CN217771842U - Seat support structure capable of moving cushion back and forth - Google Patents

Abstract

The utility model relates to a chair seat support technical field, concretely relates to seat support structure that can back-and-forth movement cushion, including chassis, cushion, fix the limit baffle on the chassis and fix the sliding support on the cushion, be provided with the slip table that is located the limit baffle below on the chassis, be formed with the spacing spout that extends along the fore-and-aft direction between slip table and the limit baffle, sliding support is located the slip table and has the slip head that stretches into in the spacing spout, and the sliding support drives the slip head back-and-forth movement in the spacing spout when the back-and-forth movement is gone up to the slip table, and the installing port that link up from top to bottom has been seted up on the limit baffle, and the installing port supplies the slip head passes in and out spacing spout along upper and lower direction. Simple to operate, the cost is very low, and detachable installation when inside spare part trouble appears in follow-up use, directly removes sliding support to the position that the slip head aimed at from top to bottom with the installation head, and up carry the cushion and just can wholly tear down, carry out the maintenance and the change of inside spare part.

Description

Seat support structure capable of moving cushion back and forth

Technical Field

The utility model relates to a chair seat support technical field, concretely relates to seat support structure of cushion can back-and-forth movement.

Background

The chair on the market at present all possesses the seat support liftable, function that back of the chair inclination is adjustable for satisfying user's different size and different position of sitting, and after the user sat on the chair, in self face direction and back of the body direction these two front and back directions, also need to satisfy self comparatively comfortable position of sitting through the position of adjusting the seat support occasionally, especially to children's seat, the seat support back-and-forth movement all has very big meaning to correcting children's position of sitting, reading the book posture etc. and this just needs whole chair of moving of whole removal to drive the seat support and shifts in the front and back direction, thereby make the seat support move to the position that needs on. This is troublesome, especially for chairs with brackets without rollers, the overall movement of the chair is inconvenient.

In order to solve the above problems, a chair with a cushion capable of moving forward and backward independently has been developed, for example, a seat bottom case capable of moving forward and backward disclosed in patent application No. CN202121223476.3, the seat bottom case capable of moving forward and backward comprises a cushion main body and a chassis, the chassis is provided with a limiting hole around, the hole is connected with the cushion main body through a fixed slide block, and a sliding track is movably connected between the cushion main body and the chassis; the novel seat cushion is characterized in that a sawtooth-shaped sliding gear is fixed at the bottom of the seat cushion main body, a sliding adjusting switch is arranged at the corresponding position of the chassis, six clamping grooves are formed in the sliding gear, the sliding adjusting switch is fixed through a switch fixing piece, a switch pressure spring groove is formed in the bottom of the sliding adjusting switch, and a switch pressure spring is arranged in the groove. This patent is adjusted through slide adjusting switch and is fixed cushion drain pan around spacing downthehole regulation to adjust the position around the cushion, realize the user demand to different size users. However, in the patent, the cushion main body is connected with the limiting hole through the fixed slide block, the fixed slide block plays a role in limiting the cushion main body to move only along the limiting hole, and simultaneously plays a role in pulling the cushion main body and enabling the cushion main body not to move away from the chassis, namely, the cushion main body cannot be detached from the chassis as long as the fixed slide block exists, and the fixed slide block and the cushion main body support are not detachably fixed, so that the fixed slide block is required to be permanently and fixedly connected to the cushion main body during factory processing, the cushion main body and the chassis are also undetachably connected, and only relative movement in the front-back direction can be generated between the cushion main body and the chassis; therefore, the processing and manufacturing cost is increased in a factory, and in the subsequent use process, once a certain part between the cushion main body and the chassis is broken down, the cushion main body is difficult to repair or even replace, so that the maintenance cost is increased.

SUMMERY OF THE UTILITY MODEL

The utility model discloses make the improvement to the problem that above-mentioned prior art exists, promptly the utility model aims to solve the technical problem that a seat support structure that can back-and-forth movement cushion is provided, include chassis, cushion, fix limit baffle on the chassis and fix sliding support on the cushion, be provided with on the chassis and be located the slip table of limit baffle below, the slip table with be formed with the spacing spout that extends along the fore-and-aft direction between the limit baffle, sliding support is located stretch into and have on the slip table the sliding head in the spacing spout, sliding support is in drive when the back-and-forth movement is gone up on the slip table the sliding head is in back-and-forth movement in the spacing spout, the installing port that link up from top to bottom is seted up on the limit baffle, the installing port supplies the sliding head passes in and out along upper and lower direction spacing spout.

As the utility model discloses a preferred, still include detachably to fix stop on the chassis, stop can the sliding head moves completely and stops before the installing port under the cushion.

As the utility model discloses a preferred, the installing port is located limit baffle's rear end, the interception installation department has been seted up at the rear portion on chassis, the interception piece be can with the fixed post that blocks can be dismantled to the interception installation department, the post that blocks is supporting to block behind the cushion can block the cushion is toward the removal in rear.

As the utility model discloses a preferred, the cushion orientation be fixed with the backup plate that supports that stretches out down on the face on chassis, the cushion passes through the backup plate with it leans on to block the post counterbalance.

As the utility model discloses a preferably, two around the limit baffle concatenation forms the limit baffle subassembly, sliding support has two around the slider, and two interval and two between the slider interval between the installing port is unanimous.

As the optimization of the utility model, the utility model also comprises a locking component, the locking component comprises a locking seat, a transmission part connected with the locking seat and a plurality of first locking lugs which are fixed on the locking seat and are uniformly arranged in the front and back direction, a plurality of second locking lugs which are uniformly arranged in the front and back direction are fixed on the sliding support, and the distance between two adjacent first locking lugs is consistent with the distance between two adjacent second locking lugs; the sliding support is characterized in that a clamping sliding groove is formed in the sliding table, the clamping seat is located in the clamping sliding groove and can move left and right, and the clamping seat achieves clamping of the sliding support through staggered inserting and meshing between the first clamping lug and the second clamping lug.

As the utility model discloses a preferred, two around the limit baffle subassembly is still including being located link up portion between the limit baffle, link up portion has the orientation the end block subassembly and with what end block the spout is linked together dodges the groove, end the seat with first end block lug can follow left right direction and remove and get into dodge the inslot.

As the utility model discloses a preferred, the confession has been seted up on the chassis the hole is stretched out to the transmission portion, dodge about the inslot be provided with transverse connection the card end seat with the compression spring of linking portion.

As a preferred aspect of the present invention, the chassis is provided with two of the limiting baffle assemblies and two of the sliding tables which are bilaterally symmetric, the cushion is provided with two of the sliding supports which are bilaterally symmetric, the sliding support on the left side is correspondingly arranged on the sliding table on the left side, and the sliding support on the right side is correspondingly arranged on the sliding table on the right side; the sliding support on the left side and/or the sliding support on the right side are correspondingly matched with the clamping and stopping assembly.

As the utility model discloses a preferred, still be provided with bilateral symmetry's two guide slide that extend along the fore-and-aft direction on the chassis, be provided with bilateral symmetry's two guide slide that extend along the fore-and-aft direction on the cushion, guide slide has about two straight inside walls that extend along the fore-and-aft direction, guide slide has about two straight lateral walls that extend along the fore-and-aft direction, the cushion is installed back on the chassis guide slide is stretched into just in the guide slide straight inside wall with straight lateral wall pastes and leans on, guide slide can slide around in the guide slide.

Has the advantages that:

the installation is very convenient and fast, and the installation process cost is very low, what realize moreover is detachable installation, when the inside spare part trouble appears in the follow-up use, directly moves sliding support to the position that the slider aimed at from top to bottom with the installation head, and upward carrying the cushion just can wholly be torn open, carries out the maintenance and the change of inside spare part, has reduced the maintenance cost.

Drawings

FIG. 1 is a schematic view of the seat construction;

FIG. 2 is a schematic structural view of the base pan;

FIG. 3 is a schematic view of the limiting baffle fixed to the chassis;

FIG. 4 is a schematic structural view of the retainer plate assembly;

fig. 5 is a schematic structural view of the seat cushion;

FIG. 6 is a schematic structural view of the sliding support;

FIG. 7 is a schematic view of the shoe mounted to the chassis;

FIG. 8 is a schematic view of the position relationship among the locking assembly, the sliding support and the limiting baffle assembly;

FIG. 9 is a schematic view of the first locking protrusion and the second locking protrusion being engaged with each other in a staggered manner.

Detailed Description

The following specific embodiments are merely illustrative of the present invention, and are not intended to limit the present invention, and those skilled in the art can make modifications of the present embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent laws and protection within the scope of the present invention.

The utility model relates to a seat support structure of back-and-forth movement cushion 2, include chassis 1, cushion 2, fix spacing baffle 3 on the chassis 1 and fixing sliding support 4 on the cushion 2, be provided with on the chassis 1 and be located the slip table 5 of spacing baffle 3 below, slip table 5 with be formed with the spacing spout 6 that extends along the fore-and-aft direction between the spacing baffle 3, sliding support 4 is located slip table 5 is last and have and stretch into slider 41 in the spacing spout 6, sliding support 4 is in drive when the back-and-forth movement is gone up to slip table 5 slider 41 is in back-and-forth movement in the spacing spout 6, the installing port 31 that link up about seting up on the spacing baffle 3, installing port 31 supplies slider 41 passes in and out along upper and lower direction spacing spout 6. During installation, the cushion 2 is placed on the chassis 1, so that the sliding head 41 on the sliding support 4 enters the limiting sliding groove 6 from top to bottom through the installation opening 31, the sliding support 4 is placed on the sliding table 5, the body of the sliding support 4 is positioned beside the limiting baffle 3, as long as the sliding head 41 moves back and forth in the limiting sliding groove 6 and leaves the installation opening 31, the limiting baffle 3 and the sliding table 5 limit the sliding head 41 in the upper direction and the lower direction respectively, but the sliding support 4 can only move on the sliding table 5 in the front-back direction in the embodiment, so that the sliding head 41 is fully limited and can only move in the front-back direction, namely the installation of the sliding support 4 on the chassis 1 is realized, namely the installation of the cushion 2 on the chassis 1 is realized; the installation is very convenient and fast, the installation process cost is very low, the detachable installation is realized, when internal parts have faults in the subsequent use process, the sliding support 4 is directly moved to the position where the sliding head 41 is aligned with the installation head up and down, the cushion 2 can be integrally detached by lifting up, the maintenance and the replacement of the internal parts are carried out, and the maintenance cost is reduced. In this embodiment the spacing spout 6 is right the restriction of slider 41 has realized the installation of sliding support 4 on chassis 1, make cushion 2 can not break away from chassis 1, and chassis 1 mainly still relies on slip table 5 to sliding support 4's support to cushion 2 holistic support and cushion 2 back-and-forth movement to realize, it is higher to support slide structural strength itself, and slip table 5 can produce stable support to it, thereby guarantee that cushion 2 is whole when having realized the back-and-forth movement function, can also obtain stable support, guarantee that cushion 2 can not be weakened because of the existence of removal function to the support effect of human body. In this embodiment, the sliding support 4 can only move on the sliding table 5 in the front-back direction, so that the chassis 1 has a limiting structure that limits the sliding support 4 in the left-right direction without hindering the front-back movement thereof, such as a rib plate on the sliding table 5, or other parts, and the limitation can be realized only by abutting against the left and right side walls of the sliding support 4. In this embodiment, the sliding table 5 is formed by straight upper edges of a plurality of vertically arranged rib plates. The front in this embodiment refers to the direction in which the user faces upward when sitting on the seat structure, and the rear refers to the direction in which the user faces back when sitting on the seat structure.

After the cushion 2 is installed on the chassis 1 through the sliding support 4, the cushion can move back and forth to adjust the position, the moving stroke of the sliding head 41 in the sliding support 4 in the limiting sliding groove 6 includes the position of the installation opening 31, so when the sliding head 41 moves to the position of the installation opening 31 in the moving process, if the cushion 2 is carelessly exerted with an upward lifting force, the sliding head 41 can be separated from the limiting sliding groove 6 through the installation opening 31, the cushion 2 is integrally separated from the chassis 1, the cushion needs to be installed again, and potential safety hazards exist. Therefore, the present embodiment preferably further comprises a stopping member detachably fixed on the chassis 1, and the stopping member can stop the seat cushion 2 before the sliding head 41 completely moves to the position right below the mounting opening 31, so that the position of the mounting opening 31 is not included in the whole movable stroke range of the sliding head 41, and the situation that the sliding head 41 passes through the mounting opening 31 and is separated from the limiting chute 6 in the use process is avoided. When the sliding support 4 is initially installed on the chassis 1, the movable travel range of the sliding head 41 includes the position of the installation opening 31, so that the stopping piece needs to be installed on the chassis 1 after the seat cushion 2 is installed, the travel range of the sliding head 41 is reduced, and the stopping piece is detachably and fixedly connected with the chassis 1. In the present embodiment, the stopping member is mainly implemented by a simple mechanical structure, so that the stopping member is only cut and deleted in consideration of the front end or the rear end of the entire stroke of the slider 41, that is, the maximum distance that the slider 41 can reach when moving forward or the maximum distance that the slider can reach when moving backward is reduced. Under the above premise, the mounting opening 31 is arranged at the front end or the rear end of the limit baffle 3, so as to improve the utilization rate of the limit chute 6 as much as possible.

If the mounting opening 31 is arranged at the front end of the limit baffle 3, the seat cushion 2 needs to be stopped when moving to the front end, at the moment, the front part of the seat cushion 2 extends out of the chassis 1, and the rear part of the chassis 1 loses the coverage of the seat cushion 2, so that a component for blocking the seat cushion 2 from moving forwards is difficult to be arranged on the chassis 1, and a component for pulling the seat cushion 2 from the rear is required to be arranged on the chassis 1, but the component is difficult to avoid in the process of moving the seat cushion 2 backwards; if the mounting opening 31 is arranged at the rear end of the limit baffle 3, the seat cushion 2 needs to be stopped when moving to the rear end, and the rear part of the chassis 1 is gradually covered by the seat cushion 2 moving backwards, in the process, the seat cushion 2 can be stopped moving backwards as long as the stopping piece is arranged at the part of the chassis 1 to simply block the seat cushion 2, the structure and the principle are very simple, and the interference problem does not need to be considered; therefore, the second embodiment is preferably adopted in this embodiment. Specifically, in this embodiment installing port 31 is located limit baffle 3's rear end, interception installation department 12 has been seted up at chassis 1's rear portion, the interception piece for can with interception installation department 12 can dismantle fixed post that blocks, after cushion 2 installs on chassis 1, make interception installation department 12 expose with cushion 2 forward movement, then will block the post and install in interception installation department 12, later cushion 2 during backward movement, as long as remove to and block the post counterbalance and lean on, just can't continue backward movement again, slider 41 just also can't remove completely under installing port 31 to solve the problem that cushion 2 probably breaks away from chassis 1 in the use. Modes such as buckle fixing, thread fixing and the like can be adopted between the blocking column and the stopping installation part 12, the stopping installation part 12 is preferably arranged in the threaded hole in the chassis 1, the stopping part is a bolt capable of being matched with the threaded hole, and when the bolt is screwed into the threaded hole, the tail part of the bolt extends out of the upper part to be used for blocking the seat cushion 2. In the embodiment, preferably, a supporting plate 13 extending downwards is fixed on the surface of the seat cushion 2 facing the chassis 1, the seat cushion 2 supports against the blocking column through the supporting plate 13, and the supporting plate 13 supports against the stopping element, so that the body of the seat cushion 2 is prevented from being damaged by the stopping element, the force transmission effect is better, and the blocking effect is better; in addition, the support plate 13 is arranged below the seat cushion 2, and when the support plate 13 supports against the stop piece, the body of the seat cushion 2 covers the support plate 13 and the stop piece from the upper part, so that the overall attractiveness is not affected.

The limitation of the limiting sliding chute 6 on the sliding head 41 realizes the installation of the cushion 2 on the chassis 1, if only one sliding head 41 extends into the limiting sliding chute 6, the installation between the sliding support 4 and the chassis 1 is unstable, so that the whole cushion 2 is unstable relative to the chassis 1, the cushion 2 is easy to shake, and the use comfort and safety are affected; unless the length of the sliding head 41 itself in the front-rear direction is large, stability can be improved, but this will cause the mounting opening 31 matching with the sliding head 41 to be long, and although the sliding head 41 will not be separated from the limit chute 6 as long as the sliding head 41 is not entirely located right below the mounting opening 31, in this case, one end of the sliding head 41 will still easily tilt up from the mounting opening 31, and is also unstable, and even may cause damage to the limit baffle 3. Therefore, two around this embodiment is preferred limit baffle 3 splices and forms limit baffle 3 subassembly, these two limit baffle 3's gesture is unanimous, all extends along the fore-and-aft direction promptly, and installing port 31 all is located the rear end, forms same spacing spout 6 between limit baffle 3 subassembly and the slip table 5, sliding support 4 has two around the slider 41, and two interval and two between the slider 41 the interval between the installing port 31 is unanimous, when the installation, needs the slider 41 in the place ahead to aim at the installing port 31 in the place ahead, and the slider 41 in the place behind aims at the installing port 31 in the place behind. The sliding support 4 is installed on the chassis 1 through the two sliding heads 41, so that the stability of the sliding support 4 on the chassis 1 is effectively improved, and the cushion 2 cannot easily shake

The existence of the stopping piece makes the cushion 2 can not break away from the chassis 1 in the whole stroke range of the back-and-forth movement, but when in normal use, the user moves the cushion 2 to a certain position, and then the cushion 2 is required to be fixed on the position all the time to meet the daily use, otherwise, the cushion 2 is easy to shift and the position of the offset adjustment is easy to be caused in the use process. Therefore, the present embodiment preferably further includes a locking assembly 7, the locking assembly 7 includes a locking seat 71, a transmission portion 72 connected to the locking seat 71, and a plurality of first locking protrusions 73 fixed on the locking seat 71 and arranged at regular intervals from front to back, the sliding support 4 is fixed with a plurality of second locking protrusions 42 arranged at regular intervals from front to back, and a distance between two adjacent first locking protrusions 73 is the same as a distance between two adjacent second locking protrusions 42; a clamping and stopping sliding groove 51 is formed in the sliding table 5, the clamping and stopping seat 71 is located in the clamping and stopping sliding groove 51 and can move left and right, and the clamping and stopping seat 71 realizes the clamping and stopping of the sliding support 4 through the staggered splicing and meshing between the first clamping and stopping bump 73 and the second clamping and stopping bump 42. When the position needs to be adjusted, the clamping seat 71 is moved away from the sliding support 4 by pressing the transmission part 72, so that the first clamping lug 73 and the second clamping lug 42 are separated from a staggered splicing engagement state, and the sliding support 4 can move back and forth on the sliding table 5, namely, the seat cushion can be moved back and forth to adjust the position; after the seat cushion 2 is adjusted to a required position, the locking seat 71 is moved towards the sliding support 4 by pulling the transmission part 72 until the first locking lug 73 enters between two adjacent second locking lugs 42, and the staggered insertion engagement between the first locking lug 73 and the second locking lug 42 is realized, so that the sliding support 4 is limited from moving in the front-back direction, and the seat cushion 2 is also limited from moving in the front-back direction, so that the seat cushion 2 can be kept in the position for a long time.

In this embodiment, the assembly of the limiting baffle 3 further includes an engaging portion 8 located between the front and rear limiting baffles 3, the engaging portion 8 has an avoiding groove 81 facing the locking assembly 7 and communicating with the locking sliding groove 51, and the locking seat 71 and the first locking protrusion 73 can move in the left-right direction into the avoiding groove 81; when the locking seat 71 moves away from the sliding support 4 and enters the avoiding groove 81, the sliding support 4 is out of limit and can move back and forth; when the locking seat 71 moves towards the sliding seat 4 and is engaged with the second locking protrusion 42 on the sliding seat 4 through the first locking protrusion 73 in a staggered insertion manner, the sliding seat 4 is restricted from moving forward and backward. The clamping sliding groove 51 is attached to the outer wall of the transmission part 72, so that the left-right movement path of the transmission part 72 is normalized, and the precision of the movement path of the clamping component 7 is improved; dodge groove 81 with the outer wall of card ends seat 71 pastes mutually and leans on, standardizes the route that moves about card ends seat 71, further improves the precision that stops subassembly 7 and remove the route to improve the first precision that stops crisscross grafting meshing between lug 73 and the second of stopping that stops the lug 42, avoid appearing the condition of grafting meshing failure, improve use comfort. In this embodiment, the chassis 1 is provided with an extending hole for extending the transmission portion 72, a compression spring laterally connecting the locking seat 71 and the connecting portion 8 is disposed in the avoiding groove 81, the locking assembly 7 needs to be manually pressed to be driven, and the transmission portion 72 in the locking assembly 7 extends from the side portion of the chassis 1 along the left-right direction for being pressed by a user; when pressed by the user, the stop seat 71 moves away from the sliding support 4 and presses the compression spring; when the user stops pressing, the compression spring is returned and pushes the stopper 71 toward the shoe 4, re-restraining the shoe 4.

In order to further improve the stability of the seat cushion 2, in this embodiment, it is preferable that the chassis 1 is provided with two bilaterally symmetric limit baffle 3 assemblies and two bilaterally symmetric sliding tables 5, the seat cushion 2 is provided with two bilaterally symmetric sliding supports 4, the left sliding support 4 is correspondingly arranged on the left sliding table 5, and the right sliding support 4 is correspondingly arranged on the right sliding table 5 to realize the installation on the chassis 1; the stability of the seat cushion 2 is improved by the left and right installation. The restriction of the forward and backward movement of the seat cushion 2 can be realized as long as any one of the left and right sliding supports 4 is restricted by the locking component 7, so that the locking component 7 is correspondingly matched with the sliding support 4 on the left side and/or the sliding support 4 on the right side, and the locking component 7 is preferably arranged on one side in the embodiment, thereby facilitating the adjustment of a user.

Further improve, preferably still be provided with two guide slide 91 that extend along the fore-and-aft direction of bilateral symmetry on the chassis 1, be provided with two guide slide 92 that extend along the fore-and-aft direction of bilateral symmetry on the cushion 2, guide slide 91 has about two straight inside walls that extend along the fore-and-aft direction, guide slide 92 has about two straight lateral walls that extend along the fore-and-aft direction, the cushion 2 is installed back on the chassis 1 guide slide 92 stretches into in the guide slide 91 just straight inside wall with straight outside wall pastes and leans on, guide slide 92 can slide around in the guide slide 91. Cushion 2 except through the installation of sliding support 4 on chassis 1 like this, can also rely on the matching of direction slide 91 and direction draw runner 92 to further improve fastness and mobility stability, reduces and rocks, improves the travelling comfort.

The chair seat structure of the utility model is used for chairs.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. The utility model provides a seat support structure of cushion can move back and forth, its characterized in that includes chassis (1), cushion (2), fixes limit baffle (3) on chassis (1) and fix sliding support (4) on cushion (2), be provided with on chassis (1) and be located sliding table (5) of limit baffle (3) below, sliding table (5) with be formed with between limit baffle (3) along the spacing spout (6) of fore-and-aft direction extension, sliding support (4) are located on sliding table (5) and have and stretch into slider (41) in spacing spout (6), sliding support (4) are in drive in the back and forth movement on sliding table (5) slider (41) are in back and forth movement in spacing spout (6), set up installing port (31) that link up from top to bottom on limit baffle (3), installing port (31) supply slider (41) pass in and out along upper and lower direction spacing spout (6).

2. A seat structure for a seat cushion capable of moving forward and backward according to claim 1, further comprising a stopping member detachably fixed to said base plate (1), said stopping member being capable of stopping said seat cushion (2) before said slide head (41) is completely moved right below said mounting opening (31).

3. The chair seat structure capable of moving the seat cushion back and forth according to claim 2, wherein the mounting port (31) is located at the rear end of the limit baffle (3), the rear portion of the chassis (1) is provided with a stopping mounting portion (12), the stopping member is a blocking column capable of being detachably fixed with the stopping mounting portion (12), and the blocking column can block the seat cushion (2) from moving backwards after abutting against the seat cushion (2).

4. A seat structure of a seat cushion capable of moving forward and backward according to claim 3, wherein a downward extending abutting plate (13) is fixed on the surface of the seat cushion (2) facing the chassis (1), and the seat cushion (2) abuts against the blocking column through the abutting plate (13).

5. The seat structure of the seat cushion capable of moving back and forth according to claim 3, wherein the front limit baffle and the rear limit baffle (3) are spliced to form a limit baffle assembly, the sliding support (4) is provided with a front sliding head and a rear sliding head (41), and the distance between the two sliding heads (41) is consistent with the distance between the two mounting openings (31).

6. The seat structure of the seat cushion capable of moving forward and backward according to claim 5, further comprising a locking component (7), wherein the locking component (7) comprises a locking seat (71), a transmission part (72) connected with the locking seat (71), and a plurality of first locking protrusions (73) fixed on the locking seat (71) and uniformly arranged back and forth, a plurality of second locking protrusions (42) fixed on the sliding support (4) and uniformly arranged back and forth, and the distance between two adjacent first locking protrusions (73) is consistent with the distance between two adjacent second locking protrusions (42); a clamping sliding groove (51) is formed in the sliding table (5), the clamping seat (71) is located in the clamping sliding groove (51) and can move left and right, and the clamping seat (71) achieves clamping of the sliding support (4) through staggered splicing and meshing between the first clamping lug (73) and the second clamping lug (42).

7. The seat structure of a seat cushion capable of moving back and forth according to claim 6, wherein the limit baffle assembly further comprises an engaging portion (8) located between the front limit baffle and the rear limit baffle (3), the engaging portion (8) has an avoiding groove (81) facing the locking assembly (7) and communicating with the locking sliding groove (51), and the locking seat (71) and the first locking protrusion (73) can move in the left-right direction into the avoiding groove (81).

8. The seat structure of the seat cushion capable of moving forward and backward according to claim 7, wherein the chassis (1) is provided with a hole for the transmission part (72) to extend out, and the avoiding groove (81) is internally provided with a compression spring which is transversely connected with the locking seat (71) and the connecting part (8) from left to right.

9. The seat structure capable of moving the seat cushion back and forth according to claim 8, wherein the chassis (1) is provided with two bilaterally symmetric limit baffle assemblies and two bilaterally symmetric sliding tables (5), the seat cushion (2) is provided with two bilaterally symmetric sliding supports (4), the left sliding support (4) is correspondingly arranged on the left sliding table (5), and the right sliding support (4) is correspondingly arranged on the right sliding table (5); the sliding support (4) on the left side and/or the sliding support (4) on the right side are/is correspondingly matched with the clamping component (7).

10. The chair seat structure capable of moving the seat cushion back and forth according to claim 9, wherein the chassis (1) is further provided with two bilaterally symmetrical guide slideways (91) extending in the front-back direction, the seat cushion (2) is provided with two bilaterally symmetrical guide slideways (92) extending in the front-back direction, the guide slideways (91) are provided with two left and right straight inner side walls extending in the front-back direction, the guide slideways (92) are provided with two left and right straight outer side walls extending in the front-back direction, the seat cushion (2) is mounted on the chassis (1) and then the guide slideways (92) extend into the guide slideways (91) and the straight inner side walls are attached to the straight outer side walls, and the guide slideways (92) can slide back and forth in the guide slideways (91).

Images