CN115413901A - Chassis device of chair conforming to ergonomics - Google Patents

Abstract

The invention discloses a chassis device of an ergonomic chair, comprising: a base; a seesaw configured to connect the back of a chair; a seat connector configured to connect to the seat; a rear end of the seat connector connected to the seesaw There are synchronous pins; the sinking guide mechanism includes an inclined guide groove set on the base and a guide rod set on the seat connector; the front end of the seat connector follows the seesaw movement to make the guide rod slide along the inclined guide groove; the initial state Down, the seat connector is in a horizontal state, and the guide rod is located at the front upper end of the inclined guide groove; in the reclined state, the seesaw follows the back of the chair and drives the rear end of the seat connector to move downward and backward; the front end of the seat connector moves along the slope The guide groove slides backwards and downwards; the seat connecting piece sinks relative to the base as a whole and moves backward; the seat connecting piece moves to a tilted state where the front is high and the rear is low; The sinking height of the front end of the seat connector partly or completely offsets the tilting height of the front end of the seat seat.

Description

Chassis device for an ergonomic chair

technical field

The invention relates to the field of seats, in particular to a chassis device of an ergonomic chair.

Background technique

Swivel chairs are an indispensable living tool for home life and office environment. Not only do the chairs used in home life have higher and higher comfort requirements, but even the office environment has an impact on the comfort and operability of the swivel chair under the premise of work efficiency. Obvious upgrade requirements. The current swivel chair has the functions of lifting, tilting and rotating. The swivel chair is mainly composed of chair feet, air pressure rod, cylinder, chassis structure, seat, and backrest; the swivel chair chassis is an important part installed under the seat seat; The lifting of the seat and the adjustment of the reclining angle of the seat back all rely on the chassis to complete. With the improvement of people's living standards, people's demand for the comfort of swivel chairs is also increasing. The existing swivel chairs have the function of synchronous linkage between the seat and back, which means that the seat and the backrest operate synchronously when reclined. , to achieve the linkage effect of engineering and improve the comfort of use.

The chassis structure of the existing swivel chair usually includes a base, a bracket and a seesaw; the seesaw follows the back of the chair, and the bracket is connected to the seat; the current common movement mode of the synchronous linkage chassis of the swivel chair is that the seesaw is tilted back while the support The angle of the bracket rotates relative to the base changes; and when the angle of the bracket changes, the bracket tends to tilt up relative to the base; thus causing the front end of the seat to tilt up, and the user's thigh appears to be lifted.

For example, the utility model patent of CN202021272846.8 discloses "a seat chassis mechanism and seat", including a base, a bracket and a seesaw; The first pin is the fulcrum to rotate around the base; the second pin is inserted between the front end of the seesaw and the rear end of the base to make the seesaw rotate around the base with the second pin as the rotation axis; between the rear end of the bracket and the rear end of the seesaw There is a linkage structure between them, the linkage structure includes the third pin shaft passing through the bracket and the seesaw, and the track groove used to guide the movement track of the seesaw; the track groove is set on both sides of one of the seesaw or the bracket and the third pin is installed in the track groove; the bracket has a forward tilt and a backward tilt state. When the bracket is tilted forward, the third pin slides along the track groove and acts on the seesaw, so that the seesaw When the bracket is tilted backward, the third pin slides along the track groove and acts on the rocker, so that the rear end of the rocker is turned downward synchronously; the seat realizes the synchronization of the seat and the back. Tilt. Although the chassis mechanism can realize the synchronous tilting motion of the chair back and the seat seat, the seat seat is obviously raised after reclining, causing the front end of the seat seat to push up the human thigh, which undoubtedly makes the user uncomfortable to use and affects the user's legs. If you use it for a long time, it will easily lead to numbness in the user's legs and cause damage to the knee joint.

In addition, there are also some seats with synchronous tilting chassis, which only consider the angle change of the seat seat; when the seat back and the seat seat are tilted, the two distance changes in the front and rear directions are not considered; When the back is reclined, the front-to-back distance between the seat and the seat changes, and the relative displacement and friction between the chair back and the user's back will cause discomfort, so that the seat back, especially the lumbar support, is detached from the human body's waist during the user's reclining process. Or directly form a suspension gap, causing the seat to lose support to the human waist in the reclined state, and the waist has a sense of suspension, which is what we commonly call "running waist". As a result, the human spine cannot be effectively supported, resulting in many sedentary health problems, and the rest cannot be well relaxed.

From the above, it can be seen that for an ergonomic chassis, the synchronous tilting motion of the seat and back is only the simplest requirement; it is also necessary to consider the displacement changes of the seat in the front, back and up and down directions; so that the linkage between the back and the seat Only when the linkage effect of engineering is truly achieved can the comfort of the seat be improved.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings in the above-mentioned prior art, and provide a chassis device of an ergonomic chair; a sinking guide mechanism is provided between the front end of the seat connector and the base, and the sinking guide mechanism When the rocker is tilted back, the front end of the seat connector will move downward and backward; so that in the backward state, the seat connector as a whole will sink relative to the base and move backward; the seat connector will move from the horizontal state To the inclination state of front high and rear low; correspondingly, the seat base will follow the seat connecting piece to tilt and lift the front end of the seat seat up; since the front end of the seat connecting piece sinks, then the front end of the seat connecting piece sinks to a height of It will offset all or part of the tilted upward height of the front end of the seat; so that the front end of the seat will not press the user's thigh upward when reclined, and will not affect the user's comfort.

Technical scheme of the present invention is realized like this:

A chassis device for an ergonomic chair, comprising: a base configured to connect to an air rod; a rocker configured to connect to a chair back; the rocker is rotatably connected to the base; a seat connector configured to connect to a seat; A horizontal synchronous pin shaft is connected between the rear end of the connector and the seesaw; the sinking guide mechanism is arranged between the front end of the seat connector and the base; the sinking guide mechanism includes an obliquely arranged The oblique guide groove on the base and the guide rod arranged on the seat connector and horizontally penetrated in the oblique guide groove; and from front to back, the oblique guide groove is inclined backward and downward; the front end of the seat connector moves synchronously with the seesaw to Make the guide rod slide along the inclined guide groove; in the initial state, the seat connector is in a horizontal state, and the guide rod is located at the front upper end of the inclined guide groove; in the reclined state, the seesaw follows the back of the chair and drives the seat The rear end of the connecting piece moves downwards and backwards; the front end of the seat connecting piece slides backwards and downwards along the inclined guide groove; the whole seat connecting piece sinks relative to the base and moves backward; the seat connecting piece moves from the horizontal state to the front height In the low reclining state, the seat base tilts following the seat connecting piece to make the front end of the seat upturned; the sinking height of the front end of the seat connecting piece and the upward tilting height of the seat front end are partially or completely offset.

As a preference, the seat connectors are arranged along the front and back directions, and the seat connectors are mirrored on the left and right sides of the base; In the connecting piece; in the initial state, the seat connecting piece is horizontally located at the upper end of the base. The front ends of the two seat connectors are kept moving synchronously through the guide rod, so as to ensure the synchronization of the two seat connectors.

Preferably, the inclined guide groove is configured such that the sinking distance of the front end of the seat connector is smaller than the sinking distance of the rear end of the seat connector. When reclining, the seat surface can be tilted forward and backward to match the reclining of the chair.

Preferably, along the front-rear direction, the inclination angle of the oblique guide groove relative to the horizontal is between 20° and 30°. The inclination angle between the inclined guide groove and the horizontal is small, so that when the seat is leaned back, the seat connector can drive the seat back for a sufficient distance, avoiding a large gap between the seat and the back of the chair and causing the user's waist to lose support; at the same time, it can Limit the sinking distance of the front end of the seat connector.

Preferably, in the reclined state, the inclination angle between the upper end surface of the seat connecting member and the horizontal is between 5° and 10°. Avoid the large inclination angle of the seat connecting piece, which will cause the front end of the seat seat to rise excessively.

Preferably, in the reclined state, the lift distance of the front end of the seat is no more than 15mm compared to the initial state. This makes the height of the front end of the seat basically unchanged, without affecting the user experience.

Preferably, an elastic return mechanism is provided in the base, and the elastic return mechanism includes a return spring arranged along the front and rear directions; the return spring can be elastically deformed in response to the backward movement of the seesaw to provide the return of the seesaw by rotation and reset. elastic. The return spring can act on the rocker so that the user can return to get up after leaning back.

As a preference, the front part of the base is also provided with a preload adjustment assembly capable of adjusting the preload of the return spring; the preload adjustment assembly includes a rotating support that is rotatably arranged in the base, and is arranged below the rotating support along the front and rear direction. The drive shaft, the rotating gear sleeve threaded on the drive shaft, the rotating handle that is horizontally penetrated in the base from the outside of the base and cooperates with the rotation of the rotating gear sleeve gear; the front end of the return spring is provided with a front connecting block, the The front connecting block is connected with the rotating support; the rotation of the rotating handle can drive the rotating gear sleeve to rotate to drive the drive shaft to move forward and backward, and the backward movement of the driving shaft can squeeze the rotating support to drive the front connecting block to move forward. Then, the initial tension of the return spring can be adjusted by turning the handle in advance, so that the return spring can match users with different body weights and provide different tilting restoration forces.

Preferably, the rotating support includes two parallel rotating plates that are rotatably matched with the base, and the front connecting block is clip-fitted on the upper ends of the two rotating plates; and an inclined swash plate is connected between the lower ends of the two rotating plates , from front to back, the inclined plate is inclined backward and downward; the drive shaft is arranged under the two rotating plates, and the rear end of the drive shaft is provided with an extrusion bump; the drive shaft moves backward to squeeze the extrusion bump The pressing swash plate makes the rotating plate levered. The slanted plate is pushed by the extruded bump to make the rotating plate levered to pull the return spring. The structural design is labor-saving, so that it does not need to spend a lot of operating force when turning the handle; it makes the adjustment light and labor-saving.

Preferably, the synchronizing pin shaft is a horizontal long axis; the rear end of the return spring is connected with a rear mounting block, and the synchronizing pin shaft is passed through the rear connecting block. The synchronizing pin shaft can directly pull the return spring to elastically deform in the front-rear direction.

Preferably, the seesaw includes support plates respectively located on the left and right sides, and each support plate is provided with a longitudinal sinking groove; the synchronization pin shaft is a horizontal long axis, and the end of the synchronization pin shaft passes through sink and connect with the seat connector. When the human body sits on the seat and does not lean back, the user's center of gravity is located at the rear end of the seat, which can make the rear end of the seat sink along the sinking groove, making the sitting feeling comfortable.

As a preference, when the seat bears the human body and the back of the chair is not reclined, the seat connector drives the synchronization pin to sink along the sinking groove and stretches the return spring; and the sinking distance of the synchronization pin and the stretching degree of the return spring are the same as Human body weight is proportional. Then, after users of different weights sit on the seat, the rear end of the seat can be lowered by a corresponding distance in advance so that the return spring is at different tension levels; so that when the user leans back, the return spring provides a corresponding tilt recovery Force, play a self-supporting weight effect.

Preferably, the seesaw includes support plates located on the left and right sides respectively, the base includes side plates respectively located on the left and right sides; the rear end of the base is clamped between the two support plates; and the front end of the support plate A rotating shaft is pierced between the side plate so that the seesaw can rotate around the rotating shaft relative to the base.

Preferably, a rotation limiting mechanism is provided between the seesaw and the base, and the rotation limiting mechanism includes a transverse limiting pin arranged in the base and an arc-shaped limiting groove mirrored on the two support plates; The limit pin is a long axis, and the two ends of the limit pin pass through the base respectively and are arranged in the limit groove. The limit pin is a long axis, and its two ends are respectively installed in the limit groove, so that the limit effect is better.

As a preference, when the seesaw rotates from the initial state to the backward state, the limit pin moves from the front end of the limit groove to the rear end of the limit groove; The upper end moves to the lower end of the inclined guide groove. Make the structure more stable.

Preferably, the base includes side plates respectively located on the left and right sides, and the oblique guide groove is arranged at the front upper end of each side plate. The front upper end of the side plate is arranged on the oblique guide groove, so that after the seat connector sinks, the seat will not interfere with the base.

The design starting point, concept and beneficial effects of the present invention that have adopted the above-mentioned technical scheme are:

First, the chassis device of the ergonomic chair of the present invention is provided with a sinking guide mechanism between the front end of the seat connector and the base; The groove moves downwards and backwards; thus, in the backward state, the seat connecting piece will sink relative to the base and move backward; and the seat connecting piece will move from the horizontal state to the inclined state of the front high and the rear low; correspondingly , the seat will follow the inclination of the seat connector to make the front end of the seat upturned; and under the action of the guiding sinking mechanism, the front end of the seat connector will sink, and then the sinking height of the front end of the seat connector will be the same as The tilting height of the front end of the seat offsets all or part of it; so that in the reclined state, the seat can follow the recline of the seat and tilt, but at the same time, the height of the front end of the seat basically does not change compared with the initial state , so that the front end of the seat will not press the user's thigh upwards when reclined, and will not affect the user's comfort in use. Secondly, in the reclined state, the seat connector can move backward synchronously to cater to the backward rotation of the rocker, so that the seat can move backward to avoid the distance between the seat and the back of the chair from increasing, so that the user's buttocks can Move backwards with the seat, avoiding the increase of the angle between the human hip and waist, improving the feeling of rubbing the back during the reclining process, and avoiding the feeling of suspension caused by the loss of support of the waist; making the linkage between the back and the seat truly ergonomic The unique linkage effect improves the comfort of the seat.

Secondly, a return spring and a preload adjustment assembly capable of adjusting the preload of the return spring are arranged in the base along the front and rear directions; the return spring can provide the restoring force for the chair back to recline; Users of different weights can pre-adjust the stretching and tension of the return spring; so that the return spring can provide different sizes of reclining force; so that users of different weights can push the back of the seat when using the seat, and it is easier The reply got up. Moreover, the adjustment operation of the pretension force of the return spring is simple and convenient, and only needs to be turned by turning the handle; The return spring is stretched forward; the force transmission effect is good; and the lever of the rotating support is rotated to stretch the return spring, so that the force required to rotate the function turning handle is small, and the adjustment is light.

Furthermore, a longitudinal sinking groove is provided on the support plate, and the two ends of the synchronization pin shaft are respectively pierced in the sinking groove; when the user is not sitting on the seat, the seat connector is in a horizontal state, and the synchronization pin shaft is at the The upper end of the sinking groove; when the seat supports the user and the seat back is not reclined, the user's center of gravity is located at the rear end of the seat, at this time, the seat connecting piece will be driven by the gravity of the user to drive the synchronization pin to sink in the sinking groove , correspondingly, the return spring is stretched accordingly; and users with different weights make the sinking distance of the synchronous horizontal axis different; so that the stretching degree of the return spring matches the gravity of the user; then users with different weights sit on the seat Finally, the rear end of the seat can be pre-sinked by a corresponding distance so that the return spring is in different stretches; so that when it is reclined later, the return spring provides the corresponding reclining force to achieve a self-supporting effect that can match the user's gravity.

Description of drawings

Fig. 1 is a comparative schematic diagram of the chassis device in an embodiment of the present invention before and after leaning back;

Fig. 2 is a three-dimensional structural schematic diagram of the base, the seesaw and the seat connector in the initial state in the embodiment of the present invention;

Fig. 3 is a schematic diagram of the three-dimensional structure of the base, the seesaw and the seat connector in the backward state in the embodiment of the present invention;

Fig. 4 is a schematic diagram of the three-dimensional structure inside the base in an embodiment of the present invention;

Fig. 5 is a three-dimensional schematic diagram of the cooperation of the base, the seesaw and the seat connector in the embodiment of the present invention;

Fig. 6 is a cross-sectional view of the structure of the chassis device in the initial state in the embodiment of the present invention.

Fig. 7 is a schematic diagram of the structure of the seat connector in the embodiment of the present invention when the synchronization pin shaft moves down along the sinking groove under the action of gravity of the user;

Fig. 8 is a structural schematic diagram of the chassis device during the backward leaning process in the embodiment of the present invention;

Fig. 9 is a structural schematic diagram of the chassis device when the reclining process reaches the maximum range in the embodiment of the present invention;

Fig. 10 is a three-dimensional schematic diagram of the cooperation between the return spring and the base in the embodiment of the present invention;

Fig. 11 is a schematic diagram of the three-dimensional structure of the preload adjustment mechanism in the embodiment of the present invention;

Fig. 12 is a side view of the preload adjustment mechanism in an embodiment of the present invention;

Fig. 13 is a structural schematic diagram of the cooperation of the rotating handle, the rotating gear sleeve and the driving shaft in the embodiment of the present invention;

Fig. 14 is a structural schematic diagram of the cooperation between the rotating tooth sleeve and the drive shaft in the embodiment of the present invention.

The reference signs are: base 1; side plate 1a; seesaw 2; seat connector 3; chair back 4; seat 5; Block 901; Rear connection block 902; Support plate 10; Rotating support 11; Drive shaft 12; External thread 12a; Rotating gear sleeve 13; Internal thread 13a; Rotating handle 14; Swash plate 17; extrusion bump 18; front end plate 19; tooth head 20; first steering tooth 201; annular protrusion 21; second steering tooth 21a; pin 25.

detailed description

In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described here. Therefore, the protection scope of the present invention is not limited by the specific details disclosed below. EXAMPLE LIMITATIONS.

In the description of the present invention, the term "at least one" refers to one or more than one, unless otherwise clearly defined. The terms "first", "second", "third", etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

The specific embodiment of the present invention is as follows:

As shown in Figures 1-14, the present invention provides a chassis device of an ergonomic chair, comprising a base 1, a seesaw 2 and a seat connector 3; the base 1 is used to connect an air rod, and the seesaw 2 is used to connect the seat back 4, and the seesaw 2 is connected to the base 1 in rotation, so that the seat back 4 can tilt and rotate; 2 is connected with a horizontal synchronous pin 6 that makes the two linked, so that the seesaw 2 can act on the rear end of the seat connector 3 to move backward and downward when the seesaw 2 rotates backward. Wherein, a sinking guide mechanism is also provided between the front end of the seat connector 3 and the base 1, and the sinking guide mechanism makes the front end of the seat connector 3 move downward and backward when the seesaw 2 is tilted backward; So that in the reclined state, the seat connecting part 3 will sink and move backward relative to the base 1 as a whole; The front end of the seat 5 will be tilted up following the seat connector 3; and under the action of the guiding sinking mechanism, the front end of the seat connector 3 will sink, and then the sinking height of the seat connector 3 will be the same as that of the seat connector 3. The tilting height of the front end of the seat 5 is completely or partially offset; so that, as shown in FIG. Compared with the initial state, the height of the front end of the seat will basically not change, so that the front end of the seat 5 will not press the user's thigh upwards when reclined, and will not affect the comfort of the user. Secondly, in the reclined state, the seat connector 3 can move backward synchronously to cater to the backward rotation of the seesaw 2, so that the seat 5 can move backward to avoid the increase of the distance between the seat 5 and the seat back 1, This enables the user's buttocks to move backwards with the seat, avoiding the increase in the angle between the human buttocks and the waist, improving the back rubbing feeling during the reclining process, and preventing the waist from losing support and causing a sense of suspension.

Specifically: as shown in Figures 1-9, the seat connector 3 is arranged along the front and rear directions, and the seat connector 3 is mirrored on the left and right sides of the base 1; the base 1 includes The side plate 1a; the sinking guide mechanism includes an oblique guide groove 7 arranged obliquely at the front upper end of each side plate 1a and a guide provided on the seat connector 3 and horizontally penetrated in the oblique guide groove 7 Rod 8; the guide rod 8 is a horizontal metal long axis, the guide rod 8 is simultaneously installed in the inclined guide groove 7 on the two side plates 1a, and the two ends of the guide rod 8 are respectively installed on both sides Then, the front ends of the two seat connectors 3 can keep moving synchronously through the guide rod 8 to ensure the synchronization of the two seat connectors 3 . And from front to back, the oblique guide groove 7 is inclined backward and downward. In the initial state, the seat connector 3 is horizontally located at the upper end of the base 1, and the guide rod 8 is located at the front upper end of the oblique guide groove 7; when the seesaw 2 follows the chair When the back 4 is leaning back, the front end of the seat connector 3 will move backward and downward along the inclined guide groove 7, so that the front end of the seat connector 3 sinks. Further, along the front-to-back direction, the angle of inclination of the oblique guide groove 7 relative to the horizontal is between 20-30°; so that during the movement of the reclining guide rod 8 along the oblique guide groove 7, the seat connector 3 can drive the seat 5. Move back a sufficient distance to avoid a large gap between the seat base 5 and the chair back 4, causing the user's waist to lose support. And the inclined guide groove 7 is configured so that the sinking distance of the front end of the seat connector 3 is smaller than the sinking distance of the rear end of the seat connector 3; The sinking distance is such that when leaning back, the rear end of the seat connector 3 will sink more, so that the seat surface is inclined to match the reclining of the chair back 4; and as shown in Figure 3, in the reclining state, the The inclination angle between the upper end surface of the seat connector 3 and the horizontal is between 5-10°, so as to avoid excessive upward warping of the front end of the seat 5 due to a large inclination angle of the seat connector 3 .

As shown in Figure 4-13, an elastic return mechanism is also provided in the base 1, and the elastic return mechanism includes a return spring 9 arranged in the base 1 along the front and rear directions, and the front and rear ends of the return spring 9 are respectively connected There are front connecting block 901 and rear connecting block 902 of metal structure; the synchronous pin shaft 6 is a horizontal metal long axis, and the seesaw 2 includes support plates 10 respectively located on the left and right sides, and the synchronous pin shaft The two ends of 6 respectively pass through the support plate 2 and are connected with the seat connector 3; the rotation of the seesaw 2 can drive the rear end of the seat connector 3 to move, and the rear ends of the two seat connectors 3 pass through the synchronous pin shaft 6 The synchronous movement is maintained, and the synchronization of the two seat connectors 3 is also ensured. The synchronization pin 6 is installed in the rear connection block 902, so that when the seesaw 2 rotates backwards, the synchronization pin 6 can pull the return spring 9 to elastically deform, so that the return spring 9 provides the force for the return of the seesaw 2 to rotate and reset. Elasticity makes it easy for the user to get back up after leaning back.

As shown in Figures 10-14, a preload adjustment assembly capable of adjusting the preload of the return spring 9 is also provided in the base 1; The rotating support 11 in the base 1, the drive shaft 12 arranged under the rotating support 11 along the front-rear direction, the rotating tooth sleeve 13 threaded on the driving shaft 12, and the rotating handle 14 horizontally penetrating in the base 1; Specifically: a fixed plate 15 parallel to the side plate 1a is provided in the middle of the base 1, and the rotating support 11 is arranged between the fixed plate 15 and the side plate 1a. The rotating support 11 includes two left and right The parallel rotating plate 16 , the fixed plate 15 and the side plate 1 a are respectively rotatably connected with the rotating plate 16 on the corresponding side; so that the rotating support 11 can rotate back and forth relative to the base 1 . The front connecting block 901 is located between the upper ends of the two rotating plates 16, and the front connecting block 901 is engaged with the two rotating plates 16 respectively; then the rotating support 11 can drive the front connecting block when it rotates back and forth relative to the base 1. The block 901 moves back and forth, thereby adjusting the stretching and tension degree of the return spring 9, and the rotating support 11 is also a metal structure, so that the structural strength is stable. Correspondingly, further speaking: the drive shaft 12 is arranged below the two rotating plates 16, and the rear end of the drive shaft 12 is provided with an extruding protrusion 18; at the lower ends of the two rotating plates 16 An inclined swash plate 17 is connected between them. From front to back, the slant plate 17 is inclined toward the rear and downward; The backward movement can push the swash plate 17 to make the rotating support 11 rotate forward so as to stretch the return spring 9 forward. The rotating gear sleeve 13 is threadedly connected to the front end of the drive shaft 12. The rotating gear sleeve 13 is a sleeve structure, and an internal thread 13a is provided in the rotating gear sleeve 13. There is an external thread 12a, so that the rotating tooth sleeve 13 and the drive shaft 12 form a structure similar to that of a screw nut. Moreover, the front end of the base 1 has a front end plate 19 , and the front end portion of the rotating gear sleeve 13 is rotatably installed in the front end plate 19 , so that the rotating gear sleeve 13 can rotate circumferentially on the spot. As shown in Figures 13 and 14, the rotating handle 14 is transversely installed in the base 1 from the outside of the base 1 and engaged with the rotating gear sleeve 13. The rotating handle 14 includes a handle 14a exposed outside the base 1. The handle 14 is located at the end of the base 1 and is provided with a tooth head 20, which is geared with the rotating tooth sleeve 13, specifically refers to: the tooth head 20 has a circle of first steering teeth 20a; At the corresponding position of the sleeve 13, there is also a circle of annular protrusions 21 extending outward in the circumferential direction, and the rear end of the annular protrusions 21 is correspondingly provided with a circle of second steering teeth 21 geared with the first steering ring teeth 20a. Through the cooperation of the first steering gear 20a and the second steering gear 22a, the gear is used for steering, so that the user acts to rotate the handle 14, which can drive the rotating gear sleeve 13 to rotate circumferentially to drive the drive shaft 12 to move forward and backward. And as shown in FIG. 10 , the rotating gear sleeve 13 is limited between the tooth head 20 and the front end plate 19, so that when the handle 14 is turned, the rotating gear sleeve 13 can only rotate circumferentially in situ without displacement; Then, when the rotating gear sleeve 13 rotates, the drive shaft 12 can be driven to move forward and backward, so that the rotation of the rotating support 11 can be further controlled to pull the return spring 9 .

Then, when in the initial state, the user needs to make the return spring 9 pre-tightening force larger, that is, the return spring 9 can provide a larger tilting restoring force; only the rotating handle 14 needs to be rotated to make the drive shaft 12 move backward, and the driving The shaft 12 pushes the swash plate 17 backwards so that the rotating support 11 rotates forward to stretch the return spring 9 forward, so that the initial tension of the return spring 9 is relatively large, and then in the process of reclining, the return spring 9 can provide a greater Anyway, if it is necessary to turn down the pre-tightening force of the back-moving spring 9, turn the handle 14 in the opposite direction and get final product. And as shown in Figure 12, utilize extruding lug 18 to push swash plate 17 to take place leverage and rotate to pull return spring 9, structural design is labor-saving, make need not spend very large operating force when functioning turning handle 14;

As shown in Figure 5-10, the rear end of the base 1 is clamped between the two support plates 10 of the seesaw 2; The board 2 can rotate back and forth relative to the base 1 around the rotation axis 23 . Moreover, a rotation limiting mechanism is provided between the seesaw 2 and the base 1, and the rotation limiting mechanism includes an arc-shaped limiting groove 24 provided on the support plate 10 and a corresponding limiting pin 25 provided on the side plate 1a. ; As shown in FIG. 10 , the limit pin 25 is a long axis, and the two ends of the limit pin 25 are respectively set in the limit grooves 24 on the support plates 10 on both sides; so that the limit effect is better. As shown in Figures 2 and 3, when the rocker 2 rotates from the initial state to the backward state, the limit pin 25 moves from the front end of the limit groove 24 to the rear end of the limit groove 24; correspondingly , the guide rod 8 also moves along the upper end of the inclined guide groove 7 to the lower end of the inclined guide groove 7; so that the structural stability is good.

In addition, a vertical sinking groove 22 is also provided on the supporting plate 10 on each side of the seesaw 2; the two ends of the synchronizing pin shaft 6 respectively pass through the sinking groove 22; and the synchronizing pin shaft 6 can Move up and down in the sinking groove 22; the role played by the sinking groove 22 is: as shown in Figure 6, when the user is not sitting on the seat, the seat connector 3 is in a horizontal state, and the synchronization pin 6 is located at the sinking The upper end of the groove 22; as shown in Figure 7, when the seat 5 carries the user and the seat back 4 is not reclined, the user's center of gravity is located at the rear end of the seat 5, at this time, the seat connector 3 will be affected by the gravity of the user Drive the synchronous pin shaft 6 to sink in the sinker 22, correspondingly, the back-moving spring 9 is correspondingly stretched; And the users of different weights make the sinking distance of the synchronous horizontal shaft 6 different; thus make the stretching degree of the back-moving spring 9 and The user's gravity is matched; then, after users of different weights sit on the seat 5, the rear end of the seat 5 can sink a corresponding distance in advance so that the return spring 9 is in different stretch tensions; The spring 9 provides a corresponding reclining force to achieve a self-supporting weight effect that can match the gravity of the user.

To sum up, the chassis device of the present invention provides a sinking guide mechanism so that when the seesaw 2 is tilted backward, the front end of the seat connector 3 will move downward and backward; thus, in the backward state, the seat connection The whole part 3 will sink relative to the base 1 and move backward; and the seat connecting part 3 will move from a horizontal state to a tilted state where the front is high and the rear is low; and the seat 5 will follow the seat connecting part 3 to tilt so that the seat 5 The front end is upturned and lifted; then the sinking height of the seat connector 3 will be offset in whole or in part with the tilted upward height of the front end of the seat 5; so that as shown in Figure 1, in the reclined state, the chair The seat 5 can be tilted following the reclining of the seat back 4, but at the same time, the height of the front end of the seat 5 basically does not change compared with the initial state; The distance is small, not more than 10mm; so that the front end of the seat 5 will not press the user's thigh upwards when reclined, and will not affect the user's comfort in use. Moreover, in the reclined state, the seat connector 3 can move backward synchronously to cater to the backward rotation of the seesaw 2, so that the seat 5 can move backward to avoid the increase of the distance between the seat 5 and the seat back 1, This enables the user's buttocks to follow the seat and move backwards, eliminating the "back rubbing feeling". Furthermore, through the return spring 9 and the pre-tightening adjustment assembly, the initial pre-tightening force of the return spring 9 (that is, the reclining restoring force after the chair back 4 is reclined) can be adjusted, so that users of different weights can adjust the position after reclining. able to get back up.

Claims (16)

1. A chassis device for an ergonomic chair, characterized in that it comprises: A base configured to connect to an air rod; a seesaw configured to connect to the back of the chair; the seesaw is rotatably connected to the base; The seat connector is configured to connect the seat; a horizontal synchronous pin shaft is connected between the rear end of the seat connector and the seesaw so that the two can be linked; The sinking guide mechanism is arranged between the front end of the seat connector and the base; the sinking guide mechanism includes an oblique guide groove arranged obliquely on the base and a guide rod arranged on the seat connector and horizontally penetrated in the oblique guide groove ; and from front to back, the inclined guide groove is inclined backward and downward; the front end of the seat connector moves synchronously with the seesaw so that the guide rod slides along the inclined guide groove; In the initial state, the seat connector is in a horizontal state, and the guide rod is located at the front upper end of the inclined guide groove; in the reclined state, the seesaw follows the back of the chair and drives the rear end of the seat connector to move downward and backward; The front end of the seat connector slides backwards and downwards along the inclined guide groove; the seat connector as a whole sinks relative to the base and moves backward; the seat connector moves from a horizontal state to an inclined state where the front is high and the rear is low, and the seat follows the seat. The inclination of the connecting piece causes the front end of the seat to be upturned; the sinking height of the front end of the seat connecting piece and the tilting uplifting height of the front end of the seat offset partially or completely. 2. The chassis device of an ergonomic chair according to claim 1, wherein the seat connector is arranged along the front and rear directions, and the mirror image of the seat connector is arranged on the left and right sides of the base; the guide rod is A horizontal long axis, the two ends of the guide rod respectively pass through the seat connectors on both sides; in the initial state, the seat connectors are horizontally located at the upper end of the base. 3 . The chassis device of an ergonomic chair according to claim 1 , wherein the inclined guide groove is configured such that the sinking distance of the front end of the seat connector is smaller than the sinking distance of the rear end of the seat connector. 4 . 4. The chassis device of an ergonomic chair according to claim 1 or 3, characterized in that: along the front-rear direction, the inclination angle of the oblique guide groove relative to the horizontal is between 20° and 30°. 5 . The chassis device of an ergonomic chair according to claim 1 , wherein, in the reclined state, the inclination angle between the upper end surface of the seat connecting member and the horizontal is between 5° and 10°. 6 . The chassis device of an ergonomic chair according to claim 1 , wherein, in the reclined state, the lifting distance of the front end of the chair seat relative to the initial state does not exceed 15 mm. 7 . 7. The chassis device of an ergonomic chair according to claim 1, characterized in that: an elastic return mechanism is provided in the base, and the elastic return mechanism includes a return spring arranged along the front and rear directions; the return spring can In response to the backward movement of the seesaw, elastic deformation occurs correspondingly to provide elastic force for the seesaw to rotate and reset. 8. The chassis device of an ergonomic chair according to claim 7, characterized in that: the front portion of the base is also provided with a preload adjustment assembly capable of adjusting the preload of the return spring; the preload adjustment assembly includes Rotate the rotating support arranged in the base, the drive shaft arranged under the rotating support along the front and rear direction, the rotating gear sleeve threaded on the driving shaft, and the rotating gear sleeve is arranged in the base laterally from the outside of the base and connected with the rotating gear sleeve gear Turning to the matching rotating handle; the front end of the return spring is provided with a front connecting block, which is connected to the rotating support; the rotating handle can drive the rotating gear sleeve to rotate to drive the drive shaft to move forward and backward, and the drive shaft is backward The movement can extrude and act on the rotation of the rotating support to drive the front connecting block to move forward. 9. The chassis device of an ergonomic chair according to claim 8, characterized in that: the rotating support includes two parallel rotating plates that are rotatably matched with the base, and the front rotating block is clamped and fitted between the two rotating plates. the upper end of the plate; and an inclined inclined plate is connected between the lower ends of the two rotating plates. From front to back, the inclined plate is inclined to the rear and downward; An extruding lug is provided; the driving shaft moves backward so that the extruding lug extrudes the swash plate to cause the rotating plate to rotate with leverage. 10. The chassis device of an ergonomic chair according to claim 7, characterized in that: the synchronous pin shaft is a horizontal long axis; the rear end of the return spring is connected with a rear mounting block, and the synchronous pin shaft It is installed in the rear connection block. 11. The chassis device of an ergonomic chair according to claim 10, characterized in that: the rocker includes support plates respectively located on the left and right sides, each support plate is provided with a longitudinal sinking groove; The synchronous pin shaft is a horizontal long axis, and the end of the synchronous pin shaft passes through the sinking groove and is connected with the seat connector. 12. The chassis device of an ergonomic chair according to claim 11, characterized in that: when the seat supports the human body and the seat back is not reclined, the seat connector drives the synchronous pin to sink and stretch along the sinker return spring; and the sinking distance of the synchronous pin shaft and the stretching degree of the return spring are directly proportional to the body weight. 13. The chassis device of an ergonomic chair according to claim 1, wherein the seesaw includes support plates respectively located on the left and right sides, and the base includes side plates respectively located on the left and right sides; The rear end of the base is clamped between two support plates; and a rotating shaft is pierced between the front end of the supporting plate and the side plate so that the seesaw can rotate relative to the base around the rotating shaft. 14. The chassis device of an ergonomic chair according to claim 13, characterized in that: a rotation limiting mechanism is provided between the seesaw and the base, and the rotation limiting mechanism includes a transverse limiter arranged in the base. The spacer pin and the arc-shaped spacer slots mirrored on the two supporting plates; the spacer pin is a long axis, and the two ends of the spacer pin pass through the base respectively and are arranged in the spacer slot. 15. The chassis device of an ergonomic chair according to claim 14, characterized in that: when the seesaw rotates from the initial state to the reclined state, the limit pin moves from the front end of the limit groove to The rear end of the limit groove; correspondingly, the guide rod also moves along the upper end of the inclined guide groove to the lower end of the inclined guide groove. 16 . The chassis device of an ergonomic chair according to claim 1 , wherein the base includes side panels located on the left and right sides respectively, and the oblique guide groove is arranged at the front upper end of each side panel.

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