CN117297283A - Chair back sliding rail-changing mechanism - Google Patents

Abstract

The invention discloses a chair back sliding rail-changing mechanism, which comprises a chair back main body, a back bracket and a rail-changing adjusting assembly; the track change adjusting assembly comprises a sliding seat and a rotating support piece, wherein the sliding seat is arranged on the back support and vertically slides along the back support, the back main body is rotationally connected with the sliding seat, the rotating support piece is arranged between the back support and the back main body, the rotating support piece is rotationally connected with the back support and the back main body respectively, when the sliding seat moves downwards along the back support, the back main body rotates backwards and the lower end of the back main body moves forwards, and the rotating support piece synchronously rotates and guides the rotating track of the back main body. The sliding seat is longitudinally movably arranged on the back support and the back support body is rotationally connected, the back support and the back support body are connected through the rotating support piece, the two parts are rotationally connected, the connecting point on the sliding seat moves downwards to drive the back support body to move downwards, and meanwhile, the connecting point of the back support body and the rotating support piece is rotated and moved forwards to drive the lower end of the lumbar support body to move forwards.

Description

Chair back sliding rail-changing mechanism

Technical Field

The invention relates to the field of seats, in particular to a chair back sliding rail-changing mechanism.

Background

As a living tool which is indispensable for the living and working environment, the chair has higher and higher comfort requirements for the living and working environment, and has obvious requirements for improving the comfort and operability of the chair on the premise of working efficiency.

The chair back of the current general chair is of a structure with fixed integral form, and the lower end of the chair back is connected to the seat of the chair or the chassis; for some reclining chairs, the chair back can rotate backwards around the chassis, and when the chair back rotates backwards, the chair back falls backwards; the back of the chair can be moved relative to the back of the user under the condition of unchanged seat position, so that discomfort is caused; so that the back rubbing problem of people appears. In addition, the chair back can only be switched between a supporting state and a backward tilting state, and in a normal supporting state, the chair back is kept in a fixed state, so that a user feels hard when leaning back on the chair back; when a user actually uses the seat, the back of the user is not kept unchanged, and the front and back positions of the back can be correspondingly changed along with the change of the sitting posture; the chair back of the conventional chair can only longitudinally slide to adjust the height of the chair back at most, but the front and back positions of the chair back are not sliding, so that the chair back can not be effectively attached to the back of a user in the actual use process of the chair back.

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide a sliding rail-changing mechanism for a chair back, wherein a sliding seat capable of sliding up and down is arranged on the chair back and is also rotationally connected with a backrest main body, meanwhile, a rotating supporting piece which is rotationally connected with the chair back and the backrest main body is directly arranged on the chair back and the backrest main body, and when the sliding seat slides downwards, the backrest main body can be driven to rotate backwards and the lower end of the backrest main body can be driven to move forwards.

The technical scheme of the invention is realized as follows:

a sliding track-changing mechanism of a chair back comprises a chair back main body, a back bracket and a track-changing adjusting component arranged between the back main body and the back bracket; the track change adjusting assembly comprises a sliding seat and a rotating support piece, wherein the sliding seat is arranged on the back support and vertically slides along the back support, the back main body is rotationally connected with the sliding seat, the rotating support piece is arranged between the back support and the back main body, the rotating support piece is rotationally connected with the back support and the back main body respectively, when the sliding seat moves downwards along the back support, the back main body rotates backwards and the lower end of the back main body moves forwards, and the rotating support piece synchronously rotates and guides the rotating track of the back main body. The sliding seat is longitudinally movably arranged on the back support and the back support body is rotationally connected, the back support and the back support body are connected through the rotating support piece, and the two parts are rotationally connected, so that three rotationally connected connection points form a crank sliding block mechanism, the connection point on the sliding seat moves downwards to drive the back support body to move downwards, and meanwhile, the connection point of the back support body and the rotating support piece is rotated and moved forwards to drive the lower end of the lumbar support body to move forwards.

Preferably, a connecting seat is fixedly arranged in the middle section of the rear part of the backrest main body, and the whole connecting seat is L-shaped; the connecting seat comprises a main body part and an extending part extending forwards at the lower end of the main body part; two sides of the main body part are rotationally connected with two sides of the sliding seat; the rotating support piece is arranged below the sliding seat, the rear end of the rotating support piece is rotationally connected with the back support, and two sides of the front end of the extending part are rotationally connected with the front end of the rotating support piece. The backrest main body needs to be connected with the sliding seat and the rotating supporting piece at the same time, so that an L-shaped connecting seat is arranged on the backrest main body, the long side of the L-shaped connecting seat is attached to the sliding seat in a normal state, the upper end of the L-shaped connecting seat is rotationally connected with the two sides of the sliding seat, and the extending part of the lower end of the L-shaped connecting seat extends forwards and is rotationally connected with the front end of the rotating supporting piece.

Preferably, the connecting seat comprises a base plate and side plates extending from the front to the back of the two sides of the base plate, the base plate is fixedly connected with the backrest main body, the extending part is formed by extending the lower ends of the side plates forwards, a containing space is formed between the base plate and the side plates, when the connecting seat is matched with the sliding seat, the sliding seat is positioned in the containing space, the side plates are rotationally connected with the sliding seat, and a allowance space for the backrest main body to rotate is reserved between the sliding seat and the base plate. The connecting seat structure is as compact as possible, the space occupied by the connecting seat is reduced, and the rotation of the backrest main body is not influenced.

Preferably, the back support is longitudinally provided with a bearing seat, the bearing seat comprises a bearing back cover and a bearing front cover which are fixedly connected to the back support, and the sliding seat is arranged on the bearing front cover and slides up and down relatively; the front surface of the bearing front cover is longitudinally provided with a sliding rod and a sliding groove, and the sliding rod is arranged in the sliding groove through a connecting block and can slide up and down; the sliding seat is provided with an opening at a position corresponding to the sliding rod when being arranged on the bearing front cover, the sliding rod is provided with a connecting hole matched with the opening, and a screw is screwed in to connect the sliding seat and the sliding rod; the sliding seat and the sliding rod synchronously move up and down to realize the up and down sliding of the sliding seat relative to the bearing seat. The sliding seat needs to slide up and down on the back support, so that a structure capable of being matched with the sliding seat in a sliding way is needed to be established, a bearing back cover capable of being stably connected to the back support is firstly established on the back support, and then a bearing front cover in sliding contact with the sliding seat is established in front of the bearing back cover; through longitudinally setting up spout and slide bar on the bearing protecgulum to limit the slide bar through the connecting block and can only reciprocate in the spout, and connect slide bar and sliding seat, make the sliding seat can more stable slide from top to bottom at the bearing protecgulum.

Preferably, two connecting blocks are longitudinally arranged in each sliding groove, avoiding openings for the sliding rods to pass through are formed in the connecting blocks, screw holes are formed in the surfaces connected with the supporting front covers, mounting grooves for placing the connecting blocks are formed in the supporting front covers, through holes matched with the screw holes are formed in the mounting grooves, and the connecting blocks are connected to the supporting front covers by screwing screws. The connecting blocks are fixed in the sliding grooves through screws, through holes for the sliding rods to pass through are formed in the longitudinal direction of the connecting blocks for the sliding rods to move up and down, and two connecting blocks are arranged in each sliding groove up and down.

Preferably, a limiting part is arranged at the middle position of the two connecting blocks on the sliding rod, and the limiting part is limited to be unable to penetrate through the avoidance port on the connecting block, so that the movable section is the distance between the upper connecting block and the lower connecting block after the sliding rod is installed. The sliding rod needs to be limited by a longitudinal movable space, so that a limiting piece which cannot pass through the avoidance port is arranged at the position between the upper connecting block and the lower connecting block of the movable rod.

Preferably, the limiting piece is a limiting piece welded on the sliding rod; or the limiting piece is formed by flattening the middle part of the sliding rod, and the width of the limiting piece is larger than that of the sliding rod. The form design and how the limiting piece is formed are explained.

Preferably, the supporting front cover is provided with a plurality of connecting bulges, and the supporting rear cover is provided with a connecting socket matched with the connecting bulges. The bearing front cover and the bearing back cover are assembled together in a plug connection mode of the bulge and the socket.

Preferably, the sliding seat is provided with a sliding seat, and the sliding seat is provided with a back support. An upward restoring force is required after the backrest body slides downward, and thus an elastic counterpart is required to achieve the object.

Preferably, the elastic component is the spring, be equipped with elasticity regulation subassembly between bearing protecgulum and the sliding seat, elasticity regulation subassembly includes the shell, and the shell is installed in bearing protecgulum upper end, and is equipped with the cavity between shell and the bearing protecgulum, be equipped with the regulation slider in the cavity, it has the spiral opening and is connected with the knob of taking the spiral pole body to adjust the slider upper end along vertically opening, the knob presss from both sides between shell and bearing protecgulum and knob circumferential direction, axial fixity, the spring lower extreme is connected with sliding seat rear surface bottom, the regulation slider is connected to the spring upper end, the knob rotates and drives the regulation slider and reciprocate for the initial length of spring is adjusted, the reset elasticity that provides when making the sliding seat slide produces and changes. The adjusting elastic assembly with the spring is arranged to meet the force requirement of different people for sliding the sliding seat, and the force required by the sliding seat to move up and down can be adjusted.

Preferably, a slide stop is included, which is arranged between the slide seat and the back support, the slide stop being made to be unable to slide up and down by abutting the slide seat in the longitudinal direction. The user may sometimes not be directed to the slide rail function of the backrest, so a limited slide is established so that the backrest cannot slide up and down.

Preferably, the rotary connection part of the bearing seat and the rotary support piece is a circular through hole, a gasket with a geometric through hole is arranged between the bearing seat and the rotary support piece, the gasket comprises a gasket body and an inserting rod protruding along the axial direction of the gasket, the inserting rod is inserted into the circular through hole of the bearing seat and the rotary support piece and is connected with the circular through hole, and the geometric inserting rod with the cross section matched with the geometric through hole is inserted into the circular through holes at the two ends; the end head of one end of the geometric shaped inserted link is connected with a handle, the handle is provided with a geometric shaped slot which is connected with the geometric shaped inserted link, and the rod body of the geometric shaped inserted link is provided with a non-slip piece. The geometric inserted bar and the gasket are driven to rotate when the handle is rotated, but the rotation of the rotating supporting piece is not influenced, so that the rotating supporting piece can not influence the rotation of the handle and the non-slip piece on the handle when the backrest main body is driven to move.

Preferably, the anti-slip piece comprises a rotary clamping block and a limiting handle which are arranged on the geometric rod body of the inserted rod, and the rotary clamping block is inserted into the inserted pin through a matched inserted pin hole; the bearing bracket is provided with a limiting clamping block at a position matched with the rotating clamping block, the rotating clamping block is provided with a first limiting surface and a second limiting surface, a first bulge and a second bulge are arranged along the circumferential direction, the limiting clamping block is provided with a first locking position and a second locking position which are matched with each other, and a limiting groove matched with the bulge is arranged on the limiting clamping block; when the first limiting surface is contacted with the first locking position, the first bulge is clamped in the limiting groove, and the anti-slip piece does not play a role in anti-slip at the moment; the user rotates the handle and breaks away from first spacing face from first locking position, and simultaneously first arch also breaks away from the spacing groove, rotates to second spacing face and second locking position contact and make the protruding card of second go into spacing inslot, and the sliding seat downside is equipped with the spacing groove of handle, and when spacing fixture block rotated to the protruding card of second go into spacing inslot, spacing handle supported the spacing groove of handle on the sliding seat and made the sliding seat can not slide down any more. A limiting handle and a rotating clamping block which are fixedly connected are sleeved on the inserted link, and the state of the limiting handle is determined through the matching relation between the rotating clamping block and the limiting clamping block; the rotating handle drives the limiting handle to rotate against the lower side of the sliding seat, so that the sliding seat can not slide downwards any more.

Preferably, the rotary support is provided with a decorative cover along the whole body, and the decorative cover wraps the joint of the rotary support, the bearing bracket and the backrest main body. The rotary supporting piece is used for being connected with the back support and the backrest main body, and the connecting parts are covered by the decorative cover, so that the whole is more attractive.

The principle and beneficial effects of the invention adopting the technical scheme are as follows:

the invention provides a chair back sliding rail-changing mechanism, which comprises a backrest main body and a backrest bracket, wherein a rail-changing adjusting assembly is arranged between the backrest main body and the backrest bracket, the rail-changing adjusting assembly comprises a sliding seat capable of sliding up and down on the backrest bracket and a rotating support piece which is simultaneously connected with the backrest main body and the backrest bracket in a rotating way, when the sliding seat moves downwards along the backrest bracket, the backrest main body rotates backwards, the lower end of the backrest main body moves forwards, and the rotating support piece synchronously rotates and guides the rotating track of the backrest main body.

Drawings

FIG. 1 is a side view of the back body in a normal state;

FIG. 2 is a side view of the back body with the back reclined;

FIG. 3 is an exploded view (1) of the chair back sliding track change mechanism;

FIG. 4 is an exploded view (2) of the chair back sliding track change mechanism;

FIG. 5 is a schematic view of a structure of a connecting base;

FIG. 6 is a schematic view of the installation of a rotating support;

FIG. 7 is a schematic view of the structure of the support front cover;

FIG. 8 is a perspective view of a connection block;

FIG. 9 is a perspective view of the back support cover;

FIG. 10 is a perspective view of the bearing front cover;

FIG. 11 is a perspective view (1) of the slack adjuster assembly;

FIG. 12 is a perspective view (2) of the slack adjuster assembly;

FIG. 13 is an exploded perspective view of the slack adjuster assembly;

FIG. 14 is a cross-sectional view of the socket when the back body is slidable;

FIG. 15 is a cross-sectional view of the socket when the back body is locked;

FIG. 16 is a schematic view showing the relationship between the limit handle and the sliding seat when the backrest body is locked;

FIG. 17 is a perspective view of the shuttle;

the reference numerals are as follows: 100-a backrest main body, 101-a connecting seat, 102-a main body part, 103-an extension part, 104-a base plate and 105-a side plate;

200-back support, 201-bearing front cover, 202-bearing back cover, 203-bearing seat, 204-connecting plug, 205-connecting socket, 206-sliding rod, 207-chute, 208-connecting block, 209-avoidance port, 210-through hole, 211-screw hole, 212-limited block, 213-connecting hole, 214-opening and 300-track change adjusting component;

301-sliding seat, 302-rotating supporting piece, 303-sliding stopping groove and 304-decorative cover;

400-springs, 401-tightness adjusting components, 402-shells, 403-cavities, 404-adjusting sliding blocks, 405-spiral openings, 406-spiral rod bodies, 407-knobs, 408-hooks, 409-circular grooves and 410-circular rings;

500-non-slip piece, 501-geometric insert rod, 502-round through hole, 503-gasket, 504-insert rod, 505-handle, 506-rotating clamping block, 507-limit handle, 508-through groove, 509-limit clamping block, 510-first limit surface, 511-first locking surface, 512-first protrusion, 513-limit groove, 514-second limit surface, 515-second locking surface, 516-second protrusion, 517-insert pin hole, 518-geometric through hole.

Description of the embodiments

In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.

The specific embodiments of the present invention are as follows:

as shown in fig. 1 to 4, the present embodiment provides a chair back sliding track change mechanism which allows the chair back to recline while sliding down, the mechanism being composed of a back main body 100, a back bracket 200, and a track change adjusting assembly 300 interposed therebetween; the present invention adopts a scheme that the backrest main body 100 is slid down and rotated around a certain point to incline itself by sliding and rotating, so that the track-changing adjusting assembly 300 includes a sliding seat 301 which can slide up and down on the backrest bracket 200 and a rotating support member 302 which is rotatably connected with the backrest main body 100, the rotating support member 302 is established between the backrest bracket 200 and the backrest main body 100, and thus the rotating support member 302 is simultaneously rotatably connected with the backrest bracket 200 and the backrest main body 100, so that when the sliding seat 301 slides down along the backrest bracket 100, the backrest main body 100 rotates backward and the lower end of the backrest main body 100 moves forward along with the rotation of the rotating support member 302.

The general composition of the chair back sliding rail-changing mechanism is introduced above, and the following specific description is made for each part:

specifically, the backrest main body 100 is connected to the sliding seat 301 and the rotating support 302 at the same time, so that a connecting seat 101 for connecting the sliding seat 301 and the rotating support 302 is fixedly connected to the middle part of the rear end of the backrest main body 100, as shown in fig. 4, the connecting seat 101 is integrally L-shaped, the vertical side edge of the L-shaped connecting seat 101 is a main body 102, and the lower end of the main body 102 extends forward to form an extension 103; the two sides of the upper end of the main body 102 are rotationally connected with the two sides of the sliding seat 301, and the extension part 103 at the lower end is rotationally connected with the two sides of the front end of the rotary supporting piece 302; as can be seen from fig. 4, the rotating support 302 is located below the sliding seat and two sides of the rear end are rotatably connected to two sides of the back bracket 200.

As shown in fig. 5, the connecting seat 101 includes a base plate 104 attached to the backrest main body 100, and side plates 105 extending from both sides of the base plate 104, wherein the base plate 104 and the side plates 105 together form the main body 102, and the extending portion 103 extends forward from the lower end of the side plates 105; the base plate 104 and the side plates 105 enclose a receiving space, and the slide base 301 is connected in the receiving space and is rotatably connected with the side plates 105 at both sides by a rotation pin, and since the slide base 301 can only slide up and down on the back bracket 200 and the back main body 100 needs to be rotated, a margin space for the rotation of the back main body 100 is left between the front surface of the slide base 301 and the base plate 104 instead of being directly contacted from surface to surface.

As shown in fig. 3 and 4, considering the sliding fit of the back support 200 and the sliding seat 301, a support seat 203 including a support front cover 201 and a support rear cover 202 is provided on the back support 200 in the longitudinal direction, wherein the support rear cover 202 is fixedly connected to the back support 200, the support front cover 201 is connected to the side of the support rear cover 202 facing the backrest main body 100, and the sliding seat 301 is mounted on the support front cover 201; as shown in fig. 9 and 10, the connection mode of the front bearing cover 201 and the rear bearing cover 202 is that a plurality of connection plug-ins 204 are firstly arranged on the surface of the front bearing cover 201, which is contacted with the rear bearing cover, and then the surface of the rear bearing cover 202 is provided with a plurality of connection plug-ins 204 which are matched with connection sockets 205, the front bearing cover 201 and the rear bearing cover 202 are assembled together in a plugging mode, and are fixed by screws.

The sliding seat 301 is disposed on the supporting front cover 201 and slides relatively up and down, so that a component capable of supporting the sliding function needs to be set up, as shown in fig. 7 and 8, a sliding groove 207 is longitudinally disposed on the front surface of the supporting front cover 201, a sliding rod 206 is movably disposed in the sliding groove 207, in order to ensure that the sliding rod 206 can slide along a predetermined track in the sliding groove 207, a connecting block 208 for mounting the sliding rod 206 is disposed in the sliding groove 207, two ends of the sliding rod 206 are first penetrated out of the connecting block 208, and therefore, a through hole 209 for the sliding rod 206 to pass through is formed in the connecting block 208, so that two ends of the sliding rod 206 can penetrate through the connecting block 208 and can axially move along the connecting block; the connecting block 208 needs to be fixedly installed in the sliding groove 207, the connecting block 208 is connected with the connecting block 207 by using screws, a screw hole 210 is formed in one surface, which is attached to the sliding groove 207, of the connecting block 208, and a through hole 211 matched with the through hole is formed in a place, which is pre-used for installing the connecting block 208, of the sliding groove 207, so that after the sliding rod 206 is inserted in the connecting block 208, the position of the connecting block 208 is adjusted to align the screw hole 210 with the through hole 211, the connecting block 208 can be fixed in the sliding groove 207 by using screws, and then the sliding rod 206 is connected with the sliding seat 301, so that the sliding seat 301 can slide along with the up-down sliding of the sliding rod 206.

As for the connection mode of the sliding rod 206 and the sliding seat 301, after the sliding rod 206 is installed in the sliding groove 207, firstly, the sliding section of the sliding rod 206 in the sliding groove 207 needs to be limited, if the sliding rod 206 is a whole smooth round rod, the sliding rod is difficult to be limited in the longitudinal direction, therefore, as shown in fig. 7, the part of the sliding rod 206 at two connecting blocks 208 needs to be provided with a limiting piece 212, the limiting piece 212 can be a limiting piece welded on the sliding rod, or the middle part of the sliding rod 206 is flattened to form, and the width of the limiting piece 212 is larger than the diameter of the sliding rod 206, so that the sliding rod 206 cannot be limited in the movable section in the longitudinal direction through the avoidance opening 209; the limiting member 212 is provided with a connecting hole 213, and the sliding seat 301 is provided with an opening 214 at a corresponding position, and the connecting hole 213 is connected with the opening 214 by a screw, so that the sliding seat 301 and the sliding rod 206 are fixed and slide synchronously with respect to each other, and the sliding seat 301 slides up and down with respect to the bearing seat 203.

Because the sliding seat 301 will slide downward by default due to gravity, a setting member is required to pull the sliding seat 301 upward to maintain the sliding seat in a reset state, in this embodiment, a spring 400 is used to set an elastic member, and the spring 400 is located between the sliding seat 301 and the supporting front cover 201, and the spring 400 generates a reset elastic force in response to the sliding movement of the sliding seat 301 with limited deformation, and the position of the spring 400 is shown in fig. 7 and 16.

For the installation of the spring 400, two ends of the spring 400 can be respectively connected to the sliding seat 301 and the supporting front cover 201, but the force applied to the backrest is different in consideration of different weight of different people, so that people with different weight can find a force suitable for the people, and the tightness adjusting assembly 401 is arranged, so that the spring 400 can generate reset elastic force for the sliding seat 301, and the force required by the sliding seat 301 can be adjusted to match the requirements of different users; 11-13, the installation schematic diagram of the tightness adjusting assembly 401 is shown in the drawings, firstly, a shell 402 is installed at the upper end of the supporting front cover 201, a cavity 403 for installing an adjusting slide block 404 is arranged between the shell 402 and the supporting front cover 201, the adjusting slide block 404 needs to move up and down to pull a spring, therefore, a spiral opening 405 is arranged in the longitudinal direction of the adjusting slide block 404, a knob 407 with a spiral rod body 406 is inserted downwards from the upper side of the cavity 403 to be connected with the adjusting slide block 404, for the knob 407, firstly, a circular groove 409 is arranged at the upper end of the cavity 403, and a circular ring piece 410 matched with the circular groove 409 is arranged on the rod body of the knob 407, the circular ring piece 410 is clamped into the circular groove 409 and covers the shell 402, thus, the knob 407 and the supporting front cover 201 do not move relatively longitudinally, but the knob 407 can be matched with the spiral opening 405 in the adjusting slide block 404 relatively rotationally and drives the supporting front cover 201 to slide longitudinally; 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, so that the user can lie down to slide the sliding seat 301 downwards to stretch the spring 400 to generate upward reset elastic force, and the user sits down and then the sliding seat 301 is upwards bounces back to the original position under the action of the elastic force.

However, the user of the seat may want to use the back-up tilting of the backrest main body 100 at all times, so that a member for preventing the slide of the slide base 301 may be provided; as shown in fig. 14 to 17, a slip stopper 500 as shown in fig. 17 is provided between the supporting front cover 201 and the sliding base 301, and the slip stopper 500 is installed at the bottom ends of the supporting front cover 201 and the sliding base 301.

Before the non-slip piece 500 is installed, the method for connecting the bottom ends of the bearing front cover 201 and the sliding seat 301 is improved; as shown in fig. 16, there is a geometric shaped insert rod 501 penetrating the left and right ends of the supporting front cover 201, the geometric shaped insert rod 501 also serves to connect the supporting front cover 201 and the rotating support member 302, and the holes of the rotating support member 302 and the supporting front cover 201 through which the geometric shaped insert rod 501 passes are all circular through holes 502, so that the geometric shaped insert rod 501 and the rotating support member 302 are not rotated by rotation of one of them; in order to allow the geometric shaped insert 501 to be stably connected in the circular through hole 502, a washer 503 with a geometric shaped through hole 518 is arranged at the connection position of the two, the washer 503 is also axially protruded with an insert 504 matched with the circular through hole 502, so that the washer 503 can be simultaneously connected with the circular through hole 502 on the bearing front cover 201 and the rotating support 302.

The above description of the method of installing the geometric shaped insert 501 further explains the structure and installation of the anti-slip member 500 on the geometric shaped insert 501; as shown in fig. 16 and 17, a handle 505 for a user to use is arranged at one end of the geometric shaped inserted link 501, a rotating clamping block 506 and a limiting handle 507 as shown in fig. 17 are inserted into the geometric shaped inserted link 501 at a place for supporting the inside of the front cover, the rotating clamping block 506 is fixedly arranged on the geometric shaped inserted link 501 in the circumferential direction through a through groove 508 with the same section as the geometric shaped inserted link 501, the limiting handle 507 is fixedly connected with the rotating clamping block 505 relatively through a bolt hole 517 arranged at a matched position, and the user can drive the limiting handle 507 to rotate through the rotating handle 505; the limit handle 507 needs to stop rotating after rotating to the corresponding position; the rotating clamping block 506 needs to stop after rotating to the corresponding position, so that the anti-slip piece 500 can stably play a role in anti-slip, and therefore, as shown in fig. 14 and 15, a limiting clamping block 509 is arranged beside the rotating clamping block 506, and the limiting clamping block 509 is fixedly arranged on the bearing bracket 301; the rotating clamping block 506 axially rotates, two gears are formed by matching the different positions of the rotating clamping block 506 in the circumferential direction and the shape of the limiting clamping block 509, and the gear of the limiting handle 506 determines whether the sliding seat 301 can slide up and down; in fig. 2 and 14, the rotating clamping block 506 and the limiting handle 507 are in a storage state, at this time, the first limiting surface 510 on the rotating clamping block 506 abuts against the first locking position 511 on the limiting clamping block 509, and the first protrusion 512 is clamped into the limiting groove 513, so that the sliding seat 301 can move up and down on the supporting seat 203; when a user applies a certain rotational force to the handle 505, the first protrusion 512 is separated from the limit groove 513 and rotates until the second protrusion 516 is clamped into the limit groove 513, the second limit surface 514 on the rotating clamping block 506 abuts against the second locking position 515 on the limiting clamping block 506, and meanwhile, the rotating clamping block 506 drives the rotating handle 507 to be in an unfolded state, as shown in fig. 16, at this time, the upper end of the rotating handle 507 abuts against the anti-sliding groove 303 at the lower end of the sliding seat 301, and the sliding seat 301 cannot slide downwards any more.

The method for connecting the rotary support 302 and the backrest main body 100 uses the same geometric insert rod 501 and the washer 503 as described above, and since the rotary support 302 is connected with the bearing front cover 201 and the backrest main body 100 at a plurality of joints, the appearance is easy to be unaesthetic, in this embodiment, a decorative cover 304 is provided to cover the rotary support 302, as shown in fig. 6 and 16, the decorative cover 304 can cover the exposed studs at both ends of the geometric insert rod 501 at the same time, and further enhance the structural stability of the rotary support.

The invention and its embodiments have been described above by way of illustration and not limitation, and the invention is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present invention.

Claims (14)

1. The utility model provides a back of chair slides track change mechanism which characterized in that: comprises a backrest main body, a backrest bracket and a track-changing adjusting component arranged between the backrest main body and the backrest bracket; the track change adjusting assembly comprises a sliding seat and a rotating support piece, wherein the sliding seat is arranged on the back support and vertically slides along the back support, the back main body is rotationally connected with the sliding seat, the rotating support piece is arranged between the back support and the back main body, the rotating support piece is rotationally connected with the back support and the back main body respectively, when the sliding seat moves downwards along the back support, the back main body rotates backwards and the lower end of the back main body moves forwards, and the rotating support piece synchronously rotates and guides the rotating track of the back main body.

2. A chair back sliding track change mechanism according to claim 1, wherein: the middle section of the rear part of the backrest main body is fixedly provided with a connecting seat, and the whole connecting seat is L-shaped; the connecting seat comprises a main body part and an extending part extending forwards at the lower end of the main body part; two sides of the main body part are rotationally connected with two sides of the sliding seat; the rotating support piece is arranged below the sliding seat, the rear end of the rotating support piece is rotationally connected with the back support, and two sides of the front end of the extending part are rotationally connected with the front end of the rotating support piece.

3. A chair back sliding track change mechanism according to claim 2, wherein: the connecting seat comprises a base plate and side plates extending from the front to the back of the two sides of the base plate, the base plate is fixedly connected with the backrest main body, the extending part is formed by extending the lower ends of the side plates forwards, a containing space is formed between the base plate and the side plates, when the connecting seat is matched with the sliding seat, the sliding seat is positioned in the containing space, the side plates are rotationally connected with the sliding seat, and a allowance space for the backrest main body to rotate is reserved between the sliding seat and the base plate.

4. A chair back sliding track change mechanism according to claim 1, wherein: the back support is longitudinally provided with a bearing seat, the bearing seat comprises a bearing back cover and a bearing front cover which are fixedly connected to the back support, and the sliding seat is arranged on the bearing front cover and slides up and down relatively; the front surface of the bearing front cover is longitudinally provided with a sliding rod and a sliding groove, and the sliding rod is arranged in the sliding groove through a connecting block and can slide up and down; the sliding seat is provided with an opening at a position corresponding to the sliding rod when being arranged on the bearing front cover, the sliding rod is provided with a connecting hole matched with the opening, and a screw is screwed in to connect the sliding seat and the sliding rod; the sliding seat and the sliding rod synchronously move up and down to realize the up and down sliding of the sliding seat relative to the bearing seat.

5. The chair back sliding rail transfer mechanism of claim 4, wherein: the connecting blocks in each sliding groove are longitudinally provided with two avoidance openings for the sliding rods to pass through, the surfaces connected with the supporting front covers are provided with screw holes, the supporting front covers are provided with mounting grooves for placing the connecting blocks, the mounting grooves are provided with through holes matched with the screw holes, and the connecting blocks are connected with the supporting front covers by screwing screws.

6. The chair back sliding rail transfer mechanism of claim 4, wherein: the position in the middle of two connecting blocks on the sliding rod is provided with a limiting part, and the limiting part is limited to be unable to pass through an avoidance port on the connecting block, so that the movable interval after the sliding rod is installed is the distance between the upper connecting block and the lower connecting block.

7. The chair back sliding rail transfer mechanism of claim 6, wherein: the limiting piece is a limiting piece welded on the sliding rod; or the limiting piece is formed by flattening the middle part of the sliding rod, and the width of the limiting piece is larger than that of the sliding rod.

8. The chair back sliding rail transfer mechanism of claim 4, wherein: the bearing front cover is provided with a plurality of connecting bulges, and the bearing rear cover is provided with a connecting socket matched with the connecting bulges.

9. A chair back sliding track change mechanism according to claim 1, wherein: the elastic piece is configured between the sliding seat and the back support, and the elastic piece responds to the sliding of the sliding seat to generate reset elastic force through limited deformation.

10. The chair back sliding rail transfer mechanism of claim 9, wherein: the elastic component be the spring, be equipped with elasticity regulation subassembly between bearing protecgulum and the sliding seat, elasticity regulation subassembly includes the shell, and the shell is installed in bearing protecgulum upper end, and is equipped with the cavity between shell and the bearing protecgulum, is equipped with the regulation slider in the cavity, it has the spiral opening and is connected with the knob of taking the spiral pole body to adjust the slider upper end along vertically opening, the knob presss from both sides between shell and bearing protecgulum and knob circumferential direction, axial fixity, the spring lower extreme is connected with sliding seat rear surface bottom, the regulation slider is connected to the spring upper end, the knob rotates and drives the regulation slider and reciprocate for the initial length of spring is adjusted, the reset elasticity that provides when making the sliding seat slide produces and changes.

11. A chair back sliding track change mechanism according to claim 1, wherein: the sliding block is arranged between the sliding seat and the back support, and the sliding block can not slide up and down by abutting against the sliding seat in the longitudinal direction.

12. The chair back sliding rail transfer mechanism of claim 11, wherein: the rotary joint of the bearing bracket and the rotary support piece is a circular through hole, a gasket with a geometric through hole is arranged between the bearing bracket and the rotary support piece, the gasket comprises a gasket body and an inserted link protruding along the axial direction of the gasket, the inserted link is inserted into the circular through hole of the bearing bracket and the rotary support piece and is connected with the bearing bracket and the rotary support piece, and the geometric inserted link with the cross section shape matched with the geometric through hole is inserted into the circular through holes at two ends; the end head of one end of the geometric shaped inserted link is connected with a handle, the handle is provided with a geometric shaped slot which is connected with the geometric shaped inserted link, and the rod body of the geometric shaped inserted link is provided with a non-slip piece.

13. The chair back sliding rail transfer mechanism of claim 11, wherein: the anti-slip piece comprises a rotary clamping block and a limiting handle which are arranged on the geometric rod body of the inserted rod, and the rotary clamping block is inserted into the inserted pin through a matched inserted pin hole; the bearing bracket is provided with a limiting clamping block at a position matched with the rotating clamping block, the rotating clamping block is provided with a first limiting surface and a second limiting surface, a first bulge and a second bulge are arranged along the circumferential direction, the limiting clamping block is provided with a first locking position and a second locking position which are matched with each other, and a limiting groove matched with the bulge is arranged on the limiting clamping block; when the first limiting surface is contacted with the first locking position, the first bulge is clamped in the limiting groove, and the anti-slip piece does not play a role in anti-slip at the moment; the user rotates the handle and breaks away from first spacing face from first locking position, and simultaneously first arch also breaks away from the spacing groove, rotates to second spacing face and second locking position contact and make the protruding card of second go into spacing inslot, and the sliding seat downside is equipped with the spacing groove of handle, and when spacing fixture block rotated to the protruding card of second go into spacing inslot, spacing handle supported the spacing groove of handle on the sliding seat and made the sliding seat can not slide down any more.

14. A chair back sliding track change mechanism according to claim 12, wherein: the rotary support piece is provided with a decorative cover along the whole body, and the decorative cover wraps the joint of the rotary support piece, the bearing seat and the backrest main body.