Healthcare chair with movable seat surface

Abstract

The utility model discloses a health care chair with a movable seat surface, which comprises the seat surface and a human body supporting device, and the seat surface consists of a left seat panel and a right seat panel which are respectively contacted with two buttocks. The left seat panel and the right seat panel are connected with a first driving mechanism capable of realizing that one of the two buttocks sits on the left seat panel or the right seat panel and the other buttock sits in the air, and the human body supporting devices are positioned on two sides or the back surface of the seat surface to support a human body trunk, so that the human body trunk is prevented from inclining towards the suspended buttocks; the human body supporting device of the health-care chair supports the human body trunk, so that the human body trunk is prevented from inclining towards the suspended side of the buttocks.

Description

Technical Field

[0001] This utility model relates to health care equipment, and in particular to a health care chair with a movable seat. Background Technology

[0002] In modern society, prolonged sitting has become the norm for many people. Whether working long hours in the office or lounging on the sofa at home watching TV or scrolling through our phones, we unknowingly spend a significant amount of time sitting. Prolonged sitting puts continuous pressure on the areas where the body contacts the chair, hindering blood circulation and potentially leading to cardiovascular disease, metabolic problems, and musculoskeletal issues. This has led to the development of various massage chairs, offering kneading, tapping, and tuina massage techniques. One such massage chair, patented as a health chair with a movable seat that allows leg movement while seated, has the publication number CN 117918659. A, it includes a seat surface, which consists of a left seat panel and a right seat panel that respectively contact the two buttocks. A drive mechanism is connected to the left and right seat panels, allowing one buttock to sit on the left or right seat panel while the other is suspended. Under the action of the drive mechanism, the buttocks can be fully seated on the seat surface, with the left buttock on the left seat panel and the right buttock suspended, or vice versa. When suspended, the buttocks are relaxed. These three methods alternate, massaging and exercising the tendons around the pelvis and lumbar vertebrae, effectively solving the technical problems of poor blood circulation and blocked meridians after prolonged sitting. However, when one buttock is seated on the left or right seat panel while the other is suspended, the body tends to tilt towards the suspended side, leading to excessive body movement and affecting concentration. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a health chair with an movable seat, which can solve the technical problems mentioned in the background art.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A movable seat health chair includes a seat and a human body support device. The seat consists of a left seat panel and a right seat panel that respectively contact the two buttocks. A first drive mechanism is connected to the left and right seat panels to enable one of the two buttocks to sit on the left or right seat panel while the other is suspended. The human body support device is located on both sides or the back of the seat to support the human torso and prevent the human torso from tilting towards the side where the buttocks are suspended.

[0006] Furthermore, it also includes a first support base and a control system. The first support base is equipped with a seat, a left armrest and a right armrest. The seat is located between the left armrest and the right armrest. The human body support device is a lumbar support mechanism. The lumbar support mechanism is respectively set on the opposite side of the left armrest and the right armrest. The lumbar support mechanism rests against the lumbar side when the buttocks are suspended. The control system is connected to the first drive mechanism and the lumbar support mechanism.

[0007] Furthermore, the lumbar support mechanism includes a telescopic device, with a top cushion connected to the telescopic end of the telescopic device, and the telescopic device is connected to a control system.

[0008] Furthermore, the lumbar support mechanism includes an airbag, which is connected to an inflation pump, and the inflation pump is connected to a control system.

[0009] Furthermore, it also includes a chair back connected to a first support seat. The chair back includes a second support seat, on which a back panel is provided. The back panel consists of a left back panel, a spinal support panel, and a right back panel that respectively contact the left, middle, and right sides of the back. A second drive mechanism is connected between the left back panel, the spinal support panel, and the right back panel and the second support seat, enabling two parts of the left, middle, and right sides of the back to rest against the back panel while the other part is suspended. The second drive mechanism is connected to a control system.

[0010] Furthermore, the second drive mechanism drives the left and right back panels to move up and down or flip back and forth around the hinge point with the back of the chair on the side of the body contact as the reference plane, and drives the spine support panel to move up and down with the back of the chair on the side of the body contact as the reference plane.

[0011] Furthermore, the second drive mechanism includes three sets of telescopic mechanisms, which are respectively connected between the left back panel and the second support seat, between the spine support panel and the second support seat, and between the right back panel and the second support seat, so as to realize the up and down movement of the left back panel, the spine support panel and the right back panel with the back of the chair on the side in contact with the body as the reference plane.

[0012] Furthermore, the second support includes a frame located outside the back panel. One side of the left and right back panels is movably connected to the frame via a hinge axis. The second drive mechanism drives the left and right seat panels to reciprocate around the hinge axis. The second drive mechanism drives the spinal support panel to move up and down with the back of the chair on the body contact side as the reference plane.

[0013] Furthermore, the second drive mechanism includes three sets of telescopic mechanisms, one set of which is hinged at the upper end to the left back panel and at the lower end to the second support seat, another set of which is hinged at the upper end to the spine support panel and at the lower end to the second support seat, and yet another set of which is hinged at the upper end to the right back panel and at the lower end to the second support seat.

[0014] Furthermore, the second drive mechanism includes two sets of rotating mechanisms and one set of telescopic mechanisms. The two sets of rotating mechanisms are fixed on the second support base and are respectively connected to the hinge shafts of the left back panel and the right back panel. The telescopic mechanism is disposed between the spinal support panel and the second support base.

[0015] The beneficial effects of this utility model are:

[0016] The movable seat health chair proposed in this utility model can achieve the following three movement modes under the action of the first drive mechanism: 1. The human buttocks sit on the seat surface; 2. The left lobe sits on the left seat panel while the right lobe is suspended; 3. The right lobe sits on the right seat panel while the left lobe is suspended. The alternating suspension of the buttocks can relieve and relax the pressure on the blood vessels. At the same time, the above three movement modes can also enable the person to achieve a movement mode similar to alternating walking when sitting.

[0017] To prevent body tilting caused by the buttocks being unsupported, a body support device is further installed. This device can support the back or waist. If the back is leaning against the chair back, it can be supported by the supportive backrest. If sitting upright, the waist support mechanism can be selected. When the right buttock is unsupported, the right waist support mechanism moves to the right side to support the right waist. When the left buttock is unsupported, the left waist support mechanism moves to the left side to support the left waist. This waist support mechanism not only reduces the amplitude of body swaying and minimizes the impact of body tilting on the seated position, but also presses on the waist muscles.

[0018] Furthermore, given the diverse configurations of existing chairs, many of which feature backrests, and the fact that the backrest angle is already highly adjustable for naps, a functional design has been implemented for the backrest to enhance its health benefits. This design incorporates a second support seat, a left back panel, a spinal support panel, a right back panel, and a second drive mechanism. Under the action of the second drive mechanism, the back can move in four different ways: 1. Fully against the back panel; 2. Left and middle back against the back panel while the right back is unsupported; 3. Middle and right back against the back panel while the left back is unsupported; 4. Right and left back against the back panel while the middle back is unsupported. This unsupported movement allows the back muscles to relax. These four movements alternate, enabling the left, middle, and right sides of the back to relax alternately while seated, thus preventing prolonged pressure on specific areas of the back that could obstruct blood circulation.

[0019] When the second drive mechanism consists of three sets of telescopic mechanisms, one set of telescopic mechanisms retracts and moves the back panel on that telescopic mechanism downward, thereby relaxing the back area corresponding to that back panel, while the remaining back panels support the back.

[0020] When the left and right back panels are hinged to the frame of the second support and the second drive mechanism is a three-stage telescopic mechanism, when the telescopic mechanism connected to the left or right back panel retracts, the left or right back panel flips downward around its hinge axis, and when the telescopic mechanism connected to the spine support panel retracts, the spine support panel moves downward.

[0021] When the left and right back panels are hinged to the frame of the second support and the drive mechanism includes two sets of rotating mechanisms and one set of telescopic mechanisms, the two sets of rotating mechanisms respectively rotate the left and right back panels around their corresponding hinge axes.

[0022] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained from the following description and claims. Attached Figure Description

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the following will describe this utility model in further detail with reference to the accompanying drawings, wherein:

[0024] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model.

[0025] Figure 2 for Figure 1 A schematic diagram of the cross-section of the middle seat panel arranged in the first support seat.

[0026] Figure 3 for Figure 1 A schematic diagram of the cross-section of the middle back panel arranged in the second support.

[0027] Figures 4-6 This is a schematic diagram showing the state of each part of the back panel after movement.

[0028] Figure 7 This is a schematic diagram of the structure of Embodiment 2 of this utility model.

[0029] Figure 8 for Figure 7 A schematic diagram of the cross-section of the middle seat panel arranged in the first support seat.

[0030] Figure 9 for Figure 7 A schematic diagram of the cross-section of the middle back panel arranged in the second support.

[0031] Figure 10 This is a schematic diagram of the structure of Embodiment 4 of this utility model.

[0032] In the diagram: First support seat 1, Second support seat 2, Left seat panel 3, Right seat panel 4, Lifting mechanism 5, Left armrest 6, Right armrest 7, Telescopic device 8, Top cushion 9, Left back panel 10, Spine support panel 11, Right back panel 12, Telescopic mechanism 13, Hinge shaft 14, Airbag 15. Detailed Implementation

[0033] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0034] Example 1

[0035] like Figure 1-6The movable seat health chair shown consists of a first support seat 1 and a backrest that are hinged together. A backrest angle adjustment mechanism is provided between the first support seat and the backrest. Chair legs are provided under the first support seat 1. The first support seat 1 includes a horizontal plate. A left side plate extending upward is vertically connected to the left side of the horizontal plate, and a right side plate extending upward is vertically connected to the right side of the horizontal plate. The backrest includes a second support seat 2. The second support seat 2 includes an inclined plate. A left side guard plate extending upward is vertically connected to the left side of the inclined plate, and a right side guard plate extending upward is vertically connected to the right side of the inclined plate. The first support seat 1 is provided with a seat surface, which is composed of a left seat panel 3 and a right seat panel 4 that respectively contact the two buttocks. A set of vertical lifting mechanisms 5 is connected between the left seat panel 3 and the first support seat 1, and a set of vertical lifting mechanisms 5 is also connected between the right seat panel 4 and the first support seat 1. The two sets of lifting mechanisms 5 constitute the first driving mechanism. The two sets of lifting mechanisms 5 can enable one of the two buttocks to sit on the left seat panel 3 or the right seat panel 4 while the other is suspended. Each set of lifting mechanisms 5 includes two electric telescopic rods, hydraulic cylinders or pneumatic cylinders. The first support seat 1 has a left armrest 6 and a right armrest 7 on the left and right sides of the upper panel, respectively. The left armrest 6 and the right armrest 7 are respectively provided with waist support mechanisms on the opposite sides. The waist support mechanism includes a telescopic device 8 for the vertical armrest. The telescopic end of the telescopic device 8 is connected to a top cushion 9. When the left hip is suspended, the top cushion on the left armrest rests against the left waist. When the right hip is suspended, the top cushion on the right armrest rests against the right waist. This can prevent the human torso from tilting when the hip is suspended in a sitting position. The telescopic device 8 is an electric telescopic rod, a hydraulic cylinder or a pneumatic cylinder. The top cushion 9 is a support block with a sponge pad on the side facing the human body. The second support base 2 is equipped with a back panel, which consists of a left back panel 10, a spinal support panel 11, and a right back panel 12, which respectively contact the left, middle, and right sides of the back. A telescopic mechanism 13 is connected between the left back panel 10 and the second support base 2, as are the telescopic mechanisms 13 between the spinal support panel 11 and the second support base 2, and the right back panel 12 and the second support base 2. All three telescopic mechanisms 13 are perpendicular to the inclined plate of the second support base 2. The three telescopic mechanisms 13 constitute a second drive mechanism that allows two parts of the left, middle, and right sides of the back to rest against the back panel while the other part is suspended. The telescopic mechanism 13 is an electric telescopic rod, a hydraulic cylinder, or a pneumatic cylinder. This embodiment also includes a control system, which is connected to the lifting mechanism 5, the telescopic device 8, and the telescopic mechanism 13.

[0036] In this embodiment, when in use, the person sits on the seat panel with the left hip contacting the left seat panel 3 and the right hip contacting the right seat panel 4. The back rests against the chair back, with the left side of the back in contact with the left back panel 10, the middle of the back in contact with the spine support panel 11, and the right side of the back in contact with the right back panel 12. The control system controls the extension of the left telescopic device 8 to support the left side of the waist with the left top cushion 9, and controls the lowering mechanism 5 of the left side to lower the left seat panel 3. The lowering of the left seat panel 3 suspends the left hip while the right hip sits on the right seat panel 4. Then, the control system controls the left lifting mechanism 5 to rise, raising the left seat panel 3, and controls the extension of the left telescopic device 8 to shorten the left top cushion 9 away from the left side of the waist. Afterward, the control system controls the extension of the right telescopic device 8 to support the right side of the waist with the right top cushion 9, and controls the lowering mechanism 5 of the right side to lower the right seat panel 4. The right seat panel 4 lowers, suspending the right hip lobe while the left hip lobe sits on the left seat panel 3. This alternating suspension of the hips relieves pressure on the blood vessels and allows the person to move in a similar manner to alternating leg movements while seated. Additionally, when the right hip lobe is suspended, the right telescopic device 8 extends, providing support for the right side of the lower back with its top cushion 9; conversely, when the left hip lobe is suspended, the left telescopic device 8 extends, providing support for the left side of the lower back with its top cushion 9. This prevents the body from tilting when the hips are suspended, and the top cushion 9 also provides pressure on the muscles of the side of the lower back. Figure 3-6 As shown, the control system also controls the left telescopic mechanism 13 to retract, causing the left back panel 10 to descend, so that the left side of the back is suspended while the middle of the back rests on the spinal support panel 11 and the right side of the back rests on the right back panel 12. Then, the control system controls the left telescopic mechanism 13 to extend, causing the left back panel 10 to return to its original position. After that, the control system controls the middle telescopic mechanism 13 to retract, causing the spinal support panel 11 to descend, so that the middle of the back is suspended while the left side of the back rests on the left back panel 10 and the right side of the back rests on the right back panel 12. Then, the control system controls the middle telescopic mechanism 13 to extend, causing the spinal support panel 11 to return to its original position. After that, the control system controls the right telescopic mechanism 13 to retract, causing the right back panel 12 to descend, so that the right side of the back is suspended while the left side of the back rests on the left back panel 10 and the middle of the back rests on the spinal support panel 11. Then, the control system controls the right telescopic mechanism 13 to extend, causing the right back panel 12 to return to its original position. This process repeats, allowing the body to achieve alternating relaxation of the left, middle, and right sides of the back while seated, thereby avoiding prolonged and continuous pressure on certain parts of the back that could obstruct blood circulation.

[0037] Example 2

[0038] like Figure 7-9The movable seat health chair shown consists of a first support seat 1 and a backrest that are hinged together. A backrest angle adjustment mechanism is provided between the first support seat and the backrest. Chair legs are provided under the first support seat. The first support seat includes a horizontal plate. A left side plate extending upward is vertically connected to the left side of the horizontal plate, and a right side plate extending upward is vertically connected to the right side of the horizontal plate. The backrest includes a second support seat 2. The second support seat 2 includes an inclined plate parallel to the backrest. A left side guard plate extending upward is vertically connected to the left side of the inclined plate, and a right side guard plate extending upward is vertically connected to the right side of the inclined plate. The first support base 1 is provided with a seat surface, which is composed of a left seat panel 3 and a right seat panel 4 that respectively contact the two buttocks. The upper part of the left side panel and the upper part of the right side panel of the first support base 1 form a frame located outside the seat panel. The left side of the left seat panel 3 is movably connected to the upper part of the left side panel through a hinge shaft 14, and the right side of the right seat panel 4 is movably connected to the upper part of the right side panel through a hinge shaft 14. A set of lifting mechanisms 5 is movably connected under the left seat panel 3 through a hinge shaft 14. The end of the lifting mechanism 5 is movably connected to the first support base 1 through a hinge shaft 14. A set of lifting mechanisms 5 is movably connected under the right seat panel 4 through a hinge shaft 14. The end of the lifting mechanism 5 is movably connected to the first support base 1 through a hinge shaft 14. In this embodiment, all of the above-mentioned hinge shafts 14 are parallel. The lifting mechanism 5 is an electric telescopic rod, a hydraulic cylinder, or a pneumatic cylinder. The first support seat 1 has a left armrest 6 and a right armrest 7 on the left and right sides of the upper panel, respectively. The left armrest 6 and the right armrest 7 are respectively provided with waist support mechanisms on the opposite sides. The waist support mechanism includes a telescopic device 8 for the vertical armrest. The telescopic end of the telescopic device 8 is connected to a top cushion 9. When the left hip is suspended, the top cushion on the left armrest rests against the left waist. When the right hip is suspended, the top cushion on the right armrest rests against the right waist. This can prevent the human torso from tilting when the hip is suspended in a sitting position. The telescopic device 8 is an electric telescopic rod, a hydraulic cylinder or a pneumatic cylinder. The top cushion 9 is a support block with a sponge pad on the side facing the human body. The second support base 2 is provided with a back panel, which consists of a left back panel 10, a spine support panel 11, and a right back panel 12 that respectively contact the left, middle, and right sides of the back. The left back panel 10 is movably connected to the left guard plate via a hinge shaft 14, and the right back panel 12 is movably connected to the right guard plate via a hinge shaft 14. A set of telescopic mechanisms 13 is movably connected to the lower side of the left back panel 10 via a hinge shaft 14. The end of the set of telescopic mechanisms 13 is movably connected to the second support base 2 via a hinge shaft 14. A set of telescopic mechanisms 13 is vertically fixed to the lower side of the spine support panel 11. The end of the set of telescopic mechanisms 13 is fixedly connected to the second support base 2. A set of telescopic mechanisms 13 is movably connected to the lower side of the right back panel 12 via a hinge shaft 14. The end of the set of telescopic mechanisms 13 is movably connected to the second support base 2 via a hinge shaft 14. The three sets of telescopic mechanisms 13 constitute the second drive mechanism, which can realize that two parts of the left, middle, and right sides of the back rest against the back panel, while the other part is suspended. The telescopic mechanism is an electric telescopic rod, a pneumatic cylinder, or a hydraulic cylinder.This embodiment also includes a control system, which is connected to the lifting mechanism 5, the telescopic device 8 and the telescopic mechanism 13.

[0039] This embodiment is used in the same way as Embodiment 1, except that the left seat panel 3 and the right seat panel 4 are movably connected to the left and right sides of the first support base 1 by hinge shaft 14, and the left back panel 3 and the right back panel 4 are movably connected to the left and right sides of the second support base 2 by hinge shaft 14.

[0040] Example 3

[0041] The difference from Embodiment 2 lies in the second drive mechanism. In this embodiment, the hinge shaft 14 on the left back panel 10 is connected to a set of rotating mechanisms (here, the left back panel 10 is fixedly connected to the hinge shaft 14 on it), and the hinge shaft 14 on the right back panel 12 is connected to a set of rotating mechanisms (here, the right back panel 10 is fixedly connected to the hinge shaft 14 on it). A set of telescopic mechanisms 13 is vertically fixedly connected to the lower side of the spinal support panel 11. The end of the telescopic mechanism 13 is fixedly connected to the second support seat 2. The two sets of rotating mechanisms and telescopic mechanisms 13 constitute the second drive mechanism, which can realize that two parts of the left, middle and right sides of the back rest against the back panel, and the other part is suspended. The rotating mechanism is a stepper motor, and the telescopic mechanism is an electric telescopic rod, hydraulic cylinder or pneumatic cylinder. The rotating mechanism and the telescopic mechanism are connected to the control system.

[0042] This embodiment is used in the same way as embodiment two, the only difference being that the movement of the left seat panel 3, right seat panel 4, left back panel 10 and right back panel 12 is driven by a rotating mechanism.

[0043] Example 4

[0044] like Figure 10 As shown, the difference from Embodiment 1 is that the waist support mechanism is different. The waist support mechanism of this embodiment includes an airbag 15, which is connected to an air pump. The airbag 15 is inflated by the air pump, and the airbag 150 supports the waist side. The air pump is connected to the control system.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A health chair with a movable seat, characterized in that: It includes a seat surface and a human body support device. The seat surface consists of a left seat panel (3) and a right seat panel (4) that respectively contact the two buttocks. A first drive mechanism is connected to the left seat panel (3) and the right seat panel (4) to enable one of the two buttocks to sit on the left seat panel (3) or the right seat panel (4) while the other buttock is suspended. The human body support device is located on both sides or the back of the seat surface to support the human torso and prevent the human torso from tilting to the side where the buttocks are suspended.

2. The movable seat health chair according to claim 1, characterized in that: It also includes a first support base (1) and a control system. A seat, a left armrest (6) and a right armrest (7) are installed on the first support base (1). The seat is located between the left armrest (6) and the right armrest (7). The human body support device is a waist support mechanism. The waist support mechanism is respectively set on the opposite side of the left armrest (6) and the right armrest (7). The waist support mechanism rests against the waist side when the buttocks are suspended. The control system is connected to the first drive mechanism and the waist support mechanism.

3. The movable seat health chair according to claim 2, characterized in that: The lumbar support mechanism includes a telescopic device (8), and a top cushion (9) is connected to the telescopic end of the telescopic device (8). The telescopic device (8) is connected to the control system.

4. The movable seat health chair according to claim 2, characterized in that: The lumbar support mechanism includes an airbag (15), which is connected to an inflation pump, and the inflation pump is connected to a control system.

5. The movable seat health chair according to any one of claims 1-4, characterized in that: It also includes a backrest, which is connected to a first support seat (1). The backrest includes a second support seat (2), on which a back panel is provided. The back panel consists of a left back panel (10), a spinal support panel (11), and a right back panel (12), which respectively contact the left, middle, and right sides of the back. A second drive mechanism is connected between the left back panel (10), the spinal support panel (11), and the right back panel (12) and the second support seat (2), which enables two parts of the left, middle, and right sides of the back to rest on the back panel and the other part to be suspended. The second drive mechanism is connected to the control system.

6. The movable seat health chair according to claim 5, characterized in that: The second drive mechanism drives the left back panel (10) and the right back panel (12) to move up and down or flip around the hinge point with the back of the chair on the side of the body contact as the reference plane, and drives the spinal support panel (11) to move up and down with the back of the chair on the side of the body contact as the reference plane.

7. The movable seat health chair according to claim 6, characterized in that: The second drive mechanism includes three sets of telescopic mechanisms (13), which are respectively connected between the left back panel (10) and the second support seat (2), between the spine support panel (11) and the second support seat (2), and between the right back panel (12) and the second support seat (2), so as to realize the up and down movement of the left back panel, the spine support panel and the right back panel with the back of the chair on the body contact side as the reference plane.

8. The movable seat health chair according to claim 6, characterized in that: The second support seat (2) includes a frame located outside the back panel. One side of the left back panel (10) and the right back panel (12) are movably connected to the frame via a hinge shaft (14). The second drive mechanism drives the left seat panel (3) and the right seat panel (4) to reciprocate around the hinge shaft (14). The second drive mechanism drives the spinal support panel (11) to move up and down with the back of the chair on the body contact side as the reference plane.

9. The movable seat health chair according to claim 8, characterized in that: The second drive mechanism includes three sets of telescopic mechanisms (13), one set of telescopic mechanisms (13) is hinged at the upper end to the left back panel (10) and at the lower end to the second support seat (2), one set of telescopic mechanisms (13) is hinged at the upper end to the spine support panel (11) and at the lower end to the second support seat (2), and one set of telescopic mechanisms (13) is hinged at the upper end to the right back panel (12) and at the lower end to the second support seat (2).

10. The movable seat health chair according to claim 8, characterized in that: The second drive mechanism includes two sets of rotating mechanisms and one set of telescopic mechanisms (13). The two sets of rotating mechanisms are fixed on the second support base (2) and are respectively connected to the hinge shafts (14) of the left back panel (10) and the right back panel (12). The set of telescopic mechanisms (13) is arranged between the spinal support panel (11) and the second support base (2).

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