CN221865220U - Chassis structure and seat - Google Patents

Abstract

The utility model discloses a chassis structure and a seat, wherein the chassis structure comprises: the supporting device comprises a bottom shell, a bottom plate, a rear bracket and an elastic linkage assembly, wherein the elastic linkage assembly is arranged in the bottom shell, the front end of the bottom plate is connected with the elastic linkage assembly, the bottom end of the rear bracket is movably connected with the bottom shell, and the middle part of the rear bracket is rotatably connected with the rear end of the bottom plate; the elastic linkage assembly comprises a plurality of telescopic rods, a connecting seat and a linkage piece connected with the bottom plate, wherein the periphery of each telescopic rod is sleeved with the elastic piece, the rear ends of the telescopic rods are hinged to the bottom shell, the front ends of the telescopic rods are connected with the connecting seat, the linkage piece is rotatably connected to the front end of the bottom shell, and the connecting seat is connected with the linkage piece; the rear bracket can drive the bottom plate to drive the linkage piece to rotate, and the linkage piece can drive the connecting seat to compress the telescopic rod and the elastic piece. In the process of the user leaning back, the back support or the back rest and the bottom plate connected with the back support can move along with the leaning back of the human body, so that the buttocks and the back of the human body can be better supported.

Description

A chassis structure and a seat

Technical Field

The utility model relates to the technical field of seat manufacturing, in particular to a chassis structure and a seat.

Background Art

The structure of an existing seat includes a seat cushion, a backrest, armrests and a lumbar support. The seat cushion can provide support for the entire buttocks of the human body. The design of the seat cushion is closely related to the riding comfort of the user. However, in the related art, the seat cushion of some chairs is fixed on the chair and cannot support the user's buttocks as the user leans back, affecting the user's experience.

Utility Model Content

The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a chassis structure, in which the rear bracket or the backrest connected to the back bracket is synchronously linked with the bottom plate during the user's backward leaning process, and can move along with the backward leaning of the human body, thereby better supporting the buttocks and back of the human body, which is conducive to improving the user experience.

In a second aspect, the utility model also proposes a seat using the above chassis structure.

According to the first aspect of the utility model, the chassis structure provided by the embodiment includes: a supporting device, the supporting device includes a bottom shell, a bottom plate, a rear bracket and an elastic linkage component, the elastic linkage component is arranged in the bottom shell, the front end of the bottom plate is connected to the elastic linkage component, the bottom end of the rear bracket is movably connected to the bottom shell, and the middle part is rotatably connected to the rear end of the bottom plate; the elastic linkage component includes a plurality of telescopic rods, a connecting seat and a linkage member connected to the bottom plate, the outer periphery of each of the telescopic rods is sleeved with an elastic member, and the plurality of telescopic rods are arranged side by side along the front and rear directions of the bottom shell, the rear end of the telescopic rod is hinged to the bottom shell, the front end is connected to the connecting seat, the linkage member is rotatably connected to the front end of the bottom shell, and the connecting seat is connected to the linkage member; wherein, rotating the rear bracket can drive the bottom plate, the bottom plate can drive the linkage member to rotate, and the rotation of the linkage member can drive the connecting seat so that the connecting seat compresses the telescopic rod and the elastic member.

The chassis structure provided in the embodiment of the first aspect of the utility model has at least the following beneficial effects: the chassis structure is applied to the seat, the rear bracket serves as a backrest or the rear bracket is connected to the backrest, when the user sits on the bottom plate and leans against the rear bracket or the backrest connected to the back bracket, the rear bracket or the backrest connected to the back bracket can drive the front end of the bottom plate to be pressed down during the force rotation, and the downward pressure of the bottom plate can drive the linkage part to rotate, and the rotation of the linkage part can drive the connecting seat to make the connecting seat compress the telescopic rod and the elastic part, and the compression of the telescopic rod and the elastic part can provide a reaction force to support the human body. During the process of the user leaning back, the rear bracket or the backrest connected to the back bracket is synchronously linked with the bottom plate and can move with the backward leaning of the human body, thereby better supporting the human body's buttocks and back, which is beneficial to improving user experience.

According to the chassis structure provided by the embodiment of the first aspect of the utility model, it also includes a control device, which includes a wire control assembly, a gear member and a control plate. An installation groove is provided on the lower side of the connecting seat, and the control plate is arranged in the installation groove and can rotate. The gear member is provided at the front end of the bottom shell, and a plurality of gear grooves are provided on the side of the gear member facing the connecting seat. The plurality of gear grooves are arranged at intervals along the rotation direction of the bottom plate. The wire control assembly can pull the control plate to make the control plate enter or leave the gear groove.

According to the chassis structure provided by the embodiment of the first aspect of the utility model, the wire control assembly includes a wire seat, a first pull wire, a locking member, a locking seat, a reset member and a second pull wire, the wire seat is slidably connected to the bottom plate, a buckling boss is provided in the middle of the locking seat, a first slide groove and a second slide groove connected end to end are provided on the periphery of the buckling boss, the buckling boss is provided with a buckling groove connected to the first slide groove and the second slide groove, one end of the locking member is fixed to the wire seat, and the other end is located in the first slide groove, one end of the reset member is connected to the locking seat, and the other end is connected to the wire seat, the end of the first pull wire is connected to the wire seat, and one end of the second pull wire is connected to the A control plate, the other end of which is connected to the wire seat. When the first pull wire is pulled to drive the wire seat to slide, the end of the locking piece can be inserted into the buckle groove along the first slide groove, and the end of the locking piece can be inserted into the buckle groove along the first slide groove. The second pull wire can pull the control plate to keep the control plate separated from the gear slot; when the first pull wire is pulled again, the end of the locking piece is separated from the buckle groove, and the end of the locking piece is separated from the buckle groove, the reset piece drives the locking piece to reset, and the locking piece can slide along the second slide groove to return to the first slide groove, and the second pull wire can pull the control plate to keep the control plate stuck in the gear slot.

According to the chassis structure provided by the embodiment of the first aspect of the utility model, the bottom plate is provided with a mounting box, and the wire seat, the locking member, the locking seat and the reset member are all arranged in the mounting box.

According to the chassis structure provided by the embodiment of the first aspect of the utility model, a slide rail is provided at the bottom of the installation box, a slide groove matching with the slide rail is provided at the bottom of the wire seat, and the slide rail is inserted into the slide groove.

According to the chassis structure provided by the embodiment of the first aspect of the utility model, it also includes a tension adjustment device, which includes a driving member, a transmission rod, a transmission gear and a driving screw. The driving screw is threadedly connected to the connecting seat. The driving member, the transmission rod and the transmission gear are arranged on the bottom shell and are connected in sequence. The rotation of the driving member can drive the transmission gear to rotate, thereby driving the driving screw to rotate. The rotation of the driving screw can drive the connecting seat to move along the front and rear directions of the bottom shell.

According to the chassis structure provided by the embodiment of the first aspect of the utility model, a threaded member is provided in the middle of the connecting seat, and the driving screw is threadedly connected to the threaded member.

According to the chassis structure provided by the embodiment of the first aspect of the utility model, armrests are connected to both sides of the bottom shell, and the driving member extends to the armrest located on the right side of the chassis.

According to the chassis structure provided by the embodiment of the first aspect of the utility model, guide grooves are arranged on both sides of the bottom shell, and a pulley is arranged at the bottom end of the rear bracket, and the pulley is arranged in the guide groove.

The seat provided according to the embodiment of the second aspect of the utility model comprises the chassis structure as described in the embodiment of the first aspect of the utility model.

The chair provided in accordance with the embodiment of the second aspect of the utility model has at least the following beneficial effects: when the user sits on the base plate and leans against the rear bracket or the backrest connected to the back bracket, the rear bracket or the backrest connected to the back bracket can drive the front end of the base plate to be pressed down during the force rotation, and the downward pressure of the base plate can drive the linkage part to rotate, and the rotation of the linkage part can drive the connecting seat to make the connecting seat compress the telescopic rod and the elastic part, and the compression of the telescopic rod and the elastic part can provide a reaction force to support the human body. During the process of the user leaning back, the rear bracket or the backrest connected to the back bracket is synchronously linked with the base plate and can move with the backward leaning of the human body, thereby better supporting the buttocks and back of the human body, which is beneficial to improving user experience.

Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

Additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

FIG1 is an axonometric view of a chassis structure provided by an embodiment of the first aspect of the utility model;

FIG2 is an axonometric view of the chassis structure provided by the embodiment of the first aspect of the utility model from another angle;

FIG3 is a schematic structural diagram of the outer portion of the bottom shell of the chassis structure provided by an embodiment of the first aspect of the utility model;

FIG4 is a schematic diagram of the structure inside the bottom shell of the chassis structure provided by the embodiment of the first aspect of the utility model;

5 is a schematic structural diagram of a tension adjustment device for a chassis structure provided by an embodiment of the first aspect of the utility model;

6 is a schematic structural diagram of an elastic linkage assembly of a chassis structure provided by an embodiment of the first aspect of the utility model;

FIG7 is an enlarged schematic diagram of point A in FIG6 ;

FIG8 is a schematic structural diagram of an elastic linkage assembly at a style angle of a chassis structure provided by an embodiment of the first aspect of the utility model;

FIG9 is a schematic structural diagram of a wire control assembly of a chassis structure provided by an embodiment of the first aspect of the utility model;

FIG10 is an enlarged schematic diagram of point B in FIG9 ;

FIG. 11 is a schematic structural diagram of a locking seat of a chassis structure provided in an embodiment of the first aspect of the present utility model.

The figures are as follows:

Bottom shell 100; bottom plate 110; mounting box 111; rear bracket 120; telescopic rod 130; connecting seat 140; threaded member 141; elastic member 150; shift member 160; shift slot 161; control plate 170; wire seat 180; first pull wire 190; locking member 200; locking seat 210; buckling boss 211; first slide slot 212; second slide slot 213; buckling slot 214; reset member 220; second pull wire 230; driving member 240; transmission rod 250; transmission gear 260; driving screw 270; handrail 280; guide slot 290; linkage member 300.

DETAILED DESCRIPTION

The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

In the description of the utility model, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

The structure of an existing seat includes a seat cushion, a backrest, armrests and a lumbar support. The seat cushion can provide support for the entire buttocks of the human body. The design of the seat cushion is closely related to the riding comfort of the user. However, in the related art, the seat cushion of some chairs is fixed on the chair and cannot support the user's buttocks as the user leans back, affecting the user's experience.

To solve this problem, the first aspect of the embodiment of the utility model provides a chassis structure. When the user leans back, the rear bracket 120 or the backrest connected to the back bracket is synchronously linked with the base plate 110 and can move with the backward movement of the human body, thereby better supporting the buttocks and back of the human body, which is beneficial to improving the user experience. The specific structure and function of the chassis structure provided by the embodiment of the utility model will be further explained below with reference to text and drawings.

1 to 5, the chassis structure provided according to the first embodiment of the utility model includes: a supporting device, the supporting device includes a bottom shell 100, a bottom plate 110, a rear bracket 120 and an elastic linkage component, the elastic linkage component is arranged in the bottom shell 100, the front end of the bottom plate 110 is connected to the elastic linkage component, the bottom end of the rear bracket 120 is movably connected to the bottom shell 100, and the middle part is rotatably connected to the rear end of the bottom plate 110; the elastic linkage component includes a plurality of telescopic rods 130, a connecting seat 140 and a linkage member 300 connected to the bottom plate 110, the outer periphery of each telescopic rod 130 is sleeved with an elastic member 150, and a plurality of The telescopic rods 130 are arranged side by side along the front-to-back direction of the bottom shell 100, the rear end of the telescopic rods 130 is hinged to the bottom shell 100, the front end is connected to the connecting seat 140, the linkage member 300 is rotatably connected to the front end of the bottom shell 100, and the connecting seat 140 is connected to the linkage member 300; wherein, by rotating the rear bracket 120, due to the rear connection between the middle part of the rear bracket 120 and the bottom plate 110, the rear bracket 120 can simultaneously drive the bottom plate 110 to move when it rotates, the bottom plate 110 can drive the linkage member 300 to rotate, and the rotation of the linkage member 300 can drive the connecting seat 140 so that the connecting seat 140 compresses the telescopic rod 130 and the elastic member 150.

The chassis structure provided by the embodiment of the first aspect of the utility model is applied to the seat, and the rear bracket 120 serves as a backrest or the rear bracket 120 is connected to the backrest. When the user sits on the base plate 110 and leans against the rear bracket 120 or the backrest connected to the back bracket, the rear bracket 120 or the backrest connected to the back bracket can drive the front end of the base plate 110 to be pressed down during the force rotation. The downward pressure of the base plate 110 can drive the linkage member 300 to rotate. The rotation of the linkage member 300 can drive the connecting seat 140 to make the connecting seat 140 compress the telescopic rod 130 and the elastic member 150. The compression of the telescopic rod 130 and the elastic member 150 can provide a reaction force to support the human body. During the process of the user leaning back, the rear bracket 120 or the backrest connected to the back bracket is synchronously linked with the base plate 110 and can move with the backward leaning of the human body, thereby better supporting the buttocks and back of the human body, which is beneficial to improving the user experience.

It should be noted that the number of the telescopic rods 130 can be three, four or five, etc., which is not specifically limited here; the elastic member 150 sleeved on the outer periphery of the telescopic rod 130 can be a spring, an elastic sleeve, etc., which is not limited here.

6 to 9, according to the chassis structure provided by the embodiment of the first aspect of the utility model, it also includes a control device, the control device includes a wire control assembly, a gear member 160 and a control piece 170, the lower side of the connecting seat 140 is provided with a mounting groove, the control piece 170 is arranged in the mounting groove and can rotate, the gear member 160 is arranged at the front end of the bottom shell 100 and is located at the lower side of the linkage member 300, the gear member 160 is provided with a plurality of gear slots 161 on one side facing the connecting seat 140, and the plurality of gear slots 161 are arranged at intervals along the rotation direction of the bottom plate 110, the wire control assembly can pull the control piece 170 to make the control piece 170 enter or leave the gear slot 161, and the control piece 170 can make the rear bracket 120 be located at different inclinations when in different gear slots 161, and make the bottom plate 110 be at different inclinations, so that the user can adjust the sitting posture conveniently. And through the control of the wire control assembly, it is convenient for the user to operate, which is conducive to improving the user experience.

6 to 11, according to the chassis structure provided by the embodiment of the first aspect of the utility model, the wire control assembly includes a wire seat 180, a first pull wire 190, a locking member 200, a locking seat 210, a reset member 220 and a second pull wire 230, the wire seat 180 is slidably connected to the bottom plate 110, a buckle boss 211 is provided in the middle of the locking seat 210, and a first slide groove 212 and a second slide groove 213 connected end to end are provided on the periphery of the buckle boss 211, and the buckle boss 211 is provided with a first slide groove 212 and a second slide groove 213 connected end to end. The buckle groove 214 is connected to the groove 212 and the second slide groove 213. One end of the locking member 200 is fixed to the wire seat 180, and the other end is located in the first slide groove 212. One end of the reset member 220 is connected to the locking seat 210, and the other end is connected to the wire seat 180. The end of the first pull wire 190 is connected to the wire seat 180. One end of the second pull wire 230 is connected to the control piece 170, and the other end is connected to the wire seat 180. When the first pull wire 190 is pulled to drive the wire seat 180 to slide, the end of the locking member 200 can The first pull line 190 is pulled again, and the lock member 200 is locked in the buckle groove 214. The second pull line 230 can pull the control plate 170 to keep the control plate 170 separated from the gear slot 161. At this time, when the user is leaning back, the rear bracket 120 or the backrest connected to the back bracket is synchronously linked with the bottom plate 110, and can perform synchronous actions with the back leaning of the human body, which is beneficial to support the user's buttocks. The end of the fixed member 200 is separated from the buckle groove 214, the end of the locking member 200 is separated from the buckle groove 214, the reset member 220 drives the locking member 200 to reset, and the locking member 200 can slide along the second slide groove 213 to return to the first slide groove 212, and the second pull wire 230 can pull the control plate 170 to make the control plate 170 snap into the gear groove 161. At this time, the rear bracket 120 or the backrest and the bottom plate 110 connected to the back bracket are locked in a certain gear to facilitate the user to maintain a comfortable sitting posture.

According to the chassis structure provided in the embodiment of the first aspect of the utility model, an installation box 111 is arranged at the top of the bottom plate 110, and the wire seat 180, the locking member 200, the locking seat 210 and the reset member 220 are all arranged in the installation box 111, which can prevent the wire seat 180, the locking member 200, the locking seat 210 and the reset member 220 from being damaged due to collision and the like during use, and can also improve the compactness of the structure.

9 and 10 , according to the chassis structure provided in the embodiment of the first aspect of the utility model, a slide rail is provided at the bottom of the mounting box 111, and a slide groove cooperating with the slide rail is provided at the bottom of the wire seat 180. The slide rail is inserted into the slide groove, and the wire seat 180 can slide on the slide rail of the mounting seat, which is beneficial to improving the reliability of the wire control assembly.

3 to 5 , the chassis structure provided in accordance with the embodiment of the first aspect of the present invention further includes a tension adjustment device, which includes a driving member 240, a transmission rod 250, a transmission gear 260 and a driving screw 270. The driving screw 270 is threadedly connected to the connecting seat 140. The driving member 240, the transmission rod 250 and the transmission gear 260 are arranged on the bottom shell 100 and are connected in sequence. The rotation of the driving member 240 can drive the transmission gear 260 to rotate, thereby driving the driving screw 270 to rotate. The rotation of the driving screw 270 can drive the connecting seat 140 to move along the front-to-back direction of the bottom shell 100, thereby compressing the telescopic rod 130 and the elastic member 150, adjusting the tension of the telescopic rod 130 and the elastic member 150, and realizing the adjustment of the reclining tension.

5 , according to the chassis structure provided by the embodiment of the first aspect of the utility model, a threaded member 141 is provided in the middle of the connecting seat 140, the driving screw 270 is threadedly connected to the threaded member 141, and the connection method and transmission method between the tension adjustment device and the connecting seat 140 are stable and reliable.

1 to 4 , according to the chassis structure provided by the first embodiment of the utility model, armrests 280 are connected to both sides of the bottom shell 100, and the driving member 240 extends to the armrest 280 located on the right side of the chassis, so that the user can adjust it at any time during use.

1 to 4 , according to the chassis structure provided by the embodiment of the first aspect of the utility model, guide grooves 290 are provided on both sides of the bottom shell 100, and a pulley is provided at the bottom end of the rear bracket 120. The pulley is arranged in the guide groove 290. When the user leans back against the rear bracket 120, the rear bracket 120 slides smoothly, which is beneficial to improving the user experience.

The seat provided according to the embodiment of the second aspect of the utility model includes the chassis structure of the embodiment of the first aspect of the utility model.

According to the chair provided by the embodiment of the second aspect of the utility model, when the user sits on the base plate 110 and leans against the rear bracket 120 or the backrest connected to the back bracket, the rear bracket 120 or the backrest connected to the back bracket can drive the front end of the base plate 110 to be pressed down during the force rotation process, and the downward pressure of the base plate 110 can drive the linkage member 300 to rotate, and the rotation of the linkage member 300 can drive the connecting seat 140 to make the connecting seat 140 compress the telescopic rod 130 and the elastic member 150, and the compression of the telescopic rod 130 and the elastic member 150 can provide a reaction force to support the human body. During the process of the user leaning back, the rear bracket 120 or the backrest connected to the back bracket is synchronously linked with the base plate 110 and can move with the backward leaning of the human body, so as to better support the buttocks and back of the human body, which is beneficial to improving the user experience.

The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. The above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit it. The present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims (10)

1. A chassis structure, comprising:

The support device comprises a bottom shell, a bottom plate, a rear support and an elastic linkage assembly, wherein the elastic linkage assembly is arranged in the bottom shell, the front end of the bottom plate is connected with the elastic linkage assembly, the bottom end of the rear support is movably connected with the bottom shell, and the middle part of the rear support is rotatably connected with the rear end of the bottom plate;

The elastic linkage assembly comprises a plurality of telescopic rods, connecting seats and linkage pieces connected with the bottom plate, wherein an elastic piece is sleeved outside Zhou Jun of each telescopic rod, the telescopic rods are arranged side by side along the front-back direction of the bottom shell, the rear ends of the telescopic rods are hinged to the bottom shell, the front ends of the telescopic rods are connected with the connecting seats, the linkage pieces are rotatably connected to the front ends of the bottom shell, and the connecting seats are connected with the linkage pieces;

The rear support can drive the bottom plate, the bottom plate can drive the linkage piece to rotate, and the linkage piece can drive the connecting seat to enable the connecting seat to compress the telescopic rod and the elastic piece.

2. The chassis structure according to claim 1, further comprising a control device including a drive-by-wire assembly, a gear piece, and a control piece, wherein a mounting groove is provided on a lower side of the connection base, the control piece is provided in the mounting groove and is rotatable, the gear piece is provided at a front end of the bottom case, a plurality of gear grooves are provided on a side of the gear piece facing the connection base, the plurality of gear grooves are arranged at intervals along a rotation direction of the bottom plate, and the drive-by-wire assembly is capable of pulling the control piece to enable the control piece to enter or leave the gear grooves.

3. The chassis structure according to claim 2, wherein the wire control assembly comprises a wire seat, a first pull wire, a locking piece, a locking seat, a reset piece and a second pull wire, the wire seat is slidably connected to the bottom plate, a buckling boss is arranged in the middle of the locking seat, a first sliding groove and a second sliding groove which are connected end to end are arranged on the periphery of the buckling boss, a buckling groove which is communicated with the first sliding groove and the second sliding groove is formed in the buckling boss, one end of the locking piece is fixed to the wire seat, the other end of the locking piece is located in the first sliding groove, one end of the reset piece is connected to the locking seat, the other end of the reset piece is connected to the wire seat, one end of the second pull wire is connected to the control piece, the other end of the second pull wire is connected to the wire seat, when the first pull wire is pulled to drive the wire seat to slide, the end of the locking piece can be clamped into the buckling groove along the first sliding groove, and the end of the locking piece can be pulled into the buckling groove along the first sliding groove, and the end of the locking piece can be separated from the first sliding groove; when the first stay wire is pulled again, the end part of the locking piece is separated from the buckling groove, the resetting piece drives the locking piece to reset, the locking piece can slide along the second sliding groove to return to the first sliding groove, and the second stay wire can pull the control piece to enable the control piece to be clamped into the gear groove.

4. A chassis arrangement according to claim 3, wherein the base plate is provided with a mounting box, and the wire holder, the locking member, the locking holder and the reset member are all provided in the mounting box.

5. The chassis structure of claim 4, wherein a sliding rail is provided at the bottom of the mounting box, a sliding groove matched with the sliding rail is provided at the bottom of the wire seat, and the sliding rail is clamped into the sliding groove.

6. The chassis structure according to claim 1, further comprising a slack adjuster, wherein the slack adjuster includes a driving member, a driving rod, a driving gear, and a driving screw, the driving screw is screwed with the connection base, the driving member, the driving rod, and the driving gear are disposed on the bottom shell and are sequentially connected, the driving member rotates to drive the driving gear to rotate, thereby driving the driving screw to rotate, and the driving screw rotates to drive the connection base to move along a front-rear direction of the bottom shell.

7. The chassis structure according to claim 6, wherein a screw is provided at a middle portion of the connection base, and the driving screw is screw-coupled with the screw.

8. The chassis structure of claim 6, wherein the bottom case has armrests connected to both sides thereof, and the driving member extends to the armrests located on the right side of the chassis.

9. The chassis structure according to claim 1, wherein guide grooves are provided on both sides of the bottom chassis, and pulleys are provided at the bottom ends of the rear brackets, the pulleys being provided in the guide grooves.

10. A seat comprising a chassis structure according to any one of claims 1 to 9.