Beach chair with adjustable backrest

Abstract

The utility model discloses a beach chair with an adjustable backrest, and aims to overcome the defects that the height of the backrest of the beach chair cannot be adjusted, and the sitting comfort is reduced. The seat comprises a seat body, a backrest is arranged on the seat body, a rotatable backrest supporting rod is installed on the backrest, the backrest comprises a fixed backrest rod and a movable backrest rod, and the lower portion of the movable backrest rod is movably connected with the upper portion of the fixed backrest rod in an inserted mode. And the lower part of the movable backrest rod slides up and down along the fixed backrest rod to adjust the height of the whole backrest. According to the beach chair with the adjustable backrest, the height of the backrest can be telescopically adjusted, and the sitting comfort is good.

Description

Technical Field

[0001] The utility model relates to the technical field of folding chairs, and more particularly to a beach chair with an adjustable backrest. Background Art

[0002] As a leisure chair, beach chairs are foldable and easy to carry, making them widely used in outdoor activities. People have high demands for riding comfort when riding on beach chairs for outdoor leisure activities. However, the backrests of common beach chairs on the market cannot adapt to the height of each person during use, and the backrest height of beach chairs cannot be adjusted, which reduces riding comfort. Utility Model Content

[0003] In order to overcome the above-mentioned shortcomings, the utility model provides a beach chair with an adjustable backrest, the backrest height of which can be telescopically adjusted, and the riding comfort is good.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions: a beach chair with an adjustable backrest, comprising a seat body, a backrest arranged on the seat body, a rotatable backrest support rod installed on the backrest, the backrest comprising a fixed backrest rod and a movable backrest rod, the lower part of the movable backrest rod is movably connected to the upper part of the fixed backrest rod, and the lower part of the movable backrest rod slides up and down along the fixed backrest rod to achieve adjustment of the entire backrest height.

[0005] The beach chair's backrest consists of a fixed backrest rod and a movable backrest rod that are movably connected. The movable backrest rod can be moved up and down to adjust the position, thereby adjusting the entire backrest height and improving riding comfort. When the beach chair is unfolded, the lower end of the backrest support rod is rotated backward. When the backrest support rod is unfolded, it supports the entire backrest and ensures the stability of the beach chair.

[0006] The backrest height of the beach chair with adjustable backrest disclosed in this patent application can be adjusted telescopically, and the riding comfort is good.

[0007] Preferably, the backrest is connected to a spring buckle, a spring column is provided on the spring buckle, and positioning holes are provided on the fixed backrest rod and the movable backrest rod. The spring column is plugged into the two positioning holes to realize the positioning of the fixed backrest rod and the movable backrest rod.

[0008] After the movable backrest rod moves upward to a high position, the positioning holes on the fixed backrest rod and the movable backrest rod are aligned, and the elastic columns provided on the spring buckle are inserted into the two positioning holes to realize the positioning of the fixed backrest rod and the movable backrest rod.

[0009] Preferably, a push buckle is installed on the backrest support rod, and after the backrest support rod is flipped downward, the push buckle is pushed onto the elastic column to push the elastic column to move.

[0010] When the movable backrest rod needs to be moved, the backrest support rod is flipped downward to push the buckle onto the spring column. The backrest support rod and the backrest are held close to each other, thereby pressing the spring column inward to unlock it. After that, the movable backrest rod can be slid, which is easy to operate.

[0011] Preferably, the fixed backrest rod and the movable backrest rod are both tubular structures, and the lower portion of the movable backrest rod is inserted into the fixed backrest rod.

[0012] The tubular structure is not only easy to plug and connect, but also saves materials and reduces costs. The lower part of the movable backrest rod slides in the fixed backrest rod, which is stable and reliable.

[0013] Preferably, a positioning sleeve is installed at the upper end of the fixed backrest rod, and an inwardly protruding limiting flange is provided on the positioning sleeve. A limiting plate is connected to the outer wall of the movable backrest rod, and the limiting plate is placed between the movable backrest rod and the fixed backrest rod, and the limiting flange blocks the limiting plate.

[0014] The arrangement of the positioning sleeve and the limiting piece can prevent the movable backrest rod from being separated from the fixed backrest rod during the upward movement, thereby ensuring the safety of the entire beach chair.

[0015] Preferably, the limiting piece is in an arc-shaped structure, a boss is provided on the limiting piece, a socket is provided on the movable backrest rod, the boss and the socket are plug-connected, and the limiting piece fits closely with the outer wall of the movable backrest rod.

[0016] The limit plate is arc-shaped and adapts to the outer wall of the movable backrest rod. The limit plate is connected to the movable backrest rod through a convex column. The limit plate moves with the movable backrest rod. During the movement, the limit plate is always placed between the movable backrest rod and the fixed backrest rod, and there will be no interference or jamming.

[0017] Preferably, a plurality of spring tongues are provided on the positioning sleeve, protrusions are provided on the spring tongues, and clamping holes are provided on the fixed backrest rod corresponding to the protrusions, and the protrusions are connected with the clamping holes by clamping.

[0018] The positioning sleeve and the fixed backrest rod are positioned by the protrusion on the spring tongue and the clamping hole on the fixed backrest rod, and the connection is reliable. In addition, the spring tongue has a certain elasticity, which facilitates the assembly of the positioning sleeve and the fixed backrest rod.

[0019] Preferably, an end plug is installed at the lower end of the movable backrest rod, and a "cross" shaped groove is provided on the upper end surface of the end plug. The end of the end plug protrudes outward to form a convex edge, and the convex edge is close to the end of the movable backrest rod.

[0020] Installing an end plug at the lower end of the movable backrest rod improves its structural strength and prevents deformation. The cross-shaped groove provides a certain degree of elasticity at the upper end of the end plug, facilitating its insertion into the movable backrest rod. The raised edge acts as a limiter to prevent the end plug from being overinstalled.

[0021] Preferably, the backrest support rod is connected to the movable backrest rod of the backrest, the upper end of the backrest support rod is fastened to an "L"-shaped support rod connector, and the support rod connector is rotatably mounted on the movable backrest rod.

[0022] The "L"-shaped support rod connector facilitates the connection between the backrest support rod and the movable backrest rod.

[0023] In another solution, the fixed backrest rod and the movable backrest rod are both tubular structures, and the upper portion of the fixed backrest rod is movably inserted into the movable backrest rod.

[0024] In this solution, the upper part of the fixed backrest rod slides in the movable backrest rod, which is stable and reliable.

[0025] Compared with the prior art, the beneficial effects of the present invention are: (1) the backrest height of the beach chair with adjustable backrest of the patent application can be adjusted telescopically, and the riding comfort is good; (2) there will be no separation between the fixed backrest rod and the movable backrest rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural diagram of the present utility model.

[0027] Figure 2 It is a sectional view of the backrest of the present utility model.

[0028] Figure 3 It is a partial cross-sectional view of the backrest of the present invention.

[0029] Figure 4 It is a partial cross-sectional view of the backrest of the utility model in another direction.

[0030] Figure 5 It is an exploded view of the backrest of the present invention.

[0031] Figure 6 It is a partial cross-sectional view of the backrest of Example 2 of the present utility model.

[0032] Figure 7 It is a partial cross-sectional view of the backrest of Example 3 of the present utility model.

[0033] Figure 8 This is a schematic diagram of the connection of the inflation mechanism of Example 3 of the present utility model.

[0034] In the figure: 1, front support leg, 2, rear support leg, 3, seat rod, 4, limit rod, 5, support, 6, armrest, 7, reinforcement cross bar, 8, backrest support rod, 9, fixed backrest rod, 10, movable backrest rod, 11, spring buckle, 12, spring column, 13, positioning hole, 14, push buckle, 15, support rod connector, 16, positioning sleeve, 17, limit flange, 18, limit plate, 19, boss, 20. Socket, 21. Airbag, 22. Inflating tube, 23. Inflating mechanism, 24. Inflating cylinder, 25. Piston, 26. Piston rod, 27. Reversing sleeve, 28. Pushing part, 29. Pushing surface, 30. Guide surface, 31. Positioning spring, 32. Telescopic column, 33. Driving surface, 34. Spring tongue, 35. Protrusion, 36. Clamping hole, 37. End plug, 38. Clamping column, 39. Limiting hole. DETAILED DESCRIPTION

[0035] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0036] Example 1: A beach chair with adjustable backrest (see attached Figure 1 To the attached Figure 5 ), comprising a seat body, on which a backrest is arranged, the seat body comprising a front support leg 1 and a rear support leg 2, both of which are U-shaped structures with an opening facing upwards, the upper end of the front support leg 1 and the upper end of the rear support leg 2 being hinged together, a seat rod 3 being connected between the front support leg 1 and the backrest, and the seat rod 3 being a U-shaped structure with an opening facing forwards. The lower end of the backrest rod is rotatably connected to a U-shaped limit rod 4, the lower end of the limit rod 4 being hinged to the rear support leg 2, and the upper end of the limit rod 4 being abutted against the rear support leg 2 to achieve limited support. The lower end of the backrest rod is hinged to a U-shaped support 5, the front part of the seat rod 3 being rotatably connected to the front support leg 1, and the rear part of the seat rod 3 being rotatably connected to the support 5. An armrest 6 is rotatably connected to the backrest, and a sliding member capable of adjusting the position forward and backward is installed on the armrest 6, and the upper end of the front support leg 1 and the upper end of the rear support leg 2 are both connected to the sliding member. A reinforcing cross bar 7 is connected to the front support leg 1.

[0037] A rotatable backrest support rod 8 is installed on the backrest. The backrest support rod 8 is a U-shaped structure with the opening facing upward. The backrest includes a fixed backrest rod 9 and a movable backrest rod 10. The movable backrest rod 10 is a U-shaped structure with the opening facing downward. Two fixed backrest rods 9 are provided on the left and right. The lower part of the movable backrest rod 10 is movably connected to the upper parts of the two fixed backrest rods 9. The lower part of the movable backrest rod 10 slides up and down along the fixed backrest rod 9 to achieve adjustment of the entire backrest height.

[0038] The backrest is connected to a spring-loaded catch 11, which is a V-shaped structure. A spring-loaded post 12 is provided on the spring-loaded catch 11. Positioning holes 13 are provided on both the fixed backrest rod 9 and the movable backrest rod 10. The positioning hole 13 on the fixed backrest rod 9 is located near its upper portion. The spring-loaded post 12 is plugged into and connected to the two positioning holes 13 to achieve positioning of the fixed backrest rod 9 and the movable backrest rod 10. A push-button 14 is installed on the backrest support rod 8. After the backrest support rod 8 is flipped downward, the push-button 14 presses against the spring-loaded post 12 to push the spring-loaded post 12 to move. The backrest support rod 8 is connected to the movable backrest rod 10 of the backrest. The upper end of the backrest support rod 8 is fastened to an "L"-shaped support rod connector 15, which is rotatably mounted on the movable backrest rod 10.

[0039] Both the fixed backrest rod 9 and the movable backrest rod 10 are tubular structures, with the lower portion of the movable backrest rod 10 inserted into the fixed backrest rod 9. A positioning sleeve 16 is mounted on the upper end of the fixed backrest rod 9. The positioning sleeve 16 is provided with a limiting flange 17 with an inward protrusion 35, which is located at the inner edge of the upper end of the positioning sleeve 16. A limiting plate 18 is connected to the outer wall of the movable backrest rod 10. The limiting plate 18 is positioned between the movable backrest rod 10 and the fixed backrest rod 9, and the limiting flange 17 blocks the limiting plate 18. The limiting plates 18 are arranged in two opposing arc-shaped pieces. Each of the limiting plates 18 is provided with a protrusion 19, which is inserted into a socket 20 on the movable backrest rod 10. The protrusion 19 is inserted into the socket 20, and the limiting plates 18 fit closely against the outer wall of the movable backrest rod 10. As the movable backrest rod 10 moves up and down, the limiting plates 18 move synchronously with the movable backrest rod 10.

[0040] The positioning sleeve 16 is provided with a plurality of spring tongues 34. In this embodiment, two spring tongues 34 are evenly distributed around the circumference. Each spring tongue 34 is provided with a protrusion 35. A corresponding locking hole 36 is provided on the fixed backrest rod 9, and the protrusion 35 is snap-fitted into the locking hole 36. An end plug 37 is mounted on the lower end of the movable backrest rod 10. The upper end surface of the end plug 37 is provided with a cross-shaped groove. The end of the end plug 37 protrudes outward to form a ridge, which engages the end of the movable backrest rod 10. An outwardly protruding locking post 38 is provided on the outer wall of the end plug 37. A stopper hole 39 is provided on the movable backrest rod 10, corresponding to the locking post 38. The locking post 38 is snap-fitted into the stopper hole 39.

[0041] The backrest of the beach chair is composed of a fixed backrest rod 9 and a movable backrest rod 10, which are movably connected. The movable backrest rod 10 can be moved up and down to adjust its position, thereby adjusting the height of the entire backrest and improving riding comfort. When the beach chair is unfolded for use, the lower end of the backrest support rod 8 is rotated backward. When the backrest support rod 8 is unfolded, it supports the entire backrest and ensures the stability of the beach chair.

[0042] After the movable backrest rod 10 moves upward to the high position, the positioning holes 13 on the fixed backrest rod 9 and the movable backrest rod 10 are aligned, and the elastic columns 12 provided on the spring buckle 11 are inserted into the two positioning holes 13 to achieve the positioning of the fixed backrest rod 9 and the movable backrest rod 10. When the movable backrest rod 10 needs to be moved, the backrest support rod 8 is flipped downward so that the push buckle 14 hits the elastic column 12. The backrest support rod 8 and the backrest are held close to each other, thereby pressing the elastic column 12 inward to unlock it. After that, the movable backrest rod 10 can be slid, which is convenient to operate.

[0043] Example 2: A beach chair with adjustable backrest (see attached Figure 6 ), comprising a seat body, on which a backrest is arranged, the seat body comprising a front support leg 1 and a rear support leg 2, both of which are U-shaped structures with an opening facing upwards, the upper end of the front support leg 1 and the upper end of the rear support leg 2 being hinged together, a seat rod 3 being connected between the front support leg 1 and the backrest, and the seat rod 3 being a U-shaped structure with an opening facing forwards. The lower end of the backrest rod is rotatably connected to a U-shaped limit rod 4, the lower end of the limit rod 4 being hinged to the rear support leg 2, and the upper end of the limit rod 4 being abutted against the rear support leg 2 to achieve limited support. The lower end of the backrest rod is hinged to a U-shaped support 5, the front part of the seat rod 3 being rotatably connected to the front support leg 1, and the rear part of the seat rod 3 being rotatably connected to the support 5. An armrest 6 is rotatably connected to the backrest, and a sliding member capable of adjusting the position forward and backward is installed on the armrest 6, and the upper end of the front support leg 1 and the upper end of the rear support leg 2 are both connected to the sliding member. A reinforcing cross bar 7 is connected to the front support leg 1.

[0044] A rotatable backrest support rod 8 is installed on the backrest. The backrest support rod 8 is a U-shaped structure with the opening facing upward. The backrest includes a fixed backrest rod 9 and a movable backrest rod 10. The movable backrest rod 10 is a U-shaped structure with the opening facing downward. Two fixed backrest rods 9 are provided on the left and right. The lower part of the movable backrest rod 10 is movably connected to the upper parts of the two fixed backrest rods 9. The lower part of the movable backrest rod 10 slides up and down along the fixed backrest rod 9 to achieve adjustment of the entire backrest height.

[0045] The backrest is connected to a spring-loaded catch 11, which is a V-shaped structure. A spring-loaded post 12 is provided on the spring-loaded catch 11. Positioning holes 13 are provided on both the fixed backrest rod 9 and the movable backrest rod 10. The positioning hole 13 on the fixed backrest rod 9 is located near its upper portion. The spring-loaded post 12 is plugged into and connected to the two positioning holes 13 to achieve positioning of the fixed backrest rod 9 and the movable backrest rod 10. A push-button 14 is installed on the backrest support rod 8. After the backrest support rod 8 is flipped downward, the push-button 14 presses against the spring-loaded post 12 to push the spring-loaded post 12 to move. The backrest support rod 8 is connected to the movable backrest rod 10 of the backrest. The upper end of the backrest support rod 8 is fastened to an "L"-shaped support rod connector 15, which is rotatably mounted on the movable backrest rod 10.

[0046] Both the fixed backrest rod 9 and the movable backrest rod 10 are tubular structures, with the upper portion of the fixed backrest rod 9 being movably inserted into the movable backrest rod 10. A positioning sleeve 16 is mounted on the lower end of the movable backrest rod 10, and a limiting flange 17 with an inward protrusion 35 is provided on the positioning sleeve 16. The limiting flange 17 is located at the inner edge of the lower end of the positioning sleeve 16. A limiting piece 18 is connected to the outer wall of the fixed backrest rod 9. The limiting piece 18 is positioned between the movable backrest rod 10 and the fixed backrest rod 9, and the limiting flange 17 blocks the limiting piece 18. The limiting pieces 18 are arranged in two opposing pieces, each having an arc-shaped structure. A boss 19 is provided on the limiting piece 18, and a socket 20 is provided on the fixed backrest rod 9. The boss 19 is inserted and connected to the socket 20, and the limiting piece 18 fits snugly against the outer wall of the fixed backrest rod 9.

[0047] The positioning sleeve 16 is provided with a plurality of spring tongues 34. In this embodiment, two spring tongues 34 are evenly distributed around the circumference. Each spring tongue 34 is provided with a protrusion 35. A corresponding retaining hole 36 is provided on the movable backrest rod 10, and the protrusion 35 is snap-fitted into the retaining hole 36. An end plug 37 is mounted on the upper end of the fixed backrest rod 9. A cross-shaped groove is provided on the lower end surface of the end plug 37. The end of the end plug 37 protrudes outward to form a ridge, which engages the end of the fixed backrest rod 9. An outwardly protruding retaining post 38 is provided on the outer wall of the end plug 37. A stopper hole 39 is provided on the fixed backrest rod 9, corresponding to the retaining post 38. The retaining post 38 is snap-fitted into the stopper hole 39.

[0048] The backrest of the beach chair is composed of a fixed backrest rod 9 and a movable backrest rod 10, which are movably connected. The movable backrest rod 10 can be moved up and down to adjust its position, thereby adjusting the height of the entire backrest and improving riding comfort. When the beach chair is unfolded for use, the lower end of the backrest support rod 8 is rotated backward. When the backrest support rod 8 is unfolded, it supports the entire backrest and ensures the stability of the beach chair.

[0049] After the movable backrest rod 10 moves upward to the high position, the positioning holes 13 on the fixed backrest rod 9 and the movable backrest rod 10 are aligned, and the elastic columns 12 provided on the spring buckle 11 are inserted into the two positioning holes 13 to achieve the positioning of the fixed backrest rod 9 and the movable backrest rod 10. When the movable backrest rod 10 needs to be moved, the backrest support rod 8 is flipped downward so that the push buckle 14 hits the elastic column 12. The backrest support rod 8 and the backrest are held close to each other, thereby pressing the elastic column 12 inward to unlock it. After that, the movable backrest rod 10 can be slid, which is convenient to operate.

[0050] Example 3: A beach chair with adjustable backrest (see attached Figure 7 , Attachment Figure 8), comprising a seat body, on which a backrest is arranged, the seat body comprising a front support leg 1 and a rear support leg 2, both of which are U-shaped structures with an opening facing upwards, the upper end of the front support leg 1 and the upper end of the rear support leg 2 being hinged together, a seat rod 3 being connected between the front support leg 1 and the backrest, and the seat rod 3 being a U-shaped structure with an opening facing forwards. The lower end of the backrest rod is rotatably connected to a U-shaped limit rod 4, the lower end of the limit rod 4 being hinged to the rear support leg 2, and the upper end of the limit rod 4 being abutted against the rear support leg 2 to achieve limited support. The lower end of the backrest rod is hinged to a U-shaped support 5, the front part of the seat rod 3 being rotatably connected to the front support leg 1, and the rear part of the seat rod 3 being rotatably connected to the support 5. An armrest 6 is rotatably connected to the backrest, and a sliding member capable of adjusting the position forward and backward is installed on the armrest 6, and the upper end of the front support leg 1 and the upper end of the rear support leg 2 are both connected to the sliding member. A reinforcing cross bar 7 is connected to the front support leg 1.

[0051] A rotatable backrest support rod 8 is installed on the backrest. The backrest support rod 8 is a U-shaped structure with the opening facing upward. The backrest includes a fixed backrest rod 9 and a movable backrest rod 10. The movable backrest rod 10 is a U-shaped structure with the opening facing downward. Two fixed backrest rods 9 are provided on the left and right. The lower part of the movable backrest rod 10 is movably connected to the upper parts of the two fixed backrest rods 9. The lower part of the movable backrest rod 10 slides up and down along the fixed backrest rod 9 to achieve adjustment of the entire backrest height.

[0052] The backrest is connected to a spring-loaded catch 11, which is a V-shaped structure. A spring-loaded post 12 is provided on the spring-loaded catch 11. Positioning holes 13 are provided on both the fixed backrest rod 9 and the movable backrest rod 10. The positioning hole 13 on the fixed backrest rod 9 is located near its upper portion. The spring-loaded post 12 is plugged into and connected to the two positioning holes 13 to achieve positioning of the fixed backrest rod 9 and the movable backrest rod 10. A push-button 14 is installed on the backrest support rod 8. After the backrest support rod 8 is flipped downward, the push-button 14 presses against the spring-loaded post 12 to push the spring-loaded post 12 to move. The backrest support rod 8 is connected to the movable backrest rod 10 of the backrest. The upper end of the backrest support rod 8 is fastened to an "L"-shaped support rod connector 15, which is rotatably mounted on the movable backrest rod 10.

[0053] Both the fixed backrest rod 9 and the movable backrest rod 10 are tubular structures, with the lower portion of the movable backrest rod 10 inserted into the fixed backrest rod 9. A positioning sleeve 16 is mounted on the upper end of the fixed backrest rod 9. The positioning sleeve 16 is provided with a limiting flange 17 with an inward protrusion 35, which is located at the inner edge of the upper end of the positioning sleeve 16. A limiting plate 18 is connected to the outer wall of the movable backrest rod 10. The limiting plate 18 is positioned between the movable backrest rod 10 and the fixed backrest rod 9, and the limiting flange 17 blocks the limiting plate 18. The limiting plates 18 are arranged in two opposing arc-shaped pieces. Each of the limiting plates 18 is provided with a protrusion 19, which is inserted into a socket 20 on the movable backrest rod 10. The protrusion 19 is inserted into the socket 20, and the limiting plates 18 fit closely against the outer wall of the movable backrest rod 10. As the movable backrest rod 10 moves up and down, the limiting plates 18 move synchronously with the movable backrest rod 10.

[0054] An airbag 21 is mounted on the limiting plate 18 and connected to an inflation mechanism 23 via an inflation tube 22. The inflation mechanism 23 is mounted on the upper portion of the movable backrest rod 10. The inflation mechanism 23 inflates the airbag 21 so that the airbag 21 is tightly pressed against the inner wall of the fixed backrest rod 9, thereby locking the movable backrest rod 10 in position. A groove is provided on the outer wall of the limiting plate 18, and the airbag 21 is mounted in the groove. The inflation mechanism 23 includes an inflation cylinder 24, a piston 25, and a piston rod 26. A reversing sleeve 27 is installed in the inflation cylinder 24, and a pushing portion 28 is provided in the reversing sleeve 27. The pushing portion 28 is provided with an inclined pushing surface 29. A guide ring arranged for axial movement is installed in the reversing sleeve 27, and an inclined guide surface 30 is provided on the guide ring. The pushing surface 29 and the guide surface 30 together form a V-shaped structure. A reset spring is installed between the guide ring and the reversing sleeve 27. The piston 25 is adapted to be installed in the inflation cylinder 24. A positioning spring 31 is installed in the inflation cylinder 24. The positioning spring 31 abuts against the piston 25, and the piston 25 abuts against the end face of the reversing sleeve 27. The piston rod 26 is connected to the piston 25. A telescopic column 32 is mounted on the piston rod 26. A preloaded spring is installed between the telescopic column 32 and the piston rod 26. The end of the telescopic column 32 is provided with an inclined driving surface 33. When the piston rod 26 moves, the driving surface 33 aligns with the push surface 29, causing the telescopic column 32 to retract. The pressure within the inflator 24 increases, inflating the airbag 21 through the inflation tube 22. After the telescopic column 32 slides away from the push surface 29, it extends outward, with its sidewalls abutting against the side of the push portion 28 to achieve positioning. At this point, the airbag 21 is inflated, locking the movable backrest rod 10 and the fixed backrest rod 9 in place. To unlock the airbag, the piston rod 26 is further pressed inward, causing the end surface of the telescopic column 32 to slide onto the guide surface 30. This releases the piston rod 26. Under the action of the positioning spring 31, the telescopic column 32 drives the guide ring to move, thereby unlocking the piston rod 26. The airbag 21 is now deflated, facilitating movement of the movable backrest rod 10. By providing the airbag 21 and the inflation structure, the movable backrest rod 10 can be moved to any position for locking and positioning, which is flexible and convenient.

[0055] The positioning sleeve 16 is provided with a plurality of spring tongues 34. In this embodiment, two spring tongues 34 are evenly distributed around the circumference. Each spring tongue 34 is provided with a protrusion 35. A corresponding locking hole 36 is provided on the fixed backrest rod 9, and the protrusion 35 is snap-fitted into the locking hole 36. An end plug 37 is mounted on the lower end of the movable backrest rod 10. The upper end surface of the end plug 37 is provided with a cross-shaped groove. The end of the end plug 37 protrudes outward to form a ridge, which engages the end of the movable backrest rod 10. An outwardly protruding locking post 38 is provided on the outer wall of the end plug 37. A stopper hole 39 is provided on the movable backrest rod 10, corresponding to the locking post 38. The locking post 38 is snap-fitted into the stopper hole 39.

[0056] The backrest of the beach chair is composed of a fixed backrest rod 9 and a movable backrest rod 10, which are movably connected. The movable backrest rod 10 can be moved up and down to adjust its position, thereby adjusting the height of the entire backrest and improving riding comfort. When the beach chair is unfolded for use, the lower end of the backrest support rod 8 is rotated backward. When the backrest support rod 8 is unfolded, it supports the entire backrest and ensures the stability of the beach chair.

[0057] The above-described embodiments are only preferred solutions of the present invention and do not limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A beach chair with an adjustable backrest, comprising a seat body with a backrest arranged on the seat body, characterized in that: A rotatable backrest support rod is installed on the backrest. The backrest includes a fixed backrest rod and a movable backrest rod. The lower part of the movable backrest rod is movably connected to the upper part of the fixed backrest rod. The lower part of the movable backrest rod slides up and down along the fixed backrest rod to adjust the height of the entire backrest.

2. The beach chair with an adjustable backrest according to claim 1, wherein: The backrest is connected with a spring buckle, and a spring column is arranged on the spring buckle. Positioning holes are provided on the fixed backrest rod and the movable backrest rod. The spring column is plug-connected with the two positioning holes to realize the positioning of the fixed backrest rod and the movable backrest rod.

3. The beach chair with an adjustable backrest according to claim 2, wherein: A push buckle is installed on the backrest support rod. After the backrest support rod is turned downward, the push buckle is pressed on the elastic column to push the elastic column to move.

4. The beach chair with an adjustable backrest according to claim 1, wherein: The fixed backrest rod and the movable backrest rod are both tubular structures, and the lower part of the movable backrest rod is inserted into the fixed backrest rod.

5. The beach chair with an adjustable backrest according to claim 4, wherein: A positioning sleeve is installed on the upper end of the fixed backrest rod, and an inwardly protruding limiting flange is set on the positioning sleeve. A limiting piece is connected to the outer wall of the movable backrest rod. The limiting piece is placed between the movable backrest rod and the fixed backrest rod, and the limiting flange blocks the limiting piece.

6. The beach chair with an adjustable backrest according to claim 5, characterized in that: The limiting piece is in an arc-shaped structure. A convex column is arranged on the limiting piece. A socket is arranged on the movable backrest rod. The convex column and the socket are plug-connected. The limiting piece fits closely with the outer wall of the movable backrest rod.

7. The beach chair with an adjustable backrest according to claim 5, wherein: A plurality of spring tongues are arranged on the positioning sleeve, protrusions are arranged on the spring tongues, and clamping holes are arranged on the fixed backrest rod corresponding to the protrusions, and the protrusions are connected with the clamping holes by clamping.

8. The beach chair with an adjustable backrest according to claim 4, wherein: An end plug is installed at the lower end of the movable backrest rod, and a "cross" shaped groove is set on the upper end surface of the end plug. The end of the end plug protrudes outward to form a convex edge, and the convex edge is close to the end of the movable backrest rod.

9. The beach chair with an adjustable backrest according to any one of claims 1 to 8, characterized in that: The backrest support rod is connected to the movable backrest rod of the backrest, and the upper end of the backrest support rod is fastened to the "L"-shaped support rod connector, which is rotatably installed on the movable backrest rod.

10. The beach chair with an adjustable backrest according to claim 1, wherein: The fixed backrest rod and the movable backrest rod are both tubular structures, and the upper part of the fixed backrest rod is movably inserted into the movable backrest rod.

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