Backrest angle adjusting and positioning device

Abstract

The utility model discloses a backrest angle adjusting and positioning device which comprises a seat, the top end of the seat is provided with a backrest adjusting assembly, the backrest adjusting assembly comprises a backrest body arranged above the seat, the bottom end of the backrest body is provided with a rotating connecting piece, the top end of the seat is provided with a fixed connecting piece, and the rotating connecting piece is connected with the fixed connecting piece. The rotary connecting piece comprises a middle block fixedly installed at the bottom end of the backrest body, two side blocks are installed at the bottom end of the backrest body and symmetrically arranged on the two sides of the middle block, and a fixing shaft is fixedly installed between the middle block and the side blocks. During working, the fixed shaft is rotationally mounted in the rotating groove in the inner side of the fixed block, so that the backrest body can rotate, the positioning clamping grooves are uniformly formed in the side wall of the fixed block, and the positioning clamping plate can be pulled to stretch out and draw back through the pull rod, so that the positioning clamping plate can be clamped with the positioning clamping grooves; therefore, the backrest body can be conveniently positioned and fixed after being subjected to angle adjustment, and the backrest body can be conveniently positioned and fixed.

Description

Technical Field

[0001] The utility model belongs to the technical field of angle adjustment, and particularly relates to a backrest angle adjustment and positioning device. Background Art

[0002] According to the patent document with the authorization announcement number of "CN208640097U" and the invention name of "Backrest Rotating Mechanism", it is recorded in the specification: The second fixing member includes a fixing portion, a rotating shaft, and a flat plate-shaped mounting portion. During assembly, one end of the rotating shaft is first fixed to the mounting portion. The mounting portion is located on one side of the first fixing member, and the fixing portion is located on the other side of the first fixing member and between the upper mounting portion and the lower mounting portion. The rotating shaft passes through the through hole and the other end of the rotating shaft is fixed to the fixing portion. Then, the sliding member passes through the arc-shaped groove from this side of the mounting portion and the sliding member is fixed to the fixing portion. The sliding member is a pin, and a limiting portion is formed at the end of the pin. The limiting portion and the fixing portion jointly limit the sliding member in the arc-shaped groove. Taking the direction in the figure as an example, when one sliding member is located at the upper end of the corresponding arc-shaped groove, the other sliding member is located at the lower end of the corresponding arc-shaped groove. However, there are still the following defects:

[0003] The backrest is fixed by clamping with a pin. When the backrest is in use, pressure acts on the pin, and there is no auxiliary support fixing member, which easily causes the pin to be deformed under pressure and affects the rotation of the backrest. Content of the Utility Model

[0004] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a backrest angle adjustment and positioning device, which effectively solves the problem that the backrest is fixed by clamping with a pin and the pressure acts on the pin, which easily causes the pin to be deformed under pressure.

[0005] To achieve the above object, the utility model provides the following technical solution: A backrest angle adjustment and positioning device includes a seat, and a backrest adjustment assembly is provided at the top of the seat;

[0006] The backrest adjustment assembly includes a backrest body arranged above the seat. A rotating connecting member is installed at the bottom end of the backrest body, and a fixed connecting member is installed at the top end of the seat;

[0007] The rotating connecting member includes a middle block fixedly installed at the bottom end of the backrest body. Two side blocks are installed at the bottom end of the backrest body. The two side blocks are symmetrically arranged on both sides of the middle block. A fixed shaft is fixedly installed between the middle block and the side blocks. A clamping and positioning member is installed inside the middle block, and a negative pressure fixing member is installed inside the side block;

[0008] The fixed connecting member includes two fixed blocks fixedly installed at the top end of the seat. The fixed blocks are located between the middle block and the side blocks. A rotating groove is formed on the fixed block. The fixed shaft is located inside the rotating groove. A positioning card slot is evenly formed on one side of the fixed block close to the middle block.

[0009] Preferably, the clamping and positioning member includes a movable groove formed inside the middle block. Plate grooves are symmetrically formed at both ends of the movable groove and penetrate to the outside of the middle block. The plate grooves correspond to the positioning card slots.

[0010] Preferably, a movable plate is movably installed inside the movable groove, and a positioning card plate is movably installed inside the plate groove. The positioning card plate is inserted into one of the positioning card slots. A connecting rod is provided between the movable plate and the positioning card plate, and both ends of the connecting rod are hinged to the movable plate and the positioning card plate respectively.

[0011] Preferably, guide rods are symmetrically installed inside the movable groove. The movable plate is slidably connected to the guide rods. Springs are symmetrically installed on one side of the movable plate close to the front of the backrest adjustment assembly. One end of each spring is fixedly connected to the inner wall of the movable groove. A pull rod is installed on the back of the movable plate, and one end of the pull rod penetrates to the back of the middle block.

[0012] Preferably, the negative pressure fixing member includes suction cups installed at equal angles on the side of the side block close to the fixed block. The end of each suction cup contacts the surface of the fixed block. A negative pressure cavity is formed inside the side block, and the negative pressure cavity is communicated with the suction cups.

[0013] Preferably, a screw cylinder is installed on the side of the side block away from the fixed block. A piston is movably installed inside the negative pressure cavity. The outer wall of the piston is in close contact with the inner wall of the negative pressure cavity. A screw rod is installed on the side of the piston away from the fixed block, and the screw rod is threadedly connected to the screw cylinder.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] During operation, the fixed shaft is rotatably installed in the rotating groove inside the fixed block, so that the backrest body can rotate. The positioning card slots are evenly formed on the side wall of the fixed block. The positioning card plate can be pulled to expand and contract through the pull rod, so that the positioning card plate can be clamped with the positioning card slot, thereby facilitating the positioning and fixing after the angle adjustment of the backrest body and facilitating the positioning and fixing of the backrest body.

[0016] During operation, suction cups are installed at equal angles on one side of the side block, and the end of each suction cup contacts the surface of the fixed block. By screwing the screw rod to pull the piston to move away from the fixed block, negative pressure suction is generated between the suction cup and the fixed block, thereby further fixing the backrest body, improving the supporting force of the backrest adjustment assembly, and playing an auxiliary supporting and fixing role, thereby improving the supporting effect of the backrest. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. They are used together with the embodiments of the present utility model to explain the present utility model, and do not constitute a limitation to the present utility model.

[0018] In the accompanying drawings:

[0019] Figure 1 is a schematic structural view of an angle adjustment and positioning device for the backrest of the present utility model;

[0020] Figure 2 is a schematic structural view of the backrest adjustment assembly of the present utility model;

[0021] Figure 3 is a schematic structural view of the fixed connecting piece of the present utility model;

[0022] Figure 4 is a schematic structural view of the rotating connecting piece of the present utility model;

[0023] Figure 5 is a schematic structural view of the clamping and positioning piece of the present utility model;

[0024] Figure 6 is a schematic structural view of the negative pressure fixing piece of the present utility model.

[0025] In the figure: 1, seat; 2, backrest adjustment assembly; 201, backrest body; 202, rotating connecting piece; 2021, middle block; 2022, side block; 2023, fixed shaft; 203, fixed connecting piece; 2031, fixed block; 2032, rotating groove; 2033, positioning card slot; 204, clamping and positioning piece; 2041, movable groove; 2042, plate groove; 2043, movable plate; 2044, positioning card plate; 2045, connecting rod; 2046, guide rod; 2047, spring; 2048, pull rod; 205, negative pressure fixing piece; 2051, suction cup; 2052, negative pressure cavity; 2053, screw cylinder; 2054, piston; 2055, screw rod. Specific embodiments

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments; based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0027] Embodiment 1, given by Figure 1-6 The present utility model relates to an angle adjustment and positioning device for a backrest, including a seat 1, and a backrest adjustment assembly 2 is provided at the top of the seat 1;

[0028] The backrest adjustment assembly 2 includes a backrest body 201 provided above the seat 1, a rotating connecting piece 202 is installed at the bottom end of the backrest body 201, and a fixed connecting piece 203 is installed at the top end of the seat 1;

[0029] The rotating connecting member 202 includes a middle block 2021 fixedly installed at the middle of the bottom end of the backrest body 201. Two side blocks 2022 are installed at the bottom end of the backrest body 201. The two side blocks 2022 are symmetrically arranged on both sides of the middle block 2021. A fixed shaft 2023 is fixedly installed between the middle block 2021 and the side block 2022. A clamping and positioning member 204 is installed inside the middle block 2021, and a negative pressure fixing member 205 is installed inside the side block 2022;

[0030] The fixed connecting member 203 includes two fixed blocks 2031 fixedly installed at the top end of the seat 1. The fixed blocks 2031 are located between the middle block 2021 and the side block 2022. A rotating groove 2032 is formed in the fixed block 2031. The fixed shaft 2023 is located inside the rotating groove 2032. A positioning card slot 2033 is evenly formed on one side of the fixed block 2031 close to the middle block 2021.

[0031] The clamping and positioning member 204 includes a movable groove 2041 formed inside the middle block 2021. Plate grooves 2042 are symmetrically formed at both ends of the movable groove 2041. The plate grooves 2042 penetrate to the outside of the middle block 2021. The plate grooves 2042 correspond to the positioning card slots 2033. A movable plate 2043 is movably installed inside the movable groove 2041. A positioning card plate 2044 is movably installed inside the plate groove 2042. The positioning card plate 2044 is inserted into one of the positioning card slots 2033. A connecting rod 2045 is provided between the movable plate 2043 and the positioning card plate 2044. The two ends of the connecting rod 2045 are respectively hinged to the movable plate 2043 and the positioning card plate 2044. Guide rods 2046 are symmetrically installed inside the movable groove 2041. The movable plate 2043 is slidably connected to the guide rods 2046. Springs 2047 are symmetrically installed on one side of the movable plate 2043 close to the front of the backrest adjustment assembly 2. One end of the spring 2047 is fixedly connected to the inner wall of the movable groove 2041. A pull rod 2048 is installed on the back of the movable plate 2043. One end of the pull rod 2048 penetrates to the back of the middle block 2021. The fixed shaft 2023 is rotatably installed in the rotating groove 2032 inside the fixed block 2031, so that the backrest body 201 can rotate. The positioning card slots 2033 are evenly formed on the side wall of the fixed block 2031. The positioning card plate 2044 can be pulled to expand and contract through the pull rod 2048, so that the positioning card plate 2044 can be engaged with the positioning card slot 2033, thereby facilitating the positioning and fixing after the angle adjustment of the backrest body 201 and facilitating the positioning and fixing of the backrest body 201.

[0032] The negative pressure fixing member 205 includes suction cups 2051 that are equally angularly installed on one side of the side block 2022 close to the fixing block 2031. The end of the suction cup 2051 contacts the surface of the fixing block 2031. A negative pressure chamber 2052 is formed inside the side block 2022. The negative pressure chamber 2052 is communicated with the suction cup 2051. A screw cylinder 2053 is installed on one side of the side block 2022 away from the fixing block 2031. A piston 2054 is movably installed inside the negative pressure chamber 2052. The outer wall of the piston 2054 is closely attached to the inner wall of the negative pressure chamber 2052. A screw rod 2055 is installed on the side of the piston 2054 away from the fixing block 2031. The screw rod 2055 is threadedly connected to the screw cylinder 2053. Suction cups 2051 are equally angularly installed on one side of the side block 2022. The end of the suction cup 2051 contacts the surface of the fixing block 2031. Turning the screw rod 2055 pulls the piston 2054 to move away from the fixing block 2031, generating a negative pressure suction force between the suction cup 2051 and the fixing block 2031, thereby further fixing the backrest body 201 and improving the supporting force of the backrest adjustment assembly 2.

[0033] Working principle: When the backrest body 201 needs to be rotated for position adjustment, turn the screw rod 2055 to rotate, move the piston 2054 back to its original position towards the fixing block 2031. Then pull the pull rod 2048 outwards, causing the movable plate 2043 to move. Pull the two positioning cards 2044 closer to each other through the connecting rod 2045, so that the positioning card 2044 is disengaged from the positioning slot 2033. Then rotate the backrest body 201, so that the fixed shaft 2023 rotates inside the rotating slot 2032, thereby adjusting the angle of the backrest body 201. After adjusting to the corresponding angle, release the pull rod 2048. The movable plate 2043 moves back under the elastic force of the guide rod 2046, and pushes the positioning card 2044 to move outwards through the connecting rod 2045, so that the positioning card 2044 is snapped into the positioning slot 2033 to position and fix the backrest body 201;

[0034] After being fixed, since the end of the suction cup 2051 contacts the surface of the fixing block 2031, turning the screw rod 2055 pulls the piston 2054 to move away from the fixing block 2031, generating a negative pressure suction force between the suction cup 2051 and the fixing block 2031, thereby further fixing the backrest body 201 and improving the supporting force of the backrest adjustment assembly 2.

Claims

1. A backrest angle adjustment and positioning device, comprising a seat (1), characterized in that: A backrest adjustment component (2) is provided at the top end of the seat (1); The backrest adjustment assembly (2) comprises a backrest body (201) arranged above the seat (1), a rotating connection member (202) is installed at the bottom end of the backrest body (201), and a fixed connection member (203) is installed at the top end of the seat (1); The rotating connecting member (202) comprises a middle block (2021) fixedly mounted on the bottom end of the backrest body (201); two side blocks (2022) are mounted on the bottom end of the backrest body (201); the two side blocks (2022) are symmetrically arranged on both sides of the middle block (2021); a fixed shaft (2023) is fixedly mounted between the middle block (2021) and the side blocks (2022); a clamping positioning member (204) is mounted inside the middle block (2021); and a negative pressure fixing member (205) is mounted inside the side blocks (2022); The fixed connection member (203) comprises two fixed blocks (2031) fixedly mounted on the top of the seat (1); the fixed blocks (2031) are located between the middle block (2021) and the side blocks (2022); a rotation groove (2032) is provided on the fixed blocks (2031); the fixed shaft (2023) is located inside the rotation groove (2032); and positioning grooves (2033) are evenly provided on one side of the fixed blocks (2031) close to the middle block (2021).

2. A backrest angle adjustment and positioning device according to claim 1, characterized in that: The clamping positioning member (204) comprises a movable groove (2041) opened inside the middle block (2021), and plate grooves (2042) are symmetrically opened at both ends of the movable groove (2041). The plate grooves (2042) penetrate to the outside of the middle block (2021), and the plate grooves (2042) correspond to the positioning clamping grooves (2033).

3. A backrest angle adjustment and positioning device according to claim 2, characterized in that: A movable plate (2043) is movably installed inside the movable groove (2041), and a positioning card plate (2044) is movably installed inside the plate groove (2042). The positioning card plate (2044) is inserted into one of the positioning card grooves (2033). A connecting rod (2045) is provided between the movable plate (2043) and the positioning card plate (2044), and the two ends of the connecting rod (2045) are respectively hinged to the movable plate (2043) and the positioning card plate (2044).

4. A backrest angle adjustment and positioning device according to claim 3, characterized in that: A guide rod (2046) is symmetrically installed inside the movable groove (2041), and the movable plate (2043) is slidably connected to the guide rod (2046). A spring (2047) is symmetrically installed on one side of the movable plate (2043) close to the front of the backrest adjustment component (2), and one end of the spring (2047) is fixedly connected to the inner wall of the movable groove (2041). A pull rod (2048) is installed on the back of the movable plate (2043), and one end of the pull rod (2048) passes through the back of the middle block (2021).

5. The backrest angle adjustment and positioning device according to claim 1, characterized in that: The negative pressure fixing member (205) comprises a suction cup (2051) installed at an equal angle on a side of the side block (2022) close to the fixing block (2031), the end of the suction cup (2051) contacts the surface of the fixing block (2031), a negative pressure cavity (2052) is provided inside the side block (2022), and the negative pressure cavity (2052) is connected to the suction cup (2051).

6. A backrest angle adjustment and positioning device according to claim 5, characterized in that: A screw barrel (2053) is installed on the side of the side block (2022) away from the fixed block (2031), a piston (2054) is movably installed inside the negative pressure chamber (2052), the outer wall of the piston (2054) is in close contact with the inner wall of the negative pressure chamber (2052), and a screw rod (2055) is installed on the side of the piston (2054) away from the fixed block (2031), and the screw rod (2055) is threadedly connected to the screw barrel (2053).

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