An adjustable firmness seat for an ergonomic office chair

Abstract

The utility model discloses a seat of adjustable hardness for human engineering office chair, including base and cover seat board on base, be equipped with the accommodation cavity in the base, and the bottom disc is arranged in the middle part of accommodation cavity, and the left and right sides of bottom disc are arranged gear component and sliding component respectively, the elastic piece is erected between gear component and sliding component, the elastic piece is connected with seat board and is assembled, gear component is inserted with the one side of base screw cooperation, and the rotation of screw drives the linear movement between gear component and sliding component, to adjust the deformation of elastic piece and the hardness of seat board. The cooperation of screw, gear control block and sliding block can realize the adjustment of the sinking distance of elastic piece to change the hardness of seat. The composite support of polyurethane (PU) foam and elastic piece can evenly distribute the pressure of ischial tuberosity and thigh, and make the peak ischial pressure keep below 60mmHg.

Description

Technical Field

[0001] This utility model belongs to the field of office chair technology, specifically relating to an adjustable firmness seat for ergonomic office chairs. Background Technology

[0002] Traditional office chairs offer a variety of adjustments (such as lumbar support, recline angle, and seat depth), but the seat firmness is usually fixed. This leads to the discomfort of "one size fits all" and poor pressure distribution in the ischial tuberosities.

[0003] Therefore, there is an urgent need to design an adjustable firmness seat to improve pressure distribution and comfort, while adapting to different human body data and weights (50–110 kg). Utility Model Content

[0004] To overcome the shortcomings of the existing technology, the present invention aims to provide a technical solution for an adjustable firmness seat for an ergonomic office chair, which can adjust the firmness of the seat while keeping the maximum pressure on the ischial tuberosity at 60 mmHg or below, ensuring that the total sinking distance of the seat for users with a weight range of 50–110 kg is 7–10 cm, and that the durability reaches at least 120,000 cycles.

[0005] To achieve the above objectives, the specific technical solution of this utility model is as follows: An adjustable-firm seat for an ergonomic office chair includes a base and a seat plate covering the base. The base has a receiving cavity, and a chassis is located in the center of the receiving cavity. A stop assembly and a sliding assembly are respectively arranged on the left and right sides of the chassis. An elastic element is mounted between the stop assembly and the sliding assembly, and the elastic element is snapped into the seat plate. The stop assembly cooperates with a lead screw inserted into one side of the base. The rotation of the lead screw drives linear movement between the stop assembly and the sliding assembly to adjust the deformation of the elastic element and thus adjust the firmness of the seat plate.

[0006] Furthermore, the gear shift assembly includes a gear shift seat and a gear shift control block, the gear shift control block being placed inside the gear shift seat and being linearly movable within the gear shift seat.

[0007] Furthermore, the gear control block is provided with threaded holes for the insertion of the lead screw; protrusions on both sides of the gear control block are provided to slide in the grooves on the inner wall of the gear seat; and rollers are embedded in the gear control block, with both ends of the rollers placed in the stroke slots on both sides of the gear seat; the grooves are parallel to the stroke slots and have the same length.

[0008] Furthermore, the elastic element is a leaf spring, one end of which is disposed on the roller. The rotation of the lead screw drives the gear control block to move linearly along the slide groove and the stroke slot, while simultaneously causing the leaf spring to deform.

[0009] Furthermore, the sliding assembly includes a slider seat and a slider, with the slider placed inside the slider seat; the upper part of the slider is provided with a slot and the lower part is embedded with a rotating shaft, with both ends of the rotating shaft placed in long slots provided on the side walls of the slider seat and movable along the long slots; the other end of the leaf spring is inserted into the slot.

[0010] Furthermore, at least one spring is provided between the slider and the chassis, with one end of the spring connected to the slider and the other end sleeved with a mounting post provided on the chassis.

[0011] Furthermore, a snap-fit ​​element is provided on the upper end face of the elastic element, and the snap-fit ​​element engages with a snap-fit ​​groove provided on the lower end face of the base plate.

[0012] Furthermore, a buffer layer is provided on the seat plate, and the buffer layer is a polyurethane foam layer.

[0013] Compared with the prior art, the present invention has the following advantages: This application utilizes a lead screw, a gear control block, and a slider to convert rotational motion into controlled linear movement, enabling adjustment of the sinking distance of the elastic element (i.e., the deformation of the elastic element), thereby altering the seat's firmness. The composite support of polyurethane (PU) foam and the elastic element evenly distributes pressure on the ischial tuberosities and thighs, keeping peak ischial pressure below 60 mmHg. This seat provides personalized comfort, is suitable for users weighing 50–110 kg, can withstand ≥120,000 cycles, and is cost-effective. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the seat structure of this utility model; Figure 2 This is an assembly diagram of the gear shift assembly, sliding assembly, and elastic element of this utility model; Figure 3 This is an assembly diagram of the seat plate, stop assembly, sliding assembly and elastic element of this utility model; Figure 4 This is a cross-sectional view of the seat of this utility model; Figure 5 This is an assembly diagram of the gear shift assembly and the sliding assembly of this utility model; Figure 6 This utility model Figure 4 Enlarged view of point A in the middle; Figure 7This is a schematic diagram of the slider of this utility model.

[0015] In the diagram: 1-base, 2-seat plate, 3-chassis, 31-mounting column, 4-gear assembly, 41-gear seat, 411-slide groove, 412-stroke slot, 42-gear control block, 43-roller, 5-sliding assembly, 51-slider seat, 511-long slot, 52-slider, 521-slot, 53-rotating shaft, 54-spring, 6-elastic element, 7-lead screw, 8-clamping element, 9-buffer layer. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0017] like Figures 1-7 As shown, an adjustable-firm seat for an ergonomic office chair includes a base 1 and a seat plate 2 covering the base 1. The base 1 has a receiving cavity, and a chassis 3 is set in the middle of the receiving cavity. A stop assembly 4 and a sliding assembly 5 are respectively set on the left and right sides of the chassis. An elastic element 6 is strung between the stop assembly 4 and the sliding assembly 5. The elastic element 6 is snapped into the seat plate 2. The stop assembly 4 cooperates with a lead screw 7 inserted into one side of the base 1. The rotation of the lead screw 7 drives the linear movement between the stop assembly 4 and the sliding assembly 5 to adjust the deformation of the elastic element 6 and the firmness of the seat plate 2.

[0018] Specifically, the elastic element 6 is a leaf spring. The gear shift assembly 4 includes a gear shift seat 41 and a gear shift control block 42. The gear shift control block 42 is placed inside the gear shift seat 41 and can move linearly along the gear shift seat 41. In a specific embodiment, the gear shift control block 42 is provided with a threaded hole for the insertion of the lead screw 7; protrusions on both sides of the gear shift control block 42 are provided to slide in a groove 411 on the inner wall of the gear shift seat 41; and rollers 43 are embedded in the gear shift control block 42, with both ends of the rollers 43 placed in the stroke slots 412 provided on both sides of the gear shift seat 41; the grooves 411 and the stroke slots 412 are parallel and have the same length. It can be understood that the rotation of the lead screw 7 can drive the gear shift control block 42 to move linearly along the grooves 411 and the stroke slots 412. The stroke slots 412 are corrugated holes, which have a locking effect. The sliding assembly 5 includes a slider seat 51 and a slider 52, with the slider 52 housed within the slider seat 51. The upper part of the slider 52 has a slot 521, and the lower part has a rotating shaft 53 embedded therein. Both ends of the rotating shaft 53 are located within elongated slots 511 on the side walls of the slider seat 51, and can move along these slots. One end of the elastic element 6 is inserted into the slot 521. At least one spring 54 is provided between the slider 52 and the base 3. One end of the spring 54 is connected to the slider 52, and the other end is sleeved with a mounting post 31 on the base 3.

[0019] In this application, one end of the elastic element 6 is mounted on the roller 43. The rotation of the lead screw 7 causes the gear control block 42 to move linearly along the slide groove 411 and the stroke slot 412, while simultaneously causing the elastic element 6 to deform (i.e., the rotation of the lead screw 7 changes the preload of the elastic element 6, thereby adjusting the seat hardness). The lead screw 7 adjusts the overall seat hardness by changing the preload and curvature of the elastic element. In one embodiment, the elastic element 6 is made of PA6 GF30 material.

[0020] Additionally, a snap-fit ​​element 8 is provided on the upper end face of the elastic element 6, which engages with a snap-fit ​​groove provided on the lower end face of the seat plate 2. A cushioning layer 9 is provided on the seat plate 2, which is composed of a polyurethane (PU) foam layer with a density of 64 kg / m³ and has slotted holes at the bottom to improve pressure distribution. In one specific embodiment, the elastic element 6 consists of a leaf spring made of PA6 GF30, and the cooperation between the elastic element 6 and the cushioning layer 9 is designed to keep the maximum pressure on the ischial tuberosity not exceeding 60 mmHg. The seat is designed to achieve a total seat sinking of 7–10 cm within the user weight range of 50–110 kg; and to withstand at least 120,000 cycles without significant structural degradation.

[0021] The seat in this application has been tested and exhibits the following key features: ① Peak pressure: ≤ 60 mmHg; ② Seat sinking distance: 7–10 cm; ③ Durability: ≥ 120,000 cycles; ④ User weight range: 50–110 kg; ⑤ Material: PA6 GF30 (leaf spring); ⑥ Material: Polyurethane foam (cushioning material) with a density of 64 kg / m³.

[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An adjustable-firm seat for an ergonomic office chair, comprising a base (1) and a seat plate (2) covering the base (1), characterized in that, The base (1) has a receiving cavity, and a chassis (3) is set in the middle of the receiving cavity. A gear shift assembly (4) and a sliding assembly (5) are respectively set on the left and right sides of the chassis (3). An elastic element (6) is installed between the gear shift assembly (4) and the sliding assembly (5). The elastic element (6) is snapped into the seat plate (2). The gear shift assembly (4) cooperates with a lead screw (7) inserted on one side of the base (1). The rotation of the lead screw (7) drives the linear movement between the gear shift assembly (4) and the sliding assembly (5) to adjust the deformation of the elastic element (6) to adjust the hardness of the seat plate (2).

2. The adjustable firmness seat for an ergonomic office chair according to claim 1, characterized in that, The gear position assembly (4) includes a gear position seat (41) and a gear position control block (42). The gear position control block (42) is placed inside the gear position seat (41) and can move linearly along the gear position seat (41).

3. The adjustable firmness seat for an ergonomic office chair according to claim 2, characterized in that, The gear control block (42) is provided with threaded holes for the screw (7) to be inserted into; the gear control block (42) is provided with protrusions on both sides to slide in cooperation with the sliding groove (411) on the inner wall of the gear seat (41); and the gear control block (42) is provided with rollers (43), the two ends of which are placed in the stroke slots (412) provided on both sides of the gear seat (41); the sliding grooves (411) are parallel to the stroke slots (412) and have the same length.

4. The adjustable firmness seat for an ergonomic office chair according to claim 3, characterized in that, The elastic element (6) is a leaf spring, one end of which is mounted on the roller (43). The rotation of the lead screw (7) causes the gear control block (42) to move linearly along the slide groove (411) and the stroke slot (412), while simultaneously causing the leaf spring to deform.

5. An adjustable-firm seat for an ergonomic office chair according to claim 4, characterized in that, The sliding assembly (5) includes a slider seat (51) and a slider (52). The slider (52) is placed inside the slider seat (51). The upper part of the slider (52) is provided with a slot (521) and the lower part is embedded with a rotating shaft (53). Both ends of the rotating shaft (53) are placed in the long slots (511) provided on the side walls of the slider seat (51) and can move along the long slots (511). The other end of the leaf spring is inserted into the slot (521).

6. The adjustable-firm seat for an ergonomic office chair according to claim 5, characterized in that, At least one spring (54) is provided between the slider (52) and the chassis (3). One end of the spring (54) is connected to the slider (52), and the other end is sleeved with the mounting post (31) provided on the chassis (3).

7. An adjustable-firm seat for an ergonomic office chair according to any one of claims 1-6, characterized in that, The upper end face of the elastic member (6) is provided with a snap-fit ​​member (8), which engages with the snap-fit ​​groove provided on the lower end face of the base plate (2).

8. An adjustable-firm seat for an ergonomic office chair according to claim 7, characterized in that, A buffer layer (9) is provided on the seat plate (2), and the buffer layer (9) is a polyurethane foam layer.

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