KR101516808B1 - A gas cylinder - Google Patents

Abstract

The present invention discloses a gas piston. The present invention relates to a spindle motor, comprising: a spindle reciprocating in a vertical direction; a cylinder mounted in the spindle, the cylinder being filled with gas; a piston partitioning the cylinder interior into an upper chamber and a lower chamber; And a shock absorbing portion interposed between the valve portion and the piston, wherein, when the spindle and the cylinder are lowered, the shock absorbing portion is provided at a lower portion of the shock absorbing portion So as to seal the inner space.

Description

A gas cylinder

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a gas cylinder, and more particularly, to a gas cylinder capable of relieving a shock applied to a gas cylinder when a seat is lowered so that the user can sit comfortably in the seat.

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.

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

Referring to FIG. 11, 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 conventional gas cylinder, when the user is seated in the seat with the seat at the lowermost position, the spindle 13 is brought into contact with the fixing member 25 under the base tube 11 due to the descent of the spindle 13. [ At this time, a sound and an impact are generated instantaneously, so that a noise is generated in the periphery and a shock is applied to the user. In this case, the compression section of the gas-sealing section 24 is short, and thus a shock is applied to the user, and the user is directly burdened with the burden on the user. . Further, since the cylinder 16 continuously hits the fixing member 25 due to the frequent height adjustment of the seat, the gas sealing portion 24 provided on the lower side of the cylinder 16 is easily damaged, There has been a problem that must be frequently replaced.

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.

Embodiments of the present invention aim to provide a gas cylinder in which a user can comfortably sit in a seat by forming a cushion function so as to mitigate impact applied to a gas cylinder in a certain region when the seat is lowered.

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 portion having a pipe holder which hermetically closes the upper end of the cylinder and has a hollow portion for allowing the gas to flow in and out; And a shock absorbing portion interposed between the valve portion and the piston, wherein when the spindle and the cylinder are lowered, the shock absorbing portion is configured to seal the internal space of the shock absorbing portion, do.

Here, the shock-absorbing portion may include: a holder portion interposed between the piston and the valve portion and linearly moving along the inner surface of the cylinder; And a first elastic portion supported by the piston and providing a repulsive force to the holder portion.

The guide portion may further include a guide portion interposed between the holder portion and the valve portion and guiding the holder portion for a predetermined length.

Here, when the lower side of the valve portion and the holder portion are in contact with each other, the inner space of the shock absorbing portion may be sealed.

Here, the gas accommodated in the inner space of the shock-absorbing portion may provide a repulsive force to the valve portion.

Here, the first buffer member may be disposed between the holder and the valve unit.

Here, the second buffer member may be coated on at least one of the lower surface of the pipe holder and the upper surface of the holder.

Here, the shock absorbing portion may include: a first groove formed on the inner surface of the cylinder; And a protrusion formed on the inner surface of the cylinder, the protrusion being configured to restrict a movement range of the holder in the cylinder.

Here, the shock absorbing portion may include: a second groove formed on the inner surface of the cylinder; And a second elastic part connected to the pipe holder, wherein the holder part can be connected to the second elastic part.

Here, the shock-absorbing portion may include: a third elastic portion supported by the piston and providing a repulsive force to the valve portion; And a third groove formed in the inner surface of the cylinder, wherein during the movement of the spindle and the cylinder, the gas in the cylinder passes through the third groove while the piston is passing through the third groove And may move between the upper chamber and the lower chamber.

Here, the shock-absorbing portion may include: a tapered groove having a tapered region formed along an outer circumferential surface of the holder portion; A first flow path connecting the groove and the upper chamber; And a first opening / closing part that moves along the tapered area by linear movement of the cylinder.

Here, the shock-absorbing portion may include a holder guide having a second flow path connecting the upper chamber and the lower chamber, and inserted into the holder portion; And a second opening and closing part disposed between the holder part guide and the holder part.

Here, when the holder part guide and the holder part are in close contact with each other, the second opening and closing part cuts off the second flow path, so that the inner space of the shock absorbing part can be sealed.

Here, the shock absorbing portion may include: a third opening / closing portion provided between the holder portion and the first elastic portion; A fastening part for fastening the third opening and closing part to the holder part; And a support portion connected to the first elastic portion and positioned at a lower portion of the coupling portion, and the inner space of the shock absorbing portion can be sealed by the close contact between the support portion and the third opening and closing portion.

Here, the shock-absorbing portion may include a damper portion formed to allow the gas in the cylinder to flow therein; And a first spacer located between the damper portion and the valve portion to maintain a gap between the pipe holder and the damper portion.

Here, the piston includes a tapered region formed along an outer circumferential surface of the piston to allow gas to flow into the damper portion; And a fourth opening and closing part that moves along the tapered area of the piston due to a difference between the internal pressure of the damper part and the internal pressure of the cylinder.

According to another aspect of the present invention, there is provided a spindle motor comprising: a spindle reciprocating up and down according to a height adjustment; A cylinder mounted inside the spindle and filled with gas; A piston rod disposed in the cylinder, and a piston holder configured to partition the cylinder into an upper chamber and a lower chamber; A valve portion for sealing an upper end of the cylinder; And a shock absorber having a second spacer disposed at a lower end of the piston rod and a sealing cap sealing the lower chamber, wherein the sealing cap is spaced apart from the cylinder.

Here, when the spindle and the cylinder are lowered, the second spacer supports the sealing cap, and the pressure of the gas accommodated in the upper chamber increases to provide a repulsive force to the valve unit, .

According to the present invention, a cushion function is formed in the gas cylinder when the seat is lowered, so that the user can comfortably sit on the seat.

1A and 1B are front sectional views showing the structure of a gas cylinder according to a first embodiment of the present invention.
1C is a front sectional view showing the structure of a gas cylinder according to a modification of the first embodiment of the present invention.
2 is a front sectional view showing a structure of a gas cylinder according to a second embodiment of the present invention.
3 is a front sectional view showing the structure of a gas cylinder according to a third embodiment of the present invention.
4 is a front sectional view showing a structure of a gas cylinder according to a fourth embodiment of the present invention.
5 is a front sectional view showing the structure of a gas cylinder according to a fifth embodiment of the present invention.
6 is a front sectional view showing a structure of a gas cylinder according to a sixth embodiment of the present invention.
7 is a front sectional view showing the structure of a gas cylinder according to a modification of the seventh embodiment and the seventh embodiment of the present invention.
8 is a front sectional view showing the structure of a gas cylinder according to an eighth embodiment of the present invention.
9 is a front sectional view showing the structure of a gas cylinder according to a ninth embodiment of the present invention.
10 is a front sectional view showing the structure of a gas cylinder according to a tenth embodiment of the present invention.
11 is a cross-sectional view schematically showing a conventional gas cylinder structure.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

≪ Embodiment 1 >

1A and 1B are front sectional views showing the structure of a gas cylinder 100 according to a first embodiment of the present invention. FIG. 1A shows a state in which the gas cylinder according to the first embodiment is in an elevated state, and FIG. 1B shows a state in which the gas cylinder according to the first embodiment is in a descending state to relieve impact to form a cushion function.

1A and 1B, a gas cylinder 100 according to a first embodiment of the present invention includes a base tube 110, a spindle 120, a spindle guide 121, a cylinder 130, an upper chamber 140a A lower chamber 140b, a piston 150, a valve portion 160, and an impact relieving portion 170. [

The base tube 110 constitutes the 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 shock absorbing portion 170 is interposed between the piston 150 and the valve portion 160 and includes a first elastic portion 171 and a holder portion 172. Such an impact mitigating part 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 the 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 seal 181 and a flange 182. The inside of the cylinder 130 is maintained at a constant pressure by the sealing cap 180. [

The outer wall of the cylinder 130 may form an emboss structure 183 by pressing the outer wall of the cylinder 130 so that the flange 182 is firmly fixed to the lower end of the cylinder 130.

In detail, the cylinder 130 forms a gas chamber 140 having a predetermined length by the valve portion 160 and the sealing cap 180, and a gas such as nitrogen is injected into the gas chamber 140. The gas chamber 140 is divided by the piston 150 into an upper chamber 140a and a lower chamber 140b. The volume of the upper chamber 140a and the volume of the lower chamber 140b is changed by the upward and downward 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. Between the outer peripheral surface of the cylinder 130 and the inner peripheral surface of the spindle 120, a gas flow path 131 is formed so that gas moves between the upper chamber 140a and the lower chamber 140b.

On the other hand, at an upper end of the cylinder 130, a valve portion 160 for sealing the upper portion of the cylinder 130 and controlling the entry / exit of the gas is formed. The valve portion 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 and closing pin 162 is mounted through the hollow portion of the pipe holder 163 to allow gas in and out of the cylinder 130 to enter and exit. The open pin (161) is seated on the upper side of the opening / closing pin (162) and presses 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 flow path 131.

The lower end of the piston rod 151 is fixedly mounted to the lower end of the base tube 110. 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 in detail. A fixing pin 195 is coupled to a lower end portion of the piston rod 151 so as 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.

A bearing 192 is seated on the upper side of the fixing plate 193 and an impact absorbing portion 191 is seated on the upper portion of the bearing 192. The shock absorbing portion 191 functions to mitigate the impact caused by collision of the lower portion of the spindle 120 with the bearing 192 when the spindle 120 reaches the lowest position.

Hereinafter, the components related to the shock mitigation and cushioning function of the seat of the gas cylinder 100 according to the first embodiment will be described.

The shock absorber 170 functions to mitigate an impact generated when the user contacts the base tube 110 when the spindle 120 is seated in the seat. The shock absorbing part 170 includes a first elastic part 171 forming a repulsive force and a holder part 172 transmitting a repulsive force to the valve part 160.

The holder portion 172 is interposed between the piston 150 and the valve portion 160 and can linearly move along the inner surface of the cylinder 130. The holder 172 does not interfere with the opening / closing pin 162 when the upper surface of the holder 172 contacts the valve 160, and the hollow 172a can be formed to guide the gas inside.

The hollow portion 172a may be formed on the same center as the center of the opening and closing pin 162. [ The hollow portion may have a predetermined diameter or may be formed to have a reduced diameter in the downward direction of the holder portion 172 to withstand an impact force generated when the holder portion 172 contacts the valve portion 160, It can be formed so as to be stepped by changing its size.

The first elastic part 171 may be inserted into the lower surface of the holder part 172 to form a coupling groove 173. When the first elastic part 171 is coupled to the coupling groove 173 and supported, the repulsive force generated by the first elastic part 171 can be effectively transmitted to the valve part 160.

The first elastic portion 171 is interposed between the piston 150 and the holder portion 172 and provides a repulsive force in a direction opposite to the direction of the force applied to the first elastic portion 171. The first elastic portion 171 is formed of a material generating a repulsive force and is not limited to a specific material. For example, it may be formed of silicone, rubber, wire, urethane, or a synthetic resin having elasticity. The first elastic portion 171 is formed in a shape capable of transmitting the generated repulsive force and is not limited to a specific shape. For example, a spring or a stick shape. Hereinafter, for convenience of description, a coil-shaped spring will be mainly described.

Hereinafter, the operation principle of the gas cylinder 100 related to the cushioning function and the shock mitigation of the seat of the gas cylinder 100 according to the first embodiment will be described.

When the user sits on the chair, the spindle 120 is slightly lowered due to the 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 pressure combined with the load acts on 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. Closing pin 162 of the open pin 161. Therefore, the opening-closing pin 162 also descends due to the lowering of the open pin 161. [ The opening and closing pin 162 closes the orifice 164 that is connected to the inside of the cylinder 130 and the opening and closing pin 162 is moved downward by the downward movement of the opening and closing pin 162, Lt; / RTI >

The orifice 164 is connected to the gas passage 131 so that the pressurized gas of the upper chamber 140a passes through the orifice 164 and the gas passage 131 and moves to the lower chamber 140b. At this time, the volume of the upper chamber 140a decreases, the volume of the lower chamber 140b increases, and the spindle 120 and the cylinder 130 descend.

When the spindle 120 and the cylinder 130 are lowered to a certain degree, the upper end of the holder 172 contacts the lower end of the pipe holder 163 and an impact is generated. The first elastic portion 171, to which the lower end is fixed by the piston 150, is compressed. At this time, the first elastic portion 171 generates a repulsive force corresponding to the compressive force and having the opposite direction of the force. The repulsive force generated by the first elastic portion 171 is transmitted to the holder portion 172 and the holder portion 172 transmits the valve portion 160 to the spindle 120 and the cylinder 130.

Also, the inner space s1 formed by the shock absorbing part 170 where the first elastic part 171 is located is sealed, and a repulsive force is generated by the difference in pressure between the hermetic gas and the outside. The repulsive force generated by the internal space s1 formed by the shock absorbing portion 170 is transmitted to the holder portion 172 and the holder portion 172 transmits the valve portion 160 to the spindle 120 and the cylinder (130).

That is, the shock absorbing portion 170 absorbs the impact generated by the spindle 120 and the cylinder 130, and forms a repulsive force to mitigate the impact. And also forms a cushion function for providing comfort to the user.

When the spindle 120 and the cylinder 130 descend in detail, the upper end of the holder portion 172 comes into contact with the lower end of the pipe holder 163 at the point A. At this time, the impact is generated by the momentary contact, and the impact force generated by the impact is transmitted to the first elastic portion 171. The spindle 120 and the cylinder 130 can be lowered to the point B where the flange 182 contacts the impact absorbing portion 191. [ The first elastic portion 171 compressed by the length L between the point A and the point B forms a repulsive force in a direction opposite to the compression direction and transmits the repulsive force to the valve portion 160 Can be buffered.

When the operating lever is stopped, the gas passage 131 is closed, and the internal space S1 formed by the shock absorbing portion 170 at the point A is sealed. At this time, when the holder 172 descends to the point B, the inner space S1 'formed by the shock-absorbing portion 170 at the point B becomes the inner space formed by the shock-absorbing portion 170 at the point A S1). As the volume of the inner space S1 'formed by the shock absorbing portion 170 at the point B becomes smaller, the gas pressure in the inner space S1' increases, and the gas expands in volume for pressure drop. At this time, the lower part of the inner space is fixed by the piston 150, and a repulsive force to expand through the upper holder part 172 is transmitted. Thus, the repulsive force can be transmitted to the valve unit 160 to buffer the shock felt by the user.

The shock absorbing portion 191 provided at the lower end of the piston rod 151 may be formed of a material having an elastic body such as silicone rubber or urethane. The flange 182 provided at the lower end of the piston 150 may be formed of a material having elasticity, It is possible to absorb the impact generated by contact with the contact portion 191.

When the user gets up from the chair and seats again, the shock absorber 170 forms the cushion function as follows.

When the user is lifted from the chair and the load corresponding to the weight of the user is removed, the force of the spindle 120 and / or the spindle 120 due to the repulsive force formed by the internal space S1 of the first elastic portion 171 or the shock- The cylinder 130 is slightly raised. When the user again sits on the chair, a load corresponding to the weight of the user is applied to the first elastic part 171 or the shock absorbing part 170 through the valve part 160 and the holder part 172 And is transmitted to the inner space S1 '. At this time, a repulsive force having a magnitude corresponding to the load is generated in the inner space S1 'of the first elastic portion 171 or the shock absorbing portion 170 in a direction opposite to the direction of the load. Therefore, the flange 182 can mitigate the impact caused by the contact with the impact absorbing portion 191.

≪ Modification of First Embodiment >

1C is a front sectional view showing a structure of a gas cylinder according to a modification of the first embodiment of the present invention. Referring to FIG. 1C, a gas cylinder 100 'according to a modification of the first embodiment of the present invention includes a base tube The lower chamber 140'b, the piston 150 ', the valve portion 160', the spindle 120 ', the spindle guide 121', the cylinder 130 ', the upper chamber 140'a, 'And a shock-absorbing portion 170'. However, the modified example of the first embodiment of the present invention is different from the original embodiment in other respects, except that the shock absorbing part 170 'is further formed to further include the guide part 174'. Therefore, in the description of this embodiment, the description of the first embodiment will be omitted, and a detailed description thereof will be omitted.

The guide portion 174 'is interposed between the holder portion 172' and the valve portion 160 'to guide the holder portion 172' for a predetermined length.

One end of the guide portion 174 'is inserted into the hollow portion 172'a of the holder portion 172', and the holder portion 172 'and the guide portion 174' are installed in the upper chamber 140'a. Can be connected. The other end of the guide portion 174 'may be connected to the valve portion 160'.

The guide portion 174 'is formed of a material generating a repulsive force and is not limited to a specific material. For example, it may be formed of silicone, rubber, wire, urethane, or a synthetic resin having elasticity. The guide portion 174 'is formed in a shape capable of transmitting the generated repulsive force and is not limited to a specific shape. For example, a spring or a stick shape. Hereinafter, for convenience of description, a coil-shaped spring will be mainly described.

When the spindle 120 'and the cylinder 130' are lowered, the holder portion 172 'contacts the valve portion 160'. At this time, the guide portion 174 'forms a repulsive force between the valve portion 160' and the holder portion 172 'to guide the holder portion 172' to move inside the cylinder 130 '. That is, the holder portion 172 'is prevented from being attached to the valve portion 160', and the holder portion 172 'is moved into the cylinder 130'.

When the inner space S1 of the shock absorbing portion 170 is sealed, a repulsive force due to a pressure difference between the upper chamber 140'a and the inner space S1 of the shock absorbing portion 170 'is generated The impact can be easily absorbed. In addition, the durability of the valve unit 160 'and the holder unit 172' can be increased by reducing damage to the valve unit 160 'and the holder unit 172' caused by the impact.

The guide portion 174 'keeps the holder portion 172' moving in the internal space of the cylinder 130 'so that the internal space S1 of the shock absorbing portion 170' .

≪ Embodiment 2 >

2 is a front sectional view showing a structure of a gas cylinder according to a second embodiment of the present invention.

Referring to FIG. 2, a gas cylinder 200 according to a second embodiment of the present invention includes a base tube 210, a spindle 220, a spindle guide 221, a cylinder 230, an upper chamber 240a, A chamber 240b, a piston 250, a valve portion 260, and an impact- However, the second embodiment of the present invention is different from the first embodiment in that the other parts are the same as those of the first embodiment, except that the shock absorber 270 further includes the first buffer member 273. Therefore, in the description of this embodiment, the description of the first embodiment will be omitted, and a detailed description thereof will be omitted.

The first buffer member 273 is disposed between the holder portion 272 and the valve portion 260. The first cushioning member 273 may be fixedly attached to either the lower surface of the valve unit 260 or the upper surface of the holder unit 272. The first cushioning member 273 may be formed to be linearly movable along the inner surface of the cylinder 230 without being fixed to the lower surface of the valve unit 260 or the upper surface of the holder unit 272.

The first buffer member 273 does not interfere with the opening / closing pin 262 when the upper surface thereof contacts the valve unit 260, and a hollow portion 273a can be formed to guide the gas inside.

The material of the first buffer member 273 may be a material which forms a repulsive force and is not limited to a specific material. For example, rubber, silicone, and elastomeric synthetic resins can be used. However, for convenience of explanation, the first buffer member 273 having a rubber material will be described.

The first buffer member 273 contacts the holder portion 272 and the valve portion 260 when the spindle 220 and the cylinder 230 are lowered. The first cushioning member 273 effectively transmits the repulsive force formed by the internal space S2 of the first elastic portion 271 or the shock absorbing portion 270 to the valve portion 260 to facilitate shock absorption.

If the holder 272 and the valve 260 are in direct contact with each other, the holder 272 or the valve 260 can be damaged during the shock. The first buffering member 273 absorbs the shock The durability of the holder portion 272 and the valve portion 260 can be increased.

≪ Third Embodiment >

3 is a front sectional view showing the structure of a gas cylinder 300 according to a third embodiment of the present invention.

3, the gas cylinder 300 according to the third embodiment of the present invention includes a base tube 310, a spindle 320, a spindle guide 321, a cylinder 330, an upper chamber 340a, A chamber 340b, a piston 350, a valve portion 360 and a shock-absorbing portion 370. [ However, the third embodiment of the present invention is different from the first embodiment in that the other parts are the same as those of the first embodiment, except that the shock absorbing part 370 is further formed by further including the second buffering member 373. Therefore, in the description of this embodiment, the description of the first embodiment will be omitted, and a detailed description thereof will be omitted.

The second buffering member 373 may be applied to at least one of the lower surface of the pipe holder 363 or the upper surface of the holder portion 372. The material of the second buffer member 373 may be a material that forms a repulsive force and is not limited to a specific material. For example, rubber, silicone, urethane, and elastomeric synthetic resins can be used. However, for convenience of explanation, the second buffer member 373 having a rubber material will be described.

The second buffering member 373 effectively transmits the repulsive force formed by the inner space S3 of the first elastic portion 371 or the shock absorbing portion 370 to the valve portion 360 to facilitate shock absorption. The pipe holder 363 or the holder 372 may be damaged when the holder 372 is directly in contact with the pipe holder 363 of the valve 360. The second buffer member 373, The durability of the holder portion 372 and the pipe holder 363 can be increased by absorbing the shock.

<Fourth Embodiment>

4 is a front sectional view showing the structure of a gas cylinder 400 according to a fourth embodiment of the present invention.

Referring to FIG. 4, a gas cylinder 400 according to a fourth embodiment of the present invention includes a base tube 410, a spindle 420, a spindle guide 421, a cylinder 430, an upper chamber 440a, A chamber 440b, a piston 450, a valve portion 460 and an impact mitigating portion 470. [ However, the fourth embodiment of the present invention is the same as the first embodiment except that the shape and arrangement of the holder portion 472 and the repulsive force forming method formed by the internal space S4 of the shock absorbing portion 470 . Therefore, in the description of this embodiment, the description of the first embodiment will be omitted, and a detailed description thereof will be omitted.

The holder portion 472 may include an O-ring 475 to facilitate the sealing of the inner space S4 of the shock absorbing portion 470 along the outer circumferential surface. At least one first groove (groove) 473 can be formed on the inner surface of the upper end of the cylinder 430 located near the valve portion 460. The projection 474 may protrude from the inner surface of the cylinder 430 in the region where the first groove 473 is formed to limit the movement range of the holder 472 within the cylinder 430.

The holder portion 472 is disposed between the projection portion 474 and the valve portion 460. The holder portion 472 is supported by the projecting portion 474 so that the holder portion 472 can not move down the projecting portion 474. [

The force F1 formed by the gas pressure in the upper chamber 440a is greater than the force generated by the gas pressure in the inner space S4 of the shock absorbing portion 470 and the force generated by the first elastic portion 471 The holder portion 472 is supported by the protruding portion 474 and does not move. At this time, the holder 472 is positioned in the region where the first groove 473 is formed, and the gas is supplied to the space between the upper chamber 440a and the inner space S4 of the shock absorbing portion 470 through the first groove 473. [ Can flow.

On the other hand, if F1 is smaller than F2, the holder portion 472 is detached from the protruding portion 474 and rises. The outer surface of the holder portion 472 is sealed by the O-ring 475 when the holder portion 472 is located above the first groove 473 outside the region formed by the first groove 473. [ Therefore, the internal space S4 of the shock absorbing portion 470 is sealed.

When the inner space S4 of the shock absorbing portion 470 is sealed, a repulsive force due to the pressure difference between the upper chamber 440a and the inner space S4 of the shock absorbing portion 470 is generated as described above, Can be absorbed. Also, the durability of the valve portion 460 and the holder portion 472 can be increased by reducing damage to the valve portion 460 and the holder portion 472 caused by the impact.

<Fifth Embodiment>

5 is a front sectional view showing the structure of a gas cylinder 500 according to a fifth embodiment of the present invention.

Referring to FIG. 5, a gas cylinder 500 according to a fifth embodiment of the present invention includes a base tube 510, a spindle 520, a spindle guide 521, a cylinder 530, an upper chamber 540a, A chamber 540b, a piston 550, a valve portion 560, and a shock-absorbing portion 570. [ However, the fifth embodiment of the present invention is the same as the first embodiment and the fourth embodiment, except that the shape and arrangement method of the holder part 572 are different. Therefore, the description of the first embodiment and the fourth embodiment is omitted for the description of the present embodiment, and a detailed description thereof will be omitted.

The second elastic portion 574 is disposed between the holder portion 572 and the valve portion 560 and is fixed to the holder portion 572 and the valve portion 560. At least one second groove (groove) 573 may be formed on the inner surface of the upper end of the cylinder 530 located near the valve portion 560. The holder 572 is located in the region where the second groove 573 is formed and the gas is introduced into the space between the upper chamber 540a and the inner space S5 of the shock absorbing portion 570 through the second groove 573. [ It can flow.

The force F3 formed by the combination of the force generated by the gas pressure in the upper chamber 540a and the force generated by the second elastic portion 574 is applied to the inner space S5 of the shock- The gas is supplied from the upper chamber 540a to the inner space S5 of the shock absorbing portion 570 when the gas pressure is higher than the force F4 formed by the combination of the force generated by the gas pressure and the force generated by the first elastic portion 571. [ The holder portion 572 is located in the region formed by the second groove 573. [

On the other hand, if F3 is smaller than F4, the gas moves from the inner space S5 of the shock absorbing portion 570 to the upper chamber 540a. As a result, when the holder portion 572 moves to the upper end of the cylinder 530, the holder portion 572 is out of the region formed by the second groove 573. The inner space S5 of the shock absorbing portion 570 is sealed when the holder portion 572 is positioned above the second groove 573 outside the region formed by the second groove 573. [

When the internal space S5 of the shock absorbing portion 570 is sealed, a repulsive force due to a pressure difference between the upper chamber 540a and the internal space S5 of the shock absorbing portion 570 is generated, Can be absorbed. In addition, the second elastic portion 574 can easily absorb the impact that forms the repulsive force. In addition, the durability of the valve portion 560 and the holder portion 572 can be increased by reducing damage to the valve portion 560 and the holder portion 572 caused by the impact.

<Sixth Embodiment>

6 is a front sectional view showing the structure of a gas cylinder 600 according to a sixth embodiment of the present invention.

Referring to FIG. 6, a gas cylinder 600 according to a sixth embodiment of the present invention includes a base tube 610, a spindle 620, a spindle guide 621, a cylinder 630, an upper chamber 640a, A chamber 640b, a piston 650, a valve portion 660, and an impact mitigating portion 670. However, the sixth embodiment of the present invention is the same as the first embodiment and the fourth embodiment in the other parts, except that the components of the shock absorber 670 are characteristically different. Therefore, the description of the first embodiment and the fourth embodiment is omitted for the description of the present embodiment, and a detailed description thereof will be omitted.

The shock absorbing portion 670 includes a third elastic portion 671 supported by the piston 650 and providing a repulsive force to the valve portion 660 and a third groove formed in the inner surface of the upper end of the cylinder 630 .

The gas inside the cylinder 630 flows through the third groove 672 into the upper chamber 640a through the third groove 672 while the piston 650 is passing through the third groove 672 during the descent of the spindle 620 and the cylinder 630. [ And the lower chamber 640b. The upper chamber 640a is closed and the closed gas in the upper chamber 640a is communicated with the lower chamber 640a through the upper chamber 640a and the lower chamber 640b when the piston 650 is out of the region formed by the third groove 672. [ A repulsive force due to a pressure difference is generated and the shock can be absorbed easily. Further, the third elastic portion 673 can easily absorb the impact that forms the repulsive force. In addition, the durability of the valve portion 660 and the piston 650 can be increased by reducing damage to the valve portion 660 and the piston 650 caused by the impact.

<Seventh Embodiment>

7 is a front sectional view showing the structure of a gas cylinder according to a seventh embodiment 700 of the present invention and a modification 700a of the seventh embodiment.

7, a gas cylinder 700 according to a seventh embodiment of the present invention and a modified example includes a base tube 710, a spindle 720, a spindle guide 721, a cylinder 730, an upper chamber 740a, A lower chamber 740b, a piston 750, a valve portion 760, and an impact relieving portion 770. However, the seventh embodiment and the modification of the present invention are the same as those of the first embodiment, except that the shapes of the holder portions 772 and 772 are differently formed. Therefore, in the description of this embodiment, the description of the first embodiment will be omitted, and a detailed description thereof will be omitted.

The shape of the holder portion 772 according to the seventh embodiment and the operation principle of the shock absorbing portion 770 are as follows.

The holder portion 772 includes a taper groove 773 having a tapered region along the outer circumferential surface thereof and a first flow path 775 connecting the tapered groove 773 and the upper chamber 740a. The first opening and closing part 774 moves along the tapered groove 773 by the linear movement of the cylinder 730.

The first opening and closing part 774 is formed of a soft material, and is not limited to a specific material. For example, the first opening and closing part 774 formed of rubber will be mainly described below for convenience of explanation.

When the spindle 720 and the cylinder 730 are lowered, the first opening / closing portion 774 moves upward along the tapered groove 773. [ When the cylinder 730 descends in detail, a frictional force acting between the cylinder 730 and the first opening and closing part 774 occurs in a direction opposite to the moving direction of the cylinder 730. [ That is, the first opening and closing part 774 receives the frictional force upward and moves to the upper part of the tapered groove 773. [ The first opening and closing part 774 moves downward when the pressure of the internal space S7 formed by the shock absorbing part 770 is larger than the pressure of the upper chamber 740a. At this time, the first opening / closing portion 774 closes the first flow path 775 and the inner space S7 formed by the shock absorbing portion 770 can be sealed.

The first opening and closing part 774 moves downward along the tapered groove 773 by the frictional force and the pressure difference when the spindle 720 and the cylinder 730 are lifted. At this time, the first opening and closing part 774 opens the first flow path 775 and the gas can move through the gap between the inner surface of the cylinder 730 and the outer surface of the holder part 772.

The operation principle of the components of the shock absorbing portion 770 'and the shock absorbing portion 770' of the gas piston 700 'according to the modified example of the seventh embodiment is as follows.

The shock absorbing part 770 'is inserted between the holder part 772' and the holder part guide 773 ', inserted between the holder part 772' and the holder part guide 773 'disposed inside the cylinder 730' And a second opening / closing portion 774 'disposed in the second opening / closing portion 774'.

The upper part of the holder part 772 'is inserted into the holder part guide 773' after the holder part guide 773 'is inserted, and the holder part 772' And may be formed in the form of a hook (Hook, 772'a) for preventing detachment.

The holder portion guide 773 'is inserted into the holder portion 772' and moves along the inner surface of the cylinder 730 'together with the holder portion 772'. The holder guide 773 'includes at least one second flow path 775' for connecting the upper chamber 740'a and the lower chamber 740'b.

The second opening and closing part 774 'may be formed to be the same as or similar to the first opening and closing part 774 described above. When the second opening and closing part 774 'is engaged with the holder part 772', the second opening and closing part 774 'is formed higher than the upper surface of the holder part 772'.

When the spindle 720 'and the cylinder 730' are lowered, the holder portion 772 'and the holder portion guide 773' are in close contact with each other. At this time, the second opening and closing part 774 'is pressed by the holder part 772' and the holder part guide 773 'to close the second flow path 775'. When the second flow path 775 'is closed, the inner space S7 formed by the upper chamber 740'a and the shock absorbing portion 770 is sealed.

When the inner space S7 formed by the shock absorbing portions 770 and 770 'is sealed, the repulsive force due to the pressure difference in the inner space S7 of the upper chamber 740a and the shock absorbing portions 770 and 770' The impact can be easily absorbed by the repulsive force formed by the first elastic portions 771 and 771 '. In addition, the durability of the valve portion 760 and the holder portions 772 and 772 'can be increased by reducing damage to the valve portion 760 and the holder portions 772 and 772' caused by the impact.

&Lt; Eighth Embodiment >

8 is a front sectional view showing the structure of a gas cylinder 800 according to an eighth embodiment of the present invention.

8, a gas cylinder 800 according to an eighth embodiment of the present invention includes a base tube 810, a spindle 820, a spindle guide 821, a cylinder 830, an upper chamber 840a, A chamber 840b, a piston 850, a valve portion 860, and a shock-absorbing portion 870. [ However, the other parts of the eighth embodiment of the present invention are the same as those of the original embodiment, except that the operation elements of the shock absorbing part 870 and the components of the shock absorbing part 870 are different from each other. Therefore, in the description of this embodiment, the description of the first embodiment will be omitted, and a detailed description thereof will be omitted.

The shock absorbing portion 870 may include a holder portion 872, a third opening and closing portion 873, a fastening portion 874, and a support portion 875. The lower portion of the holder portion 872 may be stepped to engage the third opening and closing portion 873 and the coupling portion 874. The support portion 875 is engaged with the first elastic portion 871, and the surface facing the holder portion 872 is formed flat.

The third opening and closing part 873 may be formed in the same or similar shape as the first opening and closing part 774 described above. The third opening and closing portion 873 is coupled to the lower portion of the holder portion 872, The third opening and closing part 873 is formed higher than the lower surface of the holder part 872.

The fastening portion 874 is provided to prevent the third opening and closing portion 873 from being detached from the holder portion 872. [ The fastening portion 874 may be formed in a washer shape and the third opening and closing portion 873 is engaged with the gap between the fastening portion 874 and the holder portion 872.

When the spindle 820 and the cylinder 830 are lowered, the holder portion 872 and the support portion 875 are in close contact with each other. At this time, the third opening and closing part 873 is pressed by the holder part 872 and the supporting part 875 to close the gap between the holder part 872 and the supporting part 875. When the gap between the holder portion 872 and the support portion 875 is closed, the inner space S8 formed by the upper chamber 840a and the shock absorbing portion 870 is sealed.

When the inner space S8 formed by the shock absorbing portion 870 is sealed, the repulsive force due to the pressure difference between the upper chamber 840a and the inner space S8 of the shock absorbing portion 870 and the first elasticity The impact can be easily absorbed by the repulsive force formed by the portion 871. Also, the durability of the valve portion 860 and the holder portion 872 can be increased by reducing damage to the valve portion 860 and the holder portion 872 caused by the impact.

&Lt; Example 9 &

9 is a front sectional view showing the structure of a gas cylinder 900 according to a ninth embodiment of the present invention.

9, a gas cylinder 900 according to a ninth embodiment of the present invention includes a base tube 910, a spindle 920, a spindle guide 921, a cylinder 930, an upper chamber 940a, A chamber 940b, a piston 950, a valve portion 960, and a shock-absorbing portion 970. [ However, the ninth embodiment of the present invention is the same as the other embodiments except that the operating principle of the shock absorbing part 970 and the components of the shock absorbing part 970 are different. Therefore, in the description of this embodiment, the description of the first embodiment will be omitted, and a detailed description thereof will be omitted.

The shock absorbing portion 970 may include a damper portion 971 and a first spacer 972. The first spacer 972 is positioned between the damper portion 971 and the valve portion 960 so that the valve portion 960 and the damper portion 960 are positioned between the damper portion 971 and the valve portion 960, (971).

The damper portion 971 may include an upper cover 974, a lower cover 975, and a fixture 976. [

The upper cover 974 is installed inside the cylinder 930 and engages an O-ring 973 on the outer circumferential surface of the upper cover 974 to block the flow of gas between the upper chamber 940a and the lower chamber 940b . The lower cover 975 is provided with a piston 950 and a fixing member 976 therein and engages with the upper cover 974. The lower cover 975 may form an embossed structure 977 by applying a press to the outer wall of the lower cover 975 to engage with the fastener 976.

The piston 950 is installed inside the damper portion 971 to control gas flow in the damper portion 971 and the lower chamber 940a. The piston 950 has a tapered region 952 formed along the outer circumferential surface thereof and a case 951 coupled to upper and lower portions of the tapered region 952 and a fourth opening and closing portion 953 moved along the tapered region 952 do.

A constant gap is formed between the fixture 976 and the piston rod 954 so that gas can move through the gap between the inside of the damper portion 971 and the lower chamber 940b. If the pressure of the lower chamber 940b is larger than the pressure of the inner space S9 of the damper portion 941, the fourth opening and closing portion 953 moves toward the damper portion 971 due to the pressure difference. Conversely, when the pressure of the lower chamber 940b is smaller than the pressure of the inner space S9 of the damper portion 971, the fourth opening and closing portion 953 moves toward the lower chamber 940b due to the pressure difference.

The movement of the gas between the inside of the damper part 971 and the lower chamber 940b is cut off when the fourth opening and closing part 953 moves as described above and comes into close contact with the case 951. [ At this time, the inner space S9 of the damper portion 971 is sealed.

When the inner space S9 formed by the damper portion 971 is sealed, a repulsive force is formed similarly to the above. That is, due to the pressure difference between the lower chamber 940a and the inner space S9 of the damper portion 971, the inner space S9 has a size corresponding to the impact force transmitted through the first spacer 972, Which is a direction opposite to the direction of the arrow. The repulsive force can easily absorb the impact generated when the spindle 920 and the cylinder 930 are lowered. In addition, the durability of the valve portion 960 and the damper portion 971 can be increased by reducing damage to the valve portion 960 and the damper portion 971 caused by the impact.

<Tenth Embodiment>

10 is a front sectional view showing the structure of a gas cylinder 1000 according to a tenth embodiment of the present invention.

10, a gas cylinder 1000 according to a tenth embodiment of the present invention includes a base tube 1100, a spindle 1200, a spindle guide 1210, a cylinder 1300, an upper chamber 1400a, A chamber 1400b, a piston portion 1500, a valve portion 1600, and a shock-absorbing portion 1700. [ However, the other parts of the tenth embodiment of the present invention are the same as those of the original embodiment, except that the operating principle of the shock-absorbing part 1700 and the components of the shock-absorbing part 1700 are characteristically different. Therefore, in the description of this embodiment, the description of the first embodiment will be omitted, and a detailed description thereof will be omitted.

The shock mitigation portion 1700 includes a sealing cap 1750 and a second spacer 1760. The second spacer 1760 is disposed at the lower end of the piston rod 1510 in the longitudinal direction of the piston rod 1510 and contacts the sealing cap 1750. The sealing cap 1750 may include a cylinder guide 1730, a sealing member 1710, and a flange 1720. The sealing cap 1750 is formed so as to be able to move away from the cylinder 1300 and is linearly movable along the inner wall of the cylinder 1300.

Specifically, the cylinder guide 1730 is disposed in the lower chamber 1400b and controls gas moving between the gas passage 1310 and the lower chamber 1400b. The cylinder guide 1730 is provided with a groove 1731 so that the cylinder 1300 can be inserted. The length of the groove 1731 is formed to be equal to the length L of the second spacer 1760 so that the cylinder 1300 can contact the bottom portion of the groove 1731 when the spindle 1200 is moved to the bottom dead center .

The sealing member 1710 is provided at the lower end of the cylinder guide 1730 to prevent the gas in the lower chamber 1400b from leaking. The flange 1720 is provided at the lower end of the sealing member 1710 so that the sealing cap 1750 is supported by the second spacer 1760.

When the spindle 1200 and the cylinder 1300 descend, the flange 1720 contacts the second spacer 1760 (point C). At this time, the cylinder 1300 is inserted into the cylinder guide 1730, and the cylinder guide 1730 blocks the flow of gas moving between the gas passage 1310 and the lower chamber 1400b, so that the lower chamber 1400b is sealed .

When the spindle 1200 and the cylinder 1300 continue to descend, the cylinder 1300 contacts the bottom portion of the cylinder guide 1730. (Point D) In other words, the height difference L between the points C and D, The length of the groove 1731 of the guide 1730 and the length L of the second spacer 1760 are the same and the cylinder 1300 is in contact with the bottom portion of the cylinder guide 1730

When the spindle 1200 and the cylinder 1300 are lowered, the sealing cap 1750 moves along the inner wall of the cylinder 1300, so that the volume of the lower chamber 1400b is unchanged and the lower chamber 1400b is sealed, The pressure is kept constant. In the upper chamber 1400a, the lower chamber 1400b is hermetically closed so that the gas does not flow in and out, but the volume of the upper chamber 1400a decreases and the gas pressure therein increases.

The pressure difference between the upper chamber 1400a and the lower chamber 1400b forms a repulsive force on the upper chamber 1400a. That is, when the spindle 1200 and the cylinder 1300 are lowered, the upper chamber 1400a can easily absorb the impact by forming the repulsive force upward to inflate for pressure drop. In addition, the durability of the valve portion 1600 and the damage to the valve portion 1600 caused by the impact can be reduced.

Although the present invention has been described with reference to the limited embodiments, various embodiments are possible within the scope of the present invention. It will also be understood that, although not described, equivalent means are also incorporated into the present invention. Therefore, the true scope of protection of the present invention should be defined by the following claims.

100, 100 ', 200, 300, 400, 500, 600, 700, 770, 800,
110, 110 ', 210, 310, 410, 510, 610, 710, 810, 910,
120, 110 ', 220,320, 420, 520, 620, 720, 820, 920,
121, 121 ', 221, 321, 421, 521, 621, 721, 821, 921, 1210:
130, 130 ', 230, 330, 430, 530, 630, 730, 830, 930,
150, 150 ', 250, 350, 450, 550, 650, 750,
160, 160 ', 260, 360, 460, 560, 660, 760, 860,
170, 170 ', 270, 370, 470, 570, 670, 770, 870, 970, 1700:
171, 171 ', 271, 371, 471, 571, 717, 71', 871:
172, 172 ', 272, 372, 473, 572, 772, 772', 872:
131: gas channel 172a: hollow part
173: coupling groove 180: sealing cap
181: Gas sealing 182: Flange
273: first buffer member 273a: hollow portion
373: second buffer member 473: first groove
573: second groove 574: second elastic portion
672: third groove 773: taper groove
773 'Holder guide 774: First opening / closing part
774 'Second opening and closing part 775:

Claims (18)

delete delete delete delete delete delete delete 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 portion having a pipe holder which hermetically closes the upper end of the cylinder and has a hollow portion for allowing the gas to flow in and out; And
And an impact mitigation portion interposed between the valve portion and the piston,
Wherein the shock-
A holder portion interposed between the piston and the valve portion and linearly moving along the inner surface of the cylinder; A first elastic part supported by the piston and providing a repulsive force to the holder part; A first groove formed on the inner surface of the cylinder; And a protrusion formed on an inner surface of the cylinder to limit a movement range of the holder in the cylinder,
And the inner space between the holder and the piston is sealed when the distance between the holder and the piston is reduced by lowering the spindle and the cylinder. 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 portion having a pipe holder which hermetically closes the upper end of the cylinder and has a hollow portion for allowing the gas to flow in and out; And
And an impact mitigation portion interposed between the valve portion and the piston,
Wherein the shock-
A holder portion interposed between the piston and the valve portion and linearly moving along the inner surface of the cylinder; A first elastic part supported by the piston and providing a repulsive force to the holder part; A second groove formed on the inner surface of the cylinder; And a second elastic part connected to the pipe holder and the holder part,
And the inner space between the holder and the piston is sealed when the distance between the holder and the piston is reduced by lowering the spindle and the cylinder. 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 portion having a pipe holder which hermetically closes the upper end of the cylinder and has a hollow portion for allowing the gas to flow in and out; And
And an impact mitigation portion interposed between the valve portion and the piston
When the spindle and the cylinder are lowered, the shock-absorbing portion is formed so as to seal the inner space of the shock-absorbing portion,
Wherein the shock-
A third elastic portion supported by the piston and providing a repulsive force to the valve portion; And
And a third groove formed in the inner surface of the cylinder,
Wherein during movement of the spindle and the cylinder, gas within the cylinder moves between the upper chamber and the lower chamber through the third groove while the piston passes through the third groove. 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 portion having a pipe holder which hermetically closes the upper end of the cylinder and has a hollow portion for allowing the gas to flow in and out; And
And an impact mitigation portion interposed between the valve portion and the piston,
Wherein the shock-
A holder portion interposed between the piston and the valve portion and linearly moving along the inner surface of the cylinder; A first elastic part supported by the piston and providing a repulsive force to the holder part; A tapered groove having a tapered region formed along an outer circumferential surface of the holder; A first flow path connecting the tapered groove and the upper chamber; And a first opening and closing part that moves along the tapered area by linear movement of the cylinder,
And the inner space between the holder and the piston is sealed when the distance between the holder and the piston is reduced by lowering the spindle and the cylinder. 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 portion having a pipe holder which hermetically closes the upper end of the cylinder and has a hollow portion for allowing the gas to flow in and out; And
And an impact mitigation portion interposed between the valve portion and the piston,
Wherein the shock-
A holder portion interposed between the piston and the valve portion and linearly moving along the inner surface of the cylinder; A first elastic part supported by the piston and providing a repulsive force to the holder part; And a second flow path connecting the upper chamber and the lower chamber, the holder guide being inserted into the holder portion; And a second opening / closing part disposed between the holder part guide and the holder part,
And the inner space between the holder and the piston is sealed when the distance between the holder and the piston is reduced by lowering the spindle and the cylinder. 13. The method of claim 12,
Wherein the second opening and closing portion blocks the second flow path when the holder portion guide and the holder portion are in close contact with each other, thereby sealing the inner space of the shock absorbing portion. 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 portion having a pipe holder which hermetically closes the upper end of the cylinder and has a hollow portion for allowing the gas to flow in and out; And
And an impact mitigation portion interposed between the valve portion and the piston,
Wherein the shock-
A holder portion interposed between the piston and the valve portion and linearly moving along the inner surface of the cylinder; A first elastic part supported by the piston and providing a repulsive force to the holder part; A third opening and closing part provided between the holder part and the first elastic part; A fastening part for fastening the third opening and closing part to the holder part; And a support portion connected to the first elastic portion and positioned at a lower portion of the coupling portion,
Wherein the inner space between the holder and the piston is sealed by close contact between the support portion and the third opening and closing portion when the distance between the holder and the piston is reduced by lowering the spindle and the cylinder. 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 portion having a pipe holder which hermetically closes the upper end of the cylinder and has a hollow portion for allowing the gas to flow in and out; And
And an impact mitigation portion interposed between the valve portion and the piston
When the spindle and the cylinder are lowered, the shock-absorbing portion is formed so as to seal the inner space of the shock-absorbing portion,
Wherein the shock-
A damper portion formed to allow the gas inside the cylinder to flow therein;
And a first spacer located between the damper portion and the valve portion to maintain a gap between the valve portion and the damper portion. 16. The method of claim 15,
The piston,
A tapered region formed in an inner space of the damper portion and formed along an outer circumferential surface of the piston to allow gas to flow into the inner space of the damper portion; And
And a fourth opening and closing part that moves along the tapered area of the piston due to a difference between a pressure of the internal space of the damper part and a pressure of the internal space of the cylinder. A spindle reciprocating up and down according to the height adjustment;
A cylinder mounted inside the spindle and filled with gas;
A piston rod disposed in the cylinder, and a piston holder configured to partition the cylinder into an upper chamber and a lower chamber;
A valve portion for sealing an upper end of the cylinder; And
And a shock absorber having a second spacer disposed at a lower end of the piston rod and a sealing cap sealing the lower chamber,
And the sealing cap is formed so as to be able to be separated from the cylinder. 18. The method of claim 17,
Wherein the shock-
Wherein when the spindle and the cylinder are lowered, the second spacer supports the sealing cap, and the pressure of the gas accommodated in the upper chamber is increased to provide a repulsive force to the valve portion.

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