Chassis

Abstract

The utility model provides a chassis which comprises a base and a tail plate, the base is connected with a chair seat and chair legs, the tail plate is connected with a chair back and rotationally arranged on the base, and an elastic component arranged in the front-back direction is arranged between the base and the tail plate and provides elastic buffering for backward rotation of the tail plate. The elastic assembly is composed of an elastic piece and a follower which are arranged in the front-back direction, the follower is rotationally connected to the tail plate and moves front and back along with rotation of the tail plate, and the elastic piece is arranged on the follower in a sleeving mode and stretches out and draws back along with movement of the follower. During use, the tail plate rotates backwards and downwards to drive the follower to move backwards and compress the elastic piece, so that backward falling buffering of the chair back is realized; the key point of the design is that the elastic component is longitudinally arranged and is different from the vertical arrangement of most products; longitudinal arrangement can save the internal space of the chassis in the height direction and effectively compress the thickness of the chassis; the production cost is reduced, the structure is compact, the packaging and transportation space is reduced, the transportation cost is reduced, and a chassis solution which is more efficient in space utilization and lower in cost is provided for the seat.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of furniture, especially a bottom disc. BACKGROUND

[0002] In the seat manufacturing industry, the bottom disc as the core component connecting the seat, the chair leg and the backrest, its design directly relates to the overall performance and cost-effectiveness of the seat; there are a series of problems affecting product competitiveness in the traditional seat bottom disc design.

[0003] In terms of space utilization, the elastic component of most existing bottom discs adopts a vertical arrangement, which can realize the elastic buffering function when the backrest is tilted backward, but occupies a large amount of internal space of the bottom disc in the height direction, making it difficult to reduce the overall thickness of the bottom disc; with the increasing requirements of modern home and office space for the compactness and simplicity of furniture, the larger thickness of the bottom disc not only limits the adaptability of the seat in different space scenarios, but also increases the cramped feeling of the overall space, which cannot meet the user's demand for efficient use of space; from the cost point of view, the larger thickness of the bottom disc means that more materials are needed to manufacture, which directly increases the production cost, and in the packaging and transportation link, due to the larger size of the bottom disc, the transportation space occupied increases, resulting in a substantial increase in transportation cost; for enterprises, the double increase of production cost and transportation cost seriously compresses the profit space and weakens the price competitiveness of products in the market. SUMMARY

[0004] In order to solve the above technical problems, the utility model provides a bottom disc, which comprises a base and a tail plate, the base connects the seat and the chair leg, the tail plate connects the backrest and is rotatably arranged on the base, and an elastic component is arranged between the base and the tail plate along the front-back direction to provide elastic buffering for the backward rotation of the tail plate; the elastic component is composed of an elastic member and a follower, both of which are arranged along the front-back direction, the follower is rotatably connected to the tail plate and moves forward and backward with the rotation of the tail plate, and the elastic member is sleeved on the follower and moves with the movement of the follower; in use, the tail plate rotates backward and downward, driving the follower to move backward and compressing the elastic member to realize the backward buffering of the backrest; the key of this design lies in the longitudinal arrangement of the elastic component, which is different from the vertical arrangement of most products; the longitudinal arrangement can save the internal space of the bottom disc in the height direction and effectively compress the thickness of the bottom disc; it not only reduces the production cost, but also makes the structure compact, reduces the packaging and transportation space and transportation cost, and provides a bottom disc solution with higher space utilization and lower cost for the seat.

[0005] The technical scheme of the utility model is implemented as follows:

[0006] A base plate comprises a base configured to connect a seat and a leg of a chair and a tail plate configured to connect a back of the chair, the tail plate is rotationally arranged on the base, a spring assembly is arranged between the tail plate and the base along a front-rear direction, the spring assembly is configured to provide elastic buffering when the tail plate rotates backward; the spring assembly comprises an elastic member and a follower, the elastic member and the follower are both arranged along the front-rear direction, the follower is rotationally connected to the tail plate, the follower is configured to move forward and backward with the rotation of the tail plate, the elastic member is sleeved on the follower, and the elastic member is configured to stretch and contract in the front-rear direction with the movement of the follower.

[0007] In the scheme, the base serves as the main support, and when the tail plate rotates backward and downward, it drives the follower to move backward and compresses the elastic member, thereby providing elastic buffering when the back is tilted backward, ensuring comfort; the key point is that in the scheme, the spring assembly is arranged longitudinally along the front-rear direction instead of vertically as in most products, which can save internal space of the base plate in the height direction, reduce the thickness of the base plate, and reduce the cost while making the structure more compact, thereby further reducing packaging and transportation costs.

[0008] As a preferred, a support shaft is arranged on the tail plate, a connecting seat is sleeved on the support shaft, the connecting seat is rotationally arranged on the tail plate through the support shaft, and the follower is connected with the connecting seat. The follower can be rotationally arranged on the tail plate through the connecting seat and the support shaft, so that the movement of the follower can adapt to the rotation of the tail plate.

[0009] As a preferred, the rear end of the follower is threadedly connected with the connecting seat, and the front end of the follower is a control end configured to be rotated by a user to adjust the length of the follower protruding from the connecting seat. The adjustment of the follower can change the compression amount of the elastic member, so that the elastic member can provide different elastic forces for the tail plate to adapt to people of different weights and make people of different weights feel comfortable buffering when they lean backward.

[0010] As a preferred, an adjusting groove is arranged on the end face of the control end. The adjusting groove is an internal hexagonal hole, and the user can use an internal hexagonal wrench to rotate and adjust the follower to adjust the length of the follower protruding from the connecting seat, thereby adjusting the initial elastic force of the elastic member.

[0011] As a preferred, the elastic member and the follower are both two, the two followers are arranged in a left-right interval, and the two elastic members are sleeved on the two followers respectively; two left-right interval shaft sleeves are arranged on the connecting seat, the shaft sleeves protrude forward, and the rear ends of the two followers are arranged in the two shaft sleeves respectively. The two sets of elastic members and followers can provide more elastic force, the elastic force requirement of a single elastic member can be appropriately reduced, and such an arrangement can also make the elastic force more stable.

[0012] As preferred, the base is internally provided with a vertical support plate, the end of the follower away from the tail plate is provided with a blocking part, and the two ends of the elastic member are respectively abutted on the blocking part and the support plate; the elastic member is always in a compressed state. The elastic member being always in a compressed state enables the follower to be arranged front and back and to move along the front and back directions, and the movement of the follower along the front and back directions enables the elastic member to be compressed or elongated to change the elastic force of the elastic member, and the two are complementary to each other.

[0013] As preferred, the support plate is provided with an avoiding hole, the diameter of the avoiding hole is larger than the diameter of the follower, and the avoiding hole is configured to avoid the follower. The support shaft is located above the rotation connection point of the tail plate and the base, and when the tail plate rotates, the support shaft will be displaced in the height direction, and the rear end of the follower will be offset upward, and the diameter of the avoiding hole needs to be large enough to completely avoid the follower.

[0014] As preferred, the support plate is provided with a plug-in part along the left and right directions, and the base further comprises two mounting parts which are vertically spaced apart and used for mounting the support plate; the lower end of the mounting part is provided with a plug-in slot, and the plug-in part is inserted into the plug-in slot and fixedly connected with the mounting part.

[0015] As preferred, the base has two longitudinal hollows and a vertical rod located between the two hollows, the vertical rod has a blocking part, the upper end of the support plate is provided with a groove, the support plate is located in front of the blocking part and the groove is matched with the vertical rod; the support plates on both sides of the groove are abutted with the blocking part under the action of the elastic member. The blocking part supports the support plate, and further supports the elastic member, so that the elastic member works more stably.

[0016] As preferred, the elastic member is a spring, and the follower is a screw rod.

[0017] The design starting point, concept and beneficial effects of the utility model with the above technical scheme are as follows:

[0018] In the scheme, the base serves as the main support, and when the tail plate rotates rearward and downward, the follower is driven to move rearward and compress the elastic member, thereby giving elastic buffering when the chair back is tilted backward, and ensuring comfort; the key point is that the elastic force assembly is longitudinally arranged along the front and back directions instead of being vertically arranged as in most products, so that the internal space of the chassis can be saved in the height direction, the thickness of the chassis is compressed, the cost is reduced, the structure is more compact, and the packaging and transportation cost is further reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a perspective structural schematic view of the chassis with a decorative cover in the embodiment of the utility model;

[0020] Figure 2 It is a perspective structural schematic view of the connection of the base side plate and the seat connecting piece rotation connection part in the embodiment of the utility model;

[0021] Figure 3 The side view of the base side plate and the seat connecting piece rotating connection part connection in the embodiment of the utility model

[0022] Figure 4 The three-dimensional structure schematic of the seat connecting piece in the embodiment of the utility model Figure 1 ;

[0023] Figure 5 The three-dimensional structure schematic of the seat connecting piece in the embodiment of the utility model Figure 2 ;

[0024] Figure 6 The three-dimensional structure schematic when the seat connecting piece and the base are connected in the embodiment of the utility model

[0025] Figure 7 The three-dimensional structure schematic when the seat connecting piece and the support plate are connected in the embodiment of the utility model

[0026] Figure 8 The three-dimensional structure schematic when the elastic assembly is arranged in the chassis in the embodiment of the utility model Figure 1 ;

[0027] Figure 9 The three-dimensional structure schematic when the elastic assembly is arranged between the seat connecting piece and the tail plate in the embodiment of the utility model

[0028] Figure 10 The three-dimensional structure schematic when the lock pin is arranged in the chassis in the embodiment of the utility model

[0029] Figure 11 The three-dimensional structure schematic when the lock pin and the operating rod are connected in the embodiment of the utility model

[0030] Figure 12 The three-dimensional structure schematic of the tail plate in the embodiment of the utility model

[0031] Figure 13 The three-dimensional structure schematic when the elastic assembly is arranged in the chassis in the embodiment of the utility model Figure 2 .

[0032] The numerals are: base 1; side plate 11; notch 111; positioning plug 112; seat connecting piece 2; main body part 21; hollow part 211; vertical rod 212; resisting part 213; positioning hole 214; rotating connecting part 22; mounting hole 221; mounting part 23; insertion slot 231; rotating shaft 3; support plate 4; insertion part 41; recess 42; avoiding hole 43; elastic ball 44; tail plate 5; blocking part 51; first blocking slot 511; second blocking slot 512; third blocking slot 513; elastic piece 6; follower 7; control end 71; blocking part 72; support shaft 8; connecting seat 9; decorative cover 10; operating rod 12; extension plate 121; force feedback blocking slot 122; locking pin 13; convex part 131; first spring 14; second spring 15. DETAILED DESCRIPTION

[0033] In order to more clearly understand the above objectives, features and advantages of the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0034] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, therefore, the scope of protection of the present application is not limited by the specific embodiments disclosed below.

[0035] In the description of the present application, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0036] The specific embodiments of the present application are as follows:

[0037] As shown in Figure 2 , 8 , the present application provides a bottom plate, which comprises a base and a tail plate 5, the base is configured to connect the seat and the chair leg of the seat, the tail plate 5 is configured to connect the back of the seat, the tail plate 5 is rotatably arranged on the base, and the tail plate 5 and the base are provided with a spring assembly, the spring assembly is arranged along the front and rear directions, and the spring assembly is configured to provide elastic buffering when the tail plate 5 rotates backward; the spring assembly comprises an elastic piece 6 and a follower 7, the elastic piece 6 and the follower 7 are arranged along the front and rear directions, the follower 7 is rotatably connected to the tail plate 5, the follower 7 is configured to move forward and backward with the rotation of the tail plate 5, the elastic piece 6 is sleeved on the follower 7, and the elastic piece 6 is configured to stretch and contract in the front and rear directions with the movement of the follower 7.

[0038] In the scheme, the base supports as the main body, the tail plate 5 drives the follower 7 to move backward and compresses the elastic member 6 when it rotates backward and downward, thereby giving the chair back a flexible buffer when it is tilted backward, ensuring comfort; the focus is that the elastic assembly is arranged longitudinally in the front-back direction in the scheme instead of being arranged vertically as in most products, which can save internal space of the chassis in the height direction, compress the thickness of the chassis, reduce costs while making the structure more compact, thereby further reducing packaging and transportation costs.

[0039] Specifically, as shown in Figures 1-3 The base includes a base 1 configured to connect the support base of the seat and a seat connecting piece 2 configured to connect the seat part of the seat; the seat connecting piece 2 is fixedly connected with the base 1, and the seat connecting piece 2 includes a main body part 21 and two rotating connecting parts 22 arranged at intervals on the main body part 21 and integrally formed, and the rotating connecting part 22 is configured to bend downward from the main body part 21 to be vertical and is used to rotate and connect the tail plate 5; the rotating connecting part 22 is provided with a mounting hole 221, and the mounting hole 221 is provided with a rotating shaft 3, and the tail plate 5 is rotatably connected with the rotating connecting part 22 through the rotating shaft 3.

[0040] In the scheme, the main body part 21 and the rotating connecting part 22 of the seat connecting piece 2 are integrally formed, that is, the rotating connecting part 22 is a part of the seat connecting piece 2 and is bent from the main body part 21, both of which can maintain sufficient parallelism, and the mounting hole 221 for mounting the rotating shaft 3 is arranged on the rotating connecting part 22, so that the concentricity of the two mounting holes 221 can be effectively maintained, the rotating shaft 3 is arranged horizontally and in the left-right direction, and relative to the main body part 21, the rotating shaft 3 can be parallel to it and arranged in the width direction thereof without being skewed in any direction, thereby maintaining the tail plate 5 mounted thereon horizontal and coaxial with the main body part 21; further, after the seat part is arranged on the seat connecting piece 2 and the backrest is arranged on the tail plate 5, the scheme can maintain the backrest and the seat part perpendicular to each other, and the backrest can be kept vertical without being skewed left and right from the axis, and the user's experience is more comfortable.

[0041] The chassis with multiple shafts to realize the tilting of the tail plate has more transmission, so it is more likely to produce abnormal noise, and in addition, after the abnormal noise occurs, the user cannot determine which shaft is the problem, which is not conducive to after-sales and maintenance; the present scheme is just the opposite, the tilting of the tail plate is realized by a single shaft, the transmission is less, it is not easy to produce abnormal noise, and even if abnormal noise occurs, it can be quickly determined as the problem of the rotating shaft 3, which is conducive to after-sales and maintenance.

[0042] Specifically, as shown in Figures 4-6As shown, the seat connecting piece 2 further comprises two mounting portions 23, which are integrally formed with the main body portion 21 and are configured to be bent downward from the main body portion 21 to be vertical, and are used to mount part components, which is ingenious in structure and saves cost. The main body portion 21 has two longitudinal hollows 211 and a vertical rod 212 between the two hollows 211, and the hollows 211 are formed by bending the rotating connecting portion 22 and the mounting portion 23 downward from the main body portion 21. The mounting portion 23 is parallel to the rotating connecting portion 22, the mounting portion 23 is closer to the inner side relative to the rotating connecting portion 22, and the rotating connecting portion 22 is closer to the rear relative to the mounting portion 23. The base 1 is roughly U-shaped, which has two side plates 11 arranged at intervals left and right, the side plates 11 are vertically arranged and fixedly connected with the rotating connecting portion 22 by welding, and at this time the mounting portion 23 is located inside the side plates 11; the side plates 11 are used to be connected with the rotating connecting portion 22, so that the base 1 and the seat connecting piece 2 are connected together.

[0043] The rotating connecting portion 22 is located at the rear of the main body portion 21, and the side plates 11 are located beside and in front of the rotating connecting portion 22; the rear of the side plates 11 is provided with a notch 111, the shape of the notch 111 is adapted to the side edge profile of the rotating connecting portion 22, and the front of the rotating connecting portion 22 is located in the notch 111; the notch 111 of the side plates 11 is in shape fit with the rotating connecting portion 22, which facilitates the alignment of the positions of the base 1 and the seat connecting piece 2 for connection. Further, the upper end of the side plates 11 is provided with a positioning plug 112 protruding upward, and the main body portion 21 is provided with a positioning hole 214, and the positioning plug 112 is inserted into the positioning hole 214; the base 1 and the seat connecting piece 2 are fixedly welded, and the rotating connecting portion 22 and the side plates 11 are fixedly welded; the positioning plug 112 and the positioning hole 214 facilitate the alignment of the base 1 and the seat connecting piece 2, and the fixed welding of the two is convenient, reliable and low in cost.

[0044] Further, as shown in the drawings, Figures 7-9 The seat connecting piece 2 and the tail plate 5 are provided with a spring assembly, which is configured to provide elastic buffering when the tail plate 5 rotates backward; the spring assembly is arranged along the length direction of the base plate; in this scheme, the spring assembly is arranged along the length direction of the base plate instead of being arranged vertically as in most products, which can save the internal space of the base plate in the height direction, compress the thickness of the base plate, reduce the cost while making the structure more compact, and further reduce the packaging and transportation cost.

[0045] Specifically, the elastic assembly comprises the elastic member 6 and the follower 7, the elastic member 6 and the follower 7 are arranged in the front-rear direction, the elastic member 6 is sleeved on the follower 7, and the follower 7 is rotationally connected to the tail plate 5; the seat connecting piece 2 is provided with a vertical support plate 4, one end of the follower 7 away from the tail plate 5 is provided with a blocking portion 72, the blocking portion 72 protrudes radially along the follower 7, and the two ends of the elastic member 6 are respectively abutted against the blocking portion 72 and the support plate 4; the elastic member 6 is always in a compressed state, so that the follower 7 can be kept arranged in the front-rear direction and moved in the front-rear direction, and the movement of the follower 7 in the front-rear direction can make the elastic member 6 compressed or elongated to change the elastic force of the elastic member 6, and the two are complementary to each other. The elastic member 6 is a buffer spring, and the follower 7 is a screw rod; the tail plate 5 can drive the follower 7 to move when the tail plate 5 rotates, the movement of the follower 7 can make the elastic member 6 compressed or elongated, and the elastic member 6 gives the tail plate 5 a forward elastic force in this way; the support plate 4 is provided with a plug-in portion 41 protruding in the left-right direction, the mounting portion 23 is provided with a plug groove 231 at the lower end, the plug-in portion 41 is plugged into the plug groove 231, and the plug-in portion 41 is fixedly connected with the mounting portion 23; the vertical rod 212 is provided with a blocking portion 213, the support plate 4 is provided with a groove 42 at the upper end, the support plate 4 is located on the front side of the blocking portion 213 and the groove 42 is matched with the vertical rod 212; the support plates on the two sides of the groove 42 abut against the blocking portion 213; the blocking portion 213 supports the support plate 4, and further supports the elastic member 6, so that the elastic member 6 works more stably.

[0046] The tail plate 5 is provided with a support shaft 8, the support shaft 8 is sleeved with a connecting seat 9, the connecting seat 9 is rotationally arranged on the tail plate 5 through the support shaft 8, and the follower 7 is connected with the connecting seat 9; the follower 7 can be rotationally arranged on the tail plate 5 through the connecting seat 9 and the support shaft 8, so that the movement of the follower 7 can adapt to the rotation of the tail plate 5; one end of the follower 7 is threadedly connected with the connecting seat 9, and the other end of the follower 7 is a control end 71, the control end 71 is configured to be rotated by a user to adjust the length of the follower 7 protruding from the connecting seat 9; the blocking portion 72 is located at the control end 71, and an internal hexagonal hole is arranged on the end face of the control end 71, so that the user can adjust through an internal hexagonal wrench; the adjustment of the follower 7 can change the compression amount of the elastic member 6, so as to adjust the initial deformation amount of the elastic member 6, so that the elastic member 6 can provide different elastic forces for the tail plate 5, so as to adapt to different weight groups and make different weight groups feel comfortable buffering when leaning back.

[0047] The elastic member 6 and the follower 7 are both two, the two followers 7 are arranged at intervals in the left-right direction, and the two elastic members 6 are sleeved on the two followers 7 respectively; the connecting seat 9 is provided with two shaft sleeves arranged at intervals in the left-right direction, the shaft sleeves protrude forward, and the rear ends of the two followers 7 are arranged in the two shaft sleeves respectively.

[0048] The support plate 4 is provided with an avoiding hole 43, the diameter of the avoiding hole 43 is larger than the diameter of the follower 7, the avoiding hole 43 is configured to avoid the follower 7; the support shaft 8 is located above the rotating shaft 3, when the tail plate 5 rotates, the support shaft 8 will displace in the height direction, the rear end of the follower 7 will be offset upward, the diameter of the avoiding hole 43 needs to be large enough to completely avoid the follower 7.

[0049] The base 1 is further provided with a decorative cover 10 to prevent pinching; the upper end of the decorative cover 10 is provided with an elastic buckle and is clamped with the main body part 21; the decorative cover 10 prevents pinching; the control end 71 of the follower 7 is exposed from the two holes of the device cover.

[0050] As shown in Figures 10-12 In addition, the mounting part 23 of the seat connecting part 2 is provided with a locking pin 13 sliding left and right, the tail plate 5 includes a blocking part 51 located at the front part thereof, when the locking pin 13 slides towards the blocking part 51 and is clamped with the sliding part, the tail plate 5 is relatively fixed with the seat connecting part 2; the blocking part 51 is provided with a first blocking groove 511, a second blocking groove 512 and a third blocking groove 513, which are arranged from top to bottom in sequence, the blocking part 51 is configured to enter different blocking grooves with the locking pin 13 to change the inclination angle at which the tail plate 5 stays; the first blocking groove 511 and the third blocking groove 513 are notches located at the end of the blocking part 51, and the second blocking groove 512 is a hole.

[0051] The base 1 is slidingly provided with an operating lever 12 rotating and sliding left and right, the operating lever 12 is configured to control the air rod supporting the base when rotating, and to control the sliding of the locking pin 13 when sliding; the support plate 4 is provided with an elastic ball 44, and the operating lever 12 is provided with two force feedback blocking grooves 122, when the operating lever 12 is pulled out, the elastic ball 44 switches between the two force feedback blocking grooves 122, and when the operating lever 12 is pushed inward, the tail plate 5 is locked, and when the operating lever 12 is pulled outward, the rotation of the tail plate 5 is unlocked.

[0052] The locking pin 13 is sleeved with a first spring 14 and a second spring 15, the locking pin 13 is provided with a convex part 131 protruding radially in the middle, the operating lever 12 is provided with an extension plate 121 clamped thereon, the first spring 14 and the second spring 15 are respectively located on the left and right sides of the convex part 131, the two ends of the first spring 14 respectively abut against the mounting part 23 and the convex part 131, and the two ends of the second spring 15 respectively abut against the convex part 131 and the extension plate 121; the locking of the locking pin 13 has hysteresis, that is, even if the locking pin 13 is not aligned with the blocking groove, the operating lever 12 can be pushed to be locked in advance, and after the tail plate 5 is further rotated to make the locking pin 13 aligned with the blocking groove, the locking pin 13 enters the blocking groove under the action of the second spring 15.

Claims

1. A chassis characterized by: The base is configured to connect the seat and the leg of the chair, and the tail plate is configured to connect the back of the chair. The tail plate is rotatably arranged on the base, and a spring assembly is arranged between the tail plate and the base along the front-rear direction. The spring assembly is configured to provide elastic buffering when the tail plate rotates backward. The spring assembly includes a spring and a follower. The spring and the follower are arranged along the front-rear direction. The follower is rotatably connected to the tail plate. The follower is configured to move forward and backward with the rotation of the tail plate. The spring is sleeved on the follower and is configured to stretch and contract in the front-rear direction with the movement of the follower. The base is internally provided with a vertical support plate. One end of the follower away from the tail plate has a blocking part. The two ends of the spring are respectively abutted on the blocking part and the support plate. The spring is always in a compressed state. The base has two longitudinal hollows and a vertical rod between the two hollows. The vertical rod has a blocking part. The upper end of the support plate is provided with a groove. The support plate is located on the front side of the blocking part, and the groove is matched with the vertical rod. The support plates on both sides of the groove are abutted with the blocking part under the action of the spring.

2. The base pan of claim 1, wherein: A support shaft is arranged on the tail plate. A connecting seat is sleeved on the support shaft and is rotatably arranged on the tail plate through the support shaft. The follower is connected with the connecting seat.

3. The base pan of claim 2, wherein: The rear end of the follower is threadedly connected with the connecting seat. The front end of the follower is a control end. The control end is configured to be rotated by a user to adjust the length of the follower protruding from the connecting seat.

4. The base pan of claim 3, wherein: An internal hexagonal hole is arranged on the end face of the control end.

5. The base pan of claim 2, wherein: The spring and the follower are both two. The two followers are arranged in a left-right interval. The two springs are respectively sleeved on the two followers. The connecting seat is provided with two left-right interval shaft sleeves. The shaft sleeves protrude forward. The rear ends of the two followers are respectively arranged in the two shaft sleeves.

6. The chassis of claim 1, wherein: An avoiding hole is arranged on the support plate. The diameter of the avoiding hole is larger than the diameter of the follower. The avoiding hole is configured to avoid the follower.

7. The chassis of claim 1, wherein: The support plate protrudes a plug-in part along the left-right direction. The base further includes two mounting parts arranged in a left-right interval and vertically arranged for mounting the support plate. The lower end of the mounting part is provided with a plug-in slot. The plug-in part is inserted into the plug-in slot, and the plug-in part is fixedly connected with the mounting part.

8. The chassis of claim 1, wherein: The spring is a spring, and the follower is a screw rod.

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