KR20160115581A

KR20160115581A - A gas cylinder

Info

Publication number: KR20160115581A
Application number: KR1020150043541A
Authority: KR
Inventors: 안진형
Original assignee: 주식회사 삼홍사
Priority date: 2015-03-27
Filing date: 2015-03-27
Publication date: 2016-10-06

Abstract

The present invention relates to a gas cylinder. The gas cylinder according to an aspect of the present invention comprises: a vertically reciprocating spindle; a cylinder mounted inside the spindle and having the inside filled with gas; a piston for partitioning the inside of the cylinder into an upper chamber and a lower chamber; a valve part for hermetically sealing the upper end of the cylinder and including a pipe holder having a hollow part to introduce and discharge the gas and an opening and closing pin mounted through the hollow part of the pipe holder so that the gas inside the cylinder can come in and out depending on movement; and a speed varying module interposed between the valve part and the piston to adjust the amount of gas coming into and out of the hollow part. The speed varying module includes: a spring holder arranged below the pipe holder to move linearly along the inner surface of the cylinder as the lower surface of the opening and closing pin is selectively pressurized; and an elasticity part for supporting the lower surface of the spring holder and providing an elastic force to the spring holder.

Description

A gas cylinder

The present invention relates to a gas cylinder.

Generally, a gas cylinder to be applied to a chair largely consists of a base tube and a gas spindle, and the spindle of the gas cylinder is moved up and down to adjust the height of the chair seat.

1 is a cross-sectional view schematically showing a conventional gas cylinder structure.

Referring to FIG. 1, a conventional general gas cylinder 10 includes a spindle 13 connected to a seat bottom of a chair, a base tube 11 for supporting a spindle 13, a base tube 11, And a tube guide 12 interposed between the spindle 13 and the spindle 13 to prevent the spindle 13 from tilting left or right when the spindle 13 is lifted or lowered.

Specifically, the gas cylinder 10 includes a piston 23, a piston rod 22 on which the piston 23 is mounted, a piston 23 which is relatively reciprocally moved up and down in the spindle 13, And a cylinder 16 in surface contact with an O-ring mounted on the outer circumferential surface of the cylinder block 23. Here, the cylinder 16 is divided into the upper chamber 20 and the lower chamber 21 by the piston 23.

The gas cylinder 10 has a gas sealing portion 24 for sealing the lower end portion of the cylinder 16, a pipe holder 17 for sealing the upper end portion of the cylinder 16, And an open pin 14 for adjusting opening and closing of the opening and closing pin 15 by up and down movement.

Specifically, an orifice 18 for gas entry and exit is formed on one side of the pipe holder 17, and the orifice 18 is opened / closed by the opening / closing pin 15. Between the cylinder 16 and the spindle 13, a gas flow passage 19 through which the gas discharged through the orifice 18 is moved is formed.

Hereinafter, the function of the conventional gas cylinder 10 constructed as described above will be described, and a process of landing on the seat will be described as an example.

First, when the user lands on a chair and raises or lowers an operation lever (not shown) connected to the open pin 14, the open pin 14 is pressed. Then, when the open pin 14 is pressed downward, the opening and closing pin 15 is lowered. When the opening / closing pin 15 is lowered, the gas stored in the upper chamber 20 is moved to the orifice 18 along the side surface of the opening / closing pin 15. Then, the air moved to the orifice (18) is moved to the lower chamber (21) along the gas flow path (19). Then, the volume of the lower chamber 21 becomes larger than the volume of the upper chamber 20, and the spindle 13 is lowered. When the user removes the force applied to the operation lever, the movement of the gas no longer proceeds. Thus, the chair is fixed at the height desired by the user.

The height of the chair can be adjusted by the conventional gas cylinder device operated by the above-described principle. However, in the case of the conventional gas cylinder, when the open pin 14 is pressed in accordance with the adjustment of the operating lever, the spindle 13 or the piston 23 moves at a constant speed, so that the user lowers the height of the chair from the highest point to the lowest point Or, conversely, when raised from the lowermost point to the highest point, the chair height changes at a relatively slow speed, resulting in boredom.

Further, when the area of the gas channel 19 is enlarged to adjust the height of the chair more quickly, the flow of the gas is increased, so that it is difficult for the user to adjust the height of the chair to fit his or her body.

The above-described background technology is technical information that the inventor holds for the derivation of the present invention or acquired in the process of deriving the present invention, and can not necessarily be a known technology disclosed to the general public prior to the filing of the present invention.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a gas cylinder capable of changing the elevation speed through a user operation.

According to an aspect of the present invention, there is provided a spindle comprising: a vertically reciprocating spindle; A cylinder mounted inside the spindle and filled with gas; A piston which divides the inside of the cylinder into an upper chamber and a lower chamber; A valve holder having a hollow portion for sealing the upper end of the cylinder and having a hollow portion for allowing the gas to flow in and out, and an opening / closing pin mounted on the hollow portion of the pipe holder to allow gas in and out of the cylinder to move therethrough; And a speed variable module interposed between the valve portion and the piston for adjusting an amount of gas flowing into and out of the hollow portion, wherein the speed variable module is disposed below the pipe holder, A spring holder for linearly moving the inner surface of the cylinder as it is selectively pressed on the lower surface of the cylinder, and an elastic part for supporting the lower surface of the spring holder and providing an elastic force to the spring holder.

According to the present invention, the height change of the gas cylinder can be performed at various speeds through the variable speed mode, thereby increasing convenience for the user.

Further, since the elastic portion is provided on the lower surface of the spring holder to provide an elastic force, the amount of the gas flowing into the hollow portion of the opening / closing pin can be controlled in multiple stages.

1 is a cross-sectional view schematically showing a conventional gas cylinder structure;
2 is a front sectional view showing the structure of a gas cylinder according to an embodiment of the present invention;
3 is an enlarged view showing an enlarged view of a portion A in Fig.
4 is a cross-sectional view showing a state in which the opening / closing pin according to an embodiment of the present invention is moved and inserted into a recessed groove.
5 is a cross-sectional view illustrating a state in which the opening / closing pin is moved downward in a state where the opening / closing pin is inserted in the recessed groove according to an embodiment of the present invention.
6 is a front cross-sectional view of a gas cylinder showing the spindle being moved downward in an embodiment of the present invention.
7 is a sectional view for explaining a spring holder according to a second embodiment of the present invention;

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , &Lt; / RTI > equivalents, and alternatives.

FIG. 2 is a front sectional view showing the structure of a gas cylinder according to an embodiment of the present invention, and FIG. 3 is an enlarged view showing an enlarged view of part A of FIG.

2 and 3, a gas cylinder 100 according to an embodiment of the present invention includes a base tube 110, a spindle 120, a spindle guide 121, a cylinder 130, a chamber 140, (150), a valve unit (160), and a speed variable module (170).

The base tube 110 constitutes the main body of the gas cylinder 100. The spindle 120 is inserted into the base tube 110 to reciprocate up and down. The spindle guide 121 is interposed between the base tube 110 and the spindle 120 to support the spindle 120.

The speed variable module 170 is interposed between the piston 150 and the valve unit 160. The speed variable module 170 will be described later in detail.

Hereinafter, the components related to the reciprocating motion of the spindle 120 will be described.

The piston rod 151 is disposed inside the base tube 110 and is fixed to a fixing plate 193 located at a lower end of the base tube 110. The piston 150 is mounted on the upper end of the piston rod 151.

The cylinder 130 is mounted on the inner circumferential surface of the spindle 120 and is in surface contact with the outer circumferential surface of the piston 150. A sealing cap 180 is formed at the lower end of the cylinder 130 to prevent gas from leaking to the lower side of the cylinder 130. The sealing cap 180 includes a gas sealing 181 and a flange 182. The inside of the cylinder 130 is maintained at a constant pressure by the sealing cap 180. [

In detail, the cylinder 130 forms the gas chamber 140 having a predetermined length by the valve unit 160 and the sealing cap 180, and a gas such as nitrogen is injected into the gas chamber 140 do. The gas chamber 140 is divided by the piston 150 into an upper chamber 140a (see FIG. 5) and a lower chamber 140b (see FIG. 5). The volume of the upper chamber 140a and the volume of the lower chamber 140b are changed by the reciprocating movement of the spindle 120.

Here, the upper chamber 140a and the lower chamber 140b are maintained at a pressure higher than the atmospheric pressure. A gas flow path 131 is formed between the upper chamber 140a and the lower chamber 140b between the outer circumferential surface of the cylinder 130 and the inner circumferential surface of the spindle 120. [

A valve portion 160 is formed at the upper end of the cylinder 130 to seal the upper portion of the cylinder 130 and to control the entry and exit of the gas. The valve unit 160 includes an open pin 161, an opening and closing pin 162, a pipe holder 163, and an orifice 164.

Specifically, the pipe holder 163 seals the upper portion of the cylinder 130 and forms a hollow portion. The opening / closing pin 162 penetrates through the hollow portion of the pipe holder 163 to allow gas in and out of the cylinder 130. The open pin (161) is seated on the upper side of the opening / closing pin (162) to press the opening / closing pin (162). The orifice 164 is formed in the pipe holder 163 so that the gas filled in the cylinder 130 moves the inside of the cylinder 130 and the gas passage 131.

The opening / closing pin 162 is formed to have a larger cross-sectional area as it goes downward. The opening and closing pin 162 includes an upper portion 167 connected to the open pin 161 and a lower portion 166 forming a lower end of the opening and closing pin 162 and selectively pressing the speed varying module 170. [ And an intermediate portion 165 connecting the upper end portion 167 and the lower end portion 166. The cross-sectional area of the intermediate portion 165 is wider than the cross-sectional area of the upper end portion 167, and the cross-sectional area of the lower end portion 166 is larger than that of the upper end portion 167, Sectional area of the intermediate portion 165 is larger than the cross-sectional area of the intermediate portion 165.

A packing member 168 is provided at an inlet of the hollow portion of the pipe holder 163 in which the opening / closing pin 162 is inserted. The packing member 168 prevents gas from flowing through the hollow portion. The packing member 168 is formed so that the inner circumferential surface of the hole formed at the center corresponds approximately to the cross-sectional area of the intermediate portion 165, thereby covering the side surface of the intermediate portion 165. That is, the packing member 168 is formed into a ring shape in which the opening / closing pin 162 is inserted. The lower surface of the packing member 166 is supported by the washer, thereby fixing the packing member 166 on the inner peripheral surface of the hollow portion.

The lower end of the piston rod 151 is fixedly mounted to the lower end of the base tube 110. In detail, the lower end of the piston rod 151 is supported by a fixing plate 193 mounted on the lower end of the base tube 110. The fixing pin 195 is coupled to the lower end of the piston rod 151 to prevent the piston rod 151 from being detached from the fixing plate 193. A washer 194 is inserted between the fixing plate 193 and the fixing pin 195 and the washer 194 prevents the fixing plate 193 from being damaged by direct contact with the fixing pin 195 .

The components related to the function of varying the lifting speed of the spindle 120 will be described.

The speed variable module 170 performs a function of varying the speed of the spindle 120. The speed-dependent module 170 is provided inside the cylinder 130. The cylinder 130 is divided into the upper chamber 140a and the lower chamber 140b by the piston 150 and the speed variable module 170 is divided into the upper chamber 140a and the upper chamber 140b of the cylinder 130, 140a. Accordingly, it can be understood that the speed variable module 170 is located on the upper portion of the piston 150 or the lower portion of the valve portion 160.

The speed variable module 170 includes a spring holder 171 that forms an upper end and selectively contacts the opening and closing pin 162 from the lower side of the pipe holder 163, And a support 174 for supporting the elastic portion 173 at a lower portion of the elastic portion 173. The elastic portion 173 may be formed of a synthetic resin.

The spring holder 171 is formed such that its cross section corresponds to the inner circumferential surface shape of the cylinder 130 and its upper surface is adjacent to the pipe holder 163. A part of the upper surface of the spring holder 171 may contact a part of the lower surface of the pipe holder 163.

The upper surface of the spring holder 171 may have a depression groove 171a which is depressed downward so that the lower end portion 166 of the opening / closing pin 162 is inserted into the center of the upper surface of the spring holder 171. To this end, the lower end 166 of the opening / closing pin 162 and the end surface of the depression groove 171a may be formed to correspond to each other. Accordingly, when the opening / closing pin 162 is lowered by a user's operation, the lower end portion 166 of the opening / closing pin 162 is inserted into the recessed groove 171a or inserted into the recessed groove 171a, The pin 162 can lower the above-described spring holder 171.

The spring holder 171 may be spaced apart from the inner circumferential surface of the cylinder 130 or the lower surface of the pipe holder 163. The gas in the upper chamber 140a can be moved upward or downward of the velocity variable module 170 through the gap S, That is, the gap S formed between the spring holder 171 and the pipe holder 163 is a flow path for flowing gas into the upper chamber 140a or flowing out the gas to the lower chamber 140b .

The upper surface of the elastic portion 173 contacts the lower surface of the spring holder 171 to support the spring holder 171. The elastic portion 173 is a structure for providing an elastic force, and may include a spring. The elastic portion 173 may be disposed between the spring holder 171 and the support portion 174 or the speed variable module 170 may be formed as a tube so that the elastic portion 173 may be formed in the inner space 173 of the tube. (173).

Accordingly, when the spring holder 171 is continuously pushed in the state where the opening / closing pin 162 is fitted in the recess 171a, the spring holder 171 is lowered and the elastic portion 173 is compressed . When the opening / closing pin 162 is restored to its original position, the spring holder 171 is lifted by the elastic force of the elastic portion 173.

The support portion 174 is provided at a lower portion of the elastic portion 173 to support the lower surface of the elastic portion 173. The supporting portion 174 may have a hole 174a penetrating the upper surface from the lower surface and the gas of the upper chamber 140a may flow through the hole 174a.

On the other hand, the inner circumferential surface of the gas chamber 140 may have a locking protrusion 175 protruding such that a part of the inner circumferential surface of the inner circumferential surface is narrowed. The latching protrusion 175 may be formed to be circumferentially reduced at a certain point of the upper chamber 140a to support a part of the lower surface of the support portion 174. [ That is, the latching jaws 175 can form EM (embossing) with a constant circular shape. Accordingly, even if the speed variable module 170 is pushed downward by the opening / closing pin 162, the speed variable module 170 can be moved downward in the gas chamber 140 by the engagement protrusions 175 that support the lower surface of the support portion 174, Is fixed.

Hereinafter, the operation principle of the gas cylinder 100 related to the change in the elevation speed of the gas cylinder 100 will be described.

FIG. 4 is a cross-sectional view illustrating a state where the opening / closing pin according to the embodiment of the present invention is moved and inserted into the recessed groove, FIG. 5 is a cross- FIG. 6 is a front cross-sectional view of a gas cylinder showing a state in which the spindle is moved downward in an embodiment of the present invention.

4 to 6, when the user sits on a chair, the spindle 120 is slightly lowered by a load corresponding to the weight of the user. At this time, the volume of the upper chamber 140a decreases and the gas pressure inside the cylinder 130 increases. That is, the pressure formed inside the cylinder 130 and the load applied to the upper chamber 140a are applied to the upper chamber 140a before the user sits on the chair.

When the operating lever (not shown) connected to the open pin 161 is pressed or raised, the open pin 161 is lowered. Since the open pin 161 maintains contact with the open / close pin 162, the open / close pin 162 also descends due to the lowering of the open pin 161. The opening / closing pin 162 closes the orifice 164 connected to the inside of the cylinder 130 before the operation lever is operated, and the opening / The orifices 164 are connected.

The orifice 164 is connected to the gas passage 131. The pressurized gas in the upper chamber 140a passes through the orifice 164 and the gas passage 131 and flows into the lower chamber 140b, . At this time, the volume of the upper chamber 140a decreases and the volume of the lower chamber 140b increases, so that the spindle 120 and the cylinder 130 are lowered. Through the above process, the height of the gas cylinder 100 can be reduced. When the user stops operating the operation lever, the height of the gas cylinder 100 can be fixed by closing the gas channel 131.

At this time, the lower end 166 of the opening / closing pin 162 is seated in the recess 171a by the lowering of the opening / closing pin 162 as shown in FIG. Accordingly, the user can feel that the lower end 166 of the opening / closing pin 162 is seated in the depression groove 171 by touching or sounding. The orifice 164 is connected to the gas passage 131. The pressurized gas of the upper chamber 140a is moved upward from the lower portion of the speed variable module 170, And flows into the lower chamber 140b through the gas channel 131. [ At this time, the volume of the upper chamber 140a decreases and the volume of the lower chamber 140b increases, so that the spindle 120 and the cylinder 130 descend.

When the user raises or lowers the operation lever more strongly, the open pin 161 and the opening and closing pin 162 are further lowered. Accordingly, as shown in FIG. 4, the opening / closing pin 162 pushes the spring holder 171 downward, and the distance between the pipe holder 163 and the spring holder 171 is increased.

As a result, a larger amount of gas flows from the upper chamber 140a to the lower chamber 140b and thereby the spindle 120 and the cylinder 130 ) Is lowered.

In other words, a state in which the opening / closing pin 162 is seated in the recessed groove 171a by a user operation is referred to as a first state, and when the opening / closing pin 162 is seated in the recessed recess 171a, In the second state, when the spring holder 171 is pushed downward, the second state is a downward movement of the opening / closing pin 162 to form a wider gas flow space in the first state. Therefore, in the first state, a larger amount of gas can flow from the upper chamber 140a to the lower chamber 140b, thereby lowering the descending speed of the spindle 120 and the cylinder 130 have.

That is, in the first state, the packing member 168 surrounding the side surface of the opening / closing pin 162 encloses between the intermediate portion 165 and the upper end portion 167 of the opening / closing pin 162 having a relatively wide cross- The amount of gas flowing into the orifice 164 through the hollow portion of the pipe holder 163 is relatively small. However, in the second state, the packing member 168 surrounding the side surface of the opening / closing pin 162 surrounds the upper end portion 167 having a relatively narrow cross-sectional area due to the descent of the opening / closing pin 162, And the opening / closing pin 162, so that a large amount of gas can be introduced into the orifice 164.

Accordingly, the user can control the operation lever in multiple stages such as the first state and the second state, and adjust the moving speed of the spindle 120 and the cylinder 130 by the multi-stage steering to adjust the height of the chair to the user's intention There is an advantage that it can be changed appropriately.

On the other hand, when the user finishes the operation lever operation, the height of the gas cylinder 100 is fixed. Then, the opening / closing pin 162 is raised to an original position, and the spring holder 171 is also elevated by the elastic force of the elastic portion 173. When the height of the gas cylinder 100 is increased, the operating lever is pulled upward in a pressurized state. Through the above operation, the gas in the lower chamber 140b flows into the upper chamber 140a, And the spindle 120 and the cylinder 130 are moved upward.

7 is a cross-sectional view illustrating a spring holder according to a second embodiment of the present invention.

The present embodiment is the same as the first embodiment in the other portions, but differs in the spring holder. Therefore, only the characteristic parts of the present embodiment will be described below, and the same parts as those of the first embodiment will be referred to as the first embodiment.

Referring to FIG. 6, a flow hole 177 may be formed in the spring holder 171 to pass from the upper surface to the lower surface. The flow holes 177 are formed in such a manner that the gas in the upper chamber 140a is moved to the upper portion of the spring holder 171 or the gas introduced in the lower chamber 140a through the orifice 164 flows into the upper chamber 140a And is understood as a gas flow hole passing through the spring holder 171. [

Therefore, in this embodiment, in addition to the gap formed between the spring holder 171 and the pipe holder 163, the gas in the upper chamber 140a passes through the flow hole 177, And may be introduced into the opphea 164.

Claims

A spindle reciprocating up and down;
A cylinder mounted inside the spindle and filled with gas;
A piston which divides the inside of the cylinder into an upper chamber and a lower chamber;
A valve holder having a hollow portion for sealing the upper end of the cylinder and having a hollow portion for allowing the gas to flow in and out, and an opening / closing pin mounted on the hollow portion of the pipe holder to allow gas in and out of the cylinder to move therethrough; And
And a speed variable module interposed between the valve and the piston to adjust the amount of gas flowing into and out of the hollow portion,
The speed variable module includes:
A spring holder disposed on the lower side of the pipe holder for linearly moving the inner surface of the cylinder as it is selectively pressed on the lower surface of the opening and closing pin, and an elastic portion for supporting the lower surface of the spring holder and providing an elastic force to the spring holder Gas cylinder.

The method according to claim 1,
Wherein the cross-sectional area of the opening / closing pin increases toward the lower side.

3. The method of claim 2,
In the hollow portion of the pipe holder,
And a packing member provided to surround a side surface of the opening and closing pin and gripping the gas flowing through the hollow portion.

The method of claim 3,
When the opening / closing pin is moved downward,
Wherein a cross sectional area of the opening / closing pin contacting the packing member is narrowed to increase the amount of gas flowing into the hollow portion.

The method according to claim 1,
Between the pipe holder and the spring holder,
And a flow path is formed to allow gas to flow into or out of the upper chamber.

6. The method of claim 5,
Wherein when the opening / closing pin presses the spring holder downward, the flow path is expanded to increase the amount of gas flowing into the hollow portion.

In the first aspect,
The speed variable module includes:
And a support portion supporting the elastic portion at a lower portion of the elastic portion,
On the inner peripheral surface of the cylinder,
And a latching protrusion protruding from the inner circumferential surface is formed to engage with the lower surface of the support portion.

The method according to claim 1,
Wherein the elastic portion is a spring or a rubber.

The method according to claim 1,
In the spring holder,
And a flow hole is formed through the lower surface from the upper surface so that the gas flows.

The method according to claim 1,
On the upper surface of the spring holder,
And a depressed groove recessed downward is formed to selectively fit the lower end of the opening / closing pin.