Seat chassis convenient to adjust

Abstract

The utility model relates to a seat chassis convenient to adjust, which realizes the adjustment of the inclination degree of a seat backrest by arranging a gear adjusting mechanism on a base. The sliding block is connected with the gear adjusting mechanism through an elastic reset assembly so that the sliding block can be driven to always slide to the gear-adjusted position in the sliding groove along with adjustment of the gear adjusting mechanism by a user. According to the scheme, the sliding block is connected with the gear adjusting mechanism through the elastic reset assembly, and through cooperation of all the components, the inclination degree of the seat backrest can be adjusted no matter when a user backs on the seat backrest or when the user does not lean on the seat backrest. After a user locks the gear adjusted by the current gear adjusting mechanism, namely, the inclination degree of the seat backrest is adjusted. The positions of the shifting block and the sliding block are always relatively fixed, that is, the shifting piece of the shifting block is always kept in the opening of the limiting part.

Description

Technical Field

[0001] The utility model relates to the technical field of seat accessories, in particular to a conveniently adjustable seat chassis. Background Art

[0002] Generally, a seat comprises a base, and a device for adjusting the inclination of a seat back is generally installed on the existing seat base to provide a more ergonomic and comfortable sitting posture for the user.

[0003] The common way to adjust the tilt of the seat back is generally to adjust it through a knob or a wired control device. At present, most of the chassis of swivel chairs on the market are adjusted by an adjustment handle installed on the outside of the mechanism to adjust the lifting or tilting and locking. This adjustment method requires the user to bend over to touch the adjustment handle under the seat, which is laborious and inconvenient to use. Therefore, wired adjustment is generally used for adjustment.

[0004] For example, the Chinese utility model patent with publication number CN216020116U and patent name "A wire-controlled adjustment device for a seat" can achieve multi-level adjustment of the backrest angle by rotating the rotating shaft. The operation is convenient and helpful in meeting the user's different needs for the seat reclining angle. When the rotating shaft is rotated in the reverse direction, the cooperation between the gear and the rack can make the first adjustment rope move smoothly, so that the reverse adjustment of the backrest angle can also be carried out smoothly.

[0005] Although it solves the problem of smoothly adjusting the backrest angle, this wire-controlled adjustment device has a complex structure and is inconvenient to adjust. It cannot adjust the seat back while the user is leaning against the seat back and applying external force. The adjustment can only be performed by driving the rotating shaft by wire control without external force, that is, when the user is not leaning against the seat back. The wire-controlled adjustment device of this structure is cumbersome to operate in adjusting the tilt degree of the seat back, increases the difficulty of adjustment, cannot provide users with better comfort, and has poor practicality.

[0006] Therefore, how to overcome the above-mentioned defects has become an important issue to be solved urgently by those skilled in the art. Utility Model Content

[0007] The utility model overcomes the shortcomings of the above-mentioned technology and provides a conveniently adjustable seat chassis.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A conveniently adjustable seat chassis comprises a base, the base is provided with a gear adjustment mechanism, the base is also symmetrically provided with two slide grooves, a slider is slidably connected in the slide groove, and a limit block is connected to the outer wall of the slider; the slider is connected to the gear adjustment mechanism through an elastic reset component, so that the slider can always follow the user's adjustment of the gear adjustment mechanism and slide in the slide groove to the position after the gear is adjusted.

[0010] Furthermore, a slide rail embedded in a slide groove is provided at the bottom of the slider, a cavity is provided in the slider, and slide holes are provided on the side walls of the two symmetrical surfaces of the sliders, and a limiting portion is provided in the middle of the slider to divide the cavity into a first cavity and a second cavity, and the elastic reset assembly includes a first elastic member respectively installed in the first cavity and the second cavity, a guide rod is sleeved in the first elastic member, and the guide rod includes a pressing head and a rod portion, one end of the pressing head abuts against the limiting portion, and the other end abuts against the first elastic member, and first through holes for the rod portion of the guide rod to pass through are respectively provided at the upper and lower ends of the slider, and the other end of the first elastic member abuts against the inner wall of the cavity facing the first through hole.

[0011] Furthermore, the gear adjustment mechanism includes a shift block, a fixed seat fixedly connected to the base and covering the shift block and the slider, the upper end of the shift block extends into the fixed seat, and the left and right ends respectively extend into the sliders on both sides, the shift block includes shift pieces symmetrically arranged at its left and right ends, and the limiting portion is provided with an opening for the shift piece to pass through, and the shift piece passes through the sliding hole and then extends into the opening to simultaneously drive the rod portion of the guide rod in the first cavity or the second cavity to pass through the first through hole.

[0012] Furthermore, a guide through hole is provided on the fixing seat, an elastic clip is provided on the upper end of the shift block, and a plurality of first recesses are provided on at least one side of the hole wall of the guide through hole. The elastic clip extends into the guide through hole and can be snapped into / out of the first recess under the drive of the shift block.

[0013] Furthermore, the elastic clamping part includes a base fixedly connected to the shift block, a movable part elastically connected to the base, a guide channel with an open end and a closed end is provided in the base, a second elastic part is installed in the guide channel, and the movable part is embedded in the opening of the base and pressed against the second elastic part so as to be snapped into / out of the first recess under the drive of the shift block.

[0014] Furthermore, the first notch is an arc-shaped notch, and the movable member is a spherical body matched with the inner diameter of the guide channel so that the movable member can roll at the opening of the base when the movable member is inserted into / released from the first notch.

[0015] Furthermore, the base is provided with connecting columns, each of which has a threaded channel. The fixing seat is provided with a threaded hole, in which a screw is installed. The screw passes through the threaded hole and then enters the threaded channel in the connecting column to connect and fix the fixing seat to the base.

[0016] Furthermore, the connecting column includes a first connecting column and a second connecting column, the first connecting column is arranged between the two sliders, and the first connecting column is arranged on the path of the slider sliding upward to prevent the slider from sliding upward excessively, and the slider is provided with a second recess on the side facing the first connecting column; the second connecting column is symmetrically arranged in two and is respectively arranged on the outer sides of the two sliders, and the second connecting column is arranged on the path of the slider sliding downward to prevent the slider from sliding downward excessively.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The present invention discloses a conveniently adjustable seat chassis, which realizes the adjustment of the tilt degree of the seat back by setting a gear adjustment mechanism on the base. The slider is connected to the gear adjustment mechanism through an elastic reset component, so as to drive the slider to always follow the user's adjustment of the gear adjustment mechanism and slide in the slide groove to the position after the gear is adjusted. The slider of the present invention is connected to the gear adjustment mechanism through an elastic reset component, and through the cooperation between various components, the tilt degree of the seat back can be adjusted whether the user is leaning on the seat back or not. Specifically, when the user is leaning on the seat back, the limit block is pressed down by the backrest and does not move, so that the slider is fixed. At this time, the user can still adjust the gear by driving the gear adjustment mechanism. After the user adjusts the corresponding gear, the user only needs to leave the backrest. Since the force applied to the limit block disappears, under the action of the elastic reset component, the slider slides in the slide groove to the position after the user adjusts the gear. When the user does not lean against the seat back, the limit block will not be held up by the pressed back, that is, the slider can move freely. At this time, it is only necessary to drive the gear adjustment mechanism to adjust the gear. Similarly, under the action of the elastic reset component, the slider slides in the slide groove to the position after the user adjusts the gear. The seat chassis of this structure in this case can be simple in structure and easy to adjust. Whether the user is leaning against the seat back to apply external force or not leaning against the seat back, the tilt of the seat back can be easily adjusted, which brings better comfort to the user and is practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an exploded view of the overall structure of this case.

[0020] Figure 2 This is a three-dimensional diagram of this case.

[0021] Figure 3 This is a schematic diagram of the structure after removing the fixing seat in this case.

[0022] Figure 4 It is an exploded schematic diagram of the slider and elastic reset component structure of this case.

[0023] Figure 5 This is an assembly diagram of the slider and elastic return component of one of the cases.

[0024] Figure 6 This is a schematic diagram of the disassembly of the gear adjustment mechanism structure in this case.

[0025] Figure 7 It is a cross-sectional view of the gear adjustment mechanism structure in the AA direction of this case. DETAILED DESCRIPTION

[0026] The following examples further illustrate the features of the present invention and other related features to facilitate understanding by those skilled in the art:

[0027] like Figures 1 to 7 As shown, the present invention discloses a conveniently adjustable seat chassis, including a base 100, on which two slide grooves 101 are symmetrically arranged. It should be noted that in the present invention, the two slide grooves 101 are symmetrically arranged, that is, the two slide grooves 101 have the same structure size and length. In order to save production costs, the slide groove 101 and the base 100 are integrally formed and manufactured, which can shorten the production time. A slider 1 is slidably connected in the slide groove 101, and a limit block 11 is connected to the outer wall of the slider 1; a gear adjustment mechanism is provided on the base 100 to adjust the inclination degree of the seat back. Preferably, the limit block 11 is integrally formed with the slider 1, which can effectively prevent the limit block 11 from being held by the pressed backrest and detaching from the slider 1 when the user leans on the chair back during daily use. Of course, it can also be fixedly connected by screw connection or other fixed connection methods, provided that the stability of the connection between the two needs to be guaranteed. In specific implementation, the gear adjustment mechanism can be set with multiple gears to meet the different needs of users. The slider 1 is connected to the gear adjustment mechanism through an elastic reset component, so that the slider 1 can always follow the user's adjustment of the gear adjustment mechanism and slide in the slide groove 101 to the position after the gear is adjusted. In this case, preferably, the two slide grooves 101 are vertically arranged in the center of the base 100, so that it is convenient to assemble the base 100 with other parts of the seat so that there is more space on both sides of the slide groove when it is installed on the seat, and there will be no interference with the slider and the gear adjustment mechanism of this case. It is also convenient to better and more stably realize the function of adjusting the tilt degree of the seat back. The slider 1 is connected to the gear adjustment mechanism through an elastic reset component, so that the slider 1 can always follow the user's adjustment of the gear adjustment mechanism and slide in the slide groove 101 to the position after the gear is adjusted.

[0028] like Figure 1-5 As shown, in order to facilitate the sliding block 1 to stably slide in the slide groove 101 and further enhance the stability of the adjustment of the tilt degree of the seat back, a slide rail 12 embedded in the slide groove 101 is provided at the bottom of the sliding block 1 in this case. In specific implementation, the slide rail 12 is designed to be in a shape that matches the slide groove 101, but its length needs to be less than the length of the slide groove 101, so that it can be embedded in the slide groove 101 and stably slide in the slide groove 101. The specific length of the slide rail 12 can be adaptively adjusted according to the length required for the gear adjustment of the gear adjustment mechanism in specific implementation.

[0029] like Figure 1-5 For details, please refer to Figure 3 Figure 4 , a cavity 13 is provided in the slider 1, and sliding holes 14 are provided on the side walls of the symmetric planes of the two sliders 1. The side wall of the symmetric plane is also the side wall on which the two sliders 1 face each other. The setting of the sliding hole 14 facilitates the connection between the gear adjustment mechanism and the slider 1, and allows the gear adjustment mechanism to slide therein. A limiting portion 15 is provided in the middle of the slider 1 to divide the cavity 13 into a first cavity 131 and a second cavity 132. In specific implementation, the slider 1 is preferably in the shape of a rectangular parallelepiped, so that it can slide more stably on the base, and it is also convenient for the adjustment of the gear adjustment mechanism. The cavity 13 is equivalent to a structure in which the slider 1 is hollow inside.

[0030] like Figure 1-5 For details, please refer to Figure 3 Figure 4 The elastic reset assembly includes a first elastic member 2 installed in a first cavity 131 and a second cavity 132, respectively. A guide rod 3 is sleeved inside the first elastic member 2. The guide rod 3 includes a pressing head 31 and a rod portion 32. One end of the pressing head 31 abuts against the limit portion 15, and the other end abuts against the first elastic member 2. The upper and lower ends of the slider 1 are respectively provided with first through holes 16 for the rod portion 32 of the guide rod 3 to pass through. The other end of the first elastic member 2 abuts against the inner wall of the cavity 13 toward the first through hole 16. In a specific implementation, the limit portion 15 is located in the middle of the slider 1, dividing the cavity 13 into a first cavity 131 and a second cavity 132 of the same size. In this case, preferably, the cavity 13 is divided into a first cavity 131 and a second cavity 132, so that two identical elastic reset components are installed in the slider 1. If there is only one through cavity 13, only one elastic reset component can be installed, and its adjustment stroke is large, resulting in a large reset stroke of the spring reset component. Such a disadvantage is that the stability of the adjustment of the tilt degree of the seat back is poor. When adjusting, it is easy to shake greatly, affecting the comfort of the human body, and it is also easy to damage the seat chassis of this case. In specific implementation, the first elastic member 2 is a compression spring.

[0031] like Figure 1-Figure 3 , Figure 6 , 7 As shown, the gear adjustment mechanism includes a shift block 4, a fixed seat 5 fixedly connected to the base 100 and covering the shift block 4 and the slider 1. The fixed seat covers the sliders 1 on both sides to further ensure the stability of the slider 1 sliding in the slide groove 11, and can effectively prevent the slider 1 from slipping out of the slide groove 11. The upper end of the shift block 4 extends into the fixed seat 5, and the left and right ends extend into the sliders 1 on both sides respectively. The shift block 4 includes shift pieces 41 symmetrically arranged at its left and right ends. The limiting portion 15 is provided with an opening 151 for the shift piece 41 to pass through. After the shift piece 41 penetrates the slide hole 14, it extends into the opening 151 to simultaneously drive the rod portion 32 of the guide rod 3 in the first cavity 131 or the second cavity 132 to penetrate the first through hole 16. It should be noted that the shift block 4 and the shift piece 41 are integrally formed, and the structure, shape and size of the shift pieces 41 at both ends are consistent. When the user uses the gear adjustment mechanism to adjust the tilt of the seat back, the shift block 4 slides in the slide hole 14 to simultaneously drive the guide rod 3 in the first cavity 131 of the sliders 1 on both sides to pass through the first through hole 16 on the corresponding side, and at this time, the first elastic member 2, that is, the compression spring, is in a compressed state. Of course, the guide rod 3 in the second cavity 132 of the sliders 1 on both sides can also be driven to pass through the first through hole 16 on the corresponding side, and at this time, the first elastic member 2, that is, the compression spring, is in a compressed state.

[0032] like Figure 1-Figure 3 , Figure 6 , 7 As shown, a guide through hole 51 is provided on the fixing seat 5, an elastic clamping member 42 is provided on the upper end of the shift block 4, and at least one side of the hole wall of the guide through hole 51 is provided with a plurality of first notches 511 arranged at intervals. The aperture of the guide through hole 51 and the number of the first notches 511 determine the adjustment of the tilt angle of the seat back by the gear adjustment mechanism. In specific implementation, the aperture of the guide through hole 51 and the number of the first notches 511 can be selected according to actual needs and on the premise of being more in line with human comfort. The elastic clamping member 42 extends into the guide through hole 51 and can be inserted into / out of the first notch 511 under the drive of the shift block 4. When the elastic clamping member 42 is inserted into each different first notch 511, it corresponds to each gear of the gear adjustment mechanism. In specific implementation, the driving method of the shift block 4 can be a common wire control driving method in the prior art, or a handle rotation, or other driving mechanism, etc., as long as the shift block 4 can be stably driven to perform corresponding actions. In this case, the preferred driving mode for the shift block 4 is drive-by-wire.

[0033] like Figure 1-Figure 3 , Figure 6 , 7 For details, see Figure 6 , Figure 7The elastic clamping member 42 includes a base 421 fixedly connected to the shift block 4 and a movable member 422 elastically connected to the base 421. The elastic clamping member 42 includes a fixed connection mode between the base 421 and the shift block 4, and the two are preferably cast in one piece to ensure the stability of the connection between the two. A guide channel 4211 with an opening at one end and a closed end at the other end is provided in the base 421, and a second elastic member 423 is installed in the guide channel 4211. In a specific implementation, the second elastic member 423 is a compression spring. The movable member 422 is embedded in the opening of the base 421 and pressed against the second elastic member 423 so as to be inserted into / out of the first recess 511 under the drive of the shift block 4. When the driving block 4 moves in the guide through hole 51, along the hole wall of the guide through hole 51, the movable member 422 is continuously retracted into / extended from the guide channel 4211 under the action of the second elastic member 423 during the movement of the block 4. When the movable member 422 is inserted into the corresponding first notch 511, the gear position currently adjusted by the gear adjustment mechanism is locked. This structural design makes the adjustment of the gear adjustment mechanism more convenient and easy.

[0034] like Figure 1-Figure 3 , Figure 6 , 7 For details, see Figure 6 , Figure 7 In this case, the first notch 511 is an arc-shaped notch, and the movable member 422 is a spherical body that matches the inner diameter of the guide channel 4211 so that the movable member 422 can roll at the opening of the base 421 when the movable member 422 is inserted into / out of the first notch 511. The movable member 422 of this shape cooperates with the second elastic member 423, making it easier for the movable member 422 to be inserted into / out of the first notch 511, thereby further making it more convenient and easy to adjust the gear adjustment mechanism.

[0035] like Figure 1-Figure 3 As shown, in order to stably connect the fixing seat 5 to the base 100, a connecting column 102 is further provided on the base 100. The connecting column 102 is integrally formed with the base 100, and a threaded channel is provided in the connecting column 102. A threaded hole 1020 is provided on the fixing seat 5, and a screw 6 is installed in the threaded hole 1020. The screw 6 passes through the threaded hole 1020 and then penetrates into the threaded channel in the connecting column 102 to connect and fix the fixing seat 5 to the base 100. The fixing seat 5 is connected and fixed to the base 100 through the connecting column 102, which can further ensure the stability of the sliding block 1 in the sliding groove 11, and can effectively prevent the sliding block 1 from falling out of the sliding groove 11. At the same time, the stability of the gear adjustment mechanism is further improved, specifically, the shift block 4 is more stable when it moves in the guide through hole 51 in the fixing seat 5.

[0036] like Figure 1-Figure 3As shown, further, the connecting column 102 includes a first connecting column 1021 and a second connecting column 1022. The first connecting column 1021 is arranged between the two sliders 1, and the first connecting column 1021 is arranged on the path of the shift block 4 sliding upward to prevent the shift block 4 from sliding upward excessively. The second notch 43 is opened on the side of the shift block 4 facing the first connecting column 1021. Specifically, the first connecting column 1021 is installed on the base 100 at a position between the first cavities 131 of the two sliders 1. The arrangement of the second notch 43 on the shift block 4, on the one hand, facilitates increasing the path of the shift block 4 sliding upward and limits the stroke of the path of the shift block 4 sliding upward; on the other hand, it plays a buffering role to prevent the side wall of the shift block 4 from directly contacting the first connecting column 1021 when the gear adjustment mechanism is used for adjustment, thereby accelerating the wear between the parts and shortening the service life. The second connecting column 1022 is symmetrically arranged, and is respectively arranged on the outside of the two sliders 1, and the second connecting column 1022 is arranged on the path of the slider 1 sliding downward to prevent the slider 1 from sliding downward excessively. Specifically, the second connecting column 1022 is respectively arranged on the outside of the two sliders 1, and is directly opposite to the limit block 11 on the slider 1. When the slider 1 slides downward, the limit block 11 abuts against the second connecting column 1022, thereby limiting the travel of the upward sliding path of the shift block 4. This structural design fixes the maximum tilt degree when the seat back is adjusted.

[0037] The working principle of this case is:

[0038] When the user leans back against the backrest, the limit block 11 is held against the backrest by the downward pressure, so that the slider 1 is fixed. At this time, the user can still move in the guide hole 51 by driving the shift block 4. For example, the user drives the shift block 4 to slide upward in the slide hole 14, so that the shift pieces 41 on both sides of the shift block 4 pass upward through the opening 151 on the limit portion 15, and then press against the top pressure head 31 of the guide rod 3 in the first cavity 131 of the sliders 1 on both sides, thereby simultaneously driving the rod portion 32 of the guide rod 3 to pass upward through the first through hole 16 on the corresponding side. At this time, the first elastic member 2, that is, the compression spring, is in a compressed state. At the same time, the shift block 4 interacts along the hole wall of the guide hole 51 in the guide hole 51. During the movement of the shift block 4, the movable member 422 is continuously retracted / extended into the guide channel 4211 under the action of the second elastic member 423. When the movable member 422 is inserted into the corresponding first notch 511, the gear adjusted by the current gear adjustment mechanism is locked. After the gear is locked, the user only needs to leave the backrest. Since the external force applied to the limit block 11 disappears, the first elastic member 2, that is, the compression spring, begins to reset. Under the action of the elastic force of the first elastic member 2, the slider 1 slides in the slide groove 101 to the position after the user adjusts the gear. At this time, the paddle 41 of the paddle block 4 returns to the initial position, that is, returns to the opening 151 on the limit portion 15.

[0039] When the user leans back on the chair back, if the user drives the dial block 4 to slide upward in the slide hole 14, that is, when adjusting downward, the dial block 4 drives the dial 41 to enter the second cavity 132. The specific working principle is referred to the above working principle, and only the movement direction of the relevant components is different, which will not be repeated here.

[0040] When the user does not lean against the seat back, the limit block 11 will not be pressed against the backrest, and the slider 1 can slide freely. At this time, it is only necessary to drive the gear adjustment mechanism to adjust the gear accordingly. Similarly, under the action of the elastic reset component, the slider slides in the slide groove to the position after the user adjusts the gear. Please refer to the above working principle for details, which will not be repeated here.

[0041] Finally, it should be noted that in this case, after the user locks the gear adjusted by the gear adjustment mechanism, that is, after the adjustment of the tilt degree of the seat back is completed, the positions of the shift block 4 and the slider 1 are always relatively fixed, that is, the shift piece 41 of the shift block 4 always remains in the opening 151 of the limit portion 15.

[0042] As mentioned above, this case protects a conveniently adjustable seat chassis. All technical solutions that are the same or similar to this case should be considered to fall within the protection scope of this case.

Claims

1. A conveniently adjustable seat chassis, characterized in that: The invention comprises a base (100), wherein the base (100) is provided with a gear adjustment mechanism, and the base (100) is also symmetrically provided with two slide grooves (101), wherein a slider (1) is slidably connected in the slide groove (101), and a limit block (11) is connected to the outer wall of the slider (1); the slider (1) is connected to the gear adjustment mechanism via an elastic reset component, so as to drive the slider (1) to always follow the user's adjustment of the gear adjustment mechanism and slide in the slide groove (101) to a position after the gear is adjusted.

2. The conveniently adjustable seat chassis according to claim 1, characterized in that: The bottom of the slider (1) is provided with a slide rail (12) embedded in the slide groove (101); a cavity (13) is provided in the slider (1); two side walls of the symmetrical surfaces of the sliders (1) are provided with slide holes (14); a limiting portion (15) is provided in the middle of the slider (1) to divide the cavity (13) into a first cavity (131) and a second cavity (132); the elastic reset assembly comprises a first elastic member (131) respectively installed in the first cavity (131) and the second cavity (132); 2), a guide rod (3) is sleeved inside the first elastic member (2), the guide rod (3) comprises a pressing head (31) and a rod portion (32), one end of the pressing head (31) abuts against the limiting portion (15), and the other end abuts against the first elastic member (2), the upper and lower ends of the slider (1) are respectively provided with first through holes (16) for the rod portion (32) of the guide rod (3) to pass through, and the other end of the first elastic member (2) abuts against the inner wall of the cavity (13) facing the first through hole (16).

3. The conveniently adjustable seat chassis according to claim 2, characterized in that: The gear adjustment mechanism comprises a shift block (4), a fixing seat (5) fixedly connected to a base (100) and covering the shift block (4) and the slider (1); the upper end of the shift block (4) extends into the fixing seat (5), and the left and right ends respectively extend into the sliders (1) on both sides; the shift block (4) comprises shift pieces (41) symmetrically arranged at the left and right ends thereof; the limiting portion (15) is provided with an opening (151) for the shift piece (41) to pass through; the shift piece (41) passes through the sliding hole (14) and then extends into the opening (151) to simultaneously drive the rod portion (32) of the guide rod (3) in the first cavity (131) or the second cavity (132) to pass through the first through hole (16).

4. The conveniently adjustable seat chassis according to claim 3, characterized in that: The fixing seat (5) is provided with a guide through hole (51), the upper end of the shifting block (4) is provided with an elastic clamping piece (42), at least one side of the hole wall of the guide through hole (51) is provided with a plurality of first notches (511), the elastic clamping piece (42) extends into the guide through hole (51) and can be clamped into / out of the first notches (511) under the drive of the shifting block (4).

5. The conveniently adjustable seat chassis according to claim 4, characterized in that: The elastic clamping member (42) comprises a base (421) fixedly connected to the shifting block (4), and a movable member (422) elastically connected to the base (421); a guide channel (4211) with an opening at one end and a closed end at the other end is provided in the base (421); a second elastic member (423) is installed in the guide channel (4211); the movable member (422) is embedded in the opening of the base (421) and pressed against the second elastic member (423) so as to be inserted into / out of the first recess (511) under the drive of the shifting block (4).

6. The conveniently adjustable seat chassis according to claim 5, characterized in that: The first notch (511) is an arc-shaped notch, and the movable member (422) is a spherical body matched with the inner diameter of the guide channel (4211) so that the movable member (422) can roll at the opening of the base (421) when the movable member (422) is inserted into / out of the first notch (511).

7. The conveniently adjustable seat chassis according to claim 5, characterized in that: The base (100) is also provided with a connecting column (102), each of which is provided with a threaded channel. The fixing seat (5) is provided with a threaded hole (1020), and a screw (6) is installed in the threaded hole (1020). The screw (6) passes through the threaded hole (1020) and then enters the threaded channel in the connecting column (102), thereby connecting and fixing the fixing seat (5) to the base (100).

8. The conveniently adjustable seat chassis according to claim 7, characterized in that: The connecting column (102) comprises a first connecting column (1021) and a second connecting column (1022); the first connecting column (1021) is arranged between the two sliders (1), and the first connecting column (1021) is arranged on the path of the shift block (4) sliding upward to prevent the shift block (4) from sliding upward excessively; a second notch (43) is provided on the side of the shift block (4) facing the first connecting column (1021); the second connecting column (1022) is symmetrically arranged in two and is respectively arranged on the outer sides of the two sliders (1), and the second connecting column (1022) is arranged on the path of the slider (1) sliding downward to prevent the slider (1) from sliding downward excessively.

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