Gear adjustment mechanism and chassis

Abstract

This application discloses a gear adjustment mechanism and chassis, including a support member, a movable member, and locking pins. The movable member is rotatably mounted relative to the support member. The movable member has multiple locking holes arranged in two rows vertically, with the locking holes staggered. Two locking pins are slidably connected to the base along its left-right orientation, aligning with the locking holes in the front and rear rows respectively. The gear adjustment mechanism has a locked state and an unlocked state. In the unlocked state, the locking pins move away from the movable member and avoid the locking holes, allowing the movable member to rotate freely relative to the support member. In the locked state, the locking pins move towards the movable member, and one of the two locking pins engages with the corresponding locking hole, fixing the movable member and support member relatively. The gear adjustment mechanism and chassis provided in this application, by setting two sets of staggered locking holes, allow for a more compact arrangement of the locking holes, occupying less space and enabling the movable member to have more gears, thus enhancing its practicality.

Description

Technical Field

[0001] This utility model relates to the field of seating technology, specifically to a gear adjustment mechanism and chassis. Background Technology

[0002] The chassis is the core component that supports the seat structure. Its top is connected to the seat, its bottom is connected to the gas spring, and its backrest is connected to the rotatable tailgate. Its main functions are to adjust the seat height, the backrest tilt angle, and to provide elastic support. Its performance directly affects the sitting experience.

[0003] To support multiple tilt adjustments for the backrest, traditional chassis typically have a tilt adjustment mechanism on the tailplate. One side wing of the tailplate has several vertically arranged locking holes. Inside the chassis is a sliding locking pin controlled by an adjustment rod or a wired switch. When the backrest rotates, the tailplate rotates synchronously. When the desired angle is reached, the locking pin engages with the corresponding locking hole, fixing the angle of the tailplate and thus fixing the backrest at the current tilt angle.

[0004] However, traditional chassis have the following problems: the overall height of the base is low, meaning that the space available for opening a lock hole on the side of the tailgate is narrow. This results in traditional chassis having only about three tilt positions that can be adjusted, with low degree of adjustment freedom, which cannot meet the usage needs of various users. Summary of the Invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a gear adjustment mechanism and chassis. By setting two sets of lock holes arranged in a staggered manner, the two sets of lock holes can be arranged more closely in the vertical direction, occupying less space. Furthermore, the support member is provided with two locking pins that engage with the lock holes. In the locked state, one of the two locking pins engages with the corresponding lock hole. This allows the gear adjustment mechanism to have more adjustable gears on a moving part with limited height, making it more practical.

[0006] The effect of this utility model is achieved as follows: In a first aspect, this application provides a gear adjustment mechanism, including a support member, a movable member and a locking pin. The movable member is rotatably arranged relative to the support member. The movable member has a plurality of locking holes arranged in two rows along the vertical direction, and the locking holes in the two rows are staggered. Two locking pins are slidably connected to the base along the left and right directions, and the two locking pins are respectively aligned with the locking holes in the front and rear rows. The gear adjustment mechanism has a locked state and an unlocked state. In the unlocked state, the locking pin moves away from the moving part and avoids the lock hole, and the moving part can rotate freely up and down relative to the support. In the locked state, the locking pin moves towards the moving part, and one of the front and rear locking pins engages with the lock hole on the corresponding side, and the moving part and the support are relatively fixed.

[0007] Secondly, this application provides a chassis including a tailgate and a gear adjustment mechanism. The tailgate is configured to connect to a backrest, and a support member is configured to connect to a gas spring. The tailgate is rotatably connected to the support member, and one side wall of the tailgate extends to form a movable member. A locking member is slidably connected to the base along the left-right direction. The locking member is provided with two first elastic members, one at the front and one at the back, which have elastic deformation capabilities. Two locking pins are respectively connected to the first elastic members on the front and back sides. The locking member drives the locking pins to slide left and right through the first elastic members. The movable member with a lower height can be provided with two rows of staggered locking holes, making the locking holes more closely arranged. The backrest can have more adjustable tilt positions, making it more practical. Furthermore, the gear adjustment mechanism can still stably achieve gear adjustment function even with two locking pins. The structure is ingenious and highly practical.

[0008] Furthermore, an adjusting rod is slidably connected to the support member along its left and right sides. One end of the adjusting rod is connected to the locking member, and the other end protrudes from the support member and is equipped with an adjusting handle. The user can pull the adjusting handle to engage or disengage the locking pin in the lock hole, making the adjustment of the chassis more convenient.

[0009] Furthermore, the adjusting rod can rotate circumferentially relative to the support member, and a lifting adjustment component is sleeved on the adjusting rod. This lifting adjustment component is configured to rotate with the adjusting rod and press down or avoid the switch bolt on the pneumatic rod. This not only further improves the convenience of chassis adjustment operations but also enriches the chassis's functionality, making it more practical.

[0010] Furthermore, the tailplate and the support are rotatably connected via a horizontally arranged pivot. The locking component has slotted holes along its left and right sides, allowing it to fit onto the pivot and slide left and right along the pivot's axis. This enhances the connection strength between the locking component and the support, and improves the stability of the locking component's sliding adjustment operation.

[0011] Furthermore, a second elastic element is provided on the pivot shaft. The elastic force of the second elastic element acts on the locking element, causing the locking element to always tend to move towards the moving element. This further improves the convenience and stability of chassis adjustment operations.

[0012] Furthermore, a mounting base is fixedly connected to the support member, and a movable groove is recessed in the side wall of the mounting base. The locking member is slidably connected to the mounting base through the movable groove. A rotary wire-controlled adjustment mechanism is provided on the chassis. The rotary wire-controlled adjustment mechanism includes a rotary adjustment switch and a first pull rope. One end of the first pull rope is connected to the rotary adjustment switch, and the other end passes through the mounting base and is connected to the locking member. The rotary adjustment switch is configured to pull the locking member left and right by the first pull rope. This makes the adjustment operation of the chassis more convenient.

[0013] Furthermore, a third elastic element is also provided within the movable slot. The elastic force of the third elastic element acts on the locking element, ensuring that the locking element always tends to move towards the movable element. This further enhances the convenience and stability of chassis adjustment operations.

[0014] Furthermore, the mounting base is rotatably connected to a rotating component, and the chassis is equipped with a lifting wire-controlled adjustment mechanism. This mechanism includes a lifting adjustment switch and a second pull rope. One end of the second pull rope is connected to the lifting adjustment switch, and the other end is connected to the rotating component. The lifting adjustment switch is configured to pull the rotating component up and down via the second pull rope, pressing down or avoiding the switch bolt on the gas spring. This not only simplifies the lifting adjustment operation of the chassis but also further enriches the chassis's functionality, enhancing its practicality.

[0015] Furthermore, the chassis also includes a base plate and a transmission component. The bottom of the transmission component is hinged to the rear end of the support component. The base plate is configured to connect to the seat, with its front end hinged to the rear plate and its rear end hinged to the top of the transmission component. This allows the seat to have an adaptive adjustment function, ensuring that the backrest and seat support surfaces always maintain a position that conforms to the curves of the user's back and hips, thereby effectively improving the seat's support experience.

[0016] The gear adjustment mechanism and chassis provided in this application, by setting two sets of lock holes arranged in a staggered manner, allow the two sets of lock holes to be arranged more closely in the vertical direction, occupying less space. Furthermore, the support member is provided with two locking pins that engage with the lock holes. In the locked state, one of the two locking pins engages with the lock hole on the corresponding side. That is, even when multiple lock holes are arranged in a staggered manner, the locking pins can also engage with any lock hole. This allows the gear adjustment mechanism to have more adjustable gears on a moving part with limited height, making it highly practical. Attached Figure Description

[0017] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 A three-dimensional structural diagram of the base when using the adjustment rod, provided for an embodiment of this application; Figure 2 This is a schematic diagram of the internal structure of the base when using the adjusting rod, provided in an embodiment of this application. Figure 3 This is a schematic diagram of the internal structure of the support member when using the adjusting rod, provided in an embodiment of this application. Figure 4 A schematic diagram of the connection structure between the support member and the tail plate when using the adjusting rod, provided in an embodiment of this application; Figure 5 This is a schematic diagram of the connection structure between the adjusting rod and the locking member provided in an embodiment of this application; Figure 6 A three-dimensional structural diagram of the base when using a rotation-controlled adjustment mechanism, as provided in an embodiment of this application; Figure 7 This is a schematic diagram of the internal structure of the base when using a rotation-controlled adjustment mechanism, as provided in an embodiment of this application. Figure 8 This is a schematic diagram of the internal structure of the support member when using a rotation-controlled adjustment mechanism, as provided in an embodiment of this application. Figure 9 A schematic diagram of the connection structure between the support member and the tail plate when using a rotation-controlled adjustment mechanism according to an embodiment of this application; Figure 10 This is a schematic diagram of the internal structure of the rotation-by-wire adjustment mechanism provided in the embodiments of this application; Figure 11 This is a schematic diagram illustrating the state changes of the gear adjustment mechanism when the tailgate rotates, as provided in an embodiment of this application.

[0018] The reference numerals in the attached drawings are as follows: 1-Support member, 101-Connecting hole, 110-Rotating shaft, 111-Second elastic member, 2-Tail plate, 210-Moving member, 211-Locking hole, 3-Locking pin, 4-Locking member, 401-Socket hole, 410-First elastic member, 420-Connecting part, 5-Adjusting rod, 510-Adjusting handle, 520-Lifting adjustment member, 6-Mounting base, 601-Moving groove, 602-Third elastic member, 610-Rotating member, 7-Rotation adjustment switch, 710-First pull rope, 8-Lifting adjustment switch, 810-Second pull rope, 9-Base plate, 10-Transmission member, 11-Cover. Detailed Implementation

[0019] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings.

[0020] Please refer to the attached document. Figure 1-11 This application provides a gear adjustment mechanism, including a support member 1, a movable member 210 and a locking pin 3. The movable member 210 is rotatably arranged relative to the support member 1. The movable member 210 has a plurality of locking holes 211 arranged in two rows along the vertical direction, and the locking holes 211 in the front and rear rows are staggered. The support member 1 is slidably connected with two locking pins 3 in the left and right directions, and the two locking pins 3 are respectively aligned with the locking holes 211 in the front and rear rows. The gear adjustment mechanism has a locked state and an unlocked state. In the unlocked state, the locking pin 3 moves away from the movable part 210 and avoids the lock hole 211, and the movable part 210 can rotate freely up and down relative to the support 1. In the locked state, the locking pin 3 moves towards the movable part 210, and one of the two locking pins 3 is engaged in the lock hole 211 on the corresponding side, and the movable part 210 and the support 1 are relatively fixed.

[0021] In this embodiment, as shown in the appendix Figure 11 As shown, by setting two sets of lock holes 211 arranged in a staggered manner, the two sets of lock holes 211 can be arranged more closely in the vertical direction, occupying less space. Furthermore, the support member 1 is provided with two locking pins 3 that engage with the lock holes 211. In the locked state, one of the two locking pins 3 engages with the corresponding lock hole 211. That is, even when multiple lock holes 211 are arranged in a staggered manner, the locking pins 3 can also engage with any lock hole 211. This allows the gear adjustment mechanism to have more adjustable gears on the movable part 210 with limited height, making it highly practical.

[0022] Please refer to the attached document. Figure 1-10 This application embodiment also provides a chassis, including a tailgate 2 and a gear adjustment mechanism. The tailgate 2 is configured to connect to a backrest, and the support member 1 is configured to connect to a gas spring. The tailgate 2 is rotatably connected to the support member 1, and one side wall of the tailgate 2 extends to form a movable member 210. A locking member 4 is slidably connected to the support member 1 along the left and right directions. The locking member 4 is provided with two first elastic members 410 at the front and rear. The first elastic members 410 have elastic deformation capability. Two locking pins 3 are respectively connected to the first elastic members 410 at the front and rear sides. The locking member 4 drives the locking pins 3 to slide left and right through the first elastic members 410.

[0023] In this embodiment, by applying the gear adjustment mechanism to the chassis, both the support member 1 and the tail plate 2 of the chassis are sheet metal parts. The lower movable member 210 can be provided with two rows of staggered locking holes 211, making the locking holes 211 more closely arranged. The backrest can have more adjustable tilt positions, making it more practical. Furthermore, the locking member 4 on the support member 1 is connected to the locking pins 3 on the front and rear sides respectively through two first elastic members 410. In the locked state, when the two locking pins 3 move towards the movable member 210, only one side of the locking pin 3 is aligned with the corresponding locking hole 211. When the other side of the locking pin 3 slides to abut against the side wall of the movable member 210, with the help of the elastic deformation of the first elastic member 410, the locking pin 3 on one side can slide further to be engaged in the locking hole 211, while the locking pin 3 on the other side is tightly pressed against the side wall of the movable member 210 by the movement allowance generated by the deformation of the first elastic member 410. This allows the gear adjustment mechanism to stably achieve gear adjustment even with two locking pins 3, resulting in a sophisticated structure and strong practicality.

[0024] The support member 1 has a U-shaped sheet metal structure. The side wall of the support member 1 has two connecting holes 101, one at the front and one at the back. The movable part 210 of the tail plate 2 fits against the side wall of the support member 1, and one of the two connecting holes 101 is aligned with the lock hole 211. In the locked state, the two locking pins 3 pass through the connecting holes 101 on the front and back sides respectively, and one of the locking pins 3 is engaged in the lock hole 211, thereby connecting and fixing the tail plate 2 and the support member 1.

[0025] Preferably, a torsion spring is fixed to the side wall of the locking member 4 by screws. The middle section of the torsion spring is fixed to the locking member 4, and the two arms of the torsion spring extend beyond the locking member 4 to form two first elastic members 410 at the front and rear. This not only has a simple structure, but also makes installation relatively convenient.

[0026] Preferably, the movable component 210 is provided with four staggered locking holes 211, meaning the backrest has four adjustable tilt positions, offering a high degree of adjustment freedom and strong practicality. Of course, in other embodiments of this application, the number of locking holes 211 on the movable component 210 can also be three, five, six, etc.

[0027] Please refer to the attached document. Figure 1-5 In some embodiments of this application, an adjusting rod 5 is slidably connected to the support member 1 along the left and right directions. One end of the adjusting rod 5 is connected to the locking member 4, and the other end extends out of the support member 1 and is provided with an adjusting handle 510.

[0028] In this embodiment, the adjusting rod 5 drives the locking member 4 to slide. One end of the adjusting rod 5 that protrudes from the support member 1 is provided with an adjusting handle 510 for the user to adjust. The user can pull the adjusting handle to drive the locking pin 3 to engage or avoid the lock hole 211, making the adjustment operation of the chassis more convenient.

[0029] Please refer to the attached document. Figure 3-5 In some embodiments of this application, the adjusting rod 5 can rotate circumferentially relative to the support member 1. A lifting adjusting member 520 is sleeved on the adjusting rod 5. The lifting adjusting member 520 is configured to rotate together with the adjusting rod 5 and press down or avoid the switch bolt on the gas spring. The adjusting rod 5 can not only drive the locking pin 3 to move and switch the state of the gear adjustment mechanism, but also drive the lifting adjusting member 520 to rotate together, thereby pressing down or avoiding the switch bolt on the gas spring to realize the lifting adjustment of the seat. This not only further improves the convenience of chassis adjustment operation, but also further enriches the function of the chassis and makes it more practical.

[0030] Please refer to the attached document. Figure 3-5In some embodiments of this application, the tail plate 2 and the support member 1 are rotatably connected by a laterally arranged rotating shaft 110. The locking member 4 has a socket hole 401 hollowed out along the left and right sides. The locking member 4 is sleeved on the rotating shaft 110 through the socket hole 401 and can slide left and right along the axial direction of the rotating shaft 110. This restricts the sliding direction of the locking member 4, so that the locking member 4 can only slide along the axial direction of the rotating shaft 110, which makes the connection strength between the locking member 4 and the support member 1 higher and the sliding adjustment operation of the locking member 4 more stable.

[0031] Please refer to the attached document. Figure 3-4 In some embodiments of this application, a second elastic element 111 is provided on the rotating shaft 110. The elastic force of the second elastic element 111 acts on the locking element 4, causing the locking element 4 to always tend to move towards the movable element 210. This also causes the locking pin 3 connected to the locking element 4 to always tend to engage with the lock hole 211. This not only ensures that the locking pin 3 can stably engage with the lock hole 211 in the locked state, resulting in stronger connection stability, but also that in the unlocked state, the locking element 4 compresses the second elastic element 111, causing elastic deformation. This allows the locking element 4 to automatically push out with the help of the restoring elastic force of the second elastic element 111 when switching back to the locked state. Therefore, the convenience and stability of the chassis adjustment operation are further improved.

[0032] Preferably, the second elastic element 111 is a spring, which not only has strong elasticity, but also can be directly sleeved onto the rotating shaft 110 for installation, making it convenient to install and remove.

[0033] In this application, in addition to adjustment using the adjustment lever 5, the chassis can also be adjusted using a wired adjustment method: Please refer to the attached document. Figure 6-10 In some embodiments of this application, a mounting base 6 is fixedly connected to the support member 1. A movable groove 601 is recessed on the side wall of the mounting base 6. The locking member 4 is slidably connected to the mounting base 6 through the movable groove 601. A rotation wire control adjustment mechanism is provided on the chassis. The rotation wire control adjustment mechanism includes a rotation adjustment switch 7 and a first pull rope 710. One end of the first pull rope 710 is connected to the rotation adjustment switch 7, and the other end passes through the mounting base 6 and is connected to the locking member 4. The rotation adjustment switch 7 is configured to pull the locking member 4 to slide left and right through the first pull rope 710.

[0034] In this embodiment, the locking member 4 is supported by the mounting base 6 for operation, and the locking member 4 is connected by the first pull rope 710 on the rotary adjustment switch 7. That is, the user only needs to press the rotary adjustment switch 7 on the chair seat to pull or release the first pull rope 710, and the locking member 4 can be moved left and right by the first pull rope 710, thereby causing the locking pin 3 to engage or avoid the lock hole 211, making the adjustment operation of the chassis more convenient.

[0035] Please refer to the attached document. Figure 8-10 In some embodiments of this application, a third elastic element 602 is also provided in the movable groove 601. The elastic force of the third elastic element 602 acts on the locking element 4, causing the locking element 4 to always tend to move towards the movable element 210. This also causes the locking pin 3 connected to the locking element 4 to always tend to engage with the lock hole 211. This not only ensures that the locking pin 3 can stably engage with the lock hole 211 in the locked state, resulting in stronger connection stability, but also that in the unlocked state, the locking element 4 compresses the third elastic element 602, causing elastic deformation. This allows the locking element 4 to automatically push out with the help of the reset elastic force of the third elastic element 602 when switching back to the locked state. Therefore, the convenience and stability of the chassis adjustment operation are further improved.

[0036] Preferably, the locking member 4 includes a columnar connecting part 420, and the third elastic member 602 is a spring. The third elastic member 602 is sleeved on the connecting part 420 and is inserted into the movable groove 602 together with the connecting part 420, so that the third elastic member 602 has a simple structure, low cost, and is easy to install and operate.

[0037] Please refer to the attached document. Figure 8-10 In some embodiments of this application, the mounting base 6 is rotatably connected to a rotating component 610, and a lifting wire control adjustment mechanism is provided on the chassis. The lifting wire control adjustment mechanism includes a lifting adjustment switch 8 and a second pull rope 810. One end of the second pull rope 810 is connected to the lifting adjustment switch 8, and the other end is connected to the rotating component 610. The lifting adjustment switch 8 is configured to pull the rotating component 610 up and down through the second pull rope 810, and press down or avoid the switch bolt on the pneumatic rod.

[0038] In this embodiment, by setting up a lifting wire control adjustment mechanism, the user only needs to press the lifting adjustment switch 8 to pull the second pull rope 810 and drive the rotating part 610 to rotate, thereby pressing down or avoiding the switch bolt on the gas spring to realize the lifting adjustment of the seat. This not only makes the lifting adjustment operation of the chassis more convenient, but also further enriches the function of the chassis and makes it more practical.

[0039] Please refer to the attached document. Figure 11 In some embodiments of this application, the chassis further includes a base plate 9 and a transmission member 10. The bottom of the transmission member 10 is hinged to the rear end of the support member 1. The base plate 9 is configured to connect to the seat. The front end of the base plate 9 is hinged to the tail plate 2, and the rear end of the base plate 9 is hinged to the top of the transmission member 10.

[0040] In this embodiment, the base plate 9, transmission component 10, support component 1, and tail plate 2 are hinged together to form a structure similar to a four-bar linkage. When the tail plate 2 rotates, it drives the transmission component 10 to rotate synchronously, which in turn causes the base plate 9 to slide back and forth synchronously. Specifically, when the backrest rotates backward, the seat slides backward, and when the backrest rotates forward, the seat slides forward. This gives the seat an adaptive adjustment function, ensuring that the support surfaces of the backrest and seat always conform to the curves of the user's back and hips, thus effectively improving the seat's support experience.

[0041] The bottom of the base plate 9 is also covered with a cover 11, which is configured to cover the support 1 and gear adjustment mechanism inside the chassis, making the appearance more integrated and protecting the internal structure.

[0042] It should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used above to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means three or more.

[0043] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A gear adjustment mechanism, characterized in that, It includes a support member (1), a movable member (210), and a locking pin (3). The movable member (210) is rotatably arranged relative to the support member (1). The movable member (210) has a plurality of locking holes (211) arranged in two rows along the vertical direction, and the locking holes (211) in the two rows are staggered. The support member (1) is slidably connected with two locking pins (3) in the left and right directions. The two locking pins (3) are respectively aligned with the locking holes (211) in the front and rear rows. The gear adjustment mechanism has a locked state and an unlocked state. In the unlocked state, the locking pin (3) moves away from the movable part (210) and avoids the lock hole (211), and the movable part (210) can rotate freely up and down relative to the support (1). In the locked state, the locking pin (3) moves towards the movable part (210), and one of the two locking pins (3) is engaged in the lock hole (211) on the corresponding side, and the movable part (210) and the support (1) are relatively fixed.

2. A chassis, characterized in that, The device includes a tailplate (2) and a gear adjustment mechanism as described in claim 1. The tailplate (2) is configured to connect to a backrest, and the support member (1) is configured to connect to a pneumatic rod. The tailplate (2) is rotatably connected to the support member (1) and one side wall of the tailplate (2) extends to form the movable member (210). A locking member (4) is slidably connected to the support member (1) along the left and right directions. The locking member (4) is provided with two first elastic members (410) at the front and rear. The first elastic members (410) have elastic deformation capability. The two locking pins (3) are respectively connected to the first elastic members (410) at the front and rear sides. The locking member (4) drives the locking pins (3) to slide left and right through the first elastic members (410).

3. The chassis according to claim 2, characterized in that, An adjusting rod (5) is slidably connected to the support member (1) along the left and right sides. One end of the adjusting rod (5) is connected to the locking member (4), and the other end extends out of the support member (1) and is provided with an adjusting handle (510).

4. The chassis according to claim 3, characterized in that, The adjusting rod (5) can rotate around itself relative to the support (1). A lifting adjusting member (520) is sleeved on the adjusting rod (5). The lifting adjusting member (520) is configured to rotate together with the adjusting rod (5) and press down or avoid the switch bolt on the pneumatic rod.

5. The chassis according to claim 2, characterized in that, The tail plate (2) and the support member (1) are rotatably connected by a horizontally arranged pivot (110). The locking member (4) has a socket hole (401) hollowed out along the left and right sides. The locking member (4) is sleeved on the pivot (110) through the socket hole (401) and can slide left and right along the axis of the pivot (110).

6. The chassis according to claim 5, characterized in that, A second elastic element (111) is provided on the rotating shaft (110). The elastic force of the second elastic element (111) acts on the locking element (4), so that the locking element (4) always has a tendency to move toward the movable element (210).

7. The chassis according to claim 2, characterized in that, A mounting base (6) is fixedly connected to the support member (1). A movable groove (601) is recessed on the side wall of the mounting base (6). The locking member (4) is slidably connected to the mounting base (6) through the movable groove (601). A rotation wire control adjustment mechanism is provided on the chassis. The rotation wire control adjustment mechanism includes a rotation adjustment switch (7) and a first pull rope (710). One end of the first pull rope (710) is connected to the rotation adjustment switch (7), and the other end passes through the mounting base (6) and is connected to the locking member (4). The rotation adjustment switch (7) is configured to pull the locking member (4) to slide left and right through the first pull rope (710).

8. The chassis according to claim 7, characterized in that, A third elastic element (602) is also provided in the movable groove (601). The elastic force of the third elastic element (602) acts on the locking element (4), so that the locking element (4) always has a tendency to move toward the movable element (210).

9. The chassis according to claim 7, characterized in that, The mounting base (6) is rotatably connected to a rotating component (610). The chassis is provided with a lifting wire control adjustment mechanism. The lifting wire control adjustment mechanism includes a lifting adjustment switch (8) and a second pull rope (810). One end of the second pull rope (810) is connected to the lifting adjustment switch (8), and the other end is connected to the rotating component (610). The lifting adjustment switch (8) is configured to pull the rotating component (610) up and down through the second pull rope (810) and press down or avoid the switch bolt on the pneumatic rod.

10. The chassis according to claim 2, characterized in that, The chassis also includes a base plate (9) and a transmission component (10). The bottom of the transmission component (10) is hinged to the rear end of the support component (1). The base plate (9) is configured to connect to the seat. The front end of the base plate (9) is hinged to the tail plate (2). The rear end of the base plate (9) is hinged to the top of the transmission component (10).

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