Armrest locking structure and folding chair

Abstract

The utility model relates to an armrest locking structure and a folding chair, the armrest locking structure is arranged on a support rod arranged in an armrest, and the armrest locking structure comprises a sliding block arranged on the support rod in a sliding manner; the locking piece is arranged on the sliding block; the locking piece comprises a locking block, a locking shell and an elastic piece, the locking shell is arranged on the sliding block, the locking block is arranged on the locking shell, a locking part is arranged at the upper end of the locking shell and located above the supporting rod, and the elastic piece is arranged between the upper side wall of the locking shell and the upper end of the sliding block. The locking block is used in cooperation with the lower side wall of the sliding block, so that the locking part moves downwards and abuts against the upper side wall of the supporting rod, and the sliding block moves upwards and abuts against the lower side wall of the supporting rod under the action of the elastic piece. The folding chair comprises a folding chair body and an armrest locking structure, and the sliding block is arranged on a supporting rod in the folding chair body in a sliding mode. The locking piece in the locking structure is matched with the sliding block, the upper side wall and the lower side wall of the supporting rod can be locked at the same time, and the locking effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of folding chair armrests, in particular to a locking structure for an armrest and a folding chair. Background Art

[0002] The existing folding chair has a bottom bracket, a backrest bracket and a leg bracket. Both the backrest bracket and the leg bracket are rotatably connected to the armrest of the folding chair. Thus, the angles of the backrest bracket and the leg bracket can be adjusted by adjusting the angle of the armrest. However, in order to fix and stably adjust the angle of the armrest, a locking structure is provided on the armrest. The locking structure is rotatably connected to the bottom bracket, and the inner support rod of the armrest is locked and unlocked through the locking structure to realize the adjustment of the armrest angle, and further realize the adjustment of the angles of the backrest bracket and the leg bracket.

[0003] However, the existing armrest locking structure is complex in structure, and usually can only lock one side wall of the inner support rod of the armrest, and the locking effect is not good. Therefore, a locking structure for an armrest is proposed to solve the above problems. Summary of the Utility Model

[0004] The utility model provides a locking structure for an armrest and a folding chair. The locking member and the sliding block cooperate to lock the upper and lower side walls of the support rod at the same time, and the locking effect is good.

[0005] To achieve the above object, the utility model adopts the following technical scheme:

[0006] A locking structure for an armrest is installed on a support rod arranged inside the armrest and includes:

[0007] A sliding block is slidably arranged on the above support rod;

[0008] A locking member is arranged on the above sliding block;

[0009] The above locking member includes a lock block, a lock shell and an elastic member. The above lock shell is arranged on the above sliding block, the above lock block is arranged on the above lock shell, a locking portion is arranged at the upper end of the above lock shell and is located above the above support rod, and the elastic member is arranged between the upper side wall of the above lock shell and the upper end of the above sliding block;

[0010] The above lock block is used in cooperation with the lower side wall of the above sliding block to make the above locking portion move downward and abut against the upper side wall of the above support rod, and the above sliding block moves upward and abuts against the lower side wall of the above support rod under the action of the above elastic member.

[0011] Preferably, an eccentric wheel is arranged at one end of the above lock block and is rotatably arranged on the above lock shell, and the other end is free;

[0012] The above-mentioned lock housing is sleeved on the outer periphery of the above-mentioned sliding block, and a notch communicating with the inner sliding hole is provided at the upper end of the above-mentioned sliding block, and the above-mentioned locking portion passes downward through the notch and abuts against the upper side wall of the above-mentioned sliding block;

[0013] The rotation axis of the above-mentioned lock block is located below the lower side wall of the above-mentioned sliding block, and the distance between the rotation axis of the above-mentioned lock block and the lower side wall of the above-mentioned sliding block is less than the maximum radius of the above-mentioned eccentric wheel.

[0014] Preferably, the above-mentioned elastic member includes two elastic pieces, one ends of the two above-mentioned elastic pieces are respectively connected to the outer side wall of the upper end of the above-mentioned lock housing, the lower ends are in contact with the upper side wall of the above-mentioned sliding block, and the included angle between the elastic piece and the outer side wall of the upper end of the above-mentioned lock housing is an acute angle.

[0015] Preferably, the above-mentioned locking portion includes a tooth, and a plurality of slots cooperating with the above-mentioned tooth are provided on the upper side wall of the above-mentioned support rod along its length direction.

[0016] Preferably, a plurality of anti-slip protrusions are provided on the above-mentioned lock block.

[0017] Preferably, the above-mentioned sliding block is provided with a sliding hole, and first installation grooves for installing the outer side walls of the above-mentioned lock housing are provided on both outer side walls of the above-mentioned sliding block;

[0018] Second installation grooves are provided on both outer side walls of the above-mentioned sliding block, and installation holes are provided at the bottom of the above-mentioned second installation grooves.

[0019] A folding chair includes a folding chair main body and the above-mentioned armrest locking structure, and the above-mentioned sliding block is slidably arranged on a support rod inside the above-mentioned folding chair main body.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0021] By operating the lock block, the lock block cooperates with the lower side wall of the sliding block, so that the lock housing moves downward, and finally the locking portion abuts against the upper side wall of the support rod to form a lock on the upper side wall of the support rod. At the same time, under the action of the lock block and the elastic member, the sliding block will rise, and finally the inner side wall of the sliding block will abut against the lower side wall of the support rod, increasing the friction force between the two to form a lock on the lower side wall of the support rod. Finally, the locking member and the sliding block cooperate. When locking, the upper and lower side walls of the support rod can be locked simultaneously, and the locking effect is better. Description of the Drawings

[0022] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 Assembly schematic diagram of the armrest, support rod, sliding block and locking member in the embodiment of the present utility model (in the locked state);

[0024] Figure 2 Assembly schematic diagram of the support rod, sliding block and locking member in the embodiment of the present utility model (in the locked state);

[0025] Figure 3 Assembly sectional view of the support rod, sliding block and locking member in the embodiment of the present utility model (in the locked state);

[0026] Figure 4 Assembly drawing of the sliding block and locking member in the embodiment of the present utility model (in the locked state);

[0027] Figure 5 Sectional view of the sliding block and locking member in the embodiment of the present utility model (in the locked state);

[0028] Figure 6 Schematic diagram of the sliding block in the embodiment of the present utility model;

[0029] Figure 7 Schematic diagram of the locking member in the embodiment of the present utility model;

[0030] Figure 8 Schematic diagram of the folding chair in the embodiment of the present utility model Figure One ;

[0031] Figure 9 Schematic diagram of the folding chair in the embodiment of the present utility model Figure Two 。

[0032] Explanation of reference numerals:

[0033] 1. Sliding block; 11. Notch; 12. First sliding hole; 13. First installation groove; 14. Second installation groove; 2. Locking member; 21. Lock block; 211. Protrusion; 22. Lock shell; 221. Side installation plate; 222. Upper installation plate; 23. Locking part; 24. Elastic piece; 25. Eccentric wheel; 3. Armrest; 4. Support rod; 41. Card slot; 5. Backrest bracket; 6. Leg bracket; 7. Bottom bracket. Detailed implementation manners

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present utility model belong to the scope of protection of the present utility model.

[0035] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0036] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0037] As Figures 1-7 shown, an embodiment of the present utility model provides an armrest locking structure, which is installed on a support rod 4 arranged inside the armrest 3, and specifically includes a sliding block 1 and a locking member 2; a first sliding hole 12 is arranged on the sliding block 1, and the sliding block 1 is sleeved on the support rod 4 through the first sliding hole 12 and can slide along the length direction of the support rod 4. The locking member 2 includes a locking block 21, a locking shell 22 and an elastic member. The locking shell 22 is arranged on the sliding block 1, the locking block 21 is arranged on the locking shell 22, a locking portion 23 is arranged at the upper end of the locking shell 22 and is located above the support rod 4, and the elastic member is arranged between the upper side wall of the locking shell 22 and the upper end portion of the sliding block 1; through the cooperation of the locking block 21 and the lower side wall of the sliding block 1, the locking block 21 abuts against the lower side wall of the sliding block 1, so that the whole locking block 21 moves downward, the locking portion 23 moves downward, and finally abuts tightly against the upper side wall of the support rod 4, and the elastic member has a pre-tightening force. At the same time, the locking block 21 makes the sliding block 1 move upward, and under the action of the elastic member, the locking block 21 abuts tightly against the lower side wall of the sliding block 1, and the inner side wall of the sliding block 1 abuts tightly against the lower side wall of the support rod 4, and at the same time locks the upper and lower side walls of the support rod 4, and the locking effect is better; correspondingly, when it is necessary to release the lock, only need to make the locking block 21 move in the reverse direction, the locking block 21 no longer abuts against the lower side wall of the sliding block 1, the inner side wall of the sliding block 1 no longer abuts tightly against the lower side wall of the support rod 4, and under the action of the elastic member, the locking portion 23 moves upward and no longer abuts tightly against the upper side wall of the support rod 4, and returns to the initial state.

[0038] Specifically, in order to achieve the locking of the support rod 4 by the locking member 2, in this embodiment, the lock housing 22 is sleeved on the outer periphery of the sliding block 1, so that the lock block 21 is located directly below the support rod 4. Correspondingly, a notch 11 communicating with the inner sliding hole is formed at the upper end of the sliding block 1. When the locking member 2 needs to lock the support rod 4, the locking portion 23 can enter the sliding hole through the notch 11 downward and abut against the upper side wall of the sliding block 1. One end of the lock block 21 is provided with an eccentric wheel 25 and is rotatably arranged on the lock housing 22, and the other end is free. The rotation axis of the lock block 21 is located below the lower side wall of the sliding block 1, and the distance between the rotation axis of the lock block 21 and the lower side wall of the sliding block 1 is less than the maximum radius of the eccentric wheel 25. Therefore, by rotating the free end of the lock block 21, the eccentric wheel 25 at the end of the lock block 21 also rotates. During the rotation process, the outer side wall of the eccentric wheel 25 will first contact the lower side wall of the sliding block 1. During the continuous rotation of the eccentric wheel 25, since the distance between the rotation axis of the lock block 21 and the lower side wall of the sliding block 1 is less than the maximum radius of the eccentric wheel 25, the sliding block 1 will be forced to move upward until the inner side wall of the sliding block 1 contacts the lower side wall of the support rod 4, and the sliding block 1 stops moving. At the same time, the lock housing 22 moves downward, and the locking portion 23 moves downward until the outer side wall at the maximum radius of the eccentric wheel 25 contacts the lower side wall of the sliding block 1, and the lock housing 22 stops moving downward. At this time, the locking portion 23 abuts against the upper side wall of the support rod 4, and at the same time, the elastic member between the upper end portion of the lock housing 22 and the upper side wall of the sliding block 1 has a pre-tightening force. The pre-tightening force of the elastic member will cause the lock housing 22 to have an upward movement tendency, so that the eccentric wheel 25 continuously abuts against the lower side wall of the sliding block 1, so that the sliding block 1 can continuously abut against the lower side wall of the support rod 4, and the locking of the upper and lower side walls of the support rod 4 is completed.

[0039] Specifically, the elastic member includes two elastic pieces 24. One end of each of the two elastic pieces 24 is respectively connected to the outer side wall of the upper end portion of the lock housing 22, and the lower end contacts the upper side wall of the sliding block 1. The elastic piece 24 has a certain elasticity. When the lock block 21 causes the lock housing 22 to move downward, the upper end portion of the lock housing 22 will move downward. At this time, the lower end of the elastic piece 24 abuts against the upper side wall of the sliding block 1. Also, because the included angle between the elastic piece 24 and the outer side wall of the upper end portion of the lock housing 22 is an acute angle, the elastic piece 24 will be bent to generate an elastic force, and the elastic force will exert an upward action on the lock housing 22, thereby causing the lock block 21 to abut against the lower side wall of the sliding block 1. In this embodiment, the elastic piece is a plastic piece, the plastic piece has a certain elasticity, and the two plastic pieces and the lock housing 22 are of an integrally formed structure and are all made of plastic.

[0040] Specifically, in this embodiment, the locking portion 23 includes a locking tooth. A plurality of slots 41 that cooperate with the locking teeth are provided along the length direction of the upper side wall of the support rod 4. When the lock housing 22 moves downward, the locking teeth are engaged into the slots 41, and the locking teeth are abutted against the inner wall of the slots 41 to form a locking structure, so that the sliding block 1 cannot slide relative to the support rod 4, and the support rod 4 cannot move forward and backward or adjust its angle. A plurality of slots 41 are provided on the upper side wall of the support rod 4 to form a structure similar to a rack, which has a lower cost compared to installing an additional rack on the upper side wall of the support rod 4.

[0041] Specifically, a plurality of anti-slip protrusions 211 are provided on the lock block 21, and the anti-slip protrusions 211 are used for anti-slip to increase the friction between the lock block 21 and the operator's finger.

[0042] Specifically, the sliding block 1 is provided with a first sliding hole 12. The lock housing 22 includes two side mounting plates 221 and an upper mounting plate 222, and the three form a U-shaped structure. The locking portion 23 is mounted on the lower side wall of the upper mounting plate 222. The eccentric wheel 25 is rotatably disposed between the two side mounting plates 221 and is located at the lower end. The eccentric wheel 25 and the lock housing 22 form a second sliding hole. Correspondingly, first mounting grooves 13 are provided on both outer side walls of the sliding block 1. The lock housing 22 is sleeved on the outer peripheral side of the sliding block 1, that is, the two side mounting plates 221 are respectively mounted in the first mounting grooves 13. The eccentric wheel 25 is located below the sliding block 1, and the notch 11 is located below the upper mounting plate 222. The upper end of the elastic piece 24 is mounted on the upper end of the side mounting plate 221, and the lower end abuts against the upper side wall of the lower sliding block 1. The support rod 4 passes through the first sliding hole 12 and the second sliding block 1 and is slidably connected to the sliding block 1 and the locking member 2.

[0043] Correspondingly, second mounting grooves 14 are provided on both outer side walls of the sliding block 1. The bottom of the second mounting groove 14 is provided with mounting holes. When the entire armrest 3 with the locking structure is installed on the folding chair, the end of the connecting rod of the bottom bracket 7 of the folding chair is rotatably installed in the mounting holes in the second mounting grooves 14, which reduces the connection thickness between the sliding block 1 and the connecting rod of the bottom bracket 7 at this connection to a certain extent.

[0044] In this embodiment, a folding chair is also specifically disclosed, as Figures 8-9As shown, it includes a folding chair body and an armrest locking structure. The folding chair body has armrests 3, and a support rod 4 is arranged inside the armrests 3. The armrests 3 and the support rod 4 move integrally. A sliding block 1 is slidably arranged on the support rod 4. Specifically, the folding chair body also has a backrest bracket 5, a leg bracket 6, and a bottom bracket 7. The backrest bracket 5 is rotatably connected to both the armrests 3 and the bottom bracket 7, and the leg bracket 6 is rotatably connected to both the armrests 3 and the bottom bracket 7. By adjusting the angle of the support rod 4, that is, making the support rod 4 slide relative to the sliding block 1 and the locking member 2, the backrest bracket 5 and the leg bracket 6 can be rotated, so as to realize the angle adjustment of the backrest bracket 5 and the leg bracket 6. After the adjustment, the support rod 4 is locked through the cooperation of the sliding block 1 and the locking member 2, so that the support rod 4 can no longer slide relative to the sliding member and the locking member 2, and the angle adjustment of the backrest bracket 5 and the leg bracket 6 can be fixed. When it is necessary to continue adjusting the angles of the backrest bracket 5 and the leg bracket 6, only the support rod 4 needs to be unlocked.

[0045] The above embodiments are only the preferred embodiments of the present invention, and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art on the basis of the present invention belong to the scope of protection required by the present invention.

Claims

1. An armrest locking structure is installed on a support rod arranged inside the armrest, and is characterized in that Comprising: A sliding block, slidably arranged on the support rod; A locking member, arranged on the sliding block; The locking member includes a locking block, a locking housing and an elastic member. The locking housing is arranged on the sliding block, the locking block is arranged on the locking housing, a locking portion is arranged at the upper end of the locking housing and is located above the support rod, and the elastic member is arranged between the upper side wall of the locking housing and the upper end portion of the sliding block; The locking block is used in cooperation with the lower side wall of the sliding block, so that the locking portion moves downward and abuts against the upper side wall of the support rod, and the sliding block moves upward and abuts against the lower side wall of the support rod under the action of the elastic member.

2. The armrest locking structure according to claim 1, wherein One end of the locking block is provided with an eccentric wheel and is rotatably arranged on the locking housing, and the other end is free; The locking housing is sleeved on the outer periphery of the sliding block, and a notch communicating with its inner sliding hole is formed at the upper end of the sliding block, and the locking portion passes downward through the notch and abuts against the upper side wall of the sliding block; The rotation axis of the locking block is located below the lower side wall of the sliding block, and the distance between the rotation axis of the locking block and the lower side wall of the sliding block is less than the maximum radius of the eccentric wheel.

3. The armrest locking structure according to claim 2, wherein The elastic member includes two elastic sheets. One ends of the two elastic sheets are respectively connected to the outer side wall of the upper end of the locking housing, and the lower ends are in contact with the upper side wall of the sliding block, and the included angle between the elastic sheet and the outer side wall of the upper end of the locking housing is an acute angle.

4. The armrest locking structure according to claim 1, wherein The locking portion includes teeth, and a plurality of grooves matching with the teeth are arranged along the length direction of the upper side wall of the support rod.

5. The armrest locking structure according to claim 1, wherein A plurality of anti-slip protrusions are arranged on the locking block.

6. The armrest locking structure according to claim 1, wherein, The sliding block is provided with a sliding hole, and first installation grooves for installing the outer side walls of the two locking housings are arranged on both outer side walls of the sliding block; Second installation grooves are arranged on both outer side walls of the sliding block, and installation holes are arranged at the bottom of the second installation grooves.

7. A folding chair, characterized in that, Comprising a folding chair main body and the armrest locking structure according to any one of claims 1-6, and the sliding block is slidably arranged on the support rod in the folding chair main body.

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