Seat and chassis arrangement thereof

Abstract

The utility model provides a kind of seat and its chassis device, wherein, chassis device includes: support frame, support frame includes first bottom plate and two first side plate components;Hydraulic rod, the pressing end of hydraulic rod passes through first bottom plate;Control structure, control structure includes control lever, sleeve, press set, first abutment, second abutment, recess and elastic member;Tailstock, tailstock bag second bottom plate, second side plate and third side plate, multiple limit hole and resist pressure part;Limit structure, limit structure includes sliding element, limit rod and bayonet slot;Elastic structure, one end of elastic structure is hinged to first bottom plate, the second end of elastic structure is fixed to second bottom plate.The chassis device of the utility model can be associated together with control structure and limit structure to form an integrated operation unit, thereby reducing the use of parts, to reduce the production cost of chassis device, while making control more simple.

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 an auxiliary tool used for users to sit and rest. Based on the direction of use, it can be divided into office chairs, gaming chairs, and children's chairs, etc.

[0003] A seat mainly consists of a support leg structure that rests on the ground to support the entire structure, a chassis structure for adjusting the seat height and tilt angle, a seating structure for the user to sit on, and a backrest structure for the user to lean against. The chassis structure, as the main adjustment structure of the seat, plays a crucial role.

[0004] The chassis structure mainly includes a hydraulic rod for adjusting the overall height of the seat, a control mechanism for pressing the hydraulic rod to control its lifting and lowering, a limiting mechanism for locking or unlocking the seat tilt angle, and an elastic mechanism for achieving elastic reset of the seat tilt angle, etc.

[0005] The existing chassis structures vary, with the control mechanism being a separate control mechanism and the limit structure being another separate control mechanism. The two mechanisms are independent of each other. This design requires the chassis structure to use more parts, which not only increases the cost of the chassis structure, but also makes operation more complicated due to the need for two separate controls. 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 problems that the existing base plate structure is not only too costly, but also cumbersome to operate.

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

[0008] A support frame, the support frame including a first base plate and two first side plate components formed by bending and extending from opposite sides of the first base plate;

[0009] A hydraulic rod, the pressing end of which passes through the bottom of the first base plate and extends between the two first side plate members;

[0010] The control structure is spaced apart from the first base plate. The control structure includes a control lever that passes sequentially through two first side plate members and is rotatably connected to each of the two first side plate members. The control lever includes a through section located between the two first side plate members and a grip section formed by bending one end of the through section and extending away from the first side plate members. The through section is also slidably connected to each of the two first side plate members. The control structure further includes a sleeve fitted and fixed to the through section and located between the two first side plate members, and a sleeve extending from the side of the sleeve near the pressing end towards the side of the pressing end. The sleeve comprises a pressing portion extending in a directional direction, a first abutting portion extending from a portion of the sleeve near the grip section in a direction close to the grip section, a second abutting portion extending from a portion of the sleeve away from the grip section in a direction away from the grip section, a groove formed by the inner recess of the second abutting portion, and an elastic member sleeved on the through section and received in the groove; the pressing portion abuts against the end face of the pressing end, the end of the first abutting portion away from the sleeve is spaced apart from the first side plate member near the grip section, and the two ends of the elastic member abut against the two opposite sidewalls of the groove;

[0011] 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 plurality of limiting holes arranged at intervals through a portion of the second side plate away from the second base plate, and a pressing portion formed by protruding from the side of the third side plate away from the second base plate in a direction away from the second base plate; the second base plate is spaced apart from the first base plate, and the second side plate and the third side plate extend to the outside of two corresponding first side plate members and are respectively hinged to one of the first side plate members;

[0012] A limiting structure is provided, spaced apart from the first base plate. The limiting structure includes a sliding member abutting against the through section and forming a slidable connection with the through section; a limiting rod sequentially penetrating two first side plate members and forming a fixed connection with the sliding member; and a bayonet groove formed by a recess in a portion of one side of the limiting rod. The two ends of the sliding member along the extension direction of the limiting rod abut against the two ends of the elastic member, and the sliding member is spaced apart from the sleeve. The distance between the sliding member and the sleeve is less than the distance from the end of the first abutting portion away from the sleeve to the first side plate member near the grip section. The limiting rod is spaced apart from the control lever, and the limiting rod is rectangular with one end near the pressing portion abutting against the pressing portion. One end of the limiting rod near the limiting hole is inserted into the limiting hole. The bayonet groove extends from one side of the limiting rod near the first base plate to the other side, and the opening direction of the bayonet groove faces the second base plate.

[0013] An elastic structure, one end of which is hinged to the first base plate, and the second end of which is fixed to the second base plate.

[0014] Preferably, each of the first side plate components includes a first vertical plate bent and extending from one side of the first base plate and perpendicular to the first base plate, a horizontal plate bent and extending from the side of the first vertical plate away from the first base plate and parallel to the first base plate, and a second vertical plate bent and extending from the side of the horizontal plate away from the first vertical plate and perpendicular to the first base plate, wherein the second vertical plate and the first vertical plate are spaced apart to form a receiving gap; the second side plate and the third side plate are respectively received within the receiving gap of the two first side plate components.

[0015] Preferably, each of the cross plates of the first side plate member is provided with a through mounting hole.

[0016] Preferably, the tailstock further includes a hinge shaft that passes sequentially through the second side plate, the third side plate, and the first vertical plate of the two first side plate components; the hinge shaft is fixedly connected to the second side plate and the third side plate respectively, and the hinge shaft is rotatably connected to the first vertical plate of the two first side plate components respectively.

[0017] Preferably, the first base plate has a baffle that bends and extends away from the first base plate on the side near the sleeve; the baffle extends above the sleeve and is positioned directly opposite the pressing end.

[0018] Preferably, the control lever further includes a handle sleeved and fixed to the end of the grip section away from the through section.

[0019] Preferably, the sliding member includes a sleeve portion that engages with the through section, a fixing portion formed by bending and extending the sleeve portion from the side near the limiting rod toward the limiting rod, and a limiting groove formed by recessing the fixing portion from the side near the first base plate; the limiting rod passes through the limiting groove and is fixedly connected to the fixing portion.

[0020] Preferably, the two opposite sides of the limiting groove protrude and extend to form buckles; the limiting rod is provided with a through groove corresponding to the position of the buckle; each buckle passes through the corresponding groove and abuts against the side of the limiting rod away from the fixing part.

[0021] Preferably, the elastic structure includes a helical spring, a limiting sleeve surrounding the helical spring, a first guide portion fixed to one end of the limiting sleeve and extending into the interior of one end of the helical spring, a second guide portion inserted into the interior of the other end of the helical spring and fixed to the second base plate, and a rotating shaft passing through the first guide portion; the first base plate has two protruding and spaced-apart clamping plates on the side away from the control structure, and the two ends of the rotating shaft are respectively inserted into the two clamping plates and form a rotatable connection.

[0022] Secondly, this utility model provides a seat that includes the chassis device described above.

[0023] Compared with the prior art, the chassis device of this utility model is designed with a support frame, hydraulic rod, control structure, tail frame, limiting structure and elastic structure. The pressing part of the control structure abuts against the end face of the pressing end, and the two ends of the sliding member in the limiting structure along the extension direction of the limiting rod abut against the two ends of the elastic member in the control structure. 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. At the same time, two adjustment modes can be realized with only one operation, making the operation simpler. Attached Figure Description

[0024] 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:

[0025] Figure 1 A three-dimensional structural diagram of the chassis device provided in the embodiment of this utility model;

[0026] Figure 2Partial exploded view of the chassis device provided in the embodiment of this utility model;

[0027] Figure 3 This is a schematic diagram of a portion of the structure of the chassis device provided in an embodiment of the present utility model, excluding hydraulic rods, control structures, and limiting structures;

[0028] Figure 4 An exploded view of the control structure and limiting structure in the chassis device provided in this embodiment of the utility model.

[0029] Among them, 100, chassis device; 1, support frame; 11, first base plate; 111, baffle; 112, clamping plate; 12, first side plate component; 121, first vertical plate; 122, horizontal plate; 1221, mounting hole; 123, second vertical plate; 2, hydraulic rod; 21, pressing end; 3, control structure; 31, control lever; 311, through section; 312, hand grip section; 313, handle; 32, sleeve; 33, pressing part; 331, protrusion; 34, first abutment part; 35, second abutment part; 36, concave part. 37. Groove; 4. Elastic element; 4. Tail frame; 41. Second base plate; 42. Second side plate; 43. Third side plate; 44. Limiting hole; 45. Pressing part; 46. Hinge shaft; 5. Limiting structure; 51. Sliding element; 511. Sleeve part; 512. Fixing part; 513. Limiting groove; 514. Buckle; 52. Limiting rod; 521. Snap groove; 53. Snap groove; 6. Elastic structure; 61. Helical spring; 62. Limiting sleeve; 63. First guide part; 64. Second guide part; 65. Rotating shaft; 10. Receiving gap. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] Example 1

[0035] This utility model embodiment provides a chassis device 100, combined with... Figures 1 to 4 As shown, it includes a support frame 1, a hydraulic rod 2, a control structure 31, a tail frame 4, a limiting structure 5, and a spring structure 6.

[0036] The chassis device 100 serves as a connecting structure between the support leg structure of the seat and the seating structure, and also has the function of adjusting the seat height and the tilt angle of the backrest structure; the hydraulic rod 2 is fixed to the seat leg, and the support frame 1 is connected to the seating structure to support the seating structure.

[0037] The support frame 1 includes a first base plate 11 and two first side plate members 12 formed by bending and extending the opposite sides of the first base plate 11.

[0038] The pressing end 21 of the hydraulic rod 2 passes through the bottom of the first base plate 11 and extends between the two first side plate members 12. The hydraulic rod 2 is used in conjunction with the hydraulic cylinder, and the lifting effect can be achieved by pressing its pressing end 21.

[0039] The control structure 31 is spaced apart from the first base plate 11. The control structure 31 includes a control lever 31 that passes through two first side plate members 12 and is rotatably connected to each of the two first side plate members 12. The control lever 31 includes a through section 311 located between the two first side plate members 12 and a grip section 312 formed by bending one end of the through section 311 and extending away from the first side plate member 12. The through section 311 is also slidably connected to each of the two first side plate members 12.

[0040] The control structure 31 also includes a sleeve 32 that is fitted and fixed to the through section 311 and located between the two first side plate members 12, a pressing part 33 that protrudes from the side of the sleeve 32 near the pressing end 21 toward the pressing end 21, a first abutting part 34 that protrudes from a portion of the sleeve 32 near the end of the grip section 312 toward the grip section 312, a second abutting part 35 that protrudes from a portion of the sleeve 32 away from the end of the grip section 312 toward the away from the grip section 312, a groove 36 formed by the indentation of the inner side of the second abutting part 35, and an elastic member 37 fitted into the through section 311 and received in the groove 36.

[0041] The pressing part 33 abuts against the end face of the pressing end 21, the end of the first abutting part 34 away from the sleeve 32 is spaced apart from the first side plate member 12 near the grip section 312, and the two ends of the elastic member 37 abut against the two opposite groove sidewalls of the groove 36 respectively.

[0042] The tail frame 4 includes a second base plate 41, a second side plate 42 and a third side plate 43 formed by bending and extending from opposite sides of the second base plate 41, a plurality of limiting holes 44 that pass through the second side plate 42 away from the second base plate 41 and are arranged at intervals, and a pressing part 45 formed by protruding from the side of the third side plate 43 away from the second base plate 41 in a direction away from the second base plate 41; the second base plate 41 is spaced apart from the first base plate 11, and the second side plate 42 and the third side plate 43 extend to the outside of the corresponding two first side plate members 12 and are respectively hinged to one of the first side plate members 12.

[0043] The limiting structure 5 is spaced apart from the first base plate 11; the limiting structure 5 includes a sliding member 51 that abuts against the through section 311 and forms a sliding connection with the through section 311, a limiting rod 52 that passes through the two first side plate members 12 in sequence and forms a fixed connection with the sliding member 51, and a bayonet groove 53 formed by a partial recess on one side of the limiting rod 52.

[0044] The two ends of the sliding member 51 along the extension direction of the limiting rod 52 respectively abut against the two ends of the elastic member 37. The sliding member 51 and the sleeve 32 are spaced apart. The distance between the sliding member 51 and the sleeve 32 is less than the distance between the end of the first abutting part 34 away from the sleeve 32 and the first side plate member 12 near the grip section 312. The limiting rod 52 and the control rod 31 are spaced apart. The limiting rod 52 is rectangular and abuts against the pressing part 45 at one end. The end of the limiting rod 52 near the limiting hole 44 is inserted into the limiting hole 44. The bayonet groove 53 also extends from the side of the limiting rod 52 near the first base plate to the other side. The opening direction of the bayonet groove 53 faces the second base plate 41.

[0045] One end of the elastic structure 6 is hinged to the first base plate 11, and the second end of the elastic structure 6 is fixed to the second base plate 41.

[0046] In this embodiment, when the chassis device 100 needs to adjust the height of the seat, the control lever 31 is rotated, and the sleeve 32 fitted on the through section 311 rotates with the control lever 31. At this time, the pressing part 33 extending from the sleeve 32 also rotates, thereby pressing the pressing end 21 on the hydraulic rod 2, and finally the height adjustment function of the seat is realized through the hydraulic rod 2. When the seat height needs to be reset, the control lever 31 is rotated to make the pressing part 33 press the pressing end 21 of the hydraulic rod 2, and then the user's weight is used to press down to complete the reset of the seat height.

[0047] In this embodiment, when the chassis device 100 needs to adjust the seat tilt angle, the control lever 31 is pulled. At this time, since the two ends of the elastic element 37 abut against the two ends of the groove 36 and the two ends of the sliding element 51 respectively, when the control lever 31 is pulled, the elastic element 37, when compressed to a certain degree, will pull the sliding element 51 along with it. Since the first abutting part 34 abuts against the first side plate member 12 to limit the pulling distance of the control lever 31, the limiting rod 52 will eventually disengage from the limiting hole 44 but will not disengage from the first vertical plate 121 of the first side plate member 12. Furthermore, the opening of the locking groove 53 will align with the pressing part 45, allowing the user to adjust the tailstock 4 by leaning back. Relative to the rotation of the support frame 1, the presence of the elastic structure 6 at this time will suppress the rotational force to a certain extent. After the tilt angle adjustment is completed, release the control lever 31. Under the elastic force of the elastic element 37, the control lever 31 and the limit rod 52 will reset. That is, the limit rod 52 will be inserted into the corresponding limit hole 44 under the action of the control lever 31, and the bayonet groove 53 will not be aligned with the pressing part 45. The limit rod 52 will also abut against the pressing part 45, thereby achieving double limit locking and ensuring the state after the tilt angle adjustment is completed. In addition, when it is necessary to reset, the control lever 31 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 6.

[0048] In this embodiment, as Figure 2 As shown, a baffle 111 is provided on the side of the first base plate near the sleeve 32, which is bent and extends away from the first base plate; the baffle 111 extends above the sleeve 32 and is positioned directly opposite the pressing end 21. This design can prevent parts from being ejected and injuring people when the hydraulic rod 2 explodes through the baffle 111.

[0049] like Figure 3As shown, each first side plate member 12 includes a first vertical plate 121 that extends from one side of the first base plate 11 and is perpendicular to the first base plate 11, a horizontal plate 122 that extends from the side of the first vertical plate 121 away from the first base plate 11 and is parallel to the first base plate 11, and a second vertical plate 123 that extends from the side of the horizontal plate 122 away from the first vertical plate 121 and is perpendicular to the first base plate 11. The second vertical plate 123 and the first vertical plate 121 are spaced apart to form a receiving gap 10. The second side plate 42 and the third side plate 43 are respectively received within the receiving gap 10 of the two first side plate members 12. This design can improve the structural strength of the first side plate member 12 and facilitate the installation of the second side plate 42 and the third side plate 43.

[0050] like Figure 3 As shown, each of the first side panel members 12 has a through mounting hole 1221 on its horizontal plate 122. This design allows the seating structure to be more stably mounted on the support frame 1 through the mounting hole 1221.

[0051] Combination Figure 2 and Figure 4 As shown, the end face of the pressing end 21 of the hydraulic rod 2 is an arc-shaped end face; the pressing part 33 has a protrusion 331 extending towards the end face of the pressing end 21 on the side near the pressing end 21. The two opposite sides of the protrusion 331 along the direction from one of the first side plates to the other first side plate are arc-shaped surfaces that are connected to each other and match the end face of the pressing end 21. This design allows the pressing part 33 to have two arc-shaped surfaces that can match the arc-shaped end face of the pressing end 21 of the hydraulic rod 2, so that the pressing part 33 can accurately press the pressing end 21 of the hydraulic rod 2 whether the control lever 31 is not pulled or after it is pulled.

[0052] The joystick 31 also includes a handle 313 that is sleeved and fixed to the end of the grip section 312 away from the through section 311. This design makes it convenient for the user to operate the joystick 31.

[0053] The elastic element 37 is a spring. Of course, depending on the actual needs, a spring sheet or an elastic silicone sleeve can also be selected.

[0054] like Figure 2 As shown, the tailstock 4 also includes a hinge shaft 46 that passes sequentially through the second side plate 42, the third side plate 43, and the first vertical plate 121 of the two first side plate components 12. The hinge shaft 46 is fixedly connected to the second side plate 42 and the third side plate 43, and rotatably connected to the first vertical plate 121 of the two first side plate components 12. This design allows the tailstock 4 to be easily hinged to the support frame 1, thereby enabling tilt adjustment.

[0055] like Figure 4As shown, the sliding member 51 includes a sleeve portion 511 that engages with the through section 311, a fixing portion 512 formed by bending and extending the sleeve portion 511 from the side near the limiting rod 52 toward the limiting rod 52, and a limiting groove 513 formed by recessing the fixing portion 512 from the side near the first base plate 11; the limiting rod 52 passes through the limiting groove 513 and is fixedly connected to the fixing portion 512. This design facilitates the fixing of the sliding member 51 and the limiting rod 52, and also facilitates the setting of the sliding member 51 with the elastic member 37 and the control lever 31 respectively.

[0056] like Figure 4 As shown, the opposite sides of the limiting groove 513 protrude and extend to form buckles 514; the limiting rod 52 is provided with a through groove 521 corresponding to the buckle 514; each buckle 514 passes through the corresponding groove 521 and abuts against the side of the limiting rod 52 away from the fixing part 512. This design can improve the stability of the fixation between the sliding part 51 and the limiting rod 52, and facilitate disassembly and replacement.

[0057] The elastic structure 6 includes a helical spring 61, a limiting sleeve 62 surrounding the helical spring 61, a first guide portion 63 fixed to one end of the limiting sleeve 62 and extending into the interior of one end of the helical spring 61, a second guide portion 64 inserted into the interior of the other end of the helical spring 61 and fixed to the second base plate 41, and a rotating shaft 65 passing through the first guide portion 63. The first base plate 11 has two protruding and spaced-apart retaining plates 112 on the side away from the control structure 31. Both ends of the rotating shaft 65 are inserted into the two retaining plates 112 respectively, forming a rotatable connection. This design not only facilitates the hinge connection between the elastic structure 6 and the first base plate 11, but also facilitates the fixed connection between the elastic structure 6 and the second base plate 41, while preventing the helical spring 61 from popping out of its inherent position when compressed or extended.

[0058] Compared with the prior art, the chassis device 100 of this embodiment is designed with a support frame 1, a hydraulic rod 2, a control structure 31, a tail frame 4, a limiting structure 5, and an elastic structure 6. The pressing part 33 of the control structure 31 abuts against the end face of the pressing end 21, and the two ends of the sliding member 51 in the limiting structure 5 along the extension direction of the limiting rod 52 abut against the two ends of the elastic member 37 in the control structure 31. In this way, the control structure 31 and the limiting structure 5 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. At the same time, two adjustment modes can be realized with only one operation, making the operation simpler.

[0059] Example 2

[0060] 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.

[0061] 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: A support frame, the support frame including a first base plate and two first side plate components formed by bending and extending from opposite sides of the first base plate; A hydraulic rod, the pressing end of which passes through the bottom of the first base plate and extends between the two first side plate members; The control structure is spaced apart from the first base plate. The control structure includes a control lever that passes sequentially through two first side plate members and is rotatably connected to each of the two first side plate members. The control lever includes a through section located between the two first side plate members and a grip section formed by bending one end of the through section and extending away from the first side plate members. The through section is also slidably connected to each of the two first side plate members. The control structure further includes a sleeve fitted and fixed to the through section and located between the two first side plate members, and a sleeve extending from the side of the sleeve near the pressing end towards the side of the pressing end. The sleeve comprises a pressing portion extending in a directional direction, a first abutting portion extending from a portion of the sleeve near the grip section in a direction close to the grip section, a second abutting portion extending from a portion of the sleeve away from the grip section in a direction away from the grip section, a groove formed by the inner recess of the second abutting portion, and an elastic member sleeved on the through section and received in the groove; the pressing portion abuts against the end face of the pressing end, the end of the first abutting portion away from the sleeve is spaced apart from the first side plate member near the grip section, and the two ends of the elastic member abut against the two opposite sidewalls of the groove; 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 plurality of limiting holes arranged at intervals through a portion of the second side plate away from the second base plate, and a pressing portion formed by protruding from the side of the third side plate away from the second base plate in a direction away from the second base plate; the second base plate is spaced apart from the first base plate, and the second side plate and the third side plate extend to the outside of two corresponding first side plate members and are respectively hinged to one of the first side plate members; A limiting structure is provided, spaced apart from the first base plate. The limiting structure includes a sliding member abutting against the through section and forming a slidable connection with the through section; a limiting rod sequentially penetrating two first side plate members and forming a fixed connection with the sliding member; and a bayonet groove formed by a recess in a portion of one side of the limiting rod. The two ends of the sliding member along the extension direction of the limiting rod abut against the two ends of the elastic member, and the sliding member is spaced apart from the sleeve. The distance between the sliding member and the sleeve is less than the distance from the end of the first abutting portion away from the sleeve to the first side plate member near the grip section. The limiting rod is spaced apart from the control lever, and the limiting rod is rectangular with one end near the pressing portion abutting against the pressing portion. One end of the limiting rod near the limiting hole is inserted into the limiting hole. The bayonet groove extends from one side of the limiting rod near the first base plate to the other side, and the opening direction of the bayonet groove faces the second base plate. An elastic structure, one end of which is hinged to the first base plate, and the second end of which is fixed to the second base plate.

2. The chassis device as described in claim 1, characterized in that, Each of the first side plate components includes a first vertical plate that extends from one side of the first base plate and is perpendicular to the first base plate, a horizontal plate that extends from the side of the first vertical plate away from the first base plate and is parallel to the first base plate, and a second vertical plate that extends from the side of the horizontal plate away from the first vertical plate and is perpendicular to the first base plate. The second vertical plate and the first vertical plate are spaced apart to form a receiving gap. The second side plate and the third side plate are respectively received within the receiving gap of the two first side plate components.

3. The chassis device as described in claim 2, characterized in that, Each of the cross plates of the first side plate component is provided with a through mounting hole.

4. The chassis device as described in claim 2, characterized in that, The tailstock also includes a hinge shaft that passes sequentially through the second side plate, the third side plate, and the first vertical plate in the two first side plate components; the hinge shaft is fixedly connected to the second side plate and the third side plate respectively, and the hinge shaft is rotatably connected to the first vertical plate in the two first side plate components respectively.

5. The chassis device as described in claim 1, characterized in that, The first base plate has a baffle that bends and extends away from the first base plate on the side near the sleeve; the baffle extends above the sleeve and is positioned directly opposite the pressing end.

6. The chassis device as described in claim 1, characterized in that, The control lever also includes a handle that is sleeved and fixed to the end of the grip section away from the through section.

7. The chassis device as described in claim 1, characterized in that, The sliding member includes a sleeve portion that engages with the through section, a fixing portion formed by bending and extending the sleeve portion from the side near the limiting rod toward the limiting rod, and a limiting groove formed by recessing the fixing portion from the side near the first base plate; the limiting rod passes through the limiting groove and is fixedly connected to the fixing portion.

8. The chassis device as described in claim 7, characterized in that, The limiting groove extends outward from its opposite sides to form a buckle; the limiting rod is provided with a through groove corresponding to the position of the buckle; each buckle passes through the corresponding groove and abuts against the side of the limiting rod away from the fixing part.

9. The chassis device as described in claim 1, characterized in that, The elastic structure includes a helical spring, a limiting sleeve surrounding the helical spring, a first guide portion fixed to one end of the limiting sleeve and extending into the interior of one end of the helical spring, a second guide portion inserted into the interior of the other end of the helical spring and fixed to the second base plate, and a rotating shaft passing through the first guide portion; the first base plate has two protruding and spaced-apart clamping plates on the side away from the control structure, and the two ends of the rotating shaft are respectively inserted into the two clamping plates and form a rotatable connection.

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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