CN106551544B

CN106551544B - Swivel chair tray

Info

Publication number: CN106551544B
Application number: CN201510650932.5A
Authority: CN
Inventors: 何基
Original assignee: UE Furniture Co Ltd
Current assignee: UE Furniture Co Ltd
Priority date: 2015-09-27
Filing date: 2015-09-27
Publication date: 2023-06-02
Anticipated expiration: 2035-09-27
Also published as: CN106551544A

Abstract

The utility model discloses a swivel chair tray, which comprises a base, a bracket, a swinging piece, a horizontally arranged adjusting screw rod, a spring, a nut and a support, wherein the bracket is connected with the base through a rotating shaft; the swinging piece is arranged in the base in a lying way, the middle part of the swinging piece is hinged with the base, one end of the swinging piece is hinged with the end of the adjusting screw, which is inserted into the base, the bracket is provided with a driving frame which extends into the base, and when the bracket rotates, the other end of the swinging piece is pushed or pulled by the driving frame to enable the swinging piece to rotate, and then the adjusting screw is driven to move so as to enable the spring to deform so as to form restoring force of the bracket. The tray is transversely arranged, so that the shape is more regular, the space waste can be reduced during boxing and transportation, and the boxing amount is increased.

Description

Swivel chair tray

Technical Field

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

Background

The swivel chair tray, also called swivel chair chassis, is an important component 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 tray.

For example, chinese patent (bulletin number: CN 2922618) discloses a: the chair tray 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 tray, namely, the included angles formed by the axes of the knob, the spring and the carriage screw and the middle plate or the 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.

However, the above patents have a common disadvantage in that: the knob, the spring and the adjusting bolt are basically vertically or nearly vertically arranged on the tray, namely, the included angle formed by the axes of the knob, the spring and the adjusting bolt and the tray or the chair seat is 70-90 degrees, so that the knob exposed below the tray 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 can not 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 tray which not only ensures that the swivel chair is compact and beautiful, but also is convenient for adjusting the compression degree of the spring and can improve the boxing amount.

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

the swivel chair tray comprises a base for connecting an air rod, a bracket for connecting a chair seat, a swinging piece, a horizontally arranged adjusting screw rod, a spring, a nut, a spring, a screw rod, a nut and a bolt, wherein the bracket is used for connecting the air rod and the chair seat; the swinging piece is arranged in the base in a lying way, the middle part of the swinging piece is hinged with the base, one end of the swinging piece is hinged with the end of the adjusting screw, which is inserted into the base, the bracket is provided with a driving frame which extends into the base, and when the bracket rotates, the other end of the swinging piece is pushed or pulled by the driving frame to enable the swinging piece to rotate, and then the adjusting screw is driven to move so as to enable the spring to deform so as to form restoring force of the bracket.

Preferably, the central axis of rotation of the swinging member is perpendicular to the horizontal plane, and the rotation direction of the swinging member is a horizontal direction. The swinging piece is arranged in a lying way, so that the driving structure inside the base can be simplified, the driving related parts are reduced, the overall height of the base can be further reduced, the tray is light and miniaturized, the tray is almost hidden below the swivel chair seat in terms of use effect, and the aesthetic degree and grade of the swivel chair are improved.

Preferably, a support is fixedly arranged in the base, the swinging piece is hinged with the support through a first pin shaft, and the first pin shaft is perpendicular to the horizontal plane. The support can be connected with the base in a welding mode.

Preferably, the support comprises a pair of support plates which are arranged in parallel at intervals, one end of each support plate is fixedly connected with the side plate of the base, the support plates are correspondingly provided with shaft holes matched with the first pin shafts, and the swinging piece is arranged between the two support plates. The swinging piece is arranged between the two supporting plates and is not in direct contact with the base, so that friction force is reduced, and rotation is smoother.

Preferably, the support comprises a support plate which is horizontally arranged, one end of the support plate is fixedly connected with the side plate of the base, the base plate of the support plate and the base is correspondingly provided with a shaft hole matched with the first pin shaft, and the swinging piece is arranged between the support plate and the base plate of the base. The supporting plate is matched with the bottom plate of the base to serve as a shaft seat of the first pin shaft, so that the number of parts is reduced, and the structure is simplified.

Preferably, the swinging member is L-shaped as a whole.

Preferably, the swinging piece comprises two L-shaped plates which are symmetrically arranged in parallel, the two L-shaped plates are fixedly connected through at least one connecting plate, the middle part of each L-shaped plate is hinged with the base, one arm of each L-shaped plate is hinged with the adjusting screw, and the other arm of each L-shaped plate is matched with the driving frame.

Preferably, a second pin shaft is arranged between the other arms of the two L-shaped plates, a stress block is rotatably sleeved on the second pin shaft, and the stress block is provided with a stress surface which is always contacted with the corresponding part of the driving frame. When the swinging piece swings, the moving track of the second pin shaft is arc-shaped, and the stress block is preferably a plane because the stress block is directly contacted with the driving frame and pushed by the driving frame, so that the stress block rotates along with the swinging piece to always keep propping against the driving frame when the swinging piece swings, and the force of the driving frame can be completely transmitted to the swinging piece without loss of force.

In order to be convenient to match with the swinging piece, preferably, a third pin shaft for pushing the swinging piece is arranged at the lower end of the driving frame, and the left end and the right end of the third pin shaft are rotatably connected with the driving frame. The arrangement of the third pin shaft changes the contact form into line contact, so that friction force during contact is reduced.

Preferably, a shaft sleeve is rotatably sleeved on the third pin shaft. The shaft sleeve can rotate, so that rolling friction force generated by the shaft sleeve is smaller than sliding friction force generated by line contact when the shaft sleeve is matched with the driving frame, particularly the stress block, and the third pin shaft can be matched with the driving frame more smoothly.

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

Preferably, the swinging member comprises two parallel symmetrically arranged triangular plates, the plane of the triangular plates is parallel to the plane of the bottom plate of the base, 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 matched with the driving frame.

Preferably, a second pin shaft is arranged between two corners of two triangular plates matched with the driving frame, a stress block is rotatably sleeved on the second pin shaft, and the stress block is provided with a stress surface which is always contacted with the corresponding part of the driving frame. Similarly, when the swinging piece swings, the moving track of the second pin shaft is in an arc shape, and the stress block is in contact with the driving frame directly and is pushed by the driving frame, and the stress surface is preferably a plane, so that the stress block rotates along with the swinging piece to always keep propping against the driving frame when the swinging piece swings, and the force of the driving frame can be completely transmitted to the swinging piece without loss of force.

Preferably, a third pin shaft for pushing the stress block is arranged at the lower end of the driving frame, and the left end and the right end of the third pin shaft are rotatably connected with the driving frame. The arrangement of the third pin shaft changes the contact form into line contact, so that friction force during contact is reduced.

Preferably, the end of the swinging piece matched with the driving frame is penetrated with a fourth pin shaft, a bracket is arranged in the base, one end of the bracket is hinged with the lower end of the driving frame, the other end of the bracket is penetrated with a fifth pin shaft, the fourth pin shaft and the fifth pin shaft are arranged in a crossing way and are hooked together, and when the bracket rotates, the driving frame pulls the bracket, and then the swinging piece is pulled to rotate. Because the installation positions of the components are different, when the bracket rotates, the bracket can be pulled to move by the driving frame, and then the bracket drives the swinging piece to rotate.

Preferably, the fifth pin shaft is rotatably sleeved with a shaft sleeve, the fourth pin shaft is rotatably sleeved with a stress block, the stress block is provided with a stress surface which is always contacted with the corresponding part of the driving frame, and the shaft sleeve is contacted with the stress surface. Similarly, when the swinging piece swings, the movement track of the fourth pin shaft is in an arc shape, and the stress block is in direct contact with the bracket and is pushed by the bracket, and the stress surface is preferably a plane, so that the stress block rotates along with the swinging piece to always keep propping against the bracket when the swinging piece swings, the force of the bracket can be completely transmitted to the swinging piece, and no force is lost; meanwhile, the shaft sleeve can rotate, so that rolling friction force generated by the shaft sleeve is smaller than sliding friction force generated by line contact when the shaft sleeve is matched with the stress block, and the fourth pin shaft and the driving frame can be matched more smoothly.

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 device further comprises an adjusting handle, wherein 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 sleeve is provided with an extension section, and the adjusting handle and the extension section are sleeved together in a circumferentially fixed and axially movable manner. When the adjusting nut is not needed, the adjusting handle can be slid to the innermost position, so that the adjusting handle is completely hidden below the chair seat, and when the adjusting nut is needed, the adjusting handle is pulled out for adjustment.

Preferably, a sliding groove is formed in the side wall of the extension section along the axial direction, and a sliding block is correspondingly arranged on the hollow inner wall of the adjusting handle and is clamped in the sliding groove.

Preferably, the base comprises a bottom plate and side plates vertically arranged on two sides of the bottom plate, and a through hole for the penetration of the adjusting screw is formed in one side plate.

Preferably, the upper end of the driving frame is welded and fixed with the bracket, and the lower end of the driving frame extends into the base.

Preferably, an air rod jack for inserting an air rod is arranged in the center of the base, the swinging piece is arranged around the air rod jack, the center of the base is taken as a boundary, the hinge joint of the swinging piece and the base and the spring are respectively positioned at the left side and the right side of the center of the base, and the adjusting screw and the driving frame are respectively positioned at the front side and the rear side of the center of the base. By adopting the structural design, the existing space can be fully utilized under the condition that the driving structural form of the utility model is not affected, the structure is more compact, the volume is reduced, and the tray is more miniaturized.

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

the swivel chair tray 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 piece in the base, so that the swivel chair tray is ingenious in transverse installation, the axis of the springs and the axis of the adjusting handle are basically positioned on the same line, the swivel chair tray does not need to be bent down to enable adjustment to be more convenient, after the swivel chair tray 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 outside from the appearance, the overall appearance of the swivel chair is simple and elegant, the function of convenient adjustment is met, and the grade of products is improved.

Meanwhile, the tray is transversely installed, 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.

Still further, the swinging piece lies in the base, so that not only can the driving structure inside the base be simplified and the driving related parts be reduced, but also the overall height of the base can be further reduced, and the tray is further light and miniaturized.

Meanwhile, the swinging piece is arranged in the base in a lying way, so that the installation of the adjusting screw and the spring is more flexible, the adjusting screw and the spring can be installed at the front part or the rear part of the base according to actual needs, and the installation direction of the swinging piece is only required to be changed correspondingly.

Drawings

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

fig. 2 is a schematic view showing the internal structure of the tray in embodiment 1;

fig. 3 is a schematic view showing the internal structure of the tray in embodiment 1 at another angle;

fig. 4 is a schematic top view of the tray in embodiment 1;

fig. 5 is a schematic plan view showing the cooperation of the driving frame and the swinging member in embodiment 1;

FIG. 6 is a schematic view of the hinged engagement of the oscillating piece with the adjusting screw of example 1;

fig. 7 is a schematic diagram showing the split structure of the bracket, the swinging member and the base in embodiment 1;

FIG. 8 is a schematic view of the split structure of the bracket, the swinging member and the base of embodiment 1 at another angle;

fig. 9 is an exploded view of the tray in example 1;

fig. 10 is a schematic view showing the internal perspective state of the base when the bracket is rotated 9 degrees in embodiment 1;

FIG. 11 is a schematic view showing the planar state of the base when the bracket is rotated 9 degrees in embodiment 1;

FIG. 12 is a schematic view showing the internal perspective of the base when the bracket is rotated 19 degrees in example 1;

FIG. 13 is a schematic view showing the planar state of the base when the bracket is rotated 19 degrees in embodiment 1;

fig. 14 is a schematic perspective view of the tray in embodiment 2;

fig. 15 is a schematic plan view of the tray in embodiment 2;

FIG. 16 is a schematic view showing the internal perspective of the base when the bracket is rotated 9 degrees in example 2;

fig. 17 is a schematic plan view showing the state of the base when the bracket is rotated 9 degrees in embodiment 2;

FIG. 18 is a schematic view showing the internal perspective of the base when the bracket is rotated 19 degrees in example 2;

FIG. 19 is a schematic view showing the planar state of the base when the bracket is rotated 19 degrees in embodiment 2;

fig. 20 is a schematic view showing the internal structure of the tray in embodiment 3;

fig. 21 is a schematic view showing the internal structure of the tray in embodiment 3 at another angle;

fig. 22 is a schematic view showing the internal planar structure of the tray in embodiment 3;

FIG. 23 is an exploded view of the tray in example 3;

FIG. 24 is a schematic view showing the hinged engagement of the oscillating piece with the adjusting screw in example 3;

FIG. 25 is a schematic view showing the internal perspective of the base when the bracket is rotated 9 degrees in example 3;

FIG. 26 is a schematic view showing the planar state of the base when the bracket is rotated 9 degrees in embodiment 3;

FIG. 27 is a schematic view showing the internal perspective of the base when the bracket is rotated 19 degrees in example 3;

FIG. 28 is a schematic view showing the planar state of the base when the bracket is rotated 19 degrees in embodiment 3;

fig. 29 is a schematic view showing the internal planar structure of the tray in embodiment 4;

fig. 30 is a schematic view showing the internal perspective structure of the tray in embodiment 4.

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 tray 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 tray is a region far away from the back, and the rear end of the tray is a region close to the back.

Example 1: the embodiment provides a swivel chair tray, as shown in fig. 1-13, the swivel chair tray 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 tray further comprises a swinging piece 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 initial compression degree of the spring 26 is in threaded fit with 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 adjusting screw 5 does not necessarily mean that the entire section of the screw 5 is threaded from beginning to end, but may be threaded only in the portion that cooperates with the nut 28.

The swinging member 4 is arranged in the base 1 in a lying way, the middle part of the swinging member 4 is hinged with the base 1, one end of the swinging member 4 is hinged with the end of the adjusting screw 5 inserted into the base 1, the bottom surface of the bracket 2 is provided with a driving frame 6 extending into the base 1, and when the bracket 2 rotates, the other end of the swinging member 4 is pushed or pulled by the driving frame 6 to enable the swinging member 4 to rotate, and then the adjusting screw 5 is driven to move so as to enable the spring 26 to deform to form restoring force of the bracket 2. The central axis of rotation of the swinging member 4 is perpendicular to the horizontal plane, and the rotation direction of the swinging member 4 is horizontal, and since the end of the adjusting screw 5 inserted into the base 1 is restricted by the swinging member 4, the swinging member cannot rotate in the circumferential direction.

Specifically, the base 1 includes a bottom plate 7 and

side plates

8a and 8b vertically disposed on two sides of the bottom plate 7, a through hole 9 for the penetration of the adjusting screw 5 is disposed on one of the side plates 8a, the upper end of the driving frame 6 is welded and fixed to the bottom surface of the bracket 2, and the lower end of the driving frame 6 extends into the base 1. Specifically, the driving frame 6 includes a base 34 and driving plates 35 extending downward along two sides of the base 34, and for improving the firmness and strength, the two driving plates 35 are connected by at least one reinforcing plate 36.

As shown in fig. 7 to 9, a spring holder 29 is provided at each of both ends of the spring 26, and both ends of the spring 26 are abutted against the nut 28 and the side plate 8a of the base through the adjacent spring holders 29. The swivel chair tray of the utility model further 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. Still further, the sleeve 31 has an extension section 32, and the adjusting handle 30 and the extension section 32 are sleeved together in a circumferentially fixed and axially movable manner; specifically, a sliding groove 33 is provided on the side wall of the extension section 32 along the axial direction, and a sliding block (not shown) is correspondingly provided on the hollow inner wall of the adjustment handle 30, and the sliding block is clamped in the sliding groove 33.

As shown in fig. 4, 7 and 8, a bracket 10 is fixedly arranged in the base 1, and the swinging piece 4 is hinged with the bracket 10 through a first pin 11; specifically, the bracket 10 includes a horizontally disposed support plate 12, one end of the support plate 12 is fixedly connected with the side plate 8a of the base 1, a shaft hole 13 corresponding to the first pin 11 is correspondingly formed on the support plate 12 and the bottom plate 7 of the base 1, and the swinging member 4 is disposed between the support plate 12 and the bottom plate 7 of the base 1. The structural form can reduce parts to the greatest extent and optimize the internal structure of the base.

As another implementation manner, the bracket 10 may further include a pair of support plates 12 disposed in parallel at a distance, the support plates 12 are perpendicular to the side plate 8a, shaft holes 13 corresponding to the first pins 11 are disposed on the support plates 12, and the swinging member 4 is disposed between the two support plates 12 and hinged to the two support plates 12 through the first pins 11.

As shown in fig. 5, the air bar insertion hole 37 for inserting the air bar is located at the middle position in the width direction of the base 1, in this embodiment, the hinge position of the swinging member 4 and the bracket 10 is located at the same side of the middle of the base 1 as the spring 26, and the spring 26 is located at the front end or the rear end of the base, and of course, the air bar insertion hole can be selectively arranged at two sides of the middle of the base 1 according to the requirement. When the bracket 2 rotates backwards, the driving frame 6 pushes the swinging piece 4 to rotate so as to compress the spring.

As shown in fig. 4, 6 and 9, the swinging member 4 is integrally L-shaped, the swinging member 4 includes two L-shaped plates 14 arranged in parallel and symmetrically, the two L-shaped plates 14 are fixedly connected through at least one connecting plate 15, the middle of the L-shaped plate 14 is hinged with the supporting plate 12, one arm of the L-shaped plate 14 is hinged with the adjusting screw 5, and the other arm of the L-shaped plate 14 is matched with the driving frame 6. Specifically, a second pin 16 is disposed between the other arms of the two L-shaped plates 14, a stress block 17 is rotatably sleeved on the second pin 16, the stress block 17 has a stress surface 18 that is always in contact with the corresponding part of the driving frame 6, and the stress surface 18 is a plane. And a third pin shaft 19 for pushing the stress block 17 is penetrated at the lower end of the driving frame 6 and is matched with the stress block 17, the left and right ends of the third pin shaft 19 are rotatably connected with a driving plate 35 of the driving frame 6, and in order to further reduce friction, a shaft sleeve 20 is rotatably sleeved on the third pin shaft 19, and the shaft sleeve 20 is contacted with the stress surface 18.

After the tray 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 piece 4 and the gravity of the bracket and the chair seat, and then the nut 28 moves horizontally along the axis direction of the adjusting screw 5, so that the initial compression degree of the spring can be adjusted, and the aim of adjusting the tilting force of the spring to the chair is fulfilled. When a person sits on the swivel chair to lean backwards, the bracket 2 rotates to enable the driving frame 6 to push the swinging piece 4 to rotate, and then the adjusting screw 5 is pulled to move towards the direction of the compression spring 26, so that the spring 26 generates elastic force to enable the bracket 2 to reset.

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: the present embodiment is the same as embodiment 1 in principle, except that: as shown in fig. 14 to 19, in order to make the rotation more free and reduce the size of the parts as much as possible, and also to satisfy the requirement of the firmness, the swinging member 4 is in a triangle shape as a whole, the swinging member 4 comprises two triangle plates 21 which are arranged in parallel and symmetrically, the plane of the triangle plates 21 is parallel to the plane of the bottom plate 7 of the base 1, the two triangle plates 21 are fixedly connected by at least one connecting plate 15, two corners of the triangle plates 21 are respectively hinged with the base 1 and the adjusting screw 5, and the other corner of the triangle plates 21 is matched with the driving frame 6.

Specifically, a second pin shaft 16 is arranged between two corners of two triangular plates 21 matched with the driving frame 6, a stress block 17 is rotatably sleeved on the second pin shaft 16, and the stress block 17 is provided with a stress surface 18 which is always contacted with the corresponding part of the driving frame 6; correspondingly, a third pin shaft 19 for pushing the stress block 17 is arranged at the lower end of the driving frame 6 in a penetrating way, the left end and the right end of the third pin shaft 19 are rotatably connected with the driving frame 6, a shaft sleeve 20 is rotatably sleeved on the third pin shaft 19 for further reducing friction, and the shaft sleeve 20 is contacted with the stress surface 18.

Still further, unlike the embodiment 1, the swinging member 4 is reversely installed, that is, the spring 26 is positioned at the left side of the base 1 and at the front end of the base 1, and the hinge of the swinging member 4 with the bracket 10 is positioned at the right side of the base 1, as shown in fig. 14 and 15, the bracket 2 rotates backward to make the driving frame 6 push the swinging member 4 to rotate and compress the spring.

Example 3: the principle of the present embodiment is the same as that of the above embodiment, except that the driving frame drives the swinging member to rotate by pulling.

Specifically, as shown in fig. 20 to 28, the end of the swinging member 4 matched with the driving frame 6 is provided with a fourth pin 22 in a penetrating manner, because the driving frame 6 moves away from the swinging member 4 due to the arrangement of the rotating direction of the bracket 2, a bracket 23 is arranged in the base 1, the bracket 23 is formed by connecting two parallel brackets 24 at intervals and at least one connecting plate 15 connected with the two brackets 24, one end of the bracket 23 is hinged with the lower end of the driving frame 6, the other end of the bracket 23 is provided with a fifth pin 25 in a penetrating manner, the fourth pin 22 and the fifth pin 25 are arranged in a crossing manner and are hooked together, and when the bracket 2 rotates, the driving frame 6 pulls the bracket 23, and then pulls the swinging member 4 to rotate.

Still further, a shaft sleeve 20 is rotatably sleeved on the fifth pin shaft 25, a stress block 17 is rotatably sleeved on the fourth pin shaft 22, the stress block 17 is provided with a stress surface 18 which is always contacted with the shaft sleeve 20, and the shaft sleeve 20 is contacted with the stress surface 18.

Example 4: the principle of this embodiment is the same as that of the foregoing embodiment 1, and the swing member 4 is in an L shape as a whole, which is different in that, as shown in fig. 29 and 30, the air bar jack 37 for inserting an air bar is located at the center of the base 1, and the L-shaped swing member 4 is disposed around the air bar jack 37, in this embodiment, the center of the base 1, that is, the air bar jack 37, is taken as a boundary, the bracket 10 and the spring (not shown) are respectively located at the left and right sides of the air bar jack 37, the spring is located at the front end or the rear end of the base, and the adjusting screw 5 and the driving frame 6 are respectively located at the front and rear sides of the air bar jack 37.

Claims

1. The utility model provides a swivel chair tray, includes the base that is used for connecting the gas pole, the bracket that is used for connecting the 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 piece 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 initial deformation degree of the spring; the swinging piece is arranged in the base in a lying way, the middle part of the swinging piece is hinged with the base, one end of the swinging piece is hinged with the end of the adjusting screw rod inserted into the base, the bracket is provided with a driving frame extending into the base, and when the bracket rotates, the other end of the swinging piece is pushed or pulled by the driving frame to enable the swinging piece to rotate, and then the adjusting screw rod is driven to move so as to enable the spring to deform to form restoring force of the bracket; the swinging piece comprises a second pin shaft, a stress block is sleeved on the second pin shaft in a rotating way, the stress block is provided with a stress surface which is always contacted with the corresponding part of the driving frame, a third pin shaft for pushing the swinging piece is arranged at the lower end of the driving frame, the left end and the right end of the third pin shaft are connected with the driving frame in a rotating way, and a shaft sleeve is sleeved on the third pin shaft in a rotating way.

2. A swivel chair tray according to claim 1, wherein: the central axis of the swing piece is vertical to the horizontal plane, and the rotation direction of the swing piece is the horizontal direction.

3. A swivel chair tray according to claim 1, wherein: the base is internally and fixedly provided with a support, the swinging piece is hinged with the support through a first pin shaft, and the first pin shaft is perpendicular to the horizontal plane.

4. A swivel chair tray according to claim 3, wherein: the support include a pair of interval parallel arrangement's backup pad, backup pad one end links to each other with the curb plate of base is fixed, correspond in the backup pad set up with first round pin axle complex shaft hole, the swinging member sets up between two backup pads.

5. A swivel chair tray according to claim 3, wherein: the support include the backup pad of a level setting, backup pad one end links to each other with the curb plate of base is fixed, correspond on backup pad and the bottom plate of base set up with first round pin axle complex shaft hole, the swinging member sets up between backup pad and the bottom plate of base.

6. A swivel chair tray according to claim 1, wherein: the swinging piece is L-shaped as a whole.

7. A swivel chair tray according to claim 6, wherein: the swinging piece comprises two L-shaped plates which are symmetrically arranged in parallel, the two L-shaped plates are fixedly connected through at least one connecting plate, the middle part of each L-shaped plate is hinged with the base, one arm of each L-shaped plate is hinged with the adjusting screw, and the other arm of each L-shaped plate is matched with the driving frame.

8. A swivel chair tray according to claim 7, wherein: the second pin is disposed between the other arms of the two L-shaped plates.

9. A swivel chair tray according to claim 1, wherein: the swinging piece is triangular as a whole.

10. A swivel chair tray according to claim 9, wherein: the swinging piece comprises two triangular plates which are arranged in parallel and symmetrical mode, the plane of the triangular plate is parallel to the plane of the bottom plate of the base, the two triangular plates are fixedly connected through at least one connecting plate, two corners of the triangular plate are respectively hinged with the base and the adjusting screw, and the other corner of the triangular plate is matched with the driving frame.

11. A swivel chair tray according to claim 10, wherein: the second pin shaft is arranged between two corners of two triangular plates matched with the driving frame.

12. A swivel chair tray 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.

13. A swivel chair tray according to claim 1, wherein: the spring is characterized by further comprising an adjusting handle, wherein 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.

14. A swivel chair tray according to claim 13, wherein: the sleeve is provided with an extension section, and the adjusting handle and the extension section are sleeved together in a circumferential fixed and axial moving mode.

15. A swivel chair tray as claimed in claim 14, wherein: a sliding groove is formed in the side wall of the extension section along the axial direction, a sliding block is correspondingly arranged on the hollow inner wall of the adjusting handle, and the sliding block is clamped in the sliding groove.

16. A swivel chair tray according to claim 1, wherein: the base comprises a bottom plate and side plates vertically arranged on two sides of the bottom plate, and a through hole for the penetration of an adjusting screw is formed in one side plate.

17. A swivel chair tray according to claim 1, wherein: the upper end of the driving frame is welded and fixed with the bracket, and the lower end of the driving frame extends into the base.

18. A swivel chair tray according to claim 6, wherein: the center of the base is provided with an air rod jack for inserting an air rod, the swinging piece is arranged around the air rod jack, the center of the base is taken as a boundary, the hinge joint of the swinging piece and the base and the spring are respectively positioned at the left side and the right side of the center of the base, and the adjusting screw and the driving frame are respectively positioned at the front side and the rear side of the center of the base.