CN106551542B

CN106551542B - Swivel chair chassis

Info

Publication number: CN106551542B
Application number: CN201510650728.3A
Authority: CN
Inventors: 叶金
Original assignee: UE Furniture Co Ltd
Current assignee: UE Furniture Co Ltd
Priority date: 2015-09-27
Filing date: 2015-09-27
Publication date: 2023-07-25
Anticipated expiration: 2035-09-27
Also published as: CN106551542A

Abstract

The utility model discloses a swivel chair chassis, which comprises a base, a bracket, a swinging block, a horizontally arranged adjusting screw rod and a rotating shaft, wherein the bracket is connected with the base through the horizontally arranged rotating shaft, one end of the adjusting screw rod is inserted into the base, the other end of the adjusting screw rod is exposed out of the base, a spring is sleeved on the part of the adjusting screw rod exposed out of the base, and a nut for adjusting the deformation degree of the spring is in threaded fit with the threaded section of the adjusting screw rod exposed out of the base; the swinging block is arranged in the base, the middle part of the swinging block is hinged with the base, one end of the swinging block is hinged with the end of the adjusting screw inserted into the base, and the other end of the swinging block is in contact fit with the corresponding part of the bracket when the bracket rotates so as to enable the swinging block to swing, and then the adjusting screw is pulled to move so as to enable the spring to deform to form the restoring force of the bracket. The swivel chair chassis changes the vertical installation of the springs into the transverse installation, so that the swivel chair chassis is more attractive in whole, does not need to be bent to squat down, and is more convenient to adjust.

Description

Swivel chair chassis

Technical Field

The utility model relates to the technical field of swivel chairs and office chairs, in particular to a swivel chair chassis.

Background

The swivel chair chassis, also called swivel chair tray, is an important part arranged below the swivel chair seat cushion, and the lifting of the seat cushion and the adjustment of the tilting angle of the backrest are all completed by the chassis.

For example, chinese patent (bulletin number: CN 2922618) discloses a: the chair chassis consists of an upper disc, a middle disc and a knob, wherein the knob is fixed on the upper disc through a carriage screw, and a dust cover, a washer and a spring are arranged on the middle disc; when the chair is tilted, the spring plays a reset role on the tilting of the chair, and according to the patent, the knob, the spring and the carriage screw are basically vertically or almost vertically arranged on the chassis, namely, the included angles formed by the axes of the knob, the spring and the carriage screw and the middle plate or the chair seat are 70-90 degrees, if the elastic force of the spring is required to be adjusted to adjust the reset force of the spring on the tilting of the chair, the user needs to squat down or bend over to adjust the up-down position of the knob on the carriage screw by rotating the knob, so that the compression degree of the spring is adjusted to adjust the reset force of the spring on the tilting of the chair, the operation is inconvenient, the operation is relatively laborious, and especially for females, the bending adjustment posture is unsightly, and in many cases, the user cannot go to adjust the knob due to the defects, so that the waste of the functions is directly caused.

The bulletin number is: the Chinese patent of CN102090805 is improved, and provides a seat chassis with adjustable tilting force, which comprises a middle disc and a large disc, wherein the rear part of the large disc can swing downwards relative to the middle disc around a rotating shaft, a knob is arranged below the front part of the middle disc, the knob is provided with a cavity, a mounting plate fixed with the knob is arranged in the cavity of the knob, a worm wheel is arranged at a position, corresponding to the lower part of the mounting plate, of the knob, and the worm wheel can rotate relative to the knob around the axis of the worm wheel; the key points of the utility model are as follows: the screw is arranged beside the corresponding worm wheel in the knob and meshed with the worm wheel, one end of the handle stretches into the knob from outside to be in transmission connection with the worm, the adjusting bolt sequentially penetrates through the big disc, the middle disc and the mounting plate in the knob from top to bottom and then is matched with the screw thread between the worm wheel, the adjusting bolt is coaxial with the worm wheel, and the adjusting bolt is sleeved with a spiral spring corresponding to the position below the middle disc and above the mounting plate.

Through such improvement, need not to bend over, only need reach the hand and rotate the handle and can upwards or move down through worm gear adjusting bolt to adjust coil spring's compression degree. Also, the bulletin number is: "CN201602417", utility model name: the utility model patent of the worm gear and worm adjusting swivel chair tray is similarly improved, and an adjusting hand wheel can be adjusted at the side edge of the seat without squatting or bending over by a user.

The fundamental problem that has not yet been solved is: the knob, the spring and the adjusting bolt are basically vertically or nearly vertically arranged on the chassis, namely, the included angle formed by the axes of the knob, the spring and the adjusting bolt and the chassis or the chair seat is 70-90 degrees, so that the knob exposed below the chassis can be clearly seen from the front or two sides of the chair, the appearance is very attractive, the grade of the product is reduced to a certain extent, and the requirement of increasingly improving the appearance of the chair by people cannot be met; still further, such structural style shape is irregular, is unfavorable for improving vanning volume, and bellied knob leads to the packing box direct thickening, and in fact case inside has many places to be empty, has wasted case inner space, has increased transportation cost.

Disclosure of Invention

The utility model overcomes the defects in the prior art and provides the swivel chair chassis which not only ensures that the product is concise and beautiful, but also is convenient to adjust the compression degree of the spring and can improve the boxing amount.

The technical scheme of the utility model is realized as follows:

the chassis of the swivel chair comprises a base for connecting an air rod, a bracket for connecting a chair seat, a swinging block and a horizontally arranged adjusting screw rod, wherein the bracket is connected with the base through a horizontally arranged rotating shaft; the swinging block is arranged in the base, the middle part of the swinging block is hinged with the base, one end of the swinging block is hinged with the end of the adjusting screw inserted into the base, and the other end of the swinging block is in contact fit with the corresponding part of the bracket when the bracket rotates so as to enable the swinging block to swing, and then the adjusting screw is pulled to move so as to enable the spring to deform to form the restoring force of the bracket. When a person sits on the swivel chair and leans backwards and enables the bracket to rotate, the swinging block is driven to swing, and then the adjusting screw rod is pulled to move towards the direction of the compression spring, and the elastic force generated by the spring becomes the restoring force of the bracket; the adjusting screw is fixed circumferentially, so that the compression degree of the spring can be adjusted by rotating the nut.

Preferably, a support is fixedly arranged in the base, and the swinging block is hinged with the support through a first pin shaft.

Preferably, the support comprises a pair of support plates which are arranged in parallel at intervals, the upper ends of the support plates are provided with shaft holes matched with the first pin shafts, and the swinging blocks are arranged between the two support plates.

Preferably, the end, inserted into the base, of the adjusting screw is fixedly connected with an adjusting connecting rod, and one end of the swinging block is hinged with the adjusting connecting rod through a second pin shaft. The adjusting connecting rod is a flat plate, is convenient to open holes and is hinged and matched with the swinging block.

Preferably, the adjusting connecting rod is provided with a through hole, and the second pin shaft is inserted in the through hole.

Preferably, the second pin shaft is in clearance fit with the through hole. When the swinging block swings, the adjusting screw rod is pulled obliquely downwards or obliquely upwards at certain angles, so that the adjusting screw rod can move up and down, the horizontal direction of the adjusting connecting rod and the adjusting screw rod is not smooth, the through hole can be designed to be larger than the diameter of the second pin shaft, and the second pin shaft can have a movable gap, so that the adjusting screw rod is prevented from moving up and down as much as possible.

Preferably, an intermediate connecting rod is further arranged between the swinging block and the adjusting connecting rod, one end of the intermediate connecting rod is connected with the adjusting connecting rod through a second pin shaft, and the other end of the intermediate connecting rod is hinged with the adjusting connecting rod through a fourth pin shaft. By the arrangement, when the swinging block swings, the generated oblique pulling force is transferred to the middle connecting rod, and the existence of the middle connecting rod can further correct the up-and-down movement generated by the adjusting connecting rod.

In order to make the force transmission more balanced, preferably, the middle connecting rod comprises two parallel and symmetrically arranged waist-shaped plates, the two waist-shaped plates are fixedly connected through at least one connecting plate, and the adjusting connecting rod is arranged between the two waist-shaped plates.

In order to enhance the firmness of the swinging block and prevent deformation, the swinging block is preferably triangular in shape as a whole.

Preferably, the swinging block comprises two parallel symmetrically arranged triangular plates, the two triangular plates are fixedly connected through at least one connecting plate, two corners of the triangular plates are respectively hinged with the base and the adjusting screw, and the other corner of the triangular plates is in contact fit with the corresponding part of the bracket. The space between the two triangular plates can accommodate the adjusting connecting rod, so that the force transmission is more balanced.

In order to facilitate the matching with the bracket, a third pin shaft is preferably arranged at the other corner of the triangular plate, which is in contact matching with the corresponding part of the bracket.

Preferably, a pressing block is arranged at a corresponding part of the bracket matched with the triangular plate, and a pressing groove matched with the third pin shaft is arranged at the bottom of the pressing block. When the pressing block presses down the swinging block, the third pin shaft is positioned in the pressing groove.

Preferably, the swinging block and the adjusting screw are arranged at the rear part of the base, the pressing block is fixedly arranged at the rear end of the bracket, and the bracket rotates to enable the pressing block to press down the swinging block, so that the adjusting screw is pulled to move towards the direction of the compression spring.

Preferably, two symmetrical shaft seats and a fifth pin shaft which is arranged between the two shaft seats and is used for being in contact fit with the third pin shaft are arranged at corresponding positions of the bracket, which are matched with the triangular plate, the shaft seats are fixedly connected with the bracket, and the fifth pin shaft is positioned above the third pin shaft and is arranged in a crossing way with the third pin shaft. Compared with a pressing block, the structure reduces the die cost, changes the contact form from line contact to point contact, and reduces the friction force during contact.

Preferably, the central axis of the fifth pin is perpendicular to the central axis of the third pin.

Preferably, the third pin shaft and the fifth pin shaft are respectively sleeved with a shaft sleeve, and the shaft sleeves are respectively connected with the third pin shaft and the fifth pin shaft in a rotating way. The shaft sleeve can rotate, so that when the fifth pin shaft is matched with the third pin shaft, the rolling friction force generated between the two shaft sleeves is smaller than the sliding friction force generated by line contact, and the matching between the third pin shaft and the fifth pin shaft can be smoother.

Preferably, the swinging block and the adjusting screw are arranged at the rear part of the base, the shaft seat is fixedly arranged at the rear end of the bracket, and the bracket rotates to enable the fifth pin shaft to press down the swinging block, so that the adjusting screw is pulled to move towards the direction of the compression spring.

Preferably, a lug is arranged at a corresponding part of the bracket matched with the triangle, the lug is hinged with a U-shaped pull ring, and the third pin shaft is arranged in a U-shaped groove of the U-shaped pull ring in a penetrating way. By the arrangement, when the bracket rotates, the swinging block can be lifted upwards to swing.

Preferably, the swinging block and the adjusting screw are arranged at the front part of the base, the lug and the U-shaped pull ring are arranged at the front end of the bracket, and the bracket rotates to enable the U-shaped pull ring to pull the swinging block, so that the adjusting screw is pulled to move towards the direction of the compression spring.

Preferably, two ends of the spring are respectively provided with a spring bracket, and the two ends of the spring are respectively propped against the nut and the side plate of the base through the adjacent spring brackets.

Preferably, the chassis comprises an adjusting handle, the adjusting handle is connected with a sleeve, the sleeve is sleeved outside the spring, and the nut is fixedly arranged at the bottom of the sleeve. The axis of the adjusting handle and the axis of the sleeve are on the same line with the axis of the adjusting screw and the axis of the spring, the adjusting handle is positioned at the side of the chair, and the adjusting handle can be touched by extending hands, so that the compression degree of the adjusting nut and the spring is convenient, and the sleeve wraps the spring to avoid the spring from being exposed outside.

Preferably, the base comprises a bottom plate and side plates vertically arranged on two sides of the bottom plate, wherein one side plate is provided with a through hole for the penetration of the adjusting screw, and the other side plate is correspondingly provided with an opening for the penetration of the adjusting screw into the base. The opening on the other side plate can enable the end part of the adjusting screw rod to penetrate out, so that when the swing amplitude of the swing block is large and the moving stroke of the adjusting screw rod is long, the adjusting screw rod can freely move in the horizontal direction, and the adjusting screw rod is not blocked by the side plate of the base.

The design starting point, the idea and the beneficial effects of the utility model adopting the technical scheme are as follows:

the swivel chair chassis changes the vertical installation of the springs into the transverse installation, and the rotation of the bracket and the force transmission of the adjusting screw are completed through the swinging blocks in the base, so that the swivel chair chassis is ingenious, the transverse installation has the advantages that the axis of the springs and the axis of the adjusting handle are basically on the same line, the swivel chair chassis does not need to be bent down to enable adjustment to be more convenient, and after the swivel chair chassis is installed on a chair seat, the relatively wide chair seat can cover most parts of the springs and the adjusting handle, only one end of the adjusting handle is exposed from the outside in appearance, the overall appearance of the swivel chair is simple and elegant, the function of convenient adjustment is met, and the product grade is improved.

In addition, the tray is transversely arranged, so that the shape is more regular, the space waste can be effectively reduced during boxing and transportation, the boxing amount is increased, and the transportation cost is reduced.

Drawings

Fig. 1 is a schematic perspective view of a chassis in embodiment 1;

FIG. 2 is a schematic plan view of the chassis in embodiment 1;

FIG. 3 is a view from direction A1 of FIG. 2;

FIG. 4 is a view from direction A2 of FIG. 2;

FIG. 5 is a cross-sectional view A-A of FIG. 2;

FIG. 6 is a sectional view B-B of FIG. 2;

FIG. 7 is an exploded view of the chassis of example 1;

FIG. 8 is a schematic view of the structure in which the swing block is directly hinged to the adjusting link in embodiment 1;

fig. 9 is a schematic structural view of the embodiment 1 in which the second pin shaft and the through hole are designed to be in clearance fit when the swinging block is hinged with the adjusting link;

fig. 10 is a schematic structural view of the swing block of embodiment 1 connected to the adjusting link via the intermediate link;

fig. 11 is a schematic perspective view of the chassis in embodiment 2;

fig. 12 is a schematic plan view of the chassis in embodiment 2;

FIG. 13 is a cross-sectional view of C-C of FIG. 12;

FIG. 14 is a cross-sectional F-F view of FIG. 12;

FIG. 15 is an exploded view of the chassis of example 2;

FIG. 16 is a schematic view of the structure in which the swing block is directly hinged to the adjusting link in embodiment 2;

FIG. 17 is a schematic structural view of the swing block of embodiment 2 in which the second pin is designed to be clearance fit with the through hole when the swing block is hinged to the adjusting link;

fig. 18 is a schematic structural view of the swing block of embodiment 2 connected to the adjusting link via the intermediate link;

fig. 19 is a schematic perspective view of the chassis in embodiment 3;

FIG. 20 is a cross-sectional view of the chassis in example 3;

fig. 21 is an enlarged view of a portion a of fig. 20;

fig. 22 is an exploded view of the chassis in example 3.

Detailed Description

The specific embodiments of the present utility model are as follows:

the utility model firstly defines the reference orientation of the main components, when the chassis and the swivel chair are normally installed and used, the front part of the swivel chair is the front end, the rear part of the swivel chair comprises the back at the rear end, the front end of the chassis is a region far away from the back, and the rear end of the chassis is a region close to the back.

Example 1: the embodiment provides a swivel chair chassis, as shown in fig. 1-7, the swivel chair chassis comprises a base 1 for connecting an air rod, a bracket 2 for connecting a chair seat, wherein the bracket 2 is connected with the base 1 through a rotating shaft 3 horizontally arranged, the swivel chair chassis further comprises a swinging block 4 and an adjusting screw 5 horizontally arranged and circumferentially fixed, one end of the adjusting screw 5 is inserted into the base 1, and the other end of the adjusting screw 5 is exposed out of the base 1.

A spring 26 is sleeved on the part of the adjusting screw 5 exposed out of the base 1, and a nut 28 for adjusting the deformation degree of the spring 26 is in threaded fit on a threaded section 27 of the adjusting screw 5 exposed out of the base 1; the deformation degree of the spring mainly refers to the compression degree of the spring, the spring generates elasticity after compression, and the elasticity corresponding to different compression degrees of the spring is also different; the swinging block 4 is arranged in the base 1, the middle part of the swinging block 4 is hinged with the base 1, one end of the swinging block 4 is hinged with the end of the adjusting screw 5 inserted into the base 1, and the other end of the swinging block 4 is in contact fit with the corresponding part of the bracket when the bracket 2 rotates so that the swinging block 4 swings. Since the end of the adjusting screw 5 inserted into the base 1 is restricted by the swinging block 4, it cannot be rotated in the circumferential direction.

Specifically, the base 1 includes a bottom plate 6 and side plates 7a and 7b vertically disposed on two sides of the bottom plate 6, one side plate 7a is provided with a through hole 8 for the penetration of the adjusting screw 5, and in order to avoid interference with the adjusting screw 5 when the moving stroke of the adjusting screw 5 in the horizontal direction is large, the other side plate 7b is correspondingly provided with an opening 9 for the penetration of the adjusting screw 5 into the end of the base.

A spring bracket 29 is arranged at each end of the spring 26, and each end of the spring 26 is abutted against the nut 28 and the side plate 7a of the base through the adjacent spring brackets 29. The swivel chair chassis of the utility model also comprises an adjusting handle 30, the adjusting handle 30 is connected with a sleeve 31, the sleeve 31 is sleeved outside the spring 26, and the nut 28 is fixedly arranged at the bottom of the sleeve 31.

A bracket 10 is fixedly arranged in the base 1, and the swinging block 4 is hinged with the bracket 10 through a first pin shaft 11; specifically, the bracket 10 includes a pair of support plates 12 arranged in parallel at intervals, the support plates 12 are perpendicular to the bottom plate 6 and the side plates 7a and 7b, the upper ends of the support plates 12 are provided with shaft holes 13 matched with the first pin shafts 11, the swinging block 4 is arranged between the two support plates 12, and the part of the adjusting screw 5 inserted into the base 1 is also positioned between the two support plates 12.

In order to make the rotation more free and give consideration to the requirement of firmness, the whole swinging block 4 is triangular; specifically, the swinging block 4 comprises two parallel symmetrically arranged triangular plates 14, the two triangular plates 14 are fixedly connected through at least one connecting plate 15, two corners of the triangular plates 14 are hinged with the bracket 10 and the adjusting screw 5 of the base, and the other corner of the triangular plates 14 is in contact fit with the corresponding part of the bracket.

Specifically, the swinging block 4 is obliquely arranged, the three corners of the triangular plate 14 are respectively provided with pin holes 16a, 16b and 16c, and the first pin shaft 11 sequentially penetrates through the shaft holes 13 of the two support plates 12 and one pin hole 16b in the middle of the two triangular plates 14 to finish the hinging of the swinging block 4 and the bracket 10.

The end of the adjusting screw 5 inserted into the base 1 is fixedly connected with an adjusting connecting rod 17, the adjusting connecting rod 17 is positioned between two triangular plates 14, and one corner below the swinging block 4 is hinged with the adjusting connecting rod 17 through a second pin shaft 18; the adjusting connecting rod 17 is provided with a through hole 19, the second pin shaft 18 is sequentially inserted into a pin hole 16c at one corner of the lower end of the triangular plate 14 and the through hole 19 of the adjusting connecting rod 17, and the hinging of the swinging block 4 and the adjusting connecting rod 17 is completed.

Fig. 8 shows a simplest direct way, namely that the oscillating block 4 is directly hinged with the adjusting link 17 by means of a second pin 18, the diameter of the second pin 18 being equal to the size of the aperture of the through hole 19; however, since the swinging block 4 swings to generate a component force obliquely upward or downward, the adjusting link 17 moves in the horizontal direction and also moves upward or downward. Therefore, as an improvement, as shown in fig. 9, the second pin shaft 18 and the through hole 19 are designed to be in clearance fit, the size of the through hole 19 is larger than the diameter of the second pin shaft 18, and the clearance between the second pin shaft 18 and the through hole 19 can offset the movement stroke of the second pin shaft 18 in the oblique direction, so as to avoid the upward and downward movement of the adjusting connecting rod 17.

As a further improvement, as shown in fig. 5, 7 and 10, an intermediate link 20 is further provided between the swinging block 4 and the adjusting link 17, one end of the intermediate link 20 is connected with the adjusting link 17 through a second pin 18, and the other end of the intermediate link 20 is hinged with the adjusting link 17 through a fourth pin 21. Specifically, the intermediate connecting rod 20 includes two parallel and symmetrically arranged waist-shaped plates 22, the two waist-shaped plates 22 are fixedly connected through at least one connecting plate 15, the adjusting connecting rod 17 is arranged between the two waist-shaped plates 22, and the two waist-shaped plates 22 are positioned between the two triangular plates 14.

The other corner of the triangle 14 is in contact fit with the corresponding part of the bracket, specifically, a third pin 23 is arranged on the other corner of the triangle 14 in contact fit with the corresponding part of the bracket, and the third pin 23 is arranged in the pin hole 16a of the two triangles 14 in a penetrating way. The third pin 23 is closer to the spring 26 than the second pin 18 in the horizontal direction; in this embodiment, the swinging block 4 and the adjusting screw 5 are installed at the rear part of the base 1, i.e. in the direction close to the chair back, a pressing block 24 is arranged at the corresponding part of the bracket 2 matched with the swinging block 4, and a pressing groove 25 matched with the third pin shaft 23 is arranged at the bottom of the pressing block 24; the pressing block 24 is fixedly arranged at the rear end of the bracket 2, and when a person sits on the swivel chair and leans backwards, the rear end of the bracket rotates backwards to enable the pressing block 24 to press down the swinging block 4, namely the third pin shaft 23, so that the adjusting screw 5 is pulled to move towards the direction of the compression spring 26.

After the chassis is arranged on the swivel chair, the nut 28 can be driven to synchronously rotate when the adjusting handle is rotated, and the adjusting screw 5 is fixed in the circumferential direction, so that the initial state of the adjusting screw 5 can not move due to the limitation of the swinging block 4 and the gravity of the bracket and the chair seat, and at the moment, the nut 28 moves horizontally along the axial direction of the adjusting screw 5, the compression degree of the spring can be adjusted, and the aim of adjusting the tilting force of the spring to the chair is fulfilled. During operation, a user does not need to bend over, squat on the ground, and only need to extend hands to one side of the chair to touch the adjusting handle for rotation, so that the operation is very convenient, time-saving and labor-saving; most importantly, the spring is transversely arranged instead of the vertical installation mode, so that most parts of the spring and the handle are covered by the seat, the overall appearance of the chair is simpler, and the product grade is improved.

Example 2: this embodiment differs from embodiment 1 in that: the swinging block 4 and the adjusting screw 5 are arranged at the front part of the base 1, a lug 32 is arranged at a corresponding part of the bracket 2 matched with a triangular plate of the swinging block, the lug 32 is hinged with a U-shaped pull ring 33 through a fifth pin shaft 34, a third pin shaft 23 is arranged in a U-shaped groove 35 of the U-shaped pull ring 33 in a penetrating way, and the lug 32 and the U-shaped pull ring 33 are arranged at the front end of the bracket 2; when a person sits on the swivel chair and leans backwards, the front end of the bracket 2 rotates upwards, so that the U-shaped pull ring 33 is driven to lift the third pin shaft 23 upwards, and meanwhile the swinging block 4 swings, so that the adjusting screw 5 is pulled to move towards the direction of the compression spring.

In this embodiment, as shown in fig. 13 and 16 to 18, the swinging block 4 is reversely installed, that is, the third pin 23 is further away from the spring 26 than the second pin 18 in the horizontal direction, so that when the front end of the bracket 2 rotates upward to lift the third pin 23, the adjusting screw 5 can be pulled to move toward the compression spring 26 as it is.

As in embodiment 1, as shown in fig. 16 to 18, the swinging block 4 is directly hinged with the adjusting link 17 through the second pin 18; or the second pin 18 and the through hole 19 are designed to be in clearance fit; still alternatively, an intermediate link 20 is further provided between the swinging block 4 and the adjusting link 17; for more details, see the description of example 1.

Example 3: this embodiment differs from embodiment 1 in that: as shown in fig. 19 to 22, the swinging block 4 and the adjusting screw 5 are installed at the rear part of the base 1, two symmetrical shaft seats 36 and a fifth pin 37 which is arranged between the two shaft seats 36 and is used for being in contact fit with the third pin 23 are arranged at the corresponding parts of the bracket 2 and matched with the triangle 14, the shaft seats 36 are metal plates, and the shaft seats 36 are arranged at the rear end of the bracket 2 and are welded and fixed with the bracket 2; the fifth pin 37 is located above the third pin 23 and is disposed to intersect the third pin 23, specifically, as shown in fig. 20 and 21, the central axis of the fifth pin 37 is perpendicular to the central axis of the third pin 23.

In order to further reduce friction, the third pin 23 and the fifth pin 37 are respectively sleeved with a shaft sleeve 38, the shaft sleeves 38 are respectively connected with the third pin 23 and the fifth pin 37 in a rotating way, in the embodiment, the two shaft sleeves 38 are in point contact, and the two shaft sleeves can rotate, so that friction can be effectively reduced.

When a person sits on the swivel chair to lean backwards, the bracket 2 rotates to enable the fifth pin 37 to press the third pin 23 in the swinging block downwards, and the adjusting screw 5 is pulled to move towards the direction of the compression spring.

Claims

1. The utility model provides a swivel chair chassis, includes the base that is used for connecting the gas pole, is used for connecting the bracket of seat support, and the bracket links to each other characterized by with the base through the pivot that the level set up: the device also comprises a swinging block and a horizontally arranged adjusting screw rod, one end of the adjusting screw rod is inserted into the base, the other end of the adjusting screw rod is exposed out of the base, a part of the adjusting screw rod exposed out of the base is sleeved with a spring, and a threaded section of the adjusting screw rod exposed out of the base is in threaded fit with a nut for adjusting the deformation degree of the spring; the swinging block is arranged in the base, the middle part of the swinging block is hinged with the base, one end of the swinging block is hinged with the end of the adjusting screw inserted into the base, and the other end of the swinging block is in contact fit with the corresponding part of the bracket when the bracket rotates so as to enable the swinging block to swing, and the adjusting screw is pulled to move so as to enable the spring to deform to form the restoring force of the bracket; a bracket is fixedly arranged in the base, and the swinging block is hinged with the bracket through a first pin shaft; the swinging block is provided with a third pin shaft which is in contact fit with the corresponding part of the bracket; a pressing block is arranged at the corresponding part of the bracket matched with the swinging block, and a pressing groove matched with the third pin shaft is arranged at the bottom of the pressing block.

2. A swivel chair chassis according to claim 1, wherein: the support include a pair of interval parallel arrangement's backup pad, the backup pad upper end be equipped with first round pin axle complex shaft hole, the swing piece sets up between two backup pads.

3. A swivel chair chassis according to claim 1, wherein: the end of the adjusting screw, which is inserted into the base, is fixedly connected with an adjusting connecting rod, and one end of the swinging block is hinged with the adjusting connecting rod through a second pin shaft.

4. A swivel chair chassis according to claim 3, wherein: the adjusting connecting rod is provided with a through hole, and the second pin shaft is inserted in the through hole.

5. A swivel chair chassis according to claim 4, wherein: the second pin shaft is in clearance fit with the through hole.

6. A swivel chair chassis according to claim 4, wherein: an intermediate connecting rod is further arranged between the swinging block and the adjusting connecting rod, one end of the intermediate connecting rod is connected with the adjusting connecting rod through a second pin shaft, and the other end of the intermediate connecting rod is hinged with the adjusting connecting rod through a fourth pin shaft.

7. A swivel chair chassis according to claim 6, wherein: the middle connecting rod comprises two waist-shaped plates which are symmetrically arranged in parallel, the two waist-shaped plates are fixedly connected through at least one connecting plate, and the adjusting connecting rod is arranged between the two waist-shaped plates.

8. A swivel chair chassis according to claim 1, wherein: the swing block is triangular as a whole.

9. A swivel chair chassis according to claim 8, wherein: the swinging block comprises two parallel symmetrically arranged triangular plates, the two triangular plates are fixedly connected through at least one connecting plate, two corners of each triangular plate are respectively hinged with the base and the adjusting screw, the other corner of each triangular plate is in contact fit with the corresponding part of the bracket, and the third pin shaft is arranged on the other corner of each triangular plate.

10. A swivel chair chassis according to claim 1, wherein: the swing block and the adjusting screw are arranged at the rear part of the base, the pressing block is fixedly arranged at the rear end of the bracket, and the bracket rotates to enable the pressing block to press down the swing block, so that the adjusting screw is pulled to move towards the direction of the compression spring.

11. A swivel chair chassis according to claim 1, wherein: two symmetrical shaft seats and a fifth pin shaft which is arranged between the two shaft seats and is in contact fit with the third pin shaft are arranged at corresponding positions of the bracket and matched with the triangular plate, the shaft seats are fixedly connected with the bracket, and the fifth pin shaft is positioned above the third pin shaft and is arranged in a crossing manner with the third pin shaft.

12. A swivel chair chassis according to claim 11, wherein: the central axis of the fifth pin shaft is perpendicular to the central axis of the third pin shaft.

13. A swivel chair chassis according to claim 11, wherein: and the third pin shaft and the fifth pin shaft are respectively sleeved with a shaft sleeve, and the shaft sleeves are respectively connected with the third pin shaft and the fifth pin shaft in a rotating way.

14. A swivel chair chassis according to claim 11, wherein: the swinging block and the adjusting screw are arranged at the rear part of the base, the shaft seat is fixedly arranged at the rear end of the bracket, and the bracket rotates to enable the fifth pin shaft to press down the swinging block, so that the adjusting screw is pulled to move towards the direction of the compression spring.

15. A swivel chair chassis according to claim 1, wherein: and a lug is arranged at a corresponding part of the bracket matched with the triangular plate, the lug is hinged with a U-shaped pull ring, and the third pin shaft is arranged in a U-shaped groove of the U-shaped pull ring in a penetrating way.

16. A swivel chair chassis according to claim 15, wherein: the swing block and the adjusting screw are arranged at the front part of the base, the lug and the U-shaped pull ring are arranged at the front end of the bracket, and the bracket rotates to enable the U-shaped pull ring to lift the swing block, so that the adjusting screw is pulled to move towards the direction of the compression spring.

17. A swivel chair chassis according to claim 1, wherein: two ends of the spring are respectively provided with a spring bracket, and the two ends of the spring are respectively propped against the nut and the side plate of the base through the adjacent spring brackets.

18. A swivel chair chassis according to claim 1, wherein: the chassis comprises an adjusting handle, the adjusting handle is connected with a sleeve, the sleeve is sleeved outside the spring, and the nut is fixedly arranged at the bottom of the sleeve barrel.

19. A swivel chair chassis according to claim 1, wherein: the base comprises a bottom plate and side plates vertically arranged on two sides of the bottom plate, wherein one side plate is provided with a through hole for the penetration of the adjusting screw, and the other side plate is correspondingly provided with an opening for the penetration of the adjusting screw into the base.