first end located at the top of the triangle also decreases, and the connecting seat 3 located at the first end also decreases further. In this embodiment, two first support legs 1 are configured, and they are respectively configured on both sides of the second support leg 2.

[0036] In summary, this embodiment lowers the chair seat by driving the connecting seat 3, which is fixedly mounted to the chair seat, through the drive component 4. Furthermore, during its upward stroke, the connecting seat 3 moves the first free end 11 and the second free end 21 closer together, thereby raising the height of the first connecting end 12 and the second connecting end 22, thus further increasing the height of the connecting seat 3. Conversely, during its downward stroke, the connecting seat 3 moves the first free end 11 and the second free end 21 away from each other, thereby lowering the height of the first connecting end 12 and the second connecting end 22, thus further decreasing the height of the connecting seat 3. The drive component 4 controls the raising and lowering of the chair seat by controlling the raising and lowering of the connecting seat 3, achieving flexible adjustment of the chair seat height, greatly simplifying the operation process, and providing a large range of travel for seat raising and lowering, fully meeting the diverse needs of different users for seat height.

[0037] Combination Figures 2 to 5 As shown, the drive assembly 4 in this embodiment includes a first connecting rod 41, a second connecting rod 42, and a telescopic rod 43 that can extend and retract in a set direction, working together to achieve the lifting and lowering of the connecting seat 3. The first connecting rod 41 consists of a first arm 411 and a second arm 412 with an included angle, wherein the first arm 411 is fixedly connected to the telescopic rod 43 to ensure that the first connecting rod 41 can reciprocate in a set direction under the action of the telescopic rod 43. The second arm 412 is fixedly connected to the second connecting rod 42 by a hinge, that is, the second arm 412 and the second connecting rod 42 cannot rotate relative to each other, and the two together form a V-shaped structure, realizing the transmission and conversion of force.

[0038] The second link 42 includes a rotating end 421 and a fixed end 422. The fixed end 422 is not only tightly connected to the connecting seat 3, but also fixedly connected to the second arm 412. Therefore, the fixed end 422 can push the connecting seat 3 to rise and fall under the force applied by the second arm 412. The rotating end 421 is rotatably mounted on the second support leg 2, allowing the second link 42 to swing relative to the second support leg 2 within a certain range, thereby cooperating with the first link 41 to achieve the raising and lowering of the connecting seat 3 and the chair seat. When the telescopic rod 43 extends, it drives the first link 41 to move away from the second link 42 (i.e., rotate to the left), causing the fixed end 422 and the connected connecting seat 3 to move to the lower left, ultimately resulting in the lowering of the connecting seat 3 and the lowering of the chair seat. Conversely, when the telescopic rod 43 retracts, it drives the first link 41 to move toward the direction closer to the second link 42 (i.e., to rotate to the right), and the fixed end 422 and the connecting seat 3 rise to the upper right, resulting in the connecting seat 3 rising and the seat height increasing.

[0039] The connecting seat 3 is fixed to the first connecting end 12 so that the connecting seat 3 is linked with the first support leg 1; when the connecting seat 3 performs the upward stroke, it can drive the first connecting end 12 to have a tendency to move away from the second support leg 2 so that the first free end 11 moves closer to the second free end 21; when the connecting seat 3 performs the downward stroke, it can drive the first connecting end 12 to have a tendency to move closer to the second support leg 2 so that the first free end 11 moves away from the second free end 21.

[0040] In this embodiment, the connecting seat 3 is fixed to the first connecting end 12, ensuring a stable linkage between the connecting seat 3 and the first support leg 1. When the connecting seat 3 performs its upward stroke, it drives the first connecting end 12 to move away from the second support leg 2. Due to the lever principle, the first free end 11 opposite to the first connecting end 12 will move closer to the second free end 21, thus achieving a further smooth upward movement of the connecting seat 3. When the connecting seat 3 begins its downward stroke, it drives the first connecting end 12 to move closer to the second support leg 2. Due to the lever principle, the first free end 11 opposite to the first connecting end 12 will move away from the second free end 21, thus achieving a further downward movement of the connecting seat 3. Additionally, it should be noted that during the upward stroke of the connecting seat 3, the connecting seat 3 drives the first connecting end 12 to rise, and the second connecting end 22, which is pivotally connected to the first connecting end 12, also rises. According to the lever principle, the first connecting end 12 drives the first free end 11 to move towards the second free end 21. The second free end 21 moves towards the first free end 11 after the first connecting end 12 drives the second connecting end 22 to rise, according to the lever principle. Similarly, during the downward stroke of the connecting seat 3, the connecting seat 3 drives the first connecting end 12 to fall, and the second connecting end 22, which is pivotally connected to the first connecting end 12, also falls. According to the lever principle, the first connecting end 12 drives the first free end 11 to move away from the second free end 21. The second free end 21 moves away from the first free end 11 after the first connecting end 12 drives the second connecting end 22 to fall, according to the lever principle. Of course, in other embodiments, a driving component can also be provided to drive the second free end 21 independently.

[0041] The second support bracket 2 includes a mounting cavity 23 and a detachable cover plate 24. The first connecting rod 41, the second connecting rod 42, and the telescopic rod 43 are all installed in the mounting cavity 23. The upper end of the mounting cavity 23 has an opening 231, which is closed by the connecting seat 3 and the cover plate 24.

[0042] In this embodiment, the second support leg 2 has a mounting cavity 23, which provides installation space for key components such as the first connecting rod 41, the second connecting rod 42, and the telescopic rod 43. The upper end of the mounting cavity 23 has an opening 231, making the installation and debugging of each component more convenient. Meanwhile, to seal the opening 231 and protect the internal components from external environmental interference and damage, the second support leg 2 is also equipped with a detachable cover plate 24. Most of the connecting seat 3 is located above the opening 231, and the cover plate 24 and the connecting seat 3 together seal the opening 231.

[0043] Guide blocks 232 are respectively provided on opposite sides of the mounting cavity 23. The two guide blocks 232 define a guide channel. The first arm 411 of the first connecting rod 41 is installed in the guide channel to limit the movement trajectory of the first connecting rod 41. The end of the first arm 411 and the end of the telescopic rod 43 are fixedly connected by a connecting shaft 44. The guide block 232 is provided with a groove 2321 along the extension direction of the guide channel. The two ends of the connecting shaft 44 are respectively inserted into the corresponding groove 2321 and move along the groove 2321.

[0044] In this embodiment, two guide blocks 232 are symmetrically arranged on opposite sides of the mounting cavity 23. The two guide blocks 232 together define a linear guide channel. This guide channel provides a movement path for the first arm 411 of the first connecting rod 41, ensuring its stability and accuracy throughout the lifting process. The end of the first arm 411 and the end of the telescopic rod 43 are fixedly connected by a connecting shaft 44. Slots 2321 are formed on the surfaces of the two guide blocks 232 along the extending direction of the guide channel. The size and shape of the two slots 2321 match the size of the connecting shaft 44, allowing both ends of the connecting shaft 44 to be inserted into the corresponding slots 2321 and move smoothly along the trajectory of the slots 2321; that is, the movable length of the first arm 411 is consistent with the length of the slot 2321.

[0045] like Figure 3 He Ru Figure 5 As shown, a relief groove 4111 is provided in the middle of the first arm 411 along the axial direction of the telescopic rod 43, and the telescopic rod 43 is partially embedded in the relief groove 4111. The connecting shaft 44 passes through the first arm 411 and the telescopic rod 43.

[0046] In this embodiment, a clearance groove 4111 is formed in the middle of the first arm 411 of the first connecting rod 41 along the axial direction of the telescopic rod 43. Part of the telescopic rod 43 is embedded in the clearance groove 4111. The connecting shaft 44 passes through the side wall of the clearance groove 4111, the telescopic rod 43, and the other side wall of the clearance groove 4111 in sequence, thereby achieving a tight fit between the two.

[0047] The drive assembly 4 also includes a fixing block 45 for fixing the telescopic rod 43 and an actuator 46 for driving the telescopic rod 43 to extend or retract. The telescopic rod 43 is a telescopic lead screw, and the actuator 46 is a knob or handle.

[0048] In this embodiment, the fixing block 45 is installed in the mounting cavity 23 to fix the telescopic rod 43. To drive the telescopic rod 43 to extend or retract, this embodiment also provides an actuator 46, which can be in the form of a knob or handle. The user can conveniently drive the telescopic rod 43 to extend or retract by rotating or operating the actuator 46. Specifically, the telescopic rod 43 is a telescopic lead screw, and the cooperation between the actuator 46 and the telescopic lead screw, as well as the specific structure of the telescopic lead screw, are existing technologies and will not be described further here. Alternatively, in other embodiments, the telescopic rod 43 can also be a piston rod of a cylinder.

[0049] The upper end of the connecting seat 3 is provided with an adapter 5 that is fixedly connected to the seat of the chair. The adapter 5 and the connecting seat 3 are detachably connected.

[0050] In this embodiment, an adapter 5 is installed at the upper end of the connecting seat 3 to achieve a fixed connection between the chair leg and the seat, thereby ensuring that the seat can rise and fall smoothly as the connecting seat 3 moves.

[0051] The first free end 11 and / or the second free end 21 are provided with rollers.

[0052] In this embodiment, rollers are provided on both the first free end 11 and the second free end 21, which not only improves the mobility and stability of the seat lifting mechanism, but also reduces noise during the lifting process. In other embodiments, rollers may be provided only on the first free end 11 or the second free end 21.

[0053] This embodiment also provides a seat, including chair legs and a seat mounted on the chair legs, wherein the chair legs are the aforementioned adjustable chair legs.

[0054] Finally, it should be noted that the above embodiments are only optional embodiments of this utility model and should not be used to limit the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A height-adjustable chair leg for a seat, characterized in that, The chair includes a first support leg, a second support leg, and a connecting seat. The connecting seat is used for fixed installation with the seat of the chair. The first support leg includes a first free end and a first connecting end opposite to the first free end. The second support leg includes a second free end and a second connecting end opposite to the second free end. The first free end and the second free end are used to contact the ground. The first connecting end and the second connecting end are pivotally connected. The connecting seat is disposed on the first connecting end. The adjustable chair leg also includes a drive assembly connected to the connecting seat. The drive assembly can drive the connecting seat to rise and fall so that the connecting seat has an upward stroke and a downward stroke. In the upward stroke, the connecting seat can drive the first free end and the second free end to move closer to each other. In the downward stroke, the connecting seat can drive the first free end and the second free end to move further apart from each other.

2. The adjustable chair leg according to claim 1, characterized in that, The drive assembly includes a first link, a second link, and a telescopic rod that extends and retracts in a set direction; The first link includes a first arm and a second arm with an included angle. The first arm is fixedly connected to the telescopic rod so that the first link reciprocates along the set direction. The second arm is hinged to the second link and the two form a V-shape. The second link includes a rotating end and a fixed end disposed opposite to the rotating end. The fixed end is fixedly connected to both the connecting seat and the second arm. The rotating end is rotatably disposed on the second support leg. When the telescopic rod extends, it causes the first connecting rod to move away from the second connecting rod, thereby causing the fixed end to descend and the connecting seat to descend. When the telescopic rod retracts, it causes the first connecting rod to move closer to the second connecting rod, thereby causing the fixed end to rise and the connecting seat to rise.

3. The adjustable chair legs according to claim 2, characterized in that, The connecting seat is fixed to the first connecting end so that the connecting seat is linked with the first support leg; When the connecting seat performs the upward stroke, it can cause the first connecting end to tend to move away from the second support leg so that the first free end moves closer to the second free end; when the connecting seat performs the downward stroke, it can cause the first connecting end to tend to move closer to the second support leg so that the first free end moves away from the second free end.

4. The adjustable chair legs according to claim 2, characterized in that, The second support bracket includes a mounting cavity and a detachable cover plate. The first connecting rod, the second connecting rod, and the telescopic rod are all installed in the mounting cavity. The upper end of the mounting cavity has an opening, and the connecting seat and the cover plate together close the opening.

5. The adjustable chair leg according to claim 4, characterized in that, Guide blocks are respectively provided on opposite sides of the mounting cavity, and the two guide blocks define a guide channel. The first arm of the first connecting rod is installed in the guide channel to limit the movement trajectory of the first connecting rod. The end of the first arm and the end of the telescopic rod are fixedly connected by a connecting shaft. The guide block has a sliding groove along the extension direction of the guide channel. The two ends of the connecting shaft are respectively inserted into the corresponding sliding groove and move along the sliding groove.

6. The adjustable chair leg according to claim 5, characterized in that, A clearance groove is provided in the middle of the first arm along the axial direction of the telescopic rod, and the telescopic rod is partially embedded in the clearance groove. The connecting shaft passes through the first arm and the telescopic rod.

7. The adjustable chair leg according to claim 2, characterized in that, The drive assembly further includes a fixing block for fixing the telescopic rod and an actuator for driving the telescopic rod to extend or retract. The telescopic rod is a telescopic lead screw, and the actuator is a knob or handle.

8. The adjustable chair leg according to any one of claims 1-7, characterized in that, The upper end of the connecting seat is provided with an adapter that is fixedly connected to the seat of the chair, and the adapter is detachably connected to the connecting seat.

9. The adjustable chair leg according to any one of claims 1-7, characterized in that, The first free end and / or the second free end are provided with rollers.

10. A type of seat, characterized in that, It includes the adjustable chair legs as described in any one of claims 1-9.

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