KR20180044458A - The seat tilt tension adjusting hydraulic system - Google Patents

Abstract

The present invention relates to a seat back tension adjustment device. According to the present invention, the degree of rearward seat back inclination by a force can be easily adjusted depending on a user so that comfort can be maintained at all times. The seat back-mounted adjustment device is mounted in the lower portion of a chair seat back such that a restoring force acts by pressing during rearward back inclination. The chair includes: a pair of lower frames where a rotary shaft extending in a left-right direction is mounted in the lower portion of the seat front and the seat back fixed to the front end, extending rearward, and then bent upward is mounted at both ends of the rotary shaft; and a pressing piece extending rearward from the middle of the rotary shaft. The present invention is provided with a main piston extending upward through the middle of the upper surface inside, determining the inclination angle of the lower frame with the upper end in close contact with the pressing piece, and performing cushioning by an internal fluid with respect to the downward pressing force by the pressing piece. The present invention includes a hydraulic device mounted on and fixed to the lower portion of the chair.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a seat back tilt adjusting hydraulic system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair back tension control device, and more particularly, to a chair back tension control device, The present invention relates to a chair back tension control device.

In modern society, the time spent living in chairs at school, at work, and at home has increased markedly compared to the past, and consumers have preferred chairs that can provide more comfort.

The comfort that can be obtained from the chair is basically developed according to the shape of the chair, the height of the seat, the shape and the angle of the backrest are in the direction of making the correct posture without feeling fatigue, I am crazy.

On the other hand, the function of the backrest of the chair backwardly restored and restored by the force plays an important role in making the chair feel comfortable enough to be provided in the high chair.

Most of these structures are made up of elastic means and elastic means are also made of mechanical structures including springs. However, elastic or resilient members are inferior in elastic restoring force when used, and when many parts are combined, some parts There is a problem that a mechanical failure often occurs due to breakage of the battery.

In addition, there is a difference in that the user feels uneasiness when the backrest is tilted to a great extent or the user likes the backrest to be folded back much. However, the consumer has to purchase the chair considering the purchase thereof.

Korea Utility Model Registration No. 20-0388346-0000 (June 21, 2005) Korea Utility Model Registration No. 20-0256999-0000 (November 29, 2001) Korean Patent Registration No. 10-1009491-0000 (January 12, 2011) Korean Patent Registration No. 10-1473649-0000 (December 11, 2014)

SUMMARY OF THE INVENTION The present invention has been developed in order to solve the above-mentioned problems, and it is an object of the present invention to allow a user to easily adjust an angle at which a backrest of a chair is tilted backward by force, And to develop a chair back tension control device.

In order to achieve the above object, the present invention provides a seat backrest adjusting device mounted on a lower portion of a seat of a chair, which is pressed when the backrest is tilted back so that a restoring force is applied thereto;

The chair includes a pair of lower frames mounted on the lower portion of the front of the seat and extending in the left and right direction and fixed to the front ends at both ends of the rotary shaft and extending backward and then bent upwardly, A pressing piece extending rearward from a center of the rotary shaft;

And a main piston which penetrates through the center of the upper surface of the upper surface and which is in close contact with the pressing piece so as to determine an inclination angle of the lower frame and buffers by the internal fluid with respect to the downward pressing force by the pressing piece And a hydraulic device mounted and fixed to a lower portion of the chair.

In addition, the hydraulic apparatus includes a main cylinder having a main piston filled with a fluid and pressurized by a pressing piece, a pressurizing cylinder having a pressurizing piston filled with fluid and capable of being operated, and an oil tank And a first check valve connecting the main cylinder and the pressurizing cylinder so that the fluid moves only in the direction of the main cylinder in the middle, and a second check valve connecting the oil tank and the pressurizing cylinder, And a second check valve for allowing the fluid to move only in the main cylinder and the fluid passage of the main cylinder which is connected to the main cylinder and the oil tank and has an injection valve in the middle, And a third flow path for allowing the oil to flow into the oil tank.

The hydraulic device is formed in a disk shape and has a main cylinder mounting groove recessed in the shape of a circular ring on the upper surface thereof, an oil tank mounting groove recessed concentrically on the outer side of the main cylinder mounting groove, A lower housing having a plurality of fixing bars vertically arranged at regular intervals in a radial manner;

And an upper cover having a main cylinder seating groove and an oil tank seating groove symmetrical with an upper surface of the lower housing on a bottom surface thereof and having a main piston through hole vertically penetrating through the center thereof, and;

The main cylinder is formed in a cylindrical shape, and the lower end and the upper end of the main cylinder are inserted into the main cylinder mounting grooves of the lower housing and the upper lid, respectively, and the upper portion of the main piston passes through the main piston through hole of the upper lid.

The pressure cylinder has a cylindrical groove horizontally penetrating from one side of the lower housing toward the center thereof, and one side of the pressure piston is inserted;

Wherein the oil tank is formed in a cylindrical shape and the lower end and the upper end are respectively inserted into the oil tank mounting grooves of the lower housing and the upper cover;

Wherein the first flow path extends horizontally inward from the pressure cylinder and then extends to the vertical upper portion and communicates with the inside of the main cylinder mounting groove of the lower housing, the second flow path extends horizontally inward from the pressure cylinder, Wherein the first and second oil passages are connected to a space between the main cylinder seating groove and the oil tank seating groove of the lower housing, respectively, and both ends of the third oil passage are bent and vertically bent to connect the main cylinder and the oil tank, And the valve is provided with a valve bar having a pressing end in a direction in which the end of the lower end of the lower housing inserted through the second flow path is inserted by the compression coil spring.

In addition, one end of the lower housing is rotatably connected to the lower housing, the link, the pressure piston and the valve bar are sequentially formed in parallel;

Wherein an outer diameter of an end of the valve bar is formed to be gradually reduced and then extended;

And the pressure piston is rotatably connected to the link at one end so as to be rotatably connected to the link and spaced apart from the link to which the link is connected so that the pressure piston moves horizontally according to the movement, And a spring for pressing the button in a direction in which the button is protruded and a hook having one end fixed to the button and engaging with the latch portion of the valve bar when the button is pushed after penetrating in the longitudinal direction, And a lever provided with a bar.

As described above, according to the present invention, when the lower frame connecting and supporting the backrest is tilted backward by an external force acting on the backrest, the pressing member is made to have an elastic restoring force by the hydraulic device while adjusting the height of the main piston of the hydraulic device, It is possible to adjust the degree of relieving the impact by the inclination and the hydraulic pressure, and thus it is possible to make the user feel the optimum comfort.

Figure 1 is a perspective view of an embodiment of the present invention.
Figure 2 is a bottom perspective view of an embodiment of the present invention.
3 is a side view showing a state in which the main piston is lifted according to an embodiment of the present invention
4 is a side view illustrating a state in which the main piston is lowered according to an embodiment of the present invention.
5 is a conceptual view showing a main piston lifting structure of a hydraulic device according to an embodiment of the present invention.
6 is a conceptual view illustrating a main piston descending structure of a hydraulic device according to an embodiment of the present invention.
7 is a perspective view illustrating a hydraulic apparatus according to an embodiment of the present invention.
8 is an exploded perspective view showing a hydraulic device according to an embodiment of the present invention.
9 is a plan view showing a hydraulic device according to an embodiment of the present invention.
10 is a plan view showing a state in which the main piston is lowered according to an embodiment of the present invention.
11 is a side sectional view showing a state in which the main piston is lowered according to an embodiment of the present invention;
12 is a plan view showing a state in which a fluid is injected into a pressure piston according to an embodiment of the present invention.
13 is a side sectional view showing a state where a fluid is injected into a pressure piston according to an embodiment of the present invention
FIG. 14 is a cross-sectional view of the main piston according to an embodiment of the present invention,
15 is a side cross-sectional view showing a lifting operation state of the main piston according to an embodiment of the present invention.
16 is a plan view showing an ejector connected state according to an embodiment of the present invention.
17 is a plan view showing the descent of the main piston by the ejector according to the embodiment of the present invention.
18 is a side sectional view showing the descent of the main piston by the ejector according to the embodiment of the present invention

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is a bottom perspective view according to an embodiment of the present invention, FIG. 3 is a side view illustrating a state in which a main piston is lifted according to an embodiment of the present invention, FIG. 4 is a side view showing a state in which the main piston is lowered according to an embodiment of the present invention, and is mounted on the lower portion of the seat 11 of the chair 1 so that when the backrest 12 is tilted backward, Said chair backrest mounting adjustment device comprising:

The chair 1 is mounted on a lower portion of the front of the seat 11 with a rotary shaft 13 extending in the left and right direction and fixed to both ends of the rotary shaft 13 at its front ends, A pair of lower frames 14 on which a backrest 12 of the rotary shaft 1 is mounted and a pressing piece 15 extending rearward from the center of the rotary shaft 13;

And an upper end thereof is in close contact with the pressing piece 15 to determine an inclining angle of the lower frame 14 and a buffering force due to the internal fluid is applied to the downward pressing force by the pressing piece 15. [ And a hydraulic device (2) mounted on a lower portion of the chair (1) with a main piston (211) for allowing the chair (1) to perform a chair back tension control.

In the present invention, the restoring force of the backrest 12 to the back has been previously applied to the frame itself such as the lower frame 14 of the present invention or by using a tension spring or the like in the same structure as the rotary shaft 13 of the present invention The elastic restoring force is imparted by the hydraulic device 2 serving as a kind of hydraulic spring.

This method is problematic in that when the chair is used for many years, the backrest 12 is strongly bent backward or the elastic restoring force acting on the backrest is weakened As shown in FIGS. 3 to 4, the hydraulic device 2 can be more conveniently used by adjusting the height of the main piston 211 so as to adjust the inclination angle of the backrest 12 Reference numeral 27 denotes a structure that allows the height of the main piston 211 of the hydraulic device 2 to be adjusted by the lever 27.

FIG. 5 is a conceptual view showing a main piston lifting structure of a hydraulic device according to an embodiment of the present invention, FIG. 6 is a conceptual view showing a main piston lifting structure of a hydraulic device according to an embodiment of the present invention, 2 includes a main cylinder 21 having a main piston 211 filled with a fluid and pressurized by a pressing piece 15 and a pressurizing piston 221 having a pressurizing piston 221 filled with a fluid A first check valve 22 connecting the main cylinder 21 and the pressurizing cylinder 22 so as to move the fluid only in the direction of the main cylinder 21 in the middle of the cylinder 22, the oil tank 23 filled with the fluid, A second check valve 242 for connecting the oil tank 23 and the pressurizing cylinder 22 and allowing the fluid to move only in the direction of the pressurizing cylinder 22, 243, and a second flow path 244 having a main cylinder 21, The fluid of the main cylinder 21 which receives the pressing force by the pressing piece 15 is moved to the oil tank 23 when the inlet valve 245 is opened, And a third flow path (246) for allowing the fluid to flow therethrough.

With this configuration, in order to raise the main piston 211, when the pressure piston 22 is pulled and the fluid in the oil tank 23 is drawn and then the pressure piston 22 is pushed, the fluid moves to the main cylinder 21, 211).

Conversely, in order to lower the main piston 211, the fluid of the main cylinder 21, which is opened by the pushing piece 15 by opening the eject valve 245, moves to the oil tank 23, The height is lowered.

According to this structure, the present invention has the function of adjusting the height of the main piston 211 to adjust the inclination of the backrest, and adjusting the elastic restoring force by adjusting the amount of fluid in the main piston 211.

FIG. 7 is a perspective view of a hydraulic device according to an embodiment of the present invention, FIG. 8 is an exploded perspective view illustrating a hydraulic device according to an embodiment of the present invention, FIG. 9 is a cross- The hydraulic device 2 is formed in a disc shape and has a main cylinder seating groove 251 which is recessed in the shape of a circular ring on the upper surface thereof and a concentric circular groove 251 which is formed outside the main cylinder seating groove 251 A lower housing (25) having an oil tank mounting groove (252) which is recessed and a fixing bar (253) radially arranged at a predetermined interval in a radial direction outside the oil tank mounting groove (252);

A main cylinder mounting groove 251 and an oil tank mounting groove 252 are formed on the bottom surface of the lower housing 25 so as to be symmetrical with the upper surface of the lower housing 25, and a main piston through hole 261, And an upper lid (26) to which the upper surface and the lower surface of the lid (253) are engaged and fixed;

The main cylinder 21 is formed in a cylindrical shape and the lower end and the upper end of the main cylinder 21 are respectively inserted into the main cylinder seating grooves 251 of the lower housing 25 and the upper lid 26, Penetrates the main piston through hole (261) of the upper cover (26);

The pressure cylinder 22 has a cylindrical groove horizontally penetrating from one side of the lower housing 25 to the center thereof, and one side of the pressure piston 221 is inserted;

The oil tank 23 is formed in a cylindrical shape and has a structure in which the lower end and the upper end are respectively inserted into the oil tank mounting grooves 252 of the lower housing 25 and the upper lid 26.

At this time, sealing is inserted into the main cylinder seating groove 251 and the oil tank seating groove 252 so that the airtightness can be increased. In the structure of the present invention, the center main cylinder 21 is located, 23) to simplify the configuration.

FIG. 10 is a cross-sectional view illustrating a state in which the main piston is lowered according to an embodiment of the present invention, FIG. 11 is a side sectional view showing a state in which the main piston is lowered according to an embodiment of the present invention, FIG. 13 is a side cross-sectional view illustrating a state in which a fluid is injected into a pressure piston according to an embodiment of the present invention, and FIG. 13 is a cross-sectional view illustrating a state where a fluid is injected into a pressure piston according to an embodiment of the present invention. The upper cylinder 244 extends horizontally inward from the pressurizing cylinder 22 and extends to a vertical upper portion so as to communicate with a space between the main cylinder seating groove 251 of the lower housing 25 and the oil tank seating groove 252 ;

One end of which is rotatably connected to the lower housing 25, the link 271, the pressure piston 221 and the valve bar 245b are sequentially formed in parallel;

The pressure piston 221 is rotatably connected to the link 271 at one end thereof so as to be rotatably connected to the link 271 and spaced apart from the link 271 to which the link 271 is connected, And a lever (27) for moving the lever (27).

12, when the lever 27 is operated as shown in FIG. 12, the fluid in the oil tank 23 moves and moves into the interior of the pressure cylinder 22 in order to inject the fluid in a state where the main piston 211 descends. .

FIG. 14 is a cross-sectional view illustrating the upward movement of the main piston according to the embodiment of the present invention, FIG. 15 is a side cross-sectional view illustrating the upward movement of the main piston according to an embodiment of the present invention, The lever 27 has a structure that horizontally extends inward from the pressurizing cylinder 22 and then extends to a vertical upper portion and communicates with the inside of the main cylinder seating groove 251 of the lower housing 25. The lever 27, The fluid that has moved from the oil tank 23 to the pressurizing cylinder 22 moves to the main cylinder 21 and lifts the main piston 211.

In this case, the check valve of the present invention has a structure that forms a sphere and has a structure that flows when the fluid advances to one side and flows when the fluid advances to the other side to block the flow.

FIG. 16 is a horizontal sectional view showing an ejector connected state according to an embodiment of the present invention, FIG. 17 is a plan sectional view showing a descent of a main piston by an ejector according to an embodiment of the present invention, The third channel 245 is bent at both ends vertically to connect the main cylinder 21 and the oil tank 23 to each other. The end of the injector valve 245 inserted through the lower housing 25 is connected to the valve bar 245b having a pressing force in a direction of closing the second flow path 245 and being inserted by the compression coil spring 245a .

That is, normally, the valve bar 245b artificially releases the valve bar 245b while the third flow path 245 is blocked by the compression coil spring 245a, so that the third flow path 245 is opened.

In this case, the outer diameter of the end of the valve bar 245b is formed to be gradually reduced and then extended to form an engaging portion 245c;

A button 272 protruding to the opposite side end of the link 271 and a spring 273 urging the button 272 in a direction in which the button 272 protrudes and one end fixed to the button 272, And a connecting bar 275 having an engaging hole 274 for engaging with the engaging portion 245c of the valve bar 245b when the button 272 is pushed after passing through Specific embodiments are provided.

The lever 27 which functions as a pump for operating the pressurizing cylinder 22 to supply fluid to the main cylinder 21 presses the button 272 and the connecting bar 275 is connected to the latching portion 245c When the lever 27 is pulled, the valve bar 245b is pulled so that the fluid of the main cylinder 21, which is pressurized by the pressing piece 15, moves to the oil tank 23 and the height of the main piston 211 .

1: Chair
11: Seat 12: Backrest
13: rotating shaft 14: lower frame
15:
2: Hydraulic device
21: Main cylinder
211: Main piston
22: Pressure cylinder
221: pressure piston
23: Oil tank
241: first check valve 242: first flow path
243: second check valve 244: second flow passage
245: an inject valve 245a: a compression coil spring
245b: valve bar 245c:
246: Third Euro
25: Lower housing
251: Main cylinder seat groove 252: Oil tank seat groove
253: Fixed bar
26: upper cover
261: Main piston through hole
27: Lever
271: Link 272: Button
273: spring 274: latching hole
275: Connection bar

Claims (4)

A seat backrest adjusting device (1) mounted on a lower portion of a seat (11) of a chair (1) so that a restoring force is applied when the backrest (12) is tilted backward;
The chair 1 is mounted on a lower portion of the front of the seat 11 with a rotary shaft 13 extending in the left and right direction and fixed to both ends of the rotary shaft 13 at its front ends, A pair of lower frames 14 on which a backrest 12 of the rotary shaft 1 is mounted and a pressing piece 15 extending rearward from the center of the rotary shaft 13;
And an upper end thereof is in close contact with the pressing piece 15 to determine an inclining angle of the lower frame 14 and a buffering force due to the internal fluid is applied to the downward pressing force by the pressing piece 15. [ And a hydraulic device (2) mounted and fixed to a lower portion of the chair (1) with a main piston (211) for allowing the main piston (211) to be engaged with the main piston (211).
The fluid pressure device according to claim 1, wherein the hydraulic device (2) comprises a main cylinder (21) having a main piston (211) filled with fluid and pressurized by a pressure piece (15) The main cylinder 21 and the pressurizing cylinder 22 are connected to each other with a pressurizing cylinder 22 having a pressurizing piston 221 as an example as possible, an oil tank 23 filled with a fluid, And a first check valve 241 for allowing the fluid to move only in the direction of the pressure cylinder 22 in the middle of the oil tank 23 and the pressure cylinder 22, A second oil passage 244 having a second check valve 243 for allowing the fluid to move and a second oil passage 244 connecting the main cylinder 21 and the oil tank 23, When the valve 245 is opened, the fluid in the main cylinder 21, which is pressed by the pressing piece 15, is moved to the oil tank 23 The chair back tension control device characterized in that configured to include a third flow path (246).
The hydraulic cylinder (1) according to claim 2, wherein the hydraulic device (2) is formed in a disk shape and has a main cylinder seating groove (251) recessed in the shape of a circular ring on the upper surface thereof, A lower housing (25) having an oil tank mounting groove (252) which is recessed and a fixing bar (253) radially arranged at a predetermined interval in a radial direction outside the oil tank mounting groove (252);
A main cylinder mounting groove 251 and an oil tank mounting groove 252 are formed on the bottom surface of the lower housing 25 so as to be symmetrical with the upper surface of the lower housing 25, and a main piston through hole 261, And an upper lid (26) to which the upper surface and the lower surface of the lid (253) are engaged and fixed;
The main cylinder 21 is formed in a cylindrical shape and the lower end and the upper end of the main cylinder 21 are respectively inserted into the main cylinder seating grooves 251 of the lower housing 25 and the upper lid 26, Penetrates the main piston through hole (261) of the upper cover (26);
The pressure cylinder 22 has a cylindrical groove horizontally penetrating from one side of the lower housing 25 to the center thereof, and one side of the pressure piston 221 is inserted;
The oil tank 23 is formed in a cylindrical shape and the lower end and the upper end thereof are respectively inserted into the oil tank mounting grooves 252 of the lower housing 25 and the upper lid 26;
The first flow path 242 extends horizontally inward from the pressurizing cylinder 22 and extends to the vertical upper portion to communicate with the inside of the main cylinder receiving groove 251 of the lower housing 25, The oil passage 244 extends horizontally inward from the pressurizing cylinder 22 and extends to the vertical upper portion to communicate with the space between the main cylinder seat groove 251 of the lower housing 25 and the oil tank seat groove 252 And the third valve 245 is bent at both ends vertically to connect the main cylinder 21 and the oil tank 23 to each other and the inject valve 245 is connected to the lower housing 25 And a valve bar (245b) having a pushing force in a direction in which the one end thereof inserted through the second channel (245) is inserted by the compression coil spring (245a).
4. The apparatus of claim 3, wherein one end of the lower housing (25) is rotatably connected to the lower housing (25), a link (271), a pressure piston (221), and a valve bar (245b)
An outer diameter of an end of the valve bar 245b is formed to be gradually reduced and then extended to form an engaging portion 245c;
The pressure piston 221 is rotatably connected to the link 271 at one end thereof so as to be rotatably connected to the link 271 and spaced apart from the link 271 to which the link 271 is connected, A spring 273 for moving the button 272 in a direction in which the button 272 protrudes and a spring 273 for fixing the button 272 to one end, And a connecting bar 275 having an engaging hole 274 for engaging with the engaging portion 245c of the valve bar 245b when the button 272 is pushed after passing through in the longitudinal direction. And a seat back tension adjusting device for adjusting the tension of the chair backrest.

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