KR102641792B1 - Gas cushion cylinder - Google Patents

Abstract

In the present invention, a spindle that is raised and lowered according to the movement of gas in a base tube, a barrel that is equipped with a port for gas movement inside the spindle, and the inner space is filled with gas, and a piston installed vertically in the lower part of the base tube A piston is inserted into the inside of the barrel by a rod to separate the inside of the barrel into two gas chambers, is mounted on the top of the barrel, has guide holes drilled up and down in the center, and the guide hole and the port are connected. A valve body with an orifice formed thereon, a release pin inserted into a guide hole of the valve body and opening and closing the orifice, mounted at the bottom of the barrel within the spindle, blocking the gap between the barrel and the piston rod and the spindle. A rod guide that guides the lifting and lowering of the piston and the valve body, and controls the moving speed of the gas moving through the guide hole and the orifice by changing the gap with the valve body according to the lifting and lowering of the spindle. A speed guide, a first spring inserted between the piston and the speed guide to provide elastic force to maintain the gap between the piston and the speed guide, and a top of the speed guide, which protects against shock when the speed guide contacts the valve body. Disclosed is a gas cushion cylinder including a second spring that provides elastic force for relaxation.

Description

Gas cushion cylinder {GAS CUSHION CYLINDER}

The present invention relates to a gas cylinder used as a pressure damper for a chair. More specifically, the spindle is located at the lowest point during the downward stroke within the base tube to alleviate the impact force when colliding, and when used for a long period of time, the metal inside is This relates to a gas cushion cylinder that prevents the generation of foreign substances due to friction between livers.

Generally, a gas cylinder is installed between the seat and the base (legs) of a chair to adjust the height of the seat or relieve shock by obtaining a repulsive force from the gas pressure injected at high pressure.

As shown in FIG. 1, this gas cylinder includes a base tube 11 mounted on a chair leg, a spindle 13 that moves up and down within the base tube 11 as the gas moves and adjusts the height of the seat, and a base. A guide bush (12) is mounted between the tube (11) and the spindle (13) to guide the spindle (13) to move up and down smoothly without tilting left or right, and to prevent leakage of lubricant, and is mounted inside the spindle (13). a barrel 16 filled with gas, a piston rod 22 fixed to the lower part of the base tube 11, and a piston rod 22 mounted on the top of the piston rod 22 and inserted into the barrel 16 to produce two gases. It consists of a piston (23) that separates into chambers.

Additionally, a valve body 17 is mounted on the upper end of the barrel 16, and a rod guide 24 is mounted on the lower end. A release pin 15 is inserted into the center of the valve body 17, and a release pin 15 is installed on the spindle 13. A push button (14) is installed at the top to press and press the release pin (15).

In addition, an orifice 18 is formed on one side of the valve body 17 to open and close as the release pin 15 rises, and the gas discharged through the orifice 18 is between the barrel 16 and the spindle 13. A port 19 is formed, which is a flow path through which .

In addition, a damper 25 is installed in the lower part of the base tube 11 to absorb the shock when the spindle 13 is lowered.

Therefore, when the user presses the push button (14) down with a separate operating lever, the release pin (15) moves down, the orifice (18) of the valve body (17) opens, and the gas stored in the lower gas chamber of the barrel (16) is released. It moves to the upper gas chamber of the barrel (16) through the port (19) and orifice (18), and when this happens, the lower end of the piston rod (22) is fixed to the lower part of the base tube (11), increasing the volume of the upper gas chamber. Since it is relatively larger than the volume of the lower gas chamber, the spindle 13 moves upward due to the reaction.

On the contrary, when the user presses the push button (14) downward with a separate operating lever while sitting on a chair, the release pin (15) descends and the orifice (18) of the valve body (17) opens, and the user's own weight The spindle 13 moves down.

That is, the gas stored in the upper gas chamber of the barrel 16 based on the piston 23 moves to the lower gas chamber of the barrel 16 through the orifice 18 and the port 19, thereby increasing the volume of the lower gas chamber. Since it becomes larger than the volume of the upper gas chamber, the spindle 13 moves down.

At this time, when the user removes the force applied to the operating lever, the release pin 15 rises and closes the orifice 18 of the valve body 17, so the gas does not move and the spindle 13 is fixed at a certain height.

However, this means that when the user sits on the seat while the chair's seat is manipulated to the bottom dead center position, that is, the spindle (13) is located at the lowest point during the downward stroke within the base tube (11), the lower end of the spindle (13) There was a problem in that noise and shock were generated when the damper 25 was hit hard and momentarily.

To solve this problem, Patent Document 1 discloses a gas spring for speed control.

However, this had the problem of moving up and down or shaking when the spindle was located at the lowest point during the downward stroke within the base tube.

In addition, when used for a long period of time, there was a problem that foreign substances were generated due to frequent contact and friction between the inner circumferential surface of the barrel and the metal spring for maintaining the gap.

The background or prior art described above herein is information possessed by the present inventor or acquired in the process of deriving and completing the present invention, and is helpful in understanding the technical significance of the present invention and useful for prior art search and examination. It is to be noted that this does not mean that the reference numerals in the prior art are generally known and widely used in the technical field to which the present invention belongs prior to the filing of the present invention, and that the reference numerals in the prior art are unrelated to the reference numerals in the present invention. .

KR 10-1035016 B1(2011. 05. 09.) KR 10-1396236 B1(2014. 05. 12.) KR 10-2016-0115581 A(2016. 10. 06.)

Accordingly, the present inventor comprehensively considered all of the above-mentioned matters, and at the same time, with the idea of solving the technical limitations and problems of existing gas cylinder technology, the present inventor located the spindle at the lowest point during the downward stroke within the base tube, so that when it collides, As a result of continuous research to develop a gas cushion cylinder with a new structure that can relieve impact force and prevent the generation of foreign substances due to friction between metals inside during long-term use, the present invention was developed. was created.

Therefore, the technical problem and purpose to be solved by the present invention is to provide a gas cushion cylinder that can alleviate the impact force generated during the downward stroke of the spindle.

Another technical problem and purpose to be solved by the present invention is to provide a gas cushion cylinder that prevents the generation of foreign substances due to friction between internal metals during the lifting process of the spindle.

Here, the technical problems and objectives to be solved by the present invention are not limited to the technical problems and objectives mentioned above, and other technical problems and objectives not mentioned can be understood from the description below as a matter of common knowledge in the technical field to which the present invention pertains. Those who have it will be able to understand it clearly.

A specific means according to an aspect of the present invention for effectively achieving a specific technical purpose while embodying a new idea for solving the technical problem of the present invention as described above is a base tube, a gas inside the base tube, A spindle that is raised and lowered according to the movement of the spindle and has a push button installed at the top, a barrel equipped with a port for gas movement inside the spindle and filling the inner space with gas, and a piston rod installed vertically in the lower part of the base tube. A piston is inserted into the inside of the barrel and separates the inside of the barrel into two gas chambers, is mounted on the top of the barrel within the spindle, has guide holes drilled up and down in the center, and includes the guide hole and the port. A valve body with an orifice formed to allow the valve to pass through, a release pin inserted into a guide hole of the valve body and lowered by the push button to open the orifice of the valve body, mounted at the bottom of the barrel within the spindle, A rod guide that closes the gap between the barrel and the piston rod and guides the lifting and lowering of the spindle, is inserted between the piston and the valve body in the barrel, and changes the gap with the valve body according to the lifting and lowering of the spindle. A speed guide that controls the moving speed of gas moving through the hole and the orifice, a first spring inserted between the piston in the barrel and the speed guide to provide elastic force to maintain the gap between the piston and the speed guide, and a first spring in the barrel A gas cushion cylinder is provided that is mounted on the top of the speed guide and includes a second spring that provides elastic force to alleviate shock when the speed guide contacts the valve body.

As a result, the present invention can effectively alleviate the impact force when the spindle collides with the spindle at the lowest point during its downward stroke within the base tube.

In addition, a preferred aspect of the present invention is mounted on the upper surface of the piston in the barrel, supports the lower end of the first spring to stabilize the coupling between the piston and the lower end of the first spring, and supports the spindle. It further includes a spring guide that minimizes friction between the inner circumferential surface of the barrel and the inner circumferential surface of the barrel as the first spring moves when the barrel is raised and lowered, thereby preventing the generation of foreign substances due to friction between metals inside even when used for a long period of time.

According to the technical idea and embodiment of the present invention, which is based on a unique solution to solve the above technical problems, gas through the guide hole and orifice due to a change in the gap between the valve body and the speed guide when the spindle is raised and lowered. It controls the moving speed of the second spring, and when the second spring contacts the valve body, it can gently absorb and relieve shock through elastic action.

Therefore, the impact force when the spindle is located at the lowest point during the downward stroke within the base tube and collides can be effectively alleviated.

In addition, the spring guide stably holds the first spring when the spindle is raised and lowered, minimizing friction with the inner circumferential surface of the barrel, preventing foreign substances from being generated internally due to friction between metals even when used for a long period of time. .

Here, the effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

1 is a longitudinal cross-sectional view illustrating a conventional gas cylinder.
Figure 2 is a longitudinal cross-sectional view showing a gas cushion cylinder according to an embodiment of the present invention.
Figure 3 is a longitudinal cross-sectional view showing an enlarged local portion to help understand the lifting operation state of the spindle constituting the gas cushion cylinder according to an embodiment of the present invention.
Figure 4 is a longitudinal cross-sectional view to help understand the lowering operation state of the spindle constituting the gas cushion cylinder according to an embodiment of the present invention.
Figure 5 is a longitudinal cross-sectional view showing an enlarged local portion to help understand the lowering operation state of the spindle constituting the gas cushion cylinder according to an embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described in more detail with reference to the attached drawings.

Prior to this, the terms described below are defined in consideration of their functions in the present invention, and should be interpreted as concepts consistent with the technical idea of the present invention and meanings commonly used or commonly recognized in the relevant technical field.

Additionally, if it is determined that a detailed description of a known function or configuration related to the present invention may obscure the gist of the present invention, the detailed description will be omitted.

The drawings attached herein may be shown with exaggerated or simplified portions for the purpose of the composition of the technology, explanation of the operation of the technology, convenience of understanding, clarity, etc., and each component in the drawings exactly matches the actual size and shape. I state that I am not doing this.

In addition, in this specification, the term and/or refers to a combination of a plurality of related described items or includes any item among a plurality of related described items, and when a part includes a certain element, this means that it is specifically opposed to Unless otherwise stated, it does not mean excluding other components, but rather including other components.

In other words, terms such as 'include' or 'have' used in this specification mean the existence of features, numbers, steps, processes, operations, components, parts, or a combination thereof. It should be understood that it does not exclude the presence or addition of other features, numbers, steps, processes, operations, components, parts, or combinations thereof.

Meanwhile, the meaning of “part” and “unit” used in the present invention refers to a module that plays a role or a unit that processes at least one function or certain operation desired in a device or system, which is hardware, software, or It can be implemented through a combination of hardware and software, or as a device or assembly that can perform independent operations.

In addition, terms such as top, bottom, upper surface, lower surface, or upper, lower, upper, lower, front, back, left and right used in the present invention are used for convenience to distinguish the relative positions of each component. For example, the upper part of the drawing may be referred to as upper and the lower part as lower, the longitudinal direction may be referred to as the front-to-back direction, and the width direction may be referred to as the left-right direction.

Additionally, terms such as first and second used in the present invention can be used to describe various components. In other words, terms such as first, second, etc. can be used only for the purpose of distinguishing one component from another component.

2 to 5, the gas cushion cylinder according to an embodiment of the present invention includes a base tube 100, a spindle 110, a barrel 120, a piston 130, a valve body 140, and a release pin. It includes (150), rod guide 160, speed guide 170, first spring 180, second spring 190, and spring guide 200.

The base tube 100 is formed in a cylindrical shape with an accommodating space therein.

Additionally, a guide bush 101 is inserted and installed between the top of the base tube 100 and the spindle 110 to guide and support the lifting and lowering of the spindle 110.

That is, the guide bush 101 is inserted and mounted between the spindle 110 at the top of the base tube 100 to guide the spindle 110 and move up and down smoothly without tilting left or right and to prevent leakage of lubricant.

Additionally, a bearing 102 is installed at the lower part of the base tube 100 to allow the piston rod 131 supporting the piston 130 to rotate.

Here, the base tube 100 may be formed in a cylindrical shape with an overall constant diameter or a gradually narrowing diameter toward the bottom, or a conical shape in which the upper part is a constant diameter and the lower part has a gradually decreasing diameter. However, this external shape is not limited. do not leave

The spindle 110 is formed in the shape of a hollow tube with a certain length, and its lower part is inserted into the receiving space of the base tube 100 to be raised and lowered according to the opening and closing operation of the release pin 150.

And a push button 111 is installed on the top of the spindle 110 to press the release pin 150 according to the user's intention.

That is, the spindle 110 is raised and lowered according to the movement of gases such as nitrogen within the base tube 100 according to the opening and closing operation of the push button 111 and the release pin 150 linked thereto, thereby controlling the height of the seat of the chair. Do it.

The barrel 120 is formed in the shape of a hollow tube and is inserted into the spindle 110.

And the barrel 120 is equipped with a port 121, which is a fluid passage for gas movement, between the spindle 110 and the spindle 110.

In addition, the barrel 120 is formed in the shape of a hollow tube with a certain length to fill the internal space with a gas such as nitrogen, and the upper end is controlled by the valve body 140 to maintain a pressure higher than atmospheric pressure inside the barrel 120. It is sealed, and the lower end is sealed by the rod guide 160.

That is, the barrel 120 is divided into two upper and lower gas chambers whose volumes change depending on the position of the piston 130.

The piston 130 is inserted into the barrel 120 in surface contact to separate the barrel 120 into two upper and lower gas chambers.

That is, the piston 130 is fixed to the upper end of the piston rod 131, and the lower end of the piston rod 131 is installed vertically in the lower part of the base tube 100 so that it can rotate by the bearing 102 or the like.

And a ring groove is formed on the outer circumferential surface of the piston 130, and an O-ring that closes the gap with the barrel 120 is inserted into this ring groove.

The valve body 140 is mounted on the top of the barrel 120 within the spindle 110 to seal the barrel 120 to prevent gas from leaking.

In addition, guide holes 141 are formed in the center of the valve body 140 up and down, and orifices 142 are formed on the sides to allow the guide hole 141 and the port 121 to communicate.

In addition, a socket 143 into which the upper end of the second spring 190 is inserted is formed at the edge of the guide hole 141 on the lower surface of the valve body 140, and no contact interference with the release pin 150 occurs. A plug 144 is formed that is inserted into the socket 143 and contacts the top of the second spring 190.

In addition, at least one ring groove is formed on the outer peripheral surface of the valve body 140, and an O-ring that closes the gap with the barrel 120 is inserted into this ring groove.

The release pin 150 is inserted into the guide hole 141 of the valve body 140 so as to be lowered by the push button 111 to open the orifice 142 of the valve body 140.

That is, the release pin 150 closes the orifice 142 of the valve body 140, and its upper surface is maintained in contact with the lower surface of the push button 111 and is mounted in the center of the valve body 140. .

And the release pin 150 is formed in a shape whose cross-sectional area gradually increases toward the bottom.

The rod guide 160 is mounted at the bottom of the barrel 120 within the spindle 110 to block the gap between the barrel 120 and the piston rod 131 and guide the lifting and lowering of the spindle 110.

The speed guide 170 is inserted between the piston 130 and the valve body 140 in the barrel 120.

That is, the speed guide 170 serves to control the moving speed of the gas moving through the guide hole 141 and the orifice 142 while changing the gap with the valve body 140 as the spindle 110 is raised and lowered. .

In addition, a groove is formed on the upper surface of the speed guide 170 to prevent interference with the release pin 150 when the lower end of the second spring 190 is installed and in contact with the valve body 140, and the speed guide is also formed. A groove is formed on the lower surface of (170) for inserting and supporting the upper end of the first spring (180).

The first spring 180 is compressed when the force transmitted to the speed guide 170 is applied when the spindle 110 is lifted and lowered, and when the force is removed, it is stretched by compressive stress and returns the speed guide 170 to its original position. In order to return it, it is inserted between the piston 130 and the speed guide 170 in the barrel 120.

That is, the first spring 180 serves to provide elastic force to maintain the gap between the piston 130 and the speed guide 170.

Here, the first spring 180 is preferably a compression coil spring that generates an elastic restoring force in the direction opposite to the external force, but any elastic body may be used as long as it has the same effect.

The second spring 190 is protruding and mounted on the top of the speed guide 170 within the barrel 120.

That is, the second spring 190 serves to provide elastic force to alleviate shock when the speed guide 170 contacts the valve body 140.

Here, the second spring 190 is preferably a compression coil spring that generates an elastic restoring force in the direction opposite to the external force, but any elastic body may be used as long as it has the same effect.

In addition, the elastic modulus of the second spring 190 is smaller than that of the first spring 180, so that the second spring 190 temporarily absorbs the energy caused by impact with the valve body 140. Second, the speed guide 170 contacts the valve body 140 to block the movement of gas, and the first spring 180 acts to relieve the impact.

The spring guide 200 is made of synthetic resin and is mounted on the upper surface of the piston 130 in the barrel 120.

That is, the spring guide 200 supports the lower end of the cylindrical first spring 180 to stabilize the coupling between the piston 130 and the lower end of the first spring 180, and also provides the first first spring 180 when the spindle 110 is lifted. As the spring 180 moves, it serves to minimize friction between the inner circumferential surface and the barrel 120.

In addition, a retainer 201 is formed on the upper part of the spring guide 200 and is inserted into the hollow lower part of the first spring 180, and a seat 202 is installed on the lower part so that the lower end of the first spring 180 is safely locked. ) is formed.

The main functions and operating principles of the gas cushion cylinder according to the embodiment of the present invention configured as described above are described as follows.

First, as shown in FIGS. 2 and 3, when the user presses the push button 111 downward with a separate operating lever, the release pin 150 moves down and the orifice 142 of the valve body 140 opens and the piston The gas stored in the lower part of 130, that is, in the lower gas chamber in the barrel 120, moves to the upper part of the piston 130, that is, in the upper gas chamber in the barrel 120, through the port 121 and the orifice 142, In this case, the volume of the upper gas chamber in the barrel 120 becomes larger than the volume of the lower gas chamber, and the spindle 110 moves upward due to the reaction.

On the contrary, as shown in FIGS. 4 and 5, when the user presses down on the push button 111 with a separate operating lever while sitting on a chair, the release pin 150 descends and opens into the orifice of the valve body 140. (142) is opened, and when this happens, the gas stored in the upper gas chamber within the barrel 120, i.e., the upper part of the piston 130 due to the user's weight, flows to the lower part of the piston 130 through the orifice 142 and the port 121. That is, it moves to the lower gas chamber within the barrel 120 and the volume of the lower gas chamber becomes larger than the volume of the upper gas chamber, so the spindle 110 moves down.

In this process, when the spindle 110 is located at the lowest point within the base tube 100, the second spring 190 primarily contacts the valve body 140 to gently absorb and relieve shock.

In addition, the speed guide 170 can control the moving speed of gas through the guide hole 141 and the orifice 142 by changing the gap between the speed guide 170 and the valve body 140.

Thereafter, when the speed guide 170 completely contacts the valve body 140 and blocks the movement of gas, a stop section S is generated between the lower end of the spindle 110 and the bearing 102.

In this state, when the release pin 150 rises and closes the orifice 142 of the valve body 140, the gas does not move, and the gap between the piston 130 and the speed guide 170 is closed by the first spring 180. It is possible to maintain the lowered position of the spindle 110, that is, the stopping section (S) between it and the bearing 102.

Therefore, the spindle 110 is located at the lowest point during the downward stroke within the base tube 100, so that impact force when it collides with the bearing 102, etc. can be effectively alleviated.

Moreover, the spring guide 200 minimizes friction between the first spring 180 and the inner circumferential surface of the barrel 120 by moving freely when the spindle 110 is raised and lowered, so even when used for a long period of time, friction between metals inside the spring guide 200 is minimized. It can prevent foreign substances from being generated.

As another example, a closing means may be provided so that the closed state can be maintained when the bottom of the valve body 140 and the top of the speed guide 170 come into contact.

The closing means may not only close by surface contact but also maintain a stable immersion state by attaching a pad to the corresponding surface.

Meanwhile, the present invention is not limited to the above-described embodiments and the accompanying drawings, and may be modified and applied in various ways not exemplified without departing from the technical spirit of the present invention. It is clear to those skilled in the art that the present invention can be broadly applied by replacing components and changing it to other equivalent embodiments.

Therefore, contents related to modifying and applying the technical features of the present invention should be interpreted as being included within the technical idea and scope of the present invention.

100: base tube 101: guide bush
110: spindle 111: push button
120: barrel 121: port
130: piston 131: piston rod
140: valve body 141: guide hole
142: Orifice 150: Release pin
160: Rod guide 170: Speed guide
180: 1st spring 190: 2nd spring
200: Spring guide

Claims (5)

Base tube (100); A spindle 110 that is raised and lowered according to the movement of gas within the base tube 100; A barrel 120 that is provided with a port 121 for gas movement inside the spindle 110 and whose inner space is filled with gas; A piston 130 that is inserted into the interior of the barrel 120 by a piston rod 131 installed vertically in the lower portion of the base tube 100 to separate the interior of the barrel 120 into two gas chambers; It is mounted on the top of the barrel 120 in the spindle 110, has guide holes 141 drilled in the center at the top and bottom, and has an orifice 142 that allows the guide hole 141 and the port 121 to communicate. Formed valve body 140; A release pin 150 that is inserted into the guide hole 141 of the valve body 140 so as to be able to move up and down to open and close the orifice 142; A rod guide 160 mounted at the bottom of the barrel 120 within the spindle 110, blocking the gap between the barrel 120 and the piston rod 131 and guiding the raising and lowering of the spindle 110; It is inserted between the piston 130 and the valve body 140, and passes through the guide hole 141 and the orifice 142 as the distance from the valve body 140 changes as the spindle 110 moves up and down. A speed guide (170) that controls the moving speed of the moving gas; A first spring 180 that is inserted between the piston 130 and the speed guide 170 and provides elastic force to maintain the gap between the piston 130 and the speed guide 170; and a second spring 190 mounted on the top of the speed guide 170 and providing elastic force to alleviate impact when the speed guide 170 contacts the valve body 140;
The lower end of the first spring 180 is supported on the upper surface of the piston 130 in the barrel 120 to stabilize the coupling between the piston 130 and the lower end of the first spring 180, A spring guide 200 is installed to minimize friction between the inner circumferential surface of the barrel 120 and the inner circumferential surface of the barrel 120 while the first spring 180 moves when the spindle 110 is raised and lowered, and the upper part of the spring guide 200 A retainer 201 is formed to be inserted into the hollow lower end of the first spring 180, and a sheet 202 is formed at the lower portion to catch the lower end of the first spring 180;
A socket 143 into which the upper end of the second spring 190 is inserted is formed at the edge of the guide hole 141 on the lower surface of the valve body 140, and contact interference with the release pin 150 does not occur. It is inserted into the socket 143 in an unoccupied state to form a plug 144 that contacts the top of the second spring 190;
A closing means is provided to maintain the closed state by attaching a pad to the corresponding surface so that the closed state can be maintained when the bottom of the valve body 140 and the top of the speed guide 170 are contacted;
A gas cushion cylinder, characterized in that a stopping section (S) is formed between the lower end of the spindle (110) and the bearing (102) when the speed guide (170) contacts the valve body (140).
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