A hard armrest backrest adjustment telescopic chair structure

Abstract

The utility model discloses a kind of hard armrest backrest adjustment telescopic chair structure, to solve the chair surface two sides edge of folding chair as armrest use, poor durability, inconvenient cleaning, insufficient supporting force, short service life insufficient. The utility model includes chair frame, hard armrest is installed in the both sides of chair frame, chair frame rear side rotationally connects backrest rod, hard armrest telescopic setting, and hard armrest front and rear are respectively rotationally connected with chair frame and backrest rod. The hard armrest of this patent application, good durability, convenient cleaning, large supporting force, long service life, backrest rod inclination angle can be adjusted, hard armrest can be telescopic with backrest adjustment, satisfy different sitting posture demand, improve comfort.

Description

Technical Field

[0001] This utility model relates to a folding chair, and more specifically, to a structure for a rigid armrest and backrest adjustable telescopic chair. Background Technology

[0002] Currently, the armrests of most commonly used camping folding chairs are made of fabric, which has the following drawbacks: 1. Poor durability: Frequent friction and pulling during outdoor use can easily cause the fabric to wear out and tear. 2. Inconvenient cleaning: Fabric materials easily attract dust, dirt, and other stains, making cleaning relatively troublesome. Especially after outdoor activities, the armrests may be stained with stains that are difficult to remove. 3. Insufficient support: Fabric armrests are not as stable as hard material armrests, and may feel unstable or unsafe for users who need strong support. 4. Short lifespan: Due to the above factors, especially in harsh environmental conditions, the lifespan of fabric armrests is often shorter than that of armrests made of other materials. For example, Chinese patent application number 2016100697236 discloses a folding chair, including a seat and a frame, with the two edges of the seat used as armrests, which suffers from poor durability, inconvenient cleaning, insufficient support, and a short lifespan. Utility Model Content

[0003] To overcome the above shortcomings, this utility model provides a rigid armrest and backrest adjustable telescopic chair structure. The armrests are durable, easy to clean, provide strong support, and have a long service life. The armrests can be adjusted and extended with the backrest to meet different sitting posture needs and improve comfort.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a rigid armrest and backrest adjustable telescopic chair structure, including a chair frame, rigid armrests installed on both sides of the chair frame, a backrest rod rotatably connected to the rear side of the chair frame, the rigid armrests being telescopically set, and the front and rear parts of the rigid armrests being rotatably connected to the chair frame and the backrest rod, respectively.

[0005] Hard armrests are installed on both sides of the chair frame, and the front and rear parts of the hard armrests are rotatably connected to the chair frame and the backrest rod, respectively. As the backrest rod rotates to adjust the tilt angle, the hard armrests extend and retract along with the backrest rod, thereby meeting the needs of different sitting postures.

[0006] Hard armrests are durable, easy to clean, provide strong support, and have a long service life. They can also be adjusted and extended to match the backrest, meeting different sitting posture requirements and improving comfort.

[0007] Preferably, the rigid handrail includes a long handrail and a short handrail, which are connected as a set.

[0008] The long and short handrails are connected together to form a rigid handrail, which is easy to extend and adjust in length.

[0009] Preferably, a limiting sleeve is installed at the end of the long handrail, and a guide plug is installed at the end of the short handrail. The guide plug is appropriately installed in the long handrail, and the limiting pipe limits the guide plug.

[0010] During the extension and retraction of the long and short handrails, the guide plug moves along the long handrail to ensure smooth movement. The limiting pipe restricts the guide plug, preventing it from detaching from the long handrail.

[0011] Preferably, a joint is installed at the front of the rigid armrest, a vertical bar is provided at the front of the chair frame, and a rotating mechanism is installed between the joint and the vertical bar.

[0012] A rotating mechanism is installed between the joint and the vertical bar on the rigid handrail to ensure flexible rotation of the front part of the rigid handrail.

[0013] Preferably, the rotating mechanism includes a soft sleeve and a round plug, with a universal ball head provided on the round plug and a rotating ball groove provided on the soft sleeve, and the universal ball head and the rotating ball groove being adapted to each other.

[0014] The omnidirectional ball joint on the round-headed plug is fitted and connected to the rotating ball groove on the soft sleeve, allowing the front of the hard armrest to rotate omnidirectionally and preventing jamming. The soft sleeve has the flexibility to move and prevents scratches to the user.

[0015] Preferably, the backrest rod is fastened to the connecting tube seat, and the rear of the rigid armrest is rotatably connected to the connecting tube seat.

[0016] The tube base facilitates the connection between the hard armrest and the backrest bar.

[0017] As a preferred option, the chair frame is provided with limiting guide holes, and the backrest rod is movably inserted into the limiting guide holes.

[0018] The limiting guide hole serves to limit the backrest rod, preventing it from tipping over.

[0019] Preferably, the chair frame is equipped with a sliding switch adjustment sleeve, and the lower part of the backrest rod is rotatably connected to the switch adjustment sleeve.

[0020] The switch adjustment sleeve slides to adjust the position of the backrest bar to meet different sitting posture requirements.

[0021] Preferably, a locking button is rotatably connected to the switch adjustment sleeve, a limit pin is provided on the locking button, several locking holes are provided at intervals on the chair frame, a positioning spring is installed between the locking button and the switch adjustment sleeve, and the limit pin is inserted into the locking hole.

[0022] Before the switch adjusting sleeve slides, press the locking button to disengage the limit pin from the locking hole. After the switch adjusting sleeve slides into place, the limit pin inserts into the locking hole, thus locking and positioning the switch adjusting sleeve.

[0023] Preferably, the chair frame includes several circumferentially spaced support assemblies, with an X-shaped support frame hinged between adjacent support assemblies. Each support assembly includes an upper support and a lower support, both of which are hinged to the support frame.

[0024] Each adjacent support assembly is hinged with an X-shaped support frame, ensuring the stability of the entire chair frame. To fold or store the chair, simply fold up the X-shaped support frame.

[0025] Compared with the prior art, the beneficial effects of this utility model are: (1) The rigid armrest of this patent application is durable, easy to clean, has great support force and long service life. The tilt angle of the backrest rod can be adjusted, and the rigid armrest can be extended and retracted with the backrest to meet different sitting posture requirements and improve comfort; (2) During the extension and retraction of the long armrest and the short armrest, the guide plug moves on the long armrest rod to ensure the smoothness of the extension and retraction movement, while the limiting pipe limits the guide plug to prevent the guide plug from detaching from the long armrest rod; (3) The lower part of the backrest rod is rotatably connected to the switch adjustment sleeve, and the switch adjustment sleeve slides to adjust the position of the backrest rod to meet different sitting posture requirements. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this utility model.

[0027] Figure 2 This is an exploded view of the rigid handrail connection of this utility model.

[0028] Figure 3 This is a connection diagram of the switch adjustment sleeve of this utility model.

[0029] Figure 4 This is a structural diagram of the rotating mechanism of Embodiment 1 of this utility model.

[0030] Figure 5 This is a structural diagram of the rotating mechanism of Embodiment 2 of this utility model.

[0031] In the diagram: 1. Chair frame; 2. Hard armrest; 3. Backrest rod; 4. Long armrest rod; 5. Short armrest rod; 6. Limiting sleeve; 7. Elastic tongue; 8. Positioning protrusion; 9. Positioning hole; 10. Protrusion ring; 11. Guide plug; 12. Connector; 13. Connecting spring tongue; 14. Positioning pin; 15. Pin hole; 16. Connector; 17. Vertical rod; 18. Horizontal connecting hole; 19. Vertical connecting hole; 20. Soft sleeve; 21. Round-headed plug; 22. 23. Universal ball joint, 24. Rotating ball groove, 25. Connecting ear, 26. Connecting groove, 27. Tube seat, 28. Mounting hole, 29. U-shaped groove, 30. Pin shaft, 31. Limiting guide hole, 32. Switch adjusting sleeve, 33. Hinge groove, 34. Locking button, 35. Limiting pin, 36. Locking hole, 37. Support assembly, 38. Support frame, 39. Upper support, 40. Lower support, 41. Extension tube, 42. Support rod, 43. Mounting ear. Detailed Implementation

[0032] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings: Example 1: A structure for a rigid armrest and backrest adjustable telescopic chair (see...) Figure 1 , Figure 2 , Figure 3 , Figure 4 The chair includes a chair frame 1, which is foldable. Both sides of the chair frame 1 are equipped with hard armrests 2. The backrest 3 is rotatably connected to the rear of the chair frame 1. The backrest 3 is inclined. Both the hard armrests 2 and the backrest 3 are hollow tubular structures. The hard armrests 2 are telescopic. The front and rear parts of the hard armrests 2 are rotatably connected to the chair frame 1 and the backrest 3, respectively.

[0033] The rigid handrail 2 includes a long handrail 4 and a short handrail 5, which are fitted together. This fitted connection of the long handrail 4 and short handrail 5 forms the rigid handrail 2, facilitating length adjustment. The long handrail 4 is at the front, and the short handrail 5 is at the rear; the long handrail 4 is thicker, and the short handrail 5 is thinner. A limiting sleeve 6 is installed at the end of the long handrail 4, fitting into the inner wall of the long handrail 4. An elastic tongue 7 is provided on the limiting sleeve 6, and a positioning protrusion 8 is provided on the elastic tongue 7. A positioning hole 9 is provided on the side wall of the long handrail 4, and the positioning protrusion 8 is inserted into the positioning hole 9 for positioning, thus achieving axial positioning of the limiting sleeve and the long handrail 4. A raised ring 10 is provided on the outer wall of the end of the limiting sleeve 6, and the raised ring 10 abuts against the end face of the long handrail 4. A guide plug 11 is installed at the end of the short handrail 5. The guide plug 11 is adapted to be installed in the long handrail 4. The limiting pipe limits the guide plug 11.

[0034] A connector 1612 is provided on the guide plug 11. The connector 1612 is fitted into the inner wall of the handrail short rod 5. A spring tongue 13 is provided on the connector 1612. A positioning pin 14 is provided on the spring tongue 13. A pin hole 15 is provided on the side wall of the handrail short rod 5. The positioning pin 14 is inserted into the pin hole 15 for positioning, thereby realizing the axial positioning of the guide plug 11 and the handrail short rod 5.

[0035] During the telescopic movement of the long handrail 4 and the short handrail 5, the guide plug 11 moves along the long handrail 4 to ensure the smoothness of the telescopic movement. The limiting pipe limits the guide plug 11 to prevent it from disengaging from the long handrail 4.

[0036] A connector 16 is installed at the front of the hard armrest 2, and a vertical rod 17 is provided at the front of the chair frame 1. A rotating mechanism is installed between the connector 16 and the vertical rod 17. The connector 16 has an L-shaped structure, including a horizontal connecting hole 18 and a vertical connecting hole 19. The horizontal connecting hole 18 is inserted into the hard armrest 2 and fastened by screws. The rotating mechanism is installed between the vertical connecting hole 19 and the vertical rod 17.

[0037] The rotating mechanism includes a flexible sleeve 20 and a round-headed plug 21. A universal ball joint 22 is provided on the round-headed plug 21, and a rotating ball groove 23 is provided on the flexible sleeve 20. The universal ball joint 22 is adapted to and connected to the rotating ball groove 23. In this application, the flexible sleeve 20 is fastened to the connector 16, and the round-headed plug 21 is connected to the vertical rod 17. Two connecting ears 24 are provided on the outer wall of the flexible sleeve 20, and two connecting grooves 25 corresponding to the connecting ears 24 are provided on the connector 16. The connecting grooves 25 communicate with the vertical connecting hole 19. The flexible sleeve 20 is inserted into the vertical connecting hole 19, and the connecting ears 24 are inserted into the connecting grooves 25. Fastening screws are connected to the connecting ears 24, and the fastening screws are fastened to the connector 16. The vertical rod 17 has a tubular structure, and the round-headed plug 21 is adapted to be inserted into the upper end of the vertical rod 17. The universal ball joint 22 is located on the upper end of the round-headed plug 21. The universal ball joint 22 on the round plug 21 is adapted to connect with the rotating ball groove 23 on the soft sleeve 20, thereby enabling the front of the hard armrest 2 to rotate in all directions and avoid jamming. The soft sleeve 20 has the flexibility to move, preventing scratches to the user.

[0038] A connecting tube seat 26 is fastened to the backrest rod 3, and the rear of the rigid armrest 2 is rotatably connected to the connecting tube seat 26. The connecting tube seat 26 has mounting holes 27 and a U-shaped groove 28. The connecting tube seat 26 is fitted to the backrest rod 3 through the mounting holes 27, and the connecting tube seat 26 and the backrest rod 3 are fastened together with screws. A pin 29 is installed in the U-shaped groove 28, and the rear end of the rigid armrest 2 is rotatably connected to the pin 29, with the rear end of the rigid armrest 2 placed in the U-shaped groove 28. The connecting tube seat 26 facilitates the connection between the rigid armrest 2 and the backrest rod 3.

[0039] A limiting guide hole 30 is provided on the chair frame 1. The backrest rod 3 is movably inserted into the limiting guide hole 30, and the diameter of the limiting guide hole 30 is larger than the outer diameter of the backrest rod 3. The limiting guide hole 30 plays a limiting role in preventing the backrest rod 3 from tipping over.

[0040] A sliding switch adjustment sleeve 31 is provided on the chair frame 1, and the lower part of the backrest rod 3 is rotatably connected to the switch adjustment sleeve 31. The switch adjustment sleeve 31 is provided with a hinge groove 32, and the lower part of the backrest rod 3 is hinged in the hinge groove 32 through a hinge shaft. A locking button 33 is rotatably connected to the switch adjustment sleeve 31. The locking button 33 is provided with anti-slip texture and a limit pin 34. Several locking holes 35 are provided at intervals on the chair frame 1. A positioning spring is installed between the locking button 33 and the switch adjustment sleeve 31, and the limit pin 34 is inserted into the locking hole 35.

[0041] The switch adjustment sleeve 31 slides to adjust the position of the backrest rod 3 to meet different sitting posture requirements. Before the switch adjustment sleeve 31 slides, press the locking button 33 to disengage the limit pin 34 from the locking hole 35. After the switch adjustment sleeve 31 slides to the position, the limit pin 34 is inserted into the locking hole 35 to lock and position the switch adjustment sleeve 31.

[0042] The chair frame 1 includes several circumferentially spaced support assemblies 36, and an X-shaped support frame 37 is hinged between each pair of adjacent support assemblies 36. Each support assembly 36 includes an upper support 38 and a lower support 39, and both the upper support 38 and the lower support 39 are hinged to the support frame 37.

[0043] In this embodiment, four supports are arranged between the supports. The two upper supports 38 on the front side each have an extension tube 40. The lower part of the vertical rod 17 is inserted into the lower support 39, and the upper part of the vertical rod 17 passes through the extension tube 40. The support frame 37 includes two support rods 41, which are hinged together at the middle. The upper end of the support rod 41 is hinged to the upper support 38, and the lower end of the support rod 41 is hinged to the lower support 39. The two upper supports 38 on the rear side each have a limiting guide hole 30. Two switch adjustment sleeves 31 are slidably connected to the left and right support rods 41. The lower support 39 provides support for the entire folding chair.

[0044] Hard armrests 2 are installed on both sides of the chair frame 1. The front and rear parts of the hard armrests 2 are rotatably connected to the chair frame 1 and the backrest rod 3, respectively. During the adjustment of the tilt angle by rotating the backrest rod 3, the hard armrests 2 extend and retract along with the backrest rod 3, thereby meeting different sitting posture requirements. The hard armrests 2 are durable, easy to clean, provide strong support, and have a long service life. When adjusting the tilt angle of the backrest rod 3, pressing the locking button 33 causes the limit pin 34 to disengage from the locking hole 35. The switch adjustment sleeve 31 slides to adjust the tilt angle of the backrest rod 3. After the switch adjustment sleeve 31 slides into place, the limit pin 34 is inserted into the locking hole 35 to lock and position the switch adjustment sleeve 31.

[0045] Example 2: A structure for a rigid armrest and backrest adjustable telescopic chair (see...) Figure 1 , Figure 2 , Figure 3 , Figure 5 The chair includes a chair frame 1, which is foldable. Both sides of the chair frame 1 are equipped with hard armrests 2. The backrest 3 is rotatably connected to the rear of the chair frame 1. The backrest 3 is inclined. Both the hard armrests 2 and the backrest 3 are hollow tubular structures. The hard armrests 2 are telescopic. The front and rear parts of the hard armrests 2 are rotatably connected to the chair frame 1 and the backrest 3, respectively.

[0046] The rigid handrail 2 includes a long handrail 4 and a short handrail 5, which are fitted together. This fitted connection of the long handrail 4 and short handrail 5 forms the rigid handrail 2, facilitating length adjustment. The long handrail 4 is at the front, and the short handrail 5 is at the rear; the long handrail 4 is thicker, and the short handrail 5 is thinner. A limiting sleeve 6 is installed at the end of the long handrail 4, fitting into the inner wall of the long handrail 4. An elastic tongue 7 is provided on the limiting sleeve 6, and a positioning protrusion 8 is provided on the elastic tongue 7. A positioning hole 9 is provided on the side wall of the long handrail 4, and the positioning protrusion 8 is inserted into the positioning hole 9 for positioning, thus achieving axial positioning of the limiting sleeve and the long handrail 4. A raised ring 10 is provided on the outer wall of the end of the limiting sleeve 6, and the raised ring 10 abuts against the end face of the long handrail 4. A guide plug 11 is installed at the end of the short handrail 5. The guide plug 11 is adapted to be installed in the long handrail 4. The limiting pipe limits the guide plug 11.

[0047] A connector 1612 is provided on the guide plug 11. The connector 1612 is fitted into the inner wall of the handrail short rod 5. A spring tongue 13 is provided on the connector 1612. A positioning pin 14 is provided on the spring tongue 13. A pin hole 15 is provided on the side wall of the handrail short rod 5. The positioning pin 14 is inserted into the pin hole 15 for positioning, thereby realizing the axial positioning of the guide plug 11 and the handrail short rod 5.

[0048] During the telescopic movement of the long handrail 4 and the short handrail 5, the guide plug 11 moves along the long handrail 4 to ensure the smoothness of the telescopic movement. The limiting pipe limits the guide plug 11 to prevent it from disengaging from the long handrail 4.

[0049] A connector 16 is installed at the front of the hard armrest 2, and a vertical rod 17 is provided at the front of the chair frame 1. A rotating mechanism is installed between the connector 16 and the vertical rod 17. The connector 16 has an L-shaped structure, including a horizontal connecting hole 18 and a vertical connecting hole 19. The horizontal connecting hole 18 is inserted into the hard armrest 2 and fastened by screws. The rotating mechanism is installed between the vertical connecting hole 19 and the vertical rod 17.

[0050] The rotating mechanism includes a flexible sleeve 20 and a round-headed plug 21. A universal ball joint 22 is provided on the round-headed plug 21, and a rotating ball groove 23 is provided on the flexible sleeve 20. The universal ball joint 22 is adapted to and connected to the rotating ball groove 23. In this application, the flexible sleeve 20 is fastened to the vertical rod 17, and the round-headed plug 21 is connected to the connector 16. Two mounting ears 42 are provided on the outer wall of the round-headed plug 21, and two connecting grooves 25 corresponding to the mounting ears 42 are provided on the connector 16. The connecting grooves 25 communicate with the vertical connecting hole 19, the round-headed plug 21 is inserted into the vertical connecting hole 19, the mounting ears 42 are inserted into the connecting grooves 25, and fastening screws are connected to the mounting ears 42. The fastening screws are connected and fastened to the connector 16. The vertical rod 17 has a tubular structure, the flexible sleeve 20 is adapted to be inserted into the upper end of the vertical rod 17, and the universal ball joint 22 is located at the lower end of the round-headed plug 21. The universal ball joint 22 on the round plug 21 is adapted to the rotating ball groove 23 on the soft sleeve 20, so that the front of the hard handrail 2 can rotate in all directions and avoid jamming.

[0051] A connecting tube seat 26 is fastened to the backrest rod 3, and the rear of the rigid armrest 2 is rotatably connected to the connecting tube seat 26. The connecting tube seat 26 has mounting holes 27 and a U-shaped groove 28. The connecting tube seat 26 is fitted to the backrest rod 3 through the mounting holes 27, and the connecting tube seat 26 and the backrest rod 3 are fastened together with screws. A pin 29 is installed in the U-shaped groove 28, and the rear end of the rigid armrest 2 is rotatably connected to the pin 29, with the rear end of the rigid armrest 2 placed in the U-shaped groove 28. The connecting tube seat 26 facilitates the connection between the rigid armrest 2 and the backrest rod 3.

[0052] A limiting guide hole 30 is provided on the chair frame 1. The backrest rod 3 is movably inserted into the limiting guide hole 30, and the diameter of the limiting guide hole 30 is larger than the outer diameter of the backrest rod 3. The limiting guide hole 30 plays a limiting role in preventing the backrest rod 3 from tipping over.

[0053] A sliding switch adjustment sleeve 31 is provided on the chair frame 1, and the lower part of the backrest rod 3 is rotatably connected to the switch adjustment sleeve 31. The switch adjustment sleeve 31 is provided with a hinge groove 32, and the lower part of the backrest rod 3 is hinged in the hinge groove 32 through a hinge shaft. A locking button 33 is rotatably connected to the switch adjustment sleeve 31. The locking button 33 is provided with anti-slip texture and a limit pin 34. Several locking holes 35 are provided at intervals on the chair frame 1. A positioning spring is installed between the locking button 33 and the switch adjustment sleeve 31, and the limit pin 34 is inserted into the locking hole 35.

[0054] The switch adjustment sleeve 31 slides to adjust the position of the backrest rod 3 to meet different sitting posture requirements. Before the switch adjustment sleeve 31 slides, press the locking button 33 to disengage the limit pin 34 from the locking hole 35. After the switch adjustment sleeve 31 slides to the position, the limit pin 34 is inserted into the locking hole 35 to lock and position the switch adjustment sleeve 31.

[0055] The chair frame 1 includes several circumferentially spaced support assemblies 36, and an X-shaped support frame 37 is hinged between each pair of adjacent support assemblies 36. Each support assembly 36 includes an upper support 38 and a lower support 39, and both the upper support 38 and the lower support 39 are hinged to the support frame 37.

[0056] In this embodiment, four supports are arranged between the supports. The two upper supports 38 on the front side each have an extension tube 40. The lower part of the vertical rod 17 is inserted into the lower support 39, and the upper part of the vertical rod 17 passes through the extension tube 40. The support frame 37 includes two support rods 41, which are hinged together at the middle. The upper end of the support rod 41 is hinged to the upper support 38, and the lower end of the support rod 41 is hinged to the lower support 39. The two upper supports 38 on the rear side each have a limiting guide hole 30. Two switch adjustment sleeves 31 are slidably connected to the left and right support rods 41. The lower support 39 provides support for the entire folding chair.

[0057] Hard armrests 2 are installed on both sides of the chair frame 1. The front and rear parts of the hard armrests 2 are rotatably connected to the chair frame 1 and the backrest rod 3, respectively. During the adjustment of the tilt angle by rotating the backrest rod 3, the hard armrests 2 extend and retract along with the backrest rod 3, thereby meeting different sitting posture requirements. The hard armrests 2 are durable, easy to clean, provide strong support, and have a long service life. When adjusting the tilt angle of the backrest rod 3, pressing the locking button 33 causes the limit pin 34 to disengage from the locking hole 35. The switch adjustment sleeve 31 slides to adjust the tilt angle of the backrest rod 3. After the switch adjustment sleeve 31 slides into place, the limit pin 34 is inserted into the locking hole 35 to lock and position the switch adjustment sleeve 31.

[0058] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A structure for a rigid armrest and backrest adjustable telescopic chair, characterized in that, The chair includes a chair frame with hard armrests on both sides. The backrest is rotatably connected to the rear of the chair frame. The hard armrests are telescopic, and the front and rear parts of the hard armrests are rotatably connected to the chair frame and the backrest, respectively.

2. The adjustable and retractable chair structure with hard armrests and backrest according to claim 1, characterized in that, The rigid handrail consists of a long handrail bar and a short handrail bar, which are connected as a set.

3. The adjustable and retractable chair structure with hard armrests and backrest according to claim 2, characterized in that, A limiting sleeve is installed at the end of the long handrail, and a guide plug is installed at the end of the short handrail. The guide plug is fitted into the long handrail, and the limiting pipe limits the guide plug.

4. The adjustable and retractable chair structure with hard armrests and backrest according to claim 1, characterized in that, A connector is installed at the front of the rigid armrest, and a vertical bar is installed at the front of the chair frame. A rotating mechanism is installed between the connector and the vertical bar.

5. The adjustable and retractable chair structure with hard armrests and backrest according to claim 4, characterized in that, The rotating mechanism includes a soft sleeve and a round-headed plug. The round-headed plug is provided with a universal ball joint, and the soft sleeve is provided with a rotating ball groove. The universal ball joint and the rotating ball groove are adapted to each other for connection.

6. The adjustable and retractable chair structure with hard armrests and backrest according to claim 1, characterized in that, The backrest is fastened to the connecting tube seat, and the rear of the rigid armrest is rotatably connected to the tube seat.

7. The adjustable and retractable chair structure with hard armrests and backrest according to claim 1, characterized in that, The chair frame is equipped with limiting guide holes, and the backrest rod is movably inserted into the limiting guide holes.

8. The adjustable and retractable chair structure with hard armrests and backrest according to claim 1, characterized in that, The chair frame is equipped with a sliding switch adjustment sleeve, and the lower part of the backrest rod is rotatably connected to the switch adjustment sleeve.

9. The adjustable and retractable chair structure with hard armrests and backrest according to claim 8, characterized in that, A locking button is rotatably connected to the switch adjustment sleeve. A limit pin is set on the locking button. Several locking holes are set at intervals on the chair frame. A positioning spring is installed between the locking button and the switch adjustment sleeve. The limit pin is inserted into the locking hole.

10. A retractable chair structure with adjustable hard armrests and backrest according to any one of claims 1 to 9, characterized in that, The chair frame includes several circumferentially spaced support assemblies, with an X-shaped support frame hinged between each pair of adjacent support assemblies. Each support assembly includes an upper support and a lower support, both of which are hinged to the support frame.

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