Convenient and adjustable seat backrest structure

Abstract

The utility model discloses a convenient and adjustable seat backrest structure. The convenient and adjustable seat backrest structure comprises a bracket, an adjusting assembly and a backrest plate, an adjusting groove extending up and down is formed in the middle of the support. The front side of the adjusting assembly is connected with the backrest plate; an adjusting part is arranged on the rear side of the adjusting assembly; the left end and the right end of the adjusting part are matched with the left side edge and the right side edge of the adjusting groove in a front-back limiting mode respectively, and the adjusting part can slide up and down in a reciprocating mode or be positioned and fixed in the adjusting groove. The backrest plate is simple and convenient to operate, the height of the backrest plate can be conveniently adjusted only by controlling the matching relation between the adjusting assembly and the adjusting groove and fixing the adjusting assembly at any height position in the adjusting groove, and the adjusting use experience of a user on the backrest plate can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of seat backs, in particular to a seat back structure that is convenient to adjust. Background Art

[0002] Seats are a type of furniture with very wide applications in daily life and work. To meet people's personalized needs and bring a more comfortable and healthy usage experience, the structure and functions of seats are constantly being improved.

[0003] Existing seat back structures have an adjustable function to adapt to different heights for use. For example, a smart learning seat that can automatically adapt to a child's height disclosed in Chinese Patent Publication No. CN115581367A has an adjustable backrest. However, for the backrest in this solution, it is necessary to align with the positioning groove for fixing during adjustment, which has the problems of troublesome adjustment operation and being more laborious. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a seat back structure that is convenient to adjust, which has the advantage of convenient use.

[0005] To achieve the above purpose, the solution of the utility model is:

[0006] A seat back structure that is convenient to adjust, including a bracket, an adjustment component, and a backrest plate;

[0007] An adjustment groove extending vertically is provided in the middle of the bracket;

[0008] The front side of the adjustment component is connected to the backrest plate;

[0009] An adjustment part is provided on the rear side of the adjustment component;

[0010] The left and right ends of the adjustment part are respectively in front-back limit fit with the left and right side edges of the adjustment groove, and the adjustment part can reciprocally slide up and down or be positioned and fixed in the adjustment groove.

[0011] Further, a knob is provided on the back surface of the adjustment part, and two pressing blocks are respectively provided on the left and right sides of the knob; the rotation of the knob drives the two pressing blocks to slide at the left and right ends of the adjustment part to actively press the two side edges of the adjustment groove.

[0012] Further, clamping grooves penetrating up and down are respectively provided at the left and right ends of the adjustment part; the two side edges of the adjustment groove respectively extend into the clamping grooves on the same side for front-back limit, and can move up and down relative to the clamping grooves.

[0013] Further, the adjustment part includes an adjustment main body and an adjustment rear shell; the adjustment rear shell covers the rear side of the adjustment main body, and the clamping grooves are respectively formed between the left and right sides of the adjustment rear shell and the rear side of the adjustment main body.

[0014] Further, the two pressing blocks are respectively slidably assembled on the left and right sides of the adjusting part; the outer ends of the pressing blocks have pressing parts, the pressing parts are movably abutted against the side edges of the adjusting grooves, and the inner ends of the pressing blocks have arc convex surfaces;

[0015] The knob is rotatably installed on the adjusting part, and the knob body of the knob is located between the inner ends of the two pressing blocks; two linkage parts are provided on the outer periphery of the knob body at an interval of 180 degrees, and each linkage part includes a convex part and a concave part distributed adjacent to each other in the circumferential direction;

[0016] A tension spring is connected between the two pressing blocks, and the tension spring provides an elastic force to make the inner ends of the pressing blocks abut against the linkage parts;

[0017] When the convex parts of the two linkage parts of the knob simultaneously abut against the arc convex surfaces of the two pressing blocks, the pressing parts of the pressing blocks press the side edges of the adjusting grooves; when the concave parts of the two linkage parts of the knob simultaneously abut against the circular ring convex surfaces of the two pressing blocks, the pressing parts of the pressing blocks release the pressing on the side edges of the adjusting grooves.

[0018] Further, the adjusting part includes an adjusting main body and an adjusting rear shell; the adjusting rear shell covers the rear side of the adjusting main body, and an installation chamber is provided between the adjusting rear shell and the adjusting main body;

[0019] The knob body of the knob is rotatably installed in the middle of the installation chamber, and the rear side of the knob body has a rotating handle exposed on the rear side of the adjusting rear shell; the two pressing blocks are respectively installed in the sliding grooves on the left and right sides in the installation chamber; the tension spring is located on the front side of the knob, and the two ends of the tension spring are respectively connected to the hook parts protruding forward from the middle parts of the pressing blocks.

[0020] Further, a rotating groove is provided on the back surface of the adjusting main body in the installation chamber, and a rotating part is provided in the middle of the front side of the knob body, and the rotating part is rotatably inserted into the rotating groove;

[0021] Two limiting plates are provided on the outer periphery of the rotating groove at an interval of 180 degrees; two limiting grooves are provided on the outer periphery of the rotating part of the knob body at an interval of 180 degrees in the circumferential direction; and the two limiting plates are respectively located in the two limiting grooves;

[0022] When the limiting plates respectively abut against the two end parts in the circumferential direction of the limiting grooves, it corresponds to the convex part of the linkage part abutting against the pressing block and the concave part of the linkage part abutting against the pressing block.

[0023] Further, a vertically extending wavy structure is provided on the side edge of the adjusting groove, and this wavy structure is used for tight fitting with the end part of the pressing block.

[0024] Further, the bracket is in a frame shape, and the middle part of the frame shape is the adjusting groove; the bracket is integrally connected with the seat or detachably connected by a strap.

[0025] Further, there are two backrest plates, which are symmetrically arranged left and right; the backrest plates on both sides are detachably connected to the front side of the adjusting component through elastic cantilevers.

[0026] Further, a vibration motor is provided on the backrest plate.

[0027] Further, the backrest plate includes a frame plate and a flexible cushion; the frame plate has a structure with a rear concave in the middle, and there are several hollow holes on the frame plate; the rear side of the frame plate is connected to the adjusting component; the flexible cushion is disposed against the front side of the frame plate; the vibration motor is fixed to the rear side of the flexible cushion and is located in one of the hollow holes of the frame plate.

[0028] After adopting the above technical solution, when it is necessary to adjust the height of the backrest plate, the backrest plate can be conveniently slid up and down in the adjustment groove by controlling the adjusting component, and can be arbitrarily adjusted to any required height. The utility model is simple and convenient to operate, and the sliding and fixing are fast and convenient, which can improve the user's adjustment and use experience of the backrest plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a front three-dimensional view of an embodiment of the utility model;

[0030] Figure 2 It is a rear three-dimensional view of an embodiment of the utility model;

[0031] Figure 3 It is a left view of an embodiment of the utility model;

[0032] Figure 4 It is an exploded view of an embodiment of the utility model;

[0033] Figure 5 It is a cross-sectional view (one) of an embodiment of the utility model;

[0034] Figure 6 It is a cross-sectional view (two) of an embodiment of the utility model;

[0035] Figure 7 It is a partial exploded view (one) of an embodiment of the utility model;

[0036] Figure 8 It is a partial exploded view (two) of an embodiment of the utility model;

[0037] Figure 9 It is an exploded view of the backrest plate of an embodiment of the utility model.

[0038] Description of reference numerals: bracket 1, adjustment slot 11, side 111, wavy structure 112, adjustment assembly 2, adjustment part 21, adjustment main body 211, adjustment rear shell 212, installation chamber 213, chute 214, rotation slot 215, limiting plate 216, knob 22, knob main body 221, linkage part 222, convex part 2221, concave part 2222, rotation handle 223, rotation part 224, limiting slot 225, stop block 2251, pressing block 23, pressing part 231, arc convex surface 232, hook part 233, clamping slot 24, tension spring 25, connection part 26, connection main body 261, connection front cover 262, connection chamber 263, slot 264, spring slot 265, pressing plate 27, locking hook part 271, locking block 2711, pressing part 272, rotating shaft 273, spring 28, backrest plate 3, frame plate 31, hollow hole 311, flexible cushion 32, vibration motor 4, elastic cantilever 5, insert piece 51, insertion hole 511. Detailed implementation manners

[0039] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some but not all of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated herein can be arranged and designed in various different configurations.

[0040] As Figures 1 to 4 , a conveniently adjustable seat backrest structure of the present utility model includes a bracket 1, an adjustment assembly 2 and a backrest plate 3.

[0041] As Figure 2 and Figure 4 , an adjustment slot 11 extending vertically is provided in the middle of the bracket 1; for allowing the adjustment assembly 2 and the backrest plate 3 to adjust the height.

[0042] The front side of the adjustment assembly 2 is connected to the backrest plate 3; the backrest plate 3 is for a user to lean on the back and plays a supporting role. The backrest plate 3 can be configured with a concave middle part to relieve the back fatigue of the user during long sitting.

[0043] An adjustment part 21 is provided at the rear side of the adjustment assembly 2; the left and right ends of the adjustment part 21 are respectively in front-back limiting cooperation with the left and right sides of the adjustment slot 11, and the adjustment part 21 can reciprocally slide up and down or be positioned and fixed in the adjustment slot 11; and can be adjusted to any required height at will; the operation is simple and convenient, and the sliding and fixing are quick and convenient. Thus, the up-and-down movement adjustment of the backrest plate 3 can be realized by using the adjustment assembly 2 to adapt to people of different heights, and the adjustment and use experience of the backrest plate by the user can be improved.

[0044] Specifically, a knob 22 is provided on the back surface of the adjusting part 21, and two pressing blocks 23 are respectively provided on the left and right sides of the knob 22; the knob 22 rotates to drive the two pressing blocks 23 to slide at the left and right ends of the adjusting part 21, so as to movably press the two side edges 111 of the adjusting groove 11.

[0045] Thereby, when it is necessary to adjust the height of the backrest plate 3, first rotate the knob 22 to make the two pressing blocks 23 not press the two side edges 111 of the adjusting groove 11. At this time, the adjusting assembly 2 can drive the backrest plate 3 to slide up and down in the adjusting groove 11. After adjusting to any required height, rotate the reset knob 22 again to make the two pressing blocks 23 press the two side edges 111 of the adjusting groove 11 again, so as to realize the positioning and fixing of the adjusting assembly 2 and the backrest plate 3. The operation of the utility model is simple and convenient. Only by simply rotating the knob 22, the cooperation relationship between the adjusting assembly 2 and the adjusting groove 11 can be controlled, and the two pressing blocks 23 can be fixed at any height position in the adjusting groove 11. The sliding and fixing are fast and convenient, which can improve the user's adjustment and use experience of the backrest plate 3.

[0046] As Figure 4 and Figure 5 As shown, clamping grooves 24 penetrating up and down may be respectively provided at the left and right ends of the adjusting part 21 of this embodiment; the two side edges 111 of the adjusting groove 11 respectively extend into the clamping grooves 24 on the same side for front and rear position limitation, and can move up and down relative to the clamping grooves 24. The arrangement of the clamping grooves 24 can improve the sliding stability of the adjusting assembly 2 and prevent the adjusting assembly 2 from detaching from the bracket 1.

[0047] In this embodiment, the two pressing blocks 23 are respectively slidably assembled on the left and right sides of the adjusting part 21; the outer end of the pressing block 23 has a pressing part 231, and the pressing part 231 movably abuts against the side edge 111 of the adjusting groove 11, and the inner end of the pressing block 23 has an arc convex surface 232; the pressing part 231 can be made of a flexible material to tightly fit against the side edge 111 of the adjusting groove 11 and improve the tight-fitting effect.

[0048] The knob 22 is rotatably mounted on the adjusting part 21, and the knob body 221 of the knob 22 is located between the inner ends of the two pressing blocks 23; two linkage parts 222 are provided on the outer periphery of the knob body 221 at an interval of 180 degrees, and each linkage part 222 includes a convex part 2221 and a concave part 2222 that are circumferentially adjacent to each other; moreover, a tension spring 25 is connected between the two pressing blocks 23, and the tension spring 25 provides an elastic force to make the inner ends of the pressing blocks 23 abut against the linkage part 222; thus, when the knob 22 rotates so that the convex parts 2221 of the two linkage parts 222 simultaneously abut against the arc convex surfaces 232 of the two pressing blocks 23, the pressing part 231 of the pressing block 23 presses against the side 111 of the adjusting groove 11; when the knob 22 rotates so that the concave parts 2222 of the two linkage parts 222 simultaneously abut against the circular ring convex surfaces of the two pressing blocks 23, the pressing part 231 of the pressing block 23 releases the pressing on the side 111 of the adjusting groove 11.

[0049] The tension spring 25 provides an elastic force to make the two pressing blocks 23 approach each other, and the convex parts 2221 of the two connecting parts of the knob 22 are exactly located between the two pressing blocks 23, providing a reverse supporting force, so that the two pressing blocks 23 can press against the side 111 of the adjusting groove 11, preventing the adjusting assembly 2 from slipping out of the adjusting groove 11.

[0050] The arc convex surface 232 of the pressing block 23 is convenient for sliding cooperation with the linkage part 222, so that the rotation of the knob 22 can be converted into the left - right sliding of the pressing block 23 through the convex part 2221 and the concave part 2222.

[0051] Refer to Figure 7 and Figure 8 The adjusting part 21 includes an adjusting main body 211 and an adjusting rear shell 212; the adjusting rear shell 212 covers the rear side of the adjusting main body 211, and the two can be fixed by screwing.

[0052] An installation chamber 213 is provided between the adjusting rear shell 212 and the adjusting main body 211; the clamping grooves 24 are formed between the left and right sides of the adjusting rear shell 212 and the rear side of the adjusting main body 211 respectively.

[0053] The knob body 221 of the knob 22 is rotatably mounted in the middle of the installation chamber 213, and a rotating handle 223 exposed at the rear side of the adjusting rear shell 212 is provided at the rear side of the knob body 221; for the user to conveniently hold the rotating handle 223 and rotate the knob 22.

[0054] The two pressing blocks 23 are respectively mounted in the sliding grooves 214 on the left and right sides in the installation chamber 213; the tension spring 25 is located at the front side of the knob 22, and the two ends of the tension spring 25 are respectively connected to the hook parts 233 protruding forward from the middle of the pressing blocks 23.

[0055] On the back of the adjustment body 211 in the installation chamber 213, a rotation groove 215 may be provided. In the middle of the front side of the knob body 221, there is a rotation part 224, and the rotation part 224 is rotatably inserted into the rotation groove 215. On the outer periphery of the rotation groove 215, there are two limit plates 216 arranged at an interval of 180 degrees. On the outer periphery of the rotation part 224 of the knob body 221, there are two limit grooves 225 circumferentially spaced at 180 degrees. And the two limit plates 216 are respectively located in the two limit grooves 225. In this embodiment, the limit grooves 225 are respectively formed by enclosing between two stoppers 2251 protruding from the front surface of the rotation part 224.

[0056] When the limit plates 216 respectively abut against the stoppers 2251 at the two circumferential ends of the limit groove 225, the convex part 2221 of the linkage part 222 abuts against the pressing block 23 and the concave part 2222 of the linkage part 222 abuts against the pressing block 23. That is, when the knob 22 rotates, the cooperation between the limit plate 216 and the limit groove 225 can be used to prevent the knob 22 from rotating excessively, so that the knob 22 can only rotate back and forth within the range of the limit groove 225, ensuring that the contact part between the linkage part 222 and the pressing block 23 switches back and forth between the convex part 2221 and the concave part 2222. For example, refer to Figure 5 , in the shown state, at this time, the convex part 2221 of the linkage part 222 abuts against the pressing block 23, and the limit plate 216 abuts against one end of the limit groove 225 in the counterclockwise circumferential direction. When the knob 22 is controlled to rotate counterclockwise so that the groove of the linkage part 222 abuts against the pressing block 23, then the limit plate 216 should abut against the first end of the limit groove 225 in the clockwise circumferential direction.

[0057] In this embodiment, on the side 111 of the adjustment groove 11, a vertically extending wavy structure 112 is provided, and this wavy structure 112 is used for a tight fit with the end of the pressing block 23. To improve the fixed positioning effect of the adjustment assembly 2 and the adjustment groove 11.

[0058] In this embodiment, the bracket 1 is an independent frame-shaped structure, and the middle of the frame is the adjustment groove 11. And this bracket 1 can be detachably connected to the backrest of the seat itself through a strap (not shown in the figure) as an accessory.

[0059] Of course, the bracket 1 can also be designed to be integrally connected to the seat, that is, the backrest structure of the present utility model is directly used as the backrest of the seat.

[0060] Such as Figure 2 、 Figure 3 and Figure 9 shown, a vibration motor 4 may be provided on the backrest plate 3. By using this vibration motor 4, the massage function of the backrest plate 3 can be realized to massage the back of the user.

[0061] Specifically, the backrest plate 3 in this embodiment includes a frame plate 31 and a flexible cushion 32.

[0062] The frame plate 31 is generally structured with a rear concave in the middle, and a number of hollow holes 311 are provided on the frame plate 31; hereby, the weight of the frame plate 31 is reduced, and the structural strength is ensured.

[0063] The rear side of the frame plate 31 is connected to the adjustment assembly 2; the flexible cushion 32 is arranged in a close-contact manner on the front side of the frame plate 31; the vibration motor 4 is fixed to the rear side of the flexible cushion 32 and is located within one of the hollow holes 311 of the frame plate 31.

[0064] Thereby, by directly fixing the vibration motor 4 on the flexible cushion 32, a better massage effect can be achieved. The flexible cushion 32 can be a silica gel pad or the like.

[0065] As Figure 1 、 Figure 2 and Figure 9 shown, there are two backrest plates 3 in this embodiment, and they are symmetrically arranged left and right; the backrest plates 3 on both sides can be detachably connected to the front side of the adjustment assembly 2 through elastic cantilevers 5 respectively. The elastic cantilever 5 in this embodiment takes the "U"-shaped spring sheet structure as an example.

[0066] In this embodiment, two symmetrically arranged connection parts 26 are provided on the front side of the adjustment assembly 2; the two connection parts 26 can be respectively arranged on the front sides of the left and right ends of the adjustment part 21.

[0067] The elastic cantilever 5 and the connection part 26 can be detachably connected by screws, or the following structure can be adopted for quick disassembly and assembly. Refer to Figure 7 and Figure 8 ; the connection part 26 includes a connection main body 261 and a connection front cover 262, and the connection front cover 262 covers the front side of the connection main body 261, and the two can be fixed by screwing.

[0068] A connection chamber 263 is formed between the connection front cover 262 and the connection main body 261, and one side of the connection chamber 263 has a slot 264 communicating with the outside; the front end of the elastic cantilever 5 can be fixedly connected to the backrest plate 3 by screwing, the rear end of the elastic cantilever 5 has an insertion piece 51, the insertion piece 51 has an insertion hole 511, and the insertion piece 51 is inserted into the slot 264;

[0069] A rotatable pressing plate 27 is installed in the connection chamber 263. One end of the pressing plate 27 is a locking hook portion 271 which is located within the connection chamber 263. A locking block 2711 protrudes from the locking hook portion 271. The other end of the pressing plate 27 is a pressing portion 272 which extends out of the connection chamber 263, and the pressing portion 272 is connected with a spring 28. The spring 28 jacks up the pressing portion 272 to drive the locking hook portion 271 to rotate, so that the locking block 2711 is inserted into the jack 511 of the insert piece 51 located within the slot 264.

[0070] Thus, the backrest plate 3 of this embodiment can realize the quick disassembly and assembly operation with the connecting portion 26 of the adjusting assembly 2 through the insert piece 51 of the elastic cantilever 5, which is convenient for replacing, repairing the backrest plate 3, and so on.

[0071] Specifically, the connection front cover 262 covers the outside of the connection main body 261 far from the middle of the adjusting assembly 2, and a spring groove 265 is provided inside the connection main body 261; the pressing portion 272 of the pressing plate 27 is spaced in front of the spring groove 265; the spring 28 is installed in the spring groove 265, and both ends of the spring 28 respectively abut against the bottom of the spring groove 265 and the rear side of the pressing portion 272. The spring 28 jacks up the pressing portion 272 of the pressing plate 27 forward, so that the locking hook portion 271 can firmly buckle the insert piece 51 within the slot 264 backward; when it is necessary to disassemble the backrest plate 3, only need to press the pressing portion 272, squeeze the spring 28, drive the pressing plate 27 to rotate, so that the locking block 2711 of the locking hook portion 271 disengages from the jack 511 of the insert piece 51, and then the insert piece 51 can be pulled out of the slot 264 to realize the separation of the backrest plate 3 and the connecting portion 26.

[0072] In this embodiment, a rotating shaft 273 is provided between the locking hook portion 271 and the pressing portion 272 of the pressing plate 27, and the rotating shaft 273 is rotatably installed in the installation chamber 213; to facilitate the rotation of the pressing plate 27.

[0073] Meanwhile, one side of the locking block 2711 close to the opening of the slot 264 may have an inclined surface in this embodiment. Thus, it is convenient for the insert piece 51 to be inserted into the slot 264, which can automatically drive the locking hook portion 271 to tilt up, and then enable the locking block 2711 to be quickly positioned and inserted into the jack 511 of the insert piece 51 to realize the quick installation operation.

[0074] The above are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, equivalent changes and modifications made without departing from the principle of the present invention should still fall within the protection scope of the present invention.

[0075] In the description of the embodiments of the present application, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0076] In the description of the embodiments of the present application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that allows mutual communication; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0077] In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

Claims

1. A convenient and adjustable seat back structure, characterized in that: It includes a bracket, an adjustment component and a backrest plate; An adjustment groove extending up and down is provided in the middle of the bracket; The front side of the adjustment component is connected to the backrest plate; An adjustment part is provided on the rear side of the adjustment component; The left and right ends of the adjustment part are respectively in front and rear limit cooperation with the left and right sides of the adjustment groove, and the adjustment part can slide up and down reciprocally or be positioned and fixed in the adjustment groove.

2. The convenient and adjustable seat back structure according to claim 1, characterized in that: A knob is provided on the back of the adjustment part, and two pressing blocks are respectively provided on the left and right sides of the knob; when the knob rotates, it drives the two pressing blocks to slide at the left and right ends of the adjustment part to actively press the two sides of the adjustment groove.

3. The convenient and adjustable seat back structure according to claim 2, wherein: Upper and lower through clamping grooves are respectively provided at the left and right ends of the adjustment part; the two sides of the adjustment groove respectively extend into the clamping grooves on the same side for front and rear limitation, and can move up and down relative to the clamping grooves.

4. A conveniently adjustable seat back structure according to claim 3, characterized in that: The adjustment part includes an adjustment main body and an adjustment rear shell; the adjustment rear shell covers the rear side of the adjustment main body, and the clamping grooves are respectively formed between the left and right sides of the adjustment rear shell and the rear side of the adjustment main body.

5. The adjustable seat back structure according to claim 2, characterized in that: The two pressing blocks are respectively slidably assembled on the left and right sides of the adjustment part; the outer end of the pressing block has a pressing part, the pressing part actively abuts against the side of the adjustment groove, and the inner end of the pressing block has an arc convex surface; The knob is rotatably installed on the adjustment part, and the knob body of the knob is located between the inner ends of the two pressing blocks; two linkage parts are provided on the outer circumference of the knob body at an interval of 180 degrees, and each linkage part includes a convex part and a concave part distributed adjacent to each other in the circumferential direction; A tension spring is connected between the two pressing blocks, and the tension spring provides elastic force to make the inner ends of the pressing blocks abut against the linkage parts; When the convex parts of the two linkage parts simultaneously abut against the arc convex surfaces of the two pressing blocks when the knob rotates, the pressing parts of the pressing blocks press the side of the adjustment groove; when the concave parts of the two linkage parts simultaneously abut against the circular ring convex surfaces of the two pressing blocks when the knob rotates, the pressing parts of the pressing blocks release the pressing on the side of the adjustment groove.

6. The structure of a conveniently adjustable seat backrest according to claim 5, characterized in that: The adjustment part includes an adjustment main body and an adjustment rear shell; the adjustment rear shell covers the rear side of the adjustment main body, and an installation chamber is provided between the adjustment rear shell and the adjustment main body; The knob body of the knob is rotatably installed in the middle of the installation chamber, and a rotating handle exposed at the rear side of the adjustment rear shell is provided at the rear side of the knob body; the two pressing blocks are respectively installed in the sliding grooves on the left and right sides in the installation chamber; the tension spring is located in front of the knob, and the two ends of the tension spring are respectively connected to the hook parts protruding forward from the middle of the pressing blocks.

7. The adjustable seat backrest structure according to claim 6, wherein: A rotating groove is provided on the back of the adjustment main body in the installation chamber, and a rotating part is provided in the middle of the front side of the knob body, and the rotating part is rotatably inserted into the rotating groove; Two limiting plates are provided on the outer circumference of the rotating groove at an interval of 180 degrees; two limiting grooves are provided on the outer circumference of the rotating part of the knob body at an interval of 180 degrees in the circumferential direction; and the two limiting plates are respectively located in the two limiting grooves; When the limiting plates respectively abut against the two end parts in the circumferential direction of the limiting grooves, it corresponds to the convex part of the linkage part abutting against the pressing block and the concave part of the linkage part abutting against the pressing block.

8. A conveniently adjustable seat back structure according to claim 2, characterized in that: A wave-shaped structure extending vertically is provided on the side of the adjustment groove, and this wave-shaped structure is used for tight cooperation with the end part of the pressing block.

9. A conveniently adjustable seat back structure according to claim 1, characterized in that: The bracket is in a frame shape, and the middle part of the frame shape is the adjustment groove; the bracket is integrally connected or detachably connected to the seat.

10. A conveniently adjustable seat back structure according to claim 1, characterized in that: There are two backrest plates, which are symmetrically arranged left and right; the backrest plates on both sides are respectively detachably connected to the front side of the adjustment assembly through elastic cantilevers; a vibration motor is provided on the backrest plates; the backrest plates include a frame plate and a flexible cushion; the frame plate has a structure with a concave rear in the middle, and a number of hollow holes are provided on the frame plate; the rear side of the frame plate is connected to the adjustment assembly; the flexible cushion is arranged in a close-contact manner on the front side of the frame plate; the vibration motor is fixed to the rear side of the flexible cushion and is located in one of the hollow holes of the frame plate.

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