A multi-level adjustable bottom box structure used in office chairs

Abstract

A multi-level adjustment bottom box structure used in office chairs includes a base, a rocker component for connecting to a chair back frame, and a support plate component for connecting to a chair seat frame. The base is provided with a reset mechanism for elastically resetting the chair back after the inclination angle is adjusted, and a locking mechanism for locking the chair back in the adjusted position. The reset mechanism and the locking mechanism both cooperate with the support plate component. The bottom box structure of the present invention hinges the rear end of the base and the rear end of the support plate component to the rocker component, so that the base, the rocker component and the support plate component are hinged to form a movable component that can be flipped open and closed, which facilitates the installation of the reset mechanism and the locking mechanism, and can be installed without disassembling the fixed hinge shaft and the movable hinge shaft. It has a simple structure, is easy to install, and has good industrial development prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of chair furniture, and in particular relates to a multi-stage adjustable bottom box structure used on an office chair. Background Art

[0002] Office chairs are various types of chairs used for convenience in daily work and social activities. Existing office chairs generally feature height adjustment and backrest tilt adjustment, which are typically achieved through a base box. During assembly, the chair legs are attached to the bottom of the base box, the backrest is attached to the rear, and the seat is attached to the top. Therefore, the structure of the base box plays a decisive role in the functionality of the entire office chair.

[0003] In the existing bottom box structure, since the office chair needs to realize many functions, the bottom box structure is also relatively complex, with many parts, and is difficult to produce and assemble, which is not convenient for large-scale production and application. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a multi-level adjustable bottom box structure for an office chair.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A multi-level adjustment bottom box structure used on an office chair includes a base, a rocker component for connecting to a chair back frame, and a support component for connecting to a chair seat frame. The rocker component is hinged to the rear end of the base via a fixed hinge shaft, the rear end of the support component is hinged to the rocker component via a movable hinge shaft, the front end of the support component is connected to the front end of the base by a front-to-back sliding fit, and a reset mechanism for elastically resetting the chair back after the inclination angle is adjusted and a locking mechanism for locking the chair back inclination adjustment position are provided in the base. The reset mechanism and the locking mechanism both cooperate with the support component.

[0007] As a further improvement of the present invention, the rocker member is an L-shaped structure, and the rocker member includes a seat back frame connecting portion for connecting to a seat back frame, a fixed shaft sleeve portion for connecting to a fixed hinge shaft, and a movable shaft sleeve portion for connecting to a movable hinge shaft, and the fixed shaft sleeve portion and the movable shaft sleeve portion are connected by a vertical connecting portion, and the fixed shaft sleeve portion is arranged at the connecting corner between the seat back frame connecting portion and the vertical connecting portion.

[0008] As a further improvement of the present invention, the front end of the base is locked with the front end of the support plate component through a snap-fit ​​head. The front end of the base is provided with a snap-fit ​​position for snapping the snap-fit ​​head for upper and lower limit, and the snap-fit ​​head is fixedly connected to the base.

[0009] As a further improvement of the present invention, a through position is provided below the snap-in position for the snap-in head to extend out of the connection base, the cross-sectional width of the through position is smaller than the cross-sectional width of the snap-in position, and the snap-in head includes an upper snap-in head portion for cooperating with the snap-in position and a lower snap-in head portion for extending out of the through position to connect to the base.

[0010] As a further improvement of the present invention, the reset mechanism includes a reset spring, the base is provided with a spring installation cavity for accommodating the installation of the reset spring, the bottom of the support plate component is provided with a downwardly protruding limiting surface, and the limiting surface extends into the spring installation cavity, one end of the reset spring abuts against the spring installation cavity, and the other end abuts against the limiting surface.

[0011] As a further improvement of the present invention, the locking mechanism includes a locking bar for popping up and down to realize the locking opening and closing action and a control handle for controlling the up and down popping action of the locking bar. The end of the control handle is connected to the bottom of the locking bar. The bottom of the support plate component is provided with a plurality of lock grooves for cooperating with the locking bar to realize the locking action. The plurality of lock grooves are evenly spaced along the front and rear directions of the support plate component.

[0012] As a further improvement of the present invention, the locking mechanism further includes a slot member for cooperating with the lock bar to achieve movement limitation, the slot member is fixed on the base, and the slot member is provided with a through slot for the lock bar to pass through.

[0013] As a further improvement of the present invention, the locking bars are provided with a plurality of bars, the structure of the locking bars is adapted to the structure of the locking slots, and the spacing between adjacent locking bars is the same as the spacing between adjacent locking slots.

[0014] As a further improvement of the present invention, the base is provided with an upwardly protruding guide plate, and the bottom of the supporting plate component is provided with a guide groove for cooperating with the guide plate.

[0015] The beneficial effects of the present invention are: the bottom box structure of the present invention hinges the rear end of the base and the rear end of the support plate component to the seesaw component, so that the base, the seesaw component and the support plate component are hinged to form a movable component that can be flipped open and closed, which facilitates the installation of the reset mechanism and the locking mechanism, and can be installed without disassembling the fixed hinge shaft and the movable hinge shaft. It has a simple structure, is easy to install, and has good industrial development prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a three-dimensional diagram of the installation of the base box and the chair back frame of this embodiment;

[0017] Figure 2 This is a side structural diagram of the installation of the bottom box and the chair back frame in this embodiment;

[0018] Figure 3 This is a three-dimensional diagram of the bottom box of this embodiment;

[0019] Figure 4 This is a schematic diagram of the side structure of the bottom box of this embodiment;

[0020] Figure 5 Schematic diagram of the internal structure of the bottom box of this embodiment;

[0021] Figure 6 Schematic diagram of the structure of the seesaw member of this embodiment;

[0022] Figure 7 Schematic diagram of the structure of the support plate component of this embodiment;

[0023] Figure 8 Schematic diagram of the structure of the locking head of this embodiment;

[0024] Figure 9 Schematic diagram of the structure of the base of this embodiment;

[0025] Figure 10 Schematic diagram of the structure of the locking mechanism of this embodiment;

[0026] Figure 11 This is an exploded view of the locking mechanism of this embodiment. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0028] Example:

[0029] like Figures 1 to 11As shown, this embodiment discloses a multi-level adjustment bottom box structure applied to an office chair, including a base 1, a rocker member 2 for connecting a chair back frame and a support member 3 for connecting a chair seat frame, the rocker member 2 is hinged to the rear end of the base 1 by a fixed hinge shaft 4, the rear end of the support member 3 is hinged to the rocker member 2 by a movable hinge shaft 5, the front end of the support member 3 is connected to the front end of the base 1 by a front-to-back sliding fit, thereby forming a crank slider motion mechanism, wherein the base 1 serves as a frame in the crank slider motion mechanism, the rocker member 2 serves as a crank in the crank slider motion mechanism, and the support member 3 serves as a connecting rod in the crank slider motion mechanism, and the front end of the support member 3 is connected to the front end of the base 1 by a front-to-back sliding fit as a slider, so that the rocker member 2 and the support member 3 realize the mutual conversion movement of rotation and movement, so that when the chair back is adjusted to tilt forward and backward, the seat will also move forward and backward synchronously, thereby maintaining the distance between the seat and the chair back, and the office chair maintains good riding comfort. The base 1 is provided with a reset mechanism 6 for elastically restoring the seat back after the seat back angle is adjusted, and a locking mechanism 7 for locking the seat back angle adjustment position. The reset mechanism 6 and the locking mechanism 7 both cooperate with the support member 3. When adjusting the seat back angle, there are two modes: rearward adjustment and forward adjustment:

[0030] 1. The working principle of the chair back reclining adjustment is as follows: the locking mechanism 7 is unlocked, the human body leans back against the chair back, the rocker member 2 swings backward along with the chair back around the fixed hinge shaft 4, the rocker member 2 pulls the support member 3 backward through the movable hinge shaft 5, and the seat also moves backward along with the support member 3, the reset mechanism 6 elastically deforms to store elastic potential energy, and finally the locking mechanism 7 is used to lock the seat;

[0031] 2. The working principle of the chair back tilt adjustment is as follows: the locking mechanism 7 is unlocked, the human body leans forward so that the back is separated from the chair back, the reset mechanism 6 is elastically reset, pushing the support member 3 to move forward, the support member 3 drives the rocker member 2 to swing forward through the movable hinge shaft 5, the chair back tilts forward with the rocker member 2 around the fixed hinge shaft 4, and the seat also moves forward with the support member 3, and finally locked by the locking mechanism 7.

[0032] As a preferred embodiment, the rocker member 2 is an L-shaped structure, and the rocker member 2 includes a seat back frame connecting portion 21 for connecting to a seat back frame, a fixed shaft sleeve portion 22 for connecting to a fixed hinge shaft 4, and a movable shaft sleeve portion 23 for connecting to a movable hinge shaft 5. The fixed shaft sleeve portion 22 and the movable shaft sleeve portion 23 are connected by a vertical connecting portion 24. The fixed shaft sleeve portion 22 is arranged at the connecting corner of the seat back frame connecting portion 21 and the vertical connecting portion 24. The seat back frame connecting portion 21 and the vertical connecting portion 24 are arranged perpendicular to each other, so that the overall structural strength of the rocker member 2 is improved, which facilitates the application of force to the rocker member 2 when adjusting the seat back, and makes seat back adjustment easier.

[0033] As a preferred embodiment, the front end of the base 1 is locked with the front end of the support plate member 3 through a snap-fit ​​head 8. The front end of the base 1 is provided with a snap-fit ​​position 31 for snapping into the snap-fit ​​head 8 for upper and lower limit, and the snap-fit ​​head 8 is fixedly connected to the base 1. A through position 32 for the snap-fit ​​head to extend and connect to the base 1 is provided below the snap-fit ​​position 31. The cross-sectional width of the through position 32 is smaller than the cross-sectional width of the snap-fit ​​position 31. The snap-fit ​​head 8 includes an upper snap-fit ​​head 81 for cooperating with the snap-fit ​​position 31 and a lower snap-fit ​​head 82 for extending from the through position 32 to connect to the base 1. The upper snap-fit ​​head 81 cooperates with the snap-fit ​​position 31 to form a slider rail guide structure for the support plate member 3 to move forward and backward. At the same time, the lower snap-fit ​​head 82 cooperates with the through position 32 to also form a slider rail guide structure for the support plate member 3 to move forward and backward, forming a double guide structure. In addition, the snap-fit ​​head 8 also has a limiting function in the up-down direction. The snap-fit ​​head 8 is used as a locking member between the support plate member 3 and the base 1 in the up-down direction. When performing the locking action, the support plate member 3 is flipped downward so that the support plate member 3 is covered on the base 1. Then, the snap-fit ​​head 8 is used to snap its upper snap-fit ​​portion 81 into the snap-fit ​​position 31, and the lower snap-fit ​​portion 82 extends from the through position 32 and is fixed to the base 1. Since the cross-sectional width of the through position 32 is smaller than the cross-sectional width of the snap-fit ​​position 31, a step position is formed at the bottom of the snap-fit ​​position 31, so that the support plate member 3 and the base 1 can be locked in the up-down direction through the snap-fit ​​head 8. When the support plate member 3 is separated from the base 1, it can also be achieved by removing the snap-fit ​​head 8, which is very convenient for disassembly and assembly.

[0034] As a preferred embodiment, the reset mechanism 6 includes a reset spring, the base 1 is provided with a spring installation cavity 11 for accommodating the installation of the reset spring, the bottom of the support plate member 3 is provided with a downwardly protruding limiting surface 33, and the limiting surface 33 extends into the spring installation cavity 11. One end of the reset spring abuts against the spring installation cavity 11, and the other end abuts against the limiting surface 33. The top surface and front side openings of the spring installation cavity 11, the top surface opening serves as the loading port of the reset spring, and the reset spring abuts against the rear side wall member of the spring installation cavity 11 to elastically connect the reset spring with the base 1, and the front side opening is used for the limiting surface 33 to extend downward to construct an elastic connection between the reset spring and the support plate member 3.

[0035] As a preferred embodiment, the locking mechanism 7 includes a locking bar 71 for popping up and down to achieve locking and opening and closing, and a control handle 72 for controlling the popping-up movement of the locking bar 71. The end of the control handle 72 is connected to the bottom of the locking bar 71. The bottom of the support member 3 is provided with a plurality of locking slots 34 for cooperating with the locking bar 71 to achieve locking. The plurality of locking slots 34 are evenly spaced along the front-to-back direction of the support member 3. The locking mechanism 7 also includes a slot member 73 for cooperating with the locking bar 71 to achieve movement limit. The slot member 73 is fixed to the base 1 and defines a through slot 731 for the locking bar 71 to pass through. The slot member 73 ensures stable operation of the locking bar 71 when it moves up and down, provides support for the locking force of the locking bar 71, and limits the position of the locking bar 71 when it pops up, preventing the locking bar 71 from popping out excessively. The locking bar 71 is provided with a plurality of bars, the structure of which matches the structure of the locking slots 34, and the spacing between adjacent locking bars 71 is the same as the spacing between adjacent locking slots 34. The lock bar 71 pops out and locks with different lock slots 34, completing the adjustment and locking action of different gears. Specifically, the control handle 72 is hinged to the side of the base 1 via a handle hinge shaft 74. The control handle 72 includes a handle hinge portion 721 connected to the handle hinge shaft 74, a spring 722 extending from the handle hinge portion 721 to the bottom of the lock bar 71, and a handle portion 723 extending from the handle hinge portion 721 to the outside of the base 1. A stopper 75 is provided on one side of the handle portion 723 for locking the control handle 72 in the locked state. The stopper 75 has two upper and lower latching positions 751 defined therein, and a latching post 724 is provided on one side of the handle portion 723 to engage with the latching position. A tooth groove 711 is provided at the bottom of the lock bar 71 for receiving and connecting the spring 722. By moving the handle portion 723 up and down, the user can control the upward and downward movement of the lock bar 71 via the spring 722, thereby locking or disengaging it from the lock slot 34. The user bends the handle 723 upward, and the post 724 of the handle 723 moves upward and gets stuck in the upper position. The spring piece 722 pries the lock bar 71 downward, and the lock bar 71 disengages from the lock slot 34, thereby allowing the support member 3 to move forward and backward, and the chair back to be adjusted forward and backward. Similarly, the user bends the handle 723 downward, and the post 724 of the handle 723 moves downward and gets stuck in the lower position. The spring piece 722 pries the lock bar 71 upward, and the lock bar 71 locks with the lock slot 34, thereby locking the support member 3 in the forward and backward direction and the chair back.

[0036] As a further improvement of the present invention, the base 1 is provided with an upwardly protruding guide plate 12, and the bottom of the support plate member 3 is provided with a guide groove 35 for cooperating with the guide plate 12. The support plate member 3 is provided with a hinge hole for connecting the movable hinge shaft 5, the aperture of the hinge hole is equal to the outer diameter of the movable hinge shaft 5, and the aperture of the movable shaft sleeve portion 23 is larger than the outer diameter of the movable hinge shaft 5, so that when the seesaw member 2 rotates, it is decomposed into movement in the up and down directions and movement in the front and back directions. The amount of movement in the up and down directions is offset by the gap between the movable hinge shaft 5 and the movable shaft sleeve portion 23, and the amount of movement in the front and back directions is offset by driving the support plate member 3 to move back and forth, thereby achieving the support plate member 3 to maintain horizontal front and back movement.

[0037] The above descriptions are merely preferred embodiments of the present invention. Any technical solution that achieves the purpose of the present invention by substantially the same means shall fall within the scope of protection of the present invention.

Claims

1. A multi-level adjustable bottom box structure for an office chair, characterized by: The invention comprises a base (1), a seesaw member (2) for connecting to a chair back frame, and a support member (3) for connecting to a chair seat frame, wherein the seesaw member (2) is hinged to the rear end of the base (1) via a fixed hinge shaft (4), the rear end of the support member (3) is hinged to the seesaw member (2) via a movable hinge shaft (5), the front end of the support member (3) is connected to the front end of the base (1) by a front-to-back sliding fit, the base (1) is provided with a reset mechanism (6) for elastic reset of the chair back after the inclination angle is adjusted, and a locking mechanism (7) for locking the position of the chair back after the inclination angle is adjusted, and the reset mechanism (6) and the locking mechanism (7) both cooperate with the support member (3); The seesaw member (2) is an L-shaped structure, and the seesaw member (2) includes a seat back frame connecting portion (21) for connecting to a seat back frame, a fixed shaft sleeve portion (22) for connecting to a fixed hinge shaft (4), and a movable shaft sleeve portion (23) for connecting to a movable hinge shaft (5), wherein the fixed shaft sleeve portion (22) and the movable shaft sleeve portion (23) are connected via a vertical connecting portion (24), and the fixed shaft sleeve portion (22) is arranged at a connecting corner between the seat back frame connecting portion (21) and the vertical connecting portion (24), and the seat back frame connecting portion (21) and the vertical connecting portion (24) are arranged perpendicular to each other; The front end of the base (1) is locked with the front end of the support plate member (3) through a snap-fit ​​head (8); the front end of the base (1) is provided with a snap-fit ​​position (31) for snapping into the snap-fit ​​head (8) for upper and lower limit, and the snap-fit ​​head (8) is fixedly connected to the base (1); a through position (32) for the snap-fit ​​head to extend and connect to the base (1) is provided below the snap-fit ​​position (31); the cross-sectional width of the through position (32) is smaller than the cross-sectional width of the snap-fit ​​position (31); the snap-fit ​​head (8) includes an upper snap-fit ​​head portion (81) for cooperating with the snap-fit ​​position (31) and a lower snap-fit ​​head portion (82) for extending from the through position (32) to connect to the base (1); The reset mechanism (6) includes a reset spring, the base (1) is provided with a spring installation cavity (11) for accommodating the reset spring, the bottom of the support plate member (3) is provided with a downwardly protruding limit surface (33), the limit surface (33) extends into the spring installation cavity (11), one end of the reset spring abuts in the spring installation cavity (11), and the other end abuts on the limit surface (33); the top surface and the front side of the spring installation cavity (11) are open, the top surface opening serves as an inlet for the reset spring, the reset spring abuts against the rear side wall member of the spring installation cavity (11) to elastically connect the reset spring with the base (1), and the front side opening is used for the limit surface (33) to extend downward to construct an elastic connection between the reset spring and the support plate member (3).

2. The multi-level adjustable bottom box structure for an office chair according to claim 1, characterized in that: The locking mechanism (7) comprises a locking bar (71) for popping up and down to realize the locking opening and closing action, and a control handle (72) for controlling the popping up and down action of the locking bar (71), the end of the control handle (72) is connected to the bottom of the locking bar (71), and the bottom of the support plate member (3) is provided with a plurality of locking grooves (34) for cooperating with the locking bar (71) to realize the locking action, and the plurality of locking grooves (34) are evenly spaced along the front-to-back direction of the support plate member (3).

3. The multi-level adjustable bottom box structure for an office chair according to claim 2, characterized in that: The locking mechanism (7) further comprises a slot member (73) for cooperating with the locking bar (71) to achieve movement limitation, wherein the slot member (73) is fixed on the base (1), and the slot member (73) is provided with a through slot (731) for the locking bar (71) to pass through.

4. The multi-level adjustable bottom box structure for an office chair according to claim 2, characterized in that: The locking bars (71) are provided with a plurality of bars, the structure of the locking bars (71) is adapted to the structure of the locking slots (34), and the spacing between adjacent locking bars (71) is the same as the spacing between adjacent locking slots (34).

5. The multi-level adjustable bottom box structure for an office chair according to claim 1, characterized in that: The base (1) is provided with an upwardly protruding guide plate (12), and the bottom of the support plate component (3) is provided with a guide groove (35) for cooperating with the guide plate (12).

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