Seat and chassis arrangement thereof

Abstract

The utility model provides a kind of seat and its chassis device, wherein, the chassis device includes: support frame, the support frame includes first bottom plate, cover plate and two first side plates;Tailstock, the tailstock bag second bottom plate, second side plate, third side plate, connecting part and multiple limit holes;Fixed frame, the fixed frame includes fixed plate baffle;Hydraulic ram;Control structure, the control structure includes by control lever, sleeve, press set portion and elastic component;The press set portion is butted to the end face of the pressing end;Limiting structure, the limiting structure includes gear pin, sliding block, limiting portion, first elastic piece, second elastic piece and clamping groove;Elastic structure.The chassis device of the utility model can be associated together with control structure and limiting structure to form an integrated operation unit, to reduce the use of spare parts, to reduce the production cost of chassis device.

Description

Technical Field

[0001] This utility model relates to the field of seating technology, and in particular to a seat and its chassis device. Background Technology

[0002] A chair is a device used for users to sit and rest. It can be divided into office chairs, gaming chairs, executive chairs, and children's chairs, etc.

[0003] A seat mainly consists of support legs at the bottom, a chassis for adjusting the seat height and tilt angle, a seating area for the user to sit on, and a backrest for the user to lean against. The chassis, as the primary adjustment structure, plays a crucial role in the seat.

[0004] The chassis mainly includes a hydraulic rod mechanism for adjusting the height, a control structure for pressing the hydraulic rod mechanism to achieve seat height adjustment, a limiting structure for locking or unlocking the seat tilt angle, and a reset structure for elastically resetting the seat tilt angle, etc.

[0005] The chassis in the existing technology are of various types. The control structure belongs to a separate operating unit, while the limit structure belongs to another separate operating unit. The two operating units are not related, which leads to the chassis needing to use more parts to realize its adjustment function, ultimately resulting in excessively high chassis production costs. Utility Model Content

[0006] In view of the shortcomings of the prior art, this utility model proposes a seat and its chassis device to solve the problem of excessively high chassis production costs in the prior art.

[0007] In a first aspect, this utility model provides a chassis device, which includes:

[0008] The support frame includes a first annular base plate, a cover plate covering the first base plate and having a receiving space, and two first side plates formed by bending and extending from opposite sides of the first base plate; the two first side plates are respectively spaced apart from the corresponding side of the cover plate to form a receiving gap.

[0009] The tail frame includes a second base plate, a second side plate and a third side plate formed by bending and extending from opposite sides of the second base plate, a connecting portion connecting the second side plate and the third side plate, and a plurality of limiting holes arranged at intervals through the second side plate away from the second base plate; the second base plate and the connecting portion are respectively spaced apart from the support frame; both the second side plate and the third side plate extend towards the support frame and are respectively hinged to two first side plates; the middle region of the side of the second side plate away from the second base plate gradually slopes towards the end of the second side plate closer to the support frame; the middle region of the side of the second side plate away from the second base plate is further away from the second base plate than the end of the second side plate closer to the support frame.

[0010] A fixing frame is housed and fixed within the receiving space; the fixing frame includes a fixing plate fixed to the cover plate and a baffle formed by bending and extending the fixing plate from one end near the second side plate away from the cover plate; the baffle is parallel to the second side plate and the third side plate;

[0011] A hydraulic rod, the pressing end of which passes sequentially through the cover plate and the fixing plate and extends to the side of the fixing plate away from the cover plate;

[0012] The control structure includes a control lever extending from the side of the support frame away from the baffle, sequentially passing through the first side plate and the cover plate and extending to form a rotatable connection with the baffle; a sleeve sleeved and fixed to the control lever and located within the receiving space; a pressing portion protruding from one end of the sleeve near the pressing end and extending towards the pressing end; and an elastic component forming an elastic connection with the fixed plate; the pressing portion abuts against the end face of the pressing end.

[0013] The limiting structure includes a stop pin extending from one side of the support frame to the other side and slidably connected to the support frame; a sliding block sleeved and fixed to the stop pin and located within the receiving space; a limiting portion extending from one end of the sliding block near the third side plate towards the pressing end; a first elastic member sleeved on the stop pin and with both ends abutting the inner circumference of the cover plate and the end of the sliding block near the second side plate; a second elastic member sleeved on the stop pin and with both ends abutting the end of the sliding block near the third side plate and the inner circumference of the cover plate; and a groove formed by the stop pin recessed inward from a position away from the baffle. One end face of the side plate is on the same plane as the outer surface of the first side plate near the second side plate. The stop pin abuts against the side of the second side plate away from the second bottom plate. The end of the stop pin near the third side plate is rectangular and abuts against the side of the third side plate away from the second bottom plate. The end of the limiting portion away from the third side plate abuts against the end of the pressing portion near the third side plate. The opening direction of the slot faces the third side plate. The extended end of the third side plate extends towards the support frame beyond the limiting axis near the third side plate and is at most on the same plane as the bottom of the slot. A plurality of limiting holes are arranged relative to the stop pin on the path of rotation of the support frame relative to the tailstock.

[0014] An elastic structure, one end of which passes through the connecting portion and extends to the first base plate and abuts against the side of the first base plate away from the second base plate, and the other end of the elastic structure abuts against the second base plate to limit the movement of the elastic structure toward the support frame.

[0015] Preferably, the support frame further includes a rivet extending from one of the first side plates to the other first side plate; the second side plate and the third side plate are fitted onto the rivet to be respectively hinged within the two receiving gaps.

[0016] Preferably, the fixing plate is annular; the fixing frame further includes a sleeve portion that protrudes from the inner periphery of the fixing plate toward the hydraulic rod and passes through the cover plate and is sleeved on the hydraulic rod.

[0017] Preferably, the control lever includes a through section that passes through the two first side plates respectively, a bent section that extends from one end of the through section, an extension section that extends from the end of the bent section away from the through section in a direction away from the base plate, and a handle portion sleeved on the end of the extension section away from the bent section; the pressing portion is disposed in the through section.

[0018] Preferably, the end face of the pressing end of the hydraulic rod is an arc end face; the pressing part is provided with a protrusion extending towards the end face of the pressing end on the side near the pressing end, and the two opposite sides of the protrusion along the direction from one of the first side plates to the other first side plate are respectively arc surfaces that are connected to each other and match the end face of the pressing end.

[0019] Preferably, the elastic component includes a positioning portion protruding from the side of the sleeve away from the pressing end, a groove formed by the positioning portion recessed inward from the side of the positioning portion near the baffle, a through hole penetrating the opposite side walls of the groove, an abutting portion abutting against the fixing plate, a buckle extending from the opposite sides of the abutting portion toward the groove and engaging in the corresponding through hole, and a third elastic member penetrating the groove and abutting against the abutting portion.

[0020] Preferably, the elastic structure is inclined, and one end of the elastic structure fixed to the first base plate is further away from the support frame than the end of the elastic structure that is farther away from the first base plate. The end of the elastic structure that is farther away from the first base plate abuts against the side of the second base plate that is closer to the support frame.

[0021] Preferably, the elastic structure includes a screw clamp abutting against the first base plate, an adjusting screw that passes through the first base plate and the connecting portion in sequence and extends to be connected to the screw clamp, and a fourth elastic element sleeved on the adjusting screw and having its two ends abutting against the connecting portion and the screw clamp respectively.

[0022] Preferably, the first base plate has fixing holes at its four corners.

[0023] Secondly, this utility model provides a seat that includes the chassis assembly described above.

[0024] Compared with the prior art, the chassis device of this utility model is designed with a support frame, tail frame, fixed frame, hydraulic rod, control structure, limiting structure and elastic structure, and the pressing part of the control structure abuts against the end face of the pressing end, and the limiting part of the limiting structure abuts against the pressing part. In this way, the control structure and the limiting structure of the chassis device can be linked together to form an integrated operating unit, thereby reducing the use of parts and reducing the production cost of the chassis device. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0026] Figure 1 A three-dimensional structural diagram of the chassis device provided in the embodiment of this utility model;

[0027] Figure 2 An exploded view of the chassis device provided in this embodiment of the utility model;

[0028] Figure 3 An exploded view of the chassis device for removing rivets provided in this embodiment of the utility model;

[0029] Figure 4 An exploded view of the control structure in the chassis device provided in this embodiment of the utility model.

[0030] Among them, 100, chassis device; 1, support frame; 11, first base plate; 111, fixing hole; 12, cover plate; 13, first side plate; 14, rivet; 2, tail frame; 21, second base plate; 22, second side plate; 23, third side plate; 24, connecting part; 25, limiting hole; 3, fixing frame; 31, fixing plate; 32, baffle; 33, sleeve part; 4, hydraulic rod; 41, pressing end; 5, control structure; 51, control lever; 511, through section; 512, bending section; 513, extension 514. Extension section; 52. Handle; 53. Sleeve; 54. Pressing part; 55. Protrusion; 56. Elastic component; 57. Positioning part; 58. Groove; 59. Perforation; 50. Abutment part; 51. Buckle; 52. Third elastic element; 63. Limiting structure; 64. Stop pin; 65. Sliding block; 66. Limiting part; 67. First elastic element; 68. Second elastic element; 69. Slot; 70. Elastic structure; 71. Screw clamp; 72. Adjusting screw; 73. Fourth elastic element. Detailed Implementation

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application, are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0032] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0033] It should be noted that the terms "above," "below," "left," and "right" mentioned in the embodiments of this utility model are used to describe the placement state in the accompanying drawings and should not be interpreted as limiting embodiments of this utility model. Furthermore, it should be understood that, in the text, when referring to an element that constitutes "above" or "below" another element, it is possible that the element directly constitutes "above" or "below" the other element, or it is possible that the element constitutes "above" or "below" the other element through an intermediate element.

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] Example 1

[0036] This utility model embodiment provides a chassis device 100, combined with... Figures 1 to 4 As shown, it includes a support frame 1, a tail frame 2, a fixing frame 3, a hydraulic rod 4, a control structure 5, a limiting structure 6, and a spring structure 7.

[0037] The chassis device 100 serves as a connecting structure between the seat legs and the seating area, and also has the function of adjusting the seat height and the tilt angle of the backrest; the hydraulic rod 4 is fixed to the seat legs, and the support frame 1 is connected to the seating area to support the seating area.

[0038] The support frame 1 includes a first annular base plate 11, a cover plate 12 covering the first base plate 11 and having a receiving space, and two first side plates 13 formed by bending and extending from opposite sides of the first base plate 11; the two first side plates 13 are spaced apart from the corresponding sides of the cover plate 12 to form receiving gaps. The receiving space of the cover plate 12 has an opening, and the opening is aligned with the hollow portion of the first base plate 11; the first side plates 13 extend from opposite sides of the first base plate 11 toward the fixing frame 3.

[0039] The first base plate 11 has four fixing holes 111 at its four corners. The seating part is fixed to the first base plate 11 by fasteners passing through the fixing holes 111. The fasteners can be screws or bolts.

[0040] The tail frame 2 includes a second base plate 21, a second side plate 22 and a third side plate 23 formed by bending and extending the opposite sides of the second base plate 21, a connecting part 24 connecting the second side plate 22 and the third side plate 23, and a plurality of limiting holes 25 that pass through the second side plate 22 away from the second base plate 21 and are arranged at intervals. The second base plate 21 and the connecting part 24 are respectively spaced apart from the support frame 1. The second side plate 22 and the third side plate 23 both extend towards the support frame 1 and are respectively hinged to the two first side plates 13. The middle area of ​​the side of the second side plate 22 away from the second base plate 21 gradually tilts towards the end of the second side plate 22 closer to the support frame 1. The middle area of ​​the side of the second side plate 22 away from the second base plate 21 is further away from the second base plate 21 than the end of the second side plate 22 closer to the support frame 1.

[0041] The support frame 1 also includes a rivet 14 that passes through one of the first side plates 13 to the other first side plate 13; the second side plate 22 and the third side plate 23 are fitted onto the rivet 14 to be hinged in the two receiving gaps respectively. This design can more stably hinge the second side plate 22 and the third side plate 23 in the two receiving gaps.

[0042] The fixing frame 3 is housed and fixed within the receiving space; the fixing frame 3 includes a fixing plate 31 fixed to the cover plate 12 and a baffle 32 formed by bending and extending the fixing plate 31 from one end near the second side plate 22 away from the cover plate 12; the baffle 32 is parallel to the second side plate 22 and the third side plate 23.

[0043] The fixing plate 31 is annular; the fixing bracket 3 also includes a fitting part 33 that protrudes from the inner periphery of the fixing plate 31 toward the hydraulic rod 4 and passes through the cover plate 12 and is fitted onto the hydraulic rod 4. This design can improve the stability of the hydraulic rod 4 after it is connected to the fixing plate 31.

[0044] The pressing end 41 of the hydraulic rod 4 passes through the cover plate 12 and the fixing plate 31 in sequence and extends to the side of the fixing plate 31 away from the cover plate 12. The hydraulic rod 4 is used in conjunction with the hydraulic cylinder so that the lifting effect can be achieved by pressing its pressing end 41.

[0045] The control structure 5 includes a control lever 51 that extends from the side of the support frame away from the baffle 32, passing through the first side plate 13 and the cover plate 12 and forming a rotatable connection with the baffle 32; a sleeve 52 that is sleeved and fixed to the control lever 51 and located in the receiving space; a pressing part 53 that protrudes from one end of the sleeve 52 near the pressing end 41 and extends towards the pressing end 41; and an elastic component 54 that forms an elastic connection with the fixing plate 31. The pressing part 53 abuts against the end face of the pressing end 41, and the third side plate 23 is provided with a groove to avoid the control lever 51 at the position corresponding to the control lever 51.

[0046] The control lever 51 includes a through section 511 that passes through the two first side plates 13 respectively, a bent section 512 that extends from one end of the through section 511, an extension section 513 that extends from the end of the bent section 512 away from the through section 511 in a direction away from the base plate, and a handle portion 514 that is fitted onto the end of the extension section 513 away from the bent section 512; a pressing part 53 is provided in the through section 511. This design allows for easy rotation of the control lever 51 with relatively small force, and the handle portion 514 is designed for easy gripping by the user.

[0047] The limiting structure 6 includes a stop pin 61 extending from one side of the support frame 1 to the other side of the support frame 1 and forming a slidable connection with the support frame 1; a sliding block 62 sleeved and fixed to the stop pin 61 and located in the receiving space; a limiting part 63 extending from one end of the sliding block 62 near the third side plate 23 towards the pressing end 41; a first elastic member 64 sleeved on the stop pin 61 with both ends abutting against the inner circumference of the cover plate 12 and the end of the sliding block 62 near the second side plate 22; a second elastic member 65 sleeved on the stop pin 61 with both ends abutting against the end of the sliding block 62 near the third side plate 23 and the inner circumference of the cover plate 12; and a groove 66 formed by the stop pin 61 recessed inward from a position away from the baffle 32; the end face of the stop pin 61 near the second side plate 22 and the first elastic member near the second side plate 22 are connected. The outer surfaces of plate 13 are on the same plane. The stop pin 61 abuts against the side of the second side plate 22 away from the second bottom plate 21. The end of the stop pin 61 near the third side plate 23 is rectangular and abuts against the side of the third side plate 23 away from the second bottom plate 21. The end of the limiting part 63 away from the third side plate 23 abuts against the end of the pressing part 53 near the third side plate 23. The opening direction of the slot 66 faces the third side plate 23. The extension end of the third side plate 23 extends towards the support frame 1 to the side of the third side plate 23 that is closer to the limiting axis and is at most on the same plane as the bottom of the slot 66. Multiple limiting holes 25 are arranged relative to the stop pin 61 on the path of the support frame 1 rotating relative to the tail frame 2. The sliding distance of the stop pin 61 is equal to or greater than the distance from the outer surface of the first side plate 13 near the second side plate 22 to the inner surface of the second side plate 22.

[0048] One end of the elastic structure 7 passes through the connecting part 24 and extends to the first base plate 11, and abuts against the side of the first base plate 11 away from the second base plate 21. The other end of the elastic structure 7 abuts against the second base plate 21 to limit the movement of the elastic structure 7 toward the support frame 1.

[0049] The elastic structure 7 is inclined, and the end of the elastic structure 7 fixed to the first base plate 11 is further away from the support frame 1 than the end of the elastic structure 7 that is farther away from the first base plate 11. The end of the elastic structure 7 that is farther away from the first base plate 11 abuts against the side of the second base plate 21 that is closer to the support frame 1. This arrangement allows the elastic structure 7 to abut against the second base plate 21 better without affecting the arrangement of other components.

[0050] The elastic structure 7 includes a screw clamp 71 abutting against the first base plate 11, an adjusting screw 72 passing sequentially through the first base plate 11 and the connecting part 24 and extending to be connected to the screw clamp 71, and a fourth elastic member 73 sleeved on the adjusting screw 72 with its two ends abutting against the connecting part 24 and the screw clamp 71 respectively. This design can provide better elastic recovery force for the elastic structure 7, and the structure is simple, which can reduce the production cost of the chassis device 100.

[0051] In this embodiment, when the chassis device 100 is applied to a seat and the seat needs to achieve height adjustment, the control lever 51 is rotated, and the sleeve 52 fitted on the control lever 51 rotates together with the control lever 51. At this time, the pressing part 53 on the sleeve 52 also rotates, thereby pressing the pressing end 41 on the hydraulic rod 4, and finally the height adjustment function of the seat is realized through the hydraulic rod 4. After the height adjustment is completed, the control lever 51 will be reset under the elastic force of the elastic component 54, that is, reset is realized under the elastic force of the third elastic element 546. In addition, the elasticity of the elastic component 54 can also limit the rotation angle of the control lever 51, so that it will not rotate excessively and cause the pressing part 53 and the limiting part 63 to fail to abut. When the seat height needs to be reset, it is only necessary to rotate the control lever 51 to make the pressing part 53 press the pressing end 41 of the hydraulic rod 4, and then press down with the user's weight to complete the reset of the seat height.

[0052] In this embodiment, when the chassis device 100 is applied to a seat and requires tilt angle adjustment, pulling the control lever 51 causes the limiting part 63, which abuts against the pressing part 53 of the control lever 51, to slide along the extension direction of the limiting lever, aligning the opening of the slot 66 with the third side plate 23. This allows the user to rotate the tailstock 2 relative to the rivet 14 by leaning back. At this time, because the central area of ​​the second side plate 22 on the side away from the second base plate 21 gradually tilts towards the end of the second side plate 22 closer to the support frame 1, and the shift pin 61 abuts against the side of the second side plate 22 away from the second base plate 21, it is equivalent to the tailstock 2 rotating and causing the shift pin 61 to move along the inclined surface of the second side plate 22. The seat slides, and the shift pin 61 passes through the cover plate 12. The support frame 1 will tilt under the action of the shift pin 61, thereby adjusting the tilt angle of the seat. After the tilt angle of the seat is adjusted, the control lever 51 is released. The control lever 51 will reset under the elastic force of the first elastic member 64 and the second elastic member 65, so that the slot 66 will not be aligned with the third side plate 23. The end of the shift pin 61 near the second side plate 22 will also be inserted into the corresponding limiting hole 25, thereby completing the limiting and locking of the tilt angle of the seat. In addition, when it is necessary to reset, the control lever 51 needs to be pulled and there should be no user sitting on the seat. In this way, the seat can be reset by the elastic action of the elastic structure 7.

[0053] The end face of the pressing end 41 of the hydraulic rod 4 is an arc-shaped end face; the pressing part 53 near the pressing end 41 has a protrusion 531 extending towards the end face of the pressing end 41. The two opposite sides of the protrusion 531 along the direction from one of the first side plates 13 to the other first side plate 13 are respectively arc-shaped surfaces that are connected to each other and match the end face of the pressing end 41. This design allows the pressing part 53 to have two arc-shaped surfaces that can match the arc-shaped end face of the pressing end 41 of the hydraulic rod 4, so that the pressing part 53 can accurately press the pressing end 41 of the hydraulic rod 4 whether the control lever 51 is not pulled or after it is pulled.

[0054] The elastic component 54 includes a positioning portion 541 protruding from the side of the sleeve 52 away from the pressing end 41, a groove 542 formed by the inward recess of the positioning portion 541 near the baffle 32, through holes 543 penetrating the opposite side walls of the groove 542, an abutting portion 544 abutting against the fixing plate 31, buckles 545 extending from the opposite sides of the abutting portion 544 toward the groove 542 and engaging in the corresponding through holes 543, and a third elastic member 546 penetrating into the groove 542 and abutting against the abutting portion 544. This design can increase the limiting effect of the elastic component 54, so that the control lever 51 will not rotate excessively, causing the pressing portion 53 and the limiting portion 63 to fail to abut.

[0055] The first elastic element 64, the second elastic element 65, the third elastic element 546, and the fourth elastic element 73 mentioned above are all springs. Of course, depending on actual needs, sheet metal or elastic silicone can also be selected.

[0056] Compared with the prior art, the chassis device 100 of this utility model is designed with a support frame 1, a tail frame 2, a fixing frame 3, a hydraulic rod 4, a control structure 5, a limiting structure 6, and an elastic structure 7. The pressing part 53 of the control structure 5 abuts against the end face of the pressing end 41, and the limiting part 63 of the limiting structure 6 abuts against the pressing part 53. In this way, the control structure 5 and the limiting structure 6 of the chassis device 100 can be linked together to form an integrated operating unit, thereby reducing the use of parts and reducing the production cost of the chassis device 100.

[0057] Example 2

[0058] This utility model embodiment provides a seat, which includes the chassis device 100 in Embodiment 1. Since the seat in this embodiment includes the chassis device 100 in Embodiment 1, it can also achieve the same technical effects as the chassis device 100 in Embodiment 1, which will not be described in detail here.

[0059] It should be noted that the various embodiments described above with reference to the accompanying drawings are only illustrative of the present invention and not intended to limit its scope. Those skilled in the art should understand that any modifications or equivalent substitutions made to the present invention without departing from its spirit and scope should be covered within the scope of the present invention. Furthermore, unless the context otherwise requires, singular terms include plural forms, and vice versa. Additionally, unless specifically stated otherwise, all or part of any embodiment may be used in conjunction with all or part of any other embodiment.

Claims

1. A chassis device, characterized in that, The chassis assembly includes: The support frame includes a first annular base plate, a cover plate covering the first base plate and having a receiving space, and two first side plates formed by bending and extending from opposite sides of the first base plate; the two first side plates are respectively spaced apart from the corresponding side of the cover plate to form a receiving gap. The tail frame includes a second base plate, a second side plate and a third side plate formed by bending and extending from opposite sides of the second base plate, a connecting portion connecting the second side plate and the third side plate, and a plurality of limiting holes arranged at intervals through the second side plate away from the second base plate; the second base plate and the connecting portion are respectively spaced apart from the support frame; both the second side plate and the third side plate extend towards the support frame and are respectively hinged to two first side plates; the middle region of the side of the second side plate away from the second base plate gradually slopes towards the end of the second side plate closer to the support frame; the middle region of the side of the second side plate away from the second base plate is further away from the second base plate than the end of the second side plate closer to the support frame. A fixing frame is housed and fixed within the receiving space; the fixing frame includes a fixing plate fixed to the cover plate and a baffle formed by bending and extending the fixing plate from one end near the second side plate away from the cover plate; the baffle is parallel to the second side plate and the third side plate; A hydraulic rod, the pressing end of which passes sequentially through the cover plate and the fixing plate and extends to the side of the fixing plate away from the cover plate; The control structure includes a control lever extending from the side of the support frame away from the baffle, sequentially passing through the first side plate and the cover plate and extending to form a rotatable connection with the baffle; a sleeve sleeved and fixed to the control lever and located within the receiving space; a pressing portion protruding from one end of the sleeve near the pressing end and extending towards the pressing end; and an elastic component forming an elastic connection with the fixed plate; the pressing portion abuts against the end face of the pressing end. The limiting structure includes a stop pin extending from one side of the support frame to the other side and slidably connected to the support frame; a sliding block sleeved and fixed to the stop pin and located within the receiving space; a limiting portion extending from one end of the sliding block near the third side plate towards the pressing end; a first elastic member sleeved on the stop pin and with both ends abutting the inner circumference of the cover plate and the end of the sliding block near the second side plate; a second elastic member sleeved on the stop pin and with both ends abutting the end of the sliding block near the third side plate and the inner circumference of the cover plate; and a groove formed by the stop pin recessed inward from a position away from the baffle. One end face of the side plate is on the same plane as the outer surface of the first side plate near the second side plate. The stop pin abuts against the side of the second side plate away from the second bottom plate. The end of the stop pin near the third side plate is rectangular and abuts against the side of the third side plate away from the second bottom plate. The end of the limiting portion away from the third side plate abuts against the end of the pressing portion near the third side plate. The opening direction of the slot faces the third side plate. The extended end of the third side plate extends towards the support frame beyond the limiting axis near the third side plate and is at most on the same plane as the bottom of the slot. A plurality of limiting holes are arranged relative to the stop pin on the path of rotation of the support frame relative to the tailstock. An elastic structure, one end of which passes through the connecting portion and extends to the first base plate and abuts against the side of the first base plate away from the second base plate, and the other end of the elastic structure abuts against the second base plate to limit the movement of the elastic structure toward the support frame.

2. The chassis device as described in claim 1, characterized in that, The support frame further includes a rivet extending from one of the first side plates to the other first side plate; the second side plate and the third side plate are fitted onto the rivet to be respectively hinged within the two receiving gaps.

3. The chassis device as described in claim 1, characterized in that, The fixing plate is annular; the fixing frame also includes a sleeve portion that protrudes from the inner periphery of the fixing plate toward the hydraulic rod and passes through the cover plate and is fitted onto the hydraulic rod.

4. The chassis device as described in claim 1, characterized in that, The control lever includes a through section that passes through the two first side plates respectively, a bent section that extends from one end of the through section, an extension section that extends from the end of the bent section away from the through section in a direction away from the base plate, and a handle portion sleeved on the extension section away from the end of the bent section; the pressing portion is provided in the through section.

5. The chassis device as described in claim 1, characterized in that, The end face of the pressing end of the hydraulic rod is an arc end face; the pressing part has a protrusion extending towards the end face of the pressing end on the side near the pressing end, and the two opposite sides of the protrusion along the direction from one of the first side plates to the other first side plate are arc surfaces that are connected to each other and match the end face of the pressing end.

6. The chassis device as described in claim 1, characterized in that, The elastic component includes a positioning portion protruding from the side of the sleeve away from the pressing end, a groove formed by the positioning portion recessed inward from the side of the baffle, a through hole penetrating the opposite side walls of the groove, an abutting portion abutting against the fixing plate, a buckle extending from the opposite sides of the abutting portion toward the groove and engaging in the corresponding through hole, and a third elastic element penetrating the groove and abutting against the abutting portion.

7. The chassis device as described in claim 1, characterized in that, The elastic structure is inclined, and one end of the elastic structure fixed to the first base plate is further away from the support frame than the end of the elastic structure that is farther away from the first base plate. The end of the elastic structure that is farther away from the first base plate abuts against the side of the second base plate that is closer to the support frame.

8. The chassis device as described in claim 7, characterized in that, The elastic structure includes a screw clamp abutting against the first base plate, an adjusting screw that passes through the first base plate and the connecting part in sequence and extends to be connected to the screw clamp, and a fourth elastic element sleeved on the adjusting screw and abutting against the connecting part and the screw clamp at both ends respectively.

9. The chassis device as described in claim 1, characterized in that, The first base plate has fixing holes at its four corners.

10. A type of seat, characterized in that, The seat includes the chassis assembly as described in any one of claims 1 to 9.

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