Adjustable waist supporting chair

Abstract

The utility model relates to the field of chairs, in particular to an adjustable waist supporting chair which comprises a bottom frame and a chair back support, at least one set of elastic waist supporting mechanism is arranged on one face of the chair back support, each elastic waist supporting mechanism comprises a waist supporting piece and an elastic piece located between the waist supporting piece and the chair back support, and the chair back support is arranged on the bottom frame in a lifting mode. A helical tooth groove of a chair back lifting mechanism is arranged between a chair back support and a bottom frame and matched with a limiting block on a gear piece to achieve lifting, specifically, the gear piece is reset through a clamping spring in a rotating groove of the bottom frame, a movable groove is formed in the outer ring of the helical tooth groove, and the clamping spring enables the limiting block to be elastically attached to the helical tooth groove. The gear piece rotates to enable the limiting block to move in the movable groove to achieve multi-gear lifting. The waist supporting device has the advantages that the two sides of the waist are better elastically supported, stable multi-gear height adjustment can be achieved, and therefore supporting adaptive to different waist height positions is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of chairs, in particular to an adjustable waist support chair. Background Art

[0002] Chairs are a common tool used in people's daily lives. According to their classification, they include office chairs, gaming chairs, etc.

[0003] In the related art, in order to improve the comfort of the user's waist when sitting on a chair, some chairs are equipped with lumbar pillows to support the user's waist and reduce the user's fatigue. However, most of the current lumbar pillows are directly fixed to the backrest of the chair, which is difficult to meet the needs of different user groups. For example, some lumbar pillows can provide a better experience for users with a taller height (higher than 175 cm), but the experience is poor for users with a shorter height (less than 160 cm). For another example, some lumbar pillows can provide a better experience for users with a thinner body (weighing less than 50 kg), but the experience is poor for users with a fatter body (weighing more than 70 kg).

[0004] The existing utility model patent application number 202222397322.7 discloses a backrest assembly and a chair. The backrest assembly includes: a backrest bracket; and a lumbar support mechanism. The lumbar support mechanism includes an angle adjustment component provided on the backrest bracket, and a lumbar support component driven by the angle adjustment component. The lumbar support component includes an elastic support unit driven by the angle adjustment component, and a lumbar support member connected to the elastic support unit. The lumbar support member is located on the front side of the backrest bracket. When the backrest assembly of the utility model is in use, the angle of the lumbar support assembly can be adjusted by the angle adjustment component, thereby changing the angle of the lumbar support member. In this way, the lumbar support member can provide better support effects for different user groups, such as users of different heights and body shapes, thereby improving comfort.

[0005] However, although this patent can achieve the elastic lumbar support function, it does not have a relatively stable chair back support lifting function, so it cannot fully adapt to the needs of supporting different lumbar positions. Utility Model Content

[0006] The technical problem to be solved by the present invention is to provide a lumbar support chair that can adapt to different waist height positions by achieving better elastic support on both sides of the waist and realizing relatively stable multi-level height adjustment in response to the deficiencies of the above-mentioned existing technologies.

[0007] To achieve the above-mentioned purpose, the following technical scheme is adopted: an adjustable lumbar support chair, comprising a base frame and a backrest frame, wherein one side of the backrest frame is provided with at least one group of elastic lumbar support mechanisms, the elastic lumbar support mechanism comprising a lumbar support member and an elastic member located between the lumbar support member and the backrest frame, the backrest frame being liftable and arranged on the base frame, a backrest lifting mechanism being provided between the backrest frame and the base frame, the backrest lifting mechanism comprising a plurality of oblique tooth grooves vertically arranged on the side of the backrest frame away from the elastic lumbar support mechanism, the base frame is provided with a rotation groove facing the oblique tooth groove, a gear member is provided for rotation in the rotation groove, a retaining spring is provided between the gear member and the rotation groove, a movable groove is provided on the outer ring of the oblique tooth groove, and a limit block cooperating with the oblique tooth groove is provided at one end of the rotation groove away from the rotation of the gear member, the retaining spring makes the limit block elastically close to the oblique tooth groove, and the rotation of the gear member causes the limit block to move in the movable groove to realize multi-gear lifting and lowering.

[0008] By adopting the above technical solution, the limit block on the gear member is elastically abutted against the bevel groove through the bevel groove, so that when the chair back bracket rises, it will not fall directly, but will be limited by the bevel groove to achieve stable multi-gear positioning. Each bevel groove can be adjusted to 1 gear height, thereby achieving multi-gear adjustment. When the limit block on the gear member reaches the raised bevel tooth end on the bevel groove, the gear member will rotate into the movable groove. When the limit block passes the bevel tooth end and reaches the bevel groove, the elastic force of the retaining spring elastically presses the limit block into the bevel groove, thereby achieving positioning. By continuously pushing up the chair back bracket, the chair back bracket can be raised and lowered on the base frame, and at the same time Since the movable groove is arranged on the outer ring of the bevel groove, when the limit block reaches the top of the bevel groove, since the top of the bevel groove is similar to an inclined plate, the limit block is guided into the movable groove, and the other side of the bevel groove is a vertical plane, so the limit block can be dropped from the other side of the bevel groove to the bottom of the bevel groove. The bevel groove can also be replaced with a bevel tooth block, and multi-stage lifting can be achieved through the bevel groove in a cycle. The cooperation of the limit block and the bevel groove makes the lifting between the chair back support and the base frame more stable, and the lifting is more controllable than that of the hydraulic rod, and can be adjusted to the most comfortable sitting height and waist support height.

[0009] An adjustable lumbar support chair can be further configured as follows: a lifting seat is fixedly provided on the side of the chair back bracket away from the elastic lumbar support mechanism, the oblique tooth groove is provided in the lifting seat, the movable groove is located at the outer circle of the oblique tooth groove provided on the lifting seat, an adjustment seat is fixedly provided on the side of the base frame facing the oblique tooth groove, the lifting seat is provided with sliding grooves located at both ends of the oblique tooth groove, and a slider is protruded on the adjustment seat and extends into the sliding groove and slides axially along the sliding groove track.

[0010] By adopting the above technical solution, the sliders on both sides extend into the slide groove to achieve axial up and down lifting, and the lifting seat is fixed to the seat back bracket by bolts, and the base also fixes the adjustment seat by bolts. The lifting seat and the adjustment seat make the assembly of parts more convenient, and the disassembly of the seat back bracket and the base is also more convenient.

[0011] An adjustable lumbar support chair can be further configured as follows: the rotation groove is fan-shaped, and its two sides limit the rotation range of the gear member; the limit block can be switched between the movable groove and the oblique tooth groove by rotating the gear member; when the limit block reaches the uppermost oblique tooth groove, it can be guided into the movable groove through the top of the oblique tooth groove to realize the lowering of the limit block.

[0012] By adopting the above technical solution, the fan-shaped rotation groove is used to prevent the gear member from excessively rotating, or even causing a 360-degree rotation, which leads to a mismatch with the bevel tooth groove and causes the teeth to be unable to move up and down. When the limit block reaches the top of the bevel tooth groove, the top of the bevel tooth groove is similar to an inclined plate, thereby guiding the limit block into the movable groove. The other side of the bevel tooth groove is a vertical plane, so the limit block can be lowered from the other side of the bevel tooth groove to the bottom of the bevel tooth groove, and multi-gear lifting and lowering can be achieved through the bevel tooth groove in a reciprocating manner.

[0013] An adjustable lumbar support chair can be further configured as follows: adjacent oblique tooth grooves are arranged equidistantly from each other, and the distance between adjacent oblique tooth grooves is 1.5-2 cm.

[0014] By adopting the above technical solution, by setting the height spacing of the bevel tooth grooves to 1.5-2cm, each 1.5-2cm is achieved as one gear, and 5 gears are 7.5-10cm high. If you want to continue to increase it, you can set more bevel tooth grooves. The adjacent bevel tooth grooves are set at equal distances to make the height gear more controllable.

[0015] An adjustable lumbar support chair can be further configured as follows: the lumbar support member includes a first lumbar support member and a second lumbar support member arranged on both sides of a chair back support, at least two elastic members are used between the first lumbar support member and the chair back support to elastically support one side of the waist, and at least two elastic members are used between the second lumbar support member and the chair back support to elastically support the other side of the waist.

[0016] By adopting the above technical solution, elastic support for the waist on both sides is achieved through two waist supporting parts. Each waist supporting part is provided with two elastic parts to achieve stable elastic support. Compared with the support of a single elastic part, it is more stable and not easy to clamp the waist flesh to cause waist pain.

[0017] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of an embodiment of the present utility model.

[0019] Figure 2 For the embodiment of the utility model Figure 1 Schematic diagram of the explosion structure.

[0020] Figure 3 For the embodiment of the utility model Figure 2 Schematic diagram of the structure of the gear parts.

[0021] Figure 4 For the embodiment of the utility model Figure 2 Schematic diagram of the structure of the middle retaining spring.

[0022] Figure 5 For the embodiment of the utility model Figure 2 Schematic diagram of the structure of the middle lifting seat.

[0023] Figure 6 For the embodiment of the utility model Figure 2 Schematic diagram of the structure of the middle adjustment seat.

[0024] Figure 7 For the embodiment of the utility model Figure 2 Front view of the chair back lift mechanism in.

[0025] Figure 8 For the embodiment of the utility model Figure 7 AA section view.

[0026] In the figure: 1. Base frame; 2. Backrest bracket; 3. Elastic lumbar support mechanism; 4. Backrest lifting mechanism; 5. Lifting seat; 31. Lumbar support member; 32. Elastic member; 41. Oblique tooth groove; 42. Rotating groove; 43. Shift member; 44. Retaining spring; 45. Movable groove; 46. Adjusting seat; 51. Slide groove; 52. Sliding block; 53. Limiting block; 311. First lumbar support member; 312. Second lumbar support member. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the protection examples of the present invention.

[0028] Example 1: Figures 1-8An adjustable lumbar support chair is shown, comprising a base frame 1 and a backrest support 2, wherein one side of the backrest support 2 is provided with at least one group of elastic lumbar support mechanisms 3, the elastic lumbar support mechanism 3 comprising a lumbar support member 31 and an elastic member 32 located between the lumbar support member 31 and the backrest support 2, the lumbar support member 31 comprising a first lumbar support member 311 and a second lumbar support member 312 arranged on both sides of the backrest support 2, the first lumbar support member 311 and the backrest support 2 are elastically supported on one side of the waist through at least two elastic members 32, the second lumbar support member 312 and the backrest support 2 are elastically supported on the other side of the waist through at least two elastic members 32, the lumbar support member 31 on each side is more adapted to the curvature of the waist through the elastic member 32, and can fit both sides of the waist.

[0029] like Figure 1 、 Figure 2 、 Figure 7 and Figure 8 As shown, the backrest bracket 2 can be lifted and lowered on the base frame 1, and a backrest lifting mechanism 4 is provided between the backrest bracket 2 and the base frame 1. The backrest lifting mechanism 4 includes a plurality of oblique tooth grooves 41 vertically arranged on the side of the backrest bracket 2 away from the elastic waist support mechanism 3. The adjacent oblique tooth grooves 41 are equidistantly arranged, and the distance between the adjacent oblique tooth grooves 41 is 1.5-2 cm. A lifting seat 5 is fixedly provided on the side of the backrest bracket 2 away from the elastic waist support mechanism 3. The oblique tooth groove 41 is provided in the lifting seat 5. The base frame 1 is provided with a rotation groove 42 on the side facing the oblique tooth groove 41, and a gear member 43 is provided for rotation in the rotation groove 42, as shown in FIG. Figure 5 、 Figure 6 and Figure 8As shown, the rotating groove 42 is fan-shaped, and its two sides limit the rotation range of the gear member 43. A retaining spring 44 is provided between the gear member 43 and the rotating groove 42. A movable groove 45 is provided at the outer ring of the bevel groove 41. The movable groove 45 is located at the outer ring of the lifting seat 5 where the bevel groove 41 is provided. An adjustment seat 46 is fixedly provided on the side of the base frame 1 facing the bevel groove 41. A slide groove 51 is provided on the lifting seat 5 at both ends of the bevel groove 41. A slider 52 is provided on the adjusting seat 46 to extend into the slide groove 51 and slide axially along the track of the slide groove 51. The gear member 43 is provided at one end of the rotating groove 42 away from the rotation and is provided with a slider that cooperates with the bevel groove 41. The limit block 53 can be switched between the movable groove 45 and the oblique tooth groove 41 by rotating the gear member 43. When the limit block 53 reaches the uppermost oblique tooth groove 41, it can be guided into the movable groove 45 through the top of the oblique tooth groove 41 to realize the lowering of the limit block 53. The retaining spring 44 makes the limit block 53 elastically close to the oblique tooth groove 41. The gear member 43 rotates to make the limit block 53 movable in the movable groove 45 to realize multi-gear lifting and lowering. The limit block 53 on the gear member 43 is elastically abutted with the oblique tooth groove 41 through the oblique tooth groove 41, so that when the chair back support 2 rises, it will not fall directly, but will be moved by the oblique tooth groove 41. The slot 41 is limited to achieve stable multi-speed positioning. Each helical tooth slot 41 can be adjusted to 1 gear height, thereby achieving multi-speed adjustment. When the limit block 53 on the gear member 43 reaches the raised helical tooth end on the helical tooth slot 41, the gear member 43 will rotate to the movable slot 45. When the limit block 53 passes the helical tooth end and reaches the helical tooth slot 41, the elastic force of the retaining spring 44 elastically presses the limit block 53 into the helical tooth slot 41, thereby achieving positioning. By continuously pushing up the chair back bracket 2, the chair back bracket 2 is lifted and lowered on the base frame 1. At the same time, since the movable slot 45 is arranged on the outer ring of the helical tooth slot 41, when When the limit block 53 reaches the top of the oblique tooth groove 41, since the top of the oblique tooth groove 41 is similar to an inclined plate, the limit block 53 is guided into the movable groove 45. The other side of the oblique tooth groove 41 is a vertical plane, so the limit block 53 can be lowered from the other side of the oblique tooth groove 41 to the bottom of the oblique tooth groove 41, and the multi-level lifting and lowering can be achieved through the oblique tooth groove 41 repeatedly. Through the cooperation of the limit block 53 and the oblique tooth groove 41, the lifting and lowering between the chair back support 2 and the base frame 1 is more stable. At the same time, compared with the lifting and lowering of the hydraulic rod, it is more controllable and can be adjusted to the most comfortable sitting height and waist support height.

[0030] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An adjustable lumbar support chair, comprising a base frame (1) and a backrest support (2), wherein one side of the backrest support (2) is provided with at least one set of elastic lumbar support mechanisms (3), the elastic lumbar support mechanism (3) comprising a lumbar support member (31) and an elastic member (32) located between the lumbar support member (31) and the backrest support (2), the backrest support (2) being movably mounted on the base frame (1), and characterized in that: A chair back lifting mechanism (4) is provided between the chair back support (2) and the base frame (1). The chair back lifting mechanism (4) includes a plurality of oblique tooth grooves (41) vertically arranged on the side of the chair back support (2) away from the elastic waist supporting mechanism (3). The base frame (1) is provided with a rotation groove (42) on the side facing the oblique tooth groove (41). A gear member (43) is provided in the rotation groove (42) for rotation. A retaining spring (44) is provided between the gear member (43) and the rotation groove (42). A movable groove (45) is provided at the outer ring of the oblique tooth groove (41). A limit block (53) cooperating with the oblique tooth groove (41) is provided at one end of the gear member (43) for rotation away from the rotation groove (42). The retaining spring (44) makes the limit block (53) elastically close to the oblique tooth groove (41). The rotation of the gear member (43) makes the limit block (53) move in the movable groove (45) to realize multi-gear lifting.

2. The adjustable lumbar support chair according to claim 1, characterized in that: The chair back support (2) is fixedly provided with a lifting seat (5) on one side away from the elastic waist supporting mechanism (3), the oblique tooth groove (41) is provided in the lifting seat (5), the movable groove (45) is located at the outer ring of the lifting seat (5) where the oblique tooth groove (41) is provided, and the bottom frame (1) is fixedly provided with an adjustment seat (46) on the side facing the oblique tooth groove (41), the lifting seat (5) is provided with a slide groove (51) located at both ends of the oblique tooth groove (41), and the adjustment seat (46) is provided with a protrusion provided with a slider (52) extending into the slide groove (51) and sliding axially along the track of the slide groove (51).

3. The adjustable lumbar support chair according to claim 1 or 2, characterized in that: The rotating groove (42) is fan-shaped, and the two sides thereof limit the rotation range of the shift member (43). The limit block (53) can be switched between the movable groove (45) and the oblique tooth groove (41) by the rotation of the shift member (43). When the limit block (53) reaches the uppermost oblique tooth groove (41), it can be guided into the movable groove (45) through the top of the oblique tooth groove (41) to realize the lowering of the limit block (53).

4. The adjustable lumbar support chair according to claim 3, characterized in that: Adjacent oblique tooth grooves (41) are arranged at equal distances, and the distance between adjacent oblique tooth grooves (41) is 1.5-2 cm.

5. The adjustable lumbar support chair according to claim 1, characterized in that: The waist supporting member (31) comprises a first waist supporting member (311) and a second waist supporting member (312) arranged on both sides of the chair back support, wherein the first waist supporting member (311) and the chair back support (2) are connected via at least two elastic members (32) to elastically support one side of the waist, and the second waist supporting member (312) and the chair back support (2) are connected via at least two elastic members (32) to elastically support the other side of the waist.

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