A type of seat

Abstract

This invention discloses a seat, including a backrest and a lumbar support mechanism connected to the backrest. The lumbar support mechanism includes a central lumbar support and lumbar wrapping supports connected to the central lumbar support. A connecting portion extends symmetrically from the back of the lumbar wrapping supports, and a rotation positioning mechanism is connected to the two connecting portions. The rotation positioning mechanism includes a positioning block located behind the central lumbar support. The positioning block forms at least two positions: a free position and a limited position. When the positioning block is in the limited position, it abuts against the rear end face of the central lumbar support to prevent it from moving backward. When the positioning block is in the free position, it does not restrict the movement of the central lumbar support, allowing it to move backward under the force of support and causing the two lumbar wrapping supports to rotate synchronously. The rotation positioning mechanism makes the previously uncontrollable three-lumbar support structure controllable. In the free position, it can freely sway and wrap around the waist like a regular three-lumbar support, while in the limited position, it fixes the lumbar support, ensuring it supports the waist and prevents it from shifting.

Description

Technical Field

[0001] This invention relates to the field of chair technology, and in particular to a chair. Background Technology

[0002] To meet the needs of modern people who sit for long periods, most chairs now come with lumbar supports to provide comfort and health benefits. However, with only one lumbar support, the contact area between the lower back and the support is small when the user leans against the chair back, resulting in poor support. Therefore, double lumbar supports and the more advanced triple lumbar supports have emerged. Triple lumbar supports work together to support the lower back when the user leans against the chair back, achieving multi-directional support and making it more comfortable to use. However, sometimes users need to maintain an upright posture for a long time, and their backs are not pressed tightly against the chair back. In this case, the lumbar support needs to be able to support the lower back and not recoil due to the force of leaning. Existing triple lumbar supports cannot meet the needs of both situations at the same time.

[0003] Therefore, we need a chair that can provide good lumbar support during normal use, bringing a comfortable experience to the user, and when it is necessary to sit upright for a long time, it can press firmly against the user's waist to help the user sit upright and reduce the burden of sitting for a long time, thus meeting the needs of users in both situations. Summary of the Invention

[0004] To address the aforementioned technical problems, the present invention aims to provide a seat that, by equipping the lumbar support mechanism with a rotation positioning mechanism, allows the lumbar support to switch between a free and a limited state, thereby adjusting the activity state and range of the lumbar support mechanism to meet the needs of users in different situations.

[0005] The technical solution of this invention is implemented as follows:

[0006] A chair includes a backrest and a lumbar support mechanism connected to the backrest. The lumbar support mechanism includes a central lumbar support and two side lumbar supports connected to the central lumbar support. Symmetrical connecting portions extend from the back of the two side lumbar supports, and rotational positioning mechanisms are connected to the two connecting portions. The rotational positioning mechanism includes a positioning block located behind the central lumbar support. The positioning block has at least two positions: a free position and a limited position. When the positioning block is in the limited position, it abuts against the rear end face of the central lumbar support to prevent it from moving backward. When the positioning block is in the free position, it does not restrict the movement of the central lumbar support, allowing it to move backward under the force of support and causing the two side lumbar supports to rotate synchronously. The rotational positioning mechanism makes the previously uncontrollable three-lumbar support structure controllable. In the free position, it can freely sway and support the waist like a regular three-lumbar support, while in the limited position, it fixes the lumbar support, ensuring it supports the waist and prevents it from shifting.

[0007] Preferably, the rotation positioning mechanism further includes a knob and a rotating shaft; the connecting parts on both sides have symmetrical through holes, the rotating shaft passes through the two through holes, the knob is connected to at least one end of the rotating shaft, the positioning block is mounted on the rotating shaft and rotates synchronously with the rotating shaft, and a limit stop is formed at the front end of the positioning block. By rotating the knob to drive the rotating shaft to rotate, the positioning block also rotates, thereby adjusting to different positions and realizing the switching between the free position and the limit position of the lumbar support. The process principle is simple and the operation is convenient.

[0008] Preferably, the connection between the positioning block and the rotating shaft is eccentrically positioned, with at least two abutting surfaces formed at the limiting stop at the front end of the positioning block. An angle is formed between any two adjacent abutting surfaces. The portion of the outer contour of the positioning block outside the abutting surfaces forms a clearance surface that does not restrict the movement of the central lumbar support. This clearance surface corresponds to the free stop of the positioning block. The vertical distance from the rotating shaft to the abutting surface is greater than the vertical distance from the rotating shaft to the clearance surface. When the abutting surface abuts against the rear end face of the central lumbar support, the movement of the central lumbar support is restricted. When the clearance surface faces the central lumbar support, the mechanism is in a free-moving state, and the central lumbar support can swing back and forth within its range. When the abutting surface faces the central lumbar support, the mechanism is in a limited state, shortening the range of motion of the central lumbar support.

[0009] Preferably, two abutment surfaces are formed at the limiting stop at the front end of the positioning block, namely a first abutment surface and a second abutment surface, and the vertical distance from the rotating shaft to the first abutment surface is less than the vertical distance from the rotating shaft to the second abutment surface. This allows for the selection of different positions and is applicable to various situations.

[0010] Preferably, an angle is formed between the abutment surface and the clearance surface. When the positioning block rotates past the angle so that the clearance surface aligns with the rear end surface of the central lumbar support, the switch from the limited position to the free position is completed. Adjustment is convenient and simple.

[0011] Preferably, the central lumbar support has side wings extending on both sides. The lumbar support is divided into a proximal end closer to the central lumbar support and a distal end farther from the central lumbar support. The side wings are staggered with the proximal end of the lumbar support and cover the front surface of the proximal end of the lumbar support. When the central lumbar support sways, the side wings push the proximal end, causing the lumbar support to sway simultaneously, thus achieving the lumbar-hugging effect.

[0012] Preferably, the back of the central lumbar support is provided with an annular elastic body. One annular surface of the annular elastic body contacts the rear end surface of the central lumbar support. When the central lumbar support moves backward, it compresses the annular elastic body, causing it to contract and deform, thus generating a restoring elastic force. The annular elastic sheet deforms when the central lumbar support is pressed backward, generating a restoring elastic force, which allows the lumbar support to better support the waist and allows the lumbar support to return to its initial state after the pressure is removed.

[0013] Preferably, the width of the annular elastic piece is smaller than the width of the central lumbar support, and the mating position of the positioning block with the central lumbar support is offset from the contact position of the annular elastic piece with the central lumbar support. This ensures that the annular elastic piece does not interfere with the sway of the lumbar support and only provides restoring elasticity to the central lumbar support.

[0014] Preferably, a deformation clearance space is formed within the annular elastic body, through which the rotating shaft passes, and the positioning blocks are located outside the annular elastic body and close to both sides of the annular elastic body. This saves space, and the rotating shaft and positioning blocks do not interfere with the setting of the annular elastic sheet.

[0015] Preferably, the annular elastomer is integrally formed by wrapping a plastic elastic plate around it.

[0016] Preferably, the plastic elastic sheet is made of PP material.

[0017] Preferably, the central lumbar support and the lumbar support are connected by an elastic connector, which is an integrally formed V-shaped elastic sheet. The two ends of the V-shaped elastic sheet are fixedly connected to the central lumbar support and the lumbar support, respectively. The V-shaped elastic sheet strengthens the linkage between the lumbar support and the central lumbar support, and also provides a restoring elastic force to the lumbar support, allowing it to automatically return to its initial state after the force is removed.

[0018] Preferably, the central lumbar support has connecting grooves on both sides of its rear end and on the inner side of its proximal end. The two ends of the V-shaped elastic piece are inserted into the connecting grooves and fixed with screws, allowing the central lumbar support and the waistband to be elastically connected. When the central lumbar support and the waistband move together, the opening of the V-shaped elastic piece increases or decreases. The central lumbar support and the waistband are elastically connected by inserting buckles, resulting in a simple structure that is easy to install.

[0019] Preferably, when the positioning block is in the free position, the rotation range of the waist support is 20°-40°.

[0020] The principle and beneficial effects of the present invention, which adopts the above technical solution, are as follows:

[0021] This invention provides a seat in which the lumbar support can be adjusted between a limited position and a free position by equipping the lumbar support mechanism with a rotation positioning mechanism, so as to meet the needs of users in different occasions.

[0022] Specifically, the positioning block switches between the limited and free modes. When the user wants to sit more comfortably and wants the lumbar support to hug their waist, the positioning block switches to the free mode. At this time, the central lumbar support can move freely. When the user needs to sit upright for a long time, the positioning block switches to the limited mode. At this time, the swaying angle of the central lumbar support is limited, which can prevent the user's waist from shifting backward and distribute the pressure of sitting upright for a long time. The two modes can be easily switched, optimizing the user experience. Attached Figure Description

[0023] Figure 1 This is a 3D view of the front side of the seat;

[0024] Figure 2 This is a 3D view of the rear of the seat;

[0025] Figure 3 An exploded view of the seat's rotation and positioning mechanism;

[0026] Figure 4 A 3D view of the positioning block;

[0027] Figure 5 This is a schematic diagram of the second abutment surface conforming to the central lumbar support in the embodiment, at which point it is in the second limit position;

[0028] Figure 6 This is a schematic diagram of the first abutting surface conforming to the central lumbar support in the embodiment, which is at the first limit position at this time;

[0029] Figure 7 This is a schematic diagram of the avoidance surface and the back of the central waist support in the embodiment, which is in the free position.

[0030] The reference numerals in the attached figures are as follows: 1-Central waist support, 2-Waist support, 3-Connecting part, 4-Connecting surface, 5-Positioning block, 6-Knob, 7-Rotating shaft, 8-Through hole, 9-Connecting post, 10-Pressure cap, 11-Free end, 12-First abutting surface, 13-Second abutting surface, 14-Side wing, 15-Proximal end, 16-Distal end, 17-Annular elastomer, 18-Connecting groove, 19-V-shaped elastic sheet, 20-Avoidance surface, 21-Corner. Implementation

[0031] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0032] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0033] The specific embodiments of the present invention are as follows:

[0034] like Figure 1-3As shown, the present invention provides a seat, including a backrest (not shown) and a lumbar support mechanism connected to the backrest. The lumbar support mechanism includes a central lumbar support 1 and two lumbar supports 2 located on both sides of the central lumbar support 1 and elastically connected to it. Both the central lumbar support 1 and the lumbar supports 2 are arc-shaped with a forward arch and a backward curve in the middle section. The height of the central lumbar support 1 is greater than its own width, and the width of the central lumbar support 1 is less than the width of the lumbar supports 2. The central lumbar support 1 is thicker than the lumbar supports 2, causing the central lumbar support 1 to protrude forward beyond the lumbar supports 2. A connecting portion 3 extends symmetrically from the back of the two lumbar supports 2. The connecting portion 3 extends obliquely and bends to form a connecting surface 4. A rotation positioning mechanism is connected through the connecting surface 4. When used on a chair, the connecting surface 4 is also used to connect to the corresponding position of the chair back so that the lumbar support 2 can be supported and fixed. The rotating positioning mechanism includes two positioning blocks 5, which are located behind the central lumbar support 1. Each positioning block 5 can be designed to correspond to different positions as needed. For example, in this embodiment, it can be set to three positions, namely the free position, the first limit position, and the second limit position. When the positioning block 5 is adjusted to the first limit position, the positioning block 5 abuts against the rear end face of the central lumbar support 1 to prevent the central lumbar support 1 from moving backward. When the positioning block 5 is adjusted to the second limit position, the central lumbar support 1 can move backward by 2-3cm. In the free position, the positioning block 5 releases the central lumbar support 1 so that the central lumbar support 1 can be freely adjusted back and forth within a range of 5-7cm.

[0035] The above describes the main components of the seat. The following sections will provide a detailed description of each component:

[0036] Specifically, such as Figure 3 As shown, the rotation positioning mechanism includes two knobs 6, a rotating shaft 7, and a positioning block 5. Symmetrical through holes 8 are opened on the connecting surfaces 4 on both sides. The rotating shaft 7 passes through the two through holes 8. A connecting post 9 extends from the inner side of the knob 6 towards the opposite knob 6. The connecting post 9 is internally connected. The rotating shaft 7 is inserted into the connecting post 9, and then the connecting post 9 is inserted into the through hole 8. A limiting pin is driven into the side wall of the connecting post 9 to connect the rotating shaft 7 and the connecting post 9 together, enabling them to rotate circumferentially together. A pressure cap 10 is sealed at the end of the knob 6 to make the end of the knob 6 flat and aesthetically pleasing. The positioning block 5 is passed through by the rotating shaft 7. The cross-section of the rotating shaft can be configured as polygonal or irregular, such as hexagonal or triangular, and the shape of the perforation on the positioning block 5 matches it. Therefore, the two can rotate synchronously, meaning that the positioning block 5 rotates circumferentially with the rotating shaft 7 relative to the rotating shaft 7.

[0037] Furthermore, such as Figure 4As shown, the positioning block 5 includes a free end 11 near the connection position between the positioning block 5 and the rotating shaft 7, and a first abutting surface 12 and a second abutting surface 13 away from the connection position between the positioning block 5 and the rotating shaft 7. The portion of the outer contour of the positioning block other than the first abutting surface 12 and the second abutting surface 13 forms a clearance surface 20 that does not restrict the movement of the central waist support. The clearance surface 20 corresponds to the free stop of the positioning block. In this embodiment, the free end 11 is formed at the rear end of the positioning block 5, the first abutting surface 12 and the second abutting surface 13 are formed at the front end of the positioning block 5, and the clearance surface 20 is formed on the upper and lower sides of the positioning block 5.

[0038] An angle is formed between the first abutment surface 12 and the second abutment surface 13, which can range from 90 to 140 degrees. The vertical distance from the pivot to the first abutment surface 12 or the second abutment surface 13 is greater than the vertical distance from the pivot to the clearance surface 20. When the corresponding abutment surface abuts against the rear end face of the central lumbar support, the movement of the central lumbar support is restricted. An angle 21 is formed between the corresponding abutment surface and the adjacent clearance surface. When the positioning block 5 rotates past the angle 21 so that the clearance surface 20 meets the rear end face of the central lumbar support, the switch from the limited position to the free position is completed; that is, when the clearance surface 20 faces the central lumbar support, the mechanism is in a free movement state, and the central lumbar support can swing back and forth within the range.

[0039] When the first abutment surface 12 and the second abutment surface 13 face the central waist support 1, that is, when the long section of the positioning block faces the central waist support 1, the mechanism is in a limited state, which shortens or restricts the range of motion of the central waist support.

[0040] like Figure 7 As shown, the central lumbar support 1 is in its initial state. When the positioning block 5 is in the free position, the positioning block 5 releases the central lumbar support 1, allowing the central lumbar support 1 to freely adjust back and forth within a range of 0-6cm, with a relatively large range of motion; as shown... Figure 6 As shown, when the first abutment surface 12 faces the central lumbar support 1, it is in the first limiting position, and the central lumbar support 1 is blocked by the positioning block 5 and cannot move backward; as Figure 5 As shown, when the second abutment surface 13 faces the central lumbar support 1, it is the second limit position, and the central lumbar support 1 can be freely adjusted back and forth within a distance range of 0-3cm.

[0041] Furthermore, such as Figure 1As shown, the central lumbar support 1 has arc-shaped side wings 14 extending from both sides. The lumbar support 2 is divided into a proximal end 15 near the central lumbar support 1 and a distal end 16 away from the central lumbar support 1. The side wings 14 cover the front surface of the proximal end 15. When the central lumbar support 1 moves backward or sways, the side wings 14 push the proximal end 15 of the lumbar support 2, causing the lumbar support 2 to deflect. The back of the central lumbar support 1 has an annular elastic body 17 with a width smaller than the central lumbar support 1. The annular elastic body 17 is made of PP plastic. The elastic plate is integrally formed around the ring. The front annular surface of the annular elastic body 17 abuts against the back of the central waist support 1 or the two are fixed by spray adhesive. When the central waist support 1 deflects, it compresses the annular elastic body 17 to deform and generate a restoring elastic force. The restoring elastic force gives the central waist support 1 a supporting force, and at the same time, it can restore the central waist support 1 to its initial state after the force is removed. The rotating shaft 7 passes through the space inside the annular elastic body 17, while the two positioning blocks 5 are located on both sides of the annular elastic body 17 near the annular elastic body 17.

[0042] Furthermore, such as Figure 2-3 As shown, rectangular connecting grooves 18 are provided on the inner sides of both sides of the central lumbar support 1 and the inner side of the proximal end 15 of the waist-hugging support 2. The elastic connector is an integrally formed V-shaped elastic sheet 19. The two ends of the V-shaped elastic sheet 19 are inserted into the connecting grooves 18, and the ends of the V-shaped elastic sheet 19 are fixed with screws at the front ends of the central lumbar support 1 and the waist-hugging support 2. This makes the central lumbar support 1 and the waist-hugging support 2 elastically connected. When the central lumbar support 1 swings, the deformation generates a restoring elastic force, so that the waist-hugging support 2 does not swing excessively, making the waist-hugging effect of the entire structure better, and can drive the waist-hugging support 2 to return to the initial state after the force is removed.

[0043] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A seat, comprising a backrest and a lumbar support mechanism connected to the backrest, characterized in that: include: The lumbar support mechanism includes a central lumbar support and two side lumbar supports connected to the central lumbar support. Symmetrical connecting portions extend from the back of the two side lumbar supports, and rotating positioning mechanisms are connected to these connecting portions. Each rotating positioning mechanism includes a positioning block located behind the central lumbar support. The positioning block has at least two positions: a free position and a limited position. When the positioning block is in the limited position, it abuts against the rear end face of the central lumbar support to prevent it from moving backward. When the positioning block is in the free position, it does not restrict the movement of the central lumbar support, allowing it to move backward under the support force and causing the two side lumbar supports to rotate synchronously. The rotating positioning mechanism also includes a knob and a rotating shaft. The connecting part has symmetrical through holes, the rotating shaft passes through two through holes, the knob is connected to at least one end of the rotating shaft, the positioning block is mounted on the rotating shaft and rotates synchronously with the rotating shaft, and the limiting stop is formed at the front end of the positioning block; the connection position of the positioning block and the rotating shaft is eccentrically set, and at least two abutting surfaces are formed at the limiting stop at the front end of the positioning block, and an included angle is formed between each pair of adjacent abutting surfaces. The part of the outer contour of the positioning block outside the abutting surfaces forms a clearance surface that does not restrict the movement of the central lumbar support. The clearance surface corresponds to the free stop of the positioning block. The vertical distance from the rotating shaft to the abutting surface is greater than the vertical distance from the rotating shaft to the clearance surface. When the corresponding abutting surface abuts against the rear end face of the central lumbar support, the movement of the central lumbar support is restricted.

2. The seat according to claim 1, characterized in that: Two abutting surfaces are formed at the front end of the positioning block, namely the first abutting surface and the second abutting surface. The vertical distance from the rotating shaft to the first abutting surface is less than the vertical distance from the rotating shaft to the second abutting surface.

3. A seat according to claim 1, characterized in that: A corner is formed between the contact surface and the avoidance surface. When the positioning block turns over the corner so that the avoidance surface meets the rear end surface of the central waist support, the switch from the limit position to the free position is completed.

4. A seat according to claim 1, characterized in that: The central lumbar support has side wings extending on both sides. The lumbar support is divided into a proximal end close to the central lumbar support and a distal end far from the central lumbar support. The side wings are staggered with the proximal end of the lumbar support and cover the front surface of the proximal end of the lumbar support.

5. A seat according to claim 1, characterized in that: The back of the central lumbar support is provided with an annular elastic body. One annular surface of the annular elastic body contacts the rear end surface of the central lumbar support. When the central lumbar support moves backward, it squeezes the annular elastic body, causing it to contract and deform, thus generating a restoring elastic force.

6. A seat according to claim 5, characterized in that: The width of the annular elastic sheet is smaller than the width of the central lumbar support, and the mating position of the positioning block and the central lumbar support is offset from the contact position of the annular elastic body and the central lumbar support.

7. A seat according to claim 5, characterized in that: A deformation avoidance space is formed within the annular elastic body, and the rotating shaft passes through the deformation avoidance space. The positioning block is located outside the annular elastic body and close to both sides of the annular elastic body.

8. A seat according to claim 5, characterized in that: The ring-shaped elastomer is integrally formed by wrapping a plastic elastic plate around it.

9. A seat according to claim 8, characterized in that: The aforementioned plastic elastic sheet is made of PP material.

10. A seat according to claim 1, characterized in that: The central lumbar support and the lumbar support are connected by an elastic connector, which is an integrally formed V-shaped elastic sheet. The two ends of the V-shaped elastic sheet are fixedly connected to the central lumbar support and the lumbar support, respectively.

11. A seat according to claim 10, characterized in that: The central lumbar support has connecting grooves on both sides of its rear end and on the inner side of its proximal end. The two ends of the V-shaped elastic sheet are inserted into the connecting grooves and fixed with screws, so that the central lumbar support and the waist support are elastically connected. When the central lumbar support and the waist support move together, the opening of the V-shaped elastic sheet becomes larger or smaller.

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