Backrest pitching adjusting mechanism

Abstract

The backrest pitching adjusting mechanism comprises a seat assembly and a backrest assembly, the front end of the backrest assembly is rotationally connected to the seat assembly, the rear end of the backrest assembly is connected with the seat assembly through a sliding assembly, and the sliding assembly comprises an adjusting supporting part and a sliding part slidably connected to the adjusting supporting part; the adjusting supporting part is arranged on one of the backrest assembly and the seat assembly, the sliding part is hinged to the other one of the backrest assembly and the seat assembly, and when the sliding part slides back and forth relative to the seat assembly, the backrest assembly rotates back and forth relative to the seat assembly; a gear adjusting assembly is further arranged between the sliding piece and the adjusting supporting part, the gear adjusting assembly comprises a clamping block and a plurality of gear grooves, the clamping block is arranged on one of the sliding piece and the adjusting supporting part, and the gear grooves are formed in the other one of the sliding piece and the adjusting supporting part; when the sliding piece slides back and forth relative to the adjusting supporting part, the clamping block is in clamping fit with the gear grooves in sequence.

Description

Technical Field

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

[0002] Seating is an essential piece of seating in people's daily lives, and it usually consists of several parts: a backrest, a base, and a seat. In the existing technology, the base is usually fixedly connected to the bottom of the seat, while the backrest is fixedly connected to the base at the bottom of the seat, so that the backrest always remains vertical and relatively fixed to the seat.

[0003] However, in actual use of chairs, especially after long periods of working or studying at a desk, people often experience lower back fatigue and need to lie down to rest. But existing chairs can only maintain an upright position, preventing users from lying down to rest. For example, in office furniture manufacturers, staff often have to prepare folding beds for rest, requiring them to get up from their chairs and lie down on the folding beds. This not only takes up valuable office space but also presents numerous inconveniences.

[0004] Therefore, designing a chair with an adjustable backrest has become the main problem that needs to be solved. Summary of the Invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a backrest tilt adjustment mechanism in which the seat assembly, backrest assembly, sliding member, and adjustment support are configured in a structure similar to a linkage and slide groove. This not only makes the overall structure of the seat stable, but also allows the backrest assembly to be tilted by sliding the sliding member. Furthermore, the sliding member and the adjustment support are engaged by a locking block and several position slots to achieve position adjustment, making the tilt adjustment operation of the backrest assembly not only simple, but also providing a tactile feedback and relatively smooth adjustment process.

[0006] The effect of this utility model is achieved as follows:

[0007] This application provides a backrest tilt adjustment mechanism, including a seat assembly and a backrest assembly. The front end of the backrest assembly is rotatably connected to the seat assembly, and the rear end of the backrest assembly and the seat assembly are connected via a sliding assembly. The sliding assembly includes an adjustment support and a slider slidably connected to the adjustment support. The adjustment support is disposed in one of the backrest assembly and the seat assembly, and the slider is hinged to the other of the backrest assembly and the seat assembly. When the slider slides back and forth relative to the seat assembly, the backrest assembly rotates back and forth relative to the seat assembly. A gear adjustment assembly is also provided between the slider and the adjustment support. The gear adjustment assembly includes a locking block and several gear slots. The locking block is disposed in one of the slider and the adjustment support, and the several gear slots are disposed in the other of the slider and the adjustment support. When the slider slides back and forth relative to the adjustment support, the locking block engages with the several gear slots in sequence.

[0008] Furthermore, the locking block is movably connected to the adjusting support, and the sliding member is correspondingly provided with several gear slots. The gear adjustment component has a switchable locked state and an unlocked state. In the locked state, the locking block slides outward to engage with the gear slot, thus fixing the adjusting support and the sliding member relatively. In the unlocked state, the locking block slides inward to retract into the adjusting support and avoid the gear slot, allowing the sliding member to slide relative to the adjusting support again. By movably setting the locking block on the adjusting support and using its movement to engage or avoid the gear slot, the movement or fixation between the adjusting support and the sliding member is achieved, facilitating operation and making gear adjustment operation relatively simple.

[0009] Furthermore, the adjustment support includes an adjustment component, which is a hollow structure with an internal mounting cavity. One end of a locking block passes through the side wall of the adjustment component and extends into the mounting cavity. A torsion spring is installed inside the mounting cavity. One arm of the torsion spring is connected to the locking blocks on both sides, and the other arm is connected to a transmission component. The transmission component can slide within the mounting cavity, driving the torsion spring to pull inward or push outward against the locking block, thereby switching the gear adjustment assembly between a locked and unlocked state. Simply sliding the adjustment transmission component is sufficient to drive the torsion spring to push or pull the locking block, thereby adjusting the gear adjustment assembly between the locked and unlocked states, making the seat gear adjustment operation relatively simple.

[0010] Furthermore, a wired control mechanism is provided between the seat assembly and the adjustment component. The wired control mechanism includes an adjustment switch and a pull cord connecting the adjustment switch and the transmission component. The adjustment switch is configured to pull or release the transmission component by adjusting the pull cord, thereby causing the transmission component to slide back and forth within the mounting cavity. The wired control mechanism can be used to lock or unlock the adjustment component, further improving the ease of operation for adjusting the seat tilt position.

[0011] Furthermore, a spring is installed inside the mounting cavity. The spring applies tension to the locking block, causing it to always tend to slide backward, which in turn causes it to always tend to engage with the gear shift slot. The locking block automatically engages with the gear shift slot with the help of the spring force, which not only makes the seat tilt adjustment operation simpler, but also ensures the stability of the seat when locked, as the locking block is stably engaged with the gear shift slot with the help of the spring force.

[0012] Furthermore, the sliding member and the adjustment support are connected by a positioning structure. The positioning structure includes a first positioning groove formed in one of the sliding member and the adjustment support. The first positioning groove extends in a front-to-back direction, and the sliding member is slidably connected to the adjustment support through the first positioning groove. By setting the first positioning groove to restrict the sliding direction of the sliding member, the connection strength between the sliding member and the adjustment support is increased, and the tilt adjustment operation of the seat is more stable.

[0013] Furthermore, a first positioning groove is formed in the sliding member, and the adjusting support includes an adjusting member. The sliding member is slidably connected to the adjusting member through the first positioning groove. Gear adjustment components are provided between the two side walls of the sliding member and the two side walls of the first positioning groove. This further improves the connection strength between the sliding member and the adjusting support, making the seat tilt adjustment operation more stable.

[0014] Furthermore, the sliding member has a second positioning groove extending in the front-to-back direction, and the adjusting support includes a support plate and an adjusting member detachably connected to the support plate. The adjusting member has a protruding positioning part that passes through the second positioning groove and connects to the support plate, so that the sliding member is clamped between the support plate and the adjusting member, and the sliding member can slide back and forth relative to the adjusting member through the second positioning groove. This not only increases the connection strength between the sliding member and the support plate but also makes the sliding process of the sliding member smoother and more stable.

[0015] Furthermore, the seat assembly includes a seat body and a tray supported at the bottom of the seat body, with an adjustment support extending rearward from the rear end of the tray; the backrest assembly includes a backrest body and a back support hinged to the rear side of the backrest body, with the bottom end of the back support hinged to a sliding member. The adjustment support is part of the tray, facilitating manufacturing.

[0016] Furthermore, the tray includes a fixed tray and a movable tray joined together vertically. The front ends of the fixed tray and the movable tray are hinged to each other, allowing the movable tray to rotate vertically relative to the fixed tray. The adjustment support extends rearward from the rear end of the movable tray. The seat assembly also includes a front support hinged to the fixed tray, with its upper end hinged to the front end of the backrest body. When the backrest body is subjected to a reclining force, the back support is pressed and swings backward, and the front support swings backward synchronously with the back support. The movable tray is also pressed and rotates downward relative to the fixed tray, thereby causing the upper backrest body to rotate backward at a greater angle. By hinged together the backrest body, movable tray, front support, and back support to form a four-bar linkage-like structure, not only is the overall seat structure more stable, but the backrest body can also recline to a greater angle, allowing the user to lie back in a more comfortable posture and providing a more comfortable user experience.

[0017] The backrest tilt adjustment mechanism provided in this application connects the seat assembly and the backrest assembly via a sliding component, forming a linkage-like groove structure between the seat assembly, backrest assembly, sliding component, and adjustment support. This not only stabilizes the overall seat structure but also allows the backrest assembly to be tilted by sliding the sliding component. Furthermore, the sliding component and adjustment support are engaged by a locking block and several position slots to achieve position adjustment, making the tilt adjustment of the backrest assembly not only simple but also providing a tactile feedback and a relatively smooth adjustment process. Attached Figure Description

[0018] 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:

[0019] Figure 1 A three-dimensional structural diagram of the seat provided in the embodiments of this application;

[0020] Figure 2 This is a schematic diagram of the backrest structure of the seat provided in an embodiment of this application;

[0021] Figure 3 This is a schematic diagram of the side structure of the seat in its initial state, provided in an embodiment of this application.

[0022] Figure 4 This is a side view of the seat in a pitched state, as provided in an embodiment of this application.

[0023] Figure 5 This is a schematic diagram of the connection structure between the tray and the sliding assembly provided in an embodiment of this application;

[0024] Figure 6 This is a schematic diagram illustrating the change of the tray during pitch adjustment, provided in an embodiment of this application.

[0025] Figure 7This is a schematic diagram of the connection structure between the slider and the adjusting member provided in an embodiment of this application;

[0026] Figure 8 This is a schematic diagram of the internal structure of the adjusting member provided in the embodiments of this application;

[0027] Figure 9 This is a schematic diagram of the connection structure between the slider and the adjusting member in the locked state provided in an embodiment of this application;

[0028] Figure 10 This is a schematic diagram of the connection structure between the slider and the adjusting member in the unlocked state provided in an embodiment of this application.

[0029] Figure 11 This is a schematic diagram of the connection structure between the tray and the chair body provided in an embodiment of this application.

[0030] The reference numerals in the attached figures are as follows: 1-seat assembly, 101-adjustment support, 102-support plate, 110-adjustment component, 111-block, 112-mounting cavity, 113-torsion spring, 114-transmission component, 115-spring, 116-positioning component, 120-adjustment switch, 130-seat body, 131-connection component, 132-guide groove, 140-fixed plate, 150-moving plate, 160-front support, 161-first support rod, 162-second support rod, 2-backrest assembly, 210-sliding component, 211-positioning groove, 212-first positioning groove, 213-second positioning groove, 220-backrest body, 230-backrest support. Detailed Implementation

[0031] 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.

[0032] Please refer to the attached document. Figure 1-11This application provides a backrest tilt adjustment mechanism, including a seat assembly 1 and a backrest assembly 2. The front end of the backrest assembly 2 is rotatably connected to the seat assembly 1, and the rear end of the backrest assembly 2 and the seat assembly 1 are connected by a sliding assembly. The sliding assembly includes an adjustment support 101 and a sliding member 210 slidably connected to the adjustment support 101. The adjustment support 101 is disposed in one of the backrest assembly 2 and the seat assembly 1, and the sliding member 210 is hinged to the other of the backrest assembly 2 and the seat assembly 1. The sliding member 210 is positioned relative to the seat. When component 1 slides back and forth, backrest component 2 rotates back and forth relative to seat component 1; a gear adjustment component is also provided between sliding member 210 and adjustment support part 101. The gear adjustment component includes a locking block 111 and several gear slots 211. The locking block 111 is provided in one of sliding member 210 and adjustment support part 101, and several gear slots 211 are provided in the other of sliding member 210 and adjustment support part 101; when sliding member 210 slides back and forth relative to adjustment support part 101, locking block 111 engages with several gear slots 211 in sequence.

[0033] In this embodiment, the seat assembly 1 and the backrest assembly 2 are connected by a sliding assembly, so that the seat assembly 1, the backrest assembly 2, the slider 210 and the adjustment support 101 form a structure similar to a linkage and slide groove. This not only makes the overall structure of the seat stable, but also allows the backrest assembly 2 to be tilted by sliding the slider 210. Furthermore, the slider 210 and the adjustment support 101 are engaged by a locking block 111 and several gear slots 211 to achieve gear adjustment, making the tilt adjustment operation of the backrest assembly 2 not only simple, but also providing a gear feel and relatively smooth adjustment process.

[0034] Please refer to the attached document. Figure 5-10 In some embodiments of this application, the locking block 111 is movably connected to the adjusting support 101, and the slider 210 is provided with a plurality of gear slots 211. The gear adjustment component has a switchable locked state and an unlocked state. In the locked state, the locking block 111 slides outward to engage with the gear slot 211, so that the adjusting support 101 and the slider 210 are relatively fixed. In the unlocked state, the locking block 111 slides inward to retract into the adjusting support 101 and avoid the gear slot 211, so that the slider 210 can slide relative to the adjusting support 101 again.

[0035] In this embodiment, by movably setting the locking block 111 on the adjustment support 101, and by using the movement of the locking block 111 to engage or avoid the gear slot 211, the movement or fixation between the adjustment support 101 and the slider 210 is realized, which facilitates operation and makes the gear adjustment operation more convenient.

[0036] Preferably, the slider 210 has four rows of gear slots 211 along its length, giving the gear adjustment component four adjustable gears and a high degree of adjustment freedom. Of course, in other embodiments of this application, the number of gear slots 211 on the slider 210 can also be three, five, six, etc.

[0037] Please refer to the attached document. Figure 5-10 In some embodiments of this application, the adjustment support 101 includes an adjustment member 110, which is a hollow structure including an internal mounting cavity 112. One end of the locking block 111 passes through the side wall of the adjustment member 110 and extends into the mounting cavity 112. A torsion spring 113 is provided in the mounting cavity 112. One side arm of the torsion spring 113 is connected to the locking blocks 111 on both sides, and the other side arm of the torsion spring 113 is connected to the transmission member 114. The transmission member 114 can slide in the mounting cavity 112 and drive the torsion spring 113 to pull inward or push outward to the locking block 111, thereby driving the gear adjustment component to switch between a locked state and an unlocked state.

[0038] In this embodiment, simply sliding the transmission component 114 can drive the torsion spring 113 to push or pull the locking block 111, thereby adjusting the gear adjustment component to switch between the locked and unlocked states, making the gear adjustment operation of the seat more convenient.

[0039] Please refer to the attached document. Figure 9-10 In some embodiments of this application, a wired control mechanism is provided between the seat assembly 1 and the adjustment member 110. The wired control mechanism includes an adjustment switch 120 and a pull cord connecting the adjustment switch 120 and the transmission member 114. The adjustment switch 120 is configured to adjust the pull cord to pull or release the transmission member 114, thereby causing the transmission member 114 to slide back and forth in the mounting cavity 112. The wired control mechanism can be used to lock or unlock the gear adjustment component, further improving the ease of operation of the seat tilt gear adjustment.

[0040] Please refer to the attached document. Figure 9-10 In some embodiments of this application, a spring 115 is also provided in the mounting cavity 112. The spring 115 applies a pulling force to the locking block 111, so that the locking block 111 always has a tendency to slide backward, thereby causing the locking block 111 to always have a tendency to engage with the gear slot 211.

[0041] In this embodiment, by setting a spring 115, after the seat is adjusted to a suitable angle, the locking block 111 automatically engages with the gear position slot 211 with the elastic force of the spring 115. This not only makes the tilt adjustment operation of the seat more convenient, but also ensures the stability of the seat by stably engaging with the gear position slot 211 with the elastic force of the spring 115 when locked.

[0042] When the adjustment switch 120 is turned on, the pull rope pulls the transmission component 114 forward, and drives the torsion spring 113 to pull the locking block 111 inward, so that the sliding component 120 can slide relative to the adjustment component 110 again. The spring 115 always pulls the transmission component 114, so that the transmission component 114 always has a tendency to slide backward. Therefore, when the adjustment switch 120 is turned off, the pull rope releases the transmission component 114, and the transmission component 114 automatically slides backward and resets under the elastic force of the spring 115, and drives the torsion spring 113 to push the locking block 111 outward, so that the locking block 111 re-locks into the gear slot 211, and the sliding component 120 is fixed to the adjustment component 110 again.

[0043] Please refer to the attached document. Figure 5-7 In some embodiments of this application, the slider 210 and the adjustment support 101 are connected by a positioning structure. The positioning structure includes a first positioning groove 212 formed in one of the slider 210 and the adjustment support 101. The first positioning groove 212 extends in a front-rear direction, and the slider 210 is slidably connected to the adjustment support 101 through the first positioning groove 212. By setting the first positioning groove 212 to limit the sliding direction of the slider 210, the connection strength between the slider 210 and the adjustment support 101 is higher, and the tilt adjustment operation of the seat is more stable.

[0044] Please refer to the attached document. Figure 5-7 In some embodiments of this application, the first positioning groove 212 is formed on the sliding member 210, the adjustment support part 101 includes the adjustment member 110, the sliding member 210 is slidably connected to the adjustment member 110 through the first positioning groove 212, and a gear adjustment component is provided between the two side walls of the sliding member 210 and the two side groove walls of the first positioning groove 212.

[0045] In this embodiment, the mounting cavity 112 is provided with two symmetrical locking blocks 111 and torsion springs 113. The lever arms of the torsion springs 113 on both sides are connected to the transmission member 114, so that the transmission member 114 can simultaneously drive the locking blocks 111 on both sides to push outward or retract inward. Gear adjustment components are provided on both sides of the sliding member 210 and the first positioning groove 212, further improving the connection strength between the sliding member 210 and the adjustment support 101, making the seat tilt adjustment operation more stable.

[0046] Please refer to the attached document. Figure 5-7In some embodiments of this application, the slider 210 is provided with a second positioning groove 213 extending in the front-back direction. The adjustment support 101 includes a support plate 102 and an adjustment member 110 detachably connected to the support plate 102. The adjustment member 110 is provided with a positioning part 116 protruding from it. The positioning part 116 passes through the second positioning groove 213 and is connected to the support plate 102, so that the slider 210 is clamped between the support plate 102 and the adjustment member 110, and the slider 210 can slide back and forth relative to the adjustment member 110 through the second positioning groove 213.

[0047] In this embodiment, the sliding member 210 is clamped by the support plate 102 and the adjusting member 110, and the sliding distance of the sliding member 210 is limited by the positioning part 116 and the second positioning groove 213. This not only makes the connection strength between the sliding member 210 and the support plate 102 higher, but also makes the sliding process of the sliding member 210 more stable and smooth.

[0048] Preferably, the adjusting member 110 has two symmetrically protruding positioning parts 116, and the sliding member 210 has two correspondingly hollowed-out second positioning grooves 213, further enhancing the connection strength between the sliding member 210 and the adjusting member 110. After the positioning parts 116 pass through the second positioning grooves 213, the adjusting member 110 and the support plate 102 are fixed by screws, so that the sliding member 210, the adjusting member 110 and the support plate 102 are detachably arranged, and the installation and disassembly operations are relatively convenient.

[0049] Please refer to the attached document. Figure 1-4 In some embodiments of this application, the seat assembly 1 includes a seat body 130 and a tray supported on the bottom of the seat body 130, with an adjustment support 101 extending rearward from the rear end of the tray; the backrest assembly 2 includes a backrest body 220 and a back support 230 hinged to the rear side of the backrest body 220, with the bottom end of the back support 230 hinged to a slider 210. The adjustment support 101 is part of the tray, facilitating manufacturing.

[0050] Of course, in other embodiments of this application, the adjustment support 101 may also be provided at the bottom end of the back support 230, and the slider 210 may be hinged to the tray.

[0051] Please refer to the attached document. Figure 1-4In some embodiments of this application, the tray includes a fixed tray 140 and a movable tray 150 joined together vertically. The front ends of the fixed tray 140 and the movable tray 150 are hinged to each other, allowing the movable tray 150 to rotate vertically relative to the fixed tray 140. The adjustment support 101 extends rearward from the rear end of the movable tray 150. The seat assembly 1 also includes a front support 160 hinged to the fixed tray 140, with the upper end of the front support 160 hinged to the front end of the backrest body 220. When the backrest body 220 is subjected to a backward leaning force, the back support 230 is pressed and swings backward, and the front support 160 swings backward synchronously with the back support 230. The movable tray 150 is pressed and rotates downward relative to the fixed tray 140, thereby causing the upper backrest body 220 to rotate backward by a larger angle.

[0052] In this embodiment, in addition to adjusting the tilt angle through the sliding component, the backrest body 220, the movable plate 150, the front support 160 and the back support 230 are hinged together to form a four-bar linkage structure, which not only makes the overall structure of the seat more stable, but also allows the backrest body 220 to tilt further backward at a greater angle when subjected to a reclining force, thanks to the downward rotation of the movable plate 150 and the rearward rotation of the back support 230. This allows the user to recline in a more comfortable posture and provides a more comfortable user experience.

[0053] Please refer to the appendix. Figure 11The front support 160 is symmetrically arranged on the left and right sides of the backrest body 220. The front support 160 includes a first support rod 161 and a second support rod 162 that are inclined to each other and always remain relatively fixed. The lower ends of the first support rod 161 and the second support rod 162 meet and are hinged to the left and right ends of the fixed plate 140, so that the first support rod 161 and the second support rod 162 can rotate synchronously around the fixed plate 140. The upper end of the second support rod 162 is hinged to the backrest body 220, and the upper end of the first support rod 161 is hinged to the seat body 130. When the backrest body 220 is tilted back, the first support rod 161 is driven to rotate backward by the second support rod 162, and the seat body 130 is pushed upward by the first support rod 161, so that the seat body 130 can rise with the backrest body 220, allowing the user to recline in a more comfortable posture. The rear end of the chair seat body 130 is provided with two symmetrical connecting parts 131. The two connecting parts 131 are attached to the left and right sides of the fixed plate 140. The connecting parts 131 and the fixed plate 140 are connected by a guide mechanism. The guide mechanism includes a guide groove 132 and a guide pin that slide against each other. The guide groove 132 is located in the connecting part 131, and the guide pin is located in the fixed plate 140. Thus, the chair seat body 130, the first support rod 161, the fixed plate 140, and the guide groove 132 form a structure similar to a three-bar linkage and a sliding groove. With the help of the guide pin sliding in the guide groove 132, the chair seat body 130 slides up and down relative to the fixed plate 140 and rotates back and forth in conjunction with the first support rod 161. The structure is simple and makes the transmission process between the chair seat body 130 and the first support rod 161 more stable and smooth.

[0054] 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.

[0055] 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 backrest tilt adjustment mechanism, characterized in that, The chair includes a seat assembly (1) and a backrest assembly (2). The front end of the backrest assembly (2) is rotatably connected to the seat assembly (1), and the rear end of the backrest assembly (2) and the seat assembly (1) are connected by a sliding assembly. The sliding assembly includes an adjustment support (101) and a slider (210) slidably connected to the adjustment support (101). The adjustment support (101) is disposed in one of the backrest assembly (2) and the seat assembly (1), and the slider (210) is hinged to the other of the backrest assembly (2) and the seat assembly (1). When the slider (210) slides back and forth relative to the seat assembly (1), the... The backrest assembly (2) rotates back and forth relative to the seat assembly (1); a gear adjustment assembly is also provided between the sliding member (210) and the adjustment support (101), the gear adjustment assembly includes a locking block (111) and a plurality of gear slots (211), the locking block (111) is disposed in one of the sliding member (210) and the adjustment support (101), and the plurality of gear slots (211) are disposed in the other of the sliding member (210) and the adjustment support (101); when the sliding member (210) slides back and forth relative to the adjustment support (101), the locking block (111) engages with the plurality of gear slots (211) in sequence.

2. The backrest tilt adjustment mechanism according to claim 1, characterized in that, The locking block (111) is movably connected to the adjusting support (101), and the slider (210) is provided with a plurality of gear slots (211). The gear adjusting component has a switchable locked state and an unlocked state. In the locked state, the locking block (111) slides outward to engage with the gear slot (211), so that the adjusting support (101) and the slider (210) are relatively fixed. In the unlocked state, the locking block (111) slides inward to retract into the adjusting support (101) and avoid the gear slot (211), so that the slider (210) can slide relative to the adjusting support (101) again.

3. The backrest tilt adjustment mechanism according to claim 2, characterized in that, The adjustment support (101) includes an adjustment member (110), which is a hollow structure and includes an internal mounting cavity (112). One end of the locking block (111) passes through the side wall of the adjustment member (110) and extends into the mounting cavity (112). A torsion spring (113) is provided in the mounting cavity (112). One side arm of the torsion spring (113) is connected to the locking blocks (111) on both sides, and the other side arm of the torsion spring (113) is connected to the transmission member (114). The transmission member (114) can slide in the mounting cavity (112) and drive the torsion spring (113) to pull inward or push outward the locking block (111), thereby driving the gear adjustment component to switch between the locked state and the unlocked state.

4. The backrest tilt adjustment mechanism according to claim 3, characterized in that, A wired control mechanism is provided between the seat assembly (1) and the adjustment member (110). The wired control mechanism includes an adjustment switch (120) and a pull rope connecting the adjustment switch (120) and the transmission member (114). The adjustment switch (120) is configured to adjust the pull rope to pull or release the transmission member (114), thereby driving the transmission member (114) to slide back and forth in the mounting cavity (112).

5. The backrest tilt adjustment mechanism according to claim 3, characterized in that, A spring (115) is also provided in the mounting cavity (112). The spring (115) applies a pulling force to the locking block (111), so that the locking block (111) always has a tendency to slide backward, thereby driving the locking block (111) to always have a tendency to lock into the gear slot (211).

6. The backrest tilt adjustment mechanism according to claim 1, characterized in that, The slider (210) and the adjustment support (101) are connected by a positioning structure. The positioning structure includes a first positioning groove (212) formed in one of the slider (210) and the adjustment support (101). The first positioning groove (212) extends in the front-back direction. The slider (210) is slidably connected to the adjustment support (101) through the first positioning groove (212).

7. The backrest tilt adjustment mechanism according to claim 6, characterized in that, The first positioning groove (212) is formed on the sliding member (210). The adjustment support part (101) includes an adjustment member (110). The sliding member (210) is slidably connected to the adjustment member (110) through the first positioning groove (212). The gear adjustment component is provided between the two side walls of the sliding member (210) and the two side groove walls of the first positioning groove (212).

8. The backrest tilt adjustment mechanism according to claim 1, characterized in that, The sliding member (210) is provided with a second positioning groove (213) extending in the front-back direction. The adjustment support (101) includes a support plate (102) and an adjustment member (110) detachably connected to the support plate (102). The adjustment member (110) is provided with a positioning part (116) protruding from it. The positioning part (116) passes through the second positioning groove (213) and is connected to the support plate (102), so that the sliding member (210) is clamped between the support plate (102) and the adjustment member (110), and the sliding member (210) can slide back and forth relative to the adjustment member (110) through the second positioning groove (213).

9. The backrest tilt adjustment mechanism according to claim 1, characterized in that, The seat assembly (1) includes a seat body (130) and a tray supported on the bottom of the seat body (130), and the adjustment support (101) extends rearward from the rear end of the tray; the backrest assembly (2) includes a backrest body (220) and a back support (230) hinged to the rear side of the backrest body (220), and the bottom end of the back support (230) is hinged to the slider (210).

10. The backrest tilt adjustment mechanism according to claim 9, characterized in that, The tray includes a fixed tray (140) and a movable tray (150) joined together vertically. The front ends of the fixed tray (140) and the movable tray (150) are hinged to each other, so that the movable tray (150) can rotate vertically relative to the fixed tray (140). The adjustment support (101) is formed by extending rearward from the rear end of the movable tray (150). The seat assembly (1) also includes a front support (160) hinged to the fixed tray (140). The upper end of the front support (160) is hinged to the front end of the backrest body (220). When the backrest body (220) is subjected to a backrest force, the back support (230) is pressed and swings backward. The front support (160) swings backward synchronously with the back support (230), and the movable tray (150) is pressed and rotates downward relative to the fixed tray (140), thereby driving the upper backrest body (220) to rotate backward by a larger angle.

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