Seat back adjustment mechanism and seat

Abstract

This utility model discloses a seat backrest adjustment mechanism and a seat. The seat backrest adjustment mechanism includes a lower bracket, an upper bracket, a front connecting rod, a rear connecting rod, and a gas spring. The upper end of the front connecting rod is hinged to the upper bracket to allow it to rotate relative to the upper bracket around a first axis, and the lower end of the front connecting rod is hinged to the lower bracket to allow it to rotate relative to the lower bracket around a second axis. The upper end of the rear connecting rod is hinged to the upper bracket to allow it to rotate relative to the upper bracket around a third axis, and the lower end of the rear connecting rod is hinged to the lower bracket to allow it to rotate relative to the lower bracket around a fourth axis. The first, second, third, and fourth axes are all arranged in parallel. The seat backrest is mounted on the upper bracket. The two ends of the gas spring are respectively hinged to the front and rear connecting rods, and a control button is provided on the gas spring. This utility model can drive the backrest to move back and forth, allowing the seat to accommodate users of different body types.

Description

Technical Field

[0001] This utility model relates to the field of seating technology, specifically to a seat back adjustment mechanism and a seat. Background Technology

[0002] Traditional chairs have a fixed backrest and seat cushion, and the backrest cannot be adjusted, making it difficult to meet people's growing comfort needs. In order to overcome the shortcomings of traditional chairs, some existing office chairs and gaming chairs have a backrest that is rotatably mounted on the main frame of the chair, allowing the backrest to swing back and forth relative to the seat cushion. This backrest swing adjustment method can only accommodate the user's reclining posture, but cannot achieve backrest movement or change the seat depth, thus it cannot accommodate users of different body types. Utility Model Content

[0003] The purpose of this utility model is to provide a seat back adjustment mechanism and a seat, which can adjust the position of the seat back in the front and back direction so that the seat depth can be adapted to users of different body types.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The seat back adjustment mechanism includes a lower support, an upper support, a front link, a rear link, and a gas spring;

[0006] The upper end of the front link is hinged to the upper bracket to allow the front link to rotate relative to the upper bracket about a first axis, and the lower end of the front link is hinged to the lower bracket to allow the front link to rotate relative to the lower bracket about a second axis. The upper end of the rear link is hinged to the upper bracket to allow the rear link to rotate relative to the upper bracket about a third axis, and the lower end of the rear link is hinged to the lower bracket to allow the rear link to rotate relative to the lower bracket about a fourth axis. The first axis, second axis, third axis, and fourth axis are all arranged in parallel. The distance between the first axis and the second axis is equal to the distance between the third axis and the fourth axis, and the distance between the first axis and the third axis is equal to the distance between the second axis and the fourth axis.

[0007] The seat back is mounted on the upper bracket;

[0008] The two ends of the pneumatic rod are hinged to the front and rear connecting rods, respectively. A control button is provided on the pneumatic rod. When the control button is pressed, the two ends of the pneumatic rod can move relative to each other, and when the control button is released, the two ends of the pneumatic rod are fixed relative to each other.

[0009] Preferably, the front connecting rod is provided with a front groove that opens to the rear, and the rear connecting rod is provided with a rear groove that opens to the front. The front groove and the rear groove together form a receiving space, in which the pneumatic rod is placed.

[0010] Preferably, the front groove is provided with a plurality of front support ribs arranged in the vertical direction and connected between the two side walls of the front groove; the rear groove is provided with a plurality of rear support ribs arranged in the vertical direction and connected between the two side walls of the rear groove.

[0011] Preferably, the pneumatic rod includes a cylinder body and a piston rod passing through the cylinder body. The cylinder body is hinged to a rear connecting rod, and the piston rod is hinged to a front connecting rod. A control button is located at the end of the piston rod, and a toggle lever is movably mounted on the piston rod. The toggle lever can move relative to the piston rod between a first position of pressing the control button and a second position of releasing the control button.

[0012] Preferably, the piston rod has a connecting seat that is hinged to the front connecting rod at its end, one end of the actuating rod is hinged to the connecting seat, and a switch connected to the other end of the actuating rod is installed on the lower bracket.

[0013] Preferably, the switch is connected to the other end of the lever via a pull cord, and a rope loop is fixedly connected to the connecting seat, with the pull cord threaded inside the rope loop.

[0014] Preferably, the upper bracket is provided with two opposing first connecting ears, the tops of the front link and the rear link are both placed between the two first connecting ears, and two staggered pivots are provided between the two first connecting ears, with the tops of the front link and the rear link respectively mounted on the two pivots.

[0015] Preferably, the bottom of the rear connecting rod is provided with two opposing second connecting ears, and a turntable is provided on the lower bracket between the two second connecting ears. A first pivot is passed through the middle of the turntable, and the two ends of the first pivot are respectively connected to the two second connecting ears. A mounting groove is provided on the turntable, and a second pivot located in front of the first pivot is provided on the edge of the turntable. The bottom of the front connecting rod is placed in the mounting groove and pivotally connected to the second pivot.

[0016] Preferably, one end of the pneumatic rod is hinged to the front connecting rod, and the other end is sleeved on the first pivot to be hinged to the rear connecting rod.

[0017] Seat, including the aforementioned seat back adjustment mechanism.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] In this invention, a parallel four-bar linkage is formed by a front link, a rear link, an upper bracket, and a lower bracket. A pneumatic rod is installed between the front and rear links to provide stable support. When adjustment is needed, pressing the control button causes the pneumatic rod to extend or retract, deforming the parallel four-bar linkage. The upper bracket maintains forward and backward translation, which in turn causes the backrest to move forward and backward, thereby changing the seat depth to accommodate users of different body types. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a cross-sectional view of the present invention;

[0022] Figure 3 for Figure 2 Enlarged view at point A in the middle;

[0023] Figure 4 This is a schematic diagram of one usage state of the present invention;

[0024] Figure 5 This is a schematic diagram of the installation of this utility model.

[0025] The components are as follows: 10. Front connecting rod; 11. Front groove; 12. Front support rib; 20. Rear connecting rod; 21. Rear groove; 22. Rear support rib; 23. Second connecting ear; 30. Upper bracket; 31. First connecting ear; 32. Rotary shaft; 33. Rotary shaft; 40. Lower bracket; 41. Turntable; 42. First pivot; 43. Second pivot; 44. Mounting groove; 50. Pneumatic rod; 51. Cylinder; 52. Piston rod; 53. Control button; 54. Actuating lever; 55. Connecting seat; 56. Pull rope; 57. Rope loop; 60. Backrest. Detailed Implementation

[0026] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. Unless otherwise specified, the materials and equipment used in this embodiment are all commercially available. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0027] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected," "linked," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a connection through an intermediary, or a connection within two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] like Figure 1 , 2 As shown in Figures 3, 4, and 5, this utility model discloses a seat back adjustment mechanism, which includes a lower support 40, an upper support 30, a front connecting rod 10, a rear connecting rod 20, and a gas spring 50. The upper end of the front connecting rod 10 is hinged to the upper support 30, allowing it to rotate relative to the upper support 30 around a first axis O1. The lower end of the front connecting rod 10 is hinged to the lower support 40, allowing it to rotate relative to the lower support 40 around a second axis O2. The upper end of the rear connecting rod 20 is hinged to the upper support 30, allowing it to rotate relative to the upper support 30 around a third axis O3. The lower end of the rear connecting rod 20 is hinged to the lower support 40. On the bracket 40, the rear link 20 can rotate relative to the lower bracket 40 around the fourth axis O4. The first axis O1, the second axis O2, the third axis O3, and the fourth axis O4 are arranged in parallel and all extend laterally. The distance between the first axis O1 and the second axis O2 is equal to the distance between the third axis O3 and the fourth axis O4. The distance between the first axis O1 and the third axis O3 is equal to the distance between the second axis O2 and the fourth axis O4. In this way, the front link 10, the rear link 20, the upper bracket 30, and the lower bracket 40 form a parallel four-bar linkage mechanism. The seat back 60 is mounted on the upper bracket 30.

[0030] The pneumatic rod 50 is positioned between the front connecting rod 10 and the rear connecting rod 20, with its two ends hinged to the front connecting rod 10 and the rear connecting rod 20 respectively. A control button 53 is provided on the pneumatic rod 50. When the control button 53 is pressed, the two ends of the pneumatic rod 50 can move relative to each other. At this time, the pneumatic rod 50 forms an elastic support between the front connecting rod 10 and the rear connecting rod 20. When the control button 53 is released, the two ends of the pneumatic rod 50 are relatively fixed, so that the pneumatic rod 50 forms a rigid support between the front connecting rod 10 and the rear connecting rod 20.

[0031] When the seat is in use, the control button 53 on the gas spring 50 is in the released state. The gas spring 50 forms a rigid support between the front link 10 and the rear link 20. The user's back applies backward pressure to the backrest 60. Since the two ends of the gas spring 50 are relatively fixed, it can keep the parallel four-bar linkage composed of the front link 10, the rear link 20, the upper bracket 30, and the lower bracket 40 in a fixed state. The fixed parallel four-bar linkage allows the backrest 60 to provide stable support for the user's back. When it is necessary to adjust the backrest 60's front and back position, press the control button 53. The gas spring 50 provides elastic support between the front link 10 and the rear link 20. At this time, the backrest 60 can be moved back and forth, and the gas spring 50 extends and retracts accordingly to adapt to the shape change of the parallel four-bar linkage. The upper bracket 30 moves back and forth to complete the backrest 60's front and back movement. After the backrest 60 is moved into place, release the control button 53 to keep the backrest 60 in a fixed position.

[0032] In this invention, a parallel four-bar linkage is formed by the front link 10, the rear link 20, the upper bracket 30, and the lower bracket 40. A pneumatic rod 50 is set between the front link 10 and the rear link 20. The pneumatic rod 50 can provide stable support between the front link 10 and the rear link 20. When adjustment is needed, the control button 53 is pressed to extend and retract the pneumatic rod 50, which causes the parallel four-bar linkage to deform. The upper bracket 30 maintains forward and backward translation, which in turn causes the backrest 60 to move forward and backward, thereby changing the seat depth so that the seat can meet the needs of users of different body types.

[0033] In a preferred embodiment, the front connecting rod 10 has a front groove 11 opening towards the rear, and the rear connecting rod 20 has a rear groove 21 opening towards the front. The front groove 11 and the rear groove 21 together form a receiving space in which the gas spring 50 is placed. In this way, the gas spring 50 is protected by the front connecting rod 10 and the rear connecting rod 20, while also preventing the gas spring 50 from occupying too much space, making the overall structure of the seat more compact. To ensure high strength of the front connecting rod 10 and the rear connecting rod 20, a plurality of front support ribs 12 arranged vertically are provided in the front groove 11, and the front support ribs 12 are connected between the two side walls of the front groove 11. A plurality of rear support ribs 22 arranged vertically are provided in the rear groove 21, and the rear support ribs 22 are connected between the two side walls of the rear groove 21.

[0034] The pneumatic rod 50 includes a cylinder body 51 and a piston rod 52. The piston rod 52 passes through the cylinder body 51. The cylinder body 51 is hinged to the rear connecting rod 20, and the piston rod 52 is hinged to the front connecting rod 10. A control button 53 is located at the end of the piston rod 52. A toggle lever 54 is rotatably connected to the piston rod 52. The toggle lever 54 can swing relative to the piston rod 52 between a first position and a second position. When the toggle lever 54 swings to the first position, the toggle lever 54 presses the control button 53, so that the pneumatic rod 50 is in an elastic support state between the front connecting rod 10 and the rear connecting rod 20. When the toggle lever 54 swings to the second position, the toggle lever 54 disengages from the control button 53, that is, the toggle lever 54 releases the control button 53. At this time, the pneumatic rod 50 is in a rigid support state between the front connecting rod 10 and the rear connecting rod 20.

[0035] To facilitate the installation of the actuating lever 54 and the piston rod 52, and to facilitate the hinged connection of the piston rod 52 to the front connecting rod 10, a connecting seat 55 hinged to the front connecting rod 10 is installed at the end of the piston rod 52. One end of the actuating lever 54 is hinged to the connecting seat 55. A switch connected to the other end of the actuating lever 54 is installed on the lower bracket 40. The switch drives the actuating lever 54, causing it to swing between a first position and a second position. Specifically, the switch is connected to the other end of the actuating lever 54 via a pull rope 56. A rope loop 57 is fixed on the connecting seat 55, and the pull rope 56 passes through the rope loop 57. The user can control the actuating lever 54 by operating the switch and pulling the rope 56. For ease of operation, the switch can be installed on the seat cushion or armrest connected to the lower bracket 40.

[0036] It should be noted that the component on the piston rod 52 used to press the control button 53 is not limited to the aforementioned swingable lever 54; it can also be a movable component mounted on the piston rod 52 or the connecting seat 55.

[0037] The upper bracket 30 is provided with two opposing first connecting ears 31. The tops of the front connecting rod 10 and the rear connecting rod 20 are both placed between the two first connecting ears 31. A rotating shaft 32 and a rotating shaft 33 are provided between the two first connecting ears 31. The rotating shaft 32 is located in front of the rotating shaft 33 and is offset from the rotating shaft 33 by a certain distance. The top of the front connecting rod 10 is mounted on the rotating shaft 32, and the top of the rear connecting rod 20 is mounted on the rotating shaft 33. The central axis of the rotating shaft 32 is the aforementioned first axis O1, and the central axis of the rotating shaft 33 is the aforementioned third axis O3. During installation, the tops of the front connecting rod 10 and the rear connecting rod 20 are placed between the two first connecting ears 31, and the rotating shaft 32 and the rotating shaft 33 are inserted from one side of the upper bracket 30 to connect the tops of the front connecting rod 10 and the rear connecting rod 20 to the two first connecting ears 31.

[0038] The bottom of the rear connecting rod 20 is provided with two opposing second connecting ears 23. A turntable 41 is provided on the lower bracket 40. The turntable 41 is placed between the two second connecting ears 23. A first pivot 42 is passed through the middle of the turntable 41. The two ends of the first pivot 42 are respectively connected to the two second connecting ears 23. A mounting groove 44 is provided on the turntable 41. A second pivot 43 is provided on the edge of the turntable 41. The second pivot 43 is located in front of the first pivot 42, so that the second pivot 43 forms an eccentric shaft on the turntable 41. The bottom of the front connecting rod 10 is placed in the mounting groove 44 and pivotally connected to the second pivot 43.

[0039] The central axis of the second pivot 43 is the aforementioned second axis O2, and the central axis of the first pivot 42 is the aforementioned fourth axis O4. During assembly, the turntable 41 is placed between the two second connecting ears 23, and the first pivot 42 is passed across one side of the rear connecting rod 20 to pivotally connect the turntable 41 and the rear connecting rod 20. Then, the lower end of the front connecting rod 10 is inserted into the mounting slot 44, and the second pivot 43 is passed across one side of the turntable 41 to pivotally connect the front connecting rod 10 and the lower bracket 40.

[0040] For ease of installation, one end of the pneumatic rod 50 can be hinged to the front connecting rod 10, and the other end of the pneumatic rod 50 can be fitted onto the first pivot 42, so that the other end of the pneumatic rod 50 is hinged to the rear connecting rod 20. Specifically, the cylinder 51 of the pneumatic rod 50 is fitted onto the first pivot 42. During assembly, the turntable 41 is placed between the two second connecting ears 23, and the lower end of the cylinder 51 of the pneumatic rod 50 is inserted into the turntable 41 from the mounting groove 44. The cylinder 51 of the pneumatic rod 50 passes through the first pivot 42 from one side of the rear connecting rod 20, so that the first pivot 42 passes through the second connecting ears 23, the turntable 41, and the lower end of the cylinder 51 of the pneumatic rod 50.

[0041] The seat of this utility model includes the aforementioned seat back adjustment mechanism. The other structures of the seat are the same as those in the prior art and will not be described in detail here.

[0042] Finally, it should be noted that the above embodiments are only optional embodiments of this utility model and should not be used to limit the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A seat backrest adjustment mechanism, characterized in that, It includes a lower bracket, an upper bracket, a front linkage, a rear linkage, and a pneumatic strut; The upper end of the front link is hinged to the upper bracket to allow the front link to rotate relative to the upper bracket about a first axis, and the lower end of the front link is hinged to the lower bracket to allow the front link to rotate relative to the lower bracket about a second axis. The upper end of the rear link is hinged to the upper bracket to allow the rear link to rotate relative to the upper bracket about a third axis, and the lower end of the rear link is hinged to the lower bracket to allow the rear link to rotate relative to the lower bracket about a fourth axis. The first axis, second axis, third axis, and fourth axis are all arranged in parallel. The distance between the first axis and the second axis is equal to the distance between the third axis and the fourth axis, and the distance between the first axis and the third axis is equal to the distance between the second axis and the fourth axis. The seat back is mounted on the upper bracket; The two ends of the pneumatic rod are hinged to the front and rear connecting rods, respectively. A control button is provided on the pneumatic rod. When the control button is pressed, the two ends of the pneumatic rod can move relative to each other, and when the control button is released, the two ends of the pneumatic rod are fixed relative to each other.

2. The seat back adjustment mechanism as described in claim 1, characterized in that, The front connecting rod has a front groove that opens to the rear, and the rear connecting rod has a rear groove that opens to the front. The front groove and the rear groove together form a receiving space in which the pneumatic rod is placed.

3. The seat back adjustment mechanism as described in claim 2, characterized in that, The front groove has multiple front support ribs arranged vertically and connected between the two side walls of the front groove; the rear groove has multiple rear support ribs arranged vertically and connected between the two side walls of the rear groove.

4. The seat back adjustment mechanism as described in claim 1, characterized in that, The pneumatic lever includes a cylinder body and a piston rod passing through the cylinder body. The cylinder body is hinged to a rear connecting rod, and the piston rod is hinged to a front connecting rod. A control button is located at the end of the piston rod, and a toggle lever is movably mounted on the piston rod. The toggle lever can move relative to the piston rod between a first position where the control button is pressed and a second position where the control button is released.

5. The seat back adjustment mechanism as described in claim 4, characterized in that, The piston rod has a connecting seat that is hinged to the front connecting rod at the end. One end of the actuating rod is hinged to the connecting seat, and a switch that is connected to the other end of the actuating rod is installed on the lower bracket.

6. The seat back adjustment mechanism as described in claim 5, characterized in that, The switch is connected to the other end of the lever via a pull cord. A rope loop is fixedly connected to the connecting base, and the pull cord is threaded through the rope loop.

7. The seat back adjustment mechanism as described in claim 1, characterized in that, The upper bracket is provided with two opposing first connecting ears. The tops of the front link and the rear link are both placed between the two first connecting ears. Two pivots are provided between the two first connecting ears, which are staggered front to back. The tops of the front link and the rear link are respectively mounted on the two pivots.

8. The seat back adjustment mechanism as described in claim 1, characterized in that, The bottom of the rear connecting rod is provided with two opposing second connecting lugs. A turntable is provided on the lower bracket between the two second connecting lugs. A first pivot is passed through the middle of the turntable. The two ends of the first pivot are respectively connected to the two second connecting lugs. A mounting groove is provided on the turntable. A second pivot is provided on the edge of the turntable in front of the first pivot. The bottom of the front connecting rod is placed in the mounting groove and pivotally connected to the second pivot.

9. The seat back adjustment mechanism as described in claim 8, characterized in that, One end of the pneumatic rod is hinged to the front connecting rod, and the other end is fitted onto the first pivot to be hinged to the rear connecting rod.

10. A seat, characterized in that, Includes the seat back adjustment mechanism as described in any one of claims 1-9.

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