CN116392355A - Multifunctional checking chair convenient to regulate and control - Google Patents

Abstract

The invention provides a multifunctional checking chair convenient to regulate and control, which comprises: the support comprises a fixing frame, a motor and a screw rod, wherein the motor is fixedly arranged in the fixing frame, and the screw rod is fixedly arranged on an output shaft of the motor; the connecting frame is slidably arranged at the top end of the fixing frame, the screw rod penetrates through the connecting frame, and the screw rod is in threaded connection with the connecting frame; the seat board is fixedly arranged at the top end of the connecting frame, and is provided with two adjusting holes and a sliding hole; the transmission assembly comprises a transmission rod, a sliding toothed plate, a gear set, a chain and two driven chain wheels. The scheme is finally realized when the seat board is highly adjusted, and the transmission assembly can synchronously drive the back plate and the pedal to rotate, so that the back plate and the pedal rotate to be adjusted, the pedal requirements of different inclinations are met, and when the seat board is adjusted to be in a horizontal state, the seat board is used for lying flat diagnosis, the use mode of the seat is switched, and the functionality of the inspection chair is enhanced.

Description

A conveniently adjustable multifunctional examination chair

technical field

The invention relates to the technical field of examination chairs, in particular to a multifunctional examination chair that is conveniently regulated.

Background technique

Before the treatment of the patient, a preliminary examination and diagnosis of the physical condition is required. During the examination and diagnosis process, the examination chair for auxiliary examination and diagnosis is used to keep the patient sitting on the examination chair so as to check the condition. The patient needs to be able to lie down.

The examination chair is mainly used to support the patient's body, and it is convenient to adjust the inclination of the patient's body, so as to facilitate the examination of the patient from different angles and directions. The labor intensity of medical staff during operation.

In order to meet the needs of patients for examination and treatment, the existing technology uses seats and examination beds in the consultation room, which occupy a large space in the room, and foldable seats are also used. The functionality of the foldable seat itself is single. Its functionality needs to be further researched and developed.

Therefore, it is necessary to provide a conveniently regulated multifunctional inspection chair to solve the above technical problems.

Contents of the invention

The invention provides a conveniently regulated multifunctional examination chair, which solves the problem in the related art that the functionality of the seat needs to be further developed.

In order to solve the above technical problems, the conveniently regulated multifunctional inspection chair provided by the present invention includes:

A support, the support includes a fixed frame, a motor and a screw rod, the motor is fixed in the fixed frame, and the screw rod is fixed in the output shaft of the motor;

A connecting frame, the connecting frame is slidably installed on the top of the fixing frame, the screw rod runs through the connecting frame, and the screw rod is threadedly connected with the connecting frame;

A seat plate, the seat plate is fixed on the top of the connecting frame, the connecting frame communicates with the inside of the seat plate, and the seat plate is provided with two adjustment holes and a sliding hole;

A transmission assembly, the transmission assembly includes a transmission rod, a sliding tooth plate, a gear set, a chain and two driven sprockets, the two ends of the transmission rod are hinged to the fixed frame and the sliding tooth plate, and the transmission rod The top end is inserted into the seat plate through the sliding hole, the sliding tooth plate is slidably installed in the seat plate, the gear set includes a transmission gear and a drive sprocket, and the transmission gear meshes with the sliding tooth plate , the transmission gear and the driving sprocket are fixed on the same rotating shaft, and are rotatably installed in the seat plate, the driving sprocket is connected with a chain, and the chain transmission is installed on the two driven sprockets, the two drive sprockets are rotatably mounted on both ends of the seat plate;

a back plate, the back plate passes through one of the adjustment holes and is fixed on the shaft end of one of the driven sprockets;

A pedal, the pedal passes through the other adjustment hole and is fixed on the shaft end of the other driven sprocket.

Preferably, the connecting frame is a rectangular structure.

Preferably, a through hole is opened on the back plate, and the conveniently regulated multifunctional inspection chair also includes a cloth changing assembly, which includes a connecting cover, at least three rollers, cloth, a driving mechanism and rollers , the connection cover is fixed on the back plate, and three rollers are installed in the connection cover, the cloth passes through the through hole and the connection cover in turn, and the cloth is wound around the back plate and between the three rollers, the driving mechanism is fixed on the connecting cover, the shaft end of the driving mechanism passes through the connecting cover and a roller is fixedly installed, and the roller passes through the roller The shaft clamps the cloth.

Preferably, the roller adopts a rubber wheel structure, and the surface is provided with anti-skid lines.

Preferably, a backing plate is fixed on the front of the backboard, the backing plate has an arc-shaped structure, and the fabric is slidably connected to the outer surface of the backing plate.

Preferably, the backing plate is an air cushion structure.

Preferably, the conveniently regulated multifunctional examination chair further includes a control board, the control board is suspended on the seat board, the output end of the control board is electrically connected with the control end of the motor, and the The output terminal of the control board is electrically connected with the control terminal of the driving mechanism.

Preferably, the width of the control board is the same as that of the seat board, and one side is fixed and the other side is suspended.

Preferably, the bottom of the control board has a circular arc structure, and the surface cover is provided with a rubber sleeve, and the thickness of the rubber sleeve is 5mm.

Preferably, a first folding rod is rotatably mounted on the seat plate, the top of the first folding rod is rotatably mounted on the control board, and one end of the second folding rod is rotatably mounted on the top of the first folding rod. The other end of the second folding rod is rotatably mounted on the backboard.

Compared with related technologies, the conveniently regulated multifunctional inspection chair provided by the present invention has the following beneficial effects:

The connecting frame is conveniently driven up by the motor and the screw rod. When the connecting frame is moved up, the seat plate is moved up as a whole, so as to adjust the height of the seat plate. When the height of the seat plate is adjusted, the transmission component can synchronously drive the back plate and the seat plate. The rotation of the pedals makes the backplane and the pedals rotate and adjust to meet the needs of pedals with different inclinations. When adjusted to a horizontal state, it is used for lying down diagnosis, realizes the switching of the use mode of the seat, and enhances the functionality of the examination chair.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative effort.

Fig. 1 is a schematic structural view of the first embodiment of the conveniently adjustable multifunctional inspection chair provided by the present invention;

Figure 2 is a sectional view of the whole shown in Figure 1;

Fig. 3 is a three-dimensional diagram of the gear set shown in Fig. 2;

Fig. 4 is a three-dimensional diagram of the driven sprocket shown in Fig. 2;

Fig. 5 is an enlarged schematic diagram of part A shown in Fig. 2;

Fig. 6 is a schematic diagram of the first embodiment of the conveniently adjustable multi-functional inspection chair provided by the present invention, wherein (a) is a front view of the state where the backboard is lifted, and (b) is a front view of the state where the backboard is turned downward Figure, (c) is the front view of the horizontal state of the backboard;

Fig. 7 is a schematic structural view of the second embodiment of the conveniently adjustable multifunctional inspection chair provided by the present invention;

FIG. 8 is a schematic structural view of the unfolded state of the backboard shown in FIG. 7 .

Explanation of reference numbers:

1. Support, 11. Fixed frame, 12. Motor, 13. Screw rod;

2. Connecting frame;

3, seat plate, 31, adjustment hole, 32, sliding hole;

4, transmission assembly, 41, transmission rod, 42, sliding tooth plate, 43, gear set, 431, transmission gear, 432, driving sprocket, 44, chain, 45, driven sprocket;

5. Backplane;

6. Pedal;

51. Through hole;

7. Cloth changing assembly, 71. Connecting cover, 72. Roller shaft, 73. Cloth, 74. Driving mechanism, 75. Roller wheel;

52. Backing plate;

33, the first folding rod, 52, the second folding rod;

8. Hold the board;

111, fixed seat, 112, rotating disk;

9, brake assembly, 91, telescopic part, 92, brake disc.

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

First embodiment:

The invention provides a multifunctional inspection chair which is convenient to control.

Please refer to Fig. 1 to Fig. 4 in combination. In the first embodiment of the present invention, the conveniently adjustable multifunctional inspection chair includes:

Support 1, described support 1 comprises fixed frame 11, motor 12 and screw mandrel 13, and described motor 12 is fixedly arranged in described fixed frame 11, and described screw rod 13 is fixedly arranged at the output shaft of described motor 12 ;

Connecting frame 2, described connecting frame 2 is slidably installed on the top of described fixing frame 11, and described screw rod 13 runs through described connecting frame 2, and described screw rod 13 is threadedly connected with described connecting frame 2;

Seat plate 3, the seat plate 3 is fixed on the top of the connecting frame 2, the connecting frame 2 communicates with the seat plate 3, and the seat plate 3 has two adjustment holes 31 and a sliding hole 32 ;

The transmission assembly 4, the transmission assembly 4 includes a transmission rod 41, a sliding tooth plate 42, a gear set 43, a chain 44 and two driven sprockets 45, the two ends of the transmission rod 41 are hinged to the fixed frame 11 and the The sliding tooth plate 42, the top end of the transmission rod 41 is inserted into the seat plate 3 through the sliding hole 32, the sliding tooth plate 42 is slidably installed in the seat plate 3, and the gear set 43 includes transmission gears 431 and a driving sprocket 432, the transmission gear 431 meshes with the sliding tooth plate 42, the transmission gear 431 and the driving sprocket 432 are fixed on the same rotating shaft, and are rotatably installed in the seat plate 3 , the drive sprocket 432 is connected with a chain 44 for transmission, and the chain 44 is transmission mounted on the two driven sprockets 45, and the two transmission sprockets 45 are rotatably mounted on both ends of the seat plate 3;

a back plate 5, the back plate 5 passes through one of the adjustment holes 31 and is fixed on the shaft end of one of the driven sprockets 45;

The pedal 6 passes through the other adjustment hole 31 and is fixed on the shaft end of the other driven sprocket 45 .

In this embodiment, the connecting frame 2 runs through the fixing frame 11 , and can be adjusted by sliding up and down on the top of the fixing frame 11 .

The motor 12 and the screw rod 13 are convenient to drive the connecting frame 2 to move up. When the connecting frame 2 moves up, the seat plate 3 is moved up as a whole, so as to adjust the height of the seat plate 3. When the height of the seat plate 3 is adjusted, the transmission The component 4 can synchronously drive the backboard 5 and the pedal 6 to rotate, so that the backboard 5 and the pedal 6 can be rotated and adjusted to meet the needs of the pedal 6 with different inclinations. When it is adjusted to a horizontal state, it can be used for lying flat diagnosis and realize the use mode of the seat Toggle to enhance the functionality of the examination chair.

In this embodiment, the motor 12 is a stepping motor, which is connected to an external power source to provide a power source for the rotation of the screw rod 13 .

When the screw rod 13 rotates forward, the connecting frame 2 moves up, and the seat plate 3 moves up;

When the screw mandrel 13 reversed, the connecting frame 2 moved down, and the seat plate 3 moved down.

In this embodiment, the connecting frame 2 is a rectangular structure.

When connecting between the rectangular connecting frame 2 and the fixed frame 11, it can only lift and slide, and can not rotate on the fixed frame 11.

In this embodiment, the positions of the two adjustment holes 31 are respectively matched with the installation positions of the backboard 5 and the pedal 6 to provide installation and rotation space for the backboard 5 and the pedal 6 .

In this embodiment, the seat plate 3 is provided with a chute structure, and the sliding tooth plate 42 is inserted into the chute structure and is slidably connected with the seat plate 3 .

The chute structure provides a limit for the sliding of the sliding tooth plate 42 , ensures the stability of the movement adjustment of the sliding tooth plate 42 , and maintains the stability of the connection between the sliding tooth plate 42 and the transmission gear 431 .

Wherein, the tooth pressure portion of the sliding tooth plate 42 is misaligned with the driven sprocket 45 portion.

Please refer to Fig. 2 again, the backboard 5 is provided with a through hole 51, and the conveniently adjustable multifunctional inspection chair also includes a cloth changing assembly 7, and the cloth changing assembly 7 includes a connecting cover 71, at least three rollers 72. Cloth 73, driving mechanism 74 and roller 75, the connecting cover 71 is fixed on the backboard 5, and three rollers 72 are installed in the connecting cover 71, and the cloth 73 passes through the The through hole 51 and the connecting cover 71, the cloth 73 is wound between the back plate 5 and the three rollers 72, the driving mechanism 74 is fixed on the connecting cover 71, and the driving mechanism The axle end of 74 passes through described connecting cover 71 and is fixedly installed with roller 75, and described roller 75 clamps described cloth 73 by described roller 72.

In this embodiment, the top and the bottom of the connection cover 71 are provided with openings for passing through and stably adjusting the cloth 73 .

In this embodiment, the surface of the cloth 73 is slidably sleeved on the surface of the backboard 5 , and the roller 75 can drive the cloth to drive when rolling.

The driving mechanism 74 conveniently drives the roller 75 to rotate, and the roller 75 cooperates with the roller 72 to drive the cloth 73 to slide on the surface of the backboard 5, so that the cloth 73 on the working surface of the backboard 5 is automatically replaced.

In this embodiment, the driving mechanism 74 is a motor structure, which provides a power source for the rotation adjustment of the roller 75 .

Automatic replacement of cloth 73:

Start the driving mechanism 74, the roller 75 rotates, and the compressed cloth 73 begins to roll and transport on the roller 72;

The cloth 73 slides on the backboard 5 while being rolled and transported, the unused range slides into the working surface of the backboard 5 , and the used range slides into the backside of the backboard 5 .

In an optional manner, a cleaning device for cleaning the cloth 73 may also be provided in the connection cover 71 according to the requirements of use, so as to facilitate automatic cleaning and maintenance while the cloth 73 is being transported.

Please refer to FIG. 2 again, the roller 75 adopts a rubber wheel structure, and anti-skid lines are provided on the surface.

It is used for the stable pressing of the cloth 73 on the surface of the corresponding roller 72 .

Please refer to FIG. 2 again, a backing plate 52 is fixed on the front of the backboard 5 , the backing plate 52 is in an arc-shaped structure, and the fabric 73 is slidably connected to the outer surface of the backing plate 52 .

The backing plate 52 is convenient to provide waist support for the patient, and is convenient for the patient's physical examination.

In an optional manner, the backing plate 52 is an air cushion structure.

Through the air cushion structure, it is convenient to adjust the height of the backing plate 52 during use, and at the same time, the comfort when the backing plate 52 supports the waist can be adjusted according to the needs of use.

With reference to Figure 6, the working principle of the conveniently regulated multifunctional inspection chair provided by this embodiment is as follows:

As shown in (a) in Figure 6, when the height of the seat plate 3 needs to be adjusted, the motor 12 is started, and the screw rod 13 drives the connecting frame 2 to move upward, and the seat plate 3 moves upward to adjust the height of the seat plate 3;

As shown in (b) in Figure 6, while the seat plate 3 is moving upward, the transmission rod 41 is pulled and rotated, the sliding tooth plate 42 advances, the transmission gear 431 and the drive sprocket 432 rotate synchronously, the chain 44 drives, and the two driven chains The wheel 45 rotates, the backboard 5 rotates clockwise, and the pedal 6 rotates clockwise, so that the backboard 5 and the pedal 6 rotate synchronously while the seat board 3 moves up;

As shown in (c) of Figure 6, when the seat plate 3 is fully moved up, the back plate 5 and the pedal 6 are rotated to a horizontal state, and the seat mode is adjusted to the recliner mode, which is convenient for the patient to lie down for examination when seeing a doctor.

Wherein, when the seat plate 3 moves down, the back plate 5 and the pedal 6 gradually return to the seat mode from the recliner mode until the seat plate 3 moves down to the initial state as shown in FIG. 1 .

Second embodiment:

Please refer to FIG. 7 to FIG. 8 . Based on the conveniently adjustable multifunctional examination chair provided by the first embodiment of the present invention, the second embodiment of the present invention proposes another conveniently adjustable multifunctional examination chair. The second embodiment is only a preferred mode of the first embodiment, and the implementation of the second embodiment will not affect the independent implementation of the first embodiment.

Specifically, the difference between the conveniently adjustable multifunctional examination chair provided by the second embodiment of the present invention is that the conveniently adjustable multifunctional examination chair further includes a control panel 8 suspended on the On the seat plate 3 , the output end of the control board 8 is electrically connected to the control end of the motor 12 , and the output end of the control board 8 is electrically connected to the control end of the driving mechanism 74 .

The control board 8 is arranged on the top of the seat board 3, on the one hand, it can provide position-limiting and hand-held support for the patient, and on the other hand, it is convenient to adjust and control the seat.

In this embodiment, the control board 8 adopts existing control equipment for controlling the motor 12 and the driving mechanism 74 .

The control panel 8 cooperates with the adjustable structure of the first embodiment to enhance the overall functionality of the examination chair.

In this embodiment, the width of the control board 8 is the same as that of the seat board 3 , and one side is fixed and the other side is suspended, so as to provide convenience for users to get on and off the seat.

In an optional embodiment, the control panel 8 can also be set as a rotatable structure for the rotation and storage of the control panel 8. The rotation structure adopts the existing damping hinge structure, which is convenient for positioning when it is not subjected to external force at the retracted point.

Please refer to FIG. 7 again, the bottom of the control board 8 is a circular arc structure, the surface cover is provided with a rubber sleeve, and the thickness of the rubber sleeve is 5mm.

The arc-shaped control panel 8 increases protection, and the rubber sleeve improves the cushioning during collision.

Please refer to Fig. 7 again, the first folding rod 33 is rotatably installed on the seat plate 3, the top of the first folding rod 33 is rotatably installed with the control panel 8, and one end of the second folding rod 52 is rotatably installed on the The top end of the first folding rod 33 and the other end of the second folding rod 52 are rotatably mounted on the backboard 5 .

During the rotation of the backboard 5, the control panel 8 can be driven synchronously to rotate, and the control panel 8 can be rotated and pressed down, so as to provide a pressing and limiting effect on the user's body and maintain the stability of the patient's body in action.

In this embodiment, the second folding rod 52 is arranged in parallel, and the included angle between the second folding rod 52 and the first folding rod 33 is 60°-70°.

Please refer to FIG. 7 again, the fixed frame 11 is composed of a fixed seat 111 and a rotating disk 112, the rotating disk 112 is rotatably mounted on the top of the fixed seat 111, and the bottom end of the transmission rod 41 is hinged on the rotating disk. 112, the connecting frame 2 is slidably installed on the rotating disk 112;

The conveniently regulated multifunctional inspection chair also includes a brake assembly 9, the brake assembly 9 includes a telescopic piece 91 and a brake disc 92, the telescopic piece 91 is fixed on the fixed seat 111, and the telescopic piece 91 stretches A brake disc 92 is fixedly installed at the end, and the brake disc 92 is slidably installed on the fixed base 111 , and the brake disc 92 abuts against and brakes tightly on the bottom of the rotating disc 112 .

When the brake disc 92 and the rotating disc 112 were braked tightly, the motor 12 could control the seat plate 3 to lift and adjust, so that the seat use mode was adjusted. When the brake disc 92 was separated from the rotating disc 112, the motor 12 controlled the seat plate 3 to rotate, and Plate 3, so as to facilitate the rotation adjustment of seat plate 3.

In this embodiment, the telescopic member 91 adopts an electric telescopic rod, which is connected to an external power source to provide a power source for the brake disc 92 to be telescopically adjusted.

When the brake disc 92 moves up and abuts against the rotating disc 112, the rotating disc 112 is locked and unable to rotate, and the screw rod 13 can drive the connecting frame 2 to stabilize the lifting adjustment, and is used to control the lifting adjustment of the seat board 3 and the back board 5 and pedals 6 part rotation adjustment;

When the brake disc 92 moves down and separates from the rotating disc 112, the rotating disc 112 is in an unlocked state. When the screw rod 13 rotates, the engaging friction force of the connecting frame 2 drives the rotating disc 112 to rotate. At the same time, the seat plate 3 rotates, which is used to adjust the seat. The rotation angle of the board 3 satisfies the needs of users.

The working principle of the conveniently adjustable multifunctional inspection chair provided in this embodiment:

S1, when the seat board 3 moves up, the back board 5 rotates clockwise, the second folding rod 52 rotates counterclockwise, and the first folding rod 33 rotates clockwise;

S2, when the backboard 5 is rotated to a horizontal state, the second folding lever 52 and the first folding lever 33 pull the control panel 8 to press down, so that the control panel 8 presses down on the user's body.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Under the conception of the present invention, the equivalent structural transformation made by using the description of the present invention and the contents of the accompanying drawings, or directly/indirectly used in Other relevant technical fields are all included in the patent protection scope of the present invention.

Claims (10)

1. A conveniently adjustable multifunctional examination chair, characterized in that it comprises: A support, the support includes a fixed frame, a motor and a screw rod, the motor is fixed in the fixed frame, and the screw rod is fixed in the output shaft of the motor; A connecting frame, the connecting frame is slidably installed on the top of the fixing frame, the screw rod runs through the connecting frame, and the screw rod is threadedly connected with the connecting frame; A seat plate, the seat plate is fixed on the top of the connecting frame, the connecting frame communicates with the inside of the seat plate, and the seat plate is provided with two adjustment holes and a sliding hole; A transmission assembly, the transmission assembly includes a transmission rod, a sliding tooth plate, a gear set, a chain and two driven sprockets, the two ends of the transmission rod are hinged to the fixed frame and the sliding tooth plate, and the transmission rod The top end is inserted into the seat plate through the sliding hole, the sliding tooth plate is slidably installed in the seat plate, the gear set includes a transmission gear and a driving sprocket, and the transmission gear meshes with the sliding tooth plate , the transmission gear and the driving sprocket are fixed on the same rotating shaft, and are rotatably installed in the seat plate, the driving sprocket is connected with a chain, and the chain transmission is installed on the two driven sprockets, the two drive sprockets are rotatably mounted on both ends of the seat plate; a back plate, the back plate passes through one of the adjustment holes and is fixed on the shaft end of one of the driven sprockets; A pedal, the pedal passes through the other adjustment hole and is fixed on the shaft end of the other driven sprocket. 2 . The conveniently adjustable multifunctional examination chair according to claim 1 , wherein the connecting frame is a rectangular structure. 3 . 3. The conveniently regulated multifunctional inspection chair according to claim 2, wherein a through hole is provided on the back plate, and the conveniently regulated multifunctional inspection chair further includes a cloth changing assembly, and the cloth changing The assembly includes a connection cover, at least three rollers, cloth, a driving mechanism and rollers. The connection cover is fixed on the back plate, and three rollers are installed in rotation in the connection cover. The cloth passes through the The through hole and the connecting cover, the cloth is wound between the back plate and the three rollers, the driving mechanism is fixed on the connecting cover, and the shaft end of the driving mechanism passes through the The connecting cover is fixedly installed with rollers, and the rollers clamp the cloth through the rollers. 4. The conveniently adjustable multifunctional inspection chair according to claim 3, characterized in that, the roller adopts a rubber wheel structure, and the surface is provided with anti-skid lines. 5. The conveniently regulated multifunctional inspection chair according to claim 4, characterized in that, a backing plate is fixed on the front of the backboard, the backing plate is an arc-shaped structure, and the cloth and the backing plate The outer surface of the sliding connection. 6 . The conveniently adjustable multifunctional examination chair according to claim 5 , wherein the backing plate is an air cushion structure. 7 . 7. The conveniently regulated multifunctional examination chair according to claim 6, characterized in that, the conveniently regulated multifunctional examination chair further comprises a control panel, the control panel is suspended on the seat plate, and the The output end of the control board is electrically connected with the control end of the motor, and the output end of the control board is electrically connected with the control end of the driving mechanism. 8 . The conveniently adjustable multifunctional inspection chair according to claim 7 , wherein the width of the control panel is the same as that of the seat panel, and one side is fixed and the other side is suspended. 9. The conveniently adjustable multifunctional inspection chair according to claim 8, characterized in that the bottom of the control panel has a circular arc structure, and the surface cover is provided with a rubber cover with a thickness of 5 mm. 10. The conveniently adjustable multifunctional inspection chair according to claim 9, characterized in that a first folding rod is rotatably mounted on the seat plate, and the top end of the first folding rod is rotatably mounted on the control panel, One end of the second folding rod is rotatably mounted on the top of the first folding rod, and the other end of the second folding rod is rotatably mounted on the backboard.

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