External chair back lifting adjusting structure

Abstract

The utility model discloses an external chair back lifting adjusting structure which comprises a supporting piece, a connecting sleeve and a lifting adjusting device, the lifting adjusting device comprises a gear adjusting plate and a positioning buckle assembly, the gear adjusting plate is fixed on the supporting piece, the connecting sleeve is arranged on the outer side of the supporting piece and the gear adjusting plate in a sleeving mode, and the positioning buckle assembly is arranged on the connecting sleeve. The positioning buckle assembly is fixed to the connecting sleeve, a plurality of clamping teeth are arranged on the gear adjusting plate, and the positioning buckle assembly can be matched with the clamping teeth. By arranging the connecting sleeve, the chair can be directly connected with the chair back through the connecting sleeve, so that the connection between the whole structure and the chair back is realized, a corresponding matching structure does not need to be processed on the chair back, the installation of the whole structure on the chair back is greatly simplified, and the whole processing difficulty is reduced; meanwhile, the whole structure is arranged externally, and the overall application range can be greatly widened. By arranging the gear adjusting plate and the positioning buckle, lifting adjustment of the connecting sleeve and the chair back connected with the connecting sleeve can be facilitated, and corresponding use requirements are met.

Description

Technical Field

[0001] The utility model belongs to the field of seats, and in particular relates to an external chair back lifting and adjusting structure. Background Art

[0002] Chairs, especially office chairs, generally have backrests. To facilitate use by people of different heights and provide support for the waist, many existing chair backrests have adjustable lift functions. For example, application No. 201820597515.8 discloses a lift adjustment mechanism for a chair back. However, this type of structure requires machining and reserving corresponding structures and space on the chair back during installation. This requires corresponding machining of the chair back, which increases the overall cost and limits its scope of application to a certain extent. Utility Model Content

[0003] The purpose of the present utility model is to provide an external chair back lifting and adjusting structure that can solve at least one of the above problems.

[0004] According to one aspect of the present invention, an external chair back lifting and adjustment structure is provided, including a support member, a connecting sleeve and a lifting and adjustment device, the lifting and adjustment device includes a gear adjustment plate and a positioning buckle assembly, the gear adjustment plate is fixed on the support member, the connecting sleeve is sleeved on the outside of the support member and the gear adjustment plate, the positioning buckle assembly is fixed on the connecting sleeve, and a plurality of teeth are provided on the gear adjustment plate, and the positioning buckle assembly can cooperate with the teeth.

[0005] The beneficial effects of the present invention are as follows: by providing a connecting sleeve, the connecting sleeve can be directly connected to the chair back, achieving the connection between the entire structure and the chair back, making the entire structure external, without the need to process corresponding matching structures on the chair back, greatly simplifying the installation of the entire structure on the chair back, thereby reducing the overall processing difficulty and helping to reduce processing costs; at the same time, the external placement of the entire structure can greatly expand the overall scope of application. By providing a gear adjustment plate and a positioning buckle, the connecting sleeve and the chair back connected to the connecting sleeve can be easily adjusted to meet the corresponding usage requirements.

[0006] In some embodiments, the positioning clip assembly includes a mounting frame, a clip, and a spring. A mounting slot is provided on one side of the mounting frame, the clip is positioned within the slot, one end of the spring abuts against the sidewall of the slot, and the other end abuts against the clip. The clip is provided with a protrusion that engages with a tooth. Thus, through the various structures of the positioning clip assembly, the tooth facilitates the positioning of the protrusion, thereby facilitating the definition of the height position of the mounting frame and the connecting sleeve.

[0007] In some embodiments, the external seat back lift adjustment structure further includes a sleeve, which is mounted on the outside of the support member and the gear adjustment plate. The connecting sleeve is mounted on the outside of the sleeve, and the protrusion can penetrate the sleeve and engage with the latch. Thus, the sleeve can improve the integrity of the support member.

[0008] In some embodiments, the external seat back lift adjustment structure further includes a limiting sleeve, which is mounted on the outside of the sleeve, and a connecting sleeve, which is mounted on the outside of the limiting sleeve. The protrusion can penetrate the limiting sleeve and the sleeve and then engage with the latching teeth. The top of the limiting sleeve is provided with a limiting edge, and the top of the connecting sleeve abuts the limiting edge. Therefore, the provision of the limiting sleeve can facilitate the installation of the connecting sleeve on the sleeve and facilitate the raising and lowering of the connecting sleeve.

[0009] In some embodiments, mounting plates are provided at both ends of the connecting sleeve, the mounting plates and the connecting sleeve are integrally formed, and the mounting plates are provided with first mounting holes. Thus, the first mounting holes facilitate the installation of the connecting sleeve on the chair back.

[0010] In some embodiments, the external seat back lift adjustment structure further includes a fixing plate, a retaining post disposed on the other side of the mounting frame, and a vertically disposed fixing plate. The fixing plate includes a through hole, the retaining post engaging the through hole, and a second mounting hole. The fixing plate thus enhances the stability of the connection sleeve on the seat back and increases the strength of the connection.

[0011] In some embodiments, the external seat back lift adjustment structure further includes a reinforcement plate, the gear adjustment plate and the reinforcement plate are respectively located on either side of the support member, and the reinforcement plate is located within the sleeve. Thus, by providing the reinforcement plate, the support strength of the support member can be increased.

[0012] In some embodiments, a connecting post is provided on the inner side of the reinforcing plate, which can penetrate the support member and then connect to the gear adjustment plate. Folding edges are provided on both sides of the reinforcing plate, which wrap around the outer side of the support member. Thus, the provision of the folding edges facilitates the limited installation of the reinforcing plate on the support member and also improves the stability of the sleeve installation.

[0013] In some embodiments, the gear adjustment plate has multiple latches, each with a reset groove on one side, into which the protrusion engages. Thus, by providing the reset groove, when the protrusion is located within the reset groove, it can rise to the latches at different heights, thereby facilitating the entire positioning buckle assembly to lower the seat back to its lowest position.

[0014] In some embodiments, the external chair back lift adjustment structure further includes an end cap, which is disposed on the top end of the sleeve. Thus, the end cap can improve the integrity of the entire support member. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of the external chair back lifting and adjusting structure of the utility model;

[0016] Figure 2 This is a structural diagram of the external chair back lifting and adjusting structure of the utility model from another perspective;

[0017] Figure 3 This is a schematic diagram of the exploded structure of the external chair back lifting and adjusting structure of the utility model;

[0018] Figure 4 This is a schematic structural diagram of the lifting and adjusting device in the external chair back lifting and adjusting structure of the present invention;

[0019] Figure 5 It is a structural schematic diagram of the positioning buckle assembly in the external chair back lifting and adjusting structure of the present invention. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the accompanying drawings.

[0021] Reference Figures 1-5 The external chair back lift adjustment structure includes a support member 1, a connecting sleeve 2, and a lift adjustment device 3. The lift adjustment device 3 includes a gear adjustment plate 31 and a positioning buckle assembly 32. The gear adjustment plate 31 is fixed to the support member 1. The connecting sleeve 2 is mounted outside the support member 1 and the gear adjustment plate 31. The positioning buckle assembly 32 is fixed to the connecting sleeve 2. The gear adjustment plate 31 is provided with a plurality of latches 311, and the positioning buckle assembly 32 can cooperate with the latches 311. Among them, multiple latches 311 are provided along the height position of the gear adjustment plate 31, which facilitates the multi-level height adjustment of the chair back to meet different usage requirements.

[0022] When in use, the externally mounted seatback lift adjustment structure of the present invention comprises an L-shaped support member 1, the bottom end of which is fixed to the seat base, and a connecting sleeve 2 fixed to the seatback. The connecting sleeve 2 can be raised and lowered along the support member 1 and positioned at a desired height via a lift adjustment device 3. Specifically, when the seatback needs to be raised or lowered, the positioning clip assembly 32 moves with the support member 1. When the seatback is adjusted to the desired height, the positioning clip assembly 32 engages with the latch 311 on the gear adjustment plate 31, and the latch 311 limits and secures the positioning clip assembly 32, thereby adjusting the connecting sleeve 2 and the seatback to the desired height.

[0023] The positioning buckle assembly 32 includes a mounting frame 321, a buckle 322, and a spring 323. A mounting slot 324 is defined on one side of the mounting frame 321, and the buckle 322 is positioned within the slot. One end of the spring 323 abuts the sidewall of the slot 324, while the other end abuts the buckle 322. The buckle 322 is provided with a protrusion 325 that engages with the latch 311. The buckle 322 and protrusion 325 are integrally formed. A reset slot 312 is defined on one side of the latch 311, and the protrusion 325 engages with the reset slot 312. The upper end surface of the latch 311 can be horizontal, while the lower end surface can be inclined.

[0024] Therefore, when the chair back needs to be adjusted upward, an external force pulls the chair back, causing the chair back to act on the mounting frame 321 of the positioning buckle assembly 32. The mounting frame 321 drives the buckle 322 upward. At this time, the lower end surface of the latch 311 acts on the protrusion 325, pushing the protrusion 325 and the entire buckle 322 to swing, and the buckle 322 compresses the spring 323. When the protrusion 325 moves to the reset groove 312, the latch 311 releases the restraining effect on the protrusion 325, allowing the chair back to move upward. When the chair back is moved to the desired height, the buckle 322 swings toward the latch due to the rebound effect of the spring 323, causing the protrusion 325 to move onto the latch 311. The latch 311 then positions and fixes the protrusion 325, preventing it from sliding down. This effectively limits and fixes the chair back, keeping it at the desired height.

[0025] The external seat back lift adjustment structure of the present invention further includes a sleeve 4, which is sleeved onto the outside of the support member 1 and the gear adjustment plate 31. The connecting sleeve 2 is sleeved onto the outside of the sleeve 4. The protrusion 325 can penetrate the sleeve 4 and engage with the latch 311. The sleeve 4 can protect the gear adjustment plate 31 and improve its integrity.

[0026] The external chair back lift adjustment structure also includes a limiting sleeve 5, which is mounted on the outside of the sleeve 4. The connecting sleeve 2 is mounted on the outside of the limiting sleeve 5. The protrusion 325 can penetrate the limiting sleeve 5 and the sleeve 4 and then engage with the latch 311. The top of the limiting sleeve 5 is folded outward to form a limiting edge 51, and the top of the connecting sleeve 2 abuts the limiting edge 51. The limiting sleeve 5 can facilitate the connecting sleeve 2 to be better mounted on the sleeve 4, facilitating the lifting and lowering movement along the support member 1. At the same time, it avoids direct contact between the connecting sleeve 2 and the sleeve 4, reducing friction and increasing the service life of the connecting sleeve 2.

[0027] Mounting plates 21 are provided at both ends of the connecting sleeve 2. The mounting plates 21 and the connecting sleeve 2 are integrally formed, and a first mounting hole 211 is defined in the mounting plates 21. The mounting plates 21 facilitate attachment to the back of the chair. External screws, for example, are then inserted through the first mounting holes 211 to secure the connecting sleeve 2 to the chair back.

[0028] The externally mounted seatback lift adjustment mechanism also includes a fixing plate 6. A retaining post 326 is provided on the other side of the mounting frame 321. The fixing plate 6 is vertically arranged and has a through-hole formed therein. The retaining post 326 engages with the through-hole and a second mounting hole 61 is provided on the fixing plate 6. The retaining post 326 and the mounting frame 321 are integrally formed. The retaining post 326 allows for quick positioning and securing of the fixing plate 6 to the mounting frame 321. The second mounting hole 61 facilitates secure connection to the seatback.

[0029] The external chair back lift adjustment structure of the present invention further includes a reinforcing plate 7. The gear adjustment plate 31 and the reinforcing plate 7 are respectively located on both sides of the support member 1, and the reinforcing plate 7 is located in the sleeve 4. The reinforcing plate 7 can increase the strength of the support member 1 where the gear adjustment plate 31 is fixed.

[0030] A connecting post 71 is integrally formed on the inner side of the reinforcing plate 7. The connecting post 71 can penetrate the support member 1 and connect to the gear adjustment plate 31. Folding edges 72 are provided on both sides of the reinforcing plate 7, and the folding edges 72 wrap around the outer side of the support member 1. Threaded holes are provided in the connecting post 71. Therefore, when the reinforcing plate 7, support member 1, and gear adjustment plate 31 are assembled, screws are screwed into one side of the gear adjustment plate 31 and locked into the threaded holes in the connecting post 71, thereby achieving the installation and fixation of the reinforcing plate 7, support member 1, and gear adjustment plate 31.

[0031] The external chair back lifting and adjusting structure of the present invention further comprises an end cover 8, which is arranged on the top end of the sleeve 4. When the various structures are installed, the end cover 8 is arranged on the top end of the sleeve 4 to improve the integrity of the entire structure.

[0032] The above are only preferred embodiments of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. External seat back lifting and adjusting structure, characterized in that: The invention comprises a support member (1), a connecting sleeve (2) and a lifting and lowering adjustment device (3); the lifting and lowering adjustment device (3) comprises a gear adjustment plate (31) and a positioning buckle assembly (32); the gear adjustment plate (31) is fixed on the support member (1); the connecting sleeve (2) is sleeved on the outside of the support member (1) and the gear adjustment plate (31); the positioning buckle assembly (32) is fixed on the connecting sleeve (2); the gear adjustment plate (31) is provided with a plurality of latch teeth (311); and the positioning buckle assembly (32) can cooperate with the latch teeth (311).

2. The external chair back lift adjustment structure according to claim 1, characterized in that: The positioning buckle assembly (32) includes a mounting frame (321), a buckle (322) and a spring (323). A mounting groove (324) is provided on one side of the mounting frame (321). The buckle (322) is arranged in the mounting groove (324). One end of the spring (323) abuts against the side wall of the mounting groove (324), and the other end abuts against the buckle (322). A protrusion (325) is provided on the buckle (322), and the protrusion (325) can cooperate with the latch tooth (311).

3. The external chair back lift adjustment structure according to claim 2, characterized in that: It also includes a sleeve (4), the sleeve (4) being sleeved on the outside of the support member (1) and the gear adjustment plate (31), the connecting sleeve (2) being sleeved on the outside of the sleeve (4), and the protrusion (325) being capable of penetrating the sleeve (4) and then cooperating with the latching teeth (311).

4. The external chair back lift adjustment structure according to claim 3, characterized in that: It also includes a limiting sleeve (5), the limiting sleeve (5) is sleeved on the outside of the sleeve (4), the connecting sleeve (2) is sleeved on the outside of the limiting sleeve (5), the protrusion (325) can penetrate the limiting sleeve (5) and the sleeve (4) and then cooperate with the latch (311), the top end of the limiting sleeve (5) is provided with a limiting edge (51), and the top end of the connecting sleeve (2) is in contact with the limiting edge (51).

5. The external seat back lifting and adjusting structure according to any one of claims 2 to 4, characterized in that: Mounting plates (21) are provided at both ends of the connecting sleeve (2); the mounting plates (21) and the connecting sleeve (2) are an integrally formed structure; and a first mounting hole (211) is provided on the mounting plates (21).

6. The external chair back lifting and adjusting structure according to claim 5, characterized in that: It also includes a fixing plate (6), a limiting column (326) is provided on the other side of the installation frame (321), the fixing plate (6) is vertically arranged, a through hole is provided on the fixing plate (6), the limiting column (326) cooperates with the through hole, and a second installation hole (61) is provided on the fixing plate (6).

7. The external chair back lifting and adjusting structure according to claim 3 or 4, characterized in that: It also includes a reinforcing plate (7), the gear adjustment plate (31) and the reinforcing plate (7) are respectively located on both sides of the support member (1), and the reinforcing plate (7) is located in the sleeve (4).

8. The external chair back lifting and adjusting structure according to claim 7, characterized in that: A connecting column (71) is provided on the inner side of the reinforcing plate (7), and the connecting column (71) can penetrate the supporting member (1) and be connected to the gear adjustment plate (31). Folding edges (72) are provided on both sides of the reinforcing plate (7), and the folding edges (72) are covered on the outer side of the supporting member (1).

9. The external chair back lift adjustment structure according to claim 7, characterized in that: There are a plurality of latching teeth (311) on the gear adjustment plate (31), and a reset groove (312) is provided on one side of the latching teeth (311). The protrusion (325) can cooperate with the reset groove (312).

10. The external chair back lifting and adjusting structure according to claim 9, characterized in that: It also includes an end cover (8), which is arranged on the top end of the sleeve (4).

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