Chassis with seat depth adjustment function

Abstract

This application discloses a chassis with adjustable seat depth, including a top plate and a support plate. The top plate is slidably connected to the top of the support plate. A movable groove extending in the front-to-back direction is formed in the center of the top plate. Multiple locking grooves are recessed on one side wall of the movable groove. A locking block is slidably connected to the support plate in the left-to-right direction, and the top of the locking block engages with a locking groove or a movable groove. An adjustment structure is provided on the support plate, configured to drive the locking block to slide left and right. The chassis with adjustable seat depth provided by this application allows the seat to be connected to the top plate and slide back and forth together with the top plate to adjust the seat depth, thereby improving the chassis's adjustment freedom and practicality. Furthermore, locking or unlocking the top plate by sliding the locking block into the movable groove or locking groove is simple and the structure is compact. The locking block, movable groove, and locking groove are all located inside the chassis, which not only improves aesthetics but also ensures high stability during adjustment.

Description

Technical Field

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

[0002] The chassis is a common component in seats, connecting the seat and gas spring, and connecting to the backrest via a rotatable and adjustable tailplate to support the backrest's reclining and rotation adjustment. Furthermore, with technological advancements, the functions of existing chassis on the market are becoming increasingly diverse. Among them, chassis with adaptive adjustment functions are widely favored by consumers. For example, an existing patent provides an adjustable adaptive seat chassis (application number: CN202121483063.9), which includes a chassis, a movable tail fin, a tray, and a chassis linkage component. These four components are hinged together, so that when the movable tail fin rotates backward, the chassis linkage component rotates backward synchronously, causing the tray to rise backward and upward. This means that the seat connected to the tray can adjust its posture synchronously with the backrest reclining, reducing the back-rubbing sensation caused to the user's back when the seat reclines.

[0003] However, the above solution still has the following drawbacks: the tray is directly fixed to the bottom of the seat, that is, the seat and the chassis remain relatively fixed, and the seat depth cannot be further adjusted. However, for users of different body types, there are differences in the horizontal distance between the back edge of their buttocks and the bend behind their knees. This means that seats with fixed seat depth cannot meet the needs of various users and are not practical. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a chassis with seat depth adjustment function. By setting a top plate that is slidably connected to the top of the support plate, and the seat is connected to the top plate and can slide back and forth together with the top plate to adjust the seat depth, the chassis adjustment freedom is improved and the practicality is strong. In addition, the top plate is locked or unlocked by a sliding locking block engaging with a movable groove or locking groove. The adjustment operation is simple and the structure is compact. The locking block, movable groove and locking groove are all set inside the chassis, which not only improves the aesthetics, but also makes the adjustment operation more stable.

[0005] The effect of this utility model is achieved as follows: This application provides a chassis with seat depth adjustment function, including a top plate and a support plate. The top plate is configured to support the bottom of the seat and is slidably connected to the top of the support plate. The top plate has a hollowed-out center forming a movable groove extending in the front-back direction. Multiple locking grooves are recessed on one side of the groove wall on the left and right sides of the movable groove. A locking block is slidably connected to the support plate in the left-right direction, and the top of the locking block is engaged in the locking groove or the movable groove. An adjustment structure is provided on the support plate, which is configured to drive the locking block to slide left and right. The chassis with seat depth adjustment function has a switchable locked state and unlocked state. In the locked state, the adjustment structure drives the locking block to slide into the locking groove, and the top plate and the support plate are relatively fixed in the front-back direction. In the unlocked state, the adjustment structure drives the locking block to slide into the movable groove. When the top plate slides back and forth relative to the support plate, the locking block slides back and forth along the movable groove.

[0006] Furthermore, the adjustment structure includes a slider and a support base. The support base is detachably connected to the bottom of the support plate, and the top of the support base has a recessed groove extending in the left-right direction. The slider is slidably connected to the support base through the groove, and a locking block is formed on the top of the slider. By setting the support base to support the left-right sliding of the slider, the adjustment operation of the chassis is made more stable and smooth. After the slider is installed into the support base, it is also installed at the bottom of the support plate, making the chassis assembly operation relatively simple.

[0007] Furthermore, the adjustment structure also includes a wired switch and a pull cable. An opening is provided on one side of the slide groove, through which the sliding element passes from the support base. One end of the pull cable is connected to the sliding element, and the other end is connected to the wired switch. The wired switch is configured to pull or release the pull cable, which in turn causes the sliding element to slide left or right. This further enhances the ease of chassis adjustment operation.

[0008] Furthermore, a first elastic element is provided between the slider and the support base. The first elastic element acts on the slider, so that the slider always tends to drive the lock block towards the lock groove. This not only ensures that the chassis can be stably fixed in the current position when locked, but also that when unlocked, the slider, pushed by the first elastic element, drives the lock block to automatically engage in the lock groove at the current position, making the chassis adjustment operation simpler.

[0009] Furthermore, the bottom of the slider has a downwardly extending pressing portion, and the bottom of the groove has an upwardly extending limiting portion. When the slider slides left and right, the pressing portion moves towards or away from the limiting portion, and the first elastic member is disposed between the pressing portion and the limiting portion. This results in higher connection strength and stability between the first elastic member, the slider, and the support base, thereby making the chassis adjustment operation smoother and more stable.

[0010] Furthermore, the adjustment structure includes a rod-shaped adjustment element that extends laterally through the support plate. One end of the adjustment element is bent upwards to form a locking block, and the other end extends out of the support plate and is equipped with a handle. The handle is configured for the user to push and pull the adjustment element. This makes the adjustment operation relatively simple, and the locking block, formed by bending one end of the adjustment element, has a simple structure and is relatively easy to manufacture.

[0011] Furthermore, the adjustment structure also includes an L-shaped mounting plate. The mounting plate includes a horizontal portion connected to the bottom of the support plate and a vertical portion extending downward relative to the horizontal portion. The horizontal portion has a through hole extending in the left-right direction, which connects to the movable slot and the locking slot. The adjustment component passes through the vertical portion, and the locking block passes upward through the through hole and engages with the movable slot or the locking slot. This not only makes the adjustment operation of the chassis more stable but also simplifies the installation operation.

[0012] Furthermore, a washer is fitted onto the adjusting component, and a second elastic element is positioned between the washer and the vertical part. The elastic force of the second elastic element acts on the washer, ensuring that the adjusting component always tends to drive the locking block towards the locking groove. This not only ensures that the chassis is stably fixed in the current position when locked, but also that when unlocked, the adjusting component, pushed by the second elastic element, automatically drives the locking block into the current locking groove, making chassis adjustment operations much simpler.

[0013] Furthermore, the top plate and the support plate are detachably connected by screws. The top plate has several limiting grooves extending in the front-to-back direction. The screws pass through the limiting grooves and are screwed to the support plate. When the top plate slides back and forth relative to the support plate, the screws slide along the limiting grooves. The top plate and the support plate are easy to install and remove and have a high connection strength. Moreover, the sliding direction and distance of the top plate are limited by the screws sliding along the limiting grooves, thereby further improving the stability of the chassis seat depth adjustment operation.

[0014] Furthermore, a third elastic element is provided between the top plate and the support plate. The elastic force of the third elastic element acts on the top plate, causing the top plate to always have a tendency to slide backward relative to the support plate. This makes the chassis reset operation relatively simple.

[0015] The chassis with adjustable seat depth provided in this application features a top plate that slides back and forth on the top of a support plate. The seat is connected to the top plate and can slide back and forth with the top plate to adjust the seat depth, thereby improving the chassis's adjustability and meeting the needs of more users, making it highly practical. Furthermore, the top plate is locked or unlocked by a sliding locking block engaging with a movable groove or locking slot, making the adjustment operation simple and the structure compact. The locking block, movable groove, and locking slot are all located inside the chassis, which not only enhances aesthetics but also ensures high stability of the adjustment operation. Attached Figure Description

[0016] 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 chassis when using wire-controlled adjustment, provided for an embodiment of this application; Figure 2 This is a schematic diagram illustrating the state changes of the chassis when using drive-by-wire adjustment, as provided in an embodiment of this application. Figure 3 This is a schematic diagram of the connection structure between the support plate and the base when using wired adjustment in an embodiment of this application; Figure 4 A schematic diagram of the bottom structure of the support plate when using wired adjustment, provided for an embodiment of this application; Figure 5 This is a schematic diagram of the connection structure between the top plate and the support plate when using wired adjustment in an embodiment of this application; Figure 6 This is a schematic diagram of the connection structure between the slider and the support base provided in an embodiment of this application; Figure 7 A schematic cross-sectional view of the chassis when using wire-controlled adjustment, provided for an embodiment of this application; Figure 8 This is a three-dimensional structural diagram of the chassis when using a pull rod for adjustment, provided in an embodiment of this application. Figure 9 This is a schematic diagram illustrating the state changes of the chassis when adjusted using a pull rod, as provided in an embodiment of this application. Figure 10 This is a schematic diagram of the connection structure between the support plate and the base when using a pull rod for adjustment, provided in an embodiment of this application. Figure 11 A schematic diagram of the bottom structure of the support plate when using a pull rod for adjustment, provided in an embodiment of this application; Figure 12 This is a schematic diagram of the connection structure between the top plate and the support plate when using a pull rod for adjustment, as provided in an embodiment of this application. Figure 13 This is a cross-sectional structural diagram of the chassis when adjusted using a tie rod, as provided in an embodiment of this application.

[0017] The attached figures are labeled as follows: 1-Top plate, 101-Limiting groove, 110-Moving groove, 111-Locking groove, 2-Support plate, 201-Connecting hole, 210-Positioning part, 3-Locking block, 4-Sliding part, 410-Pressing part, 5-Support base, 510-Slide groove, 511-Limiting part, 520-First elastic element, 6-Wire control switch, 610-Pull wire, 7-Adjusting part, 710-Handle, 720-Washer, 730-Second elastic element, 8-Mounting plate, 810-Horizontal part, 811-Through hole, 820-Vertical part, 9-Third elastic element, 10-Base, 11-Tail plate, 12-Linkage plate, 13-Decorative cover. Detailed Implementation

[0018] 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.

[0019] Please refer to the attached document. Figure 1-13 This application provides a chassis with seat depth adjustment function, including a top plate 1 and a support plate 2. The top plate 1 is configured to support the bottom of the seat. The top plate 1 is slidably connected to the top of the support plate 2. The middle of the top plate 1 is hollowed out to form a movable groove 110 extending in the front-back direction. Multiple locking grooves 111 are recessed on one side of the groove wall on the left and right sides of the movable groove 110. A locking block 3 is slidably connected to the support plate 2 in the left-right direction, and the top of the locking block 3 is engaged in the locking groove 111 or the movable groove 110. An adjustment structure is provided on the support plate 2, which is configured to drive the locking block 3 to slide left and right. The chassis with seat depth adjustment function has a switchable locked state and unlocked state. In the locked state, the adjustment structure drives the locking block 3 to slide into the locking groove 111, and the top plate 1 and the support plate 2 are relatively fixed in the front-to-back direction. In the unlocked state, the adjustment structure drives the locking block 3 to slide into the movable groove 110. When the top plate 1 slides back and forth relative to the support plate 2, the locking block 3 slides back and forth along the movable groove 110.

[0020] In this embodiment, a top plate 1 is slidably connected to the top of the support plate 2. The seat is connected to the top plate 1 and can slide back and forth with the top plate 1 to adjust the seat depth, thereby improving the adjustment freedom of the chassis, meeting the needs of more users, and making it highly practical. Furthermore, the top plate 1 is locked or unlocked by the sliding locking block 3 engaging with the movable groove 110 or the locking groove 111. The adjustment operation is simple, and the structure is compact. The locking block 3, the movable groove 110, and the locking groove 111 are all located inside the chassis, which not only improves aesthetics but also makes the adjustment operation more stable.

[0021] The chassis also includes a base 10, a tail plate 11, and a linkage plate 12. The base 10 connects to the gas spring, and the tail plate 11 connects to the chair back. The base 10, tail plate 11, linkage plate 12, and support plate 2 are hinged together to form a four-bar linkage structure. When the chair back is tilted back, the linkage plate 12 rotates backward along with the tail plate 11, thereby lifting the top support plate 2 backward and upward. In other words, the seat rises backward and upward as the chair back tilts back, making the overall posture of the seat conform to the curve of the human back, eliminating back rubbing and providing a high level of comfort. The chassis also includes a box-shaped decorative cover 13 at the bottom. The decorative cover 13 covers the bottom of the support plate 2 and conceals the base, tail plate 11, and linkage plate 12 inside, making the chassis look cleaner while protecting the internal structure.

[0022] Preferably, the side wall of the movable groove 110 is provided with five locking grooves 111, meaning the chassis has at least five adjustable seat depth positions, providing a high degree of adjustment freedom. Of course, in other embodiments of this application, the number of locking grooves 111 can also be three, four, six, etc.

[0023] Please refer to the attached document. Figure 4-6 In some embodiments of this application, the adjustment structure includes a slider 4 and a support base 5. The support base 5 is detachably connected to the bottom of the support plate 2, and the top of the support base 5 is recessed to form a groove 510 extending in the left-right direction. The slider 4 is slidably connected to the support base 5 through the groove 510, and a locking block 3 is formed on the top of the slider 4.

[0024] In this embodiment, by setting a support base 5 to support the sliding member 4 to slide left and right, and driving the locking block 3 to move between the movable groove 110 and the locking groove 111, the adjustment operation of the chassis is more stable and smooth. The support base 5 is detachably connected to the bottom of the support plate 2, which is not only hidden inside the chassis, but also allows the sliding member 4 to be installed together with the support base 5 and installed at the bottom of the support plate 2, so that the locking block 3 on the sliding member 4 can be engaged in the movable groove 110 or the locking groove 111, making the assembly operation of the chassis more convenient.

[0025] Please refer to the appendix. Figure 5 The bottom of the support plate 2 is hollowed out to form a connecting hole 201 extending in the left and right direction. The connecting hole 201 connects the movable groove 110 and the locking groove 111. The locking block 3 passes through the connecting hole 201 upward and is locked into the movable groove 110 or the locking groove 111. When the sliding member 4 slides left and right, the locking block 3 slides left and right relative to the support plate 2 through the connecting hole 201, making the adjustment operation more stable.

[0026] Preferably, the support base 5 is detachably connected to the support plate 2 by means of screws, which makes the installation and disassembly of the support base 5 simple and the connection strength between the support base 5 and the support plate 2 high.

[0027] Please refer to the attached document. Figure 4-6 In some embodiments of this application, the adjustment structure further includes a wired switch 6 and a pull cable 610. One side of the groove 510 has an opening, through which the sliding member 4 passes through the support base 5. One end of the pull cable 610 is connected to the sliding member 4, and the other end is connected to the wired switch 6. The wired switch 6 is configured to pull or release the pull cable 610, thereby causing the sliding member 4 to slide left and right. By adjusting the sliding member 4 via wired control, the locking block 3 is controlled to engage with the movable groove 110 or the locking slot 111, further improving the ease of chassis adjustment operation.

[0028] Among them, the support plate 2 is a sheet metal part. The bottom of the support plate 2 is bent to form two downwardly extending positioning parts 210. One end of the pull wire 610 passes through the positioning part 210 and is connected to the sliding part 4, thereby fixing the pull wire 610 to the support plate 2.

[0029] Please refer to the attached document. Figure 6-7 In some embodiments of this application, a first elastic element 520 is provided between the sliding member 4 and the support base 5. The first elastic element 520 acts on the sliding member 4, so that the sliding member 4 always has the tendency to drive the locking block 3 to engage with the locking groove 111.

[0030] In this embodiment, by setting the first elastic element 520 to push the sliding element 4, not only can the locking block 3, in the locked state, be pressed tightly against the groove wall of the locking groove 111 by the elastic force of the first elastic element 520, so that the chassis can be stably fixed in the current position, but also in the unlocked state, when the user adjusts to a suitable seat depth, he only needs to release the wire control switch 6. The wire control switch 6 releases the pull cable 610, and the sliding element 4, under the push of the first elastic element 520, drives the locking block 3 to automatically engage in the locking groove 111 at the current position, and the chassis automatically switches to the locked state, making the chassis adjustment operation more convenient.

[0031] Please refer to the attached document. Figure 6-7 In some embodiments of this application, the bottom of the slider 4 is formed with a downwardly extending pressing portion 410, and the bottom of the groove 510 is formed with an upwardly extending limiting portion 511. When the slider 4 slides left and right, the pressing portion 410 moves toward or away from the limiting portion 511, and the first elastic member 520 is disposed between the pressing portion 410 and the limiting portion 511.

[0032] In this embodiment, by providing a left-right spaced pressing part 410 and a limiting part 511 between the sliding member 4 and the slide groove 510, and by providing a first elastic member 520 between the pressing part 410 and the limiting part 511, the structure is more compact, and the connection strength and stability between the first elastic member 520, the sliding member 4, and the support seat 5 are higher, thereby making the chassis adjustment operation smoother and more stable.

[0033] Preferably, the first elastic element 520 is a spring, which not only has strong elastic force but also has a simple structure and is easy to install. Of course, in other embodiments of this application, the first elastic element 520 can also be made of a sheet, rubber, or other materials.

[0034] In this application, in addition to using drive-by-wire adjustment to adjust the chassis, a lever adjustment method can also be used: Please refer to the attached document. Figure 8-13In some embodiments of this application, the adjustment structure includes a rod-shaped adjustment member 7, which is transversely inserted through the support plate 2. One end of the adjustment member 7 is bent upward to form a locking block 3, and the other end extends out of the support plate 2 and is provided with a handle 710. The handle 710 is configured for the user to push and pull the adjustment member 7.

[0035] In this embodiment, the user can move the adjusting member 7 left and right by pushing and pulling the handle 710, which will cause the locking block 3 to move between the movable groove 110 and the locking groove 111 to adjust the state of the base. The operation is relatively simple. The locking block 3 is formed by bending one end of the adjusting member 7 upward, which is simple in structure and easy to process and manufacture.

[0036] Please refer to the attached document. Figure 11-13 In some embodiments of this application, the adjustment structure further includes an L-shaped mounting plate 8. The mounting plate 8 includes a horizontal portion 810 connected to the bottom of the support plate 2 and a vertical portion 820 extending downward relative to the horizontal portion 810. A through hole 811 extending in the left-right direction is formed on the horizontal portion 810. The through hole 811 connects the movable groove 110 and the locking groove 111. The adjustment member 7 passes through the vertical portion 820, and the locking block 3 passes upward through the through hole 811 and is engaged in the movable groove 110 or the locking groove 111.

[0037] In this embodiment, the L-shaped mounting plate 8 supports both the adjusting member 7 and the locking block 3, which not only makes the adjustment operation of the chassis more stable, but also makes the assembly operation simpler. It is only necessary to first put the mounting plate 8 on the adjusting member 7 and then install the mounting plate 8 to the bottom of the support plate 2.

[0038] The bottom of the support plate 2 is bent to form two downwardly extending positioning parts 210 on the left and right. The adjusting member 7 passes through the positioning part 210 and the vertical part 820 on one side, so that the adjusting member 7 is relatively fixed to the support plate 2 in the vertical direction and the front-back direction, thereby further improving the connection strength between the adjusting member 7 and the support plate 2.

[0039] Preferably, the mounting plate 8 and the support plate 2 are detachably connected by screws, which makes the installation and removal of the mounting plate 8 relatively simple and the connection strength between the mounting plate 8 and the support plate 2 relatively high.

[0040] Please refer to the attached document. Figure 11-13 In some embodiments of this application, a washer 720 is fitted onto the adjusting member 7, and a second elastic member 730 is provided between the washer 720 and the vertical part 820. The elastic force of the second elastic member 730 acts on the washer 720, so that the adjusting member 7 always has the tendency to drive the locking block 3 to engage with the locking groove 111.

[0041] In this embodiment, by setting the second elastic element 730 to push the washer 720, thereby driving the adjusting element 7 and the locking block 3 to move, not only can the locking block 3, in the locked state, be tightly pressed against the groove wall of the locking groove 111 by the elastic force of the second elastic element 730, so that the chassis can be stably fixed in the current position, but also in the unlocked state, when the user adjusts to a suitable seat depth, he only needs to release the handle 710. The adjusting element 7, under the pushing of the second elastic element 730, drives the locking block 3 to automatically engage in the current position of the locking groove 111, and the chassis automatically switches to the locked state, making the chassis adjustment operation simpler.

[0042] Preferably, the second elastic element 730 is a spring, which not only has strong elasticity, but also can be directly sleeved onto the adjusting element 7, making installation very convenient.

[0043] Please refer to the attached document. Figure 5 and attached Figure 12 In some embodiments of this application, the top plate 1 and the support plate 2 are detachably connected by screws. The top plate 1 has a plurality of limiting grooves 101 extending in the front-back direction. The screws pass through the limiting grooves 101 and are screwed to the support plate 2. When the top plate 1 slides back and forth relative to the support plate 2, the screws slide along the limiting grooves 101.

[0044] In this embodiment, the top plate 1 and the support plate 2 are connected by screws, which makes it easy to install and remove and provides a strong connection. Moreover, by sliding the screws along the limiting groove 101, the sliding direction and sliding distance of the top plate 1 are restricted, thereby further improving the stability of the chassis seat depth adjustment operation.

[0045] Preferably, the top plate 1 has four symmetrically distributed limiting grooves 101 hollowed out, and the top plate 1 and the support plate 2 are connected and fixed by four sets of screws, thereby further improving the connection strength between the top plate 1 and the support plate 2 and making the chassis seat depth adjustment operation more stable.

[0046] Please refer to the attached document. Figure 4 and attached Figure 11 In some embodiments of this application, a third elastic member 9 is provided between the top plate 1 and the support plate 2. The elastic force of the third elastic member 9 acts on the top plate 1, so that the top plate 1 always has a tendency to slide backward relative to the support plate 2.

[0047] In this embodiment, when the top plate 1 is slid forward to adjust the seat depth, the top plate 1 stretches the third elastic element 9 to produce elastic deformation. When the user wants to readjust the seat depth, there is no need to manually reset the seat to the initial position. Simply switch the chassis to the unlocked state, and the top plate 1 automatically slides backward under the reset force of the third elastic element 9, thus driving the seat to reset to the initial position. This makes the chassis reset operation relatively simple.

[0048] Preferably, the third elastic element 9 is a tension spring, with one end of the tension spring attached to the top plate 1 and the other end attached to the support plate 2. It has strong elasticity and is relatively easy to install.

[0049] 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.

[0050] 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 chassis with seat depth adjustment function, characterized in that, The device includes a top plate (1) and a support plate (2). The top plate (1) is configured to support the bottom of the seat. The top plate (1) is slidably connected to the top of the support plate (2). The top plate (1) has a hollowed-out center forming a movable groove (110) extending in the front-back direction. Multiple locking grooves (111) are recessed on one side of the groove wall on the left and right sides of the movable groove (110). A locking block (3) is slidably connected to the support plate (2) in the left-right direction. The top of the locking block (3) is engaged in the locking groove (111) or the movable groove (110). An adjustment structure is provided on the support plate (2). The adjustment structure is configured to drive the locking block (3) to slide left and right. The chassis with seat depth adjustment function has a switchable locked state and unlocked state. In the locked state, the adjustment structure drives the locking block (3) to slide into the locking groove (111), and the top plate (1) and the support plate (2) are relatively fixed in the front-to-back direction. In the unlocked state, the adjustment structure drives the locking block (3) to slide into the movable groove (110). When the top plate (1) slides back and forth relative to the support plate (2), the locking block (3) slides back and forth along the movable groove (110).

2. The chassis with seat depth adjustment function according to claim 1, characterized in that, The adjustment structure includes a slider (4) and a support base (5). The support base (5) is detachably connected to the bottom of the support plate (2), and the top of the support base (5) is recessed to form a sliding groove (510) extending in the left and right direction. The slider (4) is slidably connected to the support base (5) through the sliding groove (510), and the top of the slider (4) is formed with the locking block (3).

3. The chassis with seat depth adjustment function according to claim 2, characterized in that, The adjustment structure also includes a wired switch (6) and a pull wire (610). One side of the groove wall on the left and right sides of the slide (510) is open. The sliding member (4) passes through the support base (5) from the opening. One end of the pull wire (610) is connected to the sliding member (4) and the other end is connected to the wired switch (6). The wired switch (6) is configured to pull or release the pull wire (610) and drive the sliding member (4) to slide left and right through the pull wire (610).

4. The chassis with seat depth adjustment function according to claim 2, characterized in that, A first elastic element (520) is provided between the sliding member (4) and the support base (5). The first elastic element (520) acts on the sliding member (4), so that the sliding member (4) always has the tendency to drive the locking block (3) to engage with the locking groove (111).

5. The chassis with seat depth adjustment function according to claim 4, characterized in that, The bottom of the sliding member (4) has a downwardly extending pressing part (410), and the bottom of the groove (510) has an upwardly extending limiting part (511). When the sliding member (4) slides left and right, the pressing part (410) moves towards or away from the limiting part (511). The first elastic member (520) is disposed between the pressing part (410) and the limiting part (511).

6. The chassis with seat depth adjustment function according to claim 1, characterized in that, The adjustment structure includes a rod-shaped adjustment member (7), which is horizontally inserted through the support plate (2). One end of the adjustment member (7) is bent upward to form a locking block (3), and the other end extends out of the support plate (2) and is provided with a handle (710). The handle (710) is configured for the user to push and pull the adjustment member (7).

7. The chassis with seat depth adjustment function according to claim 6, characterized in that, The adjustment structure also includes an L-shaped mounting plate (8), which includes a horizontal part (810) connected to the bottom of the support plate (2) and a vertical part (820) extending downward relative to the horizontal part (810). The horizontal part (810) has a through hole (811) extending in the left-right direction, which connects the movable groove (110) and the locking groove (111). The adjustment member (7) passes through the vertical part (820), and the locking block (3) passes upward through the through hole (811) and is engaged in the movable groove (110) or the locking groove (111).

8. The chassis with seat depth adjustment function according to claim 7, characterized in that, A washer (720) is fitted onto the adjusting member (7), and a second elastic member (730) is provided between the washer (720) and the vertical part (820). The elastic force of the second elastic member (730) acts on the washer (720), so that the adjusting member (7) always has the tendency to drive the locking block (3) to engage with the locking groove (111).

9. The chassis with seat depth adjustment function according to claim 1, characterized in that, The top plate (1) and the support plate (2) are detachably connected by screws. The top plate (1) has a plurality of limiting grooves (101) extending in the front-back direction. The screws pass through the limiting grooves (101) and are screwed to the support plate (2). When the top plate (1) slides back and forth relative to the support plate (2), the screws slide along the limiting grooves (101).

10. The chassis with seat depth adjustment function according to claim 1, characterized in that, A third elastic element (9) is provided between the top plate (1) and the support plate (2). The elastic force of the third elastic element (9) acts on the top plate (1), so that the top plate (1) always has a tendency to slide backward relative to the support plate (2).

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