Seat chassis termination angle adjusting device

Abstract

The utility model discloses a seat chassis termination angle adjusting device which comprises a base and a bottom plate, the two ends of the base are hinged to a warped plate and a connecting plate respectively, the base and the bottom plate form a four-bar mechanism, the connecting plate rotates and can abut against the end of the base, a gear block is arranged on the connecting plate in a sliding mode, and the gear block is connected with the warped plate. The inner end of the gear block can slide to the position between the connecting plate and the end of the base to enable the end of the base to abut against the gear block so as to control the stopping angle of rotation of the connecting plate. According to the scheme, a user is prevented from turning over too much once, and the use safety of the seat is greatly improved; and the adjusting range of the seat chassis can be controlled more detailedly to a certain extent, and the operation convenience of a user is improved.

Description

Technical Field

[0001] This utility model relates to the field of seat chassis, and in particular to a seat chassis termination angle adjustment device. Background Technology

[0002] Most chairs on the market have their backrests fixed to the chassis, and the compression force of the chassis springs is adjusted through operation, thereby allowing for adjustments to the seat height and backrest tilt. The backrest and seat are adjusted in tandem via the chassis. However, the existing chair chassis have a fixed endpoint angle for each adjustment, meaning the maximum seat height and backrest tilt angle are fixed each time. If a user leans back against the backrest to adjust the backrest tilt angle and seat height, it's easy to press the chair chassis directly to the fixed endpoint angle, making chair chassis adjustment difficult for users.

[0003] For example, Chinese Patent Publication No. CN219047862U, published on May 23, 2023, entitled "A Seat Chassis," includes a backrest fixing frame, a base, a movable plate, a main spring, and an adjustment handle. The backrest fixing frame fixes the backrest, and the main spring is located below the base. The main spring controls the tilting force of the backrest fixing frame and causes the backrest to return to its original position. It also includes a hinge frame, the upper end of which abuts against the bottom surface of the movable plate. The hinge frame moves downward relative to the base and drives the movable plate to rotate at a certain angle relative to the base, while compressing the main spring. When the backrest is installed on the backrest fixing frame, the backrest can follow the movement of the backrest by swaying left and right and up and down, closely adhering to the backrest, providing support for various sitting postures and improving the comfort of the chair.

[0004] The drawback of the existing patent is that the termination angle of the existing seat chassis is fixed each time it is adjusted. That is, the maximum height of the seat and the tilt angle of the backrest are fixed each time it is adjusted. If the user uses his body to lean back against the backrest to adjust the tilt angle of the backrest and the height of the seat, it is easy to directly press the seat chassis to the fixed termination angle, which makes it difficult for the user to adjust the seat chassis. Utility Model Content

[0005] The purpose of this invention is to solve the problem that the termination angle of the existing seat chassis is fixed each time it is adjusted, that is, the maximum height of the seat and the backward tilt angle of the backrest are fixed each time the seat is adjusted. The invention provides a seat chassis termination angle adjustment device that can control the termination angle of the seat chassis each time it is adjusted.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A seat chassis termination angle adjustment device includes a base and a base plate. A rocker arm and a connecting plate are hinged to both ends of the base, forming a four-bar linkage with the base plate. The connecting plate rotates and rests against the end of the base. A stop block is slidably mounted on the connecting plate, with its inner end sliding between the connecting plate and the end of the base, causing the end of the base to rest against the stop block, thereby controlling the termination angle of the connecting plate's rotation. This seat chassis termination angle adjustment device controls the termination angle of the seat chassis with the stop block. Specifically, the termination angle of the seat chassis changes each time the user adjusts the seat height and backrest tilt. Before each adjustment, the termination angle of the seat chassis is pre-adjusted by sliding the stop block. Even if the user suddenly leans back forcefully, the seat will not reach the maximum height of the entire seat chassis or the maximum tilt of the backrest, preventing excessive backward tilting and greatly improving the safety of seat use. Furthermore, it allows for more detailed control over the adjustment range of the seat chassis, improving user convenience.

[0008] The termination angle of the seat chassis described in this technical solution is not the maximum height of the overall seat and the maximum tilt of the backrest, but rather the maximum height of the seat and the maximum tilt of the backrest that the user can achieve in a single adjustment. This technical solution slides a stop block between the end of the base and the connecting plate, with the end of the base abutting against the stop block. This controls the termination angle of the connecting plate's rotation, thereby fixing the maximum height of the seat and the tilt angle of the backrest during each adjustment. However, the stop block does not affect the overall fixation of the maximum height of the seat and the tilt angle of the backrest on the seat chassis.

[0009] Preferably, the connecting plate is provided with a gear shift groove that mates with the gear shift block, and part of the gear shift groove mates with the end of the base. The gear shift block is slidably disposed on the gear shift groove, and the gear shift groove is provided with a sliding position that mates with the gear shift block, so that the gear shift block can slide and stay on the gear shift groove.

[0010] Preferably, the shift block includes an abutment portion located inside the connecting plate and a toggle portion located outside the connecting plate. The toggle portion moves the abutment portion between the connecting plate and the end of the base so that the end of the base can abut against the abutment portion. The abutment portion and the toggle portion are located on the inner and outer sides of the connecting plate and connected to each other. When the user needs to adjust the end angle of the seat chassis to the maximum angle of the entire seat chassis, it is not necessary to slide the inner end of the shift block between the end of the base and the connecting plate; when it is necessary to adjust the end angle of the seat chassis, sliding the inner end of the shift block between the end of the base and the connecting plate can control the end angle of each adjustment of the seat chassis.

[0011] Preferably, the gear block further includes an elastic locking part, which is located between the abutting part and the toggle part, and the elastic locking part is slidably disposed in the gear slot.

[0012] Preferably, the inner wall of the gear shift groove is provided with at least two sets of gear shift grooves, which cooperate with the elastic locking part, and at least one gear shift groove cooperates with the end of the base. The elastic locking part is elastically engaged with the gear shift groove, and the elastic locking part can slide and switch between different gear shift grooves to move the gear block to different gears of the connecting plate.

[0013] Preferably, the shift block has a limiting protrusion, and the end of the base has a limiting groove that mates with the limiting protrusion. The limiting protrusion and the limiting groove engage, and rotating the connecting plate causes the end of the base to abut against the shift block. Simultaneously, the engagement of the limiting protrusion and the limiting groove prevents the shift block from moving after each adjustment of the seat height and backrest tilt by the user, further limiting the position of the shift block.

[0014] Preferably, the number of positions on the upper limit protrusion of the gear shift block is one less than the number of positions in the gear shift groove. The extra position in the gear shift groove is the position when the gear shift block does not need to mate with the end of the base.

[0015] Preferably, the base includes a base body and support plates disposed on both sides of the base body. The connecting plate rotates and abuts against the ends of the support plates. When the stop block slides between the ends of the connecting plate and the support plates, the ends of the support plates abut against both sides of the stop block. The base is supported against the inner ends of the connecting plate or the stop block by the support plates on both sides of the base body, resulting in a more stable structure.

[0016] Preferably, the stop blocks are distributed along the axial direction of the hinge joint between the base and the connecting plate.

[0017] Preferably, the side of the shift block facing the base end is inclined, and the thickness of the lower end of the shift block is less than the thickness of the upper end of the shift block. This allows the inner end of the shift block to continuously slide between the connecting plate and the base end, causing the base end to abut against the shift block, thereby controlling different termination angles of the connecting plate's rotation.

[0018] Therefore, this utility model has the following beneficial effects: it prevents users from tilting back too far at once, greatly improving the safety of seat use; and to a certain extent, it can control the adjustment range of the seat chassis in more detail, improving the user's ease of operation. Attached Figure Description

[0019] Figure 1 This is an exploded view of this utility model.

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

[0021] Figure 3 This is a cross-sectional view of the initial state of this utility model.

[0022] Figure 4 This is a cross-sectional view of the first termination angle of this utility model.

[0023] Figure 5 This is a cross-sectional view of the second termination angle of this utility model.

[0024] Figure 6 This is a cross-sectional view of the third termination angle of this utility model.

[0025] Figure 7 This is another structural schematic diagram of the present invention.

[0026] Figure 8 This is an exploded view of the base, connecting plate, and stop block in this utility model.

[0027] Figure 9 This is an exploded view of the connecting plate and the gear block in this utility model.

[0028] As shown in the picture:

[0029] 1. Base, 1.1 Base body, 1.2 Support plate, 1.3 Limiting groove

[0030] Base plate 2, rocker plate 3

[0031] 4. Connecting plate, 4.1 gear shift groove, 4.2 gear shift recess.

[0032] 5. Gear block, 5.1. Abutment part, 5.2. Elastic locking part, 5.3. Actuating part, 5.4. Limiting protrusion. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the utility model will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0034] Example 1, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9The seat chassis termination angle adjustment device shown includes a base 1 and a base plate 2. The two ends of the base 1 are respectively hinged to a rocker arm 3 and a connecting plate 4, forming a four-bar linkage with the base plate 2. The connecting plate 4 can rotate and abut against the end of the base 1. A stop block 5 is slidably provided on the connecting plate 4. The inner end of the stop block 5 can slide between the end of the connecting plate 4 and the end of the base 1 so that the end of the base 1 abuts against the stop block 5, thereby controlling the termination angle of the rotation of the connecting plate 4.

[0035] In most commercially available chairs, the backrest is fixed to the chassis, and the compression force of the chassis springs is adjusted via operation, thereby allowing for adjustments to the seat height and backrest tilt. The backrest and seat are adjusted in tandem via the chassis. However, existing chair chassis have a fixed termination angle for each adjustment, meaning the maximum seat height and backrest tilt angle are fixed each time. If a user leans back to adjust the backrest angle and seat height, they easily press the chair chassis directly to the fixed termination angle, making chair chassis adjustment difficult. To address this issue, a chair chassis termination angle adjustment device is provided that can control the termination angle of the chair chassis for each adjustment.

[0036] The seat chassis termination angle adjustment device in the above embodiment controls the termination angle of the seat chassis for each adjustment via the gear block 5. That is, the termination angle of the seat chassis can be changed each time the user adjusts the seat height and backrest tilt. Before the user adjusts the seat height and backrest tilt each time, the termination angle of the seat chassis is pre-adjusted by sliding the gear block 5. Even if the user presses the backrest back forcefully, the seat will not reach the maximum height of the entire seat chassis and the maximum tilt of the backrest, preventing the user from leaning back too much at once and greatly improving the safety of seat use. In addition, it can control the adjustment range of the seat chassis in more detail to a certain extent, improving the user's ease of operation.

[0037] In this embodiment, the termination angle of the seat chassis is not the maximum height of the overall seat and the maximum tilt of the backrest, but rather the maximum height of the seat and the maximum tilt of the backrest that the user can achieve in a single adjustment. This technical solution slides the stop block 5 between the end of the base 1 and the connecting plate 4, with the end of the base 1 abutting against the stop block 5. This controls the termination angle of the rotation of the connecting plate 4, thereby fixing the maximum height of the seat and the tilt angle of the backrest during each adjustment. However, the stop block 5 does not affect the overall fixation of the maximum height of the seat and the tilt angle of the backrest on the seat chassis.

[0038] In the prior art, the base plate 2 of the seat chassis is positioned above the base 1. One end of the base plate 2 is hinged to the base 1 via a rocker arm 3, and the other end is hinged to the base 1 via a connecting plate 4. The base plate 2, connecting plate 4, base 1, and rocker arm 3 are sequentially hinged end-to-end to form a four-bar linkage. The seat is positioned on the base plate 2, and the backrest is positioned on the rocker arm 3. The rocker arm 3 and the base plate 2 interact to adjust the height of the seat chassis and the angle of the backrest. The seat chassis also includes a resistance device, a locking device, etc., which will not be described in detail in this embodiment.

[0039] Example 2, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 The seat chassis termination angle adjustment device shown includes a base 1 and a base plate 2. The two ends of the base 1 are respectively hinged to a rocker arm 3 and a connecting plate 4, forming a four-bar linkage with the base plate 2. The connecting plate 4 can rotate and abut against the end of the base 1. A stop block 5 is slidably provided on the connecting plate 4. The inner end of the stop block 5 can slide between the end of the connecting plate 4 and the end of the base 1 so that the end of the base 1 abuts against the stop block 5, thereby controlling the termination angle of the rotation of the connecting plate 4.

[0040] In this embodiment, the connecting plate 4 is provided with a gear shift groove 4.1 that cooperates with the gear shift block 5, and part of the gear shift groove 4.1 cooperates with the end of the base 1. The gear shift block 5 is slidably disposed on the gear shift groove 4.1, and the gear shift groove 4.1 is provided with a sliding gear that cooperates with the gear shift block 5, so that the gear shift block 5 can slide and stay on the gear shift groove 4.1.

[0041] Specifically, the shift block 5 includes an abutment part 5.1 located inside the connecting plate 4 and a toggle part 5.3 located outside the connecting plate 4. The toggle part 5.3 moves the abutment part 5.1 between the connecting plate 4 and the end of the base 1 so that the end of the base 1 can abut against the abutment part 5.1. The abutment part 5.1 and the toggle part 5.3 are located on the inner and outer sides of the connecting plate 4 respectively and are connected. When the user needs to adjust the end angle of the seat chassis to the maximum angle of the entire seat chassis, it is not necessary to slide the inner end of the shift block 5 between the end of the base 1 and the connecting plate 4; when the end angle of the seat chassis needs to be adjusted, sliding the inner end of the shift block 5 between the end of the base 1 and the connecting plate 4 can control the end angle of the seat chassis each time.

[0042] In this embodiment, the gear block 5 further includes an elastic locking part 5.2, which is located between the abutting part 5.1 and the toggle part 5.3, and is slidably disposed in the gear slide groove 4.1.

[0043] The seat chassis termination angle adjustment device in the above embodiment controls the termination angle of the seat chassis for each adjustment via the gear block 5. That is, the termination angle of the seat chassis can be changed each time the user adjusts the seat height and backrest tilt. Before the user adjusts the seat height and backrest tilt each time, the termination angle of the seat chassis is pre-adjusted by sliding the gear block 5. Even if the user presses the backrest back forcefully, the seat will not reach the maximum height of the entire seat chassis and the maximum tilt of the backrest, preventing the user from leaning back too much at once and greatly improving the safety of seat use. In addition, it can control the adjustment range of the seat chassis in more detail to a certain extent, improving the user's ease of operation.

[0044] The gear shift groove 4.1 is further optimized. At least two sets of gear shift grooves 4.2 are provided on the inner wall of the gear shift groove 4.1. The gear shift grooves 4.2 cooperate with the elastic locking part 5.2, and at least one gear shift groove 4.2 cooperates with the end of the base 1. The elastic locking part 5.2 elastically engages with the gear shift groove 4.2, and the elastic locking part 5.2 can slide and switch within different gear shift grooves 4.2 to move the gear block 5 to different gear positions on the connecting plate 4. For example... Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, the initial state of the seat chassis is as follows: Figure 3 As shown; when the entire seat chassis reaches the termination angle, as Figure 4 As shown, the gear shift block is not active at this time; to change the final angle of each seat chassis adjustment, slide the gear shift block to make it move as shown. Figure 5 , Figure 6 As shown.

[0045] The gear position holes are further optimized, and the gear position blocks 5 are distributed along the axial direction of the hinge between the base 1 and the connecting plate 4.

[0046] The gear shift hole is further optimized. The side of the gear shift block 5 facing the end of the base 1 is beveled, and the thickness of the lower end of the gear shift block 5 is less than the thickness of the upper end of the gear shift block 5. This allows the inner end of the gear shift block 5 to slide continuously between the end of the connecting plate 4 and the end of the base 1, so that the end of the base 1 abuts against the gear shift block 5, thereby controlling different termination angles of the rotation of the connecting plate 4.

[0047] Therefore, this utility model has the following beneficial effects: it prevents users from tilting back too far at once, greatly improving the safety of seat use; and to a certain extent, it can control the adjustment range of the seat chassis in more detail, improving the user's ease of operation.

[0048] Example 3, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 The seat chassis termination angle adjustment device shown includes a base 1 and a base plate 2. The two ends of the base 1 are respectively hinged to a rocker arm 3 and a connecting plate 4, forming a four-bar linkage with the base plate 2. The connecting plate 4 can rotate and abut against the end of the base 1. A stop block 5 is slidably provided on the connecting plate 4. The inner end of the stop block 5 can slide between the end of the connecting plate 4 and the end of the base 1 so that the end of the base 1 abuts against the stop block 5, thereby controlling the termination angle of the rotation of the connecting plate 4.

[0049] In this embodiment, the gear shift block 5 is provided with a limiting protrusion 5.4, and the end of the base 1 is provided with a limiting groove 1.3 that mates with the limiting protrusion 5.4. The limiting protrusion 5.4 and the limiting groove 1.3 mate, and rotating the connecting plate 4 causes the end of the base 1 to abut against the gear shift block 5. At the same time, the limiting protrusion 5.4 and the limiting groove 1.3 mate to prevent the gear shift block 5 from moving after the user adjusts the seat height and the backrest tilt, further limiting the position of the gear shift block 5.

[0050] Specifically, the number of gear positions on the upper limit protrusion 5.4 of the gear position block 5 is one less than the number of gear positions on the gear position groove 4.2 within the gear position slide 4.1. The extra gear position within the gear position slide 4.1 is the gear position when the gear position block 5 does not need to mate with the end of the base 1.

[0051] The seat chassis termination angle adjustment device in the above embodiment controls the termination angle of the seat chassis for each adjustment via the gear block 5. That is, the termination angle of the seat chassis can be changed each time the user adjusts the seat height and backrest tilt. Before the user adjusts the seat height and backrest tilt each time, the termination angle of the seat chassis is pre-adjusted by sliding the gear block 5. Even if the user presses the backrest back forcefully, the seat will not reach the maximum height of the entire seat chassis and the maximum tilt of the backrest, preventing the user from leaning back too much at once and greatly improving the safety of seat use. In addition, it can control the adjustment range of the seat chassis in more detail to a certain extent, improving the user's ease of operation.

[0052] In this embodiment, the connecting plate 4 is provided with a gear shift groove 4.1 that cooperates with the gear shift block 5, and part of the gear shift groove 4.1 cooperates with the end of the base 1. The gear shift block 5 is slidably disposed on the gear shift groove 4.1, and the gear shift groove 4.1 is provided with a sliding gear that cooperates with the gear shift block 5, so that the gear shift block 5 can slide and stay on the gear shift groove 4.1.

[0053] Specifically, the shift block 5 includes an abutment part 5.1 located inside the connecting plate 4 and a toggle part 5.3 located outside the connecting plate 4. The toggle part 5.3 moves the abutment part 5.1 between the connecting plate 4 and the end of the base 1 so that the end of the base 1 can abut against the abutment part 5.1. The abutment part 5.1 and the toggle part 5.3 are located on the inner and outer sides of the connecting plate 4 respectively and are connected. When the user needs to adjust the end angle of the seat chassis to the maximum angle of the entire seat chassis, it is not necessary to slide the inner end of the shift block 5 between the end of the base 1 and the connecting plate 4; when the end angle of the seat chassis needs to be adjusted, sliding the inner end of the shift block 5 between the end of the base 1 and the connecting plate 4 can control the end angle of the seat chassis each time.

[0054] In this embodiment, the gear block 5 further includes an elastic locking part 5.2, which is located between the abutting part 5.1 and the toggle part 5.3, and is slidably disposed in the gear slide groove 4.1.

[0055] The gear shift groove 4.1 is further optimized. At least two sets of gear shift grooves 4.2 are provided on the inner wall of the gear shift groove 4.1. The gear shift grooves 4.2 cooperate with the elastic locking part 5.2, and at least one gear shift groove 4.2 cooperates with the end of the base 1. The elastic locking part 5.2 elastically engages with the gear shift groove 4.2, and the elastic locking part 5.2 can slide and switch within different gear shift grooves 4.2 to move the gear block 5 to different gear positions on the connecting plate 4.

[0056] The gear position holes are further optimized, and the gear position blocks 5 are distributed along the axial direction of the hinge between the base 1 and the connecting plate 4.

[0057] The gear shift hole is further optimized. The side of the gear shift block 5 facing the end of the base 1 is beveled, and the thickness of the lower end of the gear shift block 5 is less than the thickness of the upper end of the gear shift block 5. This allows the inner end of the gear shift block 5 to slide continuously between the end of the connecting plate 4 and the end of the base 1, so that the end of the base 1 abuts against the gear shift block 5, thereby controlling different termination angles of the rotation of the connecting plate 4.

[0058] Therefore, this utility model has the following beneficial effects: it prevents users from tilting back too far at once, greatly improving the safety of seat use; and to a certain extent, it can control the adjustment range of the seat chassis in more detail, improving the user's ease of operation.

[0059] Based on Embodiments 1, 2, and 3, the basic structure of the base 1 is further optimized. The base 1 includes a base body 1.1 and support plates 1.2 disposed on both sides of the base body 1.1. The connecting plate 4 rotates and abuts against the ends of the support plates 1.2. When the stop block 5 slides between the connecting plate 4 and the ends of the support plates 1.2, the ends of the support plates 1.2 abut against the sides of the stop block 5. The base 1, with its support plates 1.2 on both sides of the base body 1.1 abutting against the inner ends of the connecting plate 4 or the stop block 5, has a more stable structure.

[0060] The specific embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the specific scope of implementation of this utility model. All equivalent changes made to the shape and structure of this utility model should be included within the protection scope of this utility model.

Claims

1. A seat chassis end angle adjustment device comprising a base and a bottom plate, both ends of the base are respectively hinged to a rocker plate and a connecting plate, and the base and the bottom plate form a four-bar mechanism, characterized in that, The connecting plate rotates and can abut against the end of the base, a gear block is slidably arranged on the connecting plate, and the inner end of the gear block can slide to between the connecting plate and the end of the base to make the end of the base abut against the gear block to control the final angle of rotation of the connecting plate.

2. A seat pan end angle adjustment device according to claim 1, wherein A gear slot matched with the gear block is arranged on the connecting plate, and part of the gear slot is matched with the end of the base.

3. A seat pan end angle adjustment device according to claim 2, wherein The gear block comprises an abutting part on the inner side of the connecting plate and a pushing part on the outer side of the connecting plate, and the pushing part pushes the abutting part to between the connecting plate and the end of the base to make the end of the base abut against the abutting part.

4. A seat pan end angle adjustment device according to claim 3, wherein The gear block further comprises an elastic clamping part between the abutting part and the pushing part, and the elastic clamping part is slidably arranged in the gear slot.

5. A seat pan end angle adjustment device according to claim 4, wherein At least two groups of gear recesses are arranged on the inner side wall of the gear slot, the gear recesses are matched with the elastic clamping part, and at least one gear recess is matched with the end of the base.

6. A seat pan end angle adjustment device according to claim 5, wherein A limiting convex is arranged on the gear block, and a limiting slot matched with the limiting convex is arranged on the end of the base.

7. A seat pan end angle adjustment device according to claim 6, wherein The number of gears of the limiting convex on the gear block is one less than the number of gears of the gear recesses in the gear slot.

8. A seat pan end angle adjustment device according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7, characterized in that, The base comprises a base body and support plates arranged on both sides of the base body, the connecting plate rotates and can abut against the end of the support plate, and when the gear block slides to between the connecting plate and the end of the support plate, the end of the support plate abuts against both sides of the gear block.

9. A seat pan end angle adjustment device according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7, characterized in that, The gear blocks are distributed along the axis direction of the hinge between the base and the connecting plate.

10. A seat pan end angle adjustment device according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7, characterized in that, The side of the gear block facing the end of the base is a bevel, and the thickness of the lower end of the gear block is less than the thickness of the upper end of the gear block.

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