seat pan

Abstract

The application discloses a seat chassis, which comprises a base, wherein the base is a semi-open box-shaped structure, the inside of the base is provided with front and rear support seats which are arranged at intervals, the front support seat is configured to be connected with a tail plate drive-by-wire unit, the rear side of the front support seat is rotationally connected with a pressing piece in the up-down direction, the rear support seat is configured to be connected with a lifting drive-by-wire unit, the bottom of the base is hollowed out to form an air pressure rod connecting hole, the air pressure rod connecting hole is configured to be connected with an air pressure rod, the air pressure rod connecting hole is located between the front support seat and the rear support seat, and the pressing piece is vertically opposite to the air pressure rod connecting hole, the lifting drive-by-wire unit comprises a drive-by-wire switch and a first pull rope, one end of the first pull rope is connected with the drive-by-wire switch, the other end of the first pull rope passes through the rear support seat and is connected with the pressing piece, a turning structure is arranged on the rear support seat, and the turning structure is configured to guide the movement direction of the first pull rope, so that when the drive-by-wire switch pulls the first pull rope, the first pull rope is guided by the turning structure to pull down the pressing piece.

Description

Technical Field

[0001] This utility model relates to the field of chassis technology, specifically to a seat chassis. Background Technology

[0002] The chassis is a crucial component of the seat, located at the bottom of the seat and connected to the backrest via a rotatable tailgate. It also connects to the gas spring at the bottom. Besides connecting the various components of the seat, the chassis also adjusts the seat height and backrest rotation. Common adjustment methods on the market include lever adjustment and cable control adjustment. Cable control adjustment is more convenient and widely favored by consumers.

[0003] For example, an existing patent provides a wired adjustment mechanism for a seat chassis (application number: CN202422585592.X), which includes a chassis, a fixed seat integrally formed on the chassis, a backrest adjustment mechanism rotatably connected to the fixed seat, and a lifting adjustment mechanism also installed on the fixed seat. The right end of the lifting adjustment mechanism is connected to the chassis, and the left side of the lifting adjustment mechanism is connected to a first pull cable for adjusting the lifting adjustment mechanism. The backrest adjustment mechanism is connected to a second pull cable for adjusting the backrest adjustment mechanism. The fixed seat includes an installation end and a pressing end that is close to the left side wall of the chassis. The first pull cable and the second pull cable both pass through the chassis from the pressing end. The pressing end has a first arc-shaped channel for pressing the first pull cable and allowing the first pull cable to pass through. The pressing end also has a second arc-shaped channel for pressing the second pull cable and allowing the second pull cable to pass through. An arc-shaped guide surface communicating with the second arc-shaped channel is also formed between the installation end and the pressing end. By setting an integrally molded fixed base, the installation process of the lifting adjustment mechanism and the backrest adjustment mechanism with the first and second pull cables is simplified, and better stability is achieved.

[0004] However, the above solution has the following problems: the integrated fixed seat occupies a large space in the width direction, which means that the chassis as a whole also needs to be set to a large width. This results in a large chassis space occupation, high processing and manufacturing costs, and it cannot be adapted to narrower chair seats. Moreover, due to space constraints, the first pull cable directly pulls the adjustment rod through the first arc channel, which has a limited guiding effect on the first pull cable, resulting in a relatively unsmooth operation of the chassis's wire-controlled adjustment. Summary of the Invention

[0005] In view of the aforementioned defects or deficiencies in the prior art, it is desirable to provide a seat chassis in which a gas spring is engaged with the base via a gas spring connection hole. Rotation of a pressing component activates a switch on the gas spring, thereby controlling the extension and retraction of the gas spring to adjust the seat height. Front and rear support seats are located on the front and rear sides of the gas spring connection hole. The front and rear support seats occupy relatively little space in the width direction, allowing for a narrower seat chassis and a more compact overall structure. Furthermore, the steering structure on the rear support seat guides the movement direction of the first pull rope, allowing for more flexible positioning of the lifting control unit, ensuring smooth and stable operation, and facilitating installation.

[0006] The effect of this utility model is achieved as follows: This application provides a seat chassis, including a base. The base is a semi-open box-shaped structure. Inside the base are a front support seat and a rear support seat spaced apart. The front support seat is configured to connect to a tailgate wire control unit, and a pressing member is rotatably connected to the rear side of the front support seat. The rear support seat is configured to connect to a lifting wire control unit. A gas spring connection hole is formed in the bottom of the base, which is configured to connect a gas spring and is located between the front and rear support seats. The pressing member is vertically aligned with the gas spring connection hole. The lifting wire control unit includes a wire control switch and a first pull rope. One end of the first pull rope is connected to the wire control switch, and the other end passes through the rear support seat and is connected to the pressing member. A steering structure is provided on the rear support seat, which is configured to guide the movement direction of the first pull rope, so that when the wire control switch pulls the first pull rope, the first pull rope is guided downward by the steering structure to pull the pressing member.

[0007] Furthermore, a first pulley is rotatably connected to the rear support base. The first pulley extends axially in the left-right direction. A first pull rope passes around the first pulley and is connected to the pressing member. The first pulley is configured to convert the movement of the first pull rope in the front-back direction into movement in the up-down direction. The first pulley guides the first pull rope to turn and supports its sliding, making the sliding process of the first pull rope more stable and smooth.

[0008] Furthermore, a second pulley is rotatably connected to the rear support. The second pulley extends axially in a vertical direction. The first pull rope passes around the second pulley and then around the first pulley. The second pulley is configured to convert the left-right movement of the first pull rope into a front-back movement. By guiding the first pull rope to turn and supporting the sliding of the second pulley, the sliding process of the first pull rope becomes more stable and smooth.

[0009] Furthermore, a front rotating groove is formed in the front recess of the rear support base, which is configured to connect to the first pulley. A side rotating groove is formed in the side recess of the rear support base, which is configured to connect to the second pulley. The front rotating groove connects to the side rotating groove. This results in a stronger connection between the first and second pulleys and the rear support base, and further improves the stability of the wired adjustment operation.

[0010] Furthermore, a front positioning groove with an upper opening is recessed on the side wall of the front rotating groove, and a first positioning part is protruded on the side wall of the first pulley. The first positioning part is engaged with the rear support seat through the front positioning groove, and the first positioning part rotates circumferentially within the front positioning groove. This results in a stronger connection between the rear support seat and the first pulley, greater stability of the seat chassis, and easier installation of the first pulley.

[0011] Furthermore, a side positioning groove with an upper opening is recessed in the side wall of the side rotation groove, and a second positioning part is protruded from the side wall of the second pulley. The second positioning part is engaged with the rear support seat through the side positioning groove, and the second positioning part rotates circumferentially within the side positioning groove. This results in a stronger connection between the rear support seat and the second pulley, greater stability of the seat chassis, and easier installation of the second pulley.

[0012] Furthermore, a torsion spring is installed between the pressing component and the front support seat. The elastic force of the torsion spring acts on the pressing component, causing it to always have an upward rotation tendency. This makes the wired adjustment operation of the seat chassis smoother.

[0013] Furthermore, the seat chassis also includes a tail plate, which is rotatably connected to the base. One side wall of the tail plate extends to form a rotating part. The rotating part has a hollowed-out design with multiple locking holes arranged in two rows along the vertical direction. The locking holes in the two rows are staggered. Two locking pins are slidably connected to the base along the left and right directions. The two locking pins are respectively aligned with the locking holes in the front and rear rows. The seat chassis has a locked and unlocked state. In the unlocked state, the locking pin moves away from the rotating part and avoids the locking hole, allowing the tailgate to rotate freely up and down relative to the base. In the locked state, the locking pin moves towards the rotating part, and one of the two locking pins engages with the corresponding locking hole, fixing the rotating part and the base relatively. This allows for two rows of staggered locking holes on the relatively low rotating part, enabling a tighter arrangement of the two sets of holes, reducing space usage, and allowing for more adjustable positions on the limited height of the rotating part, thus enhancing its practicality.

[0014] Furthermore, a movable component is slidably connected to the front support base along its left and right sides. This movable component has two connecting components, one at the front and one at the rear, which are capable of elastic deformation. Two locking pins are connected to these connecting components respectively. The movable component drives the locking pins to slide left and right through the connecting components. This allows the gear adjustment mechanism to stably perform gear adjustment even with two locking pins, resulting in a compact structure and strong practicality.

[0015] Furthermore, the tailgate control unit includes an adjustment switch and a second pull rope. One end of the second pull rope is connected to the adjustment switch, and the other end passes through the front support and is connected to the movable part. The adjustment switch is configured to move the movable part left and right by pulling the second pull rope, making chassis adjustment operations more convenient.

[0016] The seat chassis provided in this application has a gas spring that is snapped into the base via a gas spring connection hole. Rotation of the pressing component activates a switch on the gas spring, thereby controlling the extension and retraction of the gas spring to adjust the seat height. Front and rear support seats are located on the front and rear sides of the gas spring connection hole. The front and rear support seats occupy relatively little space in the width direction, allowing for a narrower seat chassis and a more compact overall structure. Furthermore, the steering structure on the rear support seat guides the movement of the first pull rope, enabling more flexible positioning of the lifting control unit, ensuring smooth and stable operation, and facilitating installation. 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 This is a three-dimensional structural diagram of the seat chassis provided in an embodiment of this application; Figure 2 This is a schematic diagram of the internal structure of the seat chassis provided in an embodiment of this application; Figure 3 A three-dimensional structural diagram of the base provided in the embodiments of this application; Figure 4 A schematic diagram of the connection structure between the front support, the rear support, and the base provided in the embodiments of this application; Figure 5 A schematic diagram of the connection structure between the rear support base and the lifting wire control unit provided in the embodiments of this application; Figure 6 A schematic diagram of the connection structure between the rear support and the steering structure provided in the embodiments of this application; Figure 7 A schematic diagram of the connection structure between the front support base and the tailgate wire control unit provided in the embodiments of this application; Figure 8 This is a schematic diagram illustrating the movement of the seat chassis provided in an embodiment of this application.

[0018] The reference numerals in the attached drawings are as follows: 1-base, 101-pneumatic rod connection hole, 102-through hole, 2-front support seat, 201-slide groove, 3-rear support seat, 301-front rotating groove, 302-side rotating groove, 303-front positioning groove, 304-side positioning groove, 310-first pulley, 311-first positioning part, 320-second pulley, 321-second positioning part, 4-pressing part, 401-torsion spring, 5-wire control switch, 510-first pull rope, 6-tail plate, 610-rotating part, 611-locking hole, 7-locking pin, 8-moving part, 810-connecting part, 9-adjustment switch, 910-second pull rope, 10-rear plate, 11-support plate. 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 1-8 This application provides a seat chassis, including a base 1. The base 1 is a semi-open box-shaped structure. Inside the base 1 are a front support 2 and a rear support 3 spaced apart. The front support 2 is configured to connect to a tailgate wire control unit, and a pressing member 4 is rotatably connected to the rear side of the front support 2. The rear support 3 is configured to connect to a lifting wire control unit. A gas spring connection hole 101 is formed in the bottom of the base 1, configured to connect a gas spring, and the gas spring connection hole 101 is located at the front support... Between the support 2 and the rear support 3, the pressing member 4 is vertically aligned with the gas rod connection hole 101; the lifting wire control unit includes a wire control switch 5 and a first pull rope 510. One end of the first pull rope 510 is connected to the wire control switch 5, and the other end passes through the rear support 3 and is connected to the pressing member 4. The rear support 3 is provided with a steering structure, which is configured to guide the movement direction of the first pull rope 510, so that when the wire control switch 5 pulls the first pull rope 510, the first pull rope 510 is guided downward by the steering structure to pull the pressing member 4.

[0021] In this embodiment, after the gas spring is engaged with the base 1 through the gas spring connection hole 101, the switch bolt on the gas spring is pressed by rotating the pressing member 4, thereby controlling the extension and retraction of the gas spring to adjust the seat height. The front support 2 and the rear support 3 are distributed on the front and rear sides of the gas spring connection hole 101. The front support 2 and the rear support 3 occupy less space in the width direction, which allows the seat chassis to be set narrower and the overall structure to be more compact. Moreover, the steering structure on the rear support 3 guides the movement direction of the first pull rope 510, which allows the position of the lifting wire control unit to be set more freely, ensuring smooth and stable wire control operation and making installation more convenient.

[0022] Please refer to the attached document. Figure 4-6 In some embodiments of this application, a first pulley 310 is rotatably connected to the rear support 3. The first pulley 310 extends axially in a left-right direction. A first pull rope 510 passes around the first pulley 310 and is connected to the pressing member 4. The first pulley 310 is configured to convert the movement of the first pull rope 510 in a front-back direction into movement in a vertical direction. The first pulley 310 guides the first pull rope 510 to turn and supports the sliding of the first pull rope 510, making the sliding process of the first pull rope 510 more stable and smooth.

[0023] Please refer to the attached document. Figure 4-6 In some embodiments of this application, a second pulley 320 is rotatably connected to the rear support 3. The axial direction of the second pulley 320 extends in the vertical direction. The first pull rope 510 passes around the second pulley 320 and then around the first pulley 310. The second pulley 320 is configured to convert the movement of the first pull rope 510 in the left-right direction into movement in the front-back direction.

[0024] In this embodiment, the second pulley 320 guides the first pull rope 510 to turn and supports the sliding of the second pulley 320, making the sliding process of the first pull rope 510 more stable and smooth. Furthermore, the first pull rope 510 passes through the side wall of the chassis 1, goes around the second pulley 320, then around the first pulley 320 again, and finally connects to the pressing member 4. That is, by means of the steering structure, the sliding of the first pull rope 510 in the left-right direction is converted into movement in the up-down direction, resulting in a smooth transmission process.

[0025] Please refer to the attached document. Figure 6In some embodiments of this application, a front rotation groove 301 is formed in the front recess of the rear support 3, which is configured to connect the first pulley 310. A side rotation groove 302 is formed in the side recess of the rear support 3, which is configured to connect the second pulley 320. The front rotation groove 301 communicates with the side rotation groove 302. By installing the first pulley 310 in the front rotation groove 301 and the second pulley 320 in the side rotation groove 302, the connection strength between the first pulley 310, the second pulley 320, and the rear support 3 is higher. Furthermore, since the rotation groove 301 communicates with the side rotation groove 302, the first pull rope 510 can pass through the rear support 3 and connect with the pressing member 4, further improving the stability of the wired adjustment operation.

[0026] Please refer to the attached document. Figure 6 In some embodiments of this application, a front positioning groove 303 with an upper opening is recessed on the side wall of the front rotating groove 301, and a first positioning part 311 is protruded on the side wall of the first pulley 310. The first positioning part 311 is engaged with the rear support seat 3 through the front positioning groove 303, and the first positioning part 311 rotates in its own circumference within the front positioning groove 303.

[0027] In this embodiment, the engagement between the first positioning part 311 and the front positioning groove 303 enhances the connection strength between the rear support 3 and the first pulley 310, resulting in greater stability of the seat chassis. Furthermore, the first positioning part 311 can be inserted into the opening on the upper side of the front positioning groove 303, simplifying the installation of the first pulley 310. After the first positioning part 311 rotates into the bottom of the front positioning groove 303, a transverse pivot connects the first pulley 310 to the rear support.

[0028] Please refer to the attached document. Figure 6 In some embodiments of this application, a side positioning groove 304 with an upper opening is recessed on the side wall of the side rotation groove 302, and a second positioning part 321 is protruded on the side wall of the second pulley 320. The second positioning part 321 is engaged with the rear support seat 3 through the side positioning groove 304, and the second positioning part 321 rotates in its own circumference within the side positioning groove 304.

[0029] In this embodiment, the engagement of the second positioning part 321 and the side positioning groove 304 enhances the connection strength between the rear support 3 and the second pulley 320, resulting in greater stability of the seat chassis. Furthermore, the second positioning part 321 can be inserted into the opening on the upper side of the side positioning groove 304, simplifying the installation of the second pulley 320. After the second positioning part 321 is inserted into the bottom of the side positioning groove 304, a transverse pivot connects the second pulley 320 to the rear support.

[0030] Please refer to the attached document. Figure 7In some embodiments of this application, a torsion spring 401 is provided between the pressing member 4 and the front support seat 2. The elastic force of the torsion spring 401 acts on the pressing member 4, causing the pressing member 4 to always have an upward rotation tendency. After the seat is adjusted to a suitable height, releasing the wired control switch 5 releases the first pull rope 510, causing the pressing member 4 to automatically rotate upward under the elastic force of the torsion spring 401, thereby releasing the switch bolt of the gas spring and fixing the seat at the current height. This makes the wired adjustment operation of the seat chassis smoother.

[0031] Please refer to the attached document. Figure 2 and attached Figure 8 In some embodiments of this application, the seat chassis also includes a tail plate 6, which is rotatably connected to the base 1. One side wall of the tail plate 6 extends to form a rotating part 610. The rotating part 610 has a plurality of locking holes 611 arranged in two rows along the vertical direction, and the locking holes 611 in the front and rear rows are staggered. The base 1 is slidably connected with two locking pins 7 in the left and right directions, and the two locking pins 7 are respectively aligned with the locking holes 611 in the front and rear rows. The seat chassis has a locked state and an unlocked state. In the unlocked state, the locking pin 7 moves away from the rotating part 610 and avoids the locking hole 611, and the tail plate 6 can rotate freely up and down relative to the base 1. In the locked state, the locking pin 7 moves towards the rotating part 610, and one of the front and rear locking pins 7 is engaged in the locking hole 611 on the corresponding side, and the rotating part 610 and the base 1 are relatively fixed.

[0032] In this embodiment, by setting two sets of staggered locking holes 611, two rows of staggered locking holes 611 can be set on the rotating part 610 with a relatively low height. The two sets of locking holes 611 can be arranged more closely and occupy less space. Furthermore, the base 1 is provided with two locking pins 7 that engage with the locking holes 611. In the locked state, one of the two locking pins 7 engages with the corresponding locking hole 611. That is, even when multiple locking holes 611 are staggered, the locking pins 7 can also engage with any locking hole 611. This allows for more adjustable positions to be set on the rotating part 610 with limited height, making it highly practical.

[0033] Preferably, the rotating part 610 is provided with four staggered locking holes 611, meaning the backrest has four adjustable tilt positions, providing a high degree of adjustment freedom and strong practicality. Of course, in other embodiments of this application, the number of locking holes 611 on the rotating part 610 can also be three, five, six, etc.

[0034] Please refer to the attached document. Figure 2-3In some embodiments of this application, a movable member 8 is slidably connected to the front support 2 along the left and right directions. The movable member 8 is provided with two connecting members 810 at the front and rear. The connecting members 810 have elastic deformation capability. Two locking pins 7 are respectively connected to the connecting members 810 at the front and rear sides. The movable member 8 drives the locking pins 7 to slide left and right through the connecting members 810.

[0035] In this embodiment, the movable part 8 on the base 1 is connected to the locking pins 7 on the front and rear sides respectively through two connecting parts 810. In the locked state, when the two locking pins 7 move towards the rotating part 610, only one locking pin 7 is aligned with the corresponding locking hole 611. When the other locking pin 7 slides to abut against the side wall of the rotating part 610, with the help of the elastic deformation of the connecting part 810, the locking pin 7 on one side can slide further to be engaged in the locking hole 611, while the locking pin 7 on the other side is tightly pressed against the side wall of the rotating part 610 by the movement allowance generated by the deformation of the connecting part 810. Thus, the gear adjustment mechanism can still stably realize the gear adjustment function even with two locking pins 7, with a compact structure and strong practicality.

[0036] The base 1 has two through holes 102 on its side wall. The rotating part 610 of the tail plate 6 fits against the side wall of the base 1, and one of the two through holes 102 is aligned with the locking hole 611. In the locked state, the two locking pins 7 pass through the through holes 102 on the front and rear sides respectively, and one of the locking pins 7 is engaged in the locking hole 611, thereby connecting and fixing the tail plate 6 and the base 1.

[0037] Preferably, a torsion spring is fixed to the side wall of the movable part 8 by screws, the middle section of the torsion spring is fixed to the movable part 8, and the two arms of the torsion spring extend beyond the movable part 8 to form two connecting parts 810 at the front and rear. This not only has a simple structure, but also makes installation more convenient.

[0038] Please refer to the attached document. Figure 3 and attached Figure 7 In some embodiments of this application, the tailgate wire control unit includes an adjustment switch 9 and a second pull rope 910. One end of the second pull rope 910 is connected to the adjustment switch 9, and the other end passes through the front support 2 and is connected to the movable member 8. The adjustment switch 9 is configured to pull the movable member 8 to slide left and right through the second pull rope 910.

[0039] In this embodiment, the movable part 8 is supported by the front support seat 2 for movement operation, and the movable part 8 is connected by the second pull rope 910 on the adjustment switch 9. That is, the user only needs to press the adjustment switch 9 on the seat and pull or release the second pull rope 910 to move the movable part 8 left and right, thereby causing the locking pin 7 to engage or avoid the locking hole 611, making the adjustment operation of the chassis more convenient.

[0040] The front support 2 has a recessed groove 201 on its side wall. The movable part 8 is slidably connected to the front support 2 via the groove 201. A spring is also installed in the groove 201. The spring force acts on the movable part 8, causing the movable part 8 to always tend to move towards the rotating part 610. This also causes the locking pin 7 connected to the movable part 8 to always tend to engage with the locking hole 611, further improving the convenience and stability of the chassis adjustment operation.

[0041] Please refer to the appendix. Figure 8 The seat chassis also includes a support plate 10 and a rear plate 11. The bottom of the rear plate 11 is hinged to the rear end of the base 1. The support plate 10 is configured to connect to the seat, and the front end of the support plate 10 is hinged to the tail plate 6. The rear end of the base plate 9 is hinged to the top of the rear plate 11. This allows the support plate 10, rear plate 11, base 1, and tail plate 6 to be hinged together to form a structure similar to a four-bar linkage. When the tail plate 6 rotates, it will cause the rear plate 11 to rotate synchronously, which in turn will cause the top support plate 10 to slide back and forth synchronously. In other words, when the backrest rotates, the seat will slide synchronously, giving the seat the function of adapting to the rotation of the backrest and sliding accordingly, thus improving the support experience of the seat.

[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 seat chassis, characterized in that, The system includes a base (1), which is a semi-open box-shaped structure. Inside the base (1) are a front support seat (2) and a rear support seat (3) spaced apart. The front support seat (2) is configured to connect to the tail plate wire control unit, and a pressing part (4) is rotatably connected to the rear side of the front support seat (2). The rear support seat (3) is configured to connect to the lifting wire control unit. The bottom of the base (1) has a hollowed-out pneumatic rod connection hole (101), which is configured to connect a pneumatic rod. The pneumatic rod connection hole (101) is located between the front support seat (2) and the rear support seat (3). The pressing member (4) is vertically aligned with the gas rod connection hole (101); the lifting wire control unit includes a wire control switch (5) and a first pull rope (510). One end of the first pull rope (510) is connected to the wire control switch (5), and the other end passes through the rear support seat (3) and is connected to the pressing member (4). The rear support seat (3) is provided with a steering structure, which is configured to guide the movement direction of the first pull rope (510) so that when the wire control switch (5) pulls the first pull rope (510), the first pull rope (510) is guided downward by the steering structure to pull the pressing member (4).

2. The seat chassis according to claim 1, characterized in that, The rear support (3) is rotatably connected to a first pulley (310), the first pulley (310) extends axially in the left-right direction, the first pull rope (510) passes around the first pulley (310) and is connected to the pressing member (4), and the first pulley (310) is configured to convert the movement of the first pull rope (510) in the front-back direction into the movement in the up-down direction.

3. The seat chassis according to claim 2, characterized in that, The rear support (3) is rotatably connected to a second pulley (320), the second pulley (320) extends axially in the up-down direction, the first pull rope (510) passes around the second pulley (320) and then around the first pulley (310), the second pulley (320) is configured to convert the movement of the first pull rope (510) in the left-right direction into movement in the front-back direction.

4. The seat chassis according to claim 3, characterized in that, The front side recess of the rear support (3) forms a front rotation groove (301), the front rotation groove (301) is configured to connect the first pulley (310), the side wall recess of the rear support (3) forms a side rotation groove (302), the side rotation groove (302) is configured to connect the second pulley (320), and the front rotation groove (301) communicates with the side rotation groove (302).

5. The seat chassis according to claim 4, characterized in that, The front rotating groove (301) has a recessed front positioning groove (303) with an upper opening on its side wall. The first pulley (310) has a protruding first positioning part (311) on its side wall. The first positioning part (311) is engaged with the rear support seat (3) through the front positioning groove (303), and the first positioning part (311) rotates in its own circumference within the front positioning groove (303).

6. The seat chassis according to claim 4, characterized in that, The side wall of the side rotation groove (302) is recessed to form a side positioning groove (304) with an upper opening. The side wall of the second pulley (320) is protruding to form a second positioning part (321). The second positioning part (321) is engaged with the rear support seat (3) through the side positioning groove (304), and the second positioning part (321) rotates in its own circumference within the side positioning groove (304).

7. The seat chassis according to claim 1, characterized in that, A torsion spring (401) is provided between the pressing member (4) and the front support seat (2). The elastic force of the torsion spring (401) acts on the pressing member (4), so that the pressing member (4) always has an upward rotation tendency.

8. The seat chassis according to claim 1, characterized in that, The seat chassis also includes a tail plate (6), which is rotatably connected to the base (1). One side wall of the tail plate (6) extends to form a rotating part (610). The rotating part (610) has a plurality of locking holes (611) arranged in two rows along the vertical direction. The locking holes (611) in the two rows are staggered. The base (1) is slidably connected with two locking pins (7) in the left and right directions. The two locking pins (7) are respectively aligned with the locking holes (611) in the front and rear rows. The seat chassis has a locked state and an unlocked state. In the unlocked state, the locking pin (7) moves away from the rotating part (610) and avoids the locking hole (611), and the tail plate (6) can rotate freely up and down relative to the base (1). In the locked state, the locking pin (7) moves towards the rotating part (610), and one of the two locking pins (7) at the front and rear engages with the locking hole (611) on the corresponding side, and the rotating part (610) and the base (1) are relatively fixed.

9. The seat chassis according to claim 8, characterized in that, The front support base (2) is slidably connected to a movable part (8) along the left and right directions. The movable part (8) is provided with two connecting parts (810) at the front and rear. The connecting parts (810) have elastic deformation capability. The two locking pins (7) are respectively connected to the connecting parts (810) at the front and rear sides. The movable part (8) drives the locking pins (7) to slide left and right through the connecting parts (810).

10. The seat chassis according to claim 9, characterized in that, The tailgate wire control unit includes an adjustment switch (9) and a second pull rope (910). One end of the second pull rope (910) is connected to the adjustment switch (9), and the other end passes through the front support seat (2) and is connected to the movable part (8). The adjustment switch (9) is configured to pull the movable part (8) to slide left and right by the second pull rope (910).

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