Office chair backrest turnover mechanism

Abstract

The utility model discloses a backrest turnover mechanism of an office chair, which is characterized in that a hinge mechanism is arranged between a handrail and a chair back, a connecting rod mechanism is arranged between a chair seat and the bottom of the chair back, and a quick-pull bolt is arranged on the connecting rod mechanism, so that when the chair back needs to be folded, the quick-pull bolt can be taken down, and the chair back can be conveniently folded. According to the office chair, the lower end of the chair back is disconnected from the chair seat, the chair back can be folded around the armrests, the packaging space is reduced, the office chair can be rapidly installed after goods are received, the telescopic rod controlled by the control mechanism is arranged at the lower end of the chair seat, and when the telescopic rod is opened, the chair back is in a high-elasticity mode; when the telescopic rod is closed, the chair back is in a normal elastic mode, the telescopic rod does not participate in buffering of the bottom of the chair back, the chair back can cope with people with light weight, self adjustment can be achieved according to actual conditions, and the backward turning range of the chair back can be adjusted by controlling the telescopic rod.

Description

Technical Field

[0001] The utility model relates to the technical field of the flipping and buffering of an office chair backrest, in particular to a flipping mechanism for an office chair backrest. Background Art

[0002] The volume of office chairs accounts for a relatively large proportion in the daily logistics transportation cost and warehousing cost. Although disassembling all the accessories for transportation can maximize the saving of the packaging volume of office chairs, consumers need to go through a complex installation process after receiving them, which is extremely inconvenient. In addition, most of the buffering of the existing office chair backrests is provided by a C-shaped steel plate at the bottom. For people with a heavier body weight, the elasticity will gradually weaken after sitting and leaning, and the durability is relatively low. In addition, the buffering mode of the current office chair backrest is relatively single, and it cannot be switched among multiple buffering modes, and cannot adapt to most people or different application scenarios of the same people. Content of the Utility Model

[0003] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide a flipping mechanism for an office chair backrest to solve the technical problems mentioned in the background art.

[0004] To solve the technical problems, the utility model is realized by adopting the following technical solutions:

[0005] A flipping mechanism for an office chair backrest includes a seat, a backrest, and armrests. Armrests are installed on both sides of the seat, and a backrest is installed on the back side. It also includes a hinge mechanism and a link mechanism. A hinge mechanism is installed between the armrests and the backrest so that the backrest can rotate around the armrests. One end of the link mechanism is hinged to the lower end of the seat, and the other end is hinged to the lower end of the backrest.

[0006] Specifically, the hinge mechanism includes a first hinge arm, a second hinge arm, and a hinge shaft. A first hinge arm extends from the side of the armrest facing the backrest, and a second hinge arm extends from the side of the backrest facing the armrest. The first hinge arm and the second hinge arm are hinged through the hinge shaft, and the second hinge arm is located inside the first hinge arm. The link mechanism includes a connecting rod, a third hinge arm, and a quick-release pin. A third hinge arm extends from the lower end of the backrest. One end of the connecting rod is hinged to the lower end of the seat, and the other end is hinged to the third hinge arm through the quick-release pin.

[0007] It also includes a telescopic buffer mechanism. The telescopic buffer mechanism includes a telescopic rod and a control mechanism. A telescopic rod is arranged at the lower end of the seat. The telescopic rod includes a telescopic outer rod and a telescopic inner rod. The telescopic outer rod is hinged to the connecting rod, and the telescopic inner rod is fixedly connected to the inner wall of the seat. The acting end of the control mechanism cooperates with the output end of the telescopic rod to control the telescopic buffer of the backrest by the telescopic rod.

[0008] Specifically, a chassis is further provided at the lower end of the seat. The chassis is provided with a limiting groove and a switch groove that are communicated with each other. The main body end of the telescopic rod is nested in the limiting groove. The control mechanism includes a wire control switch and a locking switch. The wire control switch is installed on one side of the seat and is connected to the locking switch through a cable. The locking switch includes a switch base and a flipper. The switch base is arranged in the switch groove, and the switch base is provided with a fixing hole. One end of the telescopic inner rod passes through the fixing hole and is fixedly connected to the fixing hole. The end of the telescopic inner rod has a trigger head. A flipper is rotatably arranged inside the switch base. The outer side of the flipper is connected to the end of the wire control switch. The acting end of the flipper can abut against the trigger head when being pulled by the wire control switch, so that the telescopic rod is in a state of bufferable expansion and contraction. Or when the flipper is not pulled by the wire control switch, the trigger head resets and the telescopic rod is in a state of non-bufferable expansion and contraction.

[0009] Specifically, a connecting piece is further provided between the telescopic outer rod and the connecting rod. A connecting piece is further provided between the telescopic outer rod and the connecting rod. One end of the connecting piece is hinged to the telescopic outer rod, and the other end is hinged to the telescopic outer rod through a quick-release pin to form a triangular structure.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0011] The office chair of the present utility model is provided with a hinge mechanism between the armrest and the backrest, so that the backrest can rotate around the armrest. A link mechanism is provided between the seat and the bottom of the backrest, and a quick-release pin is arranged on the link mechanism. When the backrest needs to be folded, the quick-release pin can be removed, so that the lower end of the backrest is disconnected from the seat, and the backrest can be folded around the armrest, thereby reducing the packaging space during the transportation and handling of the office chair. Coupled with the disassembly and separation of the seat and the chair legs, the office chair of the present utility model can be installed only in two steps after receiving the goods, which is very convenient. For the buffering of the backrest, the office chair of the present utility model is provided with a telescopic rod controlled by a control mechanism at the lower end of the seat. When the telescopic rod is opened, that is, when the backrest is in the high-elasticity mode, the telescopic rod can buffer the bottom of the backrest, and can cope with the sitting and leaning of people with a larger body weight. When the telescopic rod is closed, the backrest is in the normal elasticity mode, and the telescopic rod does not participate in the buffering of the bottom of the backrest, and can cope with the sitting and leaning of people with a lighter body weight. Of course, it can also be adjusted according to the actual situation, and the backward turning amplitude of the backrest can also be adjusted by controlling the telescopic rod. Description of the Drawings

[0012] Figure 1 : One of the three-dimensional angle schematic diagrams of the overall structure assembly drawing of the backrest flipping mechanism of the office chair;

[0013] Figure 2 : Two of the three-dimensional angle schematic diagrams of the overall structure assembly drawing of the backrest flipping mechanism of the office chair;

[0014] Figure 3 : The third three-dimensional angle schematic diagram of the overall structure assembly drawing of the backrest flipping mechanism of this office chair;

[0015] Figure 4 : The side view angle schematic diagram of the overall structure assembly drawing of the backrest flipping mechanism of this office chair;

[0016] Figure 5 : The front view angle schematic diagram of the overall structure assembly drawing of the backrest flipping mechanism of this office chair;

[0017] Figure 6 : Figure 5 The sectional view taken along the A-A section in;

[0018] Figure 7 : Figure 3 One of the exploded views of the hinge mechanism in;

[0019] Figure 8 : Figure 3 Two of the exploded views of the hinge mechanism in;

[0020] Figure 9 : Figure 4 The sectional view taken along the B-B section in;

[0021] Figure 10 : One of the exploded views of the link mechanism and the telescopic buffer mechanism;

[0022] Figure 11 : Two of the exploded views of the link mechanism and the telescopic buffer mechanism;

[0023] Figure 12 : The schematic diagram of the backrest folding in this office chair;

[0024] In the figure: seat 100, backrest 200, armrest 300, hinge mechanism 400, link mechanism 500, first hinge arm 41, second hinge arm 42, hinge shaft 43, connecting rod 51, third hinge arm 52, quick-release pin 53, telescopic buffer mechanism 600, telescopic rod 6, control mechanism 7, telescopic outer rod 61, telescopic inner rod 62, chassis 8, limit groove 81, switch groove 82, wire control switch 71, locking switch 72, switch base 721, fin 722, fixing hole 721a, trigger head 621, connecting piece 54. Specific embodiments

[0025] Next, in combination with the accompanying drawings and specific embodiments, the present invention will be further described. It should be noted that, on the premise of no conflict, the following described embodiments or technical features can be combined arbitrarily to form new embodiments.

[0026] Refer to Figures 1 to 12 :

[0027] The utility model patent discloses a flipping mechanism for an office chair backrest, which includes a chair seat 100, a chair back 200, and armrests 300. Armrests 300 are installed on both sides of the chair seat 100, and the chair back 200 is installed on the back side. It also includes a hinge mechanism 400 and a link mechanism 500. An hinge mechanism 400 is installed between the armrests 300 and the chair back 200 so that the chair back 200 can rotate around the armrests 300. One end of the link mechanism 500 is hinged to the lower end of the chair seat 100, and the other end is hinged to the lower end of the chair back 200. With such a setting, the hinge shaft 43 in the link mechanism 500 can be disassembled. After disassembly, the bottom of the chair back 200 is separated from the connection, and the chair back 200 can rotate around the armrests 300 as the axis and fold towards the chair seat 100. This can save the packaging volume of the office chair during transportation, save logistics and warehousing costs, and users can also save complex installation procedures after receiving it. They only need to install the rotating shaft on the link mechanism 500 with the bottom of the chair back 200, which is very convenient. The rotating shaft preferably uses a quick-release pin 53.

[0028] Specifically, the hinge mechanism 400 includes a first hinge arm 41, a second hinge arm 42, and a hinge shaft 43. The first hinge arm 41 extends from the side of the armrests 300 facing the chair back 200, and the second hinge arm 42 extends from the side of the chair back 200 facing the armrests 300. The first hinge arm 41 and the second hinge arm 42 are hinged through the hinge shaft 43, and the second hinge arm 42 is located inside the first hinge arm 41. Here, the second hinge arm 42 is preferably L-shaped and extends from a position below the middle of the chair back 200 towards the armrests 300. With such a setting, the chair back 200 can just fold between the two armrests 300 when folding, so as to complete the minimum space folding. Specifically, the link mechanism 500 includes a connecting rod 51, a third hinge arm 52, and a quick-release pin 53. The third hinge arm 52 extends from the lower end of the chair back 200. One end of the connecting rod 51 is hinged to the lower end of the chair seat 100, and the other end is hinged to the third hinge arm 52 through the quick-release pin 53.

[0029] Specifically, the buffering of the traditional backrest 200 when being leaned on by the back is supported by a C-shaped steel plate connecting the bottom of the backrest 200 and the seat 100. However, this steel plate has a limited number of uses, and this number will decrease as the weight of the user increases, thus affecting the durability of the overall seat. Moreover, the elastic force mode is the same for people of different weights. Here, a technical solution that can provide multiple elastic force modes for the backrest 200 is proposed, including a telescopic buffer mechanism 600. The telescopic buffer mechanism 600 includes a telescopic rod 6 and a control mechanism 7. The lower end of the seat 100 is provided with a telescopic rod 6. The telescopic rod 6 includes a telescopic outer rod 61 and a telescopic inner rod 62. Among them, the telescopic outer rod 61 is hinged to the connecting rod 51, and the telescopic inner rod 62 is fixedly connected to the inner wall of the seat 100. The acting end of the control mechanism 7 cooperates with the output end of the telescopic rod 6 (the end of the telescopic inner rod 62) to control the telescopic buffering of the telescopic rod 6 on the backrest 200. Here, the telescopic rod 6 is preferably a self-locking spring rod or a self-locking pneumatic rod or a self-locking hydraulic rod.

[0030] Specifically, in order to optimize the internal installation space of the seat 100, a chassis 8 is further provided at the lower end of the seat 100. The chassis 8 is provided with a limiting groove 81 and a switch groove 82 that communicate with each other. The main body end of the telescopic rod 6 is nested in the limiting groove 81. The control mechanism 7 includes a wire control switch 71 and a locking switch 72. The wire control switch 71 is installed on one side of the seat 100 and is connected to the locking switch 72 through a cable. The locking switch 72 includes a switch base 721 and a toggle 722. The switch base 721 is arranged in the switch groove 82, and a fixing hole 721a is provided on the switch base 721. One end of the telescopic inner rod 62 passes through the fixing hole 721a and is fixedly connected to the fixing hole 721a. The end of the telescopic inner rod 62 has a trigger head 621. A toggle 722 is rotatably arranged inside the switch base 721. The outer side of the toggle 722 is connected to the end of the wire control switch 71. The acting end of the toggle 722 can abut against the trigger head 621 when being pulled by the wire control switch 71, so that the telescopic rod 6 is in a state of bufferable telescoping. Or when the toggle 722 is not pulled by the wire control switch 71, the trigger head 621 resets the telescopic rod 6 to a non-bufferable telescoping state. Here, there are various solutions for the reset of the toggle 722. One is that the trigger head 621 has a reset elasticity (prior art). When the wire control switch 71 is released, the toggle 722 is elastically reset by the trigger head 621. The other is that the end of the wire control switch 71 has a spring (prior art). When the wire control switch 71 is released, the part where the end of the wire control switch 71 is fixed to the toggle 722 is reset by the spring rebound. The wire control switch 71 is locked and unlocked by manually moving it up and down. When locking, the toggle 722 presses the trigger head 621, and the telescopic rod 6 can be telescoped. When unlocking, the toggle 722 resets, the trigger head 621 resets, and the telescopic rod 6 is fixed in this state and cannot be telescoped. Therefore, the angle of the backrest 200 relative to the seat 100 can also be adjusted in this way to be used as a reclining chair.

[0031] Specifically, when the backrest 200 reclines backward, there is a hinged relationship between the connecting rod 51 at the bottom and the telescopic outer rod 61. For example, when the backrest 200 reclines backward, there are two rotational relationships between the backrest 200 and the telescopic outer rod 61, resulting in the telescopic outer rod 61 sinking downward. The solution to this problem is to provide a rolling part at the upper end of the limiting groove 81 and strengthen its rigidity. Another solution is that a connecting piece 54 is further provided between the telescopic outer rod 61 and the connecting rod 51. One end of the connecting piece 54 is hinged to the telescopic outer rod 61, and the other end is hinged to the telescopic outer rod 61 through a quick-release pin 53, thus forming a triangular structure. The user can choose to connect the connecting piece 54 according to their own needs.

[0032] The above embodiments are only the preferred embodiments of the present utility model, and the scope of protection of the present utility model cannot be limited thereby. Any non-substantial changes and substitutions made by those skilled in the art based on the present utility model fall within the scope of protection required by the present utility model.

Claims

1. An office chair backrest flipping mechanism, comprising a chair seat, a chair backrest, and armrests. The armrests are installed on both sides of the chair seat, and the chair backrest is installed on the back side. It is characterized in that: It further includes a hinge mechanism and a link mechanism. A hinge mechanism is installed between the armrest and the backrest so that the backrest can rotate around the armrest. One end of the link mechanism is hinged to the lower end of the seat, and the other end is hinged to the lower end of the backrest.

2. The reclining mechanism of an office chair according to claim 1, wherein: The hinge mechanism includes a first hinge arm, a second hinge arm and a hinge shaft. The first hinge arm extends from the side of the armrest facing the backrest, and the second hinge arm extends from the side of the backrest facing the armrest. The first hinge arm and the second hinge arm are hinged through the hinge shaft, and the second hinge arm is located inside the first hinge arm. The link mechanism includes a connecting rod, a third hinge arm and a quick-release pin. The third hinge arm extends from the lower end of the backrest. One end of the connecting rod is hinged to the lower end of the seat, and the other end is hinged to the third hinge arm through the quick-release pin.

3. The reclining mechanism of an office chair according to claim 1, wherein: It further includes a telescopic buffer mechanism. The telescopic buffer mechanism includes a telescopic rod and a control mechanism. The telescopic rod is arranged at the lower end of the seat. The telescopic rod includes a telescopic outer rod and a telescopic inner rod. The telescopic outer rod is hinged to the connecting rod, and the telescopic inner rod is fixedly connected to the inner wall of the seat. The acting end of the control mechanism cooperates with the output end of the telescopic rod to control the telescopic buffer of the backrest by the telescopic rod.

4. The reclining mechanism of an office chair according to claim 3, wherein: A chassis is further arranged at the lower end of the seat. The chassis is provided with a limiting groove and a switch groove that communicate with each other. The main body end of the telescopic rod is nested in the limiting groove. The control mechanism includes a wire control switch and a locking switch. The wire control switch is installed on one side of the seat and is connected to the locking switch through a cable. The locking switch includes a switch base and a flipper. The switch base is arranged in the switch groove, and a fixing hole is arranged on the switch base. One end of the telescopic inner rod passes through the fixing hole and is fixedly connected to the fixing hole. The end of the telescopic inner rod has a trigger head. A flipper is rotatably arranged inside the switch base. The outer side of the flipper is connected to the end of the wire control switch. The acting end of the flipper can abut against the trigger head when being pulled by the wire control switch, so that the telescopic rod is in a state of being able to buffer and stretch, or the trigger head resets the telescopic rod to a state of not being able to buffer and stretch when the flipper is not pulled by the wire control switch.

5. The reclining mechanism of an office chair according to claim 3, wherein: A connecting piece is further arranged between the telescopic outer rod and the connecting rod. A connecting piece is also arranged between the telescopic outer rod and the connecting rod. One end of the connecting piece is hinged to the telescopic outer rod, and the other end is hinged to the telescopic outer rod through a quick-release pin to form a triangular structure.

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