Multi-gear locking chassis

Abstract

The multi-gear locking chassis comprises a main body seat and a tail plate, the tail plate is rotationally arranged on the main body seat, and a front extending part of the tail plate vertically extends forwards to the middle of the main body seat; at least two parallel and spaced lock pins are inserted into the main body seat in a sliding manner, and the axes are in the left-right direction; the extension part is provided with at least two groups of staggered locking positions, each group corresponds to one lock pin, and the side view projection of each lock pin is located on the movement path of the corresponding locking position; the driving assembly drives the lock pin to slide, and the lock pin can be inserted and locked only when the lock pin is aligned with the corresponding locking position; the locking positions are staggered in the front-back direction and the height direction, it is guaranteed that only one lock pin is used for locking at the same time, and different lock pins correspond to different rotation angles of the tail plate. According to the design, through the arrangement of multiple lock pins and dislocation lock positioning, the space limitation of a traditional single lock pin scheme is broken through, large-angle multi-gear locking is achieved, meanwhile, the overall height of the lock positioning and the size of an extending part are reduced, and the material cost is reduced; and the gear spacing is smaller, the adjustment is finer and smoother, and the use experience is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of furniture, especially a multi -gear locking chassis. BACKGROUND

[0002] In the field of seat chassis design, the realization of multi-gear locking function has been facing the dual challenge of space occupation and structural strength. The traditional scheme of single locking pin matched with a row of locking holes has significant defects. On the one hand, the dense arrangement of locking holes along the height direction needs to occupy a large amount of space, which leads to the fact that the front locking hole area is easy to abut against the main body seat when the tail plate rotates, and it is difficult to realize large-angle rotation locking. On the other hand, if the spacing of the locking holes is forcibly compressed to adapt to large-angle rotation, the structure will fail due to insufficient material strength, which cannot pass the strength test, and seriously affects the safety and service life of the seat.

[0003] Moreover, the locking logic of single locking pin has been difficult to meet the user's demand for multi-gear fine adjustment. The traditional single locking pin scheme either leads to insufficient adjustment accuracy due to sparse locking gears, or cannot cover a large angle range due to structural limitations. In addition, the material redundancy and space waste brought by dense locking holes further increase the production cost and assembly complexity, which is contrary to the design trend of modern seat lightweight and compactness.

[0004] The market urgently needs a new chassis scheme that can realize large-angle multi-gear precise locking, optimize space utilization, and improve structural strength. SUMMARY

[0005] In order to solve the above technical problems, the utility model provides a multi-gear locking chassis, which comprises a main body seat and a tail plate. The tail plate is rotatably arranged in the main body seat, and the front extension part of the tail plate extends vertically forward to the middle part of the main body seat. At least two parallel and spaced locking pins are slidingly inserted into the main body seat, and the axis of each locking pin is along the left-right direction. The extension part is provided with at least two groups of staggered locking positions, each group corresponding to a locking pin, and the side view projection of the locking pin is located on the movement path of the corresponding locking position. A driving assembly drives the locking pin to slide, and the locking pin can be inserted into the locking position only when the locking pin is aligned with the corresponding locking position. The locking positions are staggered in the front-rear and height directions, which ensures that only one locking pin is locked at the same time, and different locking pins correspond to different rotation angles of the tail plate. This design breaks through the space limitation of the traditional single locking pin scheme by arranging multiple locking pins and staggered locking positions. While realizing large-angle multi-gear locking, the overall height of the locking position and the size of the extension part are reduced, and the material cost is reduced. Moreover, the gear spacing is smaller, the adjustment is more delicate, and the use experience is improved. The multi-pin independent locking mechanism also enhances the structural strength and locking reliability, providing a compact, precise and durable multi-gear locking solution for the seat chassis.

[0006] The technical scheme of the utility model is implemented as follows:

[0007] A multi-gear locking chassis comprises a main body seat and a tail plate, the tail plate is rotationally arranged on the main body seat, the front part of the tail plate is provided with an extension part, the extension part vertically and forwardly extends to the middle part of the main body seat; at least two locking pins are slidingly arranged on the main body seat, different locking pins are arranged in parallel and at intervals, and the axes of the locking pins are arranged in the left-right direction; at least two groups of staggered locking positions are arranged on the extension part, the locking positions move with the rotation of the tail plate, each group of locking positions corresponds to one locking pin, and the side view projection of the locking pin is located on the movement path of the corresponding locking position; a driving assembly is further arranged in the main body seat, the driving assembly is configured to drive the locking pin to slide, and when any locking pin is aligned with the corresponding locking position, the driving assembly can drive the locking pin to enter the corresponding locking position; each group of locking positions are staggered in the height direction and the front-back direction, and the locking pin and the locking position are configured such that only one locking pin can enter its corresponding locking position at the same time, and different locking pins enter the corresponding locking position to keep the tail plate at different rotation angles.

[0008] The main body seat is used to connect the supporting base of the seat, such as the lifting air rod and the supporting leg, and the tail plate is used to connect the back of the seat, and the rotation of the tail plate on the main body seat is the reclining of the back of the seat; the locking positions are staggered in the front-back direction and the height direction, the stagger in the front-back direction is for corresponding interval locking pins, and the stagger in the height direction is for locking the tail plate at different rotation angles; the side view projection of the locking pin is located on the movement path of the corresponding locking position, so that the locking position can be aligned with the locking pin when the tail plate rotates; during locking, only one locking pin works at a time, and it is enough to lock the tail plate, and due to the arrangement of the locking positions, the tail plate can be locked at multiple rotation angles, and different locking pins work at different angles; through the arrangement of multiple locking pins and multiple groups of locking positions, the multi-gear locking at a large angle is realized, the overall height occupied by the locking positions is reduced, the size of the extension part is reduced, the material cost is reduced, the height direction between different locking positions is more compact, the difference between gears is smaller, the selection and adjustment are more delicate, and the use experience is improved.

[0009] As a preferred embodiment, the driving assembly comprises a first elastic member and a second elastic member, the locking pin is provided with a protruding part, the first elastic member and the second elastic member are located on both sides of the protruding part in the radial direction of the locking pin, the first elastic member is away from the extension part relative to the second elastic member, the first elastic member always gives the locking pin a spring force moving towards the extension part, and the second elastic member always gives the locking pin a spring force moving away from the extension part; when the locking pin enters the corresponding locking position, the first elastic member is elongated, and the second elastic member is compressed; when the locking pin leaves the locking position, the first elastic member is compressed, and the second elastic member is elongated. The first elastic member and the second elastic member are arranged in cooperation with each other, and together make the locking pin in a floating state, the compression or elongation of the first and second elastic members can drive the locking pin to move, and when the locking pin is blocked and stationary, it can also provide a trend of movement, and when the locking pin is no longer blocked, it can move; the locking pin can be directly controlled by a pull wire, and different locking pins can be controlled respectively, but it is not the most preferred.

[0010] As preferred, the driving assembly further comprises a slider, the slider is slidingly arranged on the main body seat in the left-right direction, the locking pins are further arranged in the slider, the first elastic members are all in abutment with the slider, the other end of the first elastic members is in abutment with the protruding portion, the second elastic members are all in abutment with the main body seat, the other end of the second elastic members is in abutment with the protruding portion; the slider is configured to simultaneously control the elongation or compression of the first elastic members; when the slider slides away from the extending portion, the first elastic members and the second elastic members are all elongated, all the locking pins slide away from the extending portion, and the locking pins located in the locking positions are out of the locking positions; when the slider slides towards the extending portion and any locking pin is aligned with the corresponding locking position, the first elastic members and the second elastic members on the locking pin are compressed, the locking pin enters the locking position, and the first elastic members on the other locking pins are also shortened. The main purpose of the slider is to simultaneously control the movement of all the locking pins, but not directly, but indirectly through the elastic members; the slider slides away from the extending portion, and the unlocking of the locking pins also needs to slide away from the extending portion, so the second elastic members must be elongated, and after the second elastic members are elongated, the elastic force becomes smaller, in order to maintain force balance, the elastic force of the first elastic members also becomes smaller, so the first elastic members are also elongated, from which it can be seen that the distance of the slider sliding is greater than that of the locking pin sliding; similarly, after the locking pin enters the locking position, the second elastic members are compressed, so the elastic force becomes larger, in order to maintain force balance, the elastic force of the first elastic members also becomes larger, so the first elastic members are also compressed; the locking pins that are not aligned with the locking positions are blocked by the extending portion and cannot move, the first elastic members on the locking pins are definitely compressed, and the second elastic members at least will not be elongated, that is, they may be compressed or not changed, which depends on whether there is a gap between the end of the locking pin and the extending portion when unlocking, if there is no gap, the length of the second elastic members will not change, generally there will be a gap, and the length of the second elastic members will also be shortened, but at this time the elastic force of the first and second elastic members will not be in a state of force balance, and the locking pin will be pushed by the first elastic members to abut against the extending portion; further, when none of the locking pins are aligned with the locking positions, the slider moves towards the extending portion, and the first elastic members still give the locking pins a sliding force towards the extending portion after resisting the second elastic members, at this time, as long as the tail plate is further rotated to align any locking pin with its corresponding locking position, the locking pin can enter the locking position under the action of the first elastic members to complete the locking.

[0011] As preferred, a third elastic member is arranged between the slider and the main body seat, one end of the third elastic member is in abutment with the slider, and the other end is in abutment with the main body seat on the side away from the extending portion, and the third elastic member is configured to always give the slider a sliding force towards the extending portion.

[0012] As a preferred, the slider is controlled by a pull wire. In combination with the above scheme, when the user operates, only the unlocking can be operated by the pull wire, and the release of the pull wire is the switching to the locking, and even if the locking pin is not aligned with the locking position, the locking pin can be aligned with the locking position after the tail plate is slightly rotated, so that the delayed locking is realized; in this process, the tail plate can be rotated upward or downward, depending on the extent to which the user leans on the back of the chair.

[0013] As a preferred, the main body seat is fixedly provided with a mounting seat, the mounting seat comprises two sliding seat plates, the two sliding seat plates are arranged in front of and behind each other, a sliding groove is formed in each sliding seat plate, and one insertion block is protruded on each side of the slider, and the two insertion blocks are slidably inserted into the sliding grooves. The sliding seat plate of the mounting seat is also provided with an open mouth, which is communicated with the sliding groove, so that the insertion block of the slider is inserted into the sliding groove.

[0014] As a preferred, the mounting seat further comprises an abutting plate, the sliding seat plate is vertically arranged along the left-right direction, and the abutting plate is vertically arranged along the front-rear direction; the abutting plate is arranged close to the extension part, and the second elastic member abuts against the abutting plate. The length of the second elastic member directly abutting against the main body seat needs to be long, and the position of the abutting plate is moderate, which not only makes the elastic member easier to control, but also saves the cost of the elastic member.

[0015] As a preferred, the locking pin has two, and the locking position has two groups; the first group of locking positions comprises the first locking position and the third locking position, and the second group of locking positions comprises the second locking position, the first locking position is located above the second locking position, and the third locking position is located below the second locking position; the second locking position is closer to the rotating connection point of the tail plate than the first locking position and the third locking position.

[0016] As a preferred, the first locking position is a notch, and the second locking position and the third locking position are through holes. The first locking position is a notch, which does not need to be punched, which not only simplifies the production, but also reduces the use of materials.

[0017] As a preferred, the tail plate comprises a connecting plate and two vertical rotating plates, the two rotating plates are arranged on the left and right sides of the connecting plate and are spaced apart, and the rotating plates are located on the outer side of the main body seat, and the extension part is located on one of the rotating plates and is located on the outer side of the main body seat. The rotating plate is located on the outer side of the main body seat, and the extension part is also located on the outer side of the main body seat, which can effectively avoid the structure inside the main body seat and prevent movement interference.

[0018] The design starting point, concept and beneficial effects of the utility model with the above technical scheme are:

[0019] The main seat is used for connecting the supporting base of the seat, such as the lifting air rod and the supporting foot, and the tail plate is used for connecting the back of the seat, and the rotation of the tail plate on the main seat is the reclining of the back; the locking positions are staggered in the front-rear direction and the height direction, the staggering in the front-rear direction is for corresponding to the locking pins, and the staggering in the height direction is for locking the tail plate at different rotation angles; the side view projection of the locking pin is located on the movement path of the corresponding locking position, so that the locking position can be aligned with the locking pin when the tail plate rotates; when locking, only one locking pin works at a time, and it is enough to lock the tail plate, and due to the arrangement of the locking positions, the tail plate can be locked at multiple rotation angles, and different locking pins work at different angles; through the arrangement of the multiple locking pins and multiple locking positions, the gear locking is realized, the overall height occupied by the locking positions is reduced, the size of the extension part is reduced, the material cost is reduced, the height direction between different locking positions is more compact, the difference between gears is smaller, the selection and adjustment are more delicate, and the use experience is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a perspective view of the chassis of the chair in the embodiment of the utility model Figure 1 ;

[0021] Figure 2 is a perspective view of the chassis of the chair in the embodiment of the utility model Figure 2 ;

[0022] Figure 3 is a top view of the chassis of the chair in the embodiment of the utility model

[0023] Figure 4 is a side view when the locking pin enters the second locking position in the embodiment of the utility model

[0024] Figure 5 is a side view when the locking pin enters the third locking position in the embodiment of the utility model

[0025] Figure 6 is a perspective view of the main seat in the embodiment of the utility model

[0026] Figure 7 is a perspective view of the main seat in the embodiment of the utility model

[0027] Figure 8 is a perspective view of the main seat in the embodiment of the utility model

[0028] Figure 9 is a perspective view of the main seat in the embodiment of the utility model

[0029] Figure 10 The exploded view of the additional shaft and the buffer elastic piece in the embodiment of the utility model;

[0030] Figure 11 The exploded view of the sliding block, the locking pin and the second mounting seat in the embodiment of the utility model;

[0031] Figure 12 The schematic view of the locking pin in the embodiment of the utility model being located on the movement path of the corresponding locking position.

[0032] The reference signs are as follows: main body seat 1, first part 101, second part 102, third part 103, side plate 11, bottom plate 12, seat mounting plate 13, tail plate 2, connecting plate 21, rotating plate 22, extension plate 23, first locking position 231, second locking position 232, third locking position 233, support shaft 24, rotating shaft 3, first mounting seat 4, sleeve 5, pressing piece 6, additional shaft 7, buffer elastic piece 8, first pull wire 9, second pull wire 10, second mounting seat 14, sliding seat plate 141, abutting plate 142, sliding groove 143, opening 144, blocking seat 145, locking pin 15, protruding part 151, first elastic piece 16, second elastic piece 17, third elastic piece 18, sliding block 19, insertion block 191. DETAILED DESCRIPTION

[0033] In order to more clearly understand the above purpose, features and advantages of the utility model, the utility model will be further described in detail below in combination with 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, a lot of specific details are set forth in order to facilitate a thorough understanding of the utility model, however, the utility model can also be implemented in other ways different from the description herein, therefore, the protection scope of the utility model is not limited by the specific embodiments disclosed below.

[0035] In the description of the utility model, 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 utility model are as follows:

[0037] As Figures 1-3As shown, the utility model provides a kind of multi-gear locking chassis, including main seat 1, main seat 1 includes first portion 101, second portion 102 and third portion 103, first portion 101 is located main seat 1 front end and is used to connect the support base of chair seat, third portion 103 is located main seat 1 rear end and is equipped with tilting buffer assembly, second portion 102 is located between first portion 101 and third portion 103 and is equipped with tilting control assembly;Tilting buffer assembly includes pivot 3 and buffer elastic piece 8, third portion 103 is also rotatably connected with tail plate 2 by pivot 3, the both ends of buffer elastic piece 8 are connected with tail plate 2 and main seat 1 respectively and are configured to give buffer when tail plate 2 rotates backwards downwards;Tail plate 2 front part is equipped with extension, extension extends to the side of second portion 102 forwards, and extension is equipped with a plurality of locking positions, and locking position is configured to cooperate with tilting control assembly to realize the locking of tail plate 2 at different angles.

[0038] Main seat 1 is divided into three regions, i.e. first, second and third portions, each portion has its own function, and the components or assemblies in each portion can realize various functions, making the chassis complete in function;And the first and third portions are the front and rear parts of main seat 1, respectively, and the three portions form main seat 1 in its entirety, the dimensions of the three portions are comparable to the dimensions of the components or assemblies arranged therein, and the structure is compact and makes main seat 1 have no redundant parts, which on the one hand can effectively reduce the size of main seat 1, reduce material cost and transportation cost, and on the other hand make the structure simpler and the layout more intuitive, making production and assembly more convenient and after-sales maintenance more convenient.

[0039] Specifically, as shown, Figure 6 Main seat 1 is generally U-shaped, and the upper portion of main seat 1 has two seat mounting plates 13 arranged symmetrically left and right and extending outwardly from main seat 1, and the seat mounting plates 13 cover the first, second and third portions from front to back;Main seat 1 and seat mounting plates 13 are integrally formed, and seat mounting plates 13 are formed by bending;Extension is located below seat mounting plate 13, and extension is located on the front side of the rotating connection point of tail plate 2, and the upper end of extension has an inclined surface inclined from back to front;Main seat 1 includes a bottom plate 12 and two side plates 11 arranged left and right with a space therebetween, the side plates 11 are vertically arranged, the upper ends of the side plates 11 are connected with the seat mounting plates 13, and the lower ends of the side plates 11 are connected with the both ends of the bottom plate 12, and the side plates 11 are also formed by bending, and the seat mounting plates 13, the side plates 11 and the bottom plate 12 are integrally formed.

[0040] The tail plate 2 comprises a connecting plate 21 and two vertical rotating plates 22, which are arranged on the left and right sides of the connecting plate 21 and are located outside the main body seat 1, i.e., outside the side plate 11. The extension is located on one of the rotating plates 22 and is located outside the side plate 11. The rotating plate 22 is located outside the main body seat 1, and the extension is also located outside the main body seat 1, which can effectively avoid the structure inside the main body seat 1 and prevent motion interference.

[0041] As shown in Figure 1 , 2 , the first part 101 is located at the front side of the main body seat 1, and is specifically used for connecting the lifting air rod of the support base. The lifting control assembly is arranged in the first part 101. The first mounting seat 4 and the sleeve 5 for connecting the lifting air rod are arranged on the first part 101. The lifting control assembly comprises a pressing piece 6 rotatably arranged on the first mounting seat 4, which is located above the sleeve 5, and the rotation of the pressing piece 6 is controlled by the first pull wire 9.

[0042] As shown in Figure 1 , 10 , the third part 103 is located at the rear side of the main body seat 1, and the rotating shaft 3 thereon is used for connecting the tail plate 2. In addition, the buffer elastic member 8 provides buffer when the tail plate 2 rotates backward and downward, improving the comfort of the chair back when it is tilted backward. Further, the additional shaft 7 is arranged on the rotating shaft 3, the diameter of the additional shaft 7 is greater than that of the rotating shaft 3, and the buffer elastic member 8 is sleeved on the additional shaft 7. The rotating shaft 3 is relatively thin, and the inner diameter of the buffer elastic member 8 is relatively thick. The additional shaft 7 can fill the gap between the buffer spring and the rotating shaft 3. The material of the rotating shaft 3 is generally metal, which has strength requirements, and the material of the additional shaft 7 can be plastic, which saves cost. The second part 102 is fixedly provided with a blocking seat 145, and the tail plate 2 is provided with a supporting shaft 24. The buffer elastic member 8 is a spring, and the two ends of the buffer elastic member 8 are arranged on the blocking seat 145 and the supporting shaft 24 respectively. The front end of the buffer elastic member 8 is bent and inserted below the blocking seat 145, and the rear end of the buffer elastic member 8 is bent and abuts below the supporting shaft 24.

[0043] As shown in Figures 1-5 , the tilt control assembly arranged in the second part 102 comprises at least two lock pins 15 slidably arranged in the second part 102. Different lock pins 15 are arranged in parallel and spaced apart, and the axes of the lock pins 15 are arranged in the left-right direction. The extension is provided with at least two groups of the locking positions. The locking positions move with the rotation of the tail plate 2. Each group of locking positions corresponds to one lock pin 15, and the side view projection of the lock pin 15 is located on the movement path of the corresponding locking position, as shown in Figure 12The tilt control assembly further comprises a driving assembly configured to drive the sliding of the locking pins 15, and when any one of the locking pins 15 is aligned with the corresponding locking position, the driving assembly is capable of driving the locking pin 15 into the corresponding locking position; each group of locking positions is staggered in the height direction and the front-rear direction, and the locking pins 15 and the locking positions are configured such that only one locking pin 15 can enter its corresponding locking position at the same time, and different locking pins 15 entering the corresponding locking positions keep the tail plate 2 at different rotation angles; the existing chassis commonly uses a sliding sheet to realize tilting, which occupies a large internal space and makes the size of the chassis unable to be reduced; the sliding sheet can realize stepless locking, and the present scheme replaces it with gear locking, although the stepless effect is lost, but the length and thickness of the chassis in the front-rear direction can be reduced, greatly reducing the required materials and costs.

[0044] Further, the main seat 1 is used to connect the supporting base of the seat, such as a lifting air rod and a supporting foot, and the tail plate 2 is used to connect the back of the seat, and the rotation of the tail plate 2 on the main seat 1 is the tilting of the back of the seat; the locking positions are staggered in the front-rear direction and the height direction, the stagger in the front-rear direction is to correspond to the interval of the locking pins 15, and the stagger in the height direction is to lock the tail plate 2 at different rotation angles; the side view projection of the locking pin 15 is located on the movement path of the corresponding locking position, so that the locking position can be aligned with the locking pin 15 when the tail plate 2 rotates; when locking, only one locking pin 15 works at a time, and it is enough to lock the tail plate 2, and due to the arrangement of the locking positions, the tail plate 2 can be locked at multiple rotation angles, and different locking pins 15 work at different angles; through the arrangement of multiple locking pins 15 and multiple groups of locking positions, the large-angle multi-gear locking is realized, the overall height occupied by the locking positions is reduced, the size of the extension part is reduced, the material cost is reduced, the height direction between different locking positions is more compact, the gap between gears is smaller, the selection and adjustment are more delicate, and the use experience is improved.

[0045] Specifically, as shown in the drawings, Figures 7-9As shown in FIGS. 11, the driving assembly includes the first elastic member 16 and the second elastic member 17. The locking pin 15 is provided with a protruding portion 151 which protrudes radially from the locking pin 15. The first elastic member 16 and the second elastic member 17 are respectively located on two sides of the protruding portion 151. The first elastic member 16 is away from the second elastic member 17 relative to the extension portion. The first elastic member 16 always gives the locking pin 15 a spring force to move towards the extension portion. The second elastic member 17 always gives the locking pin 15 a spring force to move away from the extension portion. When the locking pin 15 enters the corresponding locking position, the first elastic member 16 is elongated, and the second elastic member 17 is compressed. When the locking pin 15 leaves the locking position, the first elastic member 16 is compressed, and the second elastic member 17 is elongated. The first elastic member 16 and the second elastic member 17 are cooperatively arranged to make the locking pin 15 in a floating state. The compression or elongation of the first and second elastic members can drive the locking pin 15 to move. When the locking pin 15 is blocked and stationary, the first and second elastic members can also provide a tendency to move. When the locking pin 15 is no longer blocked, it moves. The locking pin 15 can be directly controlled by a pull wire. Different locking pins 15 can be controlled respectively, but this is not the most preferred.

[0046] The driving assembly further includes a sliding block 19 which is slidingly arranged on the main body seat 1 in the left-right direction. The locking pin 15 is also inserted into the sliding block 19. The first elastic member 16 abuts against the sliding block 19. The other end of the first elastic member 16 abuts against the protruding portion 151. The second elastic member 17 abuts against the main body seat 1. The other end of the second elastic member 17 abuts against the protruding portion 151. The sliding block 19 is configured to simultaneously control the elongation or compression of the first elastic member 16. When the sliding block 19 slides away from the extension portion, the first elastic member 16 and the second elastic member 17 are both elongated. All the locking pins 15 slide away from the extension portion. The locking pins 15 located in the locking position leave the locking position. When the sliding block 19 slides towards the extension portion and any locking pin 15 is aligned with the corresponding locking position, the first elastic member 16 and the second elastic member 17 on the locking pin 15 are compressed. The locking pin 15 enters the locking position. The first elastic member 16 on the other locking pins 15 is also shortened. The sliding of the sliding block 19 is controlled by the second pull wire 10. Even if the pull wire is used for control, the overall cost of the chassis can be reduced. The pull wire control also increases the use experience.

[0047] The slider 19 slides away from the extension, and the locking pin 15 also needs to slide away from the extension to be unlocked, so the second elastic member 17 is definitely stretched, and after the second elastic member 17 is stretched, the elastic force becomes smaller, in order to maintain force balance, the elastic force of the first elastic member 16 also needs to become smaller, so the first elastic member 16 is also stretched, from here it can also be seen that the sliding distance of the slider 19 is greater than the sliding distance of the locking pin 15; similarly, after the locking pin 15 enters the locking position, the second elastic member 17 is compressed, so the elastic force becomes larger, in order to maintain force balance, the elastic force of the first elastic member 16 also needs to become larger, so the first elastic member 16 is also compressed; the locking pin 15 that is not aligned with the locking position is blocked by the extension and cannot move, and the first elastic member 16 on it is definitely compressed, and the second elastic member 17 is at least not stretched, that is, it may be compressed or not, depending on whether there is a gap between the end of the locking pin 15 and the extension when unlocking, if there is no gap, the length of the second elastic member 17 does not change, and generally there is a gap, the length of the second elastic member 17 will also be shortened, but at this time the elastic force of the first and second elastic members is definitely not in a state of force balance, and the locking pin 15 will be pushed by the first elastic member 16 to abut against the extension; further, when none of the locking pins 15 align with the locking positions, the slider 19 moves towards the extension, and the first elastic member 16 still always gives the locking pin 15 a sliding force towards the extension against the second elastic member 17, at this time, as long as the tail plate 2 is further rotated to align any locking pin 15 with its corresponding locking position, the locking pin 15 can enter the locking position under the action of the first elastic member 16 to complete the locking.

[0048] A third elastic member 18 is arranged between the slider 19 and the main body seat 1, one end of the third elastic member 18 abuts against the slider 19, and the other end abuts against the main body seat 1 on the side away from the extension, and the third elastic member 18 is configured to always give the slider 19 a sliding force towards the extension; in combination with the above scheme, the third elastic member 18 is sleeved on the second pull wire 10, and when the user operates, only unlocking can be operated by pulling the wire, and when the wire is loosened, it is switched to locking, and at this time, even if none of the locking pins 15 align with the locking positions, the tail plate 2 can be slightly rotated to align the locking pins 15 with the locking positions, thereby realizing delayed locking; during this process, the tail plate 2 can be rotated upward or downward, depending on the degree to which the user leans against the back of the chair.

[0049] The second part 102 is fixedly provided with a second mounting seat 14, the second mounting seat 14 comprises two sliding seat plates 141, the two sliding seat plates 141 are arranged at intervals in front and back, a sliding groove 143 is formed in the sliding seat plate 141, and the two sides of the sliding block 19 are each provided with an insertion block 191, the two insertion blocks 191 are slidably inserted into the sliding grooves 143 respectively; the blocking seat 145 is a part of the second mounting seat 14 and is located on the side away from the extension; the sliding seat plate 141 of the second mounting seat 14 is further provided with an open mouth 144, the open mouth 144 is communicated with the sliding groove 143, so that the insertion block 191 of the sliding block 19 is inserted into the sliding groove 143. The second mounting seat 14 further comprises an abutting plate 142, the sliding seat plate 141 is vertically arranged in the left-right direction, and the abutting plate 142 is vertically arranged in the front-rear direction; the abutting plate 142 is arranged close to the extension, the second elastic member 17 is in abutment with the abutting plate 142; the second elastic member 17 directly abuts against the main body seat 1 and needs a length, and the position of the abutting plate 142 is moderate, so that the elastic member is more easily controlled and the cost of the elastic member is saved.

[0050] More specifically, the locking pins 15 are two, and the locking positions are two groups in total; the first group of locking positions comprises a first locking position 231 and a third locking position 233, and the second group of locking positions comprises a second locking position 232; the first locking position 231 is located above the second locking position 232, and the third locking position 233 is located below the second locking position 232; the second locking position 232 is closer to the rotation connection point of the tail plate 2 than the first locking position 231 and the third locking position 233; the first locking position 231 is a notch, and the second locking position 232 and the third locking position 233 are both through holes; the first locking position 231 is a notch, and no hole needs to be opened, which not only simplifies production but also reduces the amount of material used.

[0051] As shown in the drawings, Figures 3-5 The length ratio of the main body seat 1 to the tail plate 2 in the front-rear direction is 0.75-1, and the length of the main body seat 1 in the front-rear direction is 130-140 mm; due to the above scheme, the structure inside the main body seat 1 is more compact, and the overall length of the main body seat 1 is smaller; in other words, compared with the conventional chassis, the length ratio of the main body seat 1 to the tail plate 2 is smaller, and in the embodiment, the tail plate 2 is of a conventional size, so the size of the main body seat 1 is obviously smaller; while ensuring the function is realized, the material consumption of the main body seat 1 is effectively reduced, and the material and packaging and transportation costs are reduced.

Claims

1. A multi-stage locking chassis, characterized by: The tail plate is rotationally arranged on the main body seat, and the front part of the tail plate is provided with an extension part which extends vertically and forwardly to the middle part of the main body seat. At least two locking pins are slidingly arranged on the main body seat, the different locking pins are arranged in parallel and at intervals, and the axes of the locking pins are arranged in the left-right direction. At least two groups of staggered locking positions are arranged on the extension part, the locking positions move with the rotation of the tail plate, each group of locking positions corresponds to one locking pin, and the side view projection of the locking pin is located on the movement path of the corresponding locking position. A driving assembly is further arranged in the main body seat, the driving assembly is configured to drive the locking pin to slide, and when any locking pin is aligned with the corresponding locking position, the driving assembly can drive the locking pin to enter the corresponding locking position. Each group of locking positions is staggered in the height direction and the front-rear direction, and the locking pin and the locking position are configured such that only one locking pin can enter its corresponding locking position at the same time, and different locking pins enter the corresponding locking position to keep the tail plate at different rotation angles.

2. The multi-stage latching chassis of claim 1, wherein: The driving assembly includes a first elastic member and a second elastic member, the locking pin is provided with a protruding part which protrudes radially from the locking pin, the first elastic member and the second elastic member are respectively located on both sides of the protruding part, the first elastic member is away from the extension part relative to the second elastic member, the first elastic member always gives the locking pin a spring force moving towards the extension part, and the second elastic member always gives the locking pin a spring force moving away from the extension part. When the locking pin enters the corresponding locking position, the first elastic member is elongated, and the second elastic member is compressed. When the locking pin leaves the locking position, the first elastic member is compressed, and the second elastic member is elongated.

3. The multi-stage latching chassis of claim 2, wherein: The driving assembly further includes a sliding block which is slidingly arranged on the main body seat in the left-right direction, the locking pin is further arranged in the sliding block, the first elastic member abuts against the sliding block, the other end of the first elastic member abuts against the protruding part, the second elastic member abuts against the main body seat, and the other end of the second elastic member abuts against the protruding part. The sliding block is configured to control the elongation or compression of the first elastic member at the same time. When the sliding block slides away from the extension part, the first elastic member and the second elastic member are elongated, all the locking pins slide away from the extension part, and the locking pins in the locking position leave the locking position. When the sliding block slides towards the extension part and any locking pin is aligned with the corresponding locking position, the first elastic member and the second elastic member on the locking pin are compressed, the locking pin enters the locking position, and the first elastic member on the other locking pins is also shortened.

4. The multi-stage latching chassis of claim 3, wherein: A third elastic member is arranged between the sliding block and the main body seat, one end of the third elastic member abuts against the sliding block, and the other end abuts against the main body seat on the side away from the extension part. The third elastic member is configured to always give the sliding block a spring force sliding towards the extension part.

5. The multi-stage latching chassis of claim 3, wherein: The sliding block is controlled by a pull wire.

6. The multi-stage latching chassis of claim 3, wherein: A mounting seat is fixedly arranged on the main body seat, the mounting seat includes two sliding seat plates which are arranged at intervals in the front-rear direction, and a sliding groove is formed in each sliding seat plate. Each side of the sliding block protrudes a plug, and the two plugs are slidingly arranged in the sliding grooves.

7. The multi-stage latching chassis of claim 6, wherein: The mounting seat further includes an abutting plate, the sliding seat plates are vertically arranged in the left-right direction, and the abutting plate is vertically arranged in the front-rear direction. The abutting plate is arranged close to the extension part, and the second elastic member abuts against the abutting plate.

8. The multi-stage latching chassis of claim 1, wherein: The lock pin has two, and the locking position has two groups; the first group of locking positions includes the first locking position and the third locking position, and the second group of locking positions includes the second locking position; the first locking position is located above the second locking position, and the third locking position is located below the second locking position; the second locking position is closer to the rotating connection point of the tail plate than the first locking position and the third locking position.

9. The multi-stage latching chassis of claim 8, wherein: The first locking position is a notch, and the second locking position and the third locking position are through holes.

10. The multi-stage latching chassis of claim 1, wherein: The tail plate includes a connecting plate and two vertical rotating plates, the two rotating plates are arranged on the left and right sides of the connecting plate and are spaced apart, and the rotating plates are located on the outer side of the main body seat, and the extension is located on one of the rotating plates, and the extension is located on the outer side of the main body seat.

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