WO2015043474A1

WO2015043474A1 - Support frame driving mechanism for swivel chair chassis

Info

Publication number: WO2015043474A1
Application number: PCT/CN2014/087322
Authority: WO
Inventors: 何基; 阮正富
Original assignee: 浙江永艺家具股份有限公司
Priority date: 2013-09-24
Filing date: 2014-09-24
Publication date: 2015-04-02
Also published as: CN103504845A; CN103504845B

Abstract

A bracket driving mechanism for a swivel chair chassis, comprising a chassis (1), a support frame (2) and a warping plate (3); the support frame (2) and the inclined plate (3) are both arranged inside the chassis (1); the middle portion of the inclined plate (3) is hinged to the chassis (1) via a first pin (11); the front portion of the inclined plate (3) is provided with a first connecting rod (13) and a second connecting rod (14); one end of the first connecting rod (13) is hinged to the front end of the inclined plate (3), and the other end of the first connecting rod (13) is hinged to one end of the second connecting rod (14) via a third pin (15), the third pin (15) being connected to the support frame (2); and the other end of the second connecting rod (14) is hinged to the chassis (1) via a second pin (12); track grooves (17) fitted with the first pin (11) and used to guide the movement path of the support frame (2) are symmetrically arranged at two sides of the support frame (2); the first pin (11) passes through the track grooves (17); and the inclined plate (3) rotates and drives the support frame (2) to move along the path of the track grooves (17) via the first connecting rod (13) and the second connecting rod (14). The support frame driving mechanism enables the tilt back and restoring force of a chair back (37) to be correspondingly matched with the weight of a human body, such that a person of either light or heavy weight can easily tilt back and restore to get up.

Description

Bracket driving mechanism for swivel chair chassis

Technical field

The invention relates to the technical field of a swivel chair and an office chair, in particular to a bracket driving mechanism for a swivel chair chassis.

Background technique

The swivel chair chassis, also known as the swivel chair tray, is an important part under the swivel seat cushion. The lifting of the seat cushion and the tilting angle adjustment of the backrest are all done by the chassis.

The current swivel chair tray is generally composed of upper tray, lower joist, rotating shaft and spring device. After the upper dial and the swivel seat are fixed on the back, the swivel chair can be tilted around the rotating shaft and can actively respond to the user. Have a sense of comfort. For example, the Chinese patent discloses a tray (patent number: 02287885.8), which mainly comprises a bottom plate, a movable seat, a conical tube and an adjusting device. The movable seat is movably connected to the bottom plate, and a conical tube connecting the gas bar in the middle of the movable seat is connected. The cone fixing plate and the conical tube are welded together on the movable seat; the adjusting device comprises an adjusting rod, an adjusting plate, a torsion spring a, a torsion spring a fixing plate, the adjusting rod is inserted in the movable seat, the adjusting plate The fixed connection is connected to one end of the adjusting rod inserted into the movable seat, one side of the adjusting plate contacts the gas pressure bar, the other side is connected with the torsion spring a; and the other side of the adjusting plate is provided with an adjusting plate stopping piece.

The adjustment device of the above-mentioned swivel chair tray is completely adjusted by the torsion spring. For people of different weights, the force of the torsion spring required is different, so that the product does not have good versatility. In response to this problem, the Chinese patent of the "201020264417.6" patent discloses a rolling shaft adjustment swivel chair tray which utilizes the gravity transmitted on the seat surface to transmit the restoring force of the backrest, and can basically achieve the use of people who meet different body weights without Adjustment. However, when leaning back on the seat on which the tray is mounted, since the gravity of the human body is supported by the backrest and the specific gravity is gradually increased, the gravity applied to the seat surface is gradually reduced, and the restoring force transmitted by gravity to the backrest is changed. Small, resulting in insufficient backrest recovery force at the maximum tilt angle, the restoring force is too dependent on the elastic return of the elastic reset device, so the limited range of people is suitable, the person with light weight is difficult to lean, and the person with heavier weight is difficult to get back after leaning back. , can not achieve the most reasonable match recovery.

The problem with the above chassis is that during the backward tilting of the human body, under the same seat gravity loading condition, the restoring torque of the chassis is gradually reduced or remains unchanged, and is applied to the seat back during the tilting process. The pressure becomes larger, the driving force becomes larger, the recovery force is insufficient to counteract the driving force, and the restoring force is too dependent on the elastic recovery of the elastic reset device, so the applicable crowd is limited, and the person with a light weight is difficult to lean, and the weight is heavier. It is difficult for people to get up after they have fallen.

Therefore, it is necessary to design a swivel chair chassis with a small restoring force to the elastic restoring force of the elastic resetting device, so that it can be applied to a wider range of people, so that people who are lighter or heavier can easily lean back and get up. . Such a chassis general frame includes a base for connecting the air rod, a bracket for fixing the seat, and a rocker for connecting the back of the seat, and the bracket is driven by the rocker to reset the bracket, the bracket or the tilt The board is connected with an elastic reset device. In such a chassis, the drive mechanism of the bracket is the design focus, which is the key to solving the above problems.

Technical solution

The present invention overcomes the deficiencies in the prior art described above, and provides a bracket driving mechanism that can provide a reasonable restoring force during the movement of the bracket; thereby loading the seat back on the seat during the tilting process. The ratio of gravity transmission to the backrest restoring force is gradually increased, and a reasonable backrest restoring force is always provided throughout the process, so that people who are lighter or heavier can easily lean back and return to get up.

The technical solution of the present invention is implemented as follows:

A bracket driving mechanism for a swivel chair chassis includes a base for connecting a gas rod, a bracket for fixing the seat, and a rocker for connecting the back of the chair, wherein the bracket and the rocker are disposed in the base. The middle part of the rocker is hinged to the base through the first pin shaft, and the front part of the rocker is provided with a first link and a second link, one end of the first link is hinged with the front end of the rocker, and the other end of the first link is One end of the two links is hinged through the third pin shaft and the third pin shaft is connected to the bracket, and the other end of the second link is hinged to the base through the second pin shaft, and the first pin is symmetrically opened on both sides of the bracket The shaft is matched with a track groove for guiding the movement track of the bracket. The first pin shaft is disposed in the track groove, and the rocker rotates through the first and second links to drive the carriage to move along the track of the track groove.

The second pin has two forms that do not interfere with the movement of the carriage. Preferably, the second pin is coupled to the base after passing or avoiding the bracket.

Preferably, a hollow groove that cooperates with the second pin shaft to avoid the second pin shaft during the movement of the bracket is symmetrically disposed on both sides of the bracket, and the second pin shaft is disposed in the hollow groove. Hollow slots are formed on both sides of the bracket so that the bracket is not obstructed by the second pin when it is moving.

Preferably, the portion of the bracket that interferes with the second pin shaft is cut away such that the bracket avoids the second pin.

Preferably, the first pin shaft is a long axis, and both ends of the first pin shaft are respectively connected to the base after passing through the rocker and the track groove. This ensures that it provides sufficient strength to allow the rocker to rotate freely.

Preferably, the first pin shaft is two independent short shafts, and two brackets are fixedly arranged on the base, and one end of each short shaft passes through the rocker and the track slot in turn, and is connected to the base, and each The other end of the stub shaft is inserted into the corresponding bracket. With such a structure, the interior of the base is more compact, and the first pin shaft is supported by the bracket to meet the strength requirement.

Preferably, the second pin shaft is an entire long shaft, and both ends of the second pin shaft are sequentially connected to the base through the second connecting rod and the hollow groove. This also ensures that it provides sufficient strength to allow the second link to rotate freely.

a portion of the bracket that interferes with the second pin shaft is cut away so that the bracket avoids the connection between the second pin shaft and the second pin shaft and the base. Under such conditions, preferably, the second The pin shaft is an entire long shaft, and both ends of the second pin shaft are respectively inserted into the second shaft hole through the second link.

Preferably, the second pin shaft is two independent small shafts, and two supports are fixedly fixed on the base, and one end of each small shaft passes through the second connecting rod and the hollow slot in sequence, and is connected to the base. The other end of each small shaft is inserted into the corresponding support. The use of such a structure makes the interior of the base more compact, and can avoid the elastic reset device from being obstructed, and the second pin shaft is supported by the support to meet the strength requirement.

a portion of the bracket that interferes with the second pin shaft is cut away so that the bracket avoids the connection between the second pin shaft and the second pin shaft and the base. Under such conditions, preferably, the second The pin shaft is two independent small shafts, and two supports are fixedly arranged on the base. One end of each small shaft passes through the second link and is connected with the base, and the other end of each small shaft is inserted in the corresponding Inside the support.

Preferably, the connection of the first pin shaft to the base means that the first shaft hole is symmetrically disposed on both sides of the rear end of the base, and the first pin shaft is inserted in the first shaft hole.

Preferably, the connection of the second pin shaft to the base means that the second shaft hole is symmetrically disposed on both sides of the front end of the base, and the second pin shaft is inserted into the second shaft hole.

Preferably, the attachment of the third pin to the bracket means that the third pin is inserted into the bracket. The third pin can drive the carriage to move synchronously.

Preferably, the base comprises a bottom plate for connecting the gas rods, and a support plate is respectively arranged in a vertical direction on the left and right sides of the bottom plate, and the support plate is fixedly connected with the bottom plate, and the first pin shaft and the second pin shaft are The support plate of the base is connected; the bracket comprises two substrates arranged in parallel and arranged in a vertical direction, the substrate is attached to the support plate, and the upper end of the substrate is bent to form a support plate for connecting the seat, in two substrates A connecting plate is fixedly connected between the two substrates. The base encloses the bracket therein, the structure is reasonable, and the overall appearance is more beautiful.

Preferably, the first link from bottom to top is disposed obliquely toward the rocker, and the second link from the bottom to the top is inclined toward the direction away from the rocker, in the bracket During the movement, the angle between the second link and the vertical line does not exceed 90 degrees. During the backward tilting of the human body, the back of the human body applies a driving force to the backrest connected to the rocker, and the rocker rotates to move the connecting rod, so that the angle between the second connecting rod and the vertical line gradually increases. The angle between the two links and the horizontal line is gradually reduced, and the component of the rotational force applied by the bracket to the second link is increased, thereby realizing the gradual increase of the restoring moment of the rocker and the link mechanism by gravity loading, and As the driving force of the backrest is gradually increased, the restoring force is less dependent on the elastic restoring force of the elastic resetting device, and is suitable for the needs of different fat and thin people.

In order to allow the carriage to always move in the obliquely upward direction, preferably, the track grooves and the hollow grooves described above from the bottom are inclined toward the direction of the rocker.

A bracket driving mechanism for a swivel chair chassis includes a base for connecting a gas rod, a bracket for fixing the seat, and a rocker for connecting the back of the chair, wherein the bracket and the rocker are disposed in the base. The middle part of the rocker is hinged to the base through the first pin shaft, and the front part of the rocker is provided with a first link and a second link, one end of the first link is hinged with the front end of the rocker, and the other end of the first link is One end of the two links is hinged through the third pin shaft and the third pin shaft is connected to the bracket, and the other end of the second link is hinged to the base through the second pin shaft, and is symmetrically opened on both sides of the bracket for guiding the bracket The track groove of the movement track is provided with a guide shaft matched with the track groove on the base, the guide shaft is inserted in the track groove, and the rocker rotates through the first and second links to drive the track along the track groove motion. In this manner, the first pin and the second pin do not guide the movement track of the bracket, but the guide shaft additionally provided on the base cooperates with the track groove on the bracket, so that the bracket can Movement along the track of the track groove.

Preferably, the first pin is connected to the base after passing through or avoiding the bracket, and likewise, the second pin is connected to the base after passing through or avoiding the bracket. Thus, neither the first pin nor the second pin interferes with the movement of the bracket.

Preferably, the first pin passes through the bracket, and the first pin is symmetrically opened on both sides of the bracket, and the first pin is engaged with the first pin to avoid the first pin when the bracket moves. The shaft is disposed in the hollow slot; the first pin avoiding the bracket means that the portion of the bracket that interferes with the first pin shaft is cut off so that the bracket avoids the first pin shaft.

Preferably, the second pin passing through the bracket means that the hollow pin 2 for engaging the second pin shaft during the movement of the bracket is symmetrically opened on both sides of the bracket, and the second pin is The shaft is disposed in the hollow groove 2; the second pin avoiding the bracket means that the portion of the bracket that interferes with the second pin shaft is cut off so that the bracket avoids the second pin.

Beneficial effect

The bracket driving mechanism of the present invention can match the reclining restoring force of the seat back according to the weight of the human body, so that people who are light or heavy can easily recline and get up.

Specifically, the pin shaft, the rocker, the first link and the second link of each hinge point of the present invention form a four-point linkage mechanism to form a force transmission, and the seat back connection is fixed to the rocker as a four-point linkage mechanism. The driving force of the human body is applied to the seat by the third pin shaft hinged to the bracket to form a restoring force applied to the four-point link mechanism, and the driving force and the restoring force of the four-point link mechanism form a confrontational relationship.

During the backward tilting of the human body, the angle between the second link of the four-point linkage mechanism of the present invention and the horizontal line is gradually reduced, and the rotational force component of the bracket applied to the second link is increased, thereby realizing Gravity loading gradually increases the restoring moment of the four-bar linkage mechanism, and is opposed to the gradually increasing driving force. The restoring force is less dependent on the elastic restoring force of the elastic resetting device, and the applicable population is wider, the weight is lighter or Heavy people can easily lean back and get up.

Furthermore, the seat equipped with the bracket driving mechanism and the chassis of the present invention, in the process of leaning back, the seat also moves backwards following the rotation of the seat back, so that the back waist support always fits the back of the human body. Corresponding position, avoiding the back waist support from the waist of the human body to produce a waist suspension, and also avoiding friction between the clothes and the seat back.

DRAWINGS

1 is a schematic perspective structural view of a chassis of the present invention in Embodiment 1;

Figure 2 is a perspective view showing the perspective of another embodiment of the chassis of the present invention in Embodiment 1;

Figure 3 is a schematic view showing the rocker and the bracket in the initial state in the first embodiment;

4 is a schematic view showing the rocker and the bracket in the up state in the first embodiment;

Figure 5 is a schematic view showing the disassembled structure of the bracket and the base in the first embodiment;

6 is a schematic view showing the split structure of the bracket and the base at another angle in the embodiment 1;

7 is a schematic perspective structural view of a chassis in Embodiment 2;

Figure 8 is a schematic view showing the disassembled structure of the bracket and the base in the second embodiment;

Figure 9 is a schematic view of a person sitting on a swivel chair in an unsinkable state;

Figure 10 is a schematic view showing a state in which a person sits on a swivel chair and leans back;

Figure 11 is a perspective view showing the structure of the chassis of Embodiment 3;

Figure 12 is a schematic view showing the disassembled structure of the chassis in the third embodiment.

Embodiments of the invention

Specific embodiments of the invention are as follows:

Embodiment 1: Firstly, the reference orientation of each component of the present invention is defined. When the chassis and the swivel chair are normally installed, the front of the swivel chair is the front end, and the rear of the swivel chair includes the backrest at the rear end, and the front end of the chassis is far away. In the area of the rocker, the rear end of the chassis is the area near the rocker.

A bracket driving mechanism for a swivel chair chassis, as shown in FIGS. 1 to 6, includes a base for connecting a gas rod, a bracket 2 for fixing the seat, and a rocker 3 for connecting the seat back. The frame 2 and the rocker 3 are disposed in the base 1; specifically, the base 1 includes a bottom plate 4 for connecting the gas rods, and a support plate 5 is arranged on each of the left and right sides of the bottom plate 4 in a vertical direction. The plate 5 is fixedly connected to the bottom plate 4, and the bottom plate 4 supports the entire chassis and the seat and the back; the bracket 2 includes two substrates 6 arranged in parallel and arranged in a vertical direction, and the substrate 6 is attached to the support. The upper end of the substrate 6 is bent to form a support plate 7 for connecting the seat, and the connecting plate 8 is fixedly connected between the two substrates 6. The connecting plate 8 can be multiple, and the connecting plate 8 connects the two substrates 6. The connection is fixed, and the rocker 3 is disposed between the two substrates 6.

A first shaft hole 9 and a second shaft hole 10 are symmetrically disposed at a rear end and a front end of the support plate 5 on both sides of the base 1. The first pin 11 is inserted in the middle of the rocker 3 and the rocker 3 is the first pin 11 In order to rotate the fulcrum, the first pin 11 is a long axis, and both ends of the first pin 11 are respectively inserted through the rocker 3 and the bracket 2 and inserted into the first shaft hole 9; The first link 13 and the second link 14 are symmetrically disposed on both sides of the front portion of the plate 3. As shown in FIG. 2, the first link 13 from the bottom to the top is inclined toward the direction of the rocker 3. It is provided that the second link 14 from the bottom to the top is inclined toward the direction away from the rocker 3, and the angle between the second link 14 and the vertical line does not exceed 90 during the movement of the bracket 2 degree.

One end of the first link 13 is hinged to the front end of the rocker 3 through the fourth pin shaft 16, and the other end of the first link 13 is hinged to the end of the second link 14 via the third pin 15 and the third pin 15 is interspersed. In the bracket 2, the other end of the second link 14 is pierced with a second pin 12 and the second pin 12 passes through the bracket 2 and is inserted into the second shaft hole 10, the second pin shaft 12 is a long axis, and both ends of the second pin 12 are sequentially inserted through the second link 14 and the bracket 2, and then inserted into the second shaft hole 10; because the rocker 3 drives the bracket through the connecting rod 2 movement, so that the track 6 corresponding to the first pin 11 for guiding the movement track of the bracket 2 and the second pin 12 are matched symmetrically on the substrate 6 on both sides of the bracket 2 The hollow groove 18 of the second pin shaft 12 is avoided when the bracket 2 is moved. The track groove 17 and the hollow groove 18 are also opened to enable the first pin shaft 11 and the second pin shaft 12 to pass through the bracket 2, from the bottom to the bottom. The track groove 17 and the hollow groove 18 are inclined in the direction of the rocker 3, and the first pin 11 and the second pin 12 are respectively disposed in the track groove 17 and the hollow groove 18, and the track groove 17 is matched with the first pin 11 Used to guide the trajectory of the carrier, the hollow groove 18 only for the second through the bracket pin 12 does not hinder movement of the carriage.

The bracket 2 is connected with an elastic returning device, and the elastic returning device is a spring 19, one end of which is connected to the bracket 2, and the other end of the spring 19 is connected to the base 1. Specifically, a cross bar 20 is disposed on the bracket 2, and both ends of the cross bar 20 are fixedly connected with the two substrates 6 of the bracket 2, the spring 19 is inclined, and the upper end of the spring 19 is hooked to the cross bar 20, the spring The lower end of 19 is hooked to the lower edge of the front end of the base 1. In actual use, 1 to 4 springs 19 can be set according to actual needs.

As shown in FIG. 4, when the rocker 3 is turned backward, no relative displacement occurs between the first pin shaft 11, the second pin shaft 12 and the base, and only the relative movement with the bracket occurs, and the front end of the rocker 3 is dragged upward. The first link 13 moves upward, and the third pin 15 at which the first link 13 and the second link 14 are hinged pulls the bracket 2 to move obliquely upward toward the rocker 3, and the movement track of the bracket 2 is Between the track grooves 17; the angle between the second link 14 and the vertical line does not exceed 90 degrees during the entire movement, and the third pin 15 is always at the vertical line and the second of the first pin 11 Between the vertical lines of the pin 12.

When the seat back or the rocker 3 is tilted to the maximum angle, the distance between the bracket 2 or the seat back movement with the back of the chair is 15 to 40 mm, preferably 30 mm; the angle of the back of the seat back is 10 to 30 Degree, the best is 21 degrees.

As shown in Figures 1, 2, 3, 5, 6, and 9, in the initial state, the person sits on the swivel chair, and under the action of the spring 19 pulling force, the seat 36, and the human gravity, the pallet 7 is pressed against the base 1 On the support plate (not shown), the substrate 6 of the bracket 2 is completely inside the base 1; as shown in Fig. 10, when the person leans back against the seat back 37, as shown in Figs. 1, 2, 3, 5, 6 As shown in FIG. 10, the bracket 2 drives the seat 36 to interlock, so that the seat 36 also moves backwards following the rotation of the seat back 37. In this process, the human body back A and the human hip B are taken as an example. Between the back A of the human body and the back 37, the hips B and the seat 36 are always relatively fixed, and no relative displacement occurs, thereby avoiding friction between the clothes and the back.

Embodiment 2: This embodiment is different from Embodiment 1 in that, as shown in FIGS. 7 and 8, the second pin 12 is two independent small shafts 41, and is fixedly fixed on the base 1. Two pedestals 42, one end of each small shaft 41 passes through the second connecting rod 14 and the hollow groove 18 in turn, and is inserted into the second shaft hole 10, and the other end of each small shaft 41 is inserted into the corresponding bearing. 42 inside. Thus, the spring 19 can be avoided relative to the form of a long axis to prevent the spring 19 from being obstructed.

Embodiment 3: This embodiment is different from Embodiment 1 in that, as shown in FIGS. 11 and 12, the portions of the substrate 6 on both sides of the bracket 2 interfere with the second shaft hole 10 and the second pin shaft 12 are cut off. Thereby, the bracket 2 avoids the second shaft hole 10 and the second pin shaft 12, and the second pin shaft 12 is directly inserted into the second shaft hole 10.

Embodiment 4: The bracket driving mechanism of this embodiment is different from Embodiment 1 in that the first pin shaft does not cooperate with the track groove, but the guide shaft is additionally provided on the base to cooperate with the track groove, specifically The bracket driving mechanism includes a base for connecting the gas rod, a bracket for fixing the seat, and a rocker for connecting the back of the chair. The bracket and the rocker are all disposed in the base, and the middle of the rocker passes through the first The pin shaft is hinged to the base, and the front part of the rocker is provided with a first link and a second link, one end of the first link is hinged with the front end of the rocker, and the other end of the first link and one end of the second link pass The third pin shaft is hinged and the third pin shaft is connected to the bracket, and the other end of the second link is hinged to the base through the second pin shaft, and the track groove for guiding the movement track of the bracket is symmetrically opened on both sides of the bracket The guide shaft is arranged on the base, and the guide shaft is inserted into the track groove, and the rocker rotates through the first and second links to drive the carriage to move along the track of the track groove.

The first pin is connected to the base after passing through or avoiding the bracket. Similarly, the second pin is connected to the base after passing through or avoiding the bracket.

The passage of the first pin through the bracket means that a hollow groove corresponding to the first pin shaft for escaping the first pin shaft during the movement of the bracket is symmetrically opened on both sides of the bracket, and the first pin shaft is disposed In the hollow slot 1; the first pin avoiding the bracket means that the portion of the bracket that interferes with the first pin shaft is cut off so that the bracket avoids the first pin shaft.

The second pin passing through the bracket means that the hollow pin 2 corresponding to the second pin shaft for escaping the second pin shaft during the movement of the bracket is symmetrically opened on both sides of the bracket, and the second pin shaft is disposed In the hollowing groove 2; the second pin avoiding the bracket means that the portion of the bracket that interferes with the second pin shaft is cut off so that the bracket avoids the second pin.

Claims

1, A bracket driving mechanism for a swivel chair chassis, comprising: a base for connecting a gas rod, a bracket for fixing the seat, and a rocker for connecting the back, the bracket and the rocker are all set In the base, the middle portion of the rocker is hinged to the base through the first pin shaft, and the front portion of the rocker is provided with a first connecting rod and a second connecting rod, and one end of the first connecting rod is hinged with the front end of the rocking plate, and the first connecting rod is The other end is hinged to the second pin by a third pin and the third pin is connected to the bracket, and the other end of the second link is hinged to the base by the second pin, and is symmetrically opened on both sides of the bracket. a track groove for guiding the movement track of the bracket, the first pin shaft is disposed in the track groove, and the rocker rotates through the first and second links to drive the carriage along the track of the track groove .

2, A carriage driving mechanism for a swivel chair chassis according to claim 1, wherein the second pin shaft is connected to the base after passing through or avoiding the bracket.

3, A bracket driving mechanism for a swivel chair chassis according to claim 2, wherein symmetrical engagement with the second pin shaft on both sides of the bracket is used to avoid the second pin when the bracket is moved The hollow groove of the shaft and the second pin shaft are bored in the hollow groove.

4, A carriage driving mechanism for a swivel chair chassis according to claim 2, wherein a portion of the bracket that interferes with the second pin shaft is cut away so that the bracket avoids the second pin shaft.

5, The bracket driving mechanism for a swivel chair chassis according to claim 1, wherein the first pin shaft is a long axis, and both ends of the first pin shaft pass through the rocker in turn. The track slot is connected to the base.

6, The bracket driving mechanism for a swivel chair chassis according to claim 1, wherein the first pin shaft is two independent short shafts, and two brackets are fixedly arranged on the base. One end of each short shaft passes through the rocker and the track groove in turn and is connected to the base, and the other end of each short shaft is inserted into the corresponding bracket.

7, A bracket driving mechanism for a swivel chair chassis according to claim 3, wherein said second pin shaft is a long axis, and both ends of the second pin shaft pass through the second one in turn. The connecting rod and the hollow groove are connected to the base.

8, A bracket driving mechanism for a swivel chair chassis according to claim 4, wherein said second pin shaft is a long long shaft, and both ends of the second pin shaft pass through the second joint The rod is inserted behind the second shaft hole.

9, The bracket driving mechanism for a swivel chair chassis according to claim 3, wherein the second pin shaft is two independent small shafts, and two supports are fixedly fixed on the base. One end of each small shaft passes through the second connecting rod and the hollow groove in turn, and is connected to the base, and the other end of each small shaft is inserted into the corresponding support.

10. The bracket driving mechanism for a swivel chair chassis according to claim 4, wherein the second pin shaft is two independent small shafts, and two supports are fixedly fixed on the base. One end of each small shaft passes through the second link and is connected to the base, and the other end of each small shaft is inserted into the corresponding support.

11, A bracket driving mechanism for a swivel chair chassis according to claim 1 or 5 or 6, wherein the first pin shaft is connected to the base means that the first shaft hole is symmetrically disposed on both sides of the rear end of the base. The first pin is inserted into the first shaft hole.

12. A bracket driving mechanism for a swivel chair chassis according to claim 1 or 2 or 3 or 4 or 7 or 8 or 9 or 10, wherein the second pin shaft is coupled to the base means: at the front end of the base The two sides are symmetrically disposed with a second shaft hole, and the second pin shaft is inserted into the second shaft hole.

13, A carriage driving mechanism for a swivel chair chassis according to claim 1, wherein the third pin shaft is coupled to the bracket means that the third pin shaft is inserted into the bracket.

14, The bracket driving mechanism for a swivel chair chassis according to claim 1, wherein the base comprises a bottom plate for connecting the air rod, and each of the left and right sides of the bottom plate is provided with a support in a vertical direction. a plate, the support plate is fixedly connected to the bottom plate, the first pin shaft and the second pin shaft are connected to the support plate of the base; the bracket comprises two substrates arranged in parallel and arranged in a vertical direction, and the substrate is attached to the support plate And the upper end of the substrate is bent to form a bracket for connecting the seat, and a connecting plate is fixedly connected between the two substrates, and the rocker is disposed between the two substrates.

15, A bracket driving mechanism for a swivel chair chassis according to claim 1, wherein the first link from the bottom to the top is inclined toward the direction of the rocker, from bottom to top The second link is disposed obliquely away from the rocker. During the movement of the bracket, the angle between the second link and the vertical line does not exceed 90 degrees.

16, A carriage driving mechanism for a swivel chair chassis according to claim 3, wherein the track groove and the hollow groove described from the bottom to the top are inclined toward the rocker.

17, A bracket driving mechanism for a swivel chair chassis, comprising: a base for connecting a gas rod, a bracket for fixing the seat, and a rocker for connecting the back, the bracket and the rocker are all set In the base, the middle portion of the rocker is hinged to the base through the first pin shaft, and the front portion of the rocker is provided with a first connecting rod and a second connecting rod, and one end of the first connecting rod is hinged with the front end of the rocking plate, and the first connecting rod is The other end is hinged to the second pin by a third pin and the third pin is connected to the bracket, and the other end of the second link is hinged to the base by the second pin, and is symmetrically opened on both sides of the bracket. a guide groove for guiding the movement track of the bracket, a guide shaft matched with the track groove is arranged on the base, the guide shaft is inserted in the track groove, and the rocker rotates through the first and second links to drive the bracket along the edge Track movement of the track groove.

18. A bracket driving mechanism for a swivel chair chassis according to claim 17, wherein the first pin shaft is connected to the base after passing through or avoiding the bracket, and likewise, the second pin shaft passes through or avoids The rear of the bracket is connected to the base.

19. A bracket driving mechanism for a swivel chair chassis according to claim 18, wherein the first pin passing through the bracket means that the first pin shaft is symmetrically opened on both sides of the bracket. The first pin shaft is disposed in the hollow slot 1 when the bracket is moved to avoid the first pin shaft; the first pin shaft avoids the bracket means: interference on both sides of the bracket to the first pin The portion of the shaft is cut away such that the bracket avoids the first pin.

20. A bracket driving mechanism for a swivel chair chassis according to claim 18, wherein the second pin passing through the bracket means that the second pin shaft is symmetrically opened on both sides of the bracket. The second pin shaft is disposed in the hollow slot 2 when the bracket moves to avoid the second pin shaft; the second pin shaft avoids the bracket means: interference on both sides of the bracket to the second pin The portion of the shaft is cut away such that the bracket avoids the second pin.