An adjustable width backrest assembly

Abstract

This utility model discloses an adjustable width backrest assembly. In the field of seat technology, it includes a backrest width adjustment unit, which comprises a synchronous gear. The synchronous gear has transmission racks at its top and bottom, and these racks mesh with the synchronous gear. An adjustment plate is fixedly mounted at the end of the transmission rack away from the synchronous gear. This adjustable width backrest assembly allows two backrest bodies to move simultaneously in opposite directions through the rotation of the synchronous gear, increasing the distance between them. The movement of the moving rod along the crossbar further propels the backrest bodies, facilitating a comfortable fit against the back. Rotation of the backrest switch moves the positioning plate, causing the locking teeth on the positioning plate to engage with the gear rail, preventing further movement of the backrest bodies. This design adapts to different user groups, optimizes the seat backrest adjustment structure, and enhances the user experience.

Description

Technical Field

[0001] This utility model relates to the field of seat technology, specifically to an adjustable width backrest assembly. Background Technology

[0002] The seat back is the support structure that a person leans on when sitting. Its main function is to provide lumbar support and relieve fatigue from prolonged sitting.

[0003] According to patent application number CN201921818555.1, this utility model discloses a backrest assembly, including a frame and a seat. The above technical solution facilitates the disassembly of the backrest, improving the driver's comfort. However, the backrest width cannot be adjusted during use, and the fit is achieved only by the soft part at the back of the backrest. This structure does not fit the back of people of different body types, resulting in a decrease in comfort and experience.

[0004] Further searching patent application number CN201921175891.9 reveals that this utility model relates to a backrest assembly. This utility model is composed of components such as a backrest, sliding block, baffle, sliding plate, locking plate, connecting plate, support plate, and locking plate. This structure can adapt to seat frames of different sizes, increasing the usability of the backrest. In addition, this structure can change the angle between the backrest and the seat cushion to suit different sitting postures of users. However, the width of the backrest cannot be adjusted during use; the fit is achieved only by the soft part at the back of the backrest. This structure does not fit the back of people with different body types, resulting in a decrease in comfort and experience. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides an adjustable width backrest assembly. The rotation of synchronous gears allows two backrest bodies to move simultaneously in opposite directions, increasing the distance between them. The upper part of the backrest body is longer to accommodate longer backs, while the lower part is wider to fit the waist or hips, making it suitable for different body types. Moving the movement rod along the crossbar further propels the backrest body, facilitating a close fit against the back. Rotation of the backrest switch moves the positioning plate, engaging the locking teeth with the gear rail to prevent further movement of the backrest body. This adapts to different body types, optimizes the seat backrest adjustment structure, improves user experience, and solves the problem of limited backrest width adjustment, where only the soft upper part of the backrest provides a fit. This design, however, does not provide a proper fit for different body types, resulting in decreased comfort and experience.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: an adjustable width backrest assembly, a backrest body, wherein the number of backrest bodies is even and symmetrically arranged.

[0007] The backrest width adjustment section includes a synchronous gear. Both the top and bottom of the synchronous gear are provided with transmission racks, which mesh with the synchronous gear. An adjustment plate is fixedly mounted on the end of the transmission rack away from the synchronous gear. A connector slot is provided on the surface of the end of the adjustment plate away from the transmission rack. A flexible connector is provided between the backrest body and the adjustment plate. One end of the flexible connector is fixedly connected to the backrest body, and the other end of the flexible connector has a locking groove that engages with the flexible connector. The locking assembly includes a rotating sleeve fixedly connected to a synchronous gear. Limiting protrusions are provided on both sides of the rotating sleeve, and a limiting groove is provided on the inner wall of the rotating sleeve. A round rod is provided inside the rotating sleeve, with protrusions on both sides that fit into the limiting grooves. A locking knob is provided at the end of the rotating sleeve away from the synchronous gear, with one end extending into the interior of the rotating sleeve. The inner wall of one end of the locking knob is folded and connected to the rotating sleeve.

[0008] The back-tracking assembly includes a moving rod, a crossbar inside the moving rod, the crossbar being slidably connected to the moving rod, a toothed rail embedded on one side of the crossbar, an annular mounting plate fixedly mounted on one side of the moving rod, a positioning plate inside the annular mounting plate, a back-tracking switch on one side of the positioning plate, and the back-tracking switch being protruding on the side near the positioning plate.

[0009] Preferably, a fixing plate is fixedly provided at one end of the moving rod near the synchronous gear, and the surface of the fixing plate is provided with holes.

[0010] Preferably, the fixing plate is in contact with the rotating sleeve and the limiting protrusion respectively, and one end of the round rod is provided with a threaded rod.

[0011] Preferably, one end of the threaded rod is threadedly connected to the inner wall of the locking knob.

[0012] Preferably, the positioning plate has a locking tooth on the side near the toothed rail, and the locking tooth engages with the toothed rail.

[0013] Preferably, the back-tracking switch is rotatably connected to the annular mounting plate, and the inner walls of the top and bottom ends of the annular mounting plate are provided with positioning grooves.

[0014] Preferably, the back-tracking switch is rotatably connected to the annular mounting plate, and the inner walls of the top and bottom of the annular mounting plate are provided with positioning grooves, and the top and bottom of the back-tracking switch are provided with elastic elements.

[0015] Preferably, a lifting ring is provided at the end of the crossbar away from the moving rod, and a tightening screw is provided on one side of the lifting ring.

[0016] Preferably, it also includes a column, which passes through the lifting ring and is slidably connected to the lifting ring.

[0017] Beneficial effects This invention provides an adjustable width backrest assembly. Compared with the prior art, it has the following advantages: 1. This adjustable width backrest assembly allows two backrest bodies to move simultaneously in opposite directions via the rotation of synchronous gears, increasing the distance between them. The upper part of the backrest body is longer to accommodate longer backs, while the lower part is wider to accommodate the waist or hips, making it suitable for different users. Moving the movement bar along the crossbar propels the backrest body to easily fit the back. Rotating the backrest switch moves the positioning plate, causing the locking teeth on the positioning plate to engage with the gear rail, preventing the backrest body from moving. This adapts to different users, optimizes the seat back adjustment structure, and improves the user experience.

[0018] 2. This adjustable width backrest assembly, through the combination of the threaded rod and the locking knob, can push the rotating sleeve to move, so that the rotating sleeve comes into contact with the fixed plate, and the limiting groove and protrusion at the rotating sleeve merge, which can prevent the round rod and the synchronous gear from rotating, and can lock the backrest body to a locked state, thus improving stability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a perspective view of the locking component and adjusting plate of this utility model; Figure 3 This is an exploded view of the locking component and adjusting plate of this utility model; Figure 4 This is an exploded view of the motion lever and the back-tracking switch of this utility model; Figure 5 This is a cross-sectional view of the synchronous gear and transmission rack of this utility model; Figure 6 This is a cross-sectional view of the locking component of this utility model; Figure 7 This is a top view of the locking component of this utility model; Figure 8 This is a cross-sectional view of the rotating sleeve of this utility model; Figure 9 This is an exploded view of the annular mounting plate and the back-mounted switch of this utility model.

[0020] In the diagram: 1. Backrest body; 2. Backrest width adjustment section; 201. Synchronous gear; 202. Transmission rack; 203. Adjustment plate; 204. Connector slot; 205. Flexible connector; 206. Snap-fit ​​groove; 3. Locking assembly; 301. Rotating sleeve; 302. Limiting protrusion; 303. Round rod; 304. Protrusion; 305. Locking knob; 306. Fixing plate; 307. Threaded rod; 308. Limiting groove; 4. Backrest tracking assembly; 401. Moving rod; 402. Crossbar; 403. Gear rail; 404. Annular mounting plate; 405. Positioning plate; 406. Backrest tracking switch; 407. Lifting ring; 408. Tightening screw; 5. Column. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-5 9. This utility model provides a technical solution: an adjustable width backrest assembly, including a backrest body 1, wherein the number of backrest bodies 1 is even and symmetrically arranged, the upper backrest body 1 is longer to fit a longer back, and the lower backrest bodies 1 are wider to fit the waist or hips.

[0023] The backrest width adjustment part 2 includes a synchronous gear 201. A transmission rack 202 is provided at both the top and bottom of the synchronous gear 201, and the transmission rack 202 meshes with the synchronous gear 201. An adjustment plate 203 is fixedly provided at the end of the transmission rack 202 away from the synchronous gear 201. A connector slot 204 is provided on the surface of the end of the adjustment plate 203 away from the transmission rack 202. A flexible connector 205 is provided between the backrest body 1 and the adjustment plate 203. One end of the flexible connector 205 is fixedly connected to the backrest body 1, and the other end of the flexible connector 205 has a locking groove 206 that engages with the flexible connector 205.

[0024] The chasing assembly 4 includes a moving rod 401, a crossbar 402 inside the moving rod 401, the crossbar 402 being slidably connected to the moving rod 401, a toothed rail 403 embedded on one side of the crossbar 402, an annular mounting plate 404 fixedly mounted on one side of the moving rod 401, a positioning plate 405 inside the annular mounting plate 404, a chasing switch 406 on one side of the positioning plate 405, and the chasing switch 406 being protruding on the side near the positioning plate 405.

[0025] The positioning plate 405 has a locking tooth on the side near the gear rail 403, and the locking tooth engages with the gear rail 403. The back-tracking switch 406 is rotatably connected to the annular mounting plate 404. The inner walls of the top and bottom of the annular mounting plate 404 are provided with positioning grooves. The back-tracking switch 406 is rotatably connected to the annular mounting plate 404. The inner walls of the top and bottom of the annular mounting plate 404 are provided with positioning grooves. The top and bottom of the back-tracking switch 406 are provided with elastic elements. When the moving rod 401 moves, it can move along the crossbar. When 402 moves, it can move horizontally, pushing the backrest body 1 to move and changing its position. After the position change is completed, the backrest switch 406 is rotated in the opposite direction, causing the elastic element at the backrest switch 406 to merge with the positioning groove, which can improve the stability of the backrest switch 406. The rotation of the backrest switch 406 can push the positioning plate 405 to move, causing the locking teeth at the positioning plate 405 to engage with the toothed rail 403, which can prevent the moving rod 401 from moving and extending.

[0026] A lifting ring 407 is provided at the end of the crossbar 402 away from the moving rod 401. A tightening screw 408 is provided on one side of the lifting ring 407. It also includes a column 5, which passes through the lifting ring 407 and is slidably connected to the lifting ring 407. When the lifting ring 407 moves upward, it can move upward along the column 5, which in turn drives the backrest body 1, the back width adjustment part 2, the locking component 3 and the backrest tracking component 4 to move upward at the same time, raising the position of the backrest body 1. After the raising is completed, tightening the screw 408 again will allow one end of it to enter the interior of the column 5, preventing the lifting ring 407 from moving downward and improving stability.

[0027] Please see Figure 1 and 6-8, the locking component 3 includes a rotating sleeve 301, which is fixedly connected to the synchronous gear 201. Limiting protrusions 302 are provided on both sides of the rotating sleeve 301, and a limiting groove 308 is provided on the inner wall of the rotating sleeve 301. A round rod 303 is provided inside the rotating sleeve 301, and protrusions 304 are provided on both sides of the round rod 303. The protrusions 304 are adapted to the limiting grooves 308. A lock is provided at the end of the rotating sleeve 301 away from the synchronous gear 201. A locking knob 305 is provided, one end of which extends into the interior of the rotating sleeve 301. The inner wall of one end of the locking knob 305 is folded and connected to the rotating sleeve 301. A fixing plate 306 is fixedly provided at one end of the moving rod 401 near the synchronous gear 201. The surface of the fixing plate 306 is provided with holes. The fixing plate 306 contacts the rotating sleeve 301 and the limiting protrusion 302 respectively. A threaded rod 307 is provided at one end of the round rod 303. One end of the threaded rod 307 is threadedly connected to the inner wall of the locking knob 305.

[0028] When adjusting the back, first rotate the locking knob 305. Since the locking knob 305 is threadedly connected to the threaded rod 307, the rotating locking knob 305 can be moved through the threaded rod 307, causing the locking knob 305 to gradually separate from the threaded rod 307. During the movement of the locking knob 305, because the inner wall of one end of the locking knob 305 is folded and connected to the rotating sleeve 301, the rotating sleeve 301 can be moved simultaneously through one end of the locking knob 305, causing the rotating sleeve 301 and the limiting protrusion 302 to gradually separate from the fixing plate 306, and at the same time, the limiting groove 308 on the inner wall of the rotating sleeve 301 also separates from the protrusion 304, achieving the unlocked state. Similarly, when the locking knob 305 is tightened, the locking state is achieved. To facilitate subsequent operations, the two adjusting plates 203 are moved, and the transmission racks 202, which are fixedly connected to the adjusting plates 203, move simultaneously. During the movement of the transmission racks 202, since the transmission racks 202 mesh with the synchronous gears 201, the movement of one transmission rack 202 causes the gear to rotate, and simultaneously causes the other transmission rack 202 to move. This results in the two transmission racks moving in opposite directions, thus simultaneously increasing the distance between the two adjusting plates 203. At this time, the adjusting plates 203 and the flexible connectors 205 are connected together through the connector slots 204 and 206, allowing the flexible connectors 205 to move simultaneously when the adjusting plates 203 move. This movement causes the backrest body 1 to move, increasing the distance between the two backrest bodies 1 to accommodate different users. When the backrest body 1 needs to be raised or lowered, the tightening screw 408 is first rotated to facilitate the upward movement of the lifting ring 407. The lifting ring 407 then moves upward along the upright 5, simultaneously raising the backrest body 1, the back width adjustment part 2, the locking assembly 3, and the backrest-following assembly 4. After raising the backrest body 1, tightening the screw 408 again allows one end to enter the interior of the upright 5, preventing the lifting ring 407 from moving downward and improving stability. Then, the backrest-following switch 406 is rotated, causing the protruding part of the backrest-following switch 406 to engage with the fixed position. The position plate 405 separates, and the rotation of the backrest switch 406 separates the elastic element from the positioning groove. After separation, the movement rod 401 moves along the crossbar 402, allowing horizontal movement and pushing the backrest body 1 to move, thus changing the position of the backrest body 1. After the position change is complete, the backrest switch 406 is rotated in the opposite direction, causing the elastic element at the backrest switch 406 to merge with the positioning groove, improving the stability of the backrest switch 406. The rotation of the backrest switch 406 also pushes the positioning plate 405 to move, causing the locking teeth at the positioning plate 405 to engage with the toothed rail 403, preventing the movement rod 401 from moving and extending.

[0029] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

Claims

1. An adjustable width backrest assembly, characterized in that: include; The number of backrest bodies is even and they are arranged symmetrically. The backrest width adjustment part includes a synchronous gear. The synchronous gear has a transmission rack at both its top and bottom, and the transmission rack meshes with the synchronous gear. An adjustment plate is fixedly provided at the end of the transmission rack away from the synchronous gear. A connector slot is provided on the surface of the end of the adjustment plate away from the transmission rack. A flexible connector is provided between the backrest body and the adjustment plate. One end of the flexible connector is fixedly connected to the backrest body, and the other end of the flexible connector has a snap-fit ​​groove on its surface, which snaps into the flexible connector. A locking assembly includes a rotating sleeve fixedly connected to a synchronous gear. Limiting protrusions are provided on both sides of the rotating sleeve, and a limiting groove is provided on the inner wall of the rotating sleeve. A round rod is provided inside the rotating sleeve, with protrusions on both sides of the round rod that fit into the limiting groove. A locking knob is provided at the end of the rotating sleeve away from the synchronous gear, with one end of the locking knob extending into the interior of the rotating sleeve. The inner wall of one end of the locking knob is folded and connected to the rotating sleeve. The back-tracking assembly includes a moving rod, a crossbar inside the moving rod, the crossbar being slidably connected to the moving rod, a toothed rail embedded on one side of the crossbar, an annular mounting plate fixedly mounted on one side of the moving rod, a positioning plate inside the annular mounting plate, a back-tracking switch on one side of the positioning plate, and the back-tracking switch being protruding on the side near the positioning plate.

2. The adjustable width backrest assembly according to claim 1, characterized in that: A fixing plate is fixedly installed at one end of the moving rod near the synchronous gear, and the surface of the fixing plate is provided with holes.

3. The adjustable width backrest assembly according to claim 2, characterized in that: The fixing plate is in contact with the rotating sleeve and the limiting protrusion respectively, and one end of the round rod is provided with a threaded rod.

4. An adjustable width backrest assembly according to claim 3, characterized in that: One end of the threaded rod is threadedly connected to the inner wall of the locking knob.

5. An adjustable width backrest assembly according to claim 1, characterized in that: The positioning plate has a locking tooth on the side near the toothed rail, and the locking tooth engages with the toothed rail.

6. An adjustable width backrest assembly according to claim 1, characterized in that: The back-tracking switch is rotatably connected to the annular mounting plate. The inner walls of the top and bottom of the annular mounting plate are provided with positioning grooves, and the top and bottom of the back-tracking switch are provided with elastic elements.

7. An adjustable width backrest assembly according to claim 1, characterized in that: A lifting ring is provided at the end of the crossbar away from the moving rod, and a tightening screw is provided on one side of the lifting ring.

8. An adjustable width backrest assembly according to claim 7, characterized in that: It also includes a column that passes through the lifting ring and is slidably connected to the lifting ring.

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