CN106889799B

CN106889799B - Swivel chair tray

Info

Publication number: CN106889799B
Application number: CN201511031782.6A
Authority: CN
Inventors: 何基
Original assignee: UE Furniture Co Ltd
Current assignee: UE Furniture Co Ltd
Priority date: 2015-12-19
Filing date: 2015-12-19
Publication date: 2023-08-11
Anticipated expiration: 2035-12-19
Also published as: CN106889799A

Abstract

The utility model discloses a swivel chair tray, which comprises a base, a bracket and a seesaw, wherein the bracket is connected with the base through a rotating shaft which is horizontally arranged, the front end of the seesaw is hinged with two sides of the base, the seesaw is also connected with the rear end of the bracket to drive the bracket to rotate, the swivel chair tray also comprises a swinging frame and an adjusting screw which is horizontally arranged, one end of the adjusting screw is inserted into the base, the other end of the adjusting screw is exposed out of the base, a part of the adjusting screw exposed out of the base is sleeved with a spring, and a nut for adjusting the initial deformation degree of the spring is in threaded fit with a threaded section of the adjusting screw; the swing frame lies in the base and the middle part of swing frame is articulated with the base, and the one end and the adjusting screw of swing frame are articulated, and the wane has a drive frame, and the other end of swing frame is driven so that take place to rotate by the drive frame when the wane rotates, and then drives adjusting screw and removes the restoring force that makes the spring warp in order to form the wane. The design of the utility model ensures that a user does not need to bend down to squat down, and the adjustment is more convenient.

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; the back steel plate seat 21 is rotationally connected with the middle plate, meanwhile, the back steel plate seat 21 is connected with the upper plate 18 through the U-shaped supporting frame 20, when the chair leans, the back steel plate seat 21 rotates around the middle plate, meanwhile, the upper plate 18 is pulled down, the upper plate 18 rotates around the middle plate, the rotation amplitude of the back steel plate seat 21 is large, the rotation amplitude of the upper plate 18 is small, when a person sits on the chair and leans backwards, the upper half body and the lower half body are more stretched, and the upper half body can be leaned to a larger extent, so that the whole person feel more comfortable.

In the above patent, the spring plays a reset role on the tilting of the chair, and it can be seen from this patent that the knob, the spring and the carriage screw are basically vertically or almost vertically mounted on the tray, that is, the included angle formed by the axes of the knob, the spring and the carriage screw and the middle plate or the seat is 70-90 degrees, if the elastic force of the spring is to be adjusted to adjust the reset force of the spring on the tilting of the chair, the knob needs to be turned down or bent up by rotating the knob to adjust the up-down position of the knob on the carriage screw, 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 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. Still further, in such a structural form, the user needs to bend down to reach the lower part of the seat surface or stand up from the chair and squat down to the lower part of the seat surface to rotate the knob, which is very humanized in use and affects the convenience of use.

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 and a rocker for connecting a chair back, wherein the bracket is connected with the base through a rotating shaft which is horizontally arranged, the front end of the rocker is hinged with two sides of the base, the rocker is further connected with the rear end of the bracket and can drive the bracket to rotate when the rocker rotates, the swivel chair tray also comprises a swinging frame and an adjusting screw which is horizontally arranged, one end of the adjusting screw is inserted into the base, the other end of the adjusting screw is exposed out of the base, a spring is sleeved on the part of the adjusting screw exposed out of the base, and a nut for adjusting the initial deformation degree of the spring is in threaded fit on a threaded section of the adjusting screw exposed out of the base; the swing frame lies in the base and the middle part of swing frame is articulated with the base, and the one end of swing frame is articulated with the end that adjusting screw inserted the base, and the wane has a drive frame that extends to in the base, and the other end of swing frame is driven so that the swing frame takes place to rotate by the drive frame when the wane rotates, and then drives adjusting screw and removes and make the spring deformation in order to form the restoring force of wane.

Preferably, the central axis of rotation of the swing frame is perpendicular to the horizontal plane, and the rotation direction of the swing frame is a horizontal direction. The swing frame 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 swing frame 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, the support plates are fixedly connected with the side plates of the base, shaft holes matched with the first pin shafts are correspondingly formed in the support plates, and the swinging frame is arranged between the two support plates. The swing frame is arranged between the two support 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, the support plate is fixedly connected with the side plate of the base, the support plate and the bottom plate of the base are correspondingly provided with shaft holes matched with the first pin shafts, and the swinging frame is arranged between the support plate and the bottom 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 swing frame is L-shaped as a whole.

Preferably, the swing frame 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 frame swings, the moving track of the second pin shaft is arc-shaped, 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 frame to always keep propping against the driving frame when the swinging frame swings, and the force of the driving frame can be completely transmitted to the swinging frame without loss of force.

The driving frame is obliquely arranged, so as to be matched with the swinging frame conveniently, and preferably, a third pin shaft for pushing the swinging frame is arranged at the lower end of the driving frame, and the left end and the right end of the third pin shaft are rotationally 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 swing frame, prevent deformation and reduce the volume of the swing frame, the swing frame is preferably triangular in shape.

Preferably, the swing frame comprises two triangular plates which are symmetrically arranged in parallel, 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.

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 frame swings, the moving track of the second pin shaft is arc-shaped, 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 frame to always keep propping against the driving frame when the swinging frame swings, the force of the driving frame can be completely transmitted to the swinging frame, and no force loss exists.

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, a second pin shaft is arranged at the other end of the swinging frame, and a stress block is rotatably sleeved on the second pin shaft; a third pin shaft for pushing the swing frame is arranged at the lower end of the driving frame, and a pushing block matched with the stress block is rotatably sleeved on the third pin shaft; a ball is arranged between the push block and the stress block, two sides of the ball are respectively contacted with the push block and the stress block all the time, and the ball keeps a gap between the push block and the stress block. When the pushing block is matched with the stress block, the ball can rotate, so that the friction force can be further reduced, and the driving frame and the swinging frame are matched more smoothly.

Preferably, the force-bearing block is provided with a force-bearing surface, the push block is provided with a force-bearing surface, arc-shaped grooves are respectively arranged on the force-bearing surface and the force-bearing surface, partial arc surfaces on two sides of the ball are respectively clamped in the two arc-shaped grooves, and the maximum depth of the two arc-shaped grooves is smaller than the radius of the ball. The stress surface and the force application surface are two opposite surfaces, the stress surface and the force application surface are both planes so as to be convenient to open an arc groove to be matched with a sphere, the arc groove is just matched with the sphere, and the maximum depth of the two arc grooves is smaller than the radius of the sphere, so that a certain interval is kept between the stress surface and the force application surface, and the push block and the stress block are matched only through the sphere, and direct contact is avoided.

Preferably, the round ball is a metal ball with a smooth outer surface. This can withstand sufficient pressure and reduce friction.

For convenience in installation, the third pin shaft and the second pin shaft are preferably arranged vertically.

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 front part of the seesaw is obliquely provided with a base plate, one end of the driving frame is welded and fixed with the base plate, and the other 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 frame is arranged around the air rod jack, the center of the base is taken as a boundary, the hinge joint of the swinging frame and the base and the springs 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.

Preferably, the connection of the rocker to the rear end of the bracket means: the rear end of the bracket is transversely provided with a fourth pin shaft, a waist-shaped hole is formed in the corresponding position of the rocker, and the fourth pin shaft is arranged in the waist-shaped hole of the rocker in a penetrating mode.

Preferably, a transverse plate is welded on the bottom surface of the rear end of the bracket, two ends of the transverse plate are respectively bent into lug plates with shaft holes, the fourth pin shaft is a whole long shaft, the fourth pin shaft is arranged in the shaft holes of the two lug plates in a penetrating mode, and meanwhile two ends of the fourth pin shaft are inserted into the kidney-shaped holes of the rocker.

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, the force transmission of the swinging plates and the brackets to rotate and the adjusting screw is completed through the swinging frame in the base, 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 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 chair is simple and elegant, the function of convenient adjustment is met, and the product grade 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 swing frame lies and sets up in the base, not only can simplify the inside drive structure of base, reduces the relevant spare part of drive, still makes can further reduce the overall height of base, makes the tray still further accomplish light-weighted, miniaturization, from the result of use, can make the tray wholly almost hide in swivel chair seat below, has improved swivel chair's aesthetic measure and grade. Still further, put the knob or the adjustment handle of adjusting spring in the side of tray, the user sits on the seat support, just can reach the regulation of the compression degree of spring just can be realized to the knob of stretching one's hand to slightly roll over, has added the ergonomic consideration of adjustment operation, has improved the operating convenience.

Meanwhile, the swinging frame is arranged in the base in a lying way, so that the installation of the adjusting screw and the spring is more flexible, and 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 frame 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 perspective view of another angle of the tray in embodiment 1;

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

fig. 4 is a schematic perspective view of another angle of the tray in embodiment 1;

FIG. 5 is a schematic view showing the internal planar structure of the side-view tray of example 1;

fig. 6 is a schematic view of the internal planar structure of the tray in the top view of embodiment 1;

fig. 7 is a schematic view showing the structure of the rocker attached to the bracket in embodiment 1;

fig. 8 is a schematic view showing the internal perspective state of the base of the tray in embodiment 1;

fig. 9 is a schematic view showing a perspective view of the tray of embodiment 1 at another angle inside the base;

fig. 10 is a schematic view showing a disassembled state of the base, the bracket, and the swing frame in embodiment 1;

FIG. 11 is a schematic view showing a connection state of the swing frame and the adjusting screw, and the spring in embodiment 1;

fig. 12 is an exploded view of the tray in example 1;

fig. 13 is a schematic diagram showing the split state of the rocker, ball and swing frame in embodiment 2;

fig. 14 is a schematic view showing a split state of the rocker, the ball and the swing frame at another angle in embodiment 2;

fig. 15 is a schematic view showing the fitting state of the rocker, ball and swing frame in embodiment 2;

fig. 16 is a cross-sectional view showing the fit of the rocker, ball and swing frame in embodiment 2;

fig. 17 is a cross-sectional view showing the engagement of the rocker, ball and swing frame at another angle in embodiment 2;

fig. 18 is a schematic view showing the internal structure of the base in embodiment 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 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 a wane and the back is 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. 1-12, which comprises a base 1 for connecting an air rod, a bracket 2 for connecting a chair seat and a rocker 38 for connecting a chair back, wherein the bracket 2 is connected with the base 1 through a rotating shaft 3 which is horizontally arranged, the front end of the rocker 38 is hinged with two sides of the base 1 through fifth pin shafts 23, the rocker 38 is also connected with the rear end of the bracket 2, and the rocker 38 can drive the bracket 2 to rotate when rotating; specifically, the connection of the rocker 38 to the rear end of the bracket 2 means: the bottom surface of the rear end of the bracket 2 is welded with a transverse plate 39, two ends of the transverse plate 39 are respectively bent into an ear plate 40 with shaft holes 13, the rear end of the bracket 2 is transversely provided with a fourth pin shaft 22, the fourth pin shaft 22 is a whole long shaft, the fourth pin shaft 22 is arranged in the shaft holes 13 of the two ear plates 40 in a penetrating mode, a waist-shaped hole 41 is formed in the corresponding position of the rocker 38, meanwhile, two ends of the fourth pin shaft 22 are inserted into the waist-shaped holes 41 of the rocker 38, and the waist-shaped holes 41 play a certain avoiding role on the fourth pin shaft 22, but meanwhile, the rocker 38 can drive the bracket 2 to rotate.

The tray further comprises a swinging frame 4 and an adjusting screw 5 which is 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 dispensing screw 5 does not necessarily mean that the screw 5 is threaded throughout its length, but may be threaded only in the portion that mates with the nut 28.

The swinging frame 4 is arranged in the base 1 in a lying way, the middle part of the swinging frame 4 is hinged with the base 1, one end of the swinging frame 4 is hinged with the end of the adjusting screw 5 inserted into the base 1, and the seesaw 38 is provided with a driving frame 6 extending into the base 1; specifically, the driving frame 6 is obliquely arranged, the front part of the seesaw 38 is obliquely provided with a base plate 42, the upper end of the driving frame 6 is welded and fixed with the base plate 42, and the lower end of the driving frame 6 extends into the base 1; when the rocker 38 rotates, the other end of the swinging frame 4 is pushed by the driving frame 6 to enable the swinging frame 4 to rotate, and then the adjusting screw 5 is driven to move so as to enable the spring 26 to deform to form the restoring force of the rocker 38. The central axis of rotation of the swing frame 4 is perpendicular to the horizontal plane, and the rotation direction of the swing frame 4 is horizontal, and since the end of the adjusting screw 5 inserted into the base 1 is limited by the swing frame 4, the swing frame cannot rotate in the circumferential direction.

Specifically, as shown in fig. 6 and 8, the base 1 includes a bottom plate 7 and side plates 8a and 8b vertically disposed on two sides of the bottom plate 7, and a through hole 9 through which the adjusting screw 5 passes is provided in one of the side plates 8 a. Specifically, as shown in fig. 14, the driving frame 6 includes a base 34 and driving plates 35 extending downward along two sides of the base 34.

As shown in fig. 11 and 12, 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 by 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 (not shown) 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, wherein the sliding block is clamped in the sliding groove.

As shown in fig. 8, a bracket 10 is fixedly arranged in the base 1, and the swinging frame 4 is hinged with the bracket 10 through a first pin 11; specifically, the bracket 10 includes a horizontally disposed support plate 12, two ends of the support plate 12 are fixedly connected with the side plates 8a and 8b of the base 1, shaft holes (not shown) corresponding to the first pins 11 are correspondingly formed in the support plate 12 and the bottom plate 7 of the base 1, and the swinging frame 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 corresponding to the first pins 11 are correspondingly formed in the support plates 12, and the swinging frame 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. 8, 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 middle of the base 1 is taken as a boundary, the hinge position of the swinging frame 4 and the bracket 10 and the springs 26 are located at two sides of the middle of the base 1, the springs 26 are located at the front end or the rear end of the base, and the same side of the middle of the base 1 can be optionally arranged according to the requirement. The rocker 38, when rotated backwards, causes the driving frame 6 to push the swing frame 4 to rotate, thereby compressing the spring.

As shown in fig. 3, 4, 6, 10, 11 and 12, the swing frame 4 is L-shaped, the swing frame 4 includes two parallel symmetrically arranged L-shaped plates 14, the two L-shaped plates 14 are fixedly connected by 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 frame 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 and leans back, the bracket 2 rotates to enable the driving frame 6 to push the swinging frame 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 rocker 38 and 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.

Still further, as shown in fig. 6, the air bar jack 37 for inserting an air bar is located at the center of the base 1, and the L-shaped swing frame 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 hinge position of the swing frame 4 and the base 1, that is, the position of the first pin 11 and the spring 26 are located at the left and right sides of the air bar jack 37, the spring 26 is located at the front end or the rear end of the base, and the adjusting screw 5 and the driving frame 6 are located at the front and rear sides of the air bar jack 37, so that the present space can be fully utilized without affecting the driving structure of the present utility model, the structure is more compact, the volume is reduced, and the tray is more miniaturized.

Example 2: the present embodiment is the same as embodiment 1 in principle, except that: as shown in fig. 13 to 17, in order to further reduce friction force and make the fit smoother, a second pin 16 is arranged at the other end of the swinging frame 4, and a stress block 17 is rotatably sleeved on the second pin 16; a third pin shaft 19 for pushing the swinging frame 4 is arranged at the lower end of the driving frame 6, a pushing block 43 matched with the stress block 17 is rotatably sleeved on the third pin shaft 19, and the third pin shaft 19 and the second pin shaft 16 are vertically arranged; as shown in fig. 15, a ball 44 is provided between the push block 43 and the force-receiving block 17, both sides of the ball 44 are always in contact with the push block 43 and the force-receiving block 17, respectively, and the ball 44 maintains a gap 47 between the push block 43 and the force-receiving block 17. The spherical surface 44 is generally the spherical surface that contacts the pusher 43 and the force-receiving block 17.

Specifically, the force-bearing block 17 has a force-bearing surface 18, the push block 43 has a force-bearing surface 45, the force-bearing surface 18 and the force-bearing surface 45 are both planes, arc-shaped grooves 46 are respectively arranged on the force-bearing surface 18 and the force-bearing surface 45, partial arc surfaces on two sides of the round ball 44 are respectively clamped in the two arc-shaped grooves 46, and the maximum depth of the two arc-shaped grooves 46 is smaller than the radius of the round ball 44; the ball 44 is a metal ball with a smooth outer surface, and if necessary, lubricating oil can be smeared on the surface of the ball 44.

Example 3: the present embodiment is the same as embodiment 1 in principle, except that: as shown in fig. 18, 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 swing frame 4 is in a triangle shape as a whole, the swing frame 4 includes two triangle plates 21 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 (not shown), 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, in order to further reduce friction and make the engagement smoother, the second pin 16 and the third pin 19 may also be engaged by a ball as in embodiment 2.

Claims

1. The utility model provides a swivel chair tray, includes the base that is used for connecting the gas pole, is used for connecting the bracket of seat support and is used for connecting the wane of back of the chair, and the bracket links to each other with the base through the pivot that the level set up, and the wane front end is articulated with the base both sides, and the wane still links to each other with the bracket rear end and can drive the bracket and rotate when the wane rotates, characterized by: the device also comprises a swinging frame and a horizontally arranged adjusting screw rod, wherein 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 initial deformation degree of the spring is in threaded fit on the threaded section of the adjusting screw rod exposed out of the base; the swinging frame is arranged in the base in a lying way, the middle part of the swinging frame is hinged with the base, one end of the swinging frame is hinged with the end of the adjusting screw rod inserted into the base, the rocker is provided with a driving frame extending into the base, and when the rocker rotates, the other end of the swinging frame is driven by the driving frame to enable the swinging frame to rotate, and then the adjusting screw rod is driven to move so as to enable the spring to deform so as to form the restoring force of the rocker; the central shaft of the swing frame is vertical to the horizontal plane, and the rotation direction of the swing frame is the horizontal direction; the base is internally and fixedly provided with a support, the swing frame is hinged with the support through a first pin shaft, and the first pin shaft is perpendicular to the horizontal plane.

2. A swivel chair tray according to claim 1, wherein: the support include a pair of interval parallel arrangement's backup pad, the backup pad 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 swing frame sets up between two backup pads.

3. A swivel chair tray according to claim 1, wherein: the support include the backup pad of a level setting, the backup pad links to each other with the curb plate fixed of base, correspond on backup pad and the bottom plate of base set up with first round pin axle complex shaft hole, the swing frame sets up between backup pad and the bottom plate of base.

4. A swivel chair tray according to claim 1, wherein: the whole swing frame is L-shaped.

5. A swivel chair tray according to claim 4, wherein: the swing frame 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 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.

6. A swivel chair tray according to claim 5, wherein: 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.

7. A swivel chair tray according to claim 1, wherein: the lower end of the driving frame is provided with a third pin shaft for pushing the swinging frame, and the left end and the right end of the third pin shaft are rotationally connected with the driving frame.

8. A swivel chair tray according to claim 7, wherein: and a shaft sleeve is rotatably sleeved on the third pin shaft.

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

10. A swivel chair tray according to claim 9, wherein: the swinging frame comprises two triangular plates which are arranged in parallel and symmetrical mode, the plane where the triangular plates are located is parallel to the plane where the bottom plate of the base is located, 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.

11. A swivel chair tray according to claim 10, wherein: 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.

12. A swivel chair tray according to claim 11, wherein: the lower end of the driving frame is provided with a third pin shaft for pushing the stress block, and the left end and the right end of the third pin shaft are rotationally connected with the driving frame.

13. A swivel chair tray according to claim 12, wherein: and a shaft sleeve is rotatably sleeved on the third pin shaft.

14. A swivel chair tray according to claim 1, wherein: a second pin shaft is arranged at the other end of the swinging frame, and a stress block is rotatably sleeved on the second pin shaft; a third pin shaft for pushing the swing frame is arranged at the lower end of the driving frame, and a pushing block matched with the stress block is rotatably sleeved on the third pin shaft; a ball is arranged between the push block and the stress block, two sides of the ball are respectively contacted with the push block and the stress block all the time, and the ball keeps a gap between the push block and the stress block.

15. A swivel chair tray as claimed in claim 14, wherein: the bearing block is provided with a bearing surface, the pushing block is provided with a force application surface, arc grooves are respectively arranged on the bearing surface and the force application surface, partial arc surfaces on two sides of the ball are respectively clamped in the two arc grooves, and the maximum depth of the two arc grooves is smaller than the radius of the ball.

16. A swivel chair tray as claimed in claim 14, wherein: the round ball is a metal ball with a smooth outer surface.

17. A swivel chair tray as claimed in claim 14, wherein: the third pin shaft and the second pin shaft are vertically arranged.

18. 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.

19. 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.

20. A swivel chair tray according to claim 19, 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.

21. A swivel chair tray as claimed in claim 20, 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.

22. 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.

23. A swivel chair tray according to claim 1, wherein: the front part of the seesaw is obliquely provided with a base plate, one end of the driving frame is welded and fixed with the base plate, and the other end of the driving frame extends into the base.

24. A swivel chair tray according to claim 4, wherein: the center of the base is provided with an air rod jack for inserting an air rod, the swinging frame is arranged around the air rod jack, the center of the base is taken as a boundary, the hinge joint of the swinging frame and the base and the springs 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.

25. A swivel chair tray according to claim 1, wherein: the seesaw is connected with the rear end of the bracket: the rear end of the bracket is transversely provided with a fourth pin shaft, a waist-shaped hole is formed in the corresponding position of the rocker, and the fourth pin shaft is arranged in the waist-shaped hole of the rocker in a penetrating mode.

26. A swivel chair tray as claimed in claim 25, wherein: the bottom surface of the rear end of the bracket is welded with a transverse plate, two ends of the transverse plate are respectively bent into lug plates with shaft holes, the fourth pin shaft is a whole long shaft, the fourth pin shaft is arranged in the shaft holes of the two lug plates in a penetrating mode, and meanwhile two ends of the fourth pin shaft are inserted into the kidney-shaped holes of the warping plate.