Quick storage structure of chair back

Abstract

The utility model discloses a kind of chair back quick storage structure, including backrest, first support hinged on the backrest, and second support hinged on the first support, further including rotating mechanism, the rotating mechanism includes first connecting piece installed on first support and second connecting piece installed on second support;Rotating part that is rotatably cooperated with second connecting piece is equipped on the first connecting piece, pin shaft is slidably arranged in the second support, corresponding lock slot is equipped on the rotating part;Second support is also equipped with elastic member, the elastic member drives the pin shaft into lock slot and realizes locking cooperation, the utility model can be quickly fixed in use position when chair back is unfolded, and can be quickly unlocked, significantly improve the efficiency of unfolding and storage.

Description

Technical Field

[0001] This utility model relates to the field of chair back technology, and in particular to a quick-folding structure for chair backs. Background Technology

[0002] The backrest storage structure is a mechanical structure installed between the backrest and the seat to enable the backrest to fold, unfold, and fix. It allows the backrest to be stably supported when in use and to be folded up when not in use, thereby saving space and making it convenient to carry or store.

[0003] When existing chair back structures need to be stored or folded, users often need to manually operate multiple parts and manually operate pins, bolts or buckles to lock them. The structure is complex and the operation is cumbersome, which can easily lead to problems such as jamming, loosening or failure to lock securely, affecting the user experience. Utility Model Content

[0004] The purpose of this invention is to provide a quick-folding structure for chair backs that can be quickly fixed in the use position when the chair back is unfolded and can be quickly unlocked, significantly improving the efficiency of unfolding and folding.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a quick-folding structure for a chair back, including a backrest, a first bracket hinged to the backrest, and a second bracket hinged to the first bracket, and further including a rotating mechanism, the rotating mechanism including a first connecting member mounted on the first bracket and a second connecting member mounted on the second bracket; the first connecting member is provided with a rotating part that rotatably engages with the second connecting member, a pin is slidably disposed in the second bracket, and the rotating part is provided with a corresponding locking groove; the second bracket is also provided with an elastic member, the elastic member driving the pin into the locking groove to achieve a locking engagement; the inner wall of the locking groove is provided with a first guide slope, and the pin is provided with a second guide slope that engages with it.

[0006] By adopting the above technical solution, the second bracket can be locked after the backrest is unfolded, allowing the chair back to unfold quickly. This improves convenience and structural stability, preventing the chair back from loosening due to force. When locking or unlocking, the guide slope can guide the pin to slide smoothly into or out of the locking groove, reducing operating resistance and achieving smooth storage and unfolding actions, thus improving the user experience.

[0007] The present invention is further configured as follows: the first support includes two parallel and spaced first support rods, one end of the first support rod is bent upward and connected by a first crossbar, the end of the first support rod away from the first crossbar is rotatably disposed on the backrest, and the first connector is installed on the first support rod; the second support includes two parallel and spaced second support rods, one end of the second support rod is connected by a second crossbar, the second crossbar is provided with a support foot, and the end of the second support rod away from the second crossbar passes through the second connector.

[0008] By adopting the above technical solution, the first bracket, the second bracket and the backrest form a stable support frame structure, which makes the force on the backrest more even when it is unfolded, and the support feet can provide stable support, thereby improving the load-bearing performance and structural strength of the entire backrest during use.

[0009] The present invention is further configured such that: a bushing is provided inside the second support rod, the pin is slidably disposed inside the bushing, one end of the elastic element abuts against the pin, and the other end of the elastic element abuts against the inner wall of the bushing.

[0010] By adopting the above technical solution, the elastic element ensures that the pin can automatically reset after being compressed, thus improving the reliability of the locking structure.

[0011] The present invention is further configured such that: a limiting groove is provided on the pin, a boss is provided on the first connecting member, and a limiting shaft passes through the second support rod, wherein the limiting shaft is fixed to the boss and slides in cooperation with the limiting groove.

[0012] By adopting the above technical solution, the limiting structure can effectively control the sliding path of the pin, prevent the pin from moving excessively and causing it to come out, and ensure that the locking and unlocking process is smooth and reliable, thereby further improving safety.

[0013] The present invention is further configured such that: the bushing is provided with a limiting edge, and the limiting edge abuts against the end of the second support rod.

[0014] By adopting the above technical solution, the limiting edge forms a stop in the structure, preventing the bushing from coming off during use and further ensuring structural stability.

[0015] The present invention is further configured such that: a torsion spring is sleeved on the protrusion, one end of the torsion spring is fixed to the first connecting member, and the other end of the torsion spring abuts against the second connecting member.

[0016] By adopting the above technical solution, the torsion spring provides a restoring force to the rotating part, enabling the second bracket to automatically return to its original position after unlocking, simplifying the operation process, preventing structural jamming, and enhancing the smoothness and reliability of the chair back when it is folded up.

[0017] The present invention is further configured such that: the backrest includes two parallel and spaced third support rods, one end of the third support rod is connected by a third crossbar, and the end of the third support rod away from the third crossbar is connected by a fixed foot; a fixing plate is also provided between adjacent third support rods.

[0018] By adopting the above technical solution, the third support rod, the third crossbar, the fixed foot, and the fixed plate together form a solid load-bearing frame, enhancing the stability of the entire chair back structure.

[0019] The present invention is further configured such that: a cable is provided on the second crossbar, and a locking block is provided on the fixing plate, and the cable passes through the support foot and the locking block in sequence.

[0020] By adopting the above technical solution, the backrest and the second support can be controlled through the cable connection, making the backrest retraction and extension more convenient. Users only need to pull the cable to complete the release action, improving operational efficiency.

[0021] The present invention is further configured such that: a locking switch is slidably disposed inside the locking block, the locking switch is provided with a locking hole, the cable passes through the locking hole, multiple protruding ribs are provided inside the locking hole, and a locking spring is also provided inside the locking block, the locking spring drives the locking switch away from the locking block, so that the cable is clamped between the protruding ribs and the locking block.

[0022] By adopting the above technical solution, after the locking switch is released, the locking spring drives the locking switch to firmly press the rib onto the cable, ensuring that the cable will not retract, preventing the chair back from folding down on its own, improving operational convenience, and further enhancing structural stability.

[0023] In summary, this utility model has the following beneficial effects: 1. When the chair back is unfolded, the pin in the second bracket can automatically enter the locking groove and lock under the action of the elastic element, so that the chair back can be quickly fixed in the use position without manual locking, which significantly improves the efficiency of unfolding and storage.

[0024] 2. By sliding the limit shaft and the limit groove, the movement range of the pin can be effectively limited, preventing the pin from falling off or shifting during frequent operation, and ensuring stable and smooth locking action.

[0025] 3. With the cable and locking block structure, users only need to pull the cable lightly to unlock. Combined with the self-locking effect of the locking spring and the rib, it can prevent the cable from rebounding and causing misoperation. It is simple to operate and safe and reliable. Attached Figure Description

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

[0027] Figure 2 This is a side view of the utility model in its stored state.

[0028] Figure 3 This is an exploded view of the rotating mechanism of this utility model.

[0029] Figure 4 This is a cross-sectional view of the second support and rotating mechanism of this utility model.

[0030] Figure 5 This is an exploded view of the locking block of this utility model.

[0031] In the diagram: 1. Backrest; 11. Third support rod; 12. Third crossbar; 13. Fixed foot; 14. Fixed plate; 15. Cable; 2. First bracket; 21. First support rod; 22. First crossbar; 3. Second bracket; 31. Second support rod; 32. Second crossbar; 33. Support foot; 34. Bushing; 341. Limiting edge; 4. Rotating mechanism; 41. First connecting piece; 411. Rotating part; 412. Locking groove; 413. Boss; 414. First guide slope; 42. Second connecting piece; 43. Pin; 431. Limiting groove; 432. Limiting shaft; 433. Second guide slope; 44. Elastic element; 45. Torsion spring; 6. Locking block; 61. Locking switch; 62. Locking hole; 63. Rib; 64. Locking spring. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings.

[0033] like Figures 1 to 4 As shown, this utility model provides a quick-folding chair back structure, including a backrest 1, a first bracket 2 hinged to the backrest 1, and a second bracket 3 hinged to the first bracket 2. It also includes a rotating mechanism 4, which comprises a first connecting member 41 mounted on the first bracket 2 and a second connecting member 42 mounted on the second bracket 3. The first connecting member 41 has a rotating part 411 that rotatably engages with the second connecting member 42. A pin 43 is slidably disposed inside the second bracket 3. The rotating part 411 has a locking groove 412 that engages with the pin 43. An elastic member 44 is also provided inside the second bracket 3 to drive the pin 43 into the locking groove 412, thereby achieving a locking engagement. With this structure, when the chair back is in the unfolded state, the pin 43 automatically enters the locking groove 412, achieving quick locking and providing stable support for the chair back. When folding is required, simply rotating the second bracket 3 releases the lock, allowing the backrest 1 to fold quickly, making operation convenient.

[0034] like Figures 1 to 4As shown, the first support 2 includes two parallel and spaced first support rods 21. One end of the first support rod 21 is bent upward and connected to the other end by a first crossbar 22 to form a frame structure. The ends of the two first support rods 21 away from the first crossbar 22 are respectively hinged to the backrest 1 to form a rotatable connection. The first connector 41 is installed in the middle section of the first support rod 21. The second support 3 includes two parallel and spaced second support rods 31. One end of the second support rod 31 is connected to the other end by a second crossbar 32 to form a frame structure. The second crossbar 32 is provided with a support foot 33 for providing support when the chair back is unfolded and in contact with the ground. The end of the second support rod 31 away from the second crossbar 32 passes through the second connector 42 and forms a cooperating structure with the rotating part 411 of the first support 2. Through the linkage of the first support 2, the second support 3 and the backrest 1, a complete support frame is formed, so that the entire chair back is subjected to uniform force after unfolding, improving structural stability and load-bearing capacity.

[0035] like Figure 3 and Figure 4 As shown, the second support rod 31 has a bushing 34 inside, and the pin 43 is slidably disposed in the bushing 34. The elastic element 44 is disposed between the pin 43 and the inner wall of the bushing 34, with one end abutting the pin 43 and the other end abutting the inner wall of the bushing 34. The elastic element 44 is a spring. When the rotating part 411 pushes the pin 43 out of the locking groove 412, the elastic element 44 is compressed. When the external force is released, the elastic element 44 returns to its original state and pushes the pin 43 back into the locking groove 412, thereby achieving automatic locking.

[0036] like Figure 3 and Figure 4 As shown, to prevent the pin 43 from dislodging during sliding, a limiting groove 431 is provided on the pin 43, a boss 413 is provided on the first connecting member 41, and a limiting shaft 432 passes through the second support rod 31. The limiting shaft 432 is fixedly connected to the boss 413 and forms a sliding fit with the limiting groove 431. Through this structure, the sliding range of the pin 43 is controlled, avoiding structural damage caused by the pin 43. A limiting edge 341 is provided at the end of the bushing 34, which abuts against the end of the second support rod 31 to prevent the bushing 34 from dislodging under external force.

[0037] like Figure 3 and Figure 4 As shown, a first guide slope 414 is provided on the inner wall of the lock groove 412, and a corresponding second guide slope 433 is provided at the front end of the pin 43. The two work together to guide the pin 43 when unlocking or locking, so that the pin 43 can smoothly enter or exit the lock groove 412, reduce jamming and friction, and improve the smoothness of operation.

[0038] In addition, a torsion spring 45 is sleeved on the outside of the boss 413 of the first connector 41. One end of the torsion spring 45 is fixed to the first connector 41, and the other end abuts against the second connector 42. The torsion spring 45 provides a restoring force during the unfolding or folding of the chair back, so that the second bracket 3 can automatically rotate back to the initial position after unlocking, thereby achieving quick reset and improving storage efficiency.

[0039] like Figure 1 and Figure 5 As shown, the backrest 1 includes two parallel and spaced third support rods 11. One end of the third support rod 11 is connected by a third crossbar 12 to form the frame structure of the backrest 1. The end of the third support rod 11 away from the third crossbar 12 is connected and supported by a fixed foot 13 to ensure the overall stability of the backrest 1. A fixed plate 14 is provided between the two third support rods 11 to enhance the structural rigidity. To facilitate user operation and locking control, a pull cable 15 is provided on the second crossbar 32, and a locking block 6 is provided on the fixed plate 14. The pull cable 15 passes through the support foot 33 and the locking block 6 in sequence. Through the pull cable 15 structure, the user can directly pull the pull cable 15 to control the second support 32. Unlocking allows the chair back to fold up quickly, with intuitive and effortless operation. A locking switch 61 is slidably installed inside the locking block 6. The locking switch 61 has a locking hole 62, through which the pull cable 15 passes. Multiple ribs 63 are provided on the inner wall of the locking hole 62 to clamp the pull cable 15 in the locked state. A locking spring 64 is also provided inside the locking block 6. One end of the locking spring 64 abuts against the locking switch 61, and the other end abuts against the inner wall of the locking block 6. The spring causes the locking switch 61 to automatically reset, pressing the ribs 63 against the pull cable 15. When the user releases the operating force, the pull cable 15 will be locked by the ribs 63 to prevent it from retracting and to prevent the chair back from folding or loosening on its own during use.

[0040] The basic working principle of this utility model is as follows: When the user needs to use the chair back, the first support 2 is first folded down from its folded state, and the second support 3 is unfolded outward. The second connecting piece 42 installed on the second support 3 then rotates around the rotating part 411 on the first connecting piece 41. During the rotation, the pin 43 inside the second support 3 rotates against the rotating part 411 under the action of the elastic member 44. When the second guide slope 433 at the front end of the pin 43 contacts the first guide slope 414 of the locking groove 412, the pin 43 is guided to automatically slide into the locking groove 412. Due to the continuous pushing force applied by the elastic member 44, the pin 43 fully enters the locking groove 412 and forms a stable locking fit, preventing the second support 3 from continuing to rotate. The movement of the first support 2, the second support 3 and the backrest 1 together form a stable support structure. At the same time, the locking spring 64 in the locking block 6 pushes the locking switch 61, so that the rib 63 on the locking switch 61 presses the pull cable 15 to prevent the pull cable 15 from rebounding. When the user needs to fold up the backrest, the user can unlock it by pulling the pull cable 15 set on the second crossbar 32. When the user pulls the pull cable 15, it drives the pin 43 to slide backward along the bushing 34, so that it exits the locking groove 412, thereby releasing the locking state. At this time, under the action of the rebound force of the torsion spring 45, the second support 3 automatically retracts around the rotating part 411 towards the backrest 1, completing the folding action of the backrest.

[0041] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A quick-folding structure for a chair back, comprising a backrest (1), a first bracket (2) hinged to the backrest (1), and a second bracket (3) hinged to the first bracket (2), characterized in that: It also includes a rotating mechanism (4), which includes a first connector (41) mounted on the first bracket (2) and a second connector (42) mounted on the second bracket (3); The first connector (41) is provided with a rotating part (411) that rotatably engages with the second connector (42), and a pin (43) is slidably disposed inside the second bracket (3). The rotating part (411) is provided with a corresponding locking groove (412). The second bracket (3) is also provided with an elastic element (44), which drives the pin (43) into the locking groove (412) to achieve locking engagement; The inner wall of the locking groove (412) is provided with a first guide slope (414), and the pin (43) is provided with a second guide slope (433) that cooperates with it.

2. The quick-folding structure for a chair back as described in claim 1, characterized in that: The first support (2) includes two parallel and spaced first support rods (21), one end of the first support rod (21) is bent upward and connected by a first crossbar (22), the end of the first support rod (21) away from the first crossbar (22) is rotatably disposed on the backrest (1), and the first connector (41) is installed on the first support rod (21). The second bracket (3) includes two parallel and spaced second support rods (31). One end of the second support rod (31) is connected by a second crossbar (32). The second crossbar (32) is provided with a support foot (33). The end of the second support rod (31) away from the second crossbar (32) passes through the second connector (42).

3. The quick-folding structure for a chair back as described in claim 2, characterized in that: The second support rod (31) is provided with a bushing (34), the pin (43) is slidably disposed in the bushing (34), one end of the elastic element (44) abuts against the pin (43), and the other end of the elastic element (44) abuts against the inner wall of the bushing (34).

4. The quick-folding structure for a chair back as described in claim 2, characterized in that: The pin (43) is provided with a limiting groove (431), the first connector (41) is provided with a boss (413), and the second support rod (31) is provided with a limiting shaft (432). The limiting shaft (432) is fixed to the boss (413) and slides in cooperation with the limiting groove (431).

5. The quick-folding structure for a chair back as described in claim 3, characterized in that: The bushing (34) is provided with a limiting edge (341), which abuts against the end of the second support rod (31).

6. The quick-folding structure for a chair back as described in claim 4, characterized in that: A torsion spring (45) is fitted on the boss (413). One end of the torsion spring (45) is fixed to the first connector (41), and the other end of the torsion spring (45) abuts against the second connector (42).

7. The quick-folding structure for a chair back as described in claim 2, characterized in that: The backrest (1) includes two parallel and spaced third support rods (11), one end of the third support rod (11) is connected by a third crossbar (12), and the end of the third support rod (11) away from the third crossbar (12) is connected by a fixed foot (13). A fixing plate (14) is also provided between adjacent third support rods (11).

8. The quick-folding structure for a chair back as described in claim 7, characterized in that: The second crossbar (32) is provided with a cable (15), and the fixing plate (14) is provided with a locking block (6). The cable (15) passes through the support foot (33) and the locking block (6) in sequence.

9. A quick-folding structure for a chair back as described in claim 8, characterized in that: A locking switch (61) is slidably disposed inside the locking block (6). The locking switch (61) is provided with a locking hole (62). The cable (15) passes through the locking hole (62). Multiple ribs (63) are provided inside the locking hole (62). A locking spring (64) is also provided inside the locking block (6). The locking spring (64) drives the locking switch (61) away from the locking block (6), so that the cable (15) is clamped between the ribs (63) and the locking block (6).

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