Backrest assembly and seat

Abstract

This utility model discloses a backrest assembly and a seat. The backrest assembly includes a fixed bracket, a movable bracket, a backrest, a swing rod, a connecting bracket, and a gas spring. The fixed bracket is installed on the seat base or cushion, and the movable bracket is installed on the fixed bracket in a height-adjustable manner. A connecting block is connected to the backrest. The swing rod is located between the backrest and the movable bracket, with its two ends hinged to the movable bracket and the connecting block, respectively. The two ends of the connecting bracket are also hinged to the movable bracket and the connecting block, respectively. The connecting block, the swing rod, the movable bracket, and the connecting bracket together form a parallel four-bar linkage. The cylinder of the gas spring is hinged to the movable bracket, and a connecting seat hinged to the swing rod is connected to the piston rod of the gas spring. A control button is provided on the piston rod of the gas spring, and an actuating element is provided on the connecting seat. This utility model ensures that the backrest provides constant support angle for the user's back and allows for precise adjustment of the backrest's fore-and-aft position.

Description

Technical Field

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

[0002] Traditional chair backrests are not adjustable, keeping the user's back in a fixed position for extended periods. This makes it difficult to adapt to different sitting postures and can easily lead to fatigue. Some existing office chairs and gaming chairs typically feature adjustable backrests, allowing users to change their sitting position as needed. However, these chairs usually have the backrest mounted rotatably on the base or cushion, meaning the backrest can only swing back and forth and cannot change its forward or backward position. This results in inadequate support for the user's back in both forward and backward positions, leading to poor chair comfort. Utility Model Content

[0003] The purpose of this utility model is to provide a backrest assembly and a seat that can realize the forward and backward translational adjustment of the seat backrest, enabling the seat backrest to achieve a back-following function, thereby improving comfort.

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

[0005] Backrest assembly, including fixed bracket, movable bracket, backrest, swing arm, connecting bracket, and gas spring;

[0006] The fixed bracket is installed on the base or cushion of the seat, and the movable bracket is installed on the fixed bracket in an adjustable manner; a connecting block is connected to the backrest; the swing rod is placed between the backrest and the movable bracket, and its two ends are respectively hinged to the movable bracket and the connecting block, and the two ends of the connecting bracket are respectively hinged to the movable bracket and the connecting block. The connecting block, the swing rod, the movable bracket and the connecting bracket together form a parallel four-bar linkage.

[0007] The cylinder of the pneumatic rod is hinged to the movable bracket. A connecting seat that is hinged to the swing arm is connected to the piston rod of the pneumatic rod. A control button is provided on the piston rod of the pneumatic rod. When the control button is pressed, the piston rod of the pneumatic rod can move relative to the cylinder. When the control button is released, the piston rod of the pneumatic rod is fixed relative to the cylinder. An actuating element is provided on the connecting seat. A control component is provided on the backrest to drive the actuating element to move relative to the connecting seat, so that the actuating element presses or releases the control button.

[0008] Preferably, the control component includes a lever mounted on the backrest and a connecting rope, one end of which is connected to the lever and the other end of which is connected to the actuating element.

[0009] Preferably, the backrest includes an outer frame and a flexible support connected to the front side of the outer frame. The control component includes a mounting base fixed to the outer frame and a movable component embedded in the mounting base. The movable component protrudes from the rear side of the outer frame. A lever is located on the rear side of the outer frame and is fixedly connected to the movable component. One end of a connecting rope is connected to the movable component. A guide sleeve is provided on the outside of the connecting rope. One end of the guide sleeve is fixed to the mounting base and the other end is fixed to the connecting base.

[0010] Preferably, the backrest includes an outer frame and a flexible support part connected to the front side of the outer frame. The bottom of the outer frame is provided with a mounting groove, and the connecting block is embedded in the mounting groove and detachably fixed to the outer frame.

[0011] Preferably, the connecting block is provided with a clearance groove, which is used to accommodate at least a portion of the swing arm when the backrest is moved to the position closest to the movable support.

[0012] Preferably, the lower end of the swing rod is embedded in the bottom of the clearance groove, and the swing rod and the connecting block are hinged together by a first pivot that passes through them; the bottom of the connecting bracket is embedded in the top of the clearance groove, and the connecting bracket and the connecting block are hinged together by a second pivot that passes through them.

[0013] Preferably, the movable bracket includes a vertical part that is slidably mounted on a fixed bracket, two connecting parts that extend obliquely upwards to both sides from the top of the vertical part, the top two sides of the connecting bracket being hinged to the top of the two connecting parts, and the bottom of the connecting bracket being hinged to the connecting block.

[0014] Preferably, a fixed base is detachably fixed on the movable bracket. The fixed base is provided with a first connecting ear and a second connecting ear located below the first connecting ear. The upper end of the swing rod is hinged to the first connecting ear, the cylinder of the pneumatic rod is hinged to the second connecting ear, and a recess for accommodating the pneumatic rod is provided on the rear side of the swing rod.

[0015] Preferably, the front side of the fixed bracket forms a support surface, and the rear side of the connecting block is detachably fixed with a support pad that mates with the support surface. The support pad is provided with a support protrusion protruding towards the support surface.

[0016] Seat, including the aforementioned backrest assembly.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] In this invention, a parallel four-bar linkage is formed by a connecting block, a swing rod, a movable bracket, and a connecting bracket. The backrest is installed on the connecting block, and the swing rod is driven by a pneumatic rod to swing back and forth, which causes the connecting block to move back and forth, and in turn, the backrest to move back and forth. When adjusting the backrest back and forth, the support angle of the backrest for the user's back remains unchanged, realizing the backrest's back-to-back tracking function. It can also precisely adjust the backrest's back and forth position to meet different user sitting depth requirements, thus improving the comfort of the seat. Attached Figure Description

[0019] Figure 1 This is an installation diagram of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the usage state of this utility model;

[0022] Figure 4 for Figure 1 Schematic diagram of the structure of the medium-pressure bar;

[0023] Figure 5 for Figure 1 A schematic diagram of the structure of the control component;

[0024] Figure 6 This is a schematic diagram of the installation of the backrest and connecting block of this utility model.

[0025] The components are as follows: 10. Fixed bracket; 20. Movable bracket; 21. Vertical part; 22. Connecting part; 23. Fixed seat; 231. First connecting ear; 232. Second connecting ear; 30. Backrest; 31. Mounting groove; 40. Swing rod; 50. Connecting bracket; 60. Pneumatic rod; 61. Cylinder body; 62. Piston rod; 63. Connecting seat; 64. Control button; 65. Actuating component; 70. Connecting block; 71. Support pad; 72. Clearance groove; 73. Support protrusion; 80. Control component; 81. Movable part; 82. Connecting rope; 83. Base; 84. Cover plate; 85. Actuating block; 86. Guide sleeve. 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 , 2As shown in Figures 3, 4, and 5, this utility model provides a backrest assembly, which includes a fixed bracket 10, a movable bracket 20, a backrest 30, a swing rod 40, a connecting bracket 50, and a gas spring 60. The fixed bracket 10 is fixedly connected to the seat base or cushion, serving as the mounting base for the entire backrest assembly. The movable bracket 20 is mounted on the fixed bracket 10 in an adjustable manner. A connecting block 70 is connected to the backrest 30. The swing rod 40 is positioned between the backrest 30 and the movable bracket 20. The upper end of the swing rod 40 is hinged to the movable bracket 20, and the lower end is hinged to the connecting block 70. The upper end of the connecting bracket 50 is hinged to the movable bracket 20, and the lower end is hinged to the connecting block 70. The connecting block 70, the swing rod 40, the movable bracket 20, and the connecting bracket 50 together form a parallel four-bar linkage. The cylinder 61 of the pneumatic rod 60 is hinged to the movable bracket 20. A connecting seat 63 is connected to the piston rod 62 of the pneumatic rod 60, and the connecting seat 63 is hinged to the swing rod 40, thereby making the piston rod 62 of the pneumatic rod 60 and the swing rod 40 hinged together. A control button 64 is provided on the piston rod 62 of the pneumatic rod 60. The control button 64 is used to control the pneumatic rod 60. When the control button 64 is pressed, the pneumatic rod 60 is in a telescopic state, that is, the piston rod 62 can move relative to the cylinder 61. The pneumatic rod 60 forms an elastic support between the movable bracket 20 and the swing rod 40. When the control button 64 is released, the pneumatic rod 60 is in a fixed state, that is, the piston rod 62 and the cylinder 61 are fixed. The pneumatic rod 60 forms a rigid support between the movable bracket 20 and the swing rod 40. A toggle member 65 is provided on the connecting base 63. The toggle member 65 is used to press or release the control button 64. A control component 80 is provided on the backrest 30 to drive the toggle member 65 to move relative to the connecting base 63. When the control component 80 is operated, it drives the toggle member 65 to move so that the toggle member 65 presses or releases the control button 64.

[0030] The backrest 30 supports the user's back. When the user's sitting posture is too far forward and needs to adjust backward, the control component 80 can be operated. The user's back presses backward against the backrest 30, which pushes the connecting block 70 backward. The swing rod 40 swings backward, causing the piston rod 62 to retract into the cylinder 61. Once the backrest 30 has moved to the desired position, the operation of the control component 80 is stopped, and the piston rod 62 forms a rigid support, keeping the position of the backrest 30 fixed. When the user's sitting posture is too far back and needs to adjust forward, the control component 80 can be operated. The user's back moves forward, and the pneumatic rod 60 pushes the swing rod 40 forward, causing it to swing forward and push the backrest 30 forward until it reaches the desired position. Once the backrest 30 has moved forward, the operation of the control component 80 is stopped, and the piston rod 62 forms a rigid support, keeping the position of the backrest 30 fixed. In this invention, a parallel four-bar linkage is formed by connecting block 70, swing rod 40, movable bracket 20, and connecting bracket 50. The backrest 30 is installed on the connecting block 70. The swing rod 40 is driven by the pneumatic rod 60 to swing back and forth, which causes the connecting block 70 to move back and forth, and then the backrest 30 to move back and forth. When adjusting the backrest 30 back and forth, the support angle of the backrest 30 for the user's back remains unchanged, realizing the backrest 30's back-to-back tracking function. It can also precisely adjust the backrest 30's back and forth position to meet the user's different sitting depth requirements and improve the comfort of the seat.

[0031] The control component 80 includes a toggle block 85 and a connecting rope 82. The toggle block 85 is mounted on the backrest 30. One end of the connecting rope 82 is connected to the toggle block 85 and the other end is connected to the actuating element 65. When the toggle block 85 is moved, the connecting rope 82 pulls the actuating element 65, causing the actuating element 65 to move, thereby pressing the control button 64. For ease of installation, the backrest 30 includes an outer frame and a flexible support connected to the front of the outer frame. The control assembly 80 also includes a mounting base and a movable component 81. The mounting base is fixed to the outer frame, and the movable component 81 is movably embedded in the mounting base. After the mounting base is fixed to the outer frame of the backrest 30, a portion of the movable component 81 protrudes from the rear side of the outer frame. A lever 85 is located on the rear side of the outer frame and is fixed to the movable component 81 with screws. One end of the connecting rope 82 extends into the mounting base and connects to the movable component 81. A guide sleeve 86 is sleeved on the outside of the connecting rope 82. One end of the guide sleeve 86 is fixedly connected to the mounting base, and the other end is fixedly connected to the connecting seat 63 to protect and guide the connecting rope 82. To facilitate the installation of the movable component 81 inside the mounting base, the mounting base is a split structure, including a base 83 and a cover plate 84. The movable component 81 is embedded in the groove of the base 83, and then the cover plate 84 is fixed to the base 83 with screws.

[0032] In this utility model, the connecting block 70 can be detachably fixed to the outer frame of the backrest 30. Specifically, an installation groove 31 is provided at the bottom of the outer frame. The connecting block 70 is embedded in the installation groove 31 and detachably fixed to the outer frame of the backrest 30 by bolts. The connecting block 70 can also be fixed to the outer frame of the backrest 30 by other detachable connection methods to facilitate the installation of the backrest 30 and the connecting block 70. Embedding the connecting block 70 in the installation groove 31 of the backrest 30 reduces the space occupied by the connecting block 70 in the front-back direction, making the structure of the entire backrest assembly more compact. A clearance groove 72 is provided on the connecting block 70 to allow the swing arm 40 to pass. When the backrest 30 moves to the position closest to the movable bracket 20, that is, when the backrest 30 moves to the rearmost position, a portion of the swing arm 40 is accommodated inside the clearance groove 72. This avoids interference between the swing arm 40 and the connecting block 70, increases the range of forward and backward movement of the backrest 30, and gives the backrest 30 a larger forward and backward adjustable stroke. In addition, the lower end of the swing arm 40 is embedded in the bottom of the clearance groove 72, and the swing arm 40 and the connecting block 70 are hinged together by a first pivot that passes through them. The bottom of the connecting bracket 50 is embedded in the top of the clearance groove 72, and the connecting bracket 50 and the connecting block 70 are hinged together by a second pivot that passes through them.

[0033] To further provide stable support for the user's back, the movable support 20 is configured in a Y-shape, including a vertical part 21 that slides on the fixed support 10, and two connecting parts 22 that extend upwards and to the sides from the top of the vertical part 21. The connecting support 50 is configured in a U-shape, with its top two sides hinged to the tops of the two connecting parts 22, and its bottom hinged to the connecting block 70. Thus, the two sides of the connecting support 50 are hinged to the two sides of the movable support 20, making the connection between the connecting support 50 and the movable support 20 more stable, and enabling the parallel four-bar linkage to provide more stable support for the backrest 30.

[0034] A fixed seat 23 is provided on the movable bracket 20. The fixed seat 23 is fixed to the movable bracket 20 by bolts or other detachable connection. The fixed seat 23 is provided with a first connecting ear 231 and a second connecting ear 232 located below the first connecting ear 231. The first connecting ear 231 and the second connecting ear 232 are staggered by a certain distance. The upper end of the swing rod 40 is hinged to the first connecting ear 231, and the cylinder 61 of the pneumatic rod 60 is hinged to the second connecting ear 232, so that the swing rod 40 is located above the pneumatic rod 60, avoiding interference between the pneumatic rod 60 and the swing rod 40. A recess is provided on the rear side of the swing rod 40 to accommodate the pneumatic rod 60. Specifically, when the backrest 30 is moved to the rearmost position, the pneumatic rod 60 is placed in the recess of the swing rod 40, so that the backrest 30 is as close to the fixed bracket 10 as possible, increasing the travel of the backrest 30's forward and backward adjustment.

[0035] The front side of the fixed bracket 10 forms a support surface. The rear side of the connecting block 70 is detachably fixed with a support pad 71 that mates with the support surface. The support pad 71 is provided with a support protrusion 73 protruding towards the support surface. When the backrest 30 moves to the rearmost position, the support protrusion 73 abuts against the support surface of the fixed bracket 10, reducing the wear between the connecting block 70 and the fixed bracket 10. Since the support protrusion 73 reduces the contact area between the connecting block 70 and the fixed bracket 10, when the height of the movable bracket 20 is adjusted up and down relative to the fixed bracket 10, the smaller contact area results in less friction between the connecting block 70 and the fixed bracket 10, thus facilitating the adjustment of the height of the backrest 30. When the support protrusion 73 is severely worn, the support pad 71 can be removed and replaced with a new support pad 71.

[0036] The seat of this utility model includes the backrest assembly described above. The other structures of the seat are the same as those in the prior art and will not be described in detail here.

[0037] 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 backrest assembly characterised in that, Includes fixed bracket, movable bracket, backrest, swing arm, connecting bracket, and pneumatic rod; The fixed bracket is installed on the base or cushion of the seat, and the movable bracket is installed on the fixed bracket in an adjustable manner; a connecting block is connected to the backrest; the swing rod is placed between the backrest and the movable bracket, and its two ends are respectively hinged to the movable bracket and the connecting block, and the two ends of the connecting bracket are respectively hinged to the movable bracket and the connecting block. The connecting block, the swing rod, the movable bracket and the connecting bracket together form a parallel four-bar linkage. The cylinder of the pneumatic rod is hinged to the movable bracket. A connecting seat that is hinged to the swing arm is connected to the piston rod of the pneumatic rod. A control button is provided on the piston rod of the pneumatic rod. When the control button is pressed, the piston rod of the pneumatic rod can move relative to the cylinder. When the control button is released, the piston rod of the pneumatic rod is fixed relative to the cylinder. An actuating element is provided on the connecting seat. A control component is provided on the backrest to drive the actuating element to move relative to the connecting seat, so that the actuating element presses or releases the control button.

2. The backrest assembly of claim 1, wherein, The control components include a lever mounted on the backrest and a connecting rope, one end of which is connected to the lever and the other end of which is connected to the actuating element.

3. The backrest assembly of claim 2, wherein, The backrest includes an outer frame and a flexible support connected to the front side of the outer frame. The control component includes a mounting base fixed to the outer frame and a movable component embedded in the mounting base. The movable component protrudes from the rear side of the outer frame. A lever is located on the rear side of the outer frame and is fixedly connected to the movable component. One end of a connecting rope is connected to the movable component. A guide sleeve is sleeved on the outside of the connecting rope. One end of the guide sleeve is fixed to the mounting base and the other end is fixed to the connecting base.

4. The backrest assembly of claim 1, wherein, The backrest includes an outer frame and a flexible support part connected to the front side of the outer frame. A mounting groove is provided at the bottom of the outer frame, and a connecting block is embedded in the mounting groove and detachably fixed to the outer frame.

5. The backrest assembly of claim 4, wherein, The connecting block is provided with a clearance groove, which is used to accommodate at least a portion of the swing arm when the backrest is moved to the position closest to the movable support.

6. The backrest assembly of claim 5, wherein, The lower end of the swing rod is embedded in the bottom of the clearance groove, and the swing rod and the connecting block are hinged together by a first pivot that runs through them; the bottom of the connecting bracket is embedded in the top of the clearance groove, and the connecting bracket and the connecting block are hinged together by a second pivot that runs through them.

7. The backrest assembly of claim 1, wherein, The movable support includes a vertical part that slides on a fixed support, two connecting parts that extend upwards and to the sides from the top of the vertical part, the top two sides of the connecting support are respectively hinged to the top of the two connecting parts, and the bottom of the connecting support is hinged to the connecting block.

8. The backrest assembly of claim 1, wherein, A fixed base is detachably fixed on the movable bracket. The fixed base is provided with a first connecting ear and a second connecting ear located below the first connecting ear. The upper end of the swing rod is hinged to the first connecting ear, the cylinder of the pneumatic rod is hinged to the second connecting ear, and a recess for accommodating the pneumatic rod is provided on the rear side of the swing rod.

9. The backrest assembly of claim 1, wherein, The front side of the fixed bracket forms a support surface, and the rear side of the connecting block is detachably fixed with a support pad that mates with the support surface. The support pad is provided with a support protrusion protruding towards the support surface.

10. A seat, characterized by Includes the backrest assembly as described in any one of claims 1-9.

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