Synchronous adjusting structure of chair backrest

Abstract

The utility model discloses a synchronous adjusting structure of a chair backrest, which relates to the field of chair backrests and comprises a backrest body, a cushion body and a rotating main shaft, a rotating push block is arranged in the middle of the rotating main shaft, push lugs are arranged on two sides of the rotating push block, push rods are sleeved outside two ends of the rotating main shaft, and the push rods are sleeved outside the cushion body. The two ends of the rotating main shaft are rotationally matched with the interiors of the two push rods correspondingly, the rotating push block can push the two push rods to move correspondingly, two backrest limiting plates are arranged on the two sides of the cushion body and located on the two sides of the two push rods correspondingly, and the two backrest limiting plates are located on the two sides of the two push rods correspondingly. Two cushion fixing seats are arranged on the two sides of the backrest body, and the technical problems that the two adjusting devices need to synchronously unlock the two connecting arms, but the operation difficulty is large, if the unlocking speeds of the two adjusting devices are deviated, the backrest rotates in an inclined state, and the backrest is inconvenient to adjust are solved.

Description

Technical Field

[0001] The utility model relates to the field of chair backrests, in particular to a synchronous adjustment structure of a chair backrest. Background Art

[0002] When students take a lunch break in the classroom, it is common for them to sit on a chair and then lie on the desk to rest. However, during the adolescent development stage, this way of resting keeps the student's spine in a bent and compressed state. In the long run, it is easy to cause damage to the student's spine and needs to be corrected. In order to solve the above technical problems, in the prior art, a chair provides a structure with an adjustable backrest, which includes a seat, a backrest and an adjustment device. The backrest is provided with two connecting arms, and the seat is rotatably connected to the two connecting arms. There are two adjustment devices, which are responsible for controlling the locking or unlocking of the two connecting arms, so as to adjust the backrest to a sitting position or a lying position.

[0003] In order to ensure that the backrest can rotate smoothly, the two adjustment devices need to unlock the two connecting arms synchronously, but this operation is difficult. If there is a deviation in the unlocking speed of the two adjustment devices, the backrest will rotate in a tilted state, causing inconvenience in adjusting the backrest. Utility Model Content

[0004] In order to solve the above-mentioned technical problems, the utility model provides a chair backrest, aiming to solve the problem that two adjustment devices need to unlock two connecting arms synchronously, but this operation is difficult. If there is a deviation in the unlocking speed of the two adjustment devices, the backrest will rotate in a tilted state, causing inconvenience in adjusting the backrest.

[0005] A synchronous adjustment structure of a chair backrest, comprising a backrest body, a seat cushion body and a rotating main shaft, a rotating push block is provided in the middle of the rotating main shaft, push protrusions are provided on both sides of the rotating push block, push rods are provided on the outer sleeves of both ends of the rotating main shaft, the two ends of the rotating main shaft are respectively matched with the internal rotation of the two push rods, the rotating push block can respectively push the two push rods to move, two backrest limit plates are provided on both sides of the backrest body, the two backrest limit plates are respectively located on both sides of the two push rods, two seat cushion fixing seats are provided on both sides of the seat cushion body, and the two seat cushion fixing seats are located On both sides of the two backrest limit plates, one side of the seat cushion fixing seat is elastically connected to the limit movable block, the rotating main shaft is internally rotatably connected with the two backrest limit plates, the two limit movable blocks and the two seat cushion fixing seats, one side of the limit movable block is provided with a limit plug and a first guide slide column, the interior of the backrest limit plate is provided with a limit groove and a guide groove, the limit plug is plugged into the adjacent limit groove, the first guide slide column passes through the adjacent guide groove, one end of the first guide slide column is provided with a second guide slide column, and the second guide slide column is connected to one end of the adjacent push rod.

[0006] A further solution of the utility model: a passive push head is provided at the other end of the two push rods, and the two passive push heads are respectively facing the rotating push blocks. A locking groove is opened on one side of the passive push head, and the locking groove abuts against the adjacent push protrusion, and the push protrusion can be separated from the locking groove.

[0007] A further solution of the utility model is as follows: a first guiding bevel is formed on one side of the locking groove, a second guiding bevel is formed on one side of the passive push head, and the second guiding bevel of the passive push head conflicts with the adjacent first guiding bevel.

[0008] A further solution of the utility model is as follows: a return spring is provided on one side of the cushion fixing seat, and one end of the return spring is connected to the adjacent limiting movable block.

[0009] A further solution of the utility model: a cushion connecting arm is provided at one end of the cushion fixing seat, and the cushion connecting arm is connected to the cushion body through screws; a backrest connecting arm is provided at one end of the backrest limiting plate, and the backrest connecting arm is connected to the backrest body through screws.

[0010] A further solution of the utility model: a connecting seat is provided on one side of the backrest limiting plate, a movable cavity is opened inside the connecting seat, the movable cavity is slidably and rotatably connected to one end of the adjacent pushing rod, a transmission groove is opened on one side of the seat cushion fixing seat, and the limiting movable block is plugged into the transmission groove.

[0011] A further solution of the utility model is that a protection tube is provided on the outside of the rotating push block, the pushing protrusion and the pushing rod are located inside the protection tube, and the pushing protrusion, the protection tube and the rotating push block are coaxially driven.

[0012] A further solution of the utility model is that knobs are provided at both ends of the rotating main shaft, and the two knobs are located on both sides of the two cushion fixing seats.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] When the backrest body needs to be adjusted to a lying position, the rotating main shaft is rotated, and the rotating main shaft drives the rotating push block to rotate. The rotating push block pushes the two push rods away from each other during the rotation process. Since the second guide slide is connected to the other end of the adjacent push rod, the push rod drives the second guide slide to push during the movement. The second guide slide pushes the first guide slide out of the guide groove, so that the second guide slide and the guide groove slide together. The first guide slide will drive the limit movable block to move during the process of pushing out the guide groove, and the limit movable block drives the limit plug-in to disengage from the limit slot, so that the two backrest limit plates can rotate at the same time, thereby avoiding the backrest body from tilting during the rotation process due to asynchronous unlocking.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Figure 2 It is a schematic diagram of a backrest body of the utility model in a lying position.

[0018] Figure 3 It is a structural schematic diagram of the protection tube of the utility model.

[0019] Figure 4 It is a structural schematic diagram of the passive push head of the utility model.

[0020] Figure 5 It is a structural schematic diagram of the rotary push block of the utility model.

[0021] Figure 6 It is a structural schematic diagram of the push rod of the utility model.

[0022] In the figure: 1, backrest body, 2, cushion body, 3, rotating main shaft, 4, rotating push block, 5, pushing convex block, 6, second guide inclined surface, 7, backrest connecting arm, 8, backrest limiting plate, 9, cushion fixing seat, 10, cushion connecting arm, 11, transmission groove, 12, limiting movable block, 13, return spring, 14, limiting groove, 15, guide groove, 16, limiting plug convex, 17, first guide slide column, 18, second guide slide column, 19, push rod, 20, connecting seat, 21, movable cavity, 22, passive push head, 23, knob, 24, locking groove, 25, first guide inclined surface, 26, protective tube. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] See also Figures 1 to 6 In the embodiment of the utility model, a synchronous adjustment structure of a chair backrest comprises a backrest body 1, a cushion body 2 and a rotating main shaft 3, a rotating push block 4 is provided in the middle of the rotating main shaft 3, and push protrusions 5 are provided on both sides of the rotating push block 4, and push rods 19 are provided on both ends of the rotating main shaft 3. The two ends of the rotating main shaft 3 are respectively matched with the internal rotation of the two push rods 19, and the rotating push block 4 can respectively push the two push rods 19 to move, and two backrest limiting plates 8 are provided on both sides of the backrest body 1, and the two backrest limiting plates 8 are respectively located on both sides of the two push rods 19, and two cushion fixing seats 9 are provided on both sides of the cushion body 2. Located on both sides of the two backrest limit plates 8, one side of the seat cushion fixing seat 9 is elastically connected to the limit movable block 12, the rotating main shaft 3 is internally rotatably connected with the two backrest limit plates 8, the two limit movable blocks 12 and the two seat cushion fixing seats 9, one side of the limit movable block 12 is provided with a limit plug 16 and a first guide slide column 17, the interior of the backrest limit plate 8 is provided with a limit groove 14 and a guide groove 15, the limit plug 16 is plugged into the adjacent limit groove 14, the first guide slide column 17 passes through the adjacent guide groove 15, one end of the first guide slide column 17 is provided with a second guide slide column 18, and the second guide slide column 18 is connected to one end of the adjacent push rod 19.

[0025] When the backrest body 1 is in normal use, the limiting insertion protrusion 16 of the limiting movable block 12 is in an inserted state with the limiting groove 14 of the backrest limiting plate 8, so that the backrest limiting plate 8 is fixed and the backrest body 1 does not rotate; when the backrest body 1 needs to be adjusted to a lying state, the rotating main shaft 3 is rotated, and the rotating main shaft 3 drives the rotating push block 4 to rotate. The rotating push block 4 pushes the two push rods 19 away from each other during the rotation process. Since the second guide slide column 18 is connected to the other end of the adjacent push rod 19, the push rod 19 moves In the process of pushing out the first guide slide post 17 from the guide groove 15, the second guide slide post 18 drives the first guide slide post 17 to push, and the second guide slide post 18 makes the second guide slide post 18 and the guide groove 15 slide and cooperate. In the process of pushing out the first guide slide post 17 from the guide groove 15, the limiting movable block 12 drives the limiting plug 16 to disengage from the limiting groove 14, so that the two backrest limiting plates 8 can rotate at the same time, thereby avoiding the backrest body 1 from tilting during the rotation process due to asynchronous unlocking.

[0026] In addition, when the user lies down on the backrest body 1 , the second guide slide post 18 will slide to one side of the guide slot 15 . Under the weight of the user and the limitation of the guide slot 15 , the backrest body 1 can easily maintain a lying position.

[0027] When the backrest body 1 needs to be adjusted to a sitting position, the rotating main shaft 3 is rotated, and the rotating main shaft 3 drives the rotating push block 4 to rotate. Since the cushion fixing seat 9 is elastically connected to the limiting movable block 12, under the action of elastic force, the two push rods 19 approach each other during the rotation of the rotating push block 4, and the backrest body 1 is rotated, so that the limiting plug protrusion 16 is plugged into the limiting groove 14, thereby facilitating the backrest body 1 to be restored to a sitting position.

[0028] A passive push head 22 is provided at the other end of the two push rods 19 , and the two passive push heads 22 face the rotating push block 4 respectively. A locking groove 24 is provided on one side of the passive push head 22 , and the locking groove 24 abuts against the adjacent push protrusion 5 , and the push protrusion 5 can be separated from the locking groove 24 .

[0029] A first guiding inclined surface 25 is formed on one side of the locking groove 24 , and a second guiding inclined surface 6 is formed on one side of the passive push head 22 . The second guiding inclined surface 6 of the passive push head 22 abuts against the adjacent first guiding inclined surface 25 .

[0030] When the backrest body 1 needs to be adjusted to a lying position, the rotating main shaft 3 is rotated, and the rotating main shaft 3 drives the rotating push block 4 to rotate. Under the guidance of the first guide bevel 25 and the second guide bevel 6, the passive push head 22 disengages from the locking groove 24 during the rotation process, so that the two push rods 19 move away from each other, thereby facilitating the adjustment of the backrest body 1 to a lying position.

[0031] A return spring 13 is provided on one side of the cushion fixing seat 9 , and one end of the return spring 13 is connected to the adjacent limiting movable block 12 .

[0032] A cushion connecting arm 10 is provided at one end of the cushion fixing seat 9, and the cushion connecting arm 10 is connected to the cushion body 2 through screws. A backrest connecting arm 7 is provided at one end of the backrest limiting plate 8, and the backrest connecting arm 7 is connected to the backrest body 1 through screws.

[0033] A connecting seat 20 is provided on one side of the backrest limit plate 8, and a movable cavity 21 is opened inside the connecting seat 20. The movable cavity 21 is slidably connected to one end of the adjacent push rod 19. A transmission groove 11 is opened on one side of the seat cushion fixing seat 9, and the limiting movable block 12 is plugged into the transmission groove 11.

[0034] A protection tube 26 is provided outside the rotating push block 4 , and the push protrusion 5 and the push rod 19 are located inside the protection tube 26 . The push protrusion 5 , the protection tube 26 and the rotating push block 4 are coaxially driven.

[0035] Knobs 23 are provided at both ends of the rotating main shaft 3 , and the two knobs 23 are located on both sides of the two cushion fixing seats 9 .

[0036] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A synchronous adjustment structure for a chair backrest, It is characterized in that The invention comprises a backrest body, a seat cushion body and a rotating main shaft, wherein a rotating push block is provided in the middle of the rotating main shaft, push protrusions are provided on both sides of the rotating push block, push rods are provided on the outer sleeves of both ends of the rotating main shaft, and the two ends of the rotating main shaft are respectively matched with the internal rotation of the two push rods, and the rotating push block can respectively push the two push rods to move, two backrest limit plates are provided on both sides of the backrest body, and the two backrest limit plates are respectively located on both sides of the two push rods, and two seat cushion fixing seats are provided on both sides of the seat cushion body, and the two seat cushion fixing seats are located on the two backrest limit plates On both sides, one side of the seat cushion fixing seat is elastically connected to a limited movable block, the rotating main shaft is rotatably connected with the two backrest limiting plates, the two limiting movable blocks and the two seat cushion fixing seats, one side of the limiting movable block is provided with a limiting plug and a first guide slide column, the interior of the backrest limiting plate is provided with a limiting groove and a guide groove, the limiting plug is plugged into the adjacent limiting groove, the first guide slide column passes through the adjacent guide groove, one end of the first guide slide column is provided with a second guide slide column, and the second guide slide column is connected to one end of the adjacent pushing rod.

2. A synchronous adjustment structure for a chair backrest according to claim 1, It is characterized in that A passive push head is provided at the other end of the two push rods, and the two passive push heads face the rotating push blocks respectively. A locking groove is provided on one side of the passive push head, and the locking groove abuts against the adjacent push protrusion, and the push protrusion can be separated from the locking groove.

3. A synchronous adjustment structure for a chair backrest according to claim 2, It is characterized in that A first guiding inclined surface is formed on one side of the locking groove, and a second guiding inclined surface is formed on one side of the passive push head. The second guiding inclined surface of the passive push head conflicts with the adjacent first guiding inclined surface.

4. A synchronous adjustment structure for a chair backrest according to claim 3, It is characterized in that A return spring is arranged on one side of the cushion fixing seat, and one end of the return spring is connected to the adjacent limiting movable block.

5. A synchronous adjustment structure for a chair backrest according to claim 4, It is characterized in that A seat cushion connecting arm is provided at one end of the seat cushion fixing seat, and the seat cushion connecting arm is connected to the seat cushion body through screws. A backrest connecting arm is provided at one end of the backrest limiting plate, and the backrest connecting arm is connected to the backrest body through screws.

6. A synchronous adjustment structure for a chair backrest according to claim 5, It is characterized in that A connecting seat is provided on one side of the backrest limiting plate, a movable cavity is opened inside the connecting seat, the movable cavity is slidably and rotatably connected to one end of the adjacent pushing rod, a transmission groove is opened on one side of the seat cushion fixing seat, and the limiting movable block is plugged into the transmission groove.

7. A synchronous adjustment structure for a chair backrest according to claim 6, It is characterized in that A protection tube is arranged outside the rotating push block, the pushing protrusion and the pushing rod are located inside the protection tube, and the pushing protrusion, the protection tube and the rotating push block are coaxially driven.

8. The synchronous adjustment structure of a chair backrest according to claim 1, It is characterized in that Knobs are arranged at both ends of the rotating main shaft, and the two knobs are located on both sides of the two cushion fixing seats.

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