A seat pan

Abstract

This invention discloses a seat chassis, including a backrest fixing frame, a base, a movable plate, a main spring, and an adjustment handle. The backrest fixing frame fixes the backrest, and the main spring is located below the base. The main spring controls the tilting force of the backrest fixing frame and causes the backrest to return to its original position. It also includes a hinge frame, the upper end of which abuts against the bottom surface of the movable plate. The hinge frame moves downward relative to the base and drives the movable plate to rotate at a certain angle relative to the base, while compressing the main spring. When the backrest is installed on the backrest fixing frame, the backrest can follow the movement of the backrest by swaying left and right and up and down, closely adhering to the backrest, providing support for various sitting postures and improving the comfort of the chair.

Description

Technical Field

[0001] This invention relates to a furniture accessory, and more particularly to a seat chassis. Background Technology

[0002] The backrests of most chairs on the market are fixed to the chassis. Adjusting the backrests involves controlling the compression of the chassis springs via a lever, which allows for adjustments to the seat height and backrest tilt. However, this does not allow for left-right tilting of the backrest. It fails to meet the requirement that the backrest remains firmly against the body when office workers twist and turn. Since the backrest supports the spine, a chair with a backrest that can swing back and forth and left and right is needed. If the backrest can remain firmly against the backrest regardless of the user's movements, it improves comfort and enhances the perceived quality of the office chair. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings and deficiencies of the prior art and provide a seat chassis that allows the backrest to swing back and forth and side to side.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] A seat chassis includes a backrest fixing frame, a base, a movable plate, a main spring, and an adjustment handle. The backrest fixing frame fixes the backrest, and the main spring is located below the base. The main spring controls the tilting force of the backrest fixing frame and causes the backrest to return to its original position. The seat chassis also includes a hinge frame, one end of which is hinged to the base, and the other end protrudes from the edge of the base. The axis of the hinge frame is fixed to a central shaft. The backrest fixing frame is mounted on the central shaft via rolling bearings. Sub-springs are provided on the left and right sides of the end of the hinge frame protruding from the edge of the base. Spring seats for the sub-springs are provided on both sides of the hinge frame and / or the backrest fixing frame. The movable plate floats above the base, and the upper end of the hinge frame abuts against the bottom surface of the movable plate. The hinge frame moves downward relative to the base, driving the movable plate to rotate at a certain angle relative to the base, while compressing the main spring.

[0006] As a further improvement to the above solution, a support lug that is hinged to the hinge frame is also included, with the hinge point between the hinge frame and the support lug located at one end of the protruding base.

[0007] As a further improvement to the above solution, the side of the hinge frame is in the shape of a "┐", and the hinge points of the base, the support lug and the hinge frame are respectively located at the two ends of the upper side of the "┐" shape. The uppermost edge of the support lug is fixedly connected to the bottom of the movable plate.

[0008] As a further improvement to the above solution, the support lug is located on the outside of the hinge frame, and the free end of the support lug is provided with a clearance hole for the adjustment handle to pass through.

[0009] Preferably, the rolling bearing protrudes from the edge of the hinge frame, the chair back fixing frame is provided with a mounting hole for the rolling bearing, and a bearing sleeve is located below the mounting hole. The bearing sleeve is used to fix the rolling bearing and lock the sub-spring in the spring seat.

[0010] Preferably, the base also has a stop lever for controlling the tilt angle of the movable disc, and the stop lever has multiple slots arranged in parallel from high to low.

[0011] Preferably, the movable disc fixes a valve stem that passes through the main spring, and the bottom surface of the valve stem is larger than the diameter of the main spring.

[0012] Preferably, the inner surface of the needle roller bearing is provided with evenly distributed needle rollers.

[0013] The present invention has the following advantages and effects compared with the prior art:

[0014] 1. When a person's back moves left and right, the chair back sways from side to side. Through the swinging of the chair back fixing frame, the rolling bearing rotates on the central shaft and compresses the sub-spring, which causes the chair back to return to its initial position. When a person leans back, the chair back moves the chair back fixing frame backward. With the help of the rolling bearing and the central shaft, the hinge frame drives the movable plate to press down and form a certain angle with the base, thereby compressing the main spring and achieving the tilting of the chair back. Therefore, the chassis of this seat can swing left and right and tilt the chair back up and down at the same time, improving the comfort of the sitter.

[0015] 2. The hinge frame, the first hinge point, the second hinge point, the support lug, and the fixed point of the movable plate form a triangle. The three of them can increase the overall stability of the backrest fixation 1. The rotation angle of the movable plate = the rotation degree of the support lug 11 relative to the hinge frame + the rotation angle of the hinge frame relative to the bottom, thereby increasing the tilt angle of the backrest and further improving comfort.

[0016] 3. The bearing sleeve can be locked to the rolling bearing and the sub-spring, simplifying the entire structure and making disassembly convenient. Attached Figure Description

[0017] Figure 1 It is a 3D view of the seat chassis.

[0018] Figure 2 This is an exploded view of the seat chassis.

[0019] Figure 3 This is a top view of the seat chassis (omitting the movable plate).

[0020] Figure 4 yes Figure 3 Side view.

[0021] Figure 5 This is a side view of the chair back support frame.

[0022] Among them, 1-backrest fixing frame; 2-base; 3-movable plate; 4-adjusting handle; 5-spring sleeve; 6-hinge frame; 7-central shaft; 8-rolling bearing; 9-sub-spring; 10-spring seat; 11-support lug; 12-bearing sleeve; 13-gear lever; 14-slot; 15-bolt; 16-washer; 17-screw; 18-needle roller; 19-clearance hole; 20-upper edge; 21-first hinge point; 22-second hinge point. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0024] Reference Figures 1-4 A seat chassis includes a backrest fixing frame 1, a base 2, a movable plate 3, a main spring, and an adjusting handle 4. The backrest fixing frame 1 is used to fix the seat back and has mounting holes for fixing the seat back. The main spring is located below the base 2 and is installed in a spring sleeve 5. When the seat back tilts, the movable plate 3 compresses the main spring, which controls the tilting force of the backrest fixing frame 1 and causes the seat back to return to its original position. To facilitate the installation of the backrest fixing frame 1, the device also includes a hinge frame 6. One end of the hinge frame 6 is hinged to the base 2, and the other end protrudes from the edge of the base 2. A central shaft 7 is fixed to the axis of the hinge frame 6. The backrest fixing frame 1 is mounted on the central shaft 7 via rolling bearings 8. Sub-springs 9 are provided on the left and right sides of the end of the hinge frame 6 that protrudes from the edge of the base 2. Spring seats 10 for the sub-springs 9 are provided on both sides of the hinge frame 6 and / or the backrest fixing frame 1. When the backrest fixing frame 1 is installed on the hinge frame 6, the sub-springs 9 are... Locked between the spring seats 10, the chair back fixing bracket 1 can swing left and right on the central shaft 7 and return to the initial position (horizontal position) through the sub-spring 9; the movable plate 3 floats above the base 2, and the upper end of the hinge bracket 6 abuts against the bottom surface of the movable plate 3. When the chair back fixing bracket is pressed down, the hinge bracket 6 is pressed down by the force of the rolling bearing 8 and the central shaft 7, and the movable plate 3 is driven to deflect downward by an angle, compressing the main spring and realizing the tilting of the chair back. When it is necessary to return the chair back to the initial position, the main spring drives the movable plate 3 to return to the horizontal position. In summary, when a person's back moves left and right, the chair back sways left and right. Through the swinging of the chair back fixing frame 1, the rolling bearing 8 rotates on the central shaft 7 and compresses the sub-spring 9. The sub-spring 9 causes the chair back to return to its initial position. When a person leans back, the chair back causes the chair back fixing frame 1 to tilt backward. With the help of the rolling bearing 8 and the central shaft 7, the hinge frame 6 drives the movable plate 3 to press down and form a certain angle with the base 2, thereby compressing the main spring and realizing the tilting of the chair back. Therefore, the chassis of this seat can swing left and right and tilt the chair back up and down at the same time.

[0025] To allow for a greater backrest swing angle, the seat chassis also includes a support lug 11 that is hinged to the hinge frame 6. The hinge point between the hinge frame 6 and the support lug 11 is located at one end of the protruding base 2. The support lug 11 and the base 2 are hinged together by bolts 15 and washers 16. The side of the hinge frame 6 is in the shape of a "┐". The hinge points of the base 2, the support lug 11, and the hinge frame 6 are located at the two ends of the upper side of the "┐" shape. The upper edge 20 of the support lug 11 is fixedly connected to the bottom of the movable plate 3. On the one hand, the first hinge point 21 between the hinge frame 6 and the base 2, the second hinge point 22 between the hinge frame 6 and the support lug 11, and the fixing point between the support lug 11 and the movable plate 3 form a triangle, which can increase the overall stability of the backrest fixing frame 1. On the other hand, when the backrest is pressed down, the backrest fixing frame 1 presses down, the support lug 11 rotates relative to the hinge frame 6, and pulls the movable plate 3. The rotation angle of the movable plate 3 = the rotation degree of the support lug 11 relative to the hinge frame 6 + the rotation angle of the hinge frame 6 relative to the base 2, thereby increasing the tilt angle of the backrest and further improving the comfort of the chair.

[0026] In order to prevent the free end of the support lug 11 from swinging excessively, the support lug 11 is located on the outside of the hinge frame 6. The free end of the support lug 11 is provided with a clearance hole 19 for passing through the adjustment handle 4. When the support lug 11 swings, its free end moves within the diameter range of the clearance hole 19.

[0027] Reference Figure 5 Another simplified structural feature of this seat chassis is that the rolling bearing 8 protrudes from the edge of the hinge frame 6, and the backrest fixing frame 1 has a mounting hole for the rolling bearing 8. Below the mounting hole is a bearing sleeve 12, which secures the rolling bearing and locks the sub-spring 9 inside the spring seat. Therefore, the bearing sleeve 12 can be locked to both the rolling bearing 8 and the sub-spring 9. When it is necessary to remove the sub-spring 9 or the rolling bearing 8, this can be achieved by removing the screw 17 below the bearing sleeve 12.

[0028] To accommodate the different needs of different people for the tilt angle of the chair back, the base 2 is also fixed with a shift lever 13 that controls the tilt angle of the movable disc 3. The shift lever 13 has multiple slots 14 arranged in parallel from high to low.

[0029] The movable disc fixes a valve stem that passes through the main spring. The bottom surface of the valve stem is larger than the diameter of the main spring. When the movable disc 3 is pressed down, the other end of the movable disc 3 pulls down the valve stem, and the bottom surface of the valve stem compresses the main spring.

[0030] In order to control the angle of the chair back swinging left and right and achieve stepped swinging, the rolling bearing 8 is a needle roller bearing, and the inner surface of the needle roller bearing is provided with evenly distributed needle rollers 18.

[0031] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A seat chassis, comprising a backrest fixing frame, a base, a movable plate, a main spring, and an adjustment handle, wherein the backrest fixing frame fixes the backrest, the main spring is disposed below the base, and the main spring controls the tilting force of the backrest fixing frame and causes the backrest to return to its original position, characterized in that, It also includes a hinge frame, one end of which is hinged to the base, and the other end protruding from the edge of the base. The axis of the hinge frame is fixed to a central shaft. The backrest fixing frame is mounted on the central shaft via rolling bearings. Sub-springs are provided on the left and right sides of the end of the hinge frame that protrudes from the edge of the base. Spring seats for the sub-springs are provided on both sides of the hinge frame and / or the backrest fixing frame. The movable plate floats above the base. The upper end of the hinge frame abuts against the bottom surface of the movable plate. The hinge frame moves downward relative to the base and drives the movable plate to rotate at a certain angle relative to the base, while compressing the main spring. It also includes a support lug that is hinged to the hinge frame, and the hinge point between the hinge frame and the support lug is located at one end of the protruding base. The side of the hinge frame is "┐" shaped. The hinge points of the base, the support lug and the hinge frame are located at the two ends of the upper side of the "┐" shape. The uppermost edge of the support lug is fixedly connected to the bottom of the movable plate. The support lug is located on the outside of the hinge frame, and the free end of the support lug is provided with a clearance hole for the adjustment handle to pass through.

2. The seat chassis according to claim 1, characterized in that, The rolling bearing protrudes from the edge of the hinge frame, and the chair back fixing frame is provided with a mounting hole for the rolling bearing. Below the mounting hole is a bearing sleeve, which is used to fix the rolling bearing and lock the sub-spring in the spring seat.

3. The seat chassis according to claim 1, characterized in that, The base also has a gear lever that controls the tilt angle of the movable disc, and the gear lever has multiple slots arranged in parallel from high to low.

4. The seat chassis according to claim 1, characterized in that, The movable disc fixes a valve stem that passes through the main spring, and the bottom surface of the valve stem is larger than the diameter of the main spring.

5. The seat chassis according to claim 1, characterized in that, The rolling bearing is a needle roller bearing, and the inner surface of the needle roller bearing is provided with evenly distributed needle rollers.

Images