Linkage type waist rest adjusting structure

Abstract

A linkage type waist rest adjusting structure comprises a chair back frame, a waist rest frame and a chair seat, the lower end of the chair back frame is connected to the chair seat, the upper end of the waist rest frame is rotatably connected to the chair back frame, the chair seat is provided with an adjusting base, and the lower end of the waist rest frame is provided with an adjusting sliding seat which can move front and back and is matched with the adjusting base in a guiding mode; an adjusting groove is formed in the adjusting sliding seat, and a plurality of gear grooves arranged in the moving direction of the adjusting sliding seat are formed in the adjusting groove; an adjusting base extending into the adjusting groove is arranged on the adjusting base, and a locking piece and an elastic piece used for driving the locking piece to be clamped into the gear groove are arranged on the adjusting base. The relative position between the adjusting base and the adjusting sliding seat is limited through cooperation of the locking piece and the elastic piece, so that fixed connection of the lower end of the waist rest frame is achieved, the overall supporting force of the waist rest frame is improved, the waist rest frame can stably support the waist of a user, and the use comfort of the user is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of chair technology, specifically to a linkage-type lumbar support adjustment structure. Background Technology

[0002] Lumbar support is a key component of office chairs, providing effective support for the user's lower back and relieving lower back fatigue caused by prolonged sitting.

[0003] A chair back assembly with adjustable lumbar support, disclosed in patent application CN221285133U, includes a chair back frame and a lumbar support frame. The chair back frame includes a back support frame, which includes upper frame sides arranged symmetrically on both sides. The lumbar support frame includes lower frame sides arranged symmetrically on both sides. The lower frame sides are rotatably connected to the corresponding upper frame sides, and the lower frame sides can rotate relative to the upper frame sides and remain in the corresponding state. In use, simply rotate and adjust the lumbar support frame to the desired position and hold it in that position. The lumbar support is easy to adjust, allowing the user to comfortably lean against it while sitting, reducing lumbar fatigue during prolonged sitting.

[0004] However, the lumbar support frame of this technical solution is only connected to the backrest frame at the upper angle with adjustable angle. This structural design means that the lower end of the lumbar support frame lacks an effective way to fix and adjust it during use, resulting in insufficient overall support. When the user leans against it, the lumbar support frame cannot stably support the user's waist and is prone to swaying and displacement. This not only reduces the user's experience but may also cause lower back discomfort due to improper support, failing to fully exert the lumbar support frame's protective and supportive function for the waist. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology, this utility model provides a linkage-type lumbar support adjustment structure.

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

[0007] A linkage-type lumbar support adjustment structure includes a chair back frame, a lumbar support frame, and a chair seat. The lower end of the chair back frame is connected to the chair seat, and the upper end of the lumbar support frame is rotatably connected to the chair back frame. The chair seat is characterized by having an adjustment base, and the lower end of the lumbar support frame is provided with an adjustment slide that is movable back and forth and guided onto the adjustment base. The adjustment slide has an adjustment groove, and the adjustment groove contains multiple stop slots arranged along the moving direction of the adjustment slide.

[0008] The adjustment base is provided with an adjustment base extending into the adjustment groove. The adjustment base is provided with a locking member movably connected to the adjustment base and an elastic member for driving the locking member to engage in the gear slot. The two ends of the elastic member are respectively connected to the adjustment base and the locking member.

[0009] In this utility model, the adjusting base is provided with an adjusting movable groove, and a locking port is provided on one side of the adjusting movable groove that extends through and faces the gear slot. The locking member and the elastic member are both located in the adjusting movable groove. A rotating groove is recessed in the adjusting movable groove at its rear end. One end of the locking member can move back and forth and rotate and swing in the rotating groove. The locking member includes a locking protrusion with a corresponding locking port. When the locking protrusion is engaged with any gear slot, it forms a locking position.

[0010] In this utility model, the rotating groove is provided with a rotating guide part, and the locking member also includes a locking body. The rear end of the locking body is inserted into the rotating groove and a rotating guide groove corresponding to the rotating guide part is provided on one side. The rotating guide part is inserted into the rotating guide groove. A locking movement vacancy is left between the rotating guide part and the rotating guide groove so that the locking member can move back and forth and rotate relative to the adjusting base.

[0011] In this utility model, the elastic element is a compression spring, the locking body is provided with an elastic positioning hole groove, the adjusting movable groove is provided with an elastic fitting groove, and the two ends of the elastic element are respectively inserted into the elastic positioning hole groove and the elastic fitting groove.

[0012] In this utility model, the adjusting groove is recessed and has an unlocking groove at its front end. The locking member also includes an unlocking mating part connected to the front end of the locking body and a linkage protrusion connected to the locking body and corresponding to the locking opening. The adjusting groove is provided with a linkage groove, and the linkage protrusion is always inserted into the linkage groove. The linkage groove is provided with a locking reset linkage surface at its front end, and an unlocking linkage inclined surface and a forward movement linkage surface at its rear end.

[0013] In this utility model, the left and / or right sides of the adjusting slide are provided with a slide groove extending from front to back, the adjusting base is provided with a guide seat, and the guide seat is provided with a guide rail part that slides into the slide groove.

[0014] In this utility model, a hinge seat is provided on the front side of the middle part of the chair back frame, and a transverse hinge shaft that can be rotatably connected to the hinge seat is provided on the upper end of the lumbar support frame.

[0015] In this utility model, the lumbar support frame includes two lumbar side supports, a lumbar bottom support connected to the lower ends of the two lumbar side supports at its left and right ends respectively, and a lumbar connecting part connected to the bottom of the lumbar bottom support. The upper inner side of each lumbar side support is connected to the transverse hinge shaft. The front end of the chair back frame is provided with a hinge recess. One end of the hinge seat is installed in the hinge recess. The hinge seat is provided with a transverse hinge hole on the side facing the lumbar side support. The lumbar connecting part is connected to the adjusting slide.

[0016] In this utility model, the upper end of the lumbar support side brace has a side brace limiting part protruding backward, and the side brace limiting part is movably inserted into the hinge recess.

[0017] In this utility model, the bottom of the adjusting slide is provided with two insert seats arranged opposite each other, and the insert seats are provided with waist support slots; the left and right ends of the waist support connecting part are respectively inserted into the waist support slots of the two insert seats, and the waist support connecting part and the adjusting slide are provided with a snap-fit ​​connection structure to position them together.

[0018] The beneficial effects of this utility model are as follows: In this embodiment, the upper end of the lumbar support frame is first rotatably connected to the chair back frame. Then, an adjustable base is provided on the chair seat, and an adjustable slide is provided at the lower end of the lumbar support frame, which can be moved back and forth and is guided and cooperated with the adjustable base. At the same time, the relative position between the adjustable base and the adjustable slide is limited by the cooperation of locking and elastic parts. In this way, the lower end of the lumbar support frame is fixedly connected, which improves the overall support of the lumbar support frame and allows the lumbar support frame to stably support the user's waist, ensuring the user's comfort. At the same time, the degree of arching of the lumbar support frame can be adjusted by adjusting the slide relative to the adjustable base, which can meet the usage requirements of users with different body types. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0020] Figure 1 A schematic diagram showing the backrest and lumbar support mounted on the seat via an adjustable base and an adjustable slide.

[0021] Figure 2 A schematic diagram showing the combination of the chair back frame, lumbar support frame, adjustment base, and adjustment slide;

[0022] Figure 3 Exploded view of the chair back frame and lumbar support frame;

[0023] Figure 4 This is a schematic diagram showing the lumbar support connecting part installed on the adjusting slide.

[0024] Figure 5 For the explosion of the adjusting base, adjusting slide, adjusting base, locking part and elastic part Figure 1 ;

[0025] Figure 6 For the explosion of the adjusting base, adjusting slide, adjusting base, locking part and elastic part Figure 2 ;

[0026] Figure 7 This is a schematic diagram showing the installation of the locking and elastic components. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0028] It should be noted that if any directional indication (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.) is involved in the embodiments of this utility model, the directional indication is only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0029] Furthermore, unless otherwise explicitly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection using welding, a detachable connection using bolts, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0031] Reference Figure 1-7 A linkage-type lumbar support adjustment structure includes a backrest frame 1, a lumbar support frame 2, and a seat 3. The lower end of the backrest frame 1 is bolted to the seat 3, and the upper end of the lumbar support frame 2 is rotatably connected to the backrest frame 1. The seat 3 is provided with an adjustment base 4, and the lower end of the lumbar support frame 2 is provided with an adjustment slide 5 that is movable back and forth and guided on the adjustment base 4. The adjustment slide 5 is provided with an adjustment groove 51, and the adjustment groove 51 is provided with a plurality of stop slots 52 arranged along the moving direction of the adjustment slide 5.

[0032] Furthermore, the adjustment base 4 is provided with an adjustment base 6 extending into the adjustment groove 51. The adjustment base 6 is provided with a locking member 7 movably connected to the adjustment base 6 and an elastic member 8 for driving the locking member 7 to engage in the gear slot 52. The two ends of the elastic member 8 are respectively connected to the adjustment base 6 and the locking member 7.

[0033] In this embodiment, the upper end of the lumbar support frame 2 is first rotatably connected to the chair back frame 1. Then, an adjustment base 4 is provided on the chair seat 3, and an adjustment slide 5, which can move back and forth and is guided and cooperated with the adjustment base 4, is provided at the lower end of the lumbar support frame 2. At the same time, the relative position between the adjustment base 4 and the adjustment slide 5 is limited by the cooperation of the locking member 7 and the elastic member 8. In this way, the lower end of the lumbar support frame 2 is fixedly connected, which improves the overall support of the lumbar support frame 2 and allows the lumbar support frame 2 to stably support the user's waist and ensure the user's comfort. At the same time, the degree of arching of the lumbar support frame 2 can be adjusted by adjusting the slide 5 relative to the adjustment base 4, which can meet the usage requirements of users with various body types.

[0034] In this embodiment, the adjusting base 6 is provided with an adjusting movable groove 61. A locking port 62 is provided on one side of the adjusting movable groove 61, which extends through and faces the gear slot 52. The locking member 7 and the elastic member 8 are both located in the adjusting movable groove 61. A rotating groove 63 is recessed in the adjusting movable groove 61 at its rear end. One end of the locking member 7 can move back and forth and rotate and swing in the rotating groove 63. The locking member 7 includes a locking protrusion 71 with a corresponding locking port 62. The elastic member 8 uses elasticity to push the other end of the locking member 7 to make the locking protrusion 71 rotate and swing in the direction of the locking port 62. When the locking protrusion 71 is engaged with any gear slot 52, it forms a locking position, thereby limiting the position of the adjusting slide 5 on the adjusting base 4 and realizing the locking of the lower end position of the waist support 2.

[0035] In this embodiment, the rotating groove 63 is provided with a rotating guide part 64, and the locking member 7 further includes a locking body 72. The rear end of the locking body 72 is inserted into the rotating groove 63, and one side is provided with a rotating guide groove 73 corresponding to the rotating guide part 64. The rotating guide part 64 is inserted into the rotating guide groove 73. A locking movement vacancy is left between the rotating guide part 64 and the rotating guide groove 73 to allow the locking member 7 to move back and forth and rotate relative to the adjusting base 6. When the locking member 7 rotates, it rotates about the rotating guide part 64 as the rotation axis. Further, the elastic member 8 is a compression spring, the locking body 72 is provided with an elastic positioning hole groove, and the adjusting movable groove 61 is provided with an elastic fitting groove 65. The two ends of the elastic member 8 are respectively inserted into the elastic positioning hole groove and the elastic fitting groove 65.

[0036] In this embodiment, the adjusting groove 61 is recessed and has an unlocking groove 66 at its front end. The locking member 7 also includes an unlocking mating part 75 connected to the front end of the locking body 72 and a linkage protrusion 76 connected to the locking body 72 and corresponding to the locking port 62. The adjusting groove 51 is provided with a linkage groove 53. The linkage protrusion 76 is always inserted into the linkage groove 53. The linkage groove 53 is provided with a locking reset linkage surface 54 at its front end, and an unlocking linkage inclined surface 55 and a forward movement linkage surface 56 at its rear end. The forward movement linkage surface 56 is connected to the rear end of the unlocking linkage inclined surface 55.

[0037] After the locking tooth 71 engages with the last gear slot 52, the adjusting slide 5 continues to move forward via the lumbar support 2. During this process, the unlocking linkage inclined surface 55 first pushes against the linkage protrusion 76, causing the linkage protrusion 76 to rotate in the direction of retracting the adjusting movable slot 61 with the rotation guide part 64 as the rotation axis, thus disengaging the locking tooth 71 from the last gear slot 52. At this time, the elastic member 8 is compressed. Then, the forward moving linkage surface 56 pushes against the linkage protrusion 76, causing the locking member 7 to move forward relative to the adjusting base 6 until the unlocking mating part 75 is inserted into the unlocking slot 66, preventing the locking member 7 from being rotated forward. The guide part 64 rotates in the direction of extending the adjustment movable groove 61 along the rotation axis, keeping the locking protrusion 71 in the state of being disengaged from the gear slot 52; then the adjustment slide 5 is pushed backward, and when the locking reset linkage surface 54 presses against the linkage protrusion 76, the locking member 7 is pushed to move backward relative to the adjustment base 6 until the unlocking engagement part 75 disengages from the unlocking groove 66. At this time, the elastic member 8 unfolds and drives the locking member 7 to rotate in the direction of extending the adjustment movable groove 61 along the rotation guide part 64, so that the locking protrusion 71 can be engaged in the first gear slot 52, locking the position of the adjustment slide 5 relative to the adjustment base 4.

[0038] In this embodiment, the locking body 72, the locking tooth 71, the linkage protrusion 76 and the unlocking engagement part 75 are integrally formed, and the linkage protrusion 76 is connected to the top of the locking tooth 71.

[0039] In this embodiment, the adjusting slide 5 is provided with slide grooves 57 extending from front to back on both the left and right sides. The adjusting base 4 is integrally formed with a guide seat 41, and the guide seat 41 is integrally formed with a guide rail part 42 that slides into the slide groove 57, so that the adjusting slide 5 can be moved back and forth and guided to fit on the adjusting base 4.

[0040] In this embodiment, the adjusting base 4 and the seat 3 are fixedly connected by bolts. The bottom of the adjusting base 4 is provided with a fixing groove 43, and the upper end of the adjusting base 6 is fixed in the fixing groove 43. The adjusting base 6 and the adjusting base 4 are fixedly connected by bolts.

[0041] In a preferred embodiment, the chair back frame 1 is provided with a hinge seat 9 on the front side of the middle part, and the upper end of the lumbar support frame 2 is provided with a transverse hinge shaft 21 that is rotatably connected to the hinge seat 9.

[0042] Furthermore, the lumbar support frame 2 includes two lumbar side supports 22, a lumbar bottom support 23 integrally formed and connected to the lower ends of the two lumbar side supports 22 at its left and right ends respectively, and a lumbar connecting part 24 integrally formed and connected to the bottom of the lumbar bottom support 23. The upper inner side of each lumbar side support 22 is integrally formed and connected to the transverse hinge shaft 21. The upper end of each lumbar side support 22 has a side support limiting part 25 protruding rearward. The front end of the chair back frame 1 is provided with a hinge recess 11. One end of the connector 9 is installed in the hinge recess 11. The hinge connector 9 is fixedly connected to the chair back frame 1 by bolt connection. The hinge connector 9 has a transverse hinge hole 91 on the side facing the lumbar support 22. The side support limiting part 25 is movably inserted into the hinge recess 11 to limit the upper end of the lumbar support 22 from moving away from the hinge connector 9. The transverse hinge shaft 21 is inserted into the transverse hinge hole 91 to achieve the purpose of hinged lumbar support 2 to the chair back frame 1.

[0043] Furthermore, the lumbar support connecting part 24 is connected to the adjusting slide 5. The bottom of the adjusting slide 5 is provided with two insert seats 58 arranged opposite each other. The insert seat 58 is provided with a lumbar support slot 581. The front end of the lumbar support slot 581 is an insert limiting surface for restricting the lumbar support connecting part 24 from being inserted further, and the rear end is a snap-fit ​​insertion port for the lumbar support connecting part 24 to be inserted. The left and right ends of the lumbar support connecting part 24 are respectively inserted into the lumbar support slots 581 of the two insert seats 58. There are two snap-fit ​​connection structures between the lumbar support connecting part 24 and the adjusting slide 5 to position them to each other. The snap-fit ​​connection structures are arranged from left to right.

[0044] Furthermore, the buckle connection structure includes a buckle groove 241 on the lumbar support connecting part 24 and a buckle hook 59 for buckling with the buckle groove 241. The adjusting slide 5 is provided with a buckle clearance groove. The buckle body of the buckle hook 59 is located in the buckle clearance groove and is integrally formed and connected with the adjusting slide 5. The buckle part of the buckle hook 59 protrudes below the buckle clearance groove. The front groove surface of the buckle groove 241 is a buckle limiting surface. The rear end of the buckle part of the buckle hook 59 is provided with a buckle guide surface that allows the lumbar support connecting part 24 to push the buckle hook 59 into the buckle clearance groove and a buckle adapter surface for cooperating with the buckle limiting surface.

[0045] During installation, align the left and right ends of the lumbar support connecting part 24 with the buckle insertion port, and then push the lumbar support connecting part 24 forward to make it snap into the lumbar support slot 581. The buckle hook 59 can snap into the buckle groove 241, so that the buckle adapter surface corresponds to the buckle limiting surface. In this way, the insertion limiting surface and the buckle limiting surface are used to prevent the lumbar support connecting part 24 from disengaging from the lumbar support slot 581, thus completing the buckle installation of the lumbar support connecting part 24. It is simple and convenient.

[0046] The above description is only a preferred embodiment of the present utility model. Any technical solution that achieves the purpose of the present utility model by essentially the same means shall fall within the protection scope of the present utility model.

Claims

1. A linkage-type lumbar support adjustment structure, comprising a backrest frame (1), a lumbar support frame (2), and a seat (3), wherein the lower end of the backrest frame (1) is connected to the seat (3), and the upper end of the lumbar support frame (2) is rotatably connected to the backrest frame (1), characterized in that: The chair seat (3) is provided with an adjustable base (4), and the lower end of the lumbar support (2) is provided with an adjustable slide (5) that can be moved back and forth and is guided and fitted on the adjustable base (4). The adjustable slide (5) is provided with an adjustable groove (51), and the adjustable groove (51) is provided with a plurality of position slots (52) arranged along the moving direction of the adjustable slide (5). The adjustable base (4) is provided with an adjustable base (6) that extends into the adjustable groove (51). The adjustable base (6) is provided with a locking member (7) that is movably connected to the adjustable base (6) and an elastic member (8) for driving the locking member (7) to engage in the position slot (52). The two ends of the elastic member (8) are respectively connected to the adjustable base (6) and the locking member (7).

2. The linkage-type lumbar support adjustment structure according to claim 1, characterized in that: The adjustment base (6) is provided with an adjustment groove (61). A locking port (62) is provided on one side of the adjustment groove (61) and faces the gear slot (52). The locking member (7) and the elastic member (8) are both located in the adjustment groove (61). A rotating groove (63) is recessed in the adjustment groove (61) and located at its rear end. One end of the locking member (7) can move back and forth and rotate and swing in the rotating groove (63). The locking member (7) includes a locking tooth (71) with a corresponding locking port (62). When the locking tooth (71) is engaged in any gear slot (52), it forms a locking position.

3. The linkage-type lumbar support adjustment structure according to claim 2, characterized in that: The rotating groove (63) is provided with a rotating guide part (64), and the locking member (7) also includes a locking body (72). The rear end of the locking body (72) is inserted into the rotating groove (63) and a rotating guide groove (73) with a corresponding rotating guide part (64) is provided on one side. The rotating guide part (64) is inserted into the rotating guide groove (73). There is a locking movement vacancy between the rotating guide part (64) and the rotating guide groove (73) for the locking member (7) to move back and forth and rotate relative to the adjusting base (6).

4. The linkage-type lumbar support adjustment structure according to claim 3, characterized in that: The elastic element (8) is a compression spring. The locking body (72) is provided with an elastic positioning hole groove. The adjusting movable groove (61) is provided with an elastic fitting groove (65). The two ends of the elastic element (8) are respectively inserted into the elastic positioning hole groove and the elastic fitting groove (65).

5. A linkage-type lumbar support adjustment structure according to any one of claims 2-4, characterized in that: The adjusting groove (61) is recessed and has an unlocking groove (66) at its front end. The locking member (7) also includes an unlocking mating part (75) connected to the front end of the locking body (72) and a linkage protrusion (76) connected to the locking body (72) and corresponding to the locking port (62). The adjusting groove (51) is provided with a linkage groove (53). The linkage protrusion (76) is always inserted into the linkage groove (53). The linkage groove (53) is provided with a locking reset linkage surface (54) at its front end, and an unlocking linkage inclined surface (55) and a forward movement linkage surface (56) at its rear end.

6. A linkage-type lumbar support adjustment structure according to any one of claims 1-4, characterized in that: The adjusting slide (5) has a slide groove (57) extending from front to back on the left and / or right sides. The adjusting base (4) has a guide seat (41) and a guide rail (42) that slides into the slide groove (57).

7. A linkage-type lumbar support adjustment structure according to any one of claims 1-4, characterized in that: The chair back frame (1) has a hinge seat (9) on the front side of the middle part, and the upper end of the lumbar support frame (2) has a transverse hinge shaft (21) that can be rotatably connected to the hinge seat (9).

8. The linkage-type lumbar support adjustment structure according to claim 7, characterized in that: The lumbar support frame (2) includes two lumbar side supports (22), a lumbar bottom support (23) connected to the lower ends of the two lumbar side supports (22) at the left and right ends respectively, and a lumbar connecting part (24) connected to the bottom of the lumbar bottom support (23). The upper inner side of the lumbar side supports (22) is connected to the transverse hinge shaft (21). The front end of the chair back frame (1) is provided with a hinge recess (11). One end of the hinge seat (9) is installed in the hinge recess (11). The hinge seat (9) is provided with a transverse hinge hole (91) on the side facing the lumbar side support (22). The lumbar connecting part (24) is connected to the adjusting slide (5).

9. The linkage-type lumbar support adjustment structure according to claim 8, characterized in that: The upper end of the lumbar support (22) protrudes backward with a side support limiting part (25), which is movably inserted into the hinge recess (11).

10. The linkage-type lumbar support adjustment structure according to claim 8, characterized in that: The bottom of the adjusting slide (5) is provided with two insert seats (58) arranged opposite to each other, and the insert seats (58) are provided with waist support slots (581); the left and right ends of the waist support connecting part (24) are respectively inserted into the waist support slots (581) of the two insert seats (58), and the waist support connecting part (24) and the adjusting slide (5) are provided with a snap-fit ​​connection structure to position them together.

Images