Seat backrest and cushion linkage structure and seat

Abstract

The utility model discloses a linkage structure of a seat backrest and a seat cushion and a seat. The linkage structure of the seat backrest and the seat cushion comprises a base plate, a backrest auxiliary support, a backrest main support, the seat cushion and a movable seat, the backrest auxiliary bracket is pivoted on the chassis, the bottom of the backrest main bracket is fixedly connected with a connecting seat, and the backrest auxiliary bracket is pivoted with the connecting seat through a rotating shaft which transversely penetrates through the backrest auxiliary bracket and the connecting seat; a limiting groove extending front and back is formed in the backrest auxiliary support, a swing piece is embedded in the limiting groove, and the top of the swing piece is pivoted to the rotating shaft; a first limiting face located on the rear side of the rotating shaft is formed at the top of the swing piece, a second limiting face located above the first limiting face is arranged at the bottom of the connecting base, and a first elastic piece is arranged between the swing piece and the connecting base. The rear end of the movable seat is hinged to the bottom of the swing part, and the front end of the movable seat is hinged to the cushion. When the posture of a user is changed, each position of the body of the user can be well supported, and the comfort of the seat is improved.

Description

Technical Field

[0001] This utility model relates to the field of seat technology, specifically to a linkage structure between a seat back and a seat cushion, and a seat. Background Technology

[0002] Traditional chairs have relatively fixed backrests and seat cushions, making them unsuitable for different sitting postures. To address these shortcomings, some existing office and study chairs have incorporated movable backrests. Specifically, the backrest can swing back and forth relative to the chair's base. When the user leans back, the backrest swings backward relative to the seat cushion. After the backrest swings backward at a certain angle, the user's buttocks remain fixed because the seat cushion position remains constant. As the distance between the backrest and seat cushion increases, the user's back moves relative to the backrest. The parts of the backrest that support the user's back, such as the headrest at the top of the backrest, shift relative to the user's body. This results in inadequate support for the user's upper body. Although the user can adjust their position to achieve proper support for the upper body, the large gap between the backrest and seat cushion prevents adequate support for the buttocks. In other words, existing chairs, after the backrest swings backward, fail to provide optimal support for all parts of the user's body. Utility Model Content

[0003] The purpose of this utility model is to provide a linkage structure between the seat back and the seat cushion, and a seat that can provide better support for various parts of the user's body when the user changes posture, thereby improving the comfort of the seat.

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

[0005] The linkage structure between the seat back and the seat cushion includes a chassis, a secondary backrest support, a main backrest support, a seat cushion, and a movable seat.

[0006] The backrest sub-support is pivotally connected to the chassis so that the backrest sub-support can swing back and forth relative to the chassis. The bottom of the backrest main support is fixedly connected to the connecting seat located above the backrest sub-support. The backrest sub-support and the connecting seat are pivotally connected by a pivot shaft that passes through them. The backrest sub-support is provided with a front-to-back extending limiting groove. A swinging member is embedded in the limiting groove. The top of the swinging member is pivotally connected to the pivot shaft so that the swinging member can swing back and forth in the limiting groove.

[0007] The top of the swing member forms a first limiting surface located behind the rotating shaft, and the bottom of the connecting seat is provided with a second limiting surface located behind the rotating shaft and above the first limiting surface. A first elastic member is provided between the swing member and the connecting seat. The first elastic member is used to apply elastic stress to the swing member and the connecting seat so that the first limiting surface and the second limiting surface abut against each other.

[0008] The rear end of the movable seat is hinged to the bottom of the swinging component, and the front end is hinged to the seat cushion.

[0009] Preferably, the movable seat is provided with a guide groove that extends from one side of the movable seat to the other side; a limiting rod that extends laterally and passes through the guide groove is fixed on the backrest sub-support.

[0010] Preferably, the limiting rod is a locking screw that passes through the guide groove.

[0011] Preferably, a support base is fixedly connected to the backrest sub-support and placed below the movable seat. The lower surface of the movable seat is flat, and the top surface of the support base is an arc-shaped surface that abuts against the lower surface of the movable seat and convexes upward in the middle. The two ends of the limiting rod are fixed to the support base.

[0012] Preferably, the cross-section of the limiting rod is set to be circular so that the limiting rod is configured to slide relative to the movable seat in the length direction of the guide groove and rotate relative to the movable seat.

[0013] Preferably, a limiting seat is fixedly connected to the front side of the backrest sub-support, and the limiting seat and the backrest sub-support together form a limiting groove.

[0014] Preferably, a second elastic element is provided between the swinging element and the limiting seat.

[0015] Preferably, a support block is fixed to the front side of the swing member, and the first elastic member is a spring located on the front side of the rotating shaft and clamped between the support block and the connecting seat.

[0016] Preferably, the top front side of the swing member is an arc surface, the first limiting surface extends backward from the rear of the arc surface, and the bottom of the connecting seat is provided with a rearward extending support plate, the lower surface of the support plate forming a second limiting surface.

[0017] The seat includes the aforementioned linkage structure between the seat back and the seat cushion.

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

[0019] In this invention, the swinging component is linked with the movable seat. When the user uses the chair, their back presses against the main backrest support, causing the main backrest support to swing backward at a small angle. The seat cushion then moves forward by a small displacement, ensuring that the positional relationship between the seat cushion and the main backrest support meets the user's normal sitting posture. As the user continues to press against the main backrest support and gradually leans back, the seat cushion can move backward to follow the backward swinging angle of the main backrest support and the secondary backrest support. This ensures that the distance between the support position for the user's buttocks and the support position for the user's back remains essentially unchanged, providing better support for all parts of the user's body and improving the comfort of the chair. 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 of point A in the middle;

[0023] Figure 4 for Figure 2 A magnified view of point B in the middle.

[0024] Among them: 10, backrest sub-bracket; 11, limiting seat; 20, backrest main bracket; 21, connecting seat; 211, support plate; 212, second limiting surface; 30, seat cushion; 40, movable seat; 41, guide groove; 42, plane; 50, rotating shaft; 60, swinging component; 61, first limiting surface; 62, spring; 63, spring; 64, arc surface; 65, support block; 70, support seat; 71, limiting rod; 72, arc surface. Detailed Implementation

[0025] 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.

[0026] 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.

[0027] 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.

[0028] like Figure 1 , 2As shown in Figures 3 and 4, this utility model discloses a linkage structure between a seat back and a seat cushion. It includes a chassis (not shown), a backrest sub-support 10, a backrest main support 20, a seat cushion 30, and a movable seat 40. The backrest sub-support 10 is pivotally connected to the chassis, allowing it to swing back and forth relative to the chassis. The seat cushion 30 is located above the chassis and is configured to move back and forth relative to the chassis. When the backrest sub-support 10 swings back and forth relative to the chassis, it drives the seat cushion 30 to move back and forth. The backrest main support 20 is located above the backrest sub-support 10. A connecting seat 21 located above the backrest sub-support 10 is fixedly connected to the bottom of the main backrest support 20. A horizontally extending pivot 50 passes through the connecting seat 21 and the backrest sub-support 10, pivotally connecting the connecting seat 21 and the backrest sub-support 10, so that the main backrest support 20 can swing back and forth relative to the backrest sub-support 10. A front-to-back extending limiting groove is provided on the backrest sub-support 10. A swing member 60 is embedded in the limiting groove. The top of the swing member 60 is pivotally connected to the pivot 50, so that the swing member 60 can swing back and forth relative to the backrest sub-support 10 within the limiting groove. The top of the swing member 60 forms a first limiting surface 61 located behind the pivot 50, and the bottom of the connecting seat 21 is provided with a second limiting surface 212 located behind the pivot 50, with the second limiting surface 212 positioned above the first limiting surface 61. A spring 62 is provided between the swing member 60 and the connecting seat 21, with the upper end of the spring 62 abutting against the connecting seat 21 and the lower end abutting against the swing member 60. The spring 62 is located in front of the pivot 50. When the backrest main support 20 and the swing member 60 are not subjected to external force, the elastic stress applied by the spring 62 to the swing member 60 and the connecting seat 21 ensures that the first limiting surface 61 and the second limiting surface 212 are always in contact with each other. The rear end of the movable seat 40 is hinged to the bottom of the swing member 60, and the front end is hinged to the rear end of the seat cushion 30.

[0029] When the seat is in use, the user's buttocks rest on the seat cushion 30, and the back exerts a backward pushing force on the main backrest support 20, causing the main backrest support 20 to swing backward relative to the secondary backrest support 10. The connecting seat 21 swings backward around the pivot 50 along with the main backrest support 20. Because the second limiting surface 212 on the connecting seat 21 abuts against the first limiting surface 61 on the swing member 60, the main backrest support 20, while swinging backward relative to the secondary backrest support 10, pushes the swing member 60 to swing forward around the pivot 50. Due to the limiting effect of the limiting groove, the swing member 60 swings forward by a certain distance. With a small amplitude, it will push the movable seat 40 forward by a small displacement, and then push the seat cushion 30 forward by a small distance. When the user continues to apply a backward pushing force to the backrest main support 20, since the swing member 60 abuts against the front end of the limiting groove, the swing member 60 and the backrest sub-support 10 remain relatively fixed. The backrest main support 20 and the backrest sub-support 10 form a whole and swing backward relative to the chassis. The swing member 60 will pull the movable seat 40 to move backward, and then, while the user's back swings backward, the seat cushion 30 moves backward with the user's back. In this invention, the swinging component 60 is linked with the movable seat 40. When using the seat, the user's back presses against the main backrest support 20, causing the main backrest support 20 to swing backward at a small angle. Correspondingly, the seat cushion 30 moves forward by a small displacement, thus ensuring that the positional relationship between the seat cushion 30 and the main backrest support 20 meets the user's normal sitting posture. As the user continues to press against the main backrest support 20 and gradually leans back, the seat cushion 30 can move backward to follow the backward swinging angle of the main backrest support 20 and the secondary backrest support 10. This ensures that the distance between the support position for the user's buttocks and the support position for the user's back remains basically unchanged, providing better support for various parts of the user's body and improving the comfort of the seat.

[0030] In a preferred embodiment, the movable seat 40 is provided with a guide groove 41 extending from one side to the other. A laterally extending limiting rod 71 is fixed on the backrest sub-support 10. The limiting rod 71 passes through the guide groove 41 to support the movable seat 40. When the movable seat 40 moves back and forth, the limiting rod 71 can move back and forth relative to the movable seat 40 within the guide groove 41. The limiting rod 71 restricts the degree of freedom of the movable seat 40 to move up and down, thereby allowing the movable seat 40 to push and pull the seat cushion 30 in the front and back directions. For ease of installation, the limiting rod 71 can be a locking screw that passes through the guide groove 41. During assembly, the two parts of the locking screw are inserted into the guide groove 41 from both sides and tightened.

[0031] A support base 70 is fixedly connected to the backrest sub-support 10 and placed below the movable seat 40. The lower surface of the movable seat 40 is a flat surface 42, and the top surface of the support base 70 is an arc-shaped surface 72. The middle part of the arc-shaped surface 72 protrudes upward and abuts against the flat surface 42. The two ends of the limiting rod 71 are fixed to the support base 70 respectively. The arc-shaped surface 72 on the support base 70 supports the movable seat 40 and provides upward support to the movable seat 40, so as to reduce the downward pressure on the limiting rod 71 from the movable seat 40 and prevent the limiting rod 71 from deforming. In addition, the surface of the support base 70 that supports the movable seat 40 is an arc-shaped surface 72, which reduces the contact area between the movable seat 40 and the support base 70, thereby reducing the friction between them and ensuring that the movable seat 40 can move smoothly back and forth. The cross-section of the limiting rod 71 is set to be circular, so that the limiting rod 71 can move relative to the movable seat 40 within the guide groove 41, and can also rotate relative to the movable seat 40 within the guide groove 41. In other words, while using the limiting rod 71 to guide and limit the movable seat 40 up and down, it ensures that the movable seat 40 can swing around the limiting rod 71, so that the swinging member 60 can smoothly push and pull the movable seat 40 back and forth when it is hinged to the movable seat 40.

[0032] In this invention, a limiting seat 11 is fixedly connected to the front side of the backrest sub-support 10. The two sides of the limiting seat 11 are respectively fixed to the backrest sub-support 10 by screws. The middle part of the limiting seat 11 is a crossbeam structure placed on the front side of the backrest sub-support 10 and spaced a certain distance from it. Thus, the limiting seat 11 and the backrest sub-support 10 together form a limiting groove, and the swing member 60 is placed between the limiting seat 11 and the backrest sub-support 10, that is, the swing member 60 is inserted into the limiting groove. A spring 63 is provided between the swing member 60 and the limiting seat 11. The spring 63 applies a rearward elastic stress to the swing member 60. When the swing member 60 swings forward, the elastic stress of the spring 63 forms a damping force for the forward swing of the swing member 60, preventing the swing member 60 from rigidly colliding with the limiting seat 11. Furthermore, when the backrest main support 20 swings backward relative to the backrest sub-support 10 around the pivot 50, the spring 63 acts as a buffer. It should be noted that spring 63 can be replaced by other elastic components such as spring sheets or elastic rubber blocks.

[0033] In the above scheme, a support block 65 is fixed to the front side of the swing member 60, and the spring 62 is disposed between the support block 65 and the connecting seat 21, thereby positioning the spring 62 at the front side of the rotating shaft 50. A groove can be provided on the support block 65 to embed the spring 62, thus limiting its position. The spring 62 can be replaced by other elastic components such as a spring sheet or an elastic rubber block.

[0034] The top front side of the swing member 60 is an arc surface 64, and the first limiting surface 61 extends rearward from the rear of the arc surface 64. The bottom of the connecting seat 21 is provided with a rearwardly extending support plate 211, and the lower surface of the support plate 211 forms a second limiting surface 212. By setting the top front side of the swing member 60 as an arc surface 64, interference between the swing member 60 and the connecting seat 21 is avoided when the connecting seat 21 swings forward relative to the swing member 60. This allows the top surface of the swing member 60 to form a first limiting surface 61 that matches the second limiting surface 212, simplifying the structure of the swing member 60.

[0035] The seat of this utility model includes the above-mentioned linkage structure between the seat back and the seat cushion. Other structures of the seat are different from those of the prior art and will not be described in detail here.

[0036] 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 linkage structure between a seat back and a seat cushion, characterized in that, Includes chassis, backrest sub-support, backrest main support, seat cushion, and movable seat; The backrest sub-support is pivotally connected to the chassis so that the backrest sub-support can swing back and forth relative to the chassis. The bottom of the backrest main support is fixedly connected to the connecting seat located above the backrest sub-support. The backrest sub-support and the connecting seat are pivotally connected by a pivot shaft that passes through them. The backrest sub-support is provided with a front-to-back extending limiting groove. A swinging member is embedded in the limiting groove. The top of the swinging member is pivotally connected to the pivot shaft so that the swinging member can swing back and forth in the limiting groove. The top of the swing member forms a first limiting surface located behind the rotating shaft, and the bottom of the connecting seat is provided with a second limiting surface located behind the rotating shaft and above the first limiting surface. A first elastic member is provided between the swing member and the connecting seat. The first elastic member is used to apply elastic stress to the swing member and the connecting seat so that the first limiting surface and the second limiting surface abut against each other. The rear end of the movable seat is hinged to the bottom of the swinging component, and the front end is hinged to the seat cushion.

2. The linkage structure between the seat back and the seat cushion as described in claim 1, characterized in that, The movable seat is provided with a guide groove that extends from one side of the movable seat to the other side; a limiting rod that extends laterally and passes through the guide groove is fixed on the backrest sub-support.

3. The linkage structure between the seat back and the seat cushion as described in claim 2, characterized in that, The limit rod is a locking screw that passes through the guide groove.

4. The linkage structure between the seat back and the seat cushion as described in claim 2, characterized in that, A support base is fixedly connected to the backrest sub-bracket and placed below the movable seat. The lower surface of the movable seat is flat, and the top surface of the support base is an arc-shaped surface that abuts against the lower surface of the movable seat and convexes upward in the middle. The two ends of the limiting rod are fixed to the support base.

5. The linkage structure between the seat back and the seat cushion as described in claim 4, characterized in that, The cross-section of the limiting rod is set to be circular so that the limiting rod can slide relative to the movable seat in the length direction of the guide groove and rotate relative to the movable seat.

6. The linkage structure between the seat back and the seat cushion as described in claim 1, characterized in that, A limiting seat is fixedly connected to the front side of the backrest sub-support, and the limiting seat and the backrest sub-support together form a limiting groove.

7. The linkage structure between the seat back and the seat cushion as described in claim 6, characterized in that, A second elastic element is provided between the swinging component and the limiting seat.

8. The linkage structure between the seat back and the seat cushion as described in claim 1, characterized in that, A support block is fixed to the front side of the swing member, and the first elastic element is a spring located on the front side of the rotating shaft and clamped between the support block and the connecting seat.

9. The linkage structure between the seat back and the seat cushion as described in claim 1, characterized in that, The top front side of the swing component is an arc surface, the first limiting surface extends backward from the rear of the arc surface, and the bottom of the connecting seat is provided with a support plate that extends backward, the lower surface of the support plate forming the second limiting surface.

10. A seat, characterized in that, Includes the linkage structure of the seat back and seat cushion as described in any one of claims 1-9.

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