Office chair cushion and chair back linkage mechanism

Abstract

The utility model discloses a cushion and chair back linkage mechanism of an office chair, which comprises a chair seat, armrests and a chair back, and is provided with a slidable cushion, the chair back capable of rotating around the armrests and a telescopic buffer mechanism capable of controlling the cushion and the chair back to stretch out and draw back through a control mechanism. The telescopic buffer mechanism is linked with the sliding mechanism, so that the angle adjustment of the chair back and the front-back sliding of the cushion are linked, when the cushion moves forwards, the chair back is folded backwards and the cushion is reset, the chair back is also reset along with the cushion, the gravity center of a human body moves forwards, and at the moment, the human body can be prevented from falling down by matching with large-angle backward lying; and after the gravity center of the human body moves forwards and the cushion moves forwards, most of the human body is hidden below the office table, and the rest of the chair back is turned backwards, so that the occupation of the aisle space can be saved to the greatest extent, and the cushion and the chair back of the office chair can be suspended at any angle and any position by controlling the telescopic buffer mechanism through the wire control switch.

Description

Technical Field

[0001] The utility model relates to the technical field of office chairs, in particular to a linkage mechanism between a seat cushion and a chair back of an office chair. Background Art

[0002] In the daily use of office chairs, lunch break is a part that is used more frequently. During lunch break, users usually lay down the chair back, that is, turn it outward, to obtain a more comfortable reclining sleeping position. However, the office chairs on the market are relatively conservative in controlling the outward turning angle, because excessive outward turning angle can easily cause the user's center of gravity to shift backward, causing falling backwards. Moreover, excessive backward turning angle will also occupy aisle space, making the already narrow office space even smaller. Therefore, it is particularly important to prevent falling while expanding the reclining sleeping angle or not occupying too much aisle space when laying down. Utility Model Content

[0003] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide a seat cushion and chair back linkage mechanism for an office chair to solve the technical problems mentioned in the background technology.

[0004] In order to solve the technical problem, the utility model adopts the following technical solution:

[0005] A linkage mechanism between a seat cushion and a backrest of an office chair comprises a seat, an armrest and a seat back, wherein the seat comprises a chassis and a seat cushion, the armrest is fixedly connected to the chassis, a sliding mechanism and a telescopic buffer mechanism are provided between the seat cushion and the chassis, the upper end of the sliding mechanism is fixedly connected to the seat cushion, and the lower end is fixedly connected to the chassis to enable the seat cushion to slide relative to the chassis, one end of the telescopic buffer mechanism is connected to the seat back via a connecting rod mechanism, and the other end is connected to the chassis, the sliding mechanism and the telescopic buffer mechanism are linked via a linkage piece, and a hinge mechanism is further provided between the seat back and the armrest, and the seat back is able to rotate, fold or turn outward around the armrest through the hinge mechanism.

[0006] Specifically, the sliding mechanism includes a sliding plate, a positioning seat and a pressure plate, one side of the sliding plate is fixedly connected to the seat cushion, the upper end of the chassis is fixedly connected to the positioning seat, a slide groove is provided on the sliding plate, the sliding plate is sleeved on the positioning seat through the slide groove, and the pressure plate is fixedly connected to the positioning seat from the top of the slide groove downward, the telescopic buffer mechanism includes a telescopic rod and a control mechanism for controlling the telescopic rod, one end of the telescopic rod is fixedly connected to the chassis, and the other end extends to one side of the chair back, the connecting rod mechanism includes a connecting rod and a first articulated arm, the lower end of the chair back is provided with a first articulated arm, one end of the connecting rod is hinged to the first articulated arm, and the other end of the connecting rod is hinged to a linkage, and the linkage has a first connecting part and a second connecting part, wherein the first connecting part is fixedly connected to the sliding plate, and the second connecting part is hinged to the other end of the telescopic rod.

[0007] Specifically, the hinge mechanism includes a second hinge arm, a third hinge arm, and a hinge shaft. A second hinge arm extends from the side of the armrest facing the backrest, and a third hinge arm extends from the side of the backrest facing the armrest. The second hinge arm and the third hinge arm are hinged by the hinge shaft, and the third hinge arm is located inside the second hinge arm.

[0008] Specifically, a clamping groove is provided at the upper end of the chassis, and the telescopic rod is clamped in the clamping groove. The telescopic rod includes a telescopic outer rod and a telescopic inner rod. The output end of the telescopic inner rod is fixedly connected to the chassis and its telescoping is controlled by a control mechanism. The end of the telescopic outer rod is hinged to the second connecting portion of the linkage member.

[0009] Specifically, 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 rocker. A fixing hole is provided 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 rocker is rotatably provided inside the switch base. The outer side of the rocker is connected to the end of the wire control switch. The acting end of the rocker can be pressed against the trigger head when being pulled by the wire control switch, so that the telescopic rod is in a state of buffer telescoping, or the trigger head resets the telescopic rod to a non-buffer telescoping state when the rocker is not pulled by the wire control switch.

[0010] Specifically, the sliding plate includes a fixed end and a sunken end. The fixed ends are located on both sides of the sunken end and the height of the fixed ends is higher than that of the sunken end. The fixed ends are fixedly connected to the seat cushion, and the sliding groove is located on the sunken end.

[0011] Specifically, a limiting piece is further provided on the sliding plate. The limiting piece is provided with an inner groove and an outer groove. The inner groove is longitudinally communicated with the sliding groove and is arranged identically. The outer groove is just for the pressing plate to be nested. The upper end surface of the positioning seat is just flush with the groove surface of the outer groove. The length of the sliding groove is greater than the length of the positioning seat.

[0012] Specifically, a roller assembly is further provided at the upper end of the chassis and the lower end of the sliding plate. The roller assembly is composed of a plurality of rollers that can assist the sliding of the sliding plate.

[0013] Specifically, a third connecting portion further extends from one side of the second connecting portion, and the telescopic outer rod is hinged to the third connecting portion.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] The present invention provides a sliding seat cushion and a chair back that can rotate around an armrest, and a telescopic buffer mechanism that can be controlled to extend or not by a control mechanism. The telescopic buffer mechanism is linked with the sliding mechanism, so that the chair back angle adjustment is linked with the forward and backward sliding of the seat cushion. When the seat cushion moves forward, the chair back folds backward, and when the seat cushion is reset, the chair back is also reset. The advantage of the seat cushion moving forward is that the center of gravity of the human body moves forward, and lying back at a large angle can prevent falling. When the center of gravity of the human body moves forward and the seat cushion moves forward, most of the human body is hidden under the desk, and the remaining chair back part is flipped backward, which can save the occupation of the aisle space to the greatest extent. The telescopic buffer mechanism is controlled by a wired switch, so that the seat cushion and the chair back of the present office chair can hover at any angle and any position. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 :This is one of the overall structural decomposition diagrams of this office chair

[0017] Figure 2 :It is a three-dimensional diagram of the overall structure assembly state of this office chair;

[0018] Figure 3 : This is the front view of the overall structure of the office chair in assembly state;

[0019] Figure 4 :for Figure 2 The cross-sectional view in the middle AA direction;

[0020] Figure 5 : This is the second diagram of the overall structure of the office chair;

[0021] Figure 6 :It is the exploded view of sliding mechanism and connecting rod mechanism;

[0022] Figure 7 :It is the exploded view of the connecting rod mechanism and telescopic buffer mechanism;

[0023] Figure 8 : It is the exploded diagram of the telescopic buffer structure;

[0024] Figure 9 : It is a top view of the overall structure assembly state of the office chair;

[0025] Figure 10 :for Figure 9 The cross-sectional view in the middle BB direction;

[0026] Figure 11 : This is the effect diagram of switching between two states of this office chair;

[0027] In the figure: seat 100, armrest 200, backrest 300, chassis 1, seat cushion 2, sliding mechanism 3, telescopic buffer mechanism 400, linkage member 5, hinge mechanism 6, sliding plate 31, positioning seat 32, pressing plate 33, sliding groove 311, telescopic rod 4, control mechanism 8, link mechanism 7, link 71, first hinge arm 72, first connecting portion 51, second connecting portion 52, second hinge arm 61, third hinge arm 62, hinge shaft 63, clamping groove 11, telescopic outer rod 41, telescopic inner rod 42, wire control switch 81, locking switch 82, switch base 821, fin 822, fixing hole 821a, trigger head 421, fixed end 312, sinking end 313, limiting piece 34, inner groove 341, outer groove 342, roller assembly 9, third connecting portion 54. Detailed implementation mode

[0028] Next, in combination with the accompanying drawings and the detailed implementation mode, the present utility model will be further described. It should be noted that, on the premise of no conflict, any combination can be formed among the following-described embodiments or technical features to form a new embodiment.

[0029] Refer to Figures 1 to 11 :

[0030] The present utility model discloses a linkage mechanism between a seat cushion 2 and a backrest 300 of an office chair, including a seat 100, armrests 200, and a backrest 300. The armrests 200 are installed on both sides of the seat 100, and the backrest 300 is installed on the back of the armrests 200. The seat 100 includes a chassis 1 and a seat cushion 2 (here, the seat cushion 2 is a general term, and a frame and a cushion body are also provided inside the seat cushion 2, or a cloth cover is wrapped by the frame). The armrests 200 are fixedly connected to the chassis 1. A sliding mechanism 3 and a telescopic buffer mechanism 400 are provided between the seat cushion 2 and the chassis 1. The upper end of the sliding mechanism 3 is fixedly connected to the seat cushion 2, and the lower end of the sliding mechanism 3 is fixedly connected to the chassis 1 to enable the seat cushion 2 to relatively slide with respect to the chassis 1. One end of the telescopic buffer mechanism 400 is connected to the backrest 300 through a link 71 mechanism 7, and the other end of the telescopic buffer mechanism 400 is connected to the chassis 1. The sliding mechanism 3 and the telescopic buffer mechanism 400 are linked through a linkage member 5. A hinge mechanism 6 is further provided between the backrest 300 and the armrests 200, and the backrest 300 can rotate and fold or turn outwards around the armrests 200 through the hinge mechanism 6.

[0031] Specifically, the sliding mechanism 3 includes a sliding plate 31, a positioning seat 32, and a pressing plate 33. One side of the sliding plate 31 is fixedly connected to the seat cushion 2. The positioning seat 32 is fixedly connected to the upper end of the chassis 1. The sliding plate 31 is provided with a sliding groove 311, and the sliding plate 31 is sleeved on the positioning seat 32 through the sliding groove 311. The pressing plate 33 is fixedly connected to the positioning seat 32 downward from above the sliding groove 311. Here, the positioning seat 32 is a flange with the characteristics of a long and narrow component, but its length is less than the length of the sliding groove 311. In this way, the sliding plate 31 can make a sliding movement relative to the positioning seat 32. And because the seat cushion 2 is fixedly connected to the sliding plate 31, it is equivalent to the seat cushion 2 can make a sliding movement relative to the positioning seat 32;

[0032] The telescopic buffer mechanism 400 includes a telescopic rod 4 and a control mechanism 8 for controlling the telescopic movement of the telescopic rod 4. One end of the telescopic rod 4 is fixedly connected to the chassis 1, and the other end extends to one side of the backrest 300 or extends out of a notch of the chassis 1. The link 71 mechanism 7 includes a link 71 and a first articulated arm 72. The lower end of the backrest 300 is provided with the first articulated arm 72. One end of the link 71 is articulated with the first articulated arm 72. The other end of the link 71 is articulated with the linkage 5. The linkage 5 has a first connecting portion 51 and a second connecting portion 52. The first connecting portion 51 is fixedly connected to the sliding plate 31, and the second connecting portion 52 is directly or indirectly articulated with the other end of the telescopic rod 4.

[0033] In some alternative embodiments, the articulation between the first articulated arm and the link 71 is realized by a quick-release pin. When disassembly and assembly are required, only by pulling out the quick-release pin, the backrest 300 can make a closing movement relative to the seat cushion 2, so as to store the backrest 300, which can save the logistics transportation cost and storage cost to the greatest extent. And when the consumer receives the product later, only by inserting the quick-release pin, the backrest 300 can be opened.

[0034] Specifically, the articulation mechanism 6 includes a second articulated arm 61, a third articulated arm 62, and an articulation shaft 63. The second articulated arm 61 extends from the side of the armrest 200 facing the backrest 300. The third articulated arm 62 extends from the side of the backrest 300 facing the armrest 200. The second articulated arm 61 and the third articulated arm 62 are articulated through the articulation shaft 63, and the third articulated arm 62 is located inside the second articulated arm 61.

[0035] The upper end of the chassis 1 is provided with a clamping groove 11, and the telescopic rod 4 is clamped in the clamping groove 11. The setting of the clamping groove 11 can expand an installation space inside this office chair, enabling many components to be installed between the chassis 1 and the seat 100. The telescopic rod 4 includes a telescopic outer rod 41 and a telescopic inner rod 42. The output end of the telescopic inner rod 42 is fixedly connected to the chassis 1 and its telescoping is controlled by a control mechanism 8. The end of the telescopic outer rod 41 is hinged to the second connecting portion 52 of the linkage member 5.

[0036] The control mechanism 8 includes a wire control switch 81 and a locking switch 82. The wire control switch 81 is installed on one side of the seat 100 and is connected to the locking switch 82 through a cable. The locking switch 82 includes a switch base 821 and a flipper 822. A fixing hole 821a is provided on the switch base 821. One end of the telescopic inner rod 42 passes through the fixing hole 821a and is fixedly connected to the fixing hole 821a. The end of the telescopic inner rod 42 has a trigger head 421. The flipper 822 is rotatably arranged inside the switch base 821. The outer side of the flipper 822 is connected to the end of the wire control switch 81. The acting end of the flipper 822 can be pressed against the trigger head 421 when being pulled by the wire control switch 81, so that the telescopic rod 4 is in a state of buffer telescoping. Or when the flipper 822 is not pulled by the wire control switch 81, the trigger head 421 resets and the telescopic rod 4 is in a non-buffer telescoping state. Above, a return spring is arranged between the flipper 822 and the switch base 821, which can keep the flipper 822 away from the trigger head 421 for a long time. Or by arranging a return spring at the end of the wire control switch 81 (prior art), when the wire control switch 81 is not pulled up, the flipper 822 can quickly reset, the trigger head 421 is separated from the downward pressure of the flipper 822, and thus resets. The telescoping function of the telescopic rod 4 stops, so that this office chair can hover at any position and any angle.

[0037] Specifically, the sliding plate 31 includes a fixed end 312 and a sunken end 313. The fixed end 312 is located on both sides of the sunken end 313 and the height of the fixed end 312 is higher than that of the sunken end 313. The fixed end 312 is used for fixed connection with the seat cushion 2. The sliding groove 311 is located on the sunken end 313. With such a setting, the sliding of the seat cushion 2 can avoid friction with the chassis 1 and is convenient for the installation and fixation of the related components of the sliding mechanism 3, and it is more in line with the modular installation requirements during later production and installation.

[0038] Specifically, a limiting piece 34 is further provided on the sliding plate 31. An inner groove 341 and an outer groove 342 are provided on the limiting piece 34. The inner groove 341 is longitudinally communicated with the sliding groove 311 and is arranged identically. The outer groove 342 is just for the pressure plate 33 to be nested. The upper end surface of the positioning seat 32 is just flush with the groove surface of the outer groove 342. The length of the sliding groove 311 is greater than the length of the positioning seat 32. Preferably, the limiting piece 34 is made of hard plastic material and has a smooth characteristic.

[0039] A roller assembly 9 is further provided at the upper end of the chassis 1 and the lower end of the sliding plate 31. The roller assembly 9 is composed of several rollers that can assist the sliding of the sliding plate 31. The rollers can be pulleys, bearings, etc. With such a setting, when the upper cushion 2 slides back and forth, it has the auxiliary support of the bottom rollers, and its sliding is smoother.

[0040] Specifically, in order to make the installation of the telescopic rod 4 and the linkage 5 more in line with the straight-in and straight-out direction, here, a third connecting portion 54 also extends from one side of the second connecting portion 52. Among them, the third connecting portion 54 is perpendicular to the second connecting portion 52, and the third connecting portion 54 is also just perpendicular to the telescopic outer rod 41. The telescopic outer rod 41 is hinged to the third connecting portion 54.

[0041] The linkage principle of the seat cushion and the backrest of the present utility model:

[0042] Through the control of the control switch, the wire control switch 81 inside it can control the triggering and releasing of the triggering head 421 of the telescopic inner rod 42, so that the telescopic rod 4 can be telescopic and non-telescopic. When it is in the telescopic state, the seat cushion 2 can move forward or backward. The person sitting on it only needs to move forward or backward forcefully to push the seat cushion 2 forward or backward. At the same time, because there is a hinge mechanism 6 between the backrest 300 and the armrest 200, the backrest 300 rotates around the hinge axis 63. The lower part of the backrest 300 is also hinged to the linkage 5 through the connecting rod 71 mechanism 7, and the linkage 5 is simultaneously connected to the telescopic rod 4 and the sliding plate 31. Therefore, when the seat cushion 2 slides forward, since the telescopic outer rod 41 is driven to telescopic forward, that is, a compression action is performed on the telescopic inner rod 42. At this time, an energy storage process is formed. The telescopic outer rod 41 moves forward, thus driving the linkage 5 and the connecting rod 71 to move forward. Then the bottom of the backrest 300 also moves in the direction of the chassis 1, so the upper backrest 300 tilts backward, and thus the linkage between the backrest 300 and the seat cushion 2 is realized. When the seat cushion 2 moves backward, the backrest 300 moves closer to the seat cushion 2, that is, returns to the tilted-back state. And the position where the seat cushion 2 moves back and forth in the present utility model, as well as the angle of the backrest 300 that is linked with the seat cushion 2 to adjust the angle, can be fixed at any time, which is controlled by controlling the telescopic rod 4 through the wire control switch 81.

[0043] The principle of the present utility model to obtain the maximum reclining angle and not easily occupy the aisle space:

[0044] When the seat cushion 2 moves forward, the backrest 300 reclines. However, the forward movement of the seat cushion 2 means that the center of gravity of the human body also moves forward, and then a small part of the center of gravity leans on the backrest 300. Therefore, the angle of the backrest 300 can be lowered very low. In theory, the reclining angle of the backrest 300 is proportional to the forward movement distance of the seat cushion 2. As long as the length of the seat cushion 2 and the length of the sliding plate 31 are controlled, the maximum reclining angle of the backrest 300 can be obtained. As described above, at the same reclining angle, this office chair is obtained by the linkage of the forward movement of the seat cushion 2. Therefore, even if the backrest 300 has the same reclining angle as a traditional seat, the backward displacement dimension of the uppermost end position of the backrest 300 is lower than that of the traditional seat. Because the rotation axis of the backrest 300 in this office chair is at the position of the armrest 200, that is, the position of the hinge shaft 63, while the rotation axis of the backrest 300 of the traditional seat is on the C-shaped plate at the bottom of the backrest 300, so the backward displacement dimension of the uppermost end of its backrest 300 is larger than that of this office chair.

[0045] In addition, when the telescopic rod 4 is in the telescopic state, due to the buffering effect of the telescopic rod 4, after the backrest 300 at the rear end is connected to the telescopic rod 4 through the link 71 mechanism 7, a more comfortable buffered sitting posture can also be obtained, and its buffering is also added with the pressure of the human body's own weight on the seat cushion 2, so that the buffering of the backrest 300 is slower and more stable.

[0046] The above embodiments are only the preferred embodiments of the present utility model, and cannot be used to limit the protection scope of the present utility model. Any non-substantial changes and substitutions made by those skilled in the art based on the present utility model fall within the protection scope required by the present utility model.

Claims

1. An office chair seat cushion and backrest linkage mechanism, comprising a seat, armrests, and a backrest, characterized in that: The seat includes a chassis and a seat cushion. The armrest is fixedly connected to the chassis. A sliding mechanism and a telescopic buffer mechanism are provided between the seat cushion and the chassis. The upper end of the sliding mechanism is fixedly connected to the seat cushion, and the lower end is fixedly connected to the chassis to enable the seat cushion to slide relative to the chassis. One end of the telescopic buffer mechanism is connected to the backrest through a link mechanism, and the other end is connected to the chassis. The sliding mechanism and the telescopic buffer mechanism are linked through a linkage. An articulated mechanism is also provided between the backrest and the armrest, and the backrest can be rotated and folded or turned outwards around the armrest through the articulated mechanism.

2. The linkage mechanism between the seat cushion and the backrest of an office chair according to claim 1, characterized in that: The sliding mechanism includes a sliding plate, a positioning seat, and a pressing plate. One side of the sliding plate is fixedly connected to the seat cushion. A positioning seat is fixedly connected to the upper end of the chassis. A sliding groove is provided on the sliding plate, and the sliding plate is sleeved on the positioning seat through the sliding groove. The pressing plate is fixedly connected to the positioning seat downward from above the sliding groove. The telescopic buffer mechanism includes a telescopic rod and a control mechanism for controlling the telescopic movement of the telescopic rod. One end of the telescopic rod is fixedly connected to the chassis, and the other end extends to one side of the backrest. The link mechanism includes a link and a first articulated arm. The lower end of the backrest is provided with a first articulated arm. One end of the link is articulated to the first articulated arm, and the other end of the link is articulated to the linkage. The linkage has a first connection portion and a second connection portion, wherein the first connection portion is fixedly connected to the sliding plate, and the second connection portion is articulated to the other end of the telescopic rod.

3. The linkage mechanism between the seat cushion and the backrest of an office chair according to claim 1, characterized in that: The articulated mechanism includes a second articulated arm, a third articulated arm, and an articulated shaft. The second articulated arm extends from the side of the armrest facing the backrest, and the third articulated arm extends from the side of the backrest facing the armrest. The second articulated arm and the third articulated arm are articulated through the articulated shaft, and the third articulated arm is located inside the second articulated arm.

4. The linkage mechanism between the seat cushion and the backrest of an office chair according to claim 2, wherein: A clamping groove is provided at the upper end of the chassis, and the telescopic rod is clamped in the clamping groove. The telescopic rod includes a telescopic outer rod and a telescopic inner rod. The output end of the telescopic inner rod is fixedly connected to the chassis and its telescopic movement is controlled by the control mechanism. The end of the telescopic outer rod is articulated to the second connection portion of the linkage.

5. The linkage mechanism between the seat cushion and the backrest of an office chair according to claim 4, characterized in that: 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 seat and a toggle. A fixing hole is provided on the switch seat. 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 toggle is rotatably provided inside the switch seat. The outer side of the toggle is connected to the end of the wire control switch. The acting end of the toggle can be pressed against the trigger head when 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 of the telescopic rod is reset when the toggle is not pulled by the wire control switch, and the telescopic rod is in a state of not being able to buffer and stretch.

6. The linkage mechanism between the seat cushion and the backrest of an office chair according to claim 2, characterized in that: The sliding plate includes a fixed end and a sunken end. The fixed ends are located on both sides of the sunken end, and the height of the fixed ends is higher than that of the sunken end. The fixed ends are used for fixedly connecting the seat cushion, and the sliding groove is located on the sunken end.

7. The linkage mechanism between the seat cushion and the backrest of an office chair according to claim 6, characterized in that: A limiting piece is further arranged on the sliding plate. An inner groove and an outer groove are arranged on the limiting piece. The inner groove is longitudinally communicated with the sliding groove and is arranged identically. The outer groove is just for the pressing plate to be nested. The upper end surface of the positioning seat is just flush with the groove surface of the outer groove. The length of the sliding groove is greater than the length of the positioning seat.

8. A linkage mechanism for an office chair seat cushion and backrest according to any one of claims 2, 6 or 7, characterized in that: A roller assembly is further arranged at the upper end of the chassis and the lower end of the sliding plate. The roller assembly is composed of a plurality of rollers that can assist the sliding of the sliding plate.

9. The linkage mechanism between the seat cushion and the backrest of an office chair as claimed in claim 4, wherein: A third connecting portion also extends from one side of the second connecting portion. The telescopic outer rod is hinged to the third connecting portion.

Images