A convertible chair and method of using same

Abstract

The application discloses a convertible posture chair and a use method thereof, relates to the technical field of chairs, and aims to solve the problems of fixed contact area between the existing chair base and the ground, easy occurrence of dumping risk of the user's center of gravity in different use postures, and the flat structure of the back surface of the chair which does not conform to the ergonomic curve, and the technical scheme is characterized in that the chair comprises a chair frame assembly, a fabric assembly, a base assembly and two armrest frames, a touch panel is arranged on the armrest frame, the chair frame assembly comprises a seat plate main body, a backrest main body, a leg supporting plate main body and a hinge assembly, the fabric assembly comprises a bottom plate, a flexible breathable cover and an air bag, and the base assembly comprises a fixed frame and two movable frames arranged at the front end and the rear end of the fixed frame, the fixed frame and the movable frames are telescopic and expandable, the support area is actively increased, different centers of gravity are adapted to the ground, the air bag and the air charging and discharging equipment are arranged in the backrest, the softness and the curved surface form of the backrest are adjusted, and the backrest is fitted to the human body curve.

Description

Technical Field

[0001] This invention relates to the field of chair technology, specifically to a recumbent chair with a changeable form and its method of use. Background Technology

[0002] Recliners, as a common type of leisure furniture in everyday homes, are a type of furniture that falls between a regular chair and a bed. They can be used for sitting or reclining and are suitable for various scenarios. Their functionality and comfort directly affect the user experience.

[0003] A search revealed that prior art, publication number CN212995473U, discloses a novel reclining chair, including a footrest and a foldable cushion. The foldable cushion comprises a seat portion and a backrest portion. The seat portion is fixed to the footrest, and the backrest portion can be folded relative to the seat portion, enabling switching between sitting and reclining functions. The backrest portion has a foldable rear support, which unfolds and supports the backrest portion when reclining. This utility model has a reasonable structural design. By adding a rear support, it effectively prevents the chair from tipping over when laid flat. When not in use, the backrest is tucked away for storage, without affecting the overall appearance or seating function of the chair, thus improving its practicality, stability, and safety. Furthermore, this utility model adds a headrest structure to the backrest, which is easy to assemble and disassemble, and its height is adjustable, greatly improving the chair's comfort and practicality.

[0004] A search revealed that prior art, publication number CN220694716U, discloses an adjustable-backrest student recliner, including legs, a seat at the top of the legs, a main backrest rotatably connected to one side of the seat, a movable backrest slidably connected to one side of the main backrest, the top of the movable backrest protruding upwards from the top of the main backrest, a guide post on one side of the main backrest, a sliding groove inside the movable backrest, one end of the guide post passing through the sliding groove, the guide post slidingly engaging with the sliding groove, and a fixed seat at the protruding end of the guide post. The purpose is to address the technical problem that, due to significant height differences among students during their developmental stages, when taller students use the recliner, the backrest is too short to provide adequate head support when the recliner is adjusted to a reclining position, resulting in poor suitability for taller students.

[0005] Existing reclining chairs are inconvenient to switch between sitting and reclining positions, only allowing for simple transitions between sitting and reclining postures. They cannot meet the needs of users for semi-reclining or full-reclining rest. The fixed contact area between the base and the ground means that the user's center of gravity changes under different usage modes, which can easily lead to the risk of tipping over. The backrest surface is mostly a flat structure, which does not conform to the ergonomic curve. When sitting or reclining, the backrest does not fit well with the backrest, resulting in uneven pressure distribution and a lack of precise support for key areas. Prolonged sitting or reclining can easily cause fatigue and cannot meet the personalized sitting or reclining needs of different users. Summary of the Invention

[0006] The purpose of this invention is to provide a retractable reclining chair and its method of use.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a retractable recliner, comprising a chair frame assembly, a fabric assembly, a base assembly, and two armrests. The fabric assembly is fitted onto the upper surface of the chair frame assembly, and the two armrests are fixedly installed above both sides of the chair frame assembly, with touch panels provided on the armrests. The chair frame assembly includes a seat body, a backrest body, a leg support body, and a hinge assembly. The fabric assembly includes a base plate, a flexible breathable cover, and airbags. The flexible breathable cover is sewn together along the outer edge of the base plate, and the airbags are horizontally and equidistantly arranged inside the flexible breathable cover. The base assembly includes a fixed frame and two movable frames installed at the front and rear ends of the fixed frame.

[0008] Preferably, an inflation / deflation device is fixedly installed below the seat body, and the inflation / deflation device is connected to the airbag. The upper ends of the seat body, backrest body, and leg support body are fixedly installed with Velcro hooks, and the lower end of the base plate is fixedly installed with Velcro loops. The fabric assembly and the chair frame assembly are bonded together by the Velcro hooks and Velcro loops. The inflation / deflation device is electrically connected to the touch panel on the armrest frame.

[0009] Preferably, the fixed frame includes two supporting crossbeams and two first connecting rods. The two supporting crossbeams are arranged in parallel, and the two ends of the first connecting rods are welded to the ends of the supporting crossbeams. The movable frame includes a supporting longitudinal beam and two second connecting rods. The two second connecting rods are welded to the inner side of the supporting longitudinal beam. Each end of the supporting crossbeam has a telescopic cavity, and the second connecting rods are slidably installed inside the telescopic cavity. Anti-slip rubber pads are fitted and installed on the lower part of both ends of the supporting crossbeam and the supporting longitudinal beam. A threaded hole is provided on the inner surface of the supporting crossbeam, and the threaded hole communicates with the telescopic cavity. A locking bolt is installed in the threaded hole.

[0010] Preferably, the backrest body and leg support body are rotatably connected to the seat body at both ends via a hinge assembly. Hinge seats are fixedly installed on the bottom of the seat body, backrest body, leg support body, and base assembly. A first electric telescopic cylinder is installed on the bottom of the backrest body. A second electric telescopic cylinder is installed between the seat body and leg support body. Both ends of the first and second electric telescopic cylinders are rotatably connected to the hinge seats. The first and second electric telescopic cylinders are electrically connected to the touch panel on the armrest frame.

[0011] Preferably, two sets of support mechanisms are symmetrically installed below the chair frame assembly. The support mechanism includes a first connecting seat, a support arm, and a second connecting seat. The first connecting seat is welded to the base assembly. The lower end of the seat body is provided with two mounting cavities, which are arranged parallel and symmetrically at the lower end of the seat body. The second connecting seat is slidably installed inside the mounting cavity. The support arm is installed on the first connecting seat and the second connecting seat, and both ends of the support arm are rotatably connected to the first connecting seat and the second connecting seat, respectively.

[0012] Preferably, a bidirectional ball screw is rotatably mounted inside the mounting cavity, and the bidirectional ball screw is threadedly connected to the second connecting seat. A drive motor is embedded below the seat body, and a drive cavity is provided at the lower end of the seat body. A belt pulley transmission assembly is rotatably mounted inside the drive cavity, and the belt pulley transmission assembly is connected to the output end of the drive motor and one end of the two bidirectional ball screws. The drive motor is electrically connected to the touch panel on the armrest frame.

[0013] Preferably, an angle sensor is fixedly installed below both the backrest body and the leg support body, and the angle sensor is electrically connected to the touch panel on the armrest frame.

[0014] The following are the specific steps for using a retractable reclining chair: Step 1: When it is necessary to switch the reclining chair from a sitting position to a reclining position, the user inputs the desired reclining angle through the touch panel on the armrest frame. At the same time, the first and second electric telescopic cylinders are controlled to push the backrest body and the leg support body to rotate relative to the seat body around the hinge assembly, respectively. During the rotation process, the angle sensor provides real-time feedback on the rotation angle of the backrest body and the leg support body. After the backrest body and the leg support body rotate to the target angle, the first and second electric telescopic cylinders are stopped, completing the switch between sitting and reclining modes. Step 2: When the height of the recliner needs to be adjusted, the drive motor is started via the touch panel on the armrest to drive the belt pulley transmission assembly to rotate, which in turn drives the two bidirectional ball screws to rotate synchronously. This causes the two second connecting seats to move closer or further apart along the mounting cavity. During the movement of the second connecting seats, the support arm is deflected, which in turn causes the chair frame assembly to rise or fall as a whole, thus completing the height adjustment. Step 3: When it is necessary to adjust the bearing area of ​​the base assembly, first loosen the locking bolts on the inside of the support beam, pull the support longitudinal beam, and the second connecting rod will slide out from the telescopic cavity. Adjust the overall area of ​​the base composed of the fixed frame and the movable frame, expand the overall support area, and then tighten the locking bolts again to fix the second connecting rod. Step 4: Based on the user's preference for seat firmness, activate the inflation / deflation device via the touch panel on the armrest. Inflate or deflate the airbags using the device to adjust the internal air pressure of each airbag and the overall support firmness of the fabric assembly, ensuring that the surface curve of the fabric assembly conforms to the ergonomic curve. Step 5: The fabric assembly and the chair frame assembly are connected by the hook and loop sides of the Velcro. When the fabric assembly needs to be cleaned, simply tear off the Velcro and remove the fabric assembly from the chair frame assembly for cleaning or replacement. After cleaning, reattach it using the Velcro.

[0015] In summary, the beneficial technical effects of the present invention are as follows: 1. It adopts an adjustable base assembly, a first electric telescopic cylinder, and a second electric telescopic cylinder. The first and second electric telescopic cylinders respectively push the backrest body and the leg support body to rotate around the hinge assembly relative to the seat body, changing the angle of the backrest body and the leg support body to achieve the switching between sitting and reclining positions. The base assembly consists of a telescopic fixed frame and a movable frame structure. Pulling the support longitudinal beam slides the second connecting rod out of the telescopic cavity, expanding the overall support area. Tightening the locking bolts makes its front end make close contact with the second connecting rod for fixation. The contact area with the ground can be adjusted as needed to adapt to different ground environments such as smooth floors and carpets. At the same time, it adapts to the center of gravity needs of users with different weights. Combined with the anti-slip rubber pads on the bottom, it effectively prevents the chair from tipping over and improves the stability in various positions. 2. The chair employs fabric components and an inflation / deflation device. This device inflates or deflates the airbags, adjusting the internal pressure of each airbag and the overall support firmness of the fabric components. This ensures the fabric surface curves conform to ergonomic curves, increasing the fit between the backrest and the chair back, optimizing pressure distribution, and conforming to human biomechanical characteristics, thus improving sitting and reclining comfort. The fabric components are connected to the chair frame components via Velcro hooks and loops. When cleaning is required, simply tear off the Velcro to remove the fabric components from the chair frame components for cleaning or replacement. After cleaning, they can be reattached using Velcro. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a side view of the present invention; Figure 3 This is a structural diagram of the base assembly of the present invention; Figure 4 This is a structural diagram of the chair frame assembly of the present invention; Figure 5 This is the present invention. Figure 3 A magnified view of a portion of area A; Figure 6 This is a structural diagram of the connection between the second connecting seat and the main body of the seat plate of the present invention; Figure 7 This is a diagram showing the connection relationship between the second connecting seat and the main body of the seat plate of the present invention; Figure 8 This is a structural diagram of the fabric component of the present invention.

[0017] In the diagram, 1. Chair frame assembly; 101. Seat main body; 102. Backrest main body; 103. Leg rest main body; 104. Hinge assembly; 105. Velcro hook surface; 2. Fabric assembly; 201. Base plate; 202. Velcro fleece surface; 203. Flexible breathable cover; 204. Airbag; 3. Base assembly; 301. Support crossbeam; 302. First connecting rod; 303. Support longitudinal beam; 304. Second connecting rod; 305. 1. Anti-slip rubber pad; 306. Telescopic cavity; 307. Threaded hole; 308. Locking bolt; 4. Handrail frame; 5. First electric telescopic cylinder; 6. First connecting seat; 7. Support arm; 8. Hinge seat; 9. Second electric telescopic cylinder; 10. Second connecting seat; 11. Drive cavity; 12. Drive motor; 13. Belt pulley transmission assembly; 14. Mounting cavity; 15. Bidirectional ball screw; 16. Inflation / deflation device; 17. Angle sensor. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings.

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figure 1-8The present invention provides a technical solution: a retractable recliner, comprising a frame assembly 1, a fabric assembly 2, a base assembly 3, and two armrests 4. The fabric assembly 2 is fitted onto the upper surface of the frame assembly 1, and the two armrests 4 are fixedly installed on the upper sides of the frame assembly 1, with touch panels provided on the armrests 4. The frame assembly 1 includes a seat body 101, a backrest body 102, a leg support body 103, and a hinge assembly 104. The fabric assembly 2 includes a base plate 201, a flexible breathable cover 203, and airbags 204. The flexible breathable cover 203 is sewn together along the outer edge of the base plate 201, and the airbags 204 are horizontally and equidistantly arranged inside the flexible breathable cover 203. The base assembly 3 includes a fixed frame and two movable frames installed at the front and rear ends of the fixed frame.

[0021] Please see Figure 4 , Figure 6 and Figure 8 An inflation / deflation device 16 is fixedly installed below the seat body 101 and is connected to the airbag 204. The upper ends of the seat body 101, backrest body 102 and leg support body 103 are fixedly installed with Velcro hook surfaces 105, and the lower end of the base plate 201 is fixedly installed with Velcro loop surface 202. The fabric assembly 2 and the chair frame assembly 1 are glued together by the Velcro hook surface 105 and the Velcro loop surface 202. The inflation / deflation device 16 is electrically connected to the touch panel on the armrest frame 4.

[0022] Please see Figure 1 , Figure 3 and Figure 5 The fixed frame includes two supporting beams 301 and two first connecting rods 302. The two supporting beams 301 are arranged in parallel, and the two ends of the first connecting rods 302 are welded to the ends of the supporting beams 301. The movable frame includes a supporting longitudinal beam 303 and two second connecting rods 304. The two second connecting rods 304 are welded to the inner side of the supporting longitudinal beam 303. The inner sides of the supporting beams 301 are provided with telescopic cavities 306, and the second connecting rods 304 are slidably installed inside the telescopic cavities 306. Anti-slip rubber pads 305 are fitted and installed on the lower sides of the supporting beams 301 and the supporting longitudinal beams 303. The inner surface of the supporting beams 301 is provided with threaded holes 307, and the threaded holes 307 are connected to the telescopic cavities 306. Locking bolts 308 are installed in the threads of the threaded holes 307.

[0023] Please see Figure 1 and Figure 2The backrest body 102 and the leg support body 103 are rotatably connected to the two ends of the seat body 101 via a hinge assembly 104. A hinge seat 8 is fixedly installed on the bottom of the seat body 101, the backrest body 102, the leg support body 103, and the base assembly 3. A first electric telescopic cylinder 5 is installed on the bottom of the backrest body 102. A second electric telescopic cylinder 9 is installed between the seat body 101 and the leg support body 103. Both ends of the first electric telescopic cylinder 5 and the second electric telescopic cylinder 9 are rotatably connected to the hinge seat 8. The first electric telescopic cylinder 5 and the second electric telescopic cylinder 9 are electrically connected to the touch panel on the armrest frame 4. An angle sensor 17 is fixedly installed on the bottom of the backrest body 102 and the leg support body 103. The angle sensor 17 is electrically connected to the touch panel on the armrest frame 4.

[0024] Please see Figure 1 , Figure 6 and Figure 7 Two sets of support mechanisms are symmetrically installed below the chair frame assembly 1. Each support mechanism includes a first connecting seat 6, a support arm 7, and a second connecting seat 10. The first connecting seat 6 is welded to the base assembly 3. Two mounting cavities 14 are provided at the lower end of the seat body 101, and these two mounting cavities 14 are arranged parallel and symmetrically at the lower end of the seat body 101. The second connecting seat 10 is slidably installed inside the mounting cavity 14. The support arm 7 is installed on the first connecting seat 6 and the second connecting seat 10, and both ends of the support arm 7 are connected to the first connecting seat 6 and the second connecting seat 10, respectively. The seat 10 is rotatably connected, and a bidirectional ball screw 15 is rotatably installed inside the mounting cavity 14. The bidirectional ball screw 15 is threadedly connected to the second connecting seat 10. A drive motor 12 is embedded in the lower part of the seat body 101. A drive cavity 11 is provided at the lower end of the seat body 101. A belt pulley transmission assembly 13 is rotatably installed inside the drive cavity 11. The belt pulley transmission assembly 13 is connected to the output end of the drive motor 12 and one end of the two bidirectional ball screws 15. The drive motor 12 is electrically connected to the touch panel on the armrest frame 4.

[0025] The following are the specific steps for using a retractable reclining chair: Step 1: When it is necessary to switch the reclining chair from a sitting position to a reclining position, the user inputs the desired reclining angle through the touch panel on the armrest frame 4, and simultaneously controls the first electric telescopic cylinder 5 and the second electric telescopic cylinder 9 to push the backrest body 102 and the leg support body 103 to rotate relative to the seat body 101 around the hinge assembly 104. During the rotation process, the angle sensor 17 provides real-time feedback on the rotation angle of the backrest body 102 and the leg support body 103. After the backrest body 102 and the leg support body 103 rotate to the target angle, the first electric telescopic cylinder 5 and the second electric telescopic cylinder 9 are stopped, completing the switch between sitting and reclining modes. Step 2: When it is necessary to adjust the height of the recliner, the drive motor 12 is started through the touch panel on the armrest frame 4 to drive the belt pulley transmission assembly 13 to rotate, which drives the two bidirectional ball screws 15 to rotate synchronously, and drives the two second connecting seats 10 to move closer or further apart along the mounting cavity 14. During the movement of the second connecting seats 10, the support arm 7 is pushed to deflect, thereby driving the chair frame assembly 1 to rise or fall as a whole, thus completing the height adjustment. Step 3: When it is necessary to adjust the bearing area of ​​the base assembly 3, first loosen the locking bolt 308 on the inner side of the support beam 301, pull the support longitudinal beam 303, and the second connecting rod 304 slides out from the telescopic cavity 306. Adjust the overall area of ​​the base composed of the fixed frame and the movable frame, expand the overall support area, and then tighten the locking bolt 308 again to fix the second connecting rod 304. Step 4: Based on the user's preference for seat firmness, activate the inflation / deflation device 16 via the touch panel on the armrest frame 4. Inflate or deflate the airbag 204 with gas through the inflation / deflation device 16, adjust the internal air pressure of each airbag 204, and adjust the overall support firmness of the fabric assembly 2 so that the surface curve of the fabric assembly 2 conforms to the ergonomic curve. Step 5: The fabric component 2 is connected to the chair frame component 1 by the hook side 105 and the loop side 202 of the Velcro. When the fabric component 2 needs to be cleaned, simply tear off the Velcro and remove the fabric component 2 from the chair frame component 1 for cleaning or replacement. After cleaning, reattach it with the Velcro.

[0026] In summary, this invention uses a first electric telescopic cylinder and a second electric telescopic cylinder in conjunction with a hinge assembly to achieve independent angle adjustment between the backrest body and the leg support plate. With the addition of an angle sensor to provide real-time angle data feedback, it can accurately position any posture such as sitting, semi-reclining, or fully reclining. Through the cooperation of a drive motor, a bidirectional ball screw, and a support arm, it can achieve electric height adjustment of the entire chair body, making it suitable for users of different heights, body types, and ages. The base of this invention adopts a telescopic structure combining a fixed frame and front and rear movable frames. The extension length of the second connecting rod can be adjusted by pulling the support longitudinal beam, thereby changing the contact area between the base and the ground. When the center of gravity shifts in a lying position, the support range is actively expanded. With the help of anti-slip rubber pads, it is suitable for various types of ground such as carpets, tiles, and wooden floors, achieving stable support under different weights and shapes. The fabric assembly of this invention has built-in horizontally equidistant airbags. The air pressure of each airbag can be independently adjusted by the inflation and deflation device, which can freely change the softness and hardness of the seat and the surface curve, perfectly conforming to the contours of the human spine, waist, hips and legs, optimizing the pressure distribution, conforming to the biomechanical characteristics of the human body, and eliminating fatigue even after sitting or lying down for a long time. The fabric and the chair frame are detachably connected by Velcro, which can be quickly peeled off for cleaning or replacement.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0028] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A retractable reclining chair, comprising a frame assembly (1), a fabric assembly (2), a base assembly (3), and two armrests (4), wherein the fabric assembly (2) is fitted onto the upper surface of the frame assembly (1), and the two armrests (4) are fixedly mounted on the upper sides of the frame assembly (1), and each armrest (4) is provided with a touch panel, characterized in that: The chair frame assembly (1) includes a seat body (101), a backrest body (102), a leg support body (103), and a hinge assembly (104). The fabric assembly (2) includes a base plate (201), a flexible breathable cover (203), and an airbag (204). The flexible breathable cover (203) is sewn together along the outer edge of the base plate (201). The airbag (204) is horizontally and equidistantly arranged inside the flexible breathable cover (203). The base assembly (3) includes a fixed frame and two movable frames installed at the front and rear ends of the fixed frame.

2. The convertible recliner according to claim 1, characterized in that: An inflation / deflation device (16) is fixedly installed below the seat body (101), and the inflation / deflation device (16) is connected to the airbag (204). The upper ends of the seat body (101), backrest body (102) and leg support body (103) are fixedly installed with Velcro hooks (105), and the lower end of the base plate (201) is fixedly installed with Velcro loops (202). The fabric assembly (2) and the chair frame assembly (1) are glued together by the Velcro hooks (105) and the Velcro loops (202). The inflation / deflation device (16) is electrically connected to the touch panel on the armrest frame (4).

3. A recumbent chair with a changeable form according to claim 1, characterized in that: The fixed frame includes two supporting beams (301) and two first connecting rods (302). The two supporting beams (301) are arranged in parallel, and the two ends of the first connecting rods (302) are welded to the ends of the supporting beams (301). The movable frame includes a supporting longitudinal beam (303) and two second connecting rods (304). The two second connecting rods (304) are welded to the inner side of the supporting longitudinal beam (303). The inner sides of the supporting beams (301) are provided with telescopic cavities (306), and the second connecting rods (304) are slidably installed inside the telescopic cavities (306). Anti-slip rubber pads (305) are fitted and installed on the lower sides of the supporting beams (301) and the supporting longitudinal beams (303). The inner surface of the supporting beams (301) is provided with threaded holes (307), and the threaded holes (307) are connected to the telescopic cavities (306). Locking bolts (308) are installed in the threads of the threaded holes (307).

4. A retractable reclining chair according to claim 1, characterized in that: The backrest body (102) and the leg support body (103) are rotatably connected to the two ends of the seat body (101) via a hinge assembly (104). A hinge seat (8) is fixedly installed on the bottom of the seat body (101), the backrest body (102), the leg support body (103), and the base assembly (3). A first electric telescopic cylinder (5) is installed on the bottom of the backrest body (102). A second electric telescopic cylinder (9) is installed between the seat body (101) and the leg support body (103). Both ends of the first electric telescopic cylinder (5) and the second electric telescopic cylinder (9) are rotatably connected to the hinge seat (8). The first electric telescopic cylinder (5) and the second electric telescopic cylinder (9) are electrically connected to the touch panel on the armrest frame (4).

5. A retractable reclining chair according to claim 1, characterized in that: Two sets of support mechanisms are symmetrically installed below the chair frame assembly (1). The support mechanism includes a first connecting seat (6), a support arm (7), and a second connecting seat (10). The first connecting seat (6) is welded to the base assembly (3). The lower end of the seat body (101) is provided with two mounting cavities (14), and the two mounting cavities (14) are arranged in parallel and symmetrically at the lower end of the seat body (101). The second connecting seat (10) is slidably installed inside the mounting cavity (14). The support arm (7) is installed on the first connecting seat (6) and the second connecting seat (10), and the two ends of the support arm (7) are rotatably connected to the first connecting seat (6) and the second connecting seat (10), respectively.

6. A retractable reclining chair according to claim 1, characterized in that: The mounting cavity (14) is rotatably mounted with a bidirectional ball screw (15), and the bidirectional ball screw (15) is threadedly connected to the second connecting seat (10). A drive motor (12) is embedded in the lower part of the seat body (101). A drive cavity (11) is provided at the lower end of the seat body (101). A belt pulley transmission assembly (13) is rotatably mounted inside the drive cavity (11), and the belt pulley transmission assembly (13) is connected to the output end of the drive motor (12) and one end of the two bidirectional ball screws (15). The drive motor (12) is electrically connected to the touch panel on the armrest frame (4).

7. A retractable reclining chair according to claim 1, characterized in that: An angle sensor (17) is fixedly installed below both the backrest body (102) and the leg support body (103), and the angle sensor (17) is electrically connected to the touch panel on the armrest frame (4).

8. A method of using a retractable reclining chair, characterized in that, The reclining chair, which includes any one of claims 1 to 7, has the following specific operating steps: Step 1: When it is necessary to switch the reclining chair from a sitting position to a reclining position, the user inputs the desired reclining angle through the touch panel on the armrest (4), and simultaneously controls the first electric telescopic cylinder (5) and the second electric telescopic cylinder (9) to push the backrest body (102) and the leg support body (103) to rotate relative to the seat body (101) around the hinge assembly (104). During the rotation process, the angle sensor (17) provides real-time feedback on the rotation angle of the backrest body (102) and the leg support body (103). After the backrest body (102) and the leg support body (103) rotate to the target angle, the first electric telescopic cylinder (5) and the second electric telescopic cylinder (9) are stopped, thus completing the switch between sitting and reclining modes. Step 2: When it is necessary to adjust the height of the recliner, start the drive motor (12) through the touch panel on the armrest frame (4) to drive the belt pulley transmission assembly (13) to rotate, drive the two bidirectional ball screws (15) to rotate synchronously, drive the two second connecting seats (10) to move closer or further apart along the mounting cavity (14), and push the support arm (7) to deflect during the movement of the second connecting seats (10), thereby driving the chair frame assembly (1) to rise or fall as a whole, and complete the height adjustment; Step 3: When it is necessary to adjust the bearing area of ​​the base assembly (3), first loosen the locking bolt (308) on the inner side of the support beam (301), pull the support longitudinal beam (303), and the second connecting rod (304) slides out from the telescopic cavity (306). Adjust the overall area of ​​the base composed of the fixed frame and the movable frame, expand the overall support area, and then tighten the locking bolt (308) again to fix the second connecting rod (304). Step 4: Based on the user's preference for seat firmness, activate the inflation / deflation device (16) via the touch panel on the armrest (4). Inflate or deflate the airbag (204) with gas via the inflation / deflation device (16) to adjust the internal air pressure of each airbag (204) and adjust the overall support firmness of the fabric assembly (2) so that the surface curve of the fabric assembly (2) conforms to the ergonomic curve. Step 5: The fabric component (2) is connected to the chair frame component (1) by the hook side (105) and the loop side (202) of the Velcro. When the fabric component (2) needs to be cleaned, simply tear off the Velcro and remove the fabric component (2) from the chair frame component (1) for cleaning or replacement. After cleaning, reattach it with the Velcro.

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