Self-adjusting backrest of seat

Abstract

The invention provides a self-adjusting backrest of a seat, which comprises a backrest bracket serving as a supporting and mounting carrier; the backrest body is arranged at the front end of the backrest support and can move front and back, an elastic assembly is arranged between the backrest support and the backrest body, and the elastic assembly enables the backrest body to have a forward movement trend; the main side wings are located on the two sides of the backrest body and hinged to the backrest support; the linkage mechanism is arranged between the backrest body and the main side wings and used for converting front-back movement of the backrest body into front-back rotation of the main side wings and achieving self-adaptive wrapping. The self-adjusting backrest of the seat is compact in structure, low in manufacturing cost, capable of achieving self-adaptive adjustment of the side wings, good in wrapping performance, comfortable and safe to use and wide in application range.

Description

Technical Field

[0001] The invention relates to a seat, in particular to a self-adjusting backrest of the seat. Background Art

[0002] A child stroller is a travel tool designed for infants and young children, which is convenient for adults to carry infants and young children when going out; it includes a frame, a bottom of the frame is provided with rollers, a rear end of the frame is provided with a push handle, the frame is installed with a child seat, the seat includes a seat body 1 and a backrest, and because infants and young children are young, side wings need to be provided on both sides of the backrest to protect the infants and young children, ensure the sitting posture, and prevent them from swinging too much to the left and right; in the prior art, the side wings are fixed structures, which cannot ensure that they fully fit the human body, especially for infants and young children of different ages and different body shapes, their adaptability is not ideal, which seriously affects the comfort and safety of use. Summary of the invention

[0003] Technical issues to be solved

[0004] The technical problem to be solved by the present invention is to provide a self-adjusting seat backrest which has a compact structure, can realize adaptive adjustment of side wings, has a high degree of fit, good wrapping, and is comfortable and safe to use.

[0005] Technical solutions to the problem

[0006] The present invention provides a self-adjusting seat backrest, which comprises:

[0007] Backrest bracket 2, serving as a support and mounting carrier;

[0008] The backrest body 3 is arranged at the front end of the backrest bracket 2 and can move forward and backward. An elastic component is arranged between the backrest bracket 2 and the backrest body 3, and the elastic component makes the backrest body 3 have a tendency to move forward;

[0009] Main side wings 4, located on both sides of the backrest body 3 and hinged on the backrest bracket 2;

[0010] The linkage mechanism is arranged between the backrest body 3 and the main side wings 4, and is used to convert the front and rear movement of the backrest body 3 into the front and rear rotation of the main side wings 4 and realize adaptive wrapping.

[0011] Furthermore, the linkage mechanism includes a gear 62 rigidly fixed on the rotating shaft 61 of the main side wing 4, two racks 63 slidably fitted on the front end of the backrest bracket 2 and respectively meshing with the two gears 62, and an inclined guide assembly arranged between the rear end of the backrest body 3 and the racks 63. The inclined guide assembly can convert the forward and backward movement of the backrest body 3 into axial sliding of the rack and thereby drive the main side wing 4 to rotate.

[0012] Furthermore, the oblique guide assembly includes an oblique guide groove 310 arranged at the rear end of the backrest body 3 and a pin 631 arranged on the side wall of the rack 63 and sleeved in the oblique guide groove 310 , and the length direction of the oblique guide groove 310 is inclined to the movement direction of the backrest body 3 .

[0013] Furthermore, the angle between the length direction of the inclined guide groove 310 and the movement direction of the backrest body 3 is greater than or equal to 30 degrees and less than 45 degrees.

[0014] Furthermore, a guide plate 31 is fixed to the rear end face of the backrest body 3, and the length direction of the guide plate 31 is parallel to the sliding direction of the rack 63. There are two guide plates 31 and they are arranged in parallel. A guide area for accommodating the head of the rack 63 is formed between the two guide plates 31. The pin shaft is fixed to the head of the rack 63 and its end is sleeved in an inclined guide groove 310 opened on the side wall of the guide plate 31.

[0015] Furthermore, the rack includes a first plate body 632, the tail of the first plate body 632 is bent backward to form a connecting portion 633, the end of the connecting portion 633 is bent in the opposite direction to form a second plate body 634 parallel to the first plate body 632, the backrest bracket 2 is provided with a slide groove for accommodating the second plate body 634 to be inserted and realize horizontal sliding, the front end surface of the second plate body 634 is provided with teeth 635 to form a rack, and a shaft body is fixed to the head of the first plate body 632, and the two ends of the shaft body form the pin shaft 631.

[0016] Furthermore, the rear end surface of the backrest body 3 is concave inwardly and forms a first mounting groove, and the guide plate is arranged in the first mounting groove.

[0017] Furthermore, the edge of the main wing 4 is hinged with a secondary wing 5, and a connecting rod assembly is provided between the secondary wing 5 and the main wing 4 to form a four-bar structure and realize linkage, so that the secondary wing always maintains a substantially unchanged opening and closing degree.

[0018] Furthermore, the connecting rod assembly includes a first connecting rod 72 hinged at the rear end edge of the main wing 4 and a second connecting rod 73 hinged at the end of the first connecting rod 72, the end of the second connecting rod 73 is hinged at the rear end edge of the secondary wing, and the rotation axes of the first connecting rod and the second connecting rod are parallel to the rotation axis of the secondary wing 5 and are not coaxial.

[0019] Furthermore, both side edges of the backrest bracket 2 extend outward and bend forward in an arc shape to form a protection portion 2a, and the connecting rod assembly is located directly in front of the protection portion 2a.

[0020] Furthermore, the connecting rod assemblies are multiple groups and are arranged in parallel, and the multiple groups of connecting rod assemblies are connected by shafts 71 and can achieve synchronous rotation.

[0021] Furthermore, the rear end edge of the main wing 4 is provided with a first hinge seat 42 for mounting a first connecting rod 72 , and there are two first hinge seats 42 arranged in parallel. The rear end edge of the secondary wing 5 is provided with a second hinge seat 51 for mounting a second connecting rod 73 .

[0022] Furthermore, a groove is provided at the rear end edge of the main wing 4 and the rear end edge of the auxiliary wing 5, and the first hinge seat 42 and the second hinge seat 51 are respectively disposed in the two grooves.

[0023] Furthermore, two third hinge seats 41 are provided at the rear end of the main side wing 4, a transmission shaft 61 is rigidly fixed between the two third hinge seats 41, a gear 62 is rigidly fixed on the transmission shaft 61, and both ends of the transmission shaft 61 are hinged on the fourth hinge seat 21 of the backrest bracket 2 to realize the rotational connection of the main side wing.

[0024] Furthermore, the elastic component is a spring component and the elastic force is adjustable.

[0025] Furthermore, a pressure plate 83 capable of moving forward and backward is provided at the front end of the backrest bracket 2, and a plurality of springs 82 are provided between the front end surface of the pressure plate 83 and the rear end surface of the backrest body 3. An adjusting bolt 84 is threadedly connected to the rear end of the backrest bracket 2. The end of the adjusting bolt 84 passes through the backrest bracket 2 and contacts with the pressure plate 83, and can push the pressure plate to move forward, thereby adjusting the clamping force of the spring.

[0026] Furthermore, a support plate 81 is fixed to the rear end of the backrest body 3 , and two ends of the spring 82 are respectively fixed to the support plate 81 and the pressure plate 83 .

[0027] Furthermore, the support plate 81 and the pressure plate 83 are provided with sleeve holes 811 for fixing the spring 82 .

[0028] Furthermore, the socket hole is formed by stamping.

[0029] Furthermore, the head of the adjusting bolt 84 is provided with an adjusting handle.

[0030] Furthermore, the pressing plate 83 is slidably mounted on the front end of the backrest bracket 2 via a guide rod, and the movement direction of the pressing plate 83 is parallel to the movement direction of the backrest body 3 .

[0031] Furthermore, the pressing plate 83 includes an upper pressing plate and a lower pressing plate which are arranged in parallel and respectively located at the upper and lower ends of the inclined guide assembly. The upper pressing plate and the lower pressing plate are connected by a connecting plate to form an "I"-shaped structure, and the connecting plate is located between the two racks.

[0032] Furthermore, a groove is formed on the guide plate 31 at the rear end of the backrest body 3. The groove is located directly in front of the connecting plate and increases the moving space for the connecting plate to move forward.

[0033] Furthermore, the ratio of the rotation angle of the main wing 4 to the moving distance of the backrest body 3 is 2°-3° / mm.

[0034] Furthermore, the movement stroke of the backrest body 3 is less than or equal to 15 mm.

[0035] Furthermore, a plurality of recessed holes 201 are provided at the rear end of the backrest bracket 2, an axial hole is provided at the bottom of the recessed hole 201, a bolt 202 passes through the axial hole forward and is fixedly connected to the backrest body 3, the bolt 202 forms a guide rod and realizes the sliding connection of the backrest body 3, and the depth of the recessed hole is greater than or equal to the maximum movement stroke of the backrest body 3.

[0036] Furthermore, a mounting column 301 coaxial with the recessed hole 201 and used for connecting with the bolt is provided at the rear end of the backrest body 3, and the end of the mounting column can contact with the end of the recessed hole 201 to achieve positioning.

[0037] Beneficial Effects

[0038] The self-adjusting backrest of the seat of the present invention adopts movably connected side wings, and is connected to the backrest body through a linkage mechanism. The angle adjustment of the side wings is realized by the pressure of the backrest, so as to realize adaptive adjustment. The seat can be used by infants and young children of different age groups, body shapes and weights, improves the fit and wrapping of the human body, and has good comfort and high safety. The linkage auxiliary side wings are arranged, which can further improve the wrapping and keep the opening and closing degree unchanged, so that the seat is comfortable and safe to use. The gear rack drive is adopted, so that the manufacturing cost is low, the transmission is stable and reliable, and the driving force is large, and the driving effect is good. The inclined guide groove structure is adopted to convert the movement of the backrest into the movement of the rack, so that the structure is compact, the installation volume is small, and the use is stable and reliable. The movably connected backrest bracket and the backrest body are realized by bolts, so that the manufacturing cost is low, the limit position of the backrest body can be quickly adjusted, and the use of different models of seats is satisfied, so that the seat has good versatility. The concave hole structure is arranged, so that the bolt head can be hidden, so that the compactness and aesthetics of the overall structure are improved, and the bolt head is prevented from being exposed and contacting with foreign objects or the human body during movement. The double guide plate structure is set to form a double inclined guide groove, which has good driving stability and high reliability; the rack adopts a plate structure, with a small installation space, a large contact area with the gear, a large driving force, and good driving stability; the rack is a Z-shaped structure, which provides a moving space for the elastic adjustment mechanism, further reducing the overall installation thickness; an adjustable elastic component is set, which can adjust the damping force of the spring on the backrest body according to needs, so as to meet the use of infants and young children of different age groups and weights, with a wide range of applicable scenarios and good use effect; the spring pressing force is adjusted by bolts, with a compact structure, low cost, convenient and labor-saving adjustment, a large adjustment range, and a self-locking function; a groove body is opened on the guide plate to provide a moving space for the pressure plate, further increasing the adjustment range of the elastic force; the self-adjusting backrest of the seat of the present invention has a compact structure, low manufacturing cost, can realize adaptive adjustment of the side wings, good wrapping, comfortable and safe use, and a wide range of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the structure of the self-adjusting backrest of the seat of the present invention;

[0040] Figure 2 Another structural schematic diagram of the self-adjustable backrest of the chair of the present invention at another angle;

[0041] Figure 3 A cross-sectional view of the self-adjusting backrest of the seat of the present invention;

[0042] Figure 4 for Figure 3 Enlarged view of part A in the middle;

[0043] Figure 5 This is a schematic diagram of the internal structure of the self-adjusting backrest of the seat of the present invention;

[0044] Figure 6 for Figure 5 Enlarged view of middle part B;

[0045] Figure 7 for Figure 5 Enlarged view of middle C;

[0046] Figure 8 A schematic diagram of the connection between the main wing and the auxiliary wing of the self-adjustable backrest of the seat of the present invention;

[0047] Fig. 9 It is a structural schematic diagram of the linkage mechanism of the self-adjusting backrest of the seat of the present invention;

[0048] Fig.10 It is a schematic structural diagram of another angle of the linkage mechanism of the self-adjusting backrest of the seat of the present invention;

[0049] Fig.11 It is a schematic diagram of the installation of the linkage mechanism of the self-adjusting backrest of the seat of the present invention;

[0050] Fig.12 It is a schematic diagram of the structure of the rack of the self-adjusting backrest of the seat of the present invention;

[0051] Fig.13 It is a schematic diagram of the installation of the elastic component of the self-adjusting backrest of the seat of the present invention;

[0052] Fig.14 It is a schematic structural diagram of the elastic component of the self-adjusting backrest of the seat of the present invention;

[0053] Fig.15 It is a structural schematic diagram of the inclined guide assembly of the self-adjusting backrest of the seat of the present invention;

[0054] Fig.16 The figure is a schematic diagram of the use state of the self-adjusting backrest of the seat of the present invention. DETAILED DESCRIPTION

[0055] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0056] See also Figure 1-Figure 16The present invention provides a self-adjusting seat backrest, which is suitable for a child seat, especially a child stroller, and comprises a backrest bracket 2, a backrest body 3, main side wings 4 and a linkage mechanism; wherein the backrest bracket 2 is used as a support and mounting carrier for connecting with the seat body or the frame, and at the same time as a mounting carrier for the backrest body 3, the main side wings 4 and the linkage mechanism, and the backrest bracket 2 is made of plastic, which has the advantages of high strength and light weight; the backrest body 3 is movably connected to the front end of the backrest bracket 2, and can realize forward and backward movement, and at the same time, an elastic component is provided between the backrest bracket 2 and the backrest body 3, and the elastic component enables the backrest to be adjusted. The back body 3 has a tendency to move forward, thereby providing a restoring elastic force and generating movement damping for the back body 3; there are two main side wings 4 and they are respectively located on both sides of the back body 3, and the two main side wings 4 are both hinged on the back support 2, which are also located at the front end of the back support 2; the linkage mechanism is arranged between the back body 3 and the main side wings 4, which is used to convert the forward and backward movement of the back body 3 into the forward and backward rotation of the main side wings 4, and then can realize adaptive (autonomous) adjustment according to different backrest pressures, so that the main side wings can fully fit the two sides of the human body, improve the overall inclusiveness of the seat, and then improve the comfort and safety of use.

[0057] The two racks are symmetrically arranged, and the teeth on the rack 63 are meshed with the gears. The axial sliding of the rack 63 can drive the gear 62 to rotate, thereby driving the main side wing 4 to rotate, thereby realizing the wrapping adjustment. The oblique guide assembly is arranged between the rear end of the backrest body 3 and the rack 63. The oblique guide assembly can convert the forward and backward movement of the backrest body 3 into the axial (horizontal) sliding of the rack, thereby driving the main side wing 4 to rotate, thereby realizing the backrest body 3 and the main side When the backrest body 3 is moved backward, the main side wings 4 can be rotated forward through the linkage mechanism to improve the fit. The greater the force on the backrest body 3 and the greater the distance moved backward, the greater the angle of the main side wings 4 to rotate forward. When the backrest body loses its supporting force, it is reset forward under the action of elastic force, and the main side wings rotate backward and reset synchronously. When the infant leans back and exerts backward pressure on the backrest body 3, and pushes the backrest body to overcome the spring force and move backward, the main side wings 4 are rotated forward and fit the human body through the linkage mechanism, thereby improving the wrapping of the infant, and improving the comfort and safety of use. When the infant is separated from the backrest body, the backrest body is reset forward, and the main side wings are reset backward at the same time, which is convenient for the infant's independent activities, that is, it reduces the interference of the main side wings on the infant, and at the same time, it is convenient for the infant to enter and exit, with good use effect and wide application range, and is suitable for infants of different age groups and different body shapes and weights.

[0058] Two third hinge seats 41 are provided at the rear end of the main wing 4, a transmission shaft 61 is rigidly fixed between the two third hinge seats 41, a gear 62 is rigidly fixed on the transmission shaft 61, and both ends of the transmission shaft 61 are hinged on the fourth hinge seat 21 at the front end of the backrest bracket 2, thereby realizing the rotational connection of the main wing on the backrest bracket.

[0059] In the present application, the ratio of the rotation angle of the main side wing 4 to the moving distance of the backrest body 3 is 2°-3° / mm, that is, for every 1mm movement of the backrest body 3, the main side wing 4 rotates 2°-3°, and the greater the moving distance of the backrest body 3, the greater the rotation angle of the main side wing 4; in this embodiment, the movement stroke of the backrest body 3 is less than or equal to 15mm.

[0060] The following is a detailed description of each component in conjunction with the accompanying drawings:

[0061] See also Figure 3 and Figure 4The rear end of the backrest bracket 2 is provided with a plurality of recessed holes 201, which are circular holes, and the front end of the backrest bracket is a circular boss convex forward, and an axial hole is opened at the bottom of the recessed hole 201. The bolt 202 passes through the axial hole forward and is fixedly connected to the backrest body 3. The length of the bolt 202 is greater than the distance between the end of the recessed hole and the backrest body 3. Therefore, the bolt 202 forms a guide rod, which can realize the movable connection of the backrest body 3 at the front end of the backrest bracket 2, that is, it can realize the front and rear sliding connection. The head of the bolt 202 is located in the recessed hole 201 for limiting. In this embodiment, the depth of the recessed hole is greater than or equal to the maximum movement stroke of the backrest body 3, which can always make the backrest body 3 movable. The bolt head is located in the recessed hole 201 to avoid protrusion and exposure, and to avoid contact with objects or people at the rear end of the backrest bracket 2, thereby improving the compactness of the structure and achieving good use effect; in this embodiment, in order to improve the connection strength, a plurality of mounting columns 301 are provided at the rear end of the backrest body 3, and the mounting columns 301 are multiple and respectively coaxial with each recessed hole 201, and a screw hole is provided at the end of the mounting column, which is used for threaded connection with the bolt to realize the connection between the backrest body 3 and the backrest bracket 2, and at the same time, the end of the mounting column can contact the end of the recessed hole 201, thereby realizing the movement limit of the backrest body; in this application, there are at least four of the above-mentioned recessed holes, and they are symmetrically arranged on the backrest bracket 2.

[0062] See also Fig.10 , Fig.13 The oblique guide assembly includes an oblique guide groove 310 and a pin 631, wherein the oblique guide groove 310 is arranged at the rear end of the backrest body 3, and can move with the movement of the backrest body 3. The oblique guide grooves are two (groups) and are symmetrically arranged, respectively used to drive the two racks to move. When driven, the two racks can achieve synchronous movement toward each other or back to back, so that the main side wings on both sides can achieve synchronous movement; the length direction of the oblique guide groove 310 is inclined to the movement direction of the backrest body 3. In this embodiment, the angle between the length direction of the oblique guide groove 310 and the movement direction of the backrest body 3 is greater than or equal to 30 degrees and less than 45 degrees; the pin 631 is arranged on the side wall of the rack 63, and is sleeved in the oblique guide groove 310. The axis of the pin is perpendicular to the length direction of the inclined guide groove. When the backrest body moves backward, under the guidance of the inclined guide groove, the pin moves horizontally inward or outward, thereby pushing the rack to move horizontally; in order to facilitate the overall layout and installation, in the present application, when the backrest body 3 moves backward, under the action of the inclined guide groove, the rack can move horizontally outward, which can enable the rack to be installed on the backrest bracket, which is convenient for the overall layout of the backrest; therefore, when the backrest body 3 is located at the front limit position, the pin (rack) is located at the inner limit position, that is, the distance between the two racks is the shortest, and when the backrest body 3 is located at the rear limit position, the pin (rack) is located at the outer limit position, that is, the distance between the two racks is the farthest.

[0063] See also Fig.15In order to improve the driving balance, reliability and stability, a guide plate 31 is fixed to the rear end face of the backrest body 3. The plane where the guide plate 31 is located is perpendicular to the rear end face of the backrest body, and the length direction of the guide plate 31 is parallel to the sliding direction of the rack 63. The guide plates 31 are two and are arranged in parallel up and down. A guide area is formed between the two guide plates 31. The upper and lower widths of the guide area are the same as the width of the rack, which is used to accommodate the head of the rack 63. The oblique guide groove 310 is symmetrically opened on the guide plate 31, and the head of the rack can just be sleeved in the guide area to form a guiding effect on the rack. The pin is fixed to the head of the rack 63, and its end is sleeved in the oblique guide groove. Through the above arrangement, the generation of the pin force arm can be reduced or avoided, and the driving stability and reliability can be improved. At the same time, a certain radial limit is formed on the rack to form a guide for its axial sliding.

[0064] In order to reduce the installation space, that is, to reduce the overall thickness, in this embodiment, the rear end surface of the backrest body 3 is concave to form a first installation groove 30, and the guide plate 31 is arranged in the first installation groove 30 to reduce the thickness ratio of the inclined guide groove (guide plate).

[0065] See also Fig. 9 , Fig.11 and Fig.12 The rack is a plate-like structure as a whole, which can increase the contact area with the gear, improve the driving force and driving stability, and at the same time reduce the installation space. In the present application, the rack is Z-shaped, which can further reduce the installation thickness and provide installation and operation space for the adjustable spring assembly; specifically, the rack includes a rectangular first plate body 632, the tail of the first plate body 632 is bent 90 degrees backward (at the rear end of the backrest) to form a connecting portion 633, the width of the connecting portion is relatively small, and the end of the connecting portion 633 is bent in the opposite direction (outward) to form a second plate body 634, and the second plate body 634 is parallel to the first plate body 632 The second plate 634 is formed into a Z-shaped structure. At the same time, a slide groove is provided on the backrest bracket 2, which can accommodate the second plate 634 to be inserted and realize horizontal sliding. Two parallel strip protrusions 22 are provided on the front end surface of the backrest bracket. A slide groove is formed between the two strip protrusions. The second plate 634 (rack) is slidably fitted in the slide groove to realize radial limiting. Teeth 635 are provided on the front end surface of the second plate 634 to form a rack (plate). A shaft body is fixed to the head of the first plate body 632. The two ends of the shaft body extend outside the first plate body to form a pin 631 for connecting with the inclined guide groove.

[0066] In order to adapt to the use of infants and young children of different ages, body shapes and weights, in the present application, the elastic component is a spring component, and its elastic force is adjustable, that is, the elastic force (damping) of the backrest body 3 can be adjusted; see Figure 9-11 , Figure 13-Figure 14A pressure plate 83 is provided at the front end of the backrest bracket 2, and the pressure plate 83 can be moved forward and backward. A plurality of springs 82 are provided between the front end surface of the pressure plate 83 and the rear end surface of the backrest body 3. At the same time, an adjusting bolt 84 is threadedly connected to the rear end of the backrest bracket 2. After the end of the adjusting bolt 84 passes through the backrest bracket 2, it contacts the pressure plate 83. When the adjusting bolt 84 is screwed forward, it can push the pressure plate to move forward, thereby compressing the spring and increasing the clamping force of the spring on the backrest body; when the adjusting bolt 84 is screwed backward, the pressure plate moves backward under the action of the elastic force, so that the spring stretches, reducing the clamping force on the backrest, thereby realizing the adjustment of the damping pressure of the backrest to meet different usage requirements; the contact point between the above-mentioned adjusting bolt and the pressure plate is at the center of the pressure plate, which avoids eccentricity and causes the pressure plate to deflect, and improves the stability and reliability of the adjustment; an adjusting handle is provided at the head of the adjusting bolt 84, which is convenient for manual adjustment, does not require tools, and is convenient and labor-saving to adjust.

[0067] In the present application, a support plate 81 is fixed at the rear end of the backrest body 3. The support plate is strip-shaped and horizontally arranged. There are two of them, and they are respectively arranged at the upper and lower ends of the guide area. The two ends of the spring 82 are respectively fixed on the support plate 81 and the pressure plate 83; specifically, a plurality of socket holes 811 are provided on the support plate 81 and the pressure plate 83. The pressure plate 83 is a raised hole that can accommodate the end steel wire of the spring to pass through, thereby achieving a fixed connection and avoiding detachment. The socket hole is formed by stamping.

[0068] The pressure plate 83 includes an upper pressure plate and a lower pressure plate which are arranged in parallel. The upper pressure plate and the lower pressure plate are respectively located at the upper and lower ends of the inclined guide assembly (guide area), which correspond to the two support plates respectively. The upper pressure plate and the lower pressure plate are connected by a connecting plate to form an "I"-shaped structure. The connecting plate is located between the two racks, and the center of the connecting plate serves as the contact point with the adjusting bolt; springs are respectively arranged at both ends of the upper pressure plate, the lower pressure plate and the support plate; at the same time, a groove body is opened on the guide plate 31 at the rear end of the backrest body 3, and its body is located just in front of the connecting plate, and its width is slightly larger than the width of the connecting plate, which can accommodate the connecting plate, thereby increasing the moving space for the forward movement of the connecting plate, that is, increasing the moving distance of the pressure plate, and then increasing the adjustment range of the spring force.

[0069] In the present application, both the pressure plate and the support plate are metal plates to ensure sufficient support strength; the pressure plate 83 is slidably mounted on the front end of the backrest bracket 2 through a guide rod or bolt, and its movement direction is parallel to the movement direction of the backrest body 3.

[0070] In order to further improve the fit and wrapping, the present application also provides a secondary side wing 5, see Figure 1-Figure 3 , Figure 5-Figure 9The secondary side wing 5 is plate-shaped and has a certain curvature. It consists of two and is respectively hinged on the edges of the two main side wings 4. The front end surface of the secondary side wing 5 and the front end surface of the main side wing form a wrapping surface. A connecting rod assembly is provided between the secondary side wing 5 and the main side wing 4. The rotation of the main side wing can drive the secondary side wing 5 to rotate, so as to achieve linkage; the connecting rod assembly is arranged at the rear ends of the main side wing and the rear side wing. When the main side wing rotates forward, the secondary side wing can rotate outward, so that the secondary side wing always has a stable opening, and the opening is basically unchanged and will not increase or decrease with the rotation of the main side wing; specifically, the connecting rod assembly includes a first connecting rod 72 and a second connecting rod 73. The first connecting rod 72 is hinged on the rear end edge of the main side wing 4, the second connecting rod 73 is hinged on the end of the first connecting rod 72, and the end of the second connecting rod 73 is hinged At the rear end edge of the secondary wing, the secondary wing and the main wing are matched with the rotating shaft, and the rotation axes of the first connecting rod and the second connecting rod are parallel to the rotation axis of the secondary wing 5, and are not coaxial, forming a four-link structure, which is used to ensure that the secondary wing always has a stable opening and closing degree; in the present application, a first hinge seat 42 is provided at the rear end edge of the main wing 4, which is used to install the first connecting rod 72, and the first hinge seat 42 is two and arranged in parallel. A second hinge seat 51 is provided at the rear end edge of the secondary wing 5, which is used to install the second connecting rod 73, and the second hinge seat 51 is also two and arranged in parallel. It can install two groups of connecting rod assemblies, and the hinge points of the two groups of first connecting rods and second connecting rods are connected by an axle body 71, thereby realizing the connection of the two groups of connecting rod assemblies and realizing synchronous movement, which can increase the driving stability and reliability of the secondary wing.

[0071] In order to reduce the installation space, in the present application, a groove 501, 401 is provided at the rear end edge of the main wing 4 and the rear end edge of the secondary wing 5, and the first hinge seat 42 and the second hinge seat 51 are respectively arranged in the two grooves, which can reduce the overall installation thickness and improve the overall compactness and aesthetics.

[0072] See also Figure 2 The two side edges of the backrest bracket 2 extend outward and, at the same time, bend forward in an arc shape to form a protection portion 2a, the edge of the protection portion is arc-shaped, and the connecting rod assembly is located directly in front of the protection portion 2a, thereby protecting the connecting rod assembly and preventing the connecting rod assembly from being damaged by collision, while also achieving shielding and improving the overall aesthetics.

[0073] The self-adjusting backrest of the seat of the present invention adopts movably connected side wings, and is connected to the backrest body through a linkage mechanism. The angle adjustment of the side wings is realized by the pressure of the backrest, so as to realize adaptive adjustment. The seat can be used by infants and young children of different age groups, body shapes and weights, improves the fit and wrapping of the human body, and has good comfort and high safety. The linkage auxiliary side wings are arranged, which can further improve the wrapping and keep the opening and closing degree unchanged, so that the seat is comfortable and safe to use. The gear rack drive is adopted, so that the manufacturing cost is low, the transmission is stable and reliable, and the driving force is large, and the driving effect is good. The inclined guide groove structure is adopted to convert the movement of the backrest into the movement of the rack, so that the structure is compact, the installation volume is small, and the use is stable and reliable. The movably connected backrest bracket and the backrest body are realized by bolts, so that the manufacturing cost is low, the limit position of the backrest body can be quickly adjusted, and the use of different models of seats is satisfied, so that the seat has good versatility. The concave hole structure is arranged, so that the bolt head can be hidden, so that the compactness and aesthetics of the overall structure are improved, and the bolt head is prevented from being exposed and contacting with foreign objects or the human body during movement. The double guide plate structure is set to form a double inclined guide groove, which has good driving stability and high reliability; the rack adopts a plate structure, with a small installation space, a large contact area with the gear, a large driving force, and good driving stability; the rack is a Z-shaped structure, which provides a moving space for the elastic adjustment mechanism, further reducing the overall installation thickness; an adjustable elastic component is set, which can adjust the damping force of the spring on the backrest body according to needs, so as to meet the use of infants and young children of different age groups and weights, with a wide range of applicable scenarios and good use effect; the spring pressing force is adjusted by bolts, with a compact structure, low cost, convenient and labor-saving adjustment, a large adjustment range, and a self-locking function; a groove body is opened on the guide plate to provide a moving space for the pressure plate, further increasing the adjustment range of the elastic force; the self-adjusting backrest of the seat of the present invention has a compact structure, low manufacturing cost, can realize adaptive adjustment of the side wings, good wrapping, comfortable and safe use, and a wide range of application.

[0074] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A self-adjusting seat backrest, characterized in that: include: Backrest bracket 2, serving as a support and mounting carrier; The backrest body 3 is arranged at the front end of the backrest bracket 2 and can move forward and backward. An elastic component is arranged between the backrest bracket 2 and the backrest body 3, and the elastic component makes the backrest body 3 have a tendency to move forward; Main side wings 4, located on both sides of the backrest body 3 and hinged on the backrest bracket 2; The linkage mechanism is arranged between the backrest body 3 and the main side wings 4, and is used to convert the front and rear movement of the backrest body 3 into the front and rear rotation of the main side wings 4 and realize adaptive wrapping.

2. The self-adjustable seat backrest according to claim 1, characterized in that: The linkage mechanism includes a gear 62 rigidly fixed on the rotating shaft 61 of the main side wing 4, two racks 63 slidably fitted on the front end of the backrest bracket 2 and respectively meshing with the two gears 62, and an inclined guide assembly arranged between the rear end of the backrest body 3 and the racks 63. The inclined guide assembly can convert the forward and backward movement of the backrest body 3 into axial sliding of the racks and thereby drive the main side wing 4 to rotate.

3. The self-adjustable seat backrest according to claim 1, characterized in that: The oblique guide assembly includes an oblique guide groove 310 arranged at the rear end of the backrest body 3 and a pin 631 arranged on the side wall of the rack 63 and sleeved in the oblique guide groove 310 . The length direction of the oblique guide groove 310 is inclined to the movement direction of the backrest body 3 .

4. The self-adjustable seat backrest according to claim 1, characterized in that: A guide plate 31 is fixed to the rear end face of the backrest body 3, and the length direction of the guide plate 31 is parallel to the sliding direction of the rack 63. There are two guide plates 31 and they are arranged in parallel. A guide area for accommodating the head of the rack 63 is formed between the two guide plates 31. The pin shaft is fixed to the head of the rack 63 and its end is sleeved in an inclined guide groove 310 opened on the side wall of the guide plate 31.

5. The self-adjustable seat backrest according to claim 1, characterized in that: The rack includes a first plate body 632, the tail of the first plate body 632 is bent backward to form a connecting portion 633, the end of the connecting portion 633 is bent in the opposite direction to form a second plate body 634 parallel to the first plate body 632, the backrest bracket 2 is provided with a slide groove for accommodating the second plate body 634 to be inserted and realize horizontal sliding, the front end surface of the second plate body 634 is provided with teeth 635 to form a rack, and a shaft body is fixed to the head of the first plate body 632, and the two ends of the shaft body form the pin shaft 631.

6. The self-adjustable seat backrest according to claim 1, characterized in that: The edge of the main wing 4 is hinged with a secondary wing 5 , and a connecting rod assembly is provided between the secondary wing 5 and the main wing 4 to form a four-link structure to achieve linkage.

7. The self-adjustable seat backrest according to claim 1, characterized in that: The connecting rod assembly includes a first connecting rod 72 hinged on the rear end edge of the main wing 4 and a second connecting rod 73 hinged on the end of the first connecting rod 72, the end of the second connecting rod 73 is hinged on the rear end edge of the secondary wing, and the rotation axes of the first connecting rod and the second connecting rod are parallel to the rotation axis of the secondary wing 5 and are not coaxial.

8. The self-adjustable seat backrest according to claim 1, characterized in that: The elastic component is a spring component and its elastic force is adjustable.

9. The self-adjustable seat backrest according to claim 1, characterized in that: A pressure plate 83 capable of moving forward and backward is provided at the front end of the backrest bracket 2, and a plurality of springs 82 are provided between the front end surface of the pressure plate 83 and the rear end surface of the backrest body 3. An adjusting bolt 84 is threadedly connected to the rear end of the backrest bracket 2. The end of the adjusting bolt 84 passes through the backrest bracket 2 and contacts with the pressure plate 83, and can push the pressure plate to move forward, thereby adjusting the clamping force of the spring.

10. The self-adjustable seat backrest according to claim 1, characterized in that: The pressing plate 83 includes an upper pressing plate and a lower pressing plate which are arranged in parallel and are respectively located at the upper and lower ends of the inclined guide assembly. The upper pressing plate and the lower pressing plate are connected by a connecting plate to form an "I"-shaped structure. The connecting plate is located between the two racks.

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