CN223169418U - An electric chair - Google Patents

Abstract

The utility model relates to the technical field of furniture, in particular to an electric chair, which comprises a base, a backrest massage backrest bag and a pumping device, wherein the backrest is arranged on the base, the backrest massage backrest bag is detachably arranged on the backrest, the backrest massage backrest bag comprises a back massage air bag and a waist support massage air bag, and the back massage air bag and the waist support massage air bag are both communicated with the pumping device. The back massage air bag and the waist support massage air bag are integrated in the back massage backrest bag, and the back massage backrest bag is detachably arranged relative to the backrest, so that the production process of the electric chair and the massage module can be simplified, the back massage backrest bag is convenient to maintain in the later period, the flexibility is higher, and the use is more convenient. In particular, due to the detachable design of the back massage backrest, a user can selectively mount and dismount the back massage backrest to meet different use requirements.

Description

Electric chair

Technical Field

The utility model relates to the technical field of furniture, in particular to an electric chair.

Background

Office chairs are chairs which are provided for convenience in daily work and social activities, and office chairs in a narrow sense are back chairs which are used for sitting when a person performs a desk work in a sitting posture. Office chairs generally comprise casters, chair legs, air bars, chassis, seat, armrests, chair back seat connection, chair back, lumbar pillow, headrest and other structures. The existing office chairs generally have the functions of moving, rotating, backrest adjusting, leg supporting and the like. Along with the continuous improvement of the living standard of people, the requirements of people on office chairs are also higher and higher, and the office chairs with electric adjustment are more and more popular with people. The existing electric office chairs have the functions of back massage besides the functions of electrically adjusting the backrest, electrically stretching leg support and the like, but the massage modules are embedded into the backrest, so that the production process is complex, the later maintenance is inconvenient and the flexibility is poor.

Disclosure of utility model

The utility model aims to provide an electric chair, which aims to solve the technical problems that the production process of the electric chair with a massage module in the prior art is complex, the later maintenance of the massage module is inconvenient and the flexibility is poor.

In order to achieve the aim, the utility model provides an electric chair, which comprises a base, a backrest massage backrest bag and a pumping device, wherein the backrest is arranged on the base, the backrest massage backrest bag is detachably arranged on the backrest, the backrest massage backrest bag comprises a back massage air bag and a waist support massage air bag, and the back massage air bag and the waist support massage air bag are both communicated with the pumping device.

Preferably, the back massage backrest further comprises a headrest soft bag and a headrest lifting air bag, wherein the headrest lifting air bag is communicated with the air pumping device, the headrest soft bag is positioned at the upper end of the backrest, and the headrest lifting air bag is positioned between the headrest soft bag and the backrest.

Preferably, the back massage backrest further comprises a backrest sleeve, and the back massage air bag and the waist support massage air bag are both positioned in the backrest sleeve.

Preferably, a plurality of ventilation holes are formed in one surface of the backrest sleeve, which is far away from the backrest.

Preferably, a female zipper is arranged on the surface of the backrest, a child zipper is arranged on one surface of the backrest, which is close to the backrest, of the backrest sleeve, and the female zipper and the child zipper are matched with each other so that the backrest massage backrest bag can be detachably arranged on the surface of the backrest.

Preferably, the backrest sheath is removably mounted on the backrest by snap fasteners or straps.

Preferably, a seat cushion is arranged on the base, a seat bag is arranged on the seat cushion, a hip massage air bag is arranged in the seat bag, and the hip massage air bag is communicated with the air pumping device.

Preferably, the seat bag is detachably mounted on the upper surface of the seat cushion, and a plurality of ventilation holes are formed in the upper surface of the seat bag.

Preferably, the backrest comprises a back plate and a sponge soft bag, wherein the back plate is arranged on the base, the sponge soft bag is arranged on the front surface of the back plate, the back massage backrest bag is detachably arranged on the surface of the sponge soft bag, and the air pumping device is arranged on the back plate.

The base comprises a base, a bottom frame, a driving mechanism and a linkage type hinge mechanism, wherein the bottom frame is arranged on the base, the driving mechanism is arranged on the bottom frame, the linkage type hinge mechanism is movably arranged on the bottom frame and is connected with the output end of the driving mechanism, the leg support is arranged at the front end of the linkage type hinge mechanism, the backrest is arranged at the rear end of the linkage type hinge mechanism, and the driving mechanism can drive the linkage type hinge mechanism to extend or retract so as to adjust the lifting or retracting of the leg support and adjust the inclination angle of the backrest.

The electric chair has the advantages that the back massage air bag and the waist support massage air bag are integrated in the back massage backrest bag, and the back massage backrest bag is detachably arranged relative to the backrest, so that the production process of the electric chair and the massage module can be simplified, the back massage backrest bag is convenient to maintain in the later period, the flexibility is higher, and the use is more convenient. In particular, due to the detachable design of the back massage backrest, a user can selectively mount and dismount the back massage backrest to meet different use requirements.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of the structure of an electric chair according to the present utility model;

FIG. 2 is a schematic view of the structure of the backrest, the backrest massage bag, the air pumping device and the hip massage air bag;

FIG. 3 is a schematic view of the structure of the base of the present utility model;

FIG. 4 is a schematic view of the structure of the base of the present utility model with the seat plate removed;

FIG. 5 is a schematic view of the structure of the bottom frame of the present utility model;

FIG. 6 is a schematic view of the drive mechanism and the linked hinge mechanism of the present utility model;

fig. 7 is a schematic structural view of the left hinge assembly of the present utility model.

In the drawings, 1-base, 11-base, 12-bottom frame, 13-seat board, 14-driving mechanism, 141-driving motor, 142-screw, 143-moving shell, 15-linkage type hinge mechanism, 151-connecting cross bar, 152-left hinge component, 1521-first connecting rod, 1522-second connecting rod, 1523-third connecting rod, 1524-fourth connecting rod, 1525-long rod, 1526-left connecting rod, 1527-fixed plate, 153-right hinge component, 2-backrest, 21-backboard, 22-sponge soft bag, 3-backrest massage backrest bag, 31-back massage airbag, 32-lumbar support massage airbag, 33-headrest soft bag, 34-headrest lifting airbag, 35-backrest cover, 4-pumping device, 5-cushion, 6-seat bag, 61-buttock massage airbag and 7-leg support.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear are referred to in the embodiments of the present utility model), the directional indications are merely used to explain the relative positional relationship, movement conditions, and the like between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

Referring to fig. 1 and 2, an electric chair includes a base 1, a backrest 2, a backrest massage bag 3, and a pumping device 4. The base 1 is a supporting part of the electric chair, the backrest 2 is arranged on the base 1 for a user to lean on, and the backrest massage bag is detachably arranged on the backrest 2. The back massage backrest 3 comprises a back massage air bag 31 and a waist support massage air bag 32, and the back massage air bag 31 and the waist support massage air bag 32 are communicated with the air pumping device 4. The back massage airbag 31 is used to massage the back of the user, improving comfort. The back massage air bags 31 are provided in plurality, and the back massage air bags 31 are inflated and deflated by the air pumping device 4 to realize the massage of the back of the user. At least two back massage devices are arranged on the backrest 2, and different back massage devices are arranged at intervals up and down. Because the back area is large, providing a plurality of back massage air bags 31 can increase the coverage area of back massage, improving comfort. The waist support massage air bag 32 is internally provided with an inflatable and deflatable air bag, the inflatable and deflatable air bag is inflated and deflated by the air pumping device 4, the waist support massage air bag 32 provides the functions of supporting the waist and massaging, the fatigue of the waist is relieved, and a user can adjust the pressure of the air bag by the control panel to obtain the optimal supporting effect. The back massage air bags 31 are provided with a plurality of massage methods which can simulate kneading, pinching, knocking and the like, and a user can adjust the massage mode and the force through a remote controller to enjoy personalized massage experience. The air pumping device 4 can independently inflate and deflate the back massage air bag 31 or the waist support massage air bag 32 so as to meet different use requirements of users. The electric chair is very suitable for various scenes such as families, offices, leisure, and the like, and can greatly improve comfort and health experience for users who need sitting postures for a long time. Particularly under the condition of high fatigue and pressure, the back and waist fatigue is relieved and the overall sitting comfort is improved through the inflation and deflation of the back massage air bag 31 and the waist support massage air bag 32.

In this technical scheme, back massage gasbag 31 and waist hold in the palm massage gasbag 32 integrated in back massage lean on package 3, and back massage lean on package 3 to the back 2 can dismantle the setting, consequently can simplify the production technology of electric chair and massage module, make things convenient for back massage lean on package 3 to maintain later stage, and the flexibility is higher, and it is more convenient to use. In particular, due to the detachable design of the back massage backrest 3, the user can selectively mount and dismount the back massage backrest 3, meeting different use requirements.

Referring to fig. 1 and 2, the back massage bag 3 further includes a headrest soft bag 33 and a headrest lifting airbag 34. The headrest soft bag 33 is located at the upper end of the backrest 2, and is capable of being used for the headrest of the head of a user and providing support for the head of the user in a use state. The headrest lifting airbag 34 is located between the headrest soft bag 33 and the backrest 2 and is communicated with the air pumping device 4, the air pumping device 4 can charge the headrest lifting airbag 34 so that the headrest lifting airbag 34 lifts the headrest soft bag 33, and when the headrest soft bag 33 does not need to be lifted, the headrest lifting airbag 34 is deflated. Existing chairs and sofas are generally provided with complex lifting mechanisms to lift the headrest and further lift the head of a user. In this embodiment, by arranging the headrest lifting airbag 34, the headrest soft bag 33 can be lifted by inflating the headrest lifting airbag 34 by using the pumping device 4, so that not only is the structure simplified, but also the manufacturing cost is greatly reduced. In addition, the headrest lifting air bags 34 are inflated and deflated regularly, so that a certain massage effect on the head of a user can be achieved, and the headrest soft bag 33 and the headrest lifting air bags 34 are used as a part of the back massage backrest bag 3, so that later maintenance is facilitated, and the flexibility is greatly improved.

Referring to fig. 1, the back massage backrest 3 further includes a backrest sleeve 35, and the back massage airbag 31 and the lumbar support massage airbag 32 are both positioned in the backrest sleeve 35. The design of the backrest sleeve 35 facilitates the arrangement of the back massage air bag 31 and the waist support massage air bag 32, and improves the integration of the backrest massage backrest 3.

The side of the backrest 35 facing away from the backrest 2 is provided with a plurality of ventilation holes (not shown). One surface of the backrest sleeve 35 is tightly attached to the backrest 2, the other surface is tightly attached to the back of the user, and the air holes are formed in the surface tightly attached to the back of the user. By arranging a plurality of ventilation holes, the ventilation property of the back can be improved, and the comfort of a user can be improved.

In this embodiment, the surface of the backrest 2 is provided with a female zipper (not shown in the figure), and the side of the backrest cover 35 adjacent to the backrest 2 is provided with a male zipper (not shown in the figure), and the female zipper and the male zipper are matched with each other so that the backrest massage backrest 3 is detachably mounted on the surface of the backrest 2. Namely, the backrest sheath 35 can be quickly and conveniently arranged on the backrest 2 in a zipper mode, and the backrest massage backrest 3 is further arranged on the backrest 2, so that the backrest massage backrest has a simple structure and is convenient and quick to install.

In other embodiments, the backrest sheath 35 may also be removably mounted to the backrest 2 by snaps (not shown) or straps (not shown). For example, a female buckle is arranged on the backrest 2, a male buckle is arranged on the backrest sleeve 35, and the male buckle and the female buckle are buckled together, so that the backrest massage backrest 3 can be detachably arranged on the backrest 2. Alternatively, the backrest 2 and the backrest sheath 35 are provided with binding bands, and the backrest massage backrest 3 is detachably mounted on the backrest 2 by binding the two corresponding binding bands together. Alternatively, the binding band is provided on the backrest and the structure for binding the binding band is provided on the backrest 2. Therefore, the detachable connection of the backrest massage bag 3 and the backrest 2 is not limited to the slide fastener, the snap fastener, the binding band, and the like.

Referring to fig. 1, a seat cushion 5 is provided on a base 1, and a material of the seat cushion 5 is made of high-elasticity foam and air-permeability fabric (the fabric is not shown in the figure for convenience in displaying technical features) so as to improve comfort and durability. Referring to fig. 1 and 2, a seat bag 6 is provided on the seat cushion 5, a hip massage air bag 61 is provided in the seat bag 6, and the hip massage air bag 61 is communicated with the air pumping device 4. When a user sits on the seat cushion 5, the hip massage air bags 61 are inflated and deflated by controlling the air pumping device 4, so that the hip massage of the user can be realized, and particularly, the hip massage air bags 61 are inflated, so that the user can be lifted to a certain extent, the hip position of the user is more breathable, and the comfort is higher.

The seat bag 6 is detachably arranged on the surface of the cushion 5, so that the production process can be simplified, the later maintenance is convenient, and the flexibility is improved. The detachable connection between the seat bag 6 and the seat cushion 5 can refer to the connection between the backrest cover 35 and the backrest 2, and will not be described in detail herein.

The lower surface of the seat bag 6 is clung to the cushion 5, the upper surface is clung to the buttocks of the user, and the upper surface of the seat bag 6 is provided with a plurality of ventilation holes, so that the ventilation property of the buttocks can be improved, and the comfort of the user can be improved.

Referring to fig. 2, the backrest 2 includes a back plate 21 and a sponge pack 22. The back plate 21 is arranged on the base 1, and the sponge soft bag 22 is arranged on the front surface of the back plate 21. The back massage backrest 3 is detachably arranged on the surface of the sponge soft bag 22, and the pumping device 4 is arranged on the back plate 21. The back plate 21 is a long plate with an arc bending, and the sponge soft bag 22 is arranged on the front surface of the back plate 21. The height of the back plate 21 is larger than that of the sponge soft pack 22, the lower end of the back plate 21 extends downwards relative to the sponge soft pack 22, and the pumping device 4 is arranged at the position where the back plate 21 extends downwards. The structure is arranged in this way, so that the air pumping device 4 can be conveniently installed, and the air pumping device 4 can be conveniently communicated with the back massage air bag 31, the waist support massage air bag 32 and the buttock massage air bag 61.

Referring to fig. 1, the electric chair further includes a leg rest 7, and the leg rest 7 is used for supporting the legs of the user. Referring to fig. 3 and 4, the base 1 includes a base 11, a bottom frame 12, a seat plate 13, a driving mechanism 14, and a linked hinge mechanism 15.

The base 11 is used for being placed on the ground and supporting other parts of the electric chair. The base frame 12 is mounted on the base 11, the seat plate 13 is mounted on the base frame 12, and the seat cushion 5 is mounted on the upper end surface of the seat plate 13 for seating by a user. A driving mechanism 14 is mounted on the bottom frame 12 and below the seat plate 13, and the driving mechanism 14 is used for driving the linkage hinge mechanism 15 to extend or retract. The linked hinge mechanism 15 is movably mounted on the base frame 12 and is connected to the output of the drive mechanism 14. The leg rest 7 is mounted at the front end of the linked hinge mechanism 15, the leg rest 7 bearing the user's legs in use. The backrest 2 is mounted at the rear end of the linkage hinge mechanism 15, and the backrest 2 is used for the back of a user to rest and support the upper body of the user during use. The drive mechanism 14 may drive the linked hinge mechanism 15 to extend or retract. When the driving mechanism 14 drives the linkage type hinge mechanism 15 to extend, the linkage type hinge mechanism 15 can drive the leg rest 7 to lift, and simultaneously the inclination angle of the backrest 2 is adjusted to be larger, so that the leg rest 7 can support the legs of a user, and the backrest 2 can support the user lying down. By setting the drive mechanism 14 or the linked hinge mechanism 15, the effect of a "zero gravity" sofa can be achieved. The structure of the driving mechanism 14 and the linkage type hinge mechanism 15 can realize that one driving source drives the backrest 2 and the leg rest 7 to be adjusted simultaneously, and the structure of the electric chair can be greatly simplified.

Referring to fig. 6, the ganged-hinge mechanism 15 includes a connecting rail 151, a left hinge assembly 152, and a right hinge assembly 153. The left hinge assembly 152 and the right hinge assembly 153 are identical in structure and symmetrically disposed, wherein the left hinge assembly 152 is movably mounted on the left side of the bottom frame 12, and the right hinge assembly 153 is movably mounted on the right side of the bottom frame 12. The connecting rail 151 is connected to the output end of the driving mechanism 14, and both ends are connected to the left hinge assembly 152 and the right hinge assembly 153, respectively. The drive mechanism 14 may push or pull the connecting rail 151 forward or backward. When the driving mechanism 14 pushes the connecting rail 151 forward, the left hinge assembly 152 and the right hinge assembly 153 are extended simultaneously, thereby lifting the leg rest 7 and increasing the inclination angle of the backrest 2. When the driving mechanism 14 pulls the connecting rail 151 rearward, the left hinge assembly 152 and the right hinge assembly 153 are retracted simultaneously, thereby retracting the leg rest 7 and adjusting the inclination angle of the backrest 2. The linked hinge mechanism 15 enables the leg rest 7 and the backrest 2 to be adjusted more smoothly by providing the left hinge assembly 152 and the right hinge assembly 153. The left hinge assembly 152 and the right hinge assembly 153 can be synchronously adjusted through the connecting cross rod 151, and only one driving mechanism 14 is needed, so that the cost is reduced, and the synchronism is improved. The connecting cross bar 151 can also improve the structural stability of the left hinge assembly 152 and the right hinge assembly 153, and ensure the stability of sofa adjustment.

As described above, the left hinge assembly 152 and the right hinge assembly 153 are identical in structure, and thus, only the specific structure of the left hinge assembly 152 will be described in detail in this embodiment, and repetitive description will be avoided.

Referring to fig. 7, in particular, the left hinge assembly 152 includes a first link 1521, a second link 1522, a third link 1523, a fourth link 1524, a long bar 1525, and a left connecting plate 1526. One end of the first link 1521 and one end of the second link 1522 are rotatably connected to the bottom frame 12. The other end of the first link 1521 is rotatably connected to one end of the third link 1523. One end of the second link 1522 is rotatably connected to one end of the fourth link 1524. The third link 1523 is rotatably coupled to the fourth link 1524. The other end of the third link 1523 and the other end of the fourth link 1524 are connected to the leg rest 7. One end of the long rod 1525 is rotatably connected to the second link 1522, and the other end of the long rod 1525 is rotatably connected to the left link 1526. The left connecting plate 1526 is rotatably connected to the bottom frame 12, and the left connecting plate 1526 is also connected to the backrest 2. One end of the connecting rail 151 is connected to the second link 1522, and the other end of the connecting rail 151 is connected to the second link 1522 in the right hinge assembly 153. The structure of the left hinge assembly 152 provided in this embodiment can simultaneously achieve lifting or retracting of the leg rest 7 and angular adjustment of the backrest 2 by a simple structure.

Referring to fig. 7, the left hinge assembly 152 further includes a fixing plate 1527. One end of the first link 1521 and one end of the second link 1522 are rotatably connected to the fixed plate 1527, and the fixed plate 1527 is fixedly connected to the bottom frame 12, i.e., one end of the first link 1521 and one end of the second link 1522 are rotatably connected to the fixed plate 1527, so as to connect the first link 1521 and the second link 1522 to the bottom frame 12. By providing the fixing plate 1527, the left hinge assembly 152 can be easily assembled, and the left hinge assembly 152 can be more structurally complete, and the left hinge assembly 152 can be more easily mounted on the left side frame. On the other hand, the fixing plate 1527 connects the first link 1521 and the second link 1522, which enables smoother extension and retraction of the left hinge assembly 152.

Referring to fig. 6, further, the driving mechanism 14 includes a driving motor 141, a screw 142, and a moving housing 143. The output end of the driving motor 141 is connected to one end of the screw 142, and is used for driving the screw 142 to rotate. The driving housing 143 is sleeved on the screw 142 and is screwed with the screw 142. The driving motor 141 is mounted on the bottom frame 12. One end of the movable housing 143 remote from the drive motor 141 is connected to the linked hinge mechanism 15, specifically to an intermediate position of the connecting rail 151. The driving motor 141 rotates to drive the screw 142 to rotate around the central axis, and the screw 142 rotates to drive the movable housing 143 to move along the vertical direction of the screw 142 relative to the screw 142. The driving motor 141 can be controlled to realize forward rotation and reverse rotation, so that the screw 142 can also be rotated forward or reverse rotation, and the movable housing 143 can be moved in two directions under the action of the screw 142, thereby realizing the purpose of driving the linked hinge mechanism 15 to extend or retract.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims (10)

1. The electric chair is characterized by comprising a base (1), a backrest (2), a backrest massage backrest bag (3) and a pumping device (4), wherein the backrest (2) is arranged on the base (1), the backrest massage backrest bag (3) is detachably arranged on the backrest (2), the backrest massage backrest bag (3) comprises a back massage air bag (31) and a waist support massage air bag (32), and the back massage air bag (31) and the waist support massage air bag (32) are both communicated with the pumping device (4).

2. An electric chair according to claim 1, characterized in that the back massage backrest (3) further comprises a headrest soft pack (33) and a headrest lifting air bag (34), the headrest lifting air bag (34) being in communication with the pumping means (4), the headrest soft pack (33) being located at the upper end of the backrest (2), the headrest lifting air bag (34) being located between the headrest soft pack (33) and the backrest (2).

3. An electric chair according to claim 1, characterized in that the back massage backrest (3) further comprises a backrest sheath (35), the back massage airbag (31) and the lumbar support massage airbag (32) being both located within the backrest sheath (35).

4. A chair according to claim 3, wherein the side of the backrest cover (35) remote from the backrest (2) is provided with a plurality of ventilation holes.

5. An electric chair according to claim 3, characterized in that the surface of the backrest (2) is provided with a female zipper, one surface of the backrest (2) close to the backrest (2) is provided with a male zipper, and the female zipper and the male zipper are mutually matched so that the backrest massage backrest (3) is detachably mounted on the surface of the backrest (2).

6. A chair according to claim 3, characterized in that the sheath (35) is removably mounted on the backrest (2) by means of snap fasteners or straps.

7. An electric chair according to claim 1, characterized in that the base (1) is provided with a seat cushion (5), the seat cushion (5) is provided with a seat bag (6), a hip massage air bag (61) is arranged in the seat bag (6), and the hip massage air bag (61) is communicated with the air pumping device (4).

8. The electric chair according to claim 7, wherein the seat bag (6) is detachably mounted on the upper surface of the seat cushion (5), and a plurality of ventilation holes are formed in the upper surface of the seat bag (6).

9. An electric chair according to claim 1, characterized in that the backrest (2) comprises a back plate (21) and a sponge soft pack (22), the back plate (21) is arranged on the base (1), the sponge soft pack (22) is arranged on the front surface of the back plate (21), the back massage backrest (3) is detachably arranged on the surface of the sponge soft pack (22), and the air pumping device (4) is arranged on the back plate (21).

10. The electric chair according to claim 1, further comprising a leg rest (7), wherein the base (1) comprises a base (11), a bottom frame (12), a driving mechanism (14) and a linkage hinge mechanism (15), the bottom frame (12) is mounted on the base (11), the driving mechanism (14) is mounted on the bottom frame (12), the linkage hinge mechanism (15) is movably mounted on the bottom frame (12) and is connected with the output end of the driving mechanism (14), the leg rest (7) is mounted at the front end of the linkage hinge mechanism (15), the backrest (2) is mounted at the rear end of the linkage hinge mechanism (15), and the driving mechanism (14) can drive the linkage hinge mechanism (15) to extend or retract so as to adjust the leg rest (7) to lift or retract and adjust the inclination angle of the backrest (2).