Office chair with multi-stage adjustable waist rest structure

Abstract

The utility model discloses an office chair with a multi-stage adjustable waist rest structure. The office chair comprises a chair seat, a chair back and a waist rest assembly arranged on the chair back, the waist rest assembly comprises a waist rest body and an adjusting supporting mechanism. The adjusting and supporting mechanism comprises a gear adjusting piece, a locking rod, an elastic piece and a movable sleeve piece. And the movable suite is connected to the chair back in a sliding manner. And the waist rest main body is hinged to the movable sleeve piece. A plurality of gear clamping grooves are formed in the bottom of the movable suite. The locking rod is inserted into or separated from the gear clamping groove in the movable sleeve piece, and then locking or unlocking of adjustment of the waist rest body is achieved. Meanwhile, the elastic piece is arranged on the movable sleeve piece, so that the movable sleeve piece is pushed to automatically move outwards when the locking rod is unlocked until the waist rest body abuts against the waist of the user, the adjusting mode that a rotary knob needs to be rotated many times is omitted, and convenience is improved.

Description

Technical Field

[0001] This utility model belongs to the field of office furniture technology, specifically relating to an office chair with a multi-level adjustable lumbar support structure. Background Technology

[0002] Some office chairs on the market now include lumbar support adjustment modules, allowing the seat back to better conform to the curve of the human waist and provide comfortable lumbar support. However, current lumbar support adjustment mechanisms are complex in structure, take up a lot of space, and require a large amount of space in the seat back.

[0003] Chinese patent publication number "CN217658870U" discloses a lumbar support for an office chair backrest. Its features include a lumbar support plate assembly and a lumbar support frame connected to the lumbar support plate assembly. The lumbar support frame includes an adjustable support seat connected to the lumbar support plate assembly and a support leg connected to the adjustable support seat. The support leg is connected to the backrest of the office chair. The adjustable support seat includes a fixed sleeve, a movable inner sleeve disposed within the fixed sleeve, and a screw assembly threadedly connected to the movable inner sleeve. The end of the movable inner sleeve is connected to the lumbar support plate assembly. A linear guide mechanism is provided between the movable inner sleeve and the fixed sleeve, and the movable inner sleeve is driven to move along the linear guide mechanism by rotating the screw assembly.

[0004] The aforementioned patent describes a method that uses a rotating screw assembly to drive the movable inner sleeve to move along a linear guide mechanism, thereby moving the lumbar support assembly back and forth. However, this adjustment method requires the lumbar support position to be pre-adjusted before sitting on the office chair. Furthermore, the screw assembly in this structure uses a rotating knob for adjustment, which requires multiple rotations to achieve a noticeable adjustment effect, lacking convenience. Utility Model Content

[0005] To overcome the shortcomings of existing technology, this utility model provides an office chair with a multi-level adjustable lumbar support structure to solve the technical problem of cumbersome and laborious lumbar support adjustment in office chairs.

[0006] To achieve the above objectives, the specific technical solution of this utility model is as follows:

[0007] An office chair with a multi-level adjustable lumbar support structure includes a seat, a backrest, and a lumbar support assembly mounted on the backrest. The lumbar support assembly includes a lumbar support body and an adjustment support mechanism.

[0008] The adjustable support mechanism includes a gear adjustment component, a locking lever, an elastic element, and a movable assembly. The movable assembly is slidably connected to the chair back. The lumbar support body is hinged to the movable assembly.

[0009] The movable assembly has a locking slot at its bottom. Multiple shift slots, which engage with the locking lever, are formed on the side wall of the locking slot. The inner end of the locking lever extends into the locking slot and can be inserted into or disengaged from the shift slots by the shift adjustment component, thereby locking or unlocking the movable assembly. The elastic element is used to push the movable assembly outward when the locking lever is unlocked.

[0010] Furthermore, the locking rod has an L-shaped structure.

[0011] Furthermore, the adjustment support mechanism also includes an adjustment knob. The adjustment knob is rotatably connected to the chair back and is used to drive the gear adjustment component to rotate.

[0012] Furthermore, a connecting protrusion is provided on the inner wall of the adjustment knob. A clearance groove is provided on the chair back to cooperate with the connecting protrusion. The connecting protrusion passes through the clearance groove and is fixed to the gear adjustment component.

[0013] Furthermore, the inner ring of the adjustment knob has a mating groove. A torsion spring is installed within the mating groove. The outer end of the torsion spring is fixed to the chair back.

[0014] Furthermore, the outer wall of the movable kit is provided with multiple guide rods. The chair back is provided with multiple guide grooves that mate with the guide rods. Each guide rod is slidably connected within its corresponding guide groove.

[0015] Furthermore, the outer end of the active kit is provided with an integrally formed support bracket. The lumbar support body is hinged to the support bracket.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] This invention features multiple adjustable slots at the bottom of the movable kit. The lumbar support body can be locked or unlocked by inserting or disengaging a locking lever into these slots. Furthermore, an elastic element on the movable kit allows it to automatically move outwards when the locking lever is unlocked, stopping when the lumbar support body rests against the user's lower back. This eliminates the need for multiple knob adjustments, improving convenience. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is an exploded view of the lumbar support body and the adjusting support mechanism of this utility model;

[0020] Figure 3 This is a schematic diagram of the locking rod and movable assembly in this utility model. Figure 2 (Enlarged view of part A in the middle)

[0021] Figure 4 This is a schematic diagram showing the relative positions of the locking rod and the movable kit in the locked state of this utility model.

[0022] Reference numerals in the attached drawings: 1. Seat; 2. Backrest; 3. Lumbar support body; 4. Adjustment support mechanism; 5. Adjustment knob; 6. Gear adjustment component; 7. Locking rod; 8. Movable kit; 9. Locking slot; 10. Gear slot; 11. Guide rod; 12. Support bracket. Detailed Implementation

[0023] In the description of this utility model, it should be understood that the terms "one end", "the other end", "outer side", "upper side", "inner side", "horizontal", "coaxial", "center", "end", "length", "outer end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] like Figure 1 and 2 As shown, an office chair with a multi-level adjustable lumbar support structure includes a seat 1, a backrest 2, and a lumbar support assembly mounted on the backrest 2. The lumbar support assembly includes a lumbar support body 3 and an adjustment support mechanism 4. The lumbar support body 3 is hinged to the moving end of the adjustment support mechanism 4, allowing it to move inward or outward when driven by the adjustment support mechanism 4 and lock when adjusted to the desired position, thus meeting the needs of different individuals for the position of the lumbar support body 3.

[0026] The specific structure is as follows: Figure 2 and 3 As shown, the adjustment support mechanism 4 includes an adjustment knob 5, a gear adjustment component 6, a locking lever 7, and a movable assembly 8. The adjustment knob 5 is rotatably connected to the chair back 2, and its rotation causes the gear adjustment component 6 to rotate synchronously. The locking lever 7 is fixed to the gear adjustment component 6. An adjustment groove is provided on the chair back 2 to cooperate with the movable assembly 8. The movable assembly 8 is slidably connected within the adjustment groove. A locking slot 9 is provided at the bottom of the movable assembly 8. Multiple gear slots 10 are provided on the side wall of the locking slot 9 to cooperate with the locking lever 7. The inner end of the locking lever 7 extends into the locking slot 9 and can switch between insertion and disengagement from the gear slots 10 under the drive of the adjustment knob 5, thereby locking or unlocking the movable assembly 8.

[0027] In use, when the locking lever 7 is inserted into the gear position slot 10, it can lock the position of the movable component 8. When the locking lever 7 is disengaged from the gear position slot 10, the movable component 8 is unlocked and can slide inward or outward in the adjustment groove.

[0028] like Figure 3 and 4 As shown, the locking lever 7 has an L-shaped structure, consisting of an inner connecting part and an outer locking part. When the adjusting knob 5 drives the locking lever 7 to move, the connecting part of the locking lever 7 and the outer groove wall of the locking slot 9 limit the outward movement of the locking lever 7 to its extreme position. At the same time, the locking part of the locking lever 7 switches between inserting into or disengaging from the position slot 10 under the drive of the adjusting knob 5.

[0029] Furthermore, the movable kit 8 has a mounting groove at one end near the locking lever 7. An adjusting spring is installed within the mounting groove. Initially, the adjusting spring is compressed. When the adjusting knob 5 drives the locking lever 7 out of the corresponding position slot 10, the adjusting spring pushes the movable kit 8 outwards until the lumbar support body 3 abuts against the user's waist. Rotating the adjusting knob 5 causes the locking lever 7 to insert into the corresponding position slot 10, thus locking the position of the lumbar support body 3.

[0030] In this embodiment, the adjustment knob 5 is rotatably connected to the chair back 2, and two integrally formed connecting protrusions are provided on its inner wall. The chair back 2 has clearance slots that mate with the connecting protrusions. Both clearance slots are arc-shaped. The connecting protrusions pass through the clearance slots and are fixed to the gear adjustment member 6 by screws.

[0031] Furthermore, the inner ring of the adjustment knob 5 has a mating groove. A torsion spring is installed in the mating groove. The outer end of the torsion spring is fixed to the chair back 2. When the user rotates the adjustment knob 5, the torsion spring deforms. When the user removes the force applied to the adjustment knob 5, the torsion spring returns to its original position and drives the adjustment knob 5 to rotate back to its original position, so that the locking part of the locking rod 7 installed on the adjustment knob 5 can automatically insert into the corresponding gear slot 10.

[0032] In this embodiment, multiple guide rods 11 are provided on the outer wall of the movable kit 8. Each guide rod 11 is integrally formed with the movable kit 8 and is evenly distributed circumferentially around the axis of the movable kit 8. Multiple guide grooves that cooperate with the guide rods 11 are formed on the inner wall of the adjusting slide. Each guide rod 11 is slidably connected in the corresponding guide groove to ensure that the movable kit 8 slides linearly.

[0033] In addition, in this embodiment, the outer end of the movable kit 8 is provided with an integrally formed support bracket 12. The lumbar support body 3 is hinged to the support bracket 12.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An office chair having a multi-stage adjustable lumbar support structure comprising a seat (1), a backrest (2), and a lumbar support assembly mounted on the backrest (2); the lumbar support assembly comprising a lumbar support body (3) and an adjustment support mechanism (4), characterised in that: The adjusting support mechanism (4) comprises a gear adjusting part (6), a locking rod (7), an elastic part and a movable sleeve (8); the movable sleeve (8) is slidingly connected to the backrest (2); the waist support body (3) is hingedly arranged on the movable sleeve (8); A locking slot (9) is formed in the bottom of the movable sleeve (8); a plurality of gear clamping grooves (10) are formed in the sidewall of the locking slot (9) and matched with the locking rod (7); the inner end of the locking rod (7) extends into the locking slot (9) and can be inserted into or separated from the gear clamping groove (10) under the driving of the gear adjusting part (6), thereby realizing the locking or unlocking of the movable sleeve (8); the elastic part is used for pushing the movable sleeve (8) to move outward when the locking rod (7) is unlocked.

2. An office chair having a multi-stage adjustable lumbar support structure according to claim 1, wherein: The locking rod (7) has an L-shaped structure.

3. An office chair having a multi-stage adjustable lumbar support structure as claimed in claim 1, wherein: The adjusting support mechanism (4) further comprises an adjusting knob (5); the adjusting knob (5) is rotationally connected to the backrest (2) and used for driving the gear adjusting part (6) to rotate.

4. An office chair having a multi-stage adjustable lumbar support structure according to claim 3, wherein: A connecting convex part is arranged on the inner wall of the adjusting knob (5); a giving-way through slot matched with the connecting convex part is formed in the backrest (2); the connecting convex part passes through the giving-way through slot and is fixed with the gear adjusting part (6).

5. An office chair having a multi-stage adjustable lumbar support structure as claimed in claim 3, wherein: A matching recess is formed in the inner ring of the adjusting knob (5); a torsion spring is arranged in the matching recess; the outer end of the torsion spring is fixed with the backrest (2).

6. An office chair having a multi-stage adjustable lumbar support structure as claimed in claim 1, wherein: A plurality of guide rods (11) are arranged on the outer wall of the movable sleeve (8); a plurality of guide sliding grooves matched with the guide rods (11) are formed in the backrest (2); each guide rod (11) is slidingly connected to the corresponding guide sliding groove.

7. An office chair having a multi-stage adjustable lumbar support structure as claimed in claim 1, wherein: An integrally-formed supporting bracket (12) is arranged at the outer end of the movable sleeve (8); the waist support body (3) is hingedly arranged on the supporting bracket (12).

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