Seat fore-aft adjuster with reset function

Abstract

A seat forward and backward adjuster with reset function, it includes fixed seat and the adjusting seat fixed below the seat board, the lower portion of adjusting seat is provided with accommodating area, the both sides of accommodating area extend outward and are provided with guide groove, the both sides of fixed seat extend outward and are provided with guide rail, fixed seat is slidably installed in guide groove through guide rail; it also includes anchor seat slidably installed in fixed seat, anchor seat and fixed seat are provided with tension spring, the adjusting seat is provided with mounting hole, anchor seat is clamped into mounting hole after adjusting seat and fixed seat are butted, it also includes locking device arranged between adjusting seat and fixed seat, locking device locks the relative position between adjusting seat and fixed seat.The beneficial effects of the utility model are: through the reset component composed of anchor seat and tension spring is ingeniously arranged between fixed seat and adjusting seat, so that the adjuster has automatic reset ability.

Description

Technical Field

[0001] This utility model relates to the field of chair technology, specifically a seat front and rear adjuster with a reset function. Background Technology

[0002] With modern people spending longer working and studying hours, they are placing increasingly higher demands on the comfort and functionality of chairs. Office chairs and study chairs that can adjust height, backrest angle, and fore-aft position have become widely available. Among these, the fore-aft adjustment function is crucial for accommodating users of different body types, adjusting the distance between the user and the desk, and facilitating getting up and sitting down.

[0003] Most seat fore-and-aft adjusters on the market today operate on a basic principle involving a sliding rail and a locking mechanism. Specifically, the adjuster typically includes a fixed component attached to the chair frame and a sliding component connected to the underside of the seat. These two components slide relative to each other via a sliding rail. The user can release the locking mechanism from the sliding component by operating an unlocking handle or button, and then adjust the seat's final position by moving their body forward or backward. Once the desired position is achieved, the user releases the handle, and the locking mechanism, such as a pin or latch, automatically engages with the positioning hole or slot on the sliding rail under spring pressure, thus fixing the seat in place.

[0004] However, after in-depth research and practical use of the existing technology, the inventors discovered that the above-mentioned purely manual adjustment method has the following significant drawbacks:

[0005] 1. Lack of automatic reset function and inconvenient adjustment: This is the most critical flaw in the existing technology. When a user needs to adjust the seat from a forward position to a backward position, they must rely on the strength of their buttocks and back to push the seat backward, which is strenuous and especially inconvenient for users with less strength. Similarly, when a user gets up and leaves, the seat will remain in its last used position, usually a forward position, and will not automatically return to the initial, backward state.

[0006] 2. Poor user experience and low efficiency: When a user returns to their seat or the next user prepares to sit down, they often need to manually push the "protruding" chair back to its initial position before sitting down and adjusting it. This extra step of "manual reset" increases the cumbersomeness of the operation, reduces adjustment efficiency, and results in a poor overall user experience.

[0007] 3. Impact on space utilization and aesthetics: When unused, chairs protruding from the work area occupy additional aisle space, especially in crowded places such as offices, meeting rooms, or classrooms, potentially hindering normal passage. From an overall environmental perspective, multiple chairs haphazardly placed in different positions also appear cluttered and lacking in neatness and aesthetics.

[0008] In conclusion, while existing seat fore-and-aft adjusters achieve basic adjustment functions, their purely manual adjustment method, especially the lack of an automatic reset mechanism, results in significant shortcomings in terms of adjustment convenience, usage efficiency, and space management. Therefore, further improvements are necessary. Utility Model Content

[0009] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a seat front and rear adjuster with a reset function that is more compact in structure and convenient and quick to use.

[0010] The purpose of this utility model is achieved by the following means: a seat front and rear adjuster with reset function, which includes a fixed seat fixed to the top of the bracket and an adjustment seat fixed to the bottom of the seat plate. The adjustment seat has a receiving area below it, and guide grooves are provided on both sides of the receiving area. Guide rails are provided on both sides of the fixed seat. The fixed seat is slidably installed in the guide grooves through the guide rails.

[0011] It also includes an anchor seat that is slidably installed in the fixed seat, and a tension spring is provided between the anchor seat and the fixed seat; correspondingly, the adjusting seat is provided with a mounting hole. After the adjusting seat is connected to the fixed seat, the anchor seat is inserted into the mounting hole, and the tension spring pulls the adjusting seat backward toward the fixed seat through the anchor seat.

[0012] It also includes a locking device disposed between the adjusting seat and the fixed seat, the locking device locking the relative position between the adjusting seat and the fixed seat.

[0013] Furthermore: the fixed seat has a vertical groove extending forward and backward, the anchor seat is slidably installed in the vertical groove, one end of the tension spring is hooked on the anchor seat, and the other end is hooked on the tension spring seat at the rear end of the fixed seat.

[0014] Furthermore, the anchoring seat includes a sliding block, with sliding plates extending outward on both sides of the sliding block. Correspondingly, sliding grooves are provided extending outward on both sides of the vertical groove, and the sliding plates extend into the sliding grooves to slide.

[0015] Furthermore: a pressure plate is provided below the vertical groove, and the pressure plate is installed on the fixed base; correspondingly, an inner groove is provided on the fixed base, and the pressure plate and the inner groove together form a sliding groove.

[0016] Furthermore, a lower guide groove is provided on the pressure plate at the position corresponding to the vertical groove, and a lower guide block is provided on the sliding block to slide into the lower guide groove.

[0017] Furthermore, the anchoring seat also includes a spring block that is vertically slidably installed in the sliding block. A push spring is provided between the spring block and the sliding block. The push spring pushes the spring block to always protrude upward and hook into the mounting hole.

[0018] Furthermore: the locking device includes a locking groove provided on the side wall of the adjusting seat, and a locking block is slidably installed in the locking groove;

[0019] The locking groove and the guide groove are connected. Correspondingly, several levels of stop grooves are opened on the guide rail. The locking block is connected to the unlocking handle. The unlocking handle drives the locking block to slide in the locking groove, so as to realize the docking or separation of the locking block and the stop groove.

[0020] Furthermore, a spring is provided between the locking block and the locking groove, and the spring pushes the locking block to move towards the stop groove.

[0021] Furthermore, the surface of the locking groove is covered with a cover plate.

[0022] The beneficial effects of this utility model are: 1. Simple structure, low production cost, and improved market competitiveness.

[0023] By cleverly incorporating a reset assembly consisting of an anchor and a tension spring between the fixed seat and the adjustable seat, this adjuster possesses an intelligent automatic reset capability. When the user needs to adjust the seat position or get up to leave, they simply operate the unlocking handle to unlock the locking device. Without the user applying any backward pushing force, the elastic energy stored in the tension spring is immediately released, generating a continuous, backward pulling force on the adjustable seat through the anchor, thereby driving the entire seat to automatically and smoothly slide backward to its final initial state.

[0024] Thanks to its automatic reset function, the chair automatically returns to its rearmost, most convenient position for user entry and exit, whether the user is preparing to sit down or getting up. When sitting down, there's no need to manually push the extended chair back before sitting; users can directly sit down and easily pull the chair to a suitable working position. After leaving the seat, it automatically returns to its original position, ready for the next use. The entire process eliminates the need for additional manual reset steps, greatly simplifying the operation and improving efficiency and overall comfort.

[0025] 4. This invention is particularly advantageous in settings such as offices, meeting rooms, and classrooms where seating needs to be densely packed. When not in use, all seats automatically retract to their rearmost positions, preventing aisle blockages or space occupation caused by seats remaining in different forward positions, freeing up valuable passageway space and ensuring smooth passage. Simultaneously, rows of neatly arranged, automatically returning seats make the overall environment cleaner, more orderly, and more aesthetically pleasing. Attached Figure Description

[0026] Figure 1 , 2 This is a diagram showing the final assembly and usage effect of this utility model.

[0027] Figure 3 , 4 This is an exploded view of the structure of this utility model.

[0028] Figure 5 This is a cross-sectional view of the structure of this utility model.

[0029] Figure 6 This is an exploded view of the locking device structure in this utility model.

[0030] Figure 7 This is a schematic diagram of the fixed base structure in this utility model.

[0031] Figure 8 , 9 This is an exploded view of the fixed base structure in this utility model.

[0032] Reference numerals: 1. Fixed seat; 11. Guide rail; 12. Inner groove; 13. Stop groove; 2. Adjusting seat; 21. Accommodation area; 22. Guide groove; 3. Anchor seat; 31. Sliding block; 32. Sliding plate; 33. Lower guide block; 34. Spring block; 35. Push spring; 4. Tension spring; 41. Spring seat; 5. Mounting hole; 6. Vertical groove; 61. Sliding groove; 7. Pressure plate; 71. Guide groove; 8. Locking groove; 81. Locking block; 82. Spring; 83. Cover plate. Detailed Implementation

[0033] The present invention will be further described in detail below with reference to the accompanying drawings. A seat front and rear adjuster with a reset function includes a fixed seat 1 fixed to the top of a bracket and an adjusting seat 2 fixed below the seat plate. The adjusting seat 2 has a receiving area 21 below it, and guide grooves 22 are provided on both sides of the receiving area 21. Guide rails 11 are provided on both sides of the fixed seat 1. The fixed seat 1 is slidably installed in the guide grooves 22 through the guide rails 11.

[0034] It also includes an anchor seat 3 that is slidably installed in the fixed seat 1, and a tension spring 4 is provided between the anchor seat 3 and the fixed seat 1; correspondingly, the adjusting seat 2 is provided with an installation hole 5. After the adjusting seat 2 is connected to the fixed seat 1, the anchor seat 3 is inserted into the installation hole 5, and the tension spring 4 pulls the adjusting seat 2 towards the rear of the fixed seat 1 through the anchor seat 3.

[0035] It also includes a locking device disposed between the adjusting seat 2 and the fixed seat 1, the locking device locking the relative position between the adjusting seat 2 and the fixed seat 1.

[0036] In this embodiment, the structure includes the coordinated operation of three major systems:

[0037] The sliding system consists of the guide rail 11 of the fixed seat 1 and the guide groove 22 of the adjusting seat 2, which is the basis for realizing the forward and backward movement of the seat. The fixed seat 1 is generally fixed to the chair frame, and the adjusting seat 2 is fixed under the seat plate. The two achieve relative displacement through this sliding system.

[0038] The reset system consists of an anchor seat 3, a tension spring 4, and a mounting hole 5. One end of the tension spring 4 is connected to the fixed seat 1, and the other end is connected to the anchor seat 3, which can slide within the fixed seat 1. When the adjuster is assembled, the anchor seat 3 will snap into the mounting hole 5 on the adjuster seat 2, thus establishing an "elastic connection" between the fixed seat 1 and the adjuster seat 2. This connection ensures that the tension spring 4 always applies a backward reset-direction tension to the adjuster seat 2.

[0039] Locking system: Its function is to resist the pulling force of the reset system and securely lock the adjustment seat 2 in any position required by the user.

[0040] Compared with traditional technologies, this embodiment designs a spring-driven reset system, which enables the regulator to "memorize" the initial state and automatically return to its original state, laying the foundation for a labor-saving, convenient, and intelligent adjustment experience.

[0041] In one embodiment: the fixed seat 1 has a vertical groove 6 extending forward and backward, the anchor seat 3 is slidably installed in the vertical groove 6, one end of the tension spring 4 is hooked on the anchor seat 3, and the other end is hooked on the tension spring seat 41 at the rear end of the fixed seat 1.

[0042] In this embodiment, to make the movement of the anchor seat 3 and the tension direction of the tension spring 4 more stable and controllable, a dedicated vertical channel 6 is opened inside the fixed seat 1. The anchor seat 3 is completely constrained within this vertical channel 6 and can only slide back and forth along a preset straight path. At the same time, two fixed points of the tension spring 4 are clearly defined: the moving end is connected to the anchor seat 3, and the fixed end is connected to the tension spring seat 41 at the rear end of the fixed seat 1. In this way, when the anchor seat 3 slides forward together with the adjusting seat 2, the tension spring 4 will be linearly stretched, stably storing elastic energy.

[0043] The advantage of this structural design lies in the fact that the guiding effect of the vertical groove 6 ensures the accuracy and stability of the direction of the reset force. This effectively prevents the anchor seat 3 from deflecting, tilting, or swaying under force, ensuring smooth and stable sliding. This, in turn, ensures a smooth and uninterrupted reset process, greatly improving the operational reliability and durability of the entire device.

[0044] In one embodiment: the anchor seat 3 includes a sliding block 31, and sliding plates 32 extend outward from both sides of the sliding block 31. Correspondingly, sliding grooves 61 extend outward from both sides of the vertical groove 6, and the sliding plates 32 extend into the sliding grooves 61 to slide.

[0045] In this embodiment, a "T"-shaped slide rail structure is adopted. The main body of the anchor seat 3 is located in the main space of the vertical groove 6, while the sliding plates 32 extending from both sides are embedded in the sliding grooves 61 opened on the side walls of the vertical groove 6.

[0046] Compared to a simple block sliding within a square groove, this T-shaped guide rail design significantly increases the guiding contact area and structural stability. The cooperation between the sliding plate 32 and the sliding groove 61 better restricts the anchor seat 3's movement in the vertical and horizontal directions, ensuring its extremely stable motion and precise sliding only in the forward and backward directions. This further improves the smoothness of the reset action and the guiding accuracy, effectively reducing friction and wear, and giving the product a higher quality feel.

[0047] In one embodiment: a pressure plate 7 is covered below the vertical groove 6, and the pressure plate 7 is mounted on the fixed base 1; correspondingly, an inner groove 12 is provided on the fixed base 1, and the pressure plate 7 and the inner groove 12 together form a sliding groove 61.

[0048] In this embodiment, instead of directly machining a complex T-shaped groove with an internal recess on the fixed base 1, a simple, downward-opening internal recess 12 is first machined on the fixed base 1. Then, a separate pressure plate 7 is used to cover and fix the vertical groove 6. In this way, the edge of the pressure plate 7 and the side wall of the internal recess 12 naturally enclose and form a sliding groove 61 for the sliding plate 32 to slide.

[0049] This combination of groove and cover plate design offers significant advantages in greatly simplifying the manufacturing process and reducing production costs. Machining an open inner groove is far easier than machining a closed T-slot with an internal cavity. This design not only facilitates machining but also makes subsequent assembly and maintenance easier.

[0050] In one embodiment: a lower guide groove 71 is provided on the pressure plate 7 at the position corresponding to the vertical groove 6, and a lower guide block 33 is provided on the corresponding sliding block 31, extending into the lower guide groove 71 for sliding.

[0051] In this embodiment, an additional guiding structure is added to the T-shaped guide rail. Its working principle is as follows: a lower guide groove 71 is added to the pressure plate 7, and a lower guide block 33 is correspondingly set at the bottom of the sliding block 31 of the anchor seat 3, allowing the lower guide block 33 to slide within the lower guide groove 71.

[0052] In this embodiment, the T-shaped guide rail mainly restricts the up, down, left, and right movement of the anchor seat, while the newly added lower guide rail structure can more effectively prevent the anchor seat 3 from flipping or twisting around the front and rear axes. The dual guidance completely locks the movement posture of the anchor seat, making it extremely stable and virtually eliminating any invalid shaking in any direction, ensuring smooth sliding even in extreme conditions.

[0053] In one embodiment: the anchor seat 3 further includes a spring block 34 that is vertically slidably installed in the sliding block 31. A push spring 35 is provided between the spring block 34 and the sliding block 31. The push spring 35 pushes the spring block 34 to always protrude upward and hook into the mounting hole 5.

[0054] In this embodiment, the anchoring seat 3 is not a rigid integral unit, but rather a movable bouncing block 34 installed within the sliding block 31 and constantly pushed upwards by a push spring 35. This upwardly protruding bouncing block 34 forms the locking part that ultimately engages with the mounting hole 5 of the adjusting seat 2.

[0055] This is an ingenious automatic locking and unlocking design. During assembly or sliding, when the bottom surface of the adjusting seat 2 slides past the anchor seat 3, it first presses down the spring block 34. Once the mounting hole 5 of the adjusting seat 2 moves directly above the spring block 34, the spring block 34 will automatically spring up with a "click" under the action of the push spring 35 and lock into the mounting hole 5, thus firmly establishing the connection between the reset system and the seat. This design achieves automatic engagement of the reset system without any manual intervention, demonstrating a high degree of intelligence.

[0056] In one embodiment: the locking device includes a locking groove 8 disposed on the side wall of the adjusting seat 2, and a locking block 81 is slidably installed in the locking groove 8; the locking groove 8 is connected to the guide groove 22, and correspondingly, a number of stop grooves 13 are opened on the guide rail 11; the locking block 81 is connected to the unlocking handle, and the unlocking handle drives the locking block 81 to slide in the locking groove 8, so as to realize the docking or separation of the locking block 81 and the stop groove 13.

[0057] In this embodiment: a locking block 81 is provided on the adjusting seat 2, which can slide laterally within the locking groove 8. Multiple stop grooves 13 are provided on the guide rail 11 of the fixed seat 1, allowing the locking block 81 to engage. By operating the unlocking handle connected to the locking block 81, the user can drive the locking block 81 to move laterally, thereby selectively inserting or removing its tip from a specific stop groove 13, achieving locking and unlocking.

[0058] This "locking block + multi-position slot" design offers the advantage of enabling fine-tuning across multiple positions. Users can easily find the most comfortable setting among several preset positions and reliably lock it in, based on their body size and usage habits. Compared to stepless adjustment, the positional adjustment provides a clearer sense of positioning and a more precise and reliable locking mechanism.

[0059] In one embodiment: a spring 82 is provided between the locking block 81 and the locking groove 8, and the spring 82 pushes the locking block 81 to move towards the stop groove 13.

[0060] In this embodiment, a compression spring 82 is added between the locking block 81 and the groove wall of the locking groove 8. This spring constantly pushes the locking block 81 towards extending and engaging with the stop groove 13. The operation of the unlocking handle essentially overcomes the elastic force of this spring 82. Its core advantage is a significant improvement in safety. The locking device is in a locked state by default and only unlocks when the user actively operates the handle. Once the user releases the handle, the seat will immediately and automatically lock, effectively avoiding the risk of the seat accidentally sliding due to forgetting to lock or misoperation, thus ensuring user safety.

[0061] In one embodiment, the surface of the locking groove 8 is covered with a cover plate 83.

[0062] The cover plate design protects the internal precision components of the locking device. Cover plate 83 effectively prevents external debris such as dust, hair, and liquids from entering the locking groove, avoiding problems such as lock block jamming and spring corrosion. This ensures the smoothness and reliability of the locking device during long-term use, extending the overall product lifespan.

[0063] In summary, the workflow of this utility model can be summarized as follows: 1. Initial and Reset State: When unused or after unlocking, the reset system consisting of the tension spring 4, anchor seat 3, and mounting hole 5 always functions. The reset force of the tension spring 4, through the anchor seat 3 which is already engaged with the adjusting seat 2, automatically and smoothly pulls the entire adjusting seat 2, i.e., the seat, back to its final initial position. At this time, the locking block 81 driven by the spring 82 automatically engages in the final stop groove 13, so that the seat remains stably in the fully reset state.

[0064] 2. Adjustment and Locking Process: When the user needs to move the seat forward after sitting down, first operate the unlocking handle. This action overcomes the force of the spring 82, pulling the locking block 81 out of the position slot 13, thereby releasing the lock on the adjustable seat 2. At this time, the user can easily pull the seat forward using their body strength. During the pulling process, the user will continuously resist the backward pulling force provided by the reset system. After the user pulls the seat to the desired comfortable position, simply release the unlocking handle, and the spring 82 will immediately push the locking block 81 to automatically engage in the next aligned position slot 13, firmly locking the seat in that working position.

[0065] 3. Unlocking and Automatic Reset Process: When the user needs to adjust backward or get up to leave, operate the unlocking handle again to disengage the lock block 81. Once unlocked, the user does not need to apply force backward; the powerful reset system will immediately take over. The energy released by the tension spring 4 will drive the adjustment seat 2 to slide backward automatically and at a constant speed until it returns to its initial position at the very back.

[0066] In summary, this utility model achieves a new adjustment mode of "one-button unlocking and automatic return; easy pull forward and lock upon release" by perfectly combining a constant automatic reset system and a safe and reliable multi-position locking system. It completely solves the defects of existing technologies, such as laborious adjustment and lack of automatic reset function, and brings users unprecedented convenience, safety and comfort.

[0067] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A seat fore-and-aft adjuster with a reset function, characterized in that: It includes a fixed seat (1) fixed to the top of the bracket and an adjusting seat (2) fixed to the bottom of the seat plate. The adjusting seat (2) has a receiving area (21) below it. The receiving area (21) has guide grooves (22) extending outward on both sides. The fixed seat (1) has guide rails (11) extending outward on both sides. The fixed seat (1) is slidably installed in the guide grooves (22) through the guide rails (11). It also includes an anchor seat (3) that is slidably installed in the fixed seat (1), and a tension spring (4) is provided between the anchor seat (3) and the fixed seat (1); correspondingly, the adjusting seat (2) is provided with a mounting hole (5). After the adjusting seat (2) is connected to the fixed seat (1), the anchor seat (3) is inserted into the mounting hole (5), and the tension spring (4) pulls the adjusting seat (2) towards the rear of the fixed seat (1) through the anchor seat (3); It also includes a locking device disposed between the adjusting seat (2) and the fixed seat (1), the locking device locking the relative position between the adjusting seat (2) and the fixed seat (1).

2. A seat fore-and-aft adjuster with a reset function according to claim 1, characterized in that: The fixed seat (1) has a vertical groove (6) extending forward and backward. The anchor seat (3) is slidably installed in the vertical groove (6). One end of the tension spring (4) is hooked on the anchor seat (3), and the other end is hooked on the tension spring seat (41) at the rear end of the fixed seat (1).

3. A seat fore-and-aft adjuster with a reset function according to claim 2, characterized in that: The anchoring seat (3) includes a sliding block (31), and sliding plates (32) extend outward on both sides of the sliding block (31). Correspondingly, sliding grooves (61) extend outward on both sides of the vertical groove (6), and the sliding plates (32) slide into the sliding grooves (61).

4. A seat fore-and-aft adjuster with a reset function according to claim 3, characterized in that: The vertical groove (6) is covered by a pressure plate (7), which is installed on a fixed seat (1). Correspondingly, the fixed seat (1) is provided with an inner groove (12), and the pressure plate (7) and the inner groove (12) together form a sliding groove (61).

5. A seat fore-and-aft adjuster with a reset function according to claim 4, characterized in that: The pressure plate (7) is provided with a lower guide groove (71) at the position corresponding to the vertical groove (6), and the corresponding sliding block (31) is provided with a lower guide block (33) that extends into the lower guide groove (71) and slides.

6. A seat fore-and-aft adjuster with a reset function according to claim 3, characterized in that: The anchoring seat (3) also includes a spring block (34) that is vertically slidably installed in the sliding block (31). A push spring (35) is provided between the spring block (34) and the sliding block (31). The push spring (35) pushes the spring block (34) to always protrude upward and hook into the mounting hole (5).

7. A seat fore-and-aft adjuster with a reset function according to claim 1, characterized in that: The locking device includes a locking groove (8) provided on the side wall of the adjusting seat (2), and a locking block (81) is slidably installed in the locking groove (8). The locking groove (8) is connected to the guide groove (22). Correspondingly, several levels of stop grooves (13) are opened on the guide rail (11). The locking block (81) is connected to the unlocking handle. The unlocking handle drives the locking block (81) to slide in the locking groove (8), so as to realize the docking or separation of the locking block (81) and the stop groove (13).

8. A seat fore-and-aft adjuster with a reset function according to claim 7, characterized in that: A spring (82) is provided between the locking block (81) and the locking groove (8), and the spring (82) pushes the locking block (81) to move towards the stop groove (13) at all times.

9. A seat fore-and-aft adjuster with a reset function according to claim 7, characterized in that: The surface of the locking groove (8) is covered with a cover plate (83).

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