A chair back telescoping structure

Abstract

The utility model relates to a kind of chair back telescopic structure, including chair seat and chair back, it is characterized by further including fixed rod, telescopic rod and the locking piece that will telescopic rod and fixed rod are locked, the fixed rod is installed on chair seat, and along the sitting depth direction of chair seat, the rear end of the telescopic rod is connected to chair back, and with chair back synchronous sliding, the front end of telescopic rod is located in fixed rod, and with fixed rod sliding cooperation, the guiding slot is equipped in telescopic rod along the sitting depth direction of chair seat, the front end of the fixed rod is equipped with the opening that is communicated with guiding slot, the locking piece extends to telescopic rod inside by opening and guiding slot, and the rotation of locking piece can lock or unlock telescopic rod to realize the telescopic movement of chair back.Using the above technical scheme, the utility model provides a kind of chair back telescopic structure, can be adjusted according to different user needs, and adjustment structure is simple, convenient to operate.

Description

Technical Field

[0001] This utility model relates to the field of seating technology, and in particular to a retractable chair back structure. Background Technology

[0002] Existing office and student chairs have height adjustment and some can adjust the backrest angle, but none of them have fore-and-aft backrest adjustment or seat depth adjustment. Since different users have different heights and body types, each person needs a different seat depth. Some users cannot lean back against the chair back, which affects their posture and can easily lead to spinal problems and health issues over time. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the prior art by providing a retractable chair back structure that allows for adjustment of the chair back according to the needs of different users. The adjustment structure is simple and easy to operate.

[0004] The technical solution of this utility model is as follows: A telescopic chair back structure includes a seat and a backrest, and further includes a fixed rod, a telescopic rod, and a locking member for locking the telescopic rod and the fixed rod. The fixed rod is installed on the seat along the seat depth direction. The rear end of the telescopic rod is connected to the backrest and slides synchronously with the backrest. The front end of the telescopic rod is located inside the fixed rod and slides in cooperation with the fixed rod. The telescopic rod has a guide groove along the seat depth direction. The front end of the fixed rod has an opening communicating with the guide groove. The locking member extends into the telescopic rod through the opening and the guide groove. The rotation of the locking member can lock or unlock the telescopic rod, thereby realizing the telescopic movement of the chair back.

[0005] Specifically, the locking component includes a locking rod and a locking nut. The locking nut is located outside the fixed rod. One end of the locking rod passes through the locking nut and extends into the telescopic rod, while the other end is provided with a rotating component that presses against the bottom of the locking nut.

[0006] Using the above technical solution, the chair back is connected to the telescopic rod and slides synchronously with it. The telescopic rod slides relative to the fixed rod, thereby causing the chair back to slide relative to the seat, adjusting the seat depth according to the user's needs. The cooperation between the guide groove and the locking part does not hinder the sliding of the telescopic rod, but can also lock it after the telescopic rod slides. By rotating the rotating part, the locking rod is driven to rotate, and the locking rod slides axially relative to the locking nut, locking or unlocking the telescopic rod. The operation is convenient and quick, and rapid adjustment can be achieved.

[0007] A further feature of this invention is that the telescopic rod is provided with a protective component, which includes a return spring and a fixed sleeve and a sliding sleeve located at both ends of the return spring. The fixed sleeve is located at the rear end of the telescopic rod and is fixed to the telescopic rod. When the guide groove protrudes from the fixed rod, the sliding sleeve can slide within the telescopic rod under the action of the return spring and is located within the guide groove.

[0008] With the above-mentioned further configuration, the fixed sleeve and the telescopic rod slide synchronously. When the telescopic rod slides forward and the locking member contacts the rear side wall of the guide groove, the return spring is compressed between the fixed sleeve and the sliding sleeve. When the telescopic rod slides backward, the sliding sleeve will slide inside the telescopic rod under the action of the return spring, blocking the guide groove exposed outside the fixed rod, preventing children's fingers from sticking in and improving safety.

[0009] A further feature of this invention is that the rear end of the fixing sleeve is provided with a connecting piece, which extends to the outside of the telescopic rod and is located at the rear end of the telescopic rod, sliding synchronously with the telescopic rod.

[0010] With the above-mentioned further configuration, the chair back is connected to the telescopic rod via a connecting rod, and the connecting piece is located between the telescopic rod and the connecting rod, so that the fixed sleeve slides synchronously when the telescopic rod slides.

[0011] A further feature of this invention is that the chair seat is provided with a positioning ball, the side wall of the fixing rod is provided with a through hole corresponding to the position of the positioning ball for the positioning ball to extend into, and the telescopic rod is provided with a plurality of positioning holes along the sliding direction of the device, and the positioning ball cooperates with the positioning holes.

[0012] The above-mentioned further settings enhance the operating feel, allowing users to perceive the movement, and also prevent the telescopic rod from shifting to one side, thus avoiding unnecessary friction.

[0013] A further improvement of this utility model: the chair seat includes a seat plate and a fixing box. The lower end face of the seat plate is provided with a receiving cavity. The fixing box is detachably disposed in the receiving cavity. The left and right sides of the fixing box are spaced apart from the side wall of the receiving cavity to form mounting grooves. The fixing rod is provided in both mounting grooves. The positioning ball is disposed on the fixing box.

[0014] With the above-mentioned further design, the structure is simple, easy to install, more robust, and has good stability during sliding.

[0015] A further feature of this invention is that the rear end of the fixing rod is provided with a positioning sleeve, which is located between the fixing rod and the telescopic rod. The positioning sleeve is provided with a fixing post, and the fixing rod is provided with a fixing hole, in which the fixing post is inserted.

[0016] With the above-mentioned further design, the positioning sleeve can play a guiding role, making the structure stable when the telescopic rod slides, and can also protect the telescopic rod and the fixed rod, preventing wear and paint damage. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of the seat according to a specific embodiment of the present utility model; Figure 2 This is a cross-sectional view of the telescopic rod when it is extended according to a specific embodiment of this utility model; Figure 3 This is a cross-sectional view of the telescopic rod retracted in a specific embodiment of this utility model; Figure 4 This is a schematic diagram of the bottom of the chair seat according to a specific embodiment of the present utility model; Figure 5 This is a schematic diagram of the installation of the base plate and the fixing box in a specific embodiment of this utility model; Figure 6 This is a schematic diagram of the protective components according to a specific embodiment of the present utility model; Figure 7 This is a schematic diagram of the fixed rod and the telescopic rod in a specific embodiment of this utility model; Figure 8 This is a schematic diagram of a telescopic rod according to a specific embodiment of the present utility model; Figure 9 This is a schematic diagram of the fixing rod in a specific embodiment of the present utility model; Figure 10 This is a schematic diagram of another type of seat according to a specific embodiment of the present utility model.

[0018] In the diagram, 1. Seat; 11. Positioning pin; 12. Seat plate; 121. Receiving cavity; 13. Fixing box; 14. Mounting slot; 2. Backrest; 3. Fixing rod; 31. Opening; 32. Through hole; 33. Fixing hole; 4. Telescopic rod; 41. Guide groove; 42. Positioning hole; 5. Locking component; 51. Locking rod; 52. Locking nut; 53. Rotating component; 6. Anti-slip component; 61. Return spring; 62. Fixing sleeve; 621. Connecting piece; 63. Sliding sleeve; 7. Positioning sleeve; 71. Fixing post. Detailed Implementation

[0019] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] It should be noted that all directional indicators (such as up, down, forward, backward, etc.) in the description of this utility model are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0021] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is 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. In the description of this utility model, "a number" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0022] Furthermore, the technical solutions of the various embodiments of this utility model 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 cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0023] like Figure 1-10 As shown, a retractable chair back structure includes a seat 1 and a backrest 2, and further includes a fixed rod 3, a telescopic rod 4, and a locking member 5 for locking the telescopic rod 4 to the fixed rod 3. The fixed rod 3 is installed on the seat 1 and is arranged along the seat depth direction of the seat 1. The rear end of the telescopic rod 4 is connected to the backrest 2 and slides synchronously with the backrest 2. The front end of the telescopic rod 4 is located inside the fixed rod 3 and slides in cooperation with the fixed rod 3. The telescopic rod 4 has a guide groove 41 along the seat depth direction of the seat 1. The front end of the fixed rod 3 has an opening 31 communicating with the guide groove 41. The locking member 5 extends through the opening 31 and the guide groove 41 into the telescopic rod 4. The rotation of the locking member 5 can lock or unlock the telescopic rod 4 to realize the telescopic movement of the backrest 2. Specifically, the locking member 5 includes a locking rod 51 and a locking nut 52. Nut 52 is located outside the fixed rod 3. One end of the locking rod 51 extends through the locking nut 52 into the telescopic rod 4, and the other end is provided with a rotating part 53. The rotating part 53 can be fixedly connected to the locking rod 51. The locking rod 51 and the locking nut 52 are threaded together. The rotating part 53 presses against the bottom of the locking nut 52. The chair back 2 is connected to the telescopic rod 4 and slides synchronously with the telescopic rod 4. The telescopic rod 4 slides relative to the fixed rod 3, thereby driving the chair back 2 to slide relative to the chair seat 1 to adjust the seat depth according to the user's needs. The cooperation between the guide groove 41 and the locking part 5 does not hinder the sliding of the telescopic rod 4, and can lock the telescopic rod 4 after it slides. By rotating the rotating part 53, the locking rod 51 is driven to rotate. The locking rod 51 rotates circumferentially relative to the locking nut 52 and slides axially to lock or unlock the telescopic rod 4. The operation is convenient and quick, and rapid adjustment can be achieved.

[0024] The telescopic rod 4 is equipped with a protective component, which includes a return spring 61 and a fixed sleeve 62 and a sliding sleeve 63 located at both ends of the return spring 61. The fixed sleeve 62 is located at the rear end of the telescopic rod 4 and is fixed to the telescopic rod 4. When the guide groove 41 exposes the fixed rod 3, the sliding sleeve 63 can slide within the telescopic rod 4 under the action of the return spring 61 and is located within the guide groove 41. The fixed sleeve 62 slides synchronously with the telescopic rod 4. When the telescopic rod 4 slides forward and the locking member 5 contacts the rear side wall of the guide groove 41, the return spring 61 is compressed by the fixed sleeve 62 and the sliding sleeve 63. Between the sliding sleeves 63, when the telescopic rod 4 slides backward, the sliding sleeve 63 will slide inside the telescopic rod 4 under the action of the return spring 61, blocking the guide groove 41 exposed outside the fixed rod 3, preventing children's fingers from sticking in, and improving safety; the rear end of the fixed sleeve 62 is provided with a connecting piece 621, which extends to the outside of the telescopic rod 4 and is located at the rear end of the telescopic rod 4 and slides synchronously with the telescopic rod 4. The chair back 2 is connected to the telescopic rod 4 through a connecting rod, and the connecting piece 621 is located between the telescopic rod 4 and the connecting rod, and drives the fixed sleeve 62 to slide synchronously when the telescopic rod 4 slides.

[0025] The seat 1 is provided with a positioning ball 11. The side wall of the fixing rod 3 is provided with a through hole 32 corresponding to the position of the positioning ball 11 for the positioning ball 11 to extend into. The telescopic rod 4 is provided with a plurality of positioning holes 42 along the sliding direction of the device. The positioning ball 11 cooperates with the positioning hole 42 to enhance the operating feel and allow the user to perceive it. It can also prevent the telescopic rod 4 from deviating when moving and generating unnecessary friction.

[0026] The chair seat 1 includes a seat plate 12 and a fixing box 13. The lower end face of the seat plate 12 is provided with a receiving cavity 121. The fixing box 13 is detachably disposed in the receiving cavity 121. The left and right sides of the fixing box 13 are spaced apart from the side wall of the receiving cavity 121 to form mounting grooves 14. The fixing rods 3 are provided in both mounting grooves 14. The positioning ball 11 is disposed on the fixing box 13. The structure is simple, easy to install, more robust, and has good stability when sliding.

[0027] The rear end of the fixed rod 3 is provided with a positioning sleeve 7, which is located between the fixed rod 3 and the telescopic rod 4. The positioning sleeve 7 is provided with a fixing post 71, and the fixed rod 3 is provided with a fixing hole 33. The fixing post 71 is inserted into the fixing hole 33. The positioning sleeve 7 can play a guiding role, so that the structure is stable when the telescopic rod 4 slides. It can also protect the telescopic rod 4 and the fixed rod 3 to avoid wear and paint damage.

Claims

1. A retractable chair back structure, comprising a seat (1) and a backrest (2), characterized in that, It also includes a fixed rod (3), a telescopic rod (4), and a locking member (5) for locking the telescopic rod (4) and the fixed rod (3). The fixed rod (3) is installed on the seat (1) and along the seat depth direction of the seat (1). The rear end of the telescopic rod (4) is connected to the backrest (2) and slides synchronously with the backrest (2). The front end of the telescopic rod (4) is located inside the fixed rod (3) and slides with the fixed rod (3). The telescopic rod (4) is provided with a guide groove (41) along the seat depth direction of the seat (1). The front end of the fixed rod (3) is provided with an opening (31) communicating with the guide groove (41). The locking member (5) extends through the opening (31) and the guide groove (41) into the telescopic rod (4). The rotation of the locking member (5) can lock or unlock the telescopic rod (4) to realize the telescopic movement of the backrest (2).

2. The extendable chair back structure according to claim 1, characterized in that, The locking component (5) includes a locking rod (51) and a locking nut (52). The locking nut (52) is located outside the fixed rod (3). One end of the locking rod (51) passes through the locking nut (52) and extends into the telescopic rod (4). The other end is provided with a rotating component (53), which presses against the bottom of the locking nut (52).

3. The retractable chair back structure according to claim 1 or 2, characterized in that, The telescopic rod (4) is provided with a protective component, which includes a return spring (61) and a fixed sleeve (62) and a sliding sleeve (63) located at both ends of the return spring (61). The fixed sleeve (62) is located at the rear end of the telescopic rod (4) and is fixed to the telescopic rod (4). When the fixed rod (3) is exposed in the guide groove (41), the sliding sleeve (63) can slide in the telescopic rod (4) under the action of the return spring (61) and is located in the guide groove (41).

4. The retractable chair back structure according to claim 1 or 2, characterized in that, The seat (1) is provided with a positioning ball (11), and the side wall of the fixing rod (3) is provided with a through hole (32) for the positioning ball (11) to be inserted. The telescopic rod (4) is provided with a number of positioning holes (42) along the sliding direction of the device. The positioning ball (11) cooperates with the positioning hole (42).

5. The retractable chair back structure according to claim 3, characterized in that, The rear end of the fixed sleeve (62) is provided with a connecting piece (621), which extends to the outside of the telescopic rod (4) and is located at the rear end of the telescopic rod (4) and slides synchronously with the telescopic rod (4).

6. The extendable chair back structure according to claim 4, characterized in that, The chair seat (1) includes a seat plate (12) and a fixing box (13). The lower end face of the seat plate (12) is provided with a receiving cavity (121). The fixing box (13) is detachably disposed in the receiving cavity (121). The left and right sides of the fixing box (13) are spaced apart from the side wall of the receiving cavity (121) to form mounting grooves (14). The fixing rod (3) is provided in both mounting grooves (14). The positioning ball (11) is disposed on the fixing box (13).

7. The retractable chair back structure according to claim 1 or 2, characterized in that, The rear end of the fixed rod (3) is provided with a positioning sleeve (7), which is located between the fixed rod (3) and the telescopic rod (4). The positioning sleeve (7) is provided with a fixing post (71), and the fixed rod (3) is provided with a fixing hole (33). The fixing post (71) is inserted into the fixing hole (33).

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