A chair back sliding track changing mechanism

Abstract

The present invention discloses a chair back sliding track-changing mechanism, comprising a backrest body, a back support, and a track-changing adjustment component; the track-changing adjustment component comprises a sliding seat and a rotating support, the sliding seat is arranged on the back support and slides up and down along the back support, the backrest body is rotationally connected to the sliding seat, the rotating support is arranged between the back support and the backrest body, and the rotating support is rotationally connected to the back support and the backrest body respectively, when the sliding seat moves downward along the back support, the backrest body rotates backward and the lower end of the backrest body moves forward, and the rotating support rotates synchronously and guides the rotation trajectory of the backrest body. The sliding seat is longitudinally movably set on the back support and is rotationally connected to the backrest body, the back support and the backrest body are connected by the rotating support, and both connections are rotational connections, the connection point on the sliding seat moves downward to drive the backrest body to move downward, and at the same time, the connection point between the backrest body and the rotating support is rotated and moved forward to drive the lower end of the lumbar support body to move forward.

Description

Technical Field

[0001] The present invention relates to the field of seating, and in particular to a chair back sliding track changing mechanism. Background Art

[0002] As an indispensable tool for home and office life, chairs not only have increasingly higher comfort requirements for chairs at home, but even the office environment has significantly improved the comfort and operability of chairs under the premise of work efficiency.

[0003] The backrest of a typical chair is a fixed structure with its lower end connected to the seat or chassis. For some reclining chairs, the backrest can be rotated around the chassis to recline. When the backrest is rotated, the entire backrest falls backwards. This causes the distance between the backrest and the seat to change when reclining. If the seat remains in the same position, the backrest and the user's back will move relative to each other and rub against each other, causing discomfort, thus resulting in what people call the "back rubbing" problem. In addition, the backrest can only be switched between support and reclining states. In the normal support state, the backrest remains fixed, making the user feel stiff when leaning back. However, when the user is actually using the chair, the user's back does not remain unchanged. The front and back position of the back changes accordingly with the sitting posture. The backrest of a conventional chair can only slide longitudinally to adjust the backrest height, but the backrest cannot slide forward and backward, which means that the backrest cannot effectively fit the user's back during actual use. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, the purpose of the present invention is to provide a sliding track changing mechanism for a chair back, by setting up a sliding seat that can slide up and down on the chair back, and the sliding seat is also rotatably connected to the backrest body. At the same time, a rotating support member that is rotatably connected to the chair back and the backrest body is directly provided on the chair back and the backrest body. When the sliding seat slides downward, it can drive the backrest body to rotate backward and move the lower end of the backrest body forward.

[0005] The technical solution of the present invention is achieved as follows:

[0006] A chair back sliding track-changing mechanism includes a backrest body, a back support, and a track-changing adjustment assembly disposed therebetween; the track-changing adjustment assembly includes a sliding seat and a rotating support; the sliding seat is disposed on the back support and slides up and down along the back support; the backrest body is rotationally connected to the sliding seat; the rotating support is disposed between the back support and the backrest body, and the rotating support is rotationally connected to the back support and the backrest body, respectively; when the sliding seat moves downward along the back support, the backrest body rotates backward and the lower end of the backrest body moves forward, and the rotating support rotates synchronously and guides the rotation trajectory of the backrest body. The sliding seat is longitudinally movable on the back support and is rotationally connected to the backrest body; the back support and the backrest body are connected by the rotating support, and both connections are rotationally connected; in this way, the three rotationally connected connection points form a crank slider mechanism; the connection point on the sliding seat moves downward, driving the backrest body downward; and at the same time, the connection point between the backrest body and the rotating support rotates and moves forward, driving the lower end of the lumbar support body forward.

[0007] Preferably, a connecting seat is fixedly provided at the middle section of the rear portion of the backrest body, and the connecting seat is L-shaped overall. The connecting seat includes a main body and an extension extending forward from the lower end of the main body. The two sides of the main body are rotatably connected to the two sides of the sliding seat. The rotating support is located below the sliding seat, with the rear end of the rotating support being rotatably connected to the back bracket, and the two sides of the front end of the extension being rotatably connected to the front end of the rotating support. The backrest body needs to be connected to both the sliding seat and the rotating support. Therefore, an L-shaped connecting seat is provided on the backrest body. In the normal state, the long side of the L-shape, i.e., the main body, fits against the sliding seat, and the upper end is rotatably connected to the two sides of the sliding seat. The extension at the lower end of the L-shape extends forward and is rotatably connected to the front end of the rotating support.

[0008] Preferably, the connecting seat includes a base plate and side panels extending forward and backward from both sides of the base plate. The base plate is fixedly connected to the backrest body, and the extensions are formed by the lower ends of the side panels extending forward. An accommodating space is formed between the base plate and the side panels. When the connecting seat and the sliding seat are engaged, the sliding seat is located within the accommodating space, and the side panels are rotatably connected to the sliding seat. A margin is left between the sliding seat and the base plate to allow the backrest body to rotate. This makes the connecting seat structure as compact as possible, reduces the space occupied front and back, and does not affect the rotation of the backrest body.

[0009] Preferably, a support seat is longitudinally provided on the back bracket, and the support seat includes a support back cover and a support front cover fixedly connected to the back bracket, and a sliding seat is provided on the support front cover and slides up and down relative to it; a sliding rod and a sliding groove are longitudinally provided on the front surface of the support front cover, and the sliding rod is installed in the sliding groove through a connecting block and can slide up and down; when the sliding seat is installed on the support front cover, an opening is provided at a position corresponding to the sliding rod, and the sliding rod is provided with a connecting hole matching the opening, and a screw is screwed in to connect the sliding seat and the sliding rod; the sliding seat and the sliding rod move up and down synchronously to achieve the sliding seat sliding up and down relative to the support seat. The sliding seat needs to slide up and down on the back bracket, so it is necessary to establish a structure that can slide with it. First, a support back cover that can be stably connected to it is established on the back bracket, and then a support front cover that is in sliding contact with the sliding seat is established in front of the support back cover; by longitudinally providing a sliding groove and a sliding rod on the support front cover, and limiting the sliding rod in the sliding groove by a connecting block so that it can only move up and down, and connecting the sliding rod and the sliding seat, the sliding seat can slide up and down on the support front cover more stably.

[0010] Preferably, two connecting blocks are provided longitudinally within each chute. The connecting blocks are provided with an escape opening for the sliding rod to pass through, and screw holes are provided on the surface connected to the supporting front cover. The supporting front cover is provided with a mounting groove for accommodating the connecting blocks, and the mounting groove is provided with through holes matching the screw holes. Screws are inserted to connect the connecting blocks to the supporting front cover. The connecting blocks are fixed within the chute by screws and have through holes in the longitudinal direction for the sliding rod to pass through, allowing the sliding rod to move up and down. Two connecting blocks are provided in each chute, one above the other.

[0011] Preferably, a stopper is provided between the two connecting blocks on the sliding rod. The stopper is prevented from passing through the avoidance opening in the connecting block, so that the movable range of the sliding rod after installation is the distance between the upper and lower connecting blocks. The sliding rod needs to have limited longitudinal movement space, so a stopper is provided between the upper and lower connecting blocks to prevent the movable rod from passing through the avoidance opening.

[0012] Preferably, the limiter is a limit block welded on the sliding rod; or the limiter is formed by flattening the middle portion of the sliding rod, and the width of the limiter is greater than the width of the sliding rod. The shape design and molding method of the limiter are explained.

[0013] Preferably, the supporting front cover is provided with a plurality of connecting protrusions, and the supporting rear cover is provided with connecting sockets matching the connecting protrusions. The supporting front cover and the supporting rear cover are assembled together by means of plug-in connection in which the protrusions match the sockets.

[0014] Preferably, an elastic member is further included, the elastic member being disposed between the sliding seat and the back support, and the elastic member generating a restoring elastic force in response to the sliding of the sliding seat to limit deformation. After the backrest body slides downward, an upward restoring force is required, and thus an elastic corresponding member is required to achieve this purpose.

[0015] Preferably, the elastic member is a spring, and a tension adjustment assembly is provided between the supporting front cover and the sliding seat. The tension adjustment assembly includes a housing, which is mounted on the upper end of the supporting front cover, and a cavity is provided between the housing and the supporting front cover. An adjustment slider is provided in the cavity, and the upper end of the adjustment slider has a spiral opening longitudinally and is connected to a knob with a spiral shaft. The knob is clamped between the housing and the supporting front cover and rotates circumferentially but is fixed axially. The lower end of the spring is connected to the bottom end of the rear surface of the sliding seat, and the upper end of the spring is connected to the adjustment slider. Rotation of the knob drives the adjustment slider up and down, so that the initial length of the spring is adjusted, so that the return elastic force provided by the sliding seat changes. In order to meet the needs of different people for the force required for the sliding of the sliding seat, a tension adjustment assembly with a spring is provided, which can adjust the amount of force required for the sliding seat to move up and down.

[0016] Preferably, a non-slip member is provided between the sliding seat and the back support, and the non-slip member prevents the sliding seat from sliding up and down by longitudinally abutting the sliding seat. Users may not want to use the slide rail function of the backrest, so the limited sliding member can prevent the backrest from sliding up and down.

[0017] Preferably, the support seat and the rotating support member have circular through-holes at their pivoting connection points, and a washer with a geometric through-hole is provided between the two. The washer includes a washer body and a rod protruding axially along the washer. The rod is inserted into and connects the circular through-holes of the support seat and the rotating support member. A geometric rod with a cross-sectional shape matching the geometric through-hole is inserted and connected to the circular through-holes at both ends. One end of the geometric rod is connected to a handle, and the handle is provided with a geometric slot connected to the geometric rod. The geometric rod is provided with an anti-slip member. Rotating the handle drives the geometric rod and the washer but does not affect the rotation of the rotating support member. Therefore, when the rotating support member drives the backrest body to move, it does not affect the rotation of the handle and the anti-slip member on the handle.

[0018] Preferably, the anti-slip member includes a rotating block and a limit handle mounted on the geometric plug rod body, the rotating block and the limit handle being connected by inserting a pin into a matching pin hole; a limit block is provided at a position matching the rotating block on the supporting seat, the rotating block is provided with a first limit surface and a second limit surface and a first protrusion and a second protrusion are set circumferentially, the limit block is provided with matching first locking position and second locking position and a limit groove matching the protrusion; when the first limit surface contacts the first locking position, the first protrusion is stuck in the limit groove, and the anti-slip member does not play an anti-slip role at this time; the user rotates the handle to disengage the first limit surface from the first locking position, and the first protrusion is also disengaged from the limit groove, rotates to the second limit surface to contact the second locking position and make the second protrusion snap into the limit groove, and the lower side of the sliding seat is provided with a handle limit groove, and when the limit block is rotated to the second protrusion snapping into the limit groove, the limit handle presses against the handle limit groove on the sliding seat so that the sliding seat cannot slide down any further. A limit handle and a rotating block that are fixedly connected together are sleeved on the insertion rod, and the state of the limit handle is determined by the cooperation between the rotating block and the limit block; the rotating handle drives the limit handle to rotate against the lower side of the sliding seat to prevent the sliding seat from sliding down further.

[0019] Preferably, the rotating support is provided with a decorative cover along its circumference, which covers the connection between the rotating support, the supporting seat and the backrest body. The rotating support is also used to connect with the back bracket and the backrest body, and covering these connections with the decorative cover makes the whole more beautiful.

[0020] The principles and beneficial effects of the present invention using the above technical solution are:

[0021] The present invention provides a chair back sliding track-changing mechanism, which includes a backrest body and a back support, and a track-changing adjustment component is set up between the two. The track-changing adjustment component includes a sliding seat that can slide up and down on the back support and a rotating support member that is rotatably connected to the backrest body and the back support. When the sliding seat moves downward along the back support, the backrest body rotates backward and the lower end of the backrest body moves forward, and the rotating support member rotates synchronously and guides the rotation trajectory of the backrest body. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a side view of the backrest body in normal state;

[0023] Figure 2 It is a side view of the backrest body when it is tilted backward;

[0024] Figure 3 Exploded diagram of the chair back sliding track changing mechanism①;

[0025] Figure 4 Exploded view of the chair back sliding track changing mechanism②;

[0026] Figure 5It is a structural diagram of the connecting seat;

[0027] Figure 6 Schematic diagram of the installation of the rotating support member;

[0028] Figure 7 It is a schematic diagram of the structure supporting the front cover;

[0029] Figure 8 is a three-dimensional diagram of the connection block;

[0030] Figure 9 A three-dimensional diagram of the supporting back cover;

[0031] Figure 10 A three-dimensional diagram of the supporting front cover;

[0032] Figure 11 This is a three-dimensional diagram of the tension adjustment component ①;

[0033] Figure 12 This is a three-dimensional diagram of the tension adjustment component②;

[0034] Figure 13 An exploded perspective view of the tension adjustment component;

[0035] Figure 14 It is a cross-sectional view of the supporting seat when the backrest body is slidable;

[0036] Figure 15 It is a cross-sectional view of the support seat when the backrest body is locked;

[0037] Figure 16 This is a schematic diagram of the relationship between the limit handle and the sliding seat when the backrest body is locked;

[0038] Figure 17 A three-dimensional diagram of a sliding stop member;

[0039] The reference numerals are: 100 - backrest body, 101 - connecting seat, 102 - main body, 103 - extension part, 104 - base plate, 105 - side plate;

[0040] 200-back bracket, 201-supporting front cover, 202-supporting rear cover, 203-supporting seat, 204-connecting plug-in, 205-connecting socket, 206-sliding rod, 207-slide groove, 208-connecting block, 209-avoidance, 210-through hole, 211-screw hole, 212-limiting block, 213-connecting hole, 214-opening, 300-track adjustment component;

[0041] 301-sliding seat, 302-rotating support, 303-anti-slip groove, 304-decorative cover;

[0042] 400-spring, 401-tension adjustment assembly, 402-housing, 403-cavity, 404-adjustment slider, 405-screw opening, 406-screw shaft, 407-knob, 408-hook, 409-groove, 410-ring;

[0043] 500-anti-slip part, 501-geometric plug-in rod, 502-circular through hole, 503-washer, 504-plug-in rod, 505-handle, 506-rotation block, 507-limiting handle, 508-through groove, 509-limiting block, 510-first limiting surface, 511-first locking surface, 512-first protrusion, 513-limiting groove, 514-second limiting surface, 515-second locking surface, 516-second protrusion, 517-pin hole, 518-geometric through hole. DETAILED DESCRIPTION

[0044] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0045] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0046] The specific implementation of the present invention is as follows:

[0047] like Figure 1-4 As shown, this embodiment provides a chair back sliding track-changing mechanism that allows the chair back to recline while sliding down. The mechanism consists of a backrest body 100, a back bracket 200 and a track-changing adjustment component 300 established between the two. The solution adopted by the present invention is to allow the backrest body 100 to slide down while rotating around a certain point to tilt itself, so the above-mentioned track-changing adjustment component 300 includes a sliding seat 301 that can slide up and down on the back bracket 200 and a rotating support member 302 rotatably connected to the backrest body 100. The rotating support member 302 is established between the back bracket 200 and the backrest body 100, so the rotating support member 302 is rotatably connected to the back bracket 200 and the backrest body 100 at the same time. In this way, when the sliding seat 301 slides downward along the back bracket 100, the backrest body 100 rotates backward and the lower end of the backrest body 100 follows the rotation of the rotating support member 302 to move the lower end of its own body forward.

[0048] The above introduces the general composition of the chair back sliding track changing mechanism. Next, we will give a detailed introduction to each part:

[0049] Specifically, the backrest body 100 is connected to the sliding seat 301 and the rotating support member 302 at the same time, so a connecting seat 101 for connecting with the above two is fixedly connected to the middle of the rear end of the backrest body 100. Figure 4 As shown, the connecting seat 101 is L-shaped as a whole, and the vertical side of the L-shaped connecting seat 101 is the main body 102, and the lower end of the main body 102 extends forward to form an extension portion 103; the two sides of the upper end of the main body 102 are rotatably connected to the two sides of the sliding seat 301, and the extension portion 103 at the lower end is rotatably connected to the two sides of the front end of the rotating support member 302; Figure 4 It can be seen that the rotating support member 302 is located below the sliding seat and the two sides of the rear end are rotatably connected to the two sides of the back bracket 200.

[0050] The structure of the connection base 101 is described in more detail below. Figure 5 As shown, the connecting seat 101 includes a base plate 104 attached to the backrest body 100, and side panels 105 are extended on both sides of the base plate 104. The base plate 104 and the side panels 105 together constitute the above-mentioned main body 102, and the above-mentioned extension portion 103 is formed by the forward extension of the lower end of the side panel 105; the base plate 104 and the side panels 105 surround and form an accommodating space, and the sliding seat 301 is connected in the accommodating space and is rotatably connected to the side panels 105 on both sides by rotating pins. Since the sliding seat 301 can only slide up and down on the back bracket 200 and the backrest body 100 needs to rotate, the front surface of the sliding seat 301 and the base plate 104 are not in direct surface contact, but a margin space is left between the two for the rotation of the backrest body 100.

[0051] like Figure 3 、 Figure 4 As shown, considering the sliding fit between the back support 200 and the sliding seat 301, a supporting seat 203 including a supporting front cover 201 and a supporting rear cover 202 is provided in the longitudinal direction of the back support 200, wherein the supporting rear cover 202 is fixedly connected to the back support 200, the supporting front cover 201 is connected to the side of the supporting rear cover 202 facing the backrest body 100 and the sliding seat 301 is installed on the supporting front cover 201; the connection method of the supporting front cover 201 and the supporting rear cover 202 is as follows Figure 9 、 Figure 10 As shown, first, a number of connecting plugs 204 are set up on the surface where the supporting front cover 201 contacts the supporting back cover, and then connecting sockets 205 matching the number of connecting plugs 204 are set up on the surface of the supporting back cover 202. The supporting front cover 201 and the supporting back cover 202 are assembled together by plugging and then fixed with screws.

[0052] The sliding seat 301 is disposed on the supporting front cover 201 and slides up and down relatively, so it is necessary to set up a component that can support the sliding function, such as Figure 7 、 Figure 8 As shown, a slide groove 207 is longitudinally provided on the front surface of the supporting front cover 201, and a sliding rod 206 is movably provided in the slide groove 207. In order to ensure that the sliding rod 206 can slide along a predetermined track in the slide groove 207, a connecting block 208 for installing the sliding rod 206 is provided in the slide groove 207. First, the two ends of the sliding rod 206 must pass through the connecting block 208. Therefore, an avoidance opening 209 for the sliding rod 206 to pass through is opened on the connecting block 208 so that the sliding rod 206 can pass through the connecting block 208 at both ends and can move axially along the connecting block; the connecting block 208 needs to be fixedly installed in the slide groove 20 7, this embodiment uses screws to connect the two, a screw hole 210 is opened on the side of the connecting block 208 that is in contact with the slide groove 207, and a through hole 211 matching the through hole is opened in the slide groove 207 where the connecting block 208 is pre-installed. In this way, when the sliding rod 206 is inserted into the connecting block 208, the position of the connecting block 208 is adjusted to align the screw hole 210 with the through hole 211, and then the connecting block 208 can be fixed in the slide groove 207 with screws, and then the sliding rod 206 is connected to the sliding seat 301 so that the sliding seat 301 can slide as the sliding rod 206 slides up and down.

[0053] Regarding the connection between the sliding rod 206 and the sliding seat 301, after the sliding rod 206 is installed in the sliding groove 207, it is first necessary to limit the sliding range of the sliding rod 206 in the sliding groove 207. If the sliding rod 206 is a whole smooth round rod, it will be difficult to limit it in the longitudinal direction. Figure 7 As shown, a limiting member 212 needs to be set up at the part of the two connecting blocks 208 of the sliding rod 206. The limiting member 212 can be a limiting block welded on the sliding rod, or it can be formed by flattening the middle part of the sliding rod 206. The width of the limiting member 212 is greater than the diameter of the sliding rod 206, so it cannot pass through the avoidance opening 209, so that the movable range of the sliding rod 206 in the longitudinal direction is restricted; a connecting hole 213 is opened on the limiting member 212, and an opening 214 is opened at a corresponding position on the sliding seat 301, and the connecting hole 213 and the opening 214 are connected by screws, so that the sliding seat 301 and the sliding rod 206 are relatively fixed and slide synchronously, thereby realizing the up and down sliding of the sliding seat 301 relative to the supporting seat 203.

[0054] Due to the effect of gravity, the sliding seat 301 will slide downward by default, so it is necessary to set up a component to pull the sliding seat 301 upward to keep it in the reset state. In this embodiment, an elastic member, namely a spring 400, is set up. The spring 400 is located between the sliding seat 301 and the supporting front cover 201, and the spring 400 responds to the sliding of the sliding seat 301 to limit deformation and generate a reset elastic force. The position of the spring 400 is as shown in FIG. Figure 7 、 Figure 16 shown.

[0055] Regarding the installation of the spring 400, its two ends can be connected to the sliding seat 301 and the supporting front cover 201 respectively. However, considering that different people have different weights, the forces applied to the backrest are also different. Therefore, considering the applicability of different groups of people, so that people of different weights can find the force that suits them, a tension adjustment component 401 is provided, which not only allows the spring 400 to generate the return elastic force of the sliding seat 301, but also can adjust the magnitude of the force required for the sliding seat 301 to slide to match the needs of different users; the installation diagram of the tension adjustment component 401 is shown in FIG. Figure 11-13 As shown, first, a shell 402 is installed at the upper end of the supporting front cover 201, and a cavity 403 for installing an adjusting slider 404 is opened between the shell 402 and the supporting front cover 201. The adjusting slider 404 needs to move up and down to pull the spring, so a spiral opening 405 is opened in the longitudinal direction of the adjusting slider 404, and a knob 407 with a spiral rod 406 is inserted downward from the upper side of the cavity 403 to connect with the adjusting slider 404. For the knob 407, this embodiment first provides a circular groove 409 at the upper end of the cavity 403, and sets a circular ring member 410 matching the circular groove 409 on the rod of the knob 407. The ring 410 is inserted into the circular groove 409 and covers the shell 402, so that the knob 407 and the supporting front cover 201 will not have any relative movement in the longitudinal direction, but the knob 407 can rotate relative to the spiral opening 405 in the adjusting slider 404 and drive the adjusting slider 404 to slide longitudinally on the supporting front cover 201; one end of the spring 400 is connected to the lower side of the adjusting slider 404, and the other end is connected to the hook 408 on the lower side of the sliding seat 301. When the user lies back, the sliding seat 301 slides downward to stretch the spring 400 to generate an upward reset elastic force. After the user sits up, the sliding seat 301 is acted upon by the elastic force and rebounds to its original position.

[0056] However, the user of the chair will want to use the reclining position of the backrest body 100 at all times, so a component with a non-slip function of the sliding seat 301 can be provided; Figure 14-17 As shown, a support structure is established between the front cover 201 and the sliding seat 301. Figure 17 The anti-slip member 500 shown is installed at the bottom end of the supporting front cover 201 and the sliding seat 301.

[0057] Before installing the anti-slip member 500, the connection method between the supporting front cover 201 and the bottom end of the sliding seat 301 must be improved; Figure 16As shown, there is a geometric insertion rod 501 that passes through the left and right ends of the supporting front cover 201. The geometric insertion rod 501 also serves to connect the supporting front cover 201 and the rotating support 302. The holes on the rotating support 302 and the supporting front cover 201 for the geometric insertion rod 501 to pass through are both circular through holes 502, which prevents the geometric insertion rod 501 and the rotating support 302 from being rotated due to the rotation of one of them; in order to allow the geometric insertion rod 501 to be stably connected to the circular through hole 502, a washer 503 with a geometric through hole 518 is provided at the connection between the two, and the washer 503 also has an insertion rod 504 axially protruding from it that matches the circular through hole 502, so that the washer 503 can simultaneously connect to the supporting front cover 201 and the circular through hole 502 on the rotating support 302.

[0058] The above describes the installation method of the geometric rod 501. The following further explains the structure and installation of the anti-slip member 500 on the geometric rod 501. Figure 16 、 17 As shown, a handle 505 for the user is provided on one end of the geometric rod 501, and the geometric rod 501 is inserted into the place supporting the interior of the front cover as shown. Figure 17 The rotating block 506 and the limiting handle 507 shown in the figure are circumferentially fixedly installed on the geometric insertion rod 501 by setting a through groove 508 with the same cross-section as the geometric insertion rod 501, while the limiting handle 507 is relatively fixedly connected by setting a pin hole 517 at a matching position with the rotating block 506 through a pin. The user can drive the limiting handle 507 to rotate by rotating the handle 505; the limiting handle 507 needs to stop rotating after rotating to the corresponding position; the rotating block 506 needs to be able to stop after rotating to the corresponding position so that the anti-slip member 500 can stably play an anti-slip role, so as Figure 14 、 15 As shown, a limit block 509 is provided next to the rotating block 506, and the limit block 509 is fixedly provided on the supporting seat 203; the rotating block 506 rotates axially and forms two gears of storage and expansion through the cooperation of its different circumferential positions and the shape of the limit block 509. The gear position of the rotating block 506 determines whether the sliding seat 301 can slide up and down; Figure 2 、 14When the user applies a certain rotational force to the handle 505, the first protrusion 512 breaks away from the limit groove 513 and rotates until the second protrusion 516 is stuck in the limit groove 513, the second limit surface 514 on the rotating block 506 is counteracted with the second locking position 515 on the limit block 509, and the rotating block 506 drives the limit handle 507 to be in the expanded state. Figure 16 As shown, at this time, the upper end of the limiting handle 507 abuts against the anti-slip groove 303 at the lower end of the sliding seat 301, and the sliding seat 301 cannot slide downward any further.

[0059] The connection method of the rotating support member 302 and the backrest body 100 uses the same geometric insertion rod 501 and washer 503 as described above. Since the rotating support member 302 is connected to the supporting front cover 201 and the backrest body 100 at the same time, multiple connections are likely to make the appearance unsightly. Therefore, in this embodiment, Figure 6 、 Figure 16 As shown, a decorative cover 304 is provided wrapped around the rotating support 302. The decorative cover 304 can simultaneously cover the exposed column heads at both ends of the geometric insertion rod 501 and further enhance the structural stability of the rotating support.

[0060] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs a structure and embodiment similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A chair back sliding track changing mechanism, characterized by: The utility model comprises a backrest body, a back support and a track-changing adjustment component arranged therebetween; the track-changing adjustment component comprises a sliding seat and a rotating support member, the sliding seat is arranged on the back support and slides up and down along the back support, the backrest body is rotatably connected to the sliding seat, the rotating support member is arranged between the back support and the backrest body, and the rotating support member is rotatably connected to the back support and the backrest body respectively, when the sliding seat moves downward along the back support, the backrest body rotates backward and the lower end of the backrest body moves forward, and the rotating support member rotates synchronously and guides the rotation trajectory of the backrest body; the utility model also comprises an elastic member, the elastic member is arranged between the sliding seat and the back support, and the elastic member generates a restoring elastic force in response to the sliding of the sliding seat to limit deformation; The anti-slip part is also included, and the anti-slip part is set between the sliding seat and the back bracket. The anti-slip part includes a rotating block and a limit handle installed on the geometric plug rod body, and the rotating block and the limit handle are connected by inserting a pin into a matching pin hole; a limit block is provided at a position matching the rotating block on the supporting seat, and the rotating block is provided with a first limiting surface and a second limiting surface and a first protrusion and a second protrusion are set along the circumferential direction, and the limit block is provided with a matching first locking position and a second locking position and a matching protrusion. When the first limit surface contacts the first locking position, the first protrusion is stuck in the limit groove, and the anti-slip part does not play an anti-slip role at this time; the user rotates the handle to disengage the first limit surface from the first locking position, and the first protrusion is also disengaged from the limit groove, and rotates until the second limit surface contacts the second locking position and the second protrusion is stuck in the limit groove. A handle limit groove is provided on the lower side of the sliding seat. When the limit card block is rotated until the second protrusion is stuck in the limit groove, the limit handle presses against the handle limit groove on the sliding seat to prevent the sliding seat from sliding down further.

2. The seat back sliding track changing mechanism according to claim 1, characterized in that: A connecting seat is fixedly provided on the middle section of the rear of the backrest body, and the connecting seat is L-shaped as a whole; the connecting seat includes a main body and an extension portion extending forward from the lower end of the main body; both sides of the main body are rotatably connected to both sides of the sliding seat; the rotating support is located below the sliding seat, the rear end of the rotating support is rotatably connected to the back bracket, and the two sides of the front end of the extension are rotatably connected to the front end of the rotating support.

3. The seat back sliding track changing mechanism according to claim 2, characterized in that: The connecting seat includes a base plate and side panels extending forward and backward from both sides of the base plate. The base plate is fixedly connected to the backrest body, and the extension portion is formed by extending forward from the lower end of the side panel. An accommodating space is formed between the base plate and the side panel. When the connecting seat cooperates with the sliding seat, the sliding seat is in the accommodating space, and the side panel is rotatably connected to the sliding seat. A margin is left between the sliding seat and the base plate for the backrest body to rotate.

4. The seat back sliding track changing mechanism according to claim 1, characterized in that: A supporting seat is longitudinally provided on the back bracket, and the supporting seat includes a supporting rear cover and a supporting front cover fixedly connected to the back bracket, and the sliding seat is provided on the supporting front cover and slides up and down relatively; a sliding rod and a sliding groove are longitudinally provided on the front surface of the supporting front cover, and the sliding rod is installed in the sliding groove through a connecting block and can slide up and down; when the sliding seat is installed on the supporting front cover, an opening is provided at a position corresponding to the sliding rod, and a connecting hole matching the opening is provided on the sliding rod, and a screw is screwed in to connect the sliding seat and the sliding rod; the sliding seat and the sliding rod move up and down synchronously to realize the sliding up and down movement of the sliding seat relative to the supporting seat.

5. The seat back sliding track changing mechanism according to claim 4, characterized in that: There are two connecting blocks in each slide groove in the longitudinal direction. The connecting block is provided with an avoidance opening for the sliding rod to pass through, and a screw hole is provided on the surface connected to the supporting front cover. The supporting front cover is provided with a mounting groove for placing the connecting block, and a through hole matching the screw hole is opened on the mounting groove. The screws are screwed in to connect the connecting block to the supporting front cover.

6. The chair back sliding track changing mechanism according to claim 4, characterized in that: A limit piece is provided between the two connecting blocks on the sliding rod, and the limit piece is restricted from passing through the avoidance opening on the connecting block, so that the movable range of the sliding rod after installation is the distance between the upper and lower connecting blocks.

7. The seat back sliding track changing mechanism according to claim 6, characterized in that: The limiting member is a limiting block welded on the sliding rod; or the limiting member is formed by flattening the middle part of the sliding rod, and the width of the limiting member is greater than the width of the sliding rod.

8. The chair back sliding track changing mechanism according to claim 4, characterized in that: The supporting front cover is provided with a plurality of connecting protrusions, and the supporting rear cover is provided with connecting sockets matching the connecting protrusions.

9. The chair back sliding track changing mechanism according to claim 4, characterized in that: The elastic member is a spring, and a tension adjustment component is provided between the supporting front cover and the sliding seat. The tension adjustment component includes a shell, which is installed on the upper end of the supporting front cover, and a cavity is provided between the shell and the supporting front cover, and an adjustment slider is provided in the cavity. The upper end of the adjustment slider has a spiral opening in the longitudinal direction and is connected to a knob with a spiral rod body. The knob is clamped between the shell and the supporting front cover and the knob rotates circumferentially and is fixed axially. The lower end of the spring is connected to the bottom end of the rear surface of the sliding seat, and the upper end of the spring is connected to the adjustment slider. The rotation of the knob drives the adjustment slider to move up and down, so that the initial length of the spring is adjusted, so that the reset elastic force provided when the sliding seat slides changes.

10. The chair back sliding track changing mechanism according to claim 1, characterized in that: The rotating connection between the supporting seat and the rotating support member are both circular through holes, and a gasket with a geometric through hole is set between the two. The gasket includes a gasket body and an insertion rod protruding along the axial direction of the gasket. The insertion rod is inserted into the circular through holes of the supporting seat and the rotating support member and connects the two. A geometric insertion rod with a cross-sectional shape matching the geometric through hole is inserted to connect the circular through holes at both ends; one end of the geometric insertion rod is connected to a handle, and the handle is provided with a geometric slot connected to the geometric insertion rod, and an anti-slip part is provided on the rod body of the geometric insertion rod.

11. The chair back sliding track changing mechanism according to claim 10, characterized in that: The rotating support member is provided with a decorative cover along its circumference, and the decorative cover wraps the connection between the rotating support member, the supporting seat and the backrest body.

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