A seat waist rest adjusting structure and a seat

Abstract

The utility model relates to a kind of adjusting structure and seat of seat waist rest, belong to seat adjusting component and seat technical field. Including seat frame, armrest and waist rest, the armrest is equipped with a pair, along seat frame longitudinal direction setting, connecting unit is equipped between the waist rest and armrest, folding unit is equipped between waist rest and seat frame;Further including push rod, driving unit is equipped between folding unit and push rod, the both ends of push rod are fixed with armrest respectively, sliding unit is further equipped between the armrest and seat frame;Under the action of driving unit, push rod drives armrest to slide relative to seat frame, while waist rest is overturned with folding unit and slides relative to seat frame with armrest. It can be conveniently realized that the adjusting structure of waist rest large-angle stepless adjustment is realized large-angle reclining stepless adjustment, and guarantee the gravity center of seat stable, will not fall due to large-angle back flip.

Description

Technical Field

[0001] This utility model relates to an adjustable structure for a lumbar support and a seat, belonging to the technical field of seat adjustment components and seats. Background Technology

[0002] As furniture closely related to human life, chairs bring convenience to people working and meet the needs of daily desk work. In addition, lunch breaks are a frequent use of office chairs, during which users usually recline the chair back to achieve a more comfortable sleeping position. However, current office chairs on the market are relatively conservative in controlling the outward reclining angle, generally around 30 degrees. How to achieve stepless adjustment of a large reclining angle while ensuring the stability of the chair's center of gravity and preventing falls due to large reclining angles, thus expanding the chair's usage scenarios and improving its convenience, comfort, stability, and safety, are technical problems that need to be solved.

[0003] Chinese invention patent CN119586865, published on March 11, 2025, discloses an office chair with a seat cushion and backrest linkage mechanism and an easy-to-fold design. It incorporates a sliding mechanism, a telescopic buffer mechanism, and a linkage mechanism within the seat. The linkage mechanism, telescopic buffer mechanism, and sliding mechanism are linked together via a connecting element. A hinge mechanism is installed between the backrest and armrests, allowing the backrest to rotate around its hinge axis. When the seat cushion moves forward, the sliding mechanism compresses the telescopic buffer mechanism, which in turn pulls the linkage mechanism to rotate the lower end of the backrest forward. Simultaneously, the upper end of the backrest flips backward. For the same flip angle, the backward displacement of the backrest in this office chair is significantly smaller than that of office chairs using a bottom-shaped steel plate as the axis. Therefore, this office chair allows users to maximize their reclining angle while ensuring it doesn't obstruct aisle space during daily rest. However, it still has the following shortcomings: the structure is relatively complex, requiring the cooperation of multiple mechanisms to implement adjustment, making the office chair appear bulky. This utility model aims to solve this technical problem by optimizing the structure, simplifying the adjustment mechanism, achieving stepless adjustment of large-angle reclining, and ensuring the stability of the chair's center of gravity, preventing falls due to large-angle reclining. This expands the chair's usage scenarios, improves its convenience, comfort, stability, and safety, and makes the chair easy to adjust and move. Utility Model Content

[0004] One of the purposes of this utility model is to solve the shortcomings of existing seat lumbar support that is fixed and cannot be adjusted, or that requires manual adjustment of its angle and has limited adjustment range. It provides an adjustment structure that can conveniently achieve stepless adjustment of the lumbar support at a large angle, realize stepless adjustment of the large angle of reclining, and ensure the stability of the seat's center of gravity, so as not to fall over due to large angle reclining.

[0005] The second objective of this utility model is to provide a seat equipped with the lumbar support adjustment structure of this utility model. Based on the lumbar support adjustment structure, the adjustment structure is simplified, and stepless adjustment of large-angle reclining is achieved. At the same time, the center of gravity of the seat is kept stable, and the seat will not fall over due to large-angle reclining. This expands the usage scenarios of the seat, improves the convenience, comfort, stability and safety of use, and the seat is easy to adjust and move.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] An adjustable lumbar support structure for a seat includes a seat frame, armrests and a lumbar support. The armrests are provided in pairs and are arranged along the longitudinal direction of the seat frame. A connecting unit is provided between the lumbar support and the armrests, and a folding unit is provided between the lumbar support and the seat frame.

[0008] It also includes a push rod, a drive unit is provided between the folding unit and the push rod, the two ends of the push rod are respectively fixed to the armrest, and a sliding unit is also provided between the armrest and the seat frame;

[0009] Under the action of the drive unit, the push rod drives the armrest to slide relative to the seat frame, while the lumbar support flips with the folding unit and slides relative to the seat frame along with the armrest.

[0010] Preferably, the connecting unit includes a connector and a fixing member, with the two ends of the connector connected to the lumbar support and the armrest respectively, and fixed by the fixing member.

[0011] Preferably, the connector is L-shaped and has several fixing holes, which are used to fix the connector in place.

[0012] Preferably, the folding unit includes a folding component, which includes a first sub-folding component and a second sub-folding component. The first sub-folding component is fixed to the lumbar support, and the first sub-folding component and the second sub-folding component are rotatably connected by a hinge structure. The second sub-folding component is rotatably connected to the drive unit.

[0013] Preferably, the first sub-folding member is L-shaped, forming a U-shaped folding member with the second sub-folding member. The hinge structure includes a pin, a rotating seat, and a retaining spring, with the rotating seat fixed to the second sub-folding member.

[0014] Preferably, the hinge structure further includes a bushing and a washer, wherein the washer is a silent washer.

[0015] Preferably, the drive unit is a hydraulic cylinder or a pneumatic cylinder, the drive end of the drive unit is rotatably connected to the folding unit, the drive seat of the drive unit is rotatably connected to the support arm, and the support arm is fixedly connected to the base of the seat frame.

[0016] Preferably, the drive end of the drive unit is rotatably connected to the second sub-folding component through the cooperation of a rotating seat and a rotating shaft.

[0017] Preferably, the handrail is provided with an arc-shaped slide rail, the seat frame is provided with a slide shaft, and the slide rail and slide shaft are combined to form a sliding unit. The sliding unit also includes a friction plate arranged along the length of the slide rail, a locking washer that cooperates with the slide shaft, and a locking member that axially fixes the slide shaft.

[0018] Alternatively, the handrail is provided with a sliding seat, the seat frame is provided with a sliding shaft, the sliding seat is sleeved on the sliding shaft, and the sliding seat and the sliding shaft are combined to form a sliding unit.

[0019] A seat includes a seat under-support assembly and a lumbar support structure. The lumbar support structure is fixed to the seat under-support assembly via a base of a seat frame and employs the aforementioned lumbar support adjustment structure.

[0020] The beneficial effects of this utility model are: the adjustable structure enables stepless adjustment of the reclining angle while ensuring the stability of the seat's center of gravity, preventing falls due to large-angle reclining. Based on the lumbar support adjustment structure, the simplified adjustment mechanism enables stepless adjustment of the reclining angle while ensuring the stability of the seat's center of gravity, preventing falls due to large-angle reclining. This expands the seat's usage scenarios, improves convenience, comfort, stability, and safety, and makes the seat easy to adjust and move. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of Embodiment 1 of this utility model;

[0024] Figure 3 This is a schematic diagram of the structure of Embodiment 1 of this utility model;

[0025] Figure 4 This is a schematic diagram of the usage state of Embodiment 1 of this utility model;

[0026] Figure 5 This is a schematic diagram of another usage state of Embodiment 1 of this utility model;

[0027] Figure 6 This is a structural schematic diagram of Embodiment 2 of the present invention;

[0028] Figure 7 This is a structural schematic diagram of Embodiment 2 of the present invention;

[0029] Figure 8 This is a structural schematic diagram of Embodiment 2 of the present invention;

[0030] Figure 9 This is a schematic diagram of the usage state of Embodiment 2 of this utility model;

[0031] Figure 10 This is a schematic diagram of another usage state of Embodiment 2 of this utility model;

[0032] Figure 11 This is a structural schematic diagram of Embodiment 3 of the present invention;

[0033] Figure 12 This is a structural schematic diagram of Embodiment 3 of the present invention;

[0034] Figure 13 This is a structural schematic diagram of Embodiment 3 of the present invention;

[0035] Figure 14 This is a schematic diagram of the usage state of Embodiment 3 of this utility model;

[0036] Figure 15 This is a schematic diagram of another usage state of Embodiment 3 of this utility model.

[0037] Appendix Figure 1-5 The components are labeled as follows: 1. Pin, 2. Bushing, 3. Rotating seat, 4. Washer, 5. Snap ring, 6. Drive unit, 7. Push rod, 8. Seat frame, 9. Armrest, 10. Friction plate, 11. Sliding shaft, 12. Locking washer, 13. Push rod fixing component, 14. Lumbar support, 15. Lumbar support fixing component, 16. Connecting seat fixing component.

[0038] Appendix Figure 6-10 The components are labeled as follows: 1. Pin, 2. Bushing, 3. Rotating seat, 4. Washer, 5. Snap ring, 6. Drive unit, 7. Push rod, 8. Seat frame, 9. Armrest, 10. Sliding seat, 11. Sliding seat pin, 12. Push rod fixing component, 13. Lumbar support, 14. Lumbar support fixing component, 15. Connecting seat fixing component.

[0039] Appendix Figure 11-15 The markings are as follows: 1. Pin, 2. Bushing, 3. Rotating seat, 4. Washer, 5. Snap ring, 6. Electric telescopic rod, 7. Push rod, 8. Seat frame, 9. Armrest, 10. Sliding seat, 11. Sliding seat pin, 12. Push rod fixing part, 13. Rotating shaft pin, 14. Rotating shaft sleeve, 15. Lumbar support, 16. Lumbar support fixing part, 17. Connecting seat fixing part. Detailed Implementation

[0040] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0041] Example 1:

[0042] like Figure 1-5 As shown, an adjustable structure for a seat lumbar support includes a seat frame 8, armrests 9 and a lumbar support 14. The armrests 9 are provided in pairs and are arranged along the longitudinal direction of the seat frame 8. A connecting unit is provided between the lumbar support 14 and the armrests 9, and a folding unit is provided between the lumbar support 14 and the seat frame 8.

[0043] The push rod 7 is included, and a drive unit is provided between the folding unit and the push rod 7. The two ends of the push rod 7 are respectively fixed to the armrest 9, which is specifically fixed by the push rod fixing part 13. A sliding unit is also provided between the armrest 9 and the seat frame 8.

[0044] Under the action of the drive unit, the push rod 7 drives the armrest 9 to slide relative to the seat frame 8, while the lumbar support 14 flips with the folding unit and slides relative to the seat frame 8 along with the armrest 9.

[0045] Specifically, the connecting unit includes a connector and a lumbar support fixing member 15. The two ends of the connector are connected to the lumbar support 14 and the armrest 9 respectively, and are fixed by the lumbar support fixing member 15.

[0046] Specifically, the connector is L-shaped and has several fixing holes, and the waist support fixing member 15 is fixed in conjunction with the fixing holes.

[0047] In this embodiment, the folding unit includes a folding component, which includes a first sub-folding component and a second sub-folding component. The first sub-folding component is fixed to the lumbar support 14, and the first sub-folding component and the second sub-folding component are rotatably connected by a hinge structure. The second sub-folding component is rotatably connected to the driving unit 6.

[0048] Specifically, the first sub-folding member is L-shaped, and together with the second sub-folding member, they form a U-shaped folding member. The hinge structure includes a pin 1, a rotating seat 3, and a retaining spring 5. The rotating seat 3 and the second sub-folding member are fixed by a rotating seat fixing member 16.

[0049] Specifically, the hinge structure also includes a bushing 2 and a washer 4, wherein the washer 4 is a silent washer.

[0050] Specifically, the drive unit 6 is a hydraulic cylinder or a pneumatic cylinder. The drive end of the drive unit 6 is rotatably connected to the folding unit. The drive seat of the drive unit 6 is rotatably connected to the support arm. The support arm is fixedly connected to the base of the seat frame 8.

[0051] In this embodiment, the drive end of the drive unit is rotatably connected to the second sub-folding component through the cooperation of the rotating seat 3 and the rotating shaft. The armrest 9 is provided with an arc-shaped slide rail, and the seat frame 8 is provided with a slide shaft 11. The slide rail and the slide shaft 11 are combined to form a sliding unit. The sliding unit also includes a friction plate 10 arranged along the length direction of the slide rail, a locking washer 12 that cooperates with the slide shaft 11, and a locking component that axially fixes the slide shaft 11.

[0052] A seat according to this embodiment includes a seat under support assembly and a lumbar support structure. The lumbar support structure is fixed to the seat under support assembly via the base of the seat frame 8 and adopts the aforementioned seat lumbar support adjustment structure.

[0053] The beneficial effects of this utility model are: the adjustable structure enables stepless adjustment of the reclining angle while ensuring the stability of the seat's center of gravity, preventing falls due to large-angle reclining. Based on the lumbar support adjustment structure, the simplified adjustment mechanism enables stepless adjustment of the reclining angle while ensuring the stability of the seat's center of gravity, preventing falls due to large-angle reclining. This expands the seat's usage scenarios, improves convenience, comfort, stability, and safety, and makes the seat easy to adjust and move.

[0054] Example 2

[0055] like Figure 6-10 As shown, the basic structure is the same as in Embodiment 1, except that: the handrail is provided with a sliding seat 10, the seat frame 8 is provided with a sliding shaft, the sliding seat 10 is sleeved on the sliding shaft, and the sliding seat 10 and the sliding shaft are combined to form a sliding unit.

[0056] In Embodiment 2, 13 is a lumbar support, 14 is a lumbar support fixing component, and 15 is a connecting seat fixing component.

[0057] Example 3

[0058] like Figure 11-15 As shown, the basic structure is the same as in Embodiment 2, except that the drive unit 6 is an electric telescopic rod. A pivot pin 13 and a pivot sleeve 14 are provided to cooperate with the electric telescopic rod.

[0059] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. An adjustable lumbar support structure for a seat, comprising a seat frame (8), armrests (9), and a lumbar support (14), wherein a pair of armrests (9) are provided and arranged along the longitudinal direction of the seat frame (8), characterized in that, A connecting unit is provided between the lumbar support (14) and the armrest (9), and a folding unit is provided between the lumbar support (14) and the seat frame (8); It also includes a push rod (7), a drive unit (6) is provided between the folding unit and the push rod (7), the two ends of the push rod (7) are respectively fixed to the armrest (9), and a sliding unit is also provided between the armrest (9) and the seat frame (8); Under the action of the drive unit (6), the push rod (7) drives the armrest (9) to slide relative to the seat frame (8), while the lumbar support (14) flips with the folding unit and slides relative to the seat frame (8) along with the armrest (9).

2. The adjustable lumbar support structure according to claim 1, characterized in that, The connecting unit includes a connector and a lumbar support fixing member (15). The two ends of the connector are connected to the lumbar support (14) and the armrest (9) respectively, and are fixed by the lumbar support fixing member (15).

3. The adjustable lumbar support structure according to claim 2, characterized in that, The connector is L-shaped and has several fixing holes. The waist support fixing member (15) is fixed in conjunction with the fixing holes.

4. The adjustable lumbar support structure according to claim 1, characterized in that, The folding unit includes a folding component, which includes a first sub-folding component and a second sub-folding component. The first sub-folding component is fixed to the lumbar support (14). The first sub-folding component and the second sub-folding component are rotatably connected by a hinge structure. The second sub-folding component is rotatably connected to the drive unit (6).

5. The adjustable structure for a seat lumbar support according to claim 4, characterized in that: The first sub-folding member is L-shaped and forms a U-shaped folding member with the second sub-folding member. The hinge structure includes a pin (1), a rotating seat (3) and a retaining ring (5). The rotating seat (3) is fixed to the second sub-folding member by a rotating seat fixing member (16).

6. The adjustable lumbar support structure for a seat according to claim 5, characterized in that: The hinge structure also includes a bushing (2) and a gasket (4), wherein the gasket (4) is a silent gasket.

7. The adjustable structure for a seat lumbar support according to claim 1, characterized in that: The drive unit (6) is an electric telescopic rod, a hydraulic cylinder, or a pneumatic cylinder. The drive end of the drive unit (6) is rotatably connected to the folding unit. The drive seat of the drive unit (6) is rotatably connected to the support arm. The support arm is fixedly connected to the base of the seat frame (8).

8. The adjustable structure for a seat lumbar support according to claim 7, characterized in that: The driving end of the driving unit (6) is rotatably connected to the second sub-folding component through the cooperation of the rotating seat (3) and the rotating shaft.

9. The adjustable structure for a seat lumbar support according to claim 1, characterized in that: The handrail (9) is provided with an arc-shaped slide rail, and the seat frame (8) is provided with a slide shaft. The slide rail and the slide shaft are combined to form a sliding unit. The sliding unit also includes a friction plate arranged along the length of the slide rail, a locking washer that cooperates with the slide shaft, and a locking member that axially fixes the slide shaft. Alternatively, the handrail is provided with a sliding seat, the seat frame (8) is provided with a sliding shaft, the sliding seat is sleeved on the sliding shaft, and the sliding seat and the sliding shaft are combined to form a sliding unit.

10. A seat, comprising a seat under-support assembly and a lumbar support structure, the lumbar support structure being fixed to the seat under-support assembly via a base of a seat frame (8), characterized in that, The seat lumbar support adjustment structure described in any one of claims 1-9 is adopted.

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