KR100976011B1 - A Gas-spring - Google Patents

Abstract

The present invention relates to a gas spring, and more particularly, to the operation of the first and second rods of the inner first and second chambers of the cylinder body so that the piston rods provided on both sides of the gas spring can be easily operated in both directions. Due to the volume difference according to the gas pressure of the lower third chamber acts, and relates to a gas spring to be able to operate smoothly by simply controlling the fluid passages of the first and second chambers.

Gas springs, pistons, rods, valve pins, springs.

Description

Gas Spring {A Gas-spring}

The present invention relates to a gas spring, and more particularly, to the operation of the first and second rods of the inner first and second chambers of the cylinder body so that the piston rods provided on both sides of the gas spring can be easily operated in both directions. Due to the volume difference according to the gas pressure of the lower third chamber acts, and relates to a gas spring to be able to operate smoothly by simply controlling the fluid passages of the first and second chambers.

Gas springs, which are widely used in various devices such as mechanical devices, automobile doors, and doorstays of doors, are connected to the piston rod of the cylinder to adjust the operating speed of the device or to stop the shock absorbing function or the proper position. And so on.

Such a gas spring has the following conventional techniques.

1 is an internal cross-sectional view of a general gas spring exemplified in the prior art, and FIGS. 2 and 2a are internal cross-sectional views and an operating state diagram schematically showing another embodiment of the gas spring according to the prior art.

The gas spring 1 according to the prior art operates axially in combination with the piston rod 4 with the first and second pistons 3 and 3a embedded in the cylinder body 2, as illustrated in FIG. 1. The chamber inside the cylinder body is filled with gas such as fluid or gas. The gas spring is provided with a predetermined fluid passage connecting the upper chamber and the lower chamber to the piston 3 and the rod, and when the rod is pressed, the fluid moves upward through the passage of the piston to supply gas to the lower piston 3a. Pressure is to act.

Alternatively, as illustrated in FIG. 2, the opening and closing means 4 for opening or blocking a predetermined fluid passage is provided in the first piston 3 and the piston rod 4 embedded in the cylinder body 2. The first and second chambers are connected by means. The opening / closing means is pressurized by the operating shaft 6 protruding outward of the first rod to open the fluid passage or when the pressing force depressing the operating shaft is removed, opening / closing means by the gas pressure of the second chamber and the third chamber. (4) rises and closes, closes the fluid passage and stops the rod operation.

However, the prior art has a problem that the gas pressure inside the cylinder is relatively weighted to operate the opening and closing means because the internal gas pressure directly acts on the bottom surface of the opening and closing means (4). For this reason, there are disadvantages that require a separate operation means for operating the opening and closing means, for example, an operating lever that increases the operating force using the lever principle, and of course, the configuration is relatively complicated.

Alternatively, as known in the related art of gas springs, there is a Utility Model Publication No. 1982-497 entitled “Length Adjustable Gas Spring” and the like, and a piston in a liquid enclosed in a cylinder in which air pressure is applied. And a valve hole for passing through each other of the seals partitioned by the piston, is formed in the piston, the one end is fixed to the piston, and the other end is piped in the longitudinal direction of the outer circumference of the rod. And a valve for opening and closing the valve hole of the piston in the pipe, and displacing the valve relative to the valve hole.

However, this also increases the risk of malfunction, such as difficulty in pipe operation due to the internal pressure of the cylinder, as well as separation of the valve from the valve hole or slippage, resulting in leakage of internal liquid or gas spring. There were problems such as loss of function as.

The object of the present invention is configured to be operable in both directions with the first and second rods on both sides of the cylinder, as well as easy to use the piston and the rod with a small force due to the difference in diameter (volume) of the first and second rods It is to provide a gas spring that can be operated.

Another object of the present invention is to allow the first and second rods on both sides of the cylinder to be easily stopped at a desired position by the operation of a valve pin connected to an external cable, as well as to open and close the fluid passage of the chamber. The pin is embedded in the first rod to operate regardless of the gas pressure in the cylinder to provide a gas spring that can be easily operated with a small force.

In addition, another object of the present invention is to provide a gas spring that can adjust the operating speed according to the gas pressure and the difference in the cross-sectional area of the first and second rods operating in both directions of the gas spring.

According to the present invention, a fluid is filled into the first and second chambers connected to each other through a predetermined passage by embedding a first piston connected to a first rod in the cylinder body, and by a second piston below the second chamber. In the general gas spring to which the gas pressure of the third chamber is to be applied, a packing groove is formed around the outer side of the first piston, and a second chamber passage is formed on the first chamber passage and the lower edge of the upper edge of the packing groove. Formed; A passage between the upper and lower edges and the cylinder body is opened or blocked by the packing inserted into the packing groove and slidingly contacting the inside of the cylinder body up and down; It is proposed a gas spring characterized in that the second rod coupled to the first piston is formed smaller than the diameter of the first rod and configured to pass through the second piston to the outside of the body.

Alternatively, in the present invention, a fluid is filled into the first and second chambers connected to each other through a predetermined passage by embedding a first piston having a first rod connected to the inside of the cylinder body, and to a second piston below the second chamber. In the general gas spring to the gas pressure of the third chamber to act, the first piston is the packing is coupled to the outer packing groove, the first and second chamber passage in the horizontal direction formed on the upper and lower parts of the packing Connecting the first chamber and the second chamber to each other via a valve passage of the first rod; A valve pin having a valve groove is inserted into the valve passage of the first rod, and the chamber passage is connected or disconnected as the valve pin is connected to an external cable to operate the section. It is proposed a gas spring characterized in that the second rod coupled to the first piston is formed smaller than the diameter of the first rod and configured to pass through the second piston to the outside of the body.

Alternatively, in the present invention, a fluid is filled in the first and second chambers connected to each other through a predetermined passage by embedding a first piston connected to a first rod in the cylinder body, and in the second piston below the second chamber. In the general gas spring to the gas pressure of the third chamber to act by, the first rod is formed with a second chamber passage in the horizontal direction on the upper and lower portions of the first piston, the second chamber passage is a first rod Connecting the first chamber and the second chamber to each other through a valve passage of; A valve pin having a valve groove is inserted into the valve passage of the first rod, and the chamber passage is connected or disconnected as the valve pin is connected to an external cable to operate the section. A packing groove is formed at an outer circumference of the first piston, and a first chamber passage is formed at an upper edge of the packing groove, and is fitted into the packing groove to be in sliding contact with the inside of the cylinder body. A passage between the cylinder body and the cylinder body is opened or blocked; It is proposed a gas spring characterized in that the second rod coupled to the first piston is formed smaller than the diameter of the first rod and configured to pass through the second piston to the outside of the body.

The gas spring of the present invention having the above characteristics is capable of operating in both directions by the first and second rods on both sides of the piston, and by the difference in diameter (volume) between the first rod and the second rod of the cylinder body. And bidirectional operation of the rod has a smooth effect. In addition, there is an advantage that the gas pressure of the third chamber acts on the piston to smoothly operate the piston rod.

In addition, the present invention has the advantage that the operating speed and the operating force of the two rods in accordance with the difference in the cross-sectional area of the rods on both sides of the gas spring is appropriately utilized to smoothly and smoothly operate the various devices, as well as to adjust the operating speed properly to provide.

In addition, the present invention has the effect that the valve pin provided inside the first rod can be operated independently of the gas pressure in the cylinder, so that the valve, that is, the fluid passage can be easily opened and closed with a small force, the valve pin It is convenient to operate by a cable connected with.

Of course, the present invention has the advantage that the operation of the valve for operating the piston and the rod is very smooth, but can control the flow of the fluid in the chamber quickly and accurately, to prevent the occurrence of malfunctions gas spring of the present invention It is accompanied by the advantage of further improving the operation of the device connected to the.

In addition, the present invention has the advantage that can be accurately controlled the operation of the piston rod by the elastic force acts by the spring with the valve pin is built-in to quickly return the valve pin and at the same time the valve is blocked.

In addition, the present invention has an economical advantage that can be easily manufactured in a simple configuration, as well as to significantly reduce the manufacturing cost and production cost to lower the price of the product.

Referring to the gas spring of the present invention in more detail as specific embodiments implemented with reference to the accompanying drawings as follows.

Example 1

Figure 3 is an internal cross-sectional view showing a partially enlarged internal configuration and main parts of the gas spring according to the first embodiment of the present invention.

The gas spring of the present invention includes a first piston 30 in which a first rod 20 is connected to a cylinder body 10, and includes first and second chambers C1 and C2 connected through a predetermined passage. In a general gas spring in which fluid is filled in and the gas pressure of the third chamber (C3) is acted on by a second piston (60) below the second chamber, around the outer circumference of the first piston (30). A packing groove 32 is formed, and a second chamber passage 26 is formed in the first chamber passage 25 and the lower edge 30b of the upper edge 30a of the packing groove; Passages G1 and G2 between the upper and lower edges and the cylinder body are opened or blocked by the packing 36 which is inserted into the packing groove and slides up and down with the inside of the cylinder body; The second rod 50 coupled to the first piston 30 is formed to be smaller than the diameter of the first rod 20 and is characterized in that the configuration to be exposed to the outside of the body through the second piston.

Referring to FIG. 3, the gas spring of the present invention has a cylinder body 10 sealed by both guide parts 12, and includes first and second pistons 30 and 60 therein, respectively. Second and third chambers C1, C2 and C3 are provided, and the chamber is filled with fluid or gas. In addition, the first rod 20 and the second rod 50 coupled to the first piston 30 penetrate through the upper and lower guide portions 12 and are configured to be exposed to the outside and operate in the axial direction. The second rod 50 slides in contact with the second piston so that fluid and gas do not leak.

In other words, fluid is filled in the first and second chambers C1 and C2 of the upper and lower parts of the first piston 30, and a gas such as a compressed gas is provided in the lower third chamber C3 of the second piston. Is charged and the pressure of the compressed gas acts on it.

Here, the first piston 30 is provided with a predetermined fluid passage connecting the first chamber and the second chamber, which is a packing groove having a predetermined width around the outer side as shown in an enlarged view on one side of FIG. (32) forms upper and lower edges 30a and 30b of the packing groove, and the upper edge 30a and the lower edge 30b have a first chamber passage 25 connected to the first chamber. Second chamber passages 26 connected to the second chamber are respectively formed. In addition, the passages G1 and G2 are provided to allow the fluid to pass through the cylinder body at some interval, and the passages G1 and G2 are opened or opened while the packing 36 inserted into the packing groove is operated up and down. Configured to block.

At this time, it is preferable that the size of the first chamber passage 25 is larger than that of the second chamber passage 26, which can adjust the operating speed of the piston and the rod according to the operating direction of the piston and the rod.

The cylinder body preferably forms an extension portion 11 above the upper guide portion and surrounds the first rod exposed to the guide portion. Make sure you can connect. And the guide portion 12 is a general configuration consisting of a guide cap 13 and the retainer (13).

The gas spring according to the first embodiment of the present invention configured as described above is operated as follows. 4 is a cross-sectional view showing an operating state of a gas spring according to the first embodiment of the present invention.

First, when the gas spring of the present invention is left as shown in FIG. 3, the gas pressure of the third chamber is acted to raise the second piston and the rod so that the second rod 50 enters the cylinder body slowly. At this time, as the first rod 20 exits to the outside of the guide part, the space of the second chamber is expanded by the diameter difference, that is, the volume difference with the second rod 50 smaller than the first rod, so that the gas of the third chamber is increased. The first piston is gradually pushed up by the pressure.

Here, the fluid of the first chamber flows down through the first chamber passage 25 and the passage G1 to close the packing 36 to the passage G2 and the passage G2 is blocked so that the second chamber passage is blocked. Only 26 flows the fluid. This is because the piston 30 and the rods 20 and 50 operate slowly because the time of the fluid in the first chamber passes through the relatively narrow second chamber passage 26.

For example, when applied to a doorstay installed in the door, it is possible to prevent sudden operation by closing the door slowly.

On the contrary, when a force for pulling down the second rod 50 acts as shown in FIG. 4, the packing 36 is in close contact with the upper passage G1 to block the fluid of the second chamber. And through the lower passage G2 and the first chamber passage 25 can be quickly moved to the first chamber. At this time, the gas of the third chamber is sufficiently compressed by the small force for operating the rod by the volume difference between the second rod exiting the second chamber and the first rod entering the first chamber. As such, the second rod can quickly exit from the cylinder body, for example, as in the case of the doorstay, no excessive force is applied even when the door is opened.

[Example 2]

5 and 6 are a perspective view and an exploded perspective view showing the configuration of a gas spring according to a second embodiment of the present invention, Figure 7 and Figure 7a is a cross-sectional view showing the internal structure of the gas spring according to a second embodiment of the present invention And "A" section enlarged cross-sectional view.

The gas spring according to the second embodiment of the present invention with reference to the drawings, the first piston 30 is connected to the interior of the cylinder body 10 is connected through a predetermined passage In a general gas spring in which fluid is filled into the first and second chambers C1 and C2, and the gas pressure of the third chamber C3 is acted on by the second piston 60 under the second chamber. The first piston 30 has a packing 36 coupled to the outer packing groove 32, and the first and second chamber passages 34a and 34b in the horizontal direction formed on the upper and lower portions of the packing are first. The first chamber C1 and the second chamber C2 are connected to each other through the valve passage 22 of the rod; As the valve pin 40 having the valve groove 42 is inserted into the valve passage 22 of the first rod 20 and the valve pin 40 is connected to an external cable W, the section operates. The chamber passages 34a and 34b are connected or blocked; The second rod 50 coupled to the first piston 30 is formed to be smaller than the diameter of the first rod 20 and is characterized in that the configuration to be exposed to the outside of the body through the second piston.

Referring to the drawings, the gas spring according to the second embodiment of the present invention is divided into a cylinder body 10, first and second pistons 30 and 60 embedded in the body, and divided by the pistons. It consists of a first, second, third chamber (C1, C2, C3) and the like, the chamber is filled with a fluid or compressed gas. In addition, the first rod 20 and the second rod 50 coupled to the first piston 30 are configured to operate in the axial direction by being exposed to the outside of both guide parts, and also the diameter of the first rod 20 The diameter of the second rod 50 is smaller than that of the second rod 50.

The first rod 20 is a hollow tube having a valve passage 22. The first rod 20 forms packing grooves 28 spaced apart from each other at appropriate intervals, and the springs are in close contact with each other at predetermined intervals. A locking jaw 27 is formed. An elastic force of the spring acts on the valve pin by inserting a spring 48 into the lower end of the valve passage 22 of the first rod 20 and inserting a valve pin 40 below the second rod. Combine and block 50.

The piston 30 is the packing 36 is coupled to the packing groove 32a of the outer middle, and provided with a stepped to reduce the diameter of the upper and lower portions of the packing at a predetermined distance from the inner surface of the cylinder body, The chamber passages 34a and 34b in the transverse direction are formed here. The chamber passage is connected to the chamber passages 24a and 24b of the first rod communicating with the valve passage 22 to provide a predetermined fluid passage, so that the upper first chamber C1 and the lower agent of the cylinder body are provided. The two chambers C2 are connected to each other.

Of course, the first rod 20 and the piston 30 may be assembled by a screw or may be integrally configured to be detachable.

The valve pin 40 is configured to block the valve passage 22 as well as to make sliding contact in the axial direction, and the first chamber passage 24a and the second chamber passage 24b by the valve groove 42 formed on the outside thereof. ), The first and second chambers communicate with each other.

In addition, the valve pin 40 has a stepped portion at an upper end thereof, and a connection part 44 is formed. The valve actuation means is preferably a cable that is easy to operate, and most preferably a flexible cable that operates to push or pull the core wire in the longitudinal direction inside the outer covering.

The inner valve passage 22 of the first rod 20 further includes packings 46a, 46b, and 46c for preventing leakage on the contact surface of the first rod 20, and the packing groove 28. They are formed at predetermined intervals above and below the chamber passage 24a, and below the chamber passage 24b, as shown in the figure. That is, the packing 46 includes packings 46a and 46b disposed above and below the chamber passage 34a and a packing 46c formed below the chamber passage 34b.

The second rod 50 is coupled to the lower end of the first rod to block the valve passage, so that the connecting portion 52 of the upper end is assembled with the first rod and the screw, and extends downward through the second piston 60 to the body It is exposed outward through the lower guide portion of and extends to a predetermined length.

Of course, the second piston is the packing (64,66) is coupled to the sliding contact portion of the cylinder body and the rod, the packing grooves (62a, 62b) is formed on the outside of the second piston and the packing (64a, 64b) is coupled Also, the packing grooves are formed in the inner side, and the packings 66a and 66b are combined to prevent leakage while slidingly contacting the contact portion. The packings 64 and 66 are preferably provided as fluid leakage preventing packings 64a and 66a of the second chamber or gas leakage preventing packings 64b and 66b of the third chamber.

The gas spring of the present invention configured as described above will be more readily understood by the following description of the operating state.

8 and 8A are cross-sectional views illustrating an operating state of a gas spring according to a second embodiment of the present invention, and an enlarged cross-sectional view of a portion “B”.

Referring to the drawings, first, in the state in which the valve of the cylinder is closed, the packing is in close contact with the valve pin 40 and the valve passage 22 connecting the chamber passages 24a and 34a and the chamber passages 24b and 34b. Is blocked, the flow of the fluid in the chamber as well as the gas is stopped in the compressed state, of course, the first rod can support a sufficient load in the stopped state.

Next, when the cable W is pulled, the valve pin is raised while the spring is compressed, and the first chamber passages 24a and 34a and the second chamber passages 24b and 34b are opened through the valve grooves 42. Communicate with each other.

Here, the present invention is easily operated by pushing the piston and the rod by the expansion force of the gas by the cross-sectional area difference between the first rod 20 and the second rod 50. That is, as in the first embodiment of the above, the pressure of the gas acts as much as the diameter (volume) of the first rod 20 and the second rod 50.

Next, when the cable is released, the valve pin is returned downward by the elastic restoring force of the spring, and the valve is blocked, so that the operation may be stopped at any time according to the user's intention.

On the contrary, when the cable is pulled and the valve is opened with the fluid passage, the first rod is pushed into the cylinder or the second rod is pulled out in the opposite direction, so that the first piston is gradually lowered and the second chamber is pulled out. At the same time as the fluid returns to the first chamber, pressure is applied to the second piston by the volume of the first rod that is larger than the volume in the chamber occupied by the second rod, thereby compressing the gas in the third chamber.

Of course, the rod can be stably operated even when the return is lowered, as well as to mitigate the impact force due to sudden operation, the valve is closed by the release of the cable stops the operation.

In addition, the gas spring according to the present invention can reduce or minimize the diameter of the second rod to maximize the difference in the internal pressure of the chamber (C1, C2) according to the cross-sectional area of the first, second rod, or It is possible to implement the same in other embodiments.

9 is an internal cross-sectional view showing another structure of the gas spring according to the second embodiment of the present invention, and FIG. 9A is an enlarged cross-sectional view of the portion “D” of FIG. 9.

That is, the first rod 20 has the lower end of the valve passage blocked by the second rod, but as shown in the figure, by sealing the lower end of the first rod without the second rod, the cylinder pin in the valve pin 40 The pressure does not directly act.

In other words, as already mentioned above, when the valve pin 40 is raised to open the valve and the first rod is raised, the first rod 20 occupying the space of the first chamber is pulled out of the body. The maximum volume difference in the chamber interior occurs. That is, the piston rod is operated with a larger operating force by the maximum gas working pressure of the third chamber by this difference.

Example 3

10 and 10A are cross-sectional views illustrating an internal configuration of a gas spring according to a third exemplary embodiment of the present invention, and an enlarged cross-sectional view of an “E” part of FIG. 10.

Referring to the drawings, the gas spring of the present invention includes a first piston 30 to which the first rod 20 is connected to the inside of the cylinder body 10, and connected to each other through a predetermined passage. In a general gas spring in which fluid is filled in the chambers C1 and C2, and the gas pressure of the third chamber C3 is acted on by the second piston 60 under the second chamber, the first rod ( 20 is a second chamber passage (26a, 26b) in the horizontal direction is formed on the upper and lower portions of the first piston 30, the second chamber passage (26a, 26b) is the valve passage of the first rod (20) Connecting the first chamber C1 and the second chamber C2 to each other through (22); As the valve pin 40 having the valve groove 42 is inserted into the valve passage 22 of the first rod 20 and the valve pin 40 is connected to an external cable W, the section operates. The chamber passages 26a and 26b are connected or blocked; A packing groove 32 is formed around the outer circumference of the first piston 30, and a first chamber passage 25 is formed at the upper edge 30a of the packing groove, and is fitted into the packing groove to form an inner side of the cylinder body. Passages G1 and G2 between the upper and lower edges and the cylinder body are opened or blocked by the packing 36 in sliding contact with the upper and lower sides; The second rod 50 coupled to the first piston 30 is formed to be smaller than the diameter of the first rod 20 and is characterized in that the configuration to be exposed to the outside of the body through the second piston.

The gas spring according to the third embodiment of the present invention includes a cylinder body 10, first and second pistons 30 and 60 embedded in the body, and first, second, and second divided by the pistons. Composed of the third chamber (C1, C2, C3), the chamber is filled with a fluid or gas. In addition, the first rod 20 and the second rod 50 coupled to the first piston 30 exposed to the outside of the body, the valve pin 40 and the valve pin provided in the valve through-hole in the first rod It consists of a spring 48 and the cable (W) for elastically close contact with each other, the diameter of the second rod 50 is also formed smaller than the diameter of the first rod (20). Then, a predetermined fluid passage for connecting the first chamber and the second chamber to the first rod 20 and the piston 30 is provided to be opened and closed by a valve pin.

Specifically, the first chamber and the second chamber are formed by forming second chamber passages 24a and 24b in the horizontal direction at the upper and lower portions of the piston in the first rod 20 and connecting them through the inner valve passage 22. Is communicated. The first piston 30 forms a packing groove 32, and a first chamber passage 25 is formed at the upper edge 30a of the packing groove, and upper and lower edges 30a and 30b of the packing groove are formed. ) And the passages G1 and G2 provided between the body and the body are opened or blocked by the packing 36.

Here, the diameter (cross-sectional area) of the first chamber passage 25 is preferably larger than the diameter (cross-sectional area) of the second chamber passages 26a and 26b, and the second chamber passages 26a and 26b are As in the second embodiment, it is connected through the valve groove 42 of the valve pin (40).

The gas spring of the present invention configured as described above will be more readily understood by the following description of the operating state.

11 and 11A are cross-sectional views illustrating an operating state of a gas spring according to a third embodiment of the present invention, and an enlarged view of a portion “F” of FIG. 11, and FIG. 12 is a view illustrating a gas spring according to a third embodiment of the present invention. An enlarged cross-sectional view showing the piston and rod in an upward operating state.

Referring to the drawings, when the second rod 50 is pulled down while the first second rod is inserted into the cylinder body, the first rod enters the body, and the first rod descends while the fluid and the cylinder descend. As the packing 36 rises and blocks the passage G1 due to the friction of the wall, the fluid of the second chamber is quickly moved to the first chamber C1 through the passage G2 and the first chamber passage 25. At the same time, the gas is compressed while the second piston 60 descends. As described above, this is easily compressed even with a small force by the diameter (volume) difference between the first rod and the second rod.

Subsequently, when the force for pulling the second rod is removed, the piston rises shortly by gas pressure and the packing descends again to block the passage G2 to maintain the gas spring.

Next, referring to FIGS. 10 and 12, when the valve pin 40 is operated by lightly pulling the cable W in the state where the first rod is lowered as described above, the valve groove 42 is connected to the second chamber passage ( The first and second chambers communicate with each other by connecting 26a and 26b, and the passage G2 is blocked by the packing 36. In addition, the rod is operated upward while the piston is raised by the gas pressure of the third chamber, and the fluid gradually moves due to the relatively small diameter of the second chamber passage, and the rods 20 and 50 are also Works slowly.

Thereafter, when the valve is blocked by the valve pin, the rod can be easily stopped at a desired position.

The gas spring of the present invention implemented in the above embodiments is preferably provided with at least one or a plurality of first and second chamber passages to control the flow of fluid.

In addition, the embodiments of the present invention have been described in detail, but are not intended to limit the technical scope of the present invention, and the present invention will be more clearly and easily described by those skilled in the art having ordinary skill in the art. I will.

1 is a cross sectional interior view of a typical gas spring illustrated in the prior art;

2 and 2a is an internal cross-sectional view and an operating state diagram schematically showing another embodiment of a gas spring according to the prior art.

Figure 3 is an internal cross-sectional view showing a partially enlarged internal configuration and main parts of the gas spring according to the first embodiment of the present invention.

4 is a cross-sectional view showing an operating state of a gas spring according to the first embodiment of the present invention.

5 and 6 are a perspective view and an exploded perspective view showing the configuration of a gas spring according to a second embodiment of the present invention.

7 is a cross-sectional view showing the internal structure of the gas spring according to the second embodiment of the present invention and a partially enlarged view of an essential part thereof.

8 is a sectional view showing an operating state of a gas spring according to a second embodiment of the present invention and a partially enlarged view of an essential part thereof.

9 is an internal cross-sectional view showing another structure of the gas spring according to the second embodiment of the present invention, and FIG. 9A is an enlarged cross-sectional view of a portion “D” of FIG. 9.

10 and 10A are cross-sectional views illustrating an internal configuration of a gas spring according to a third embodiment of the present invention, and an enlarged sectional view of an “E” portion of FIG. 10.

11 and 11A are cross-sectional views illustrating an operating state of a gas spring according to a third embodiment of the present invention, and an enlarged view of an “F” portion of FIG. 11.

12 is an enlarged cross-sectional view showing the piston and the rod of the gas spring according to the third embodiment of the present invention in an upward operation state.

Claims (6)

The fluid is filled into the first and second chambers C1 and C2 connected to each other through a predetermined passage by embedding the first piston 30 connected to the first rod 20 in the cylinder body 10. In the general gas spring in which the gas pressure of the third chamber (C3) is acted by the second piston (60) below the second chamber, A packing groove 32 is formed on the outer circumference of the first piston 30, and the second chamber passage 26 is formed on the first chamber passage 25 and the lower edge 30b of the upper edge 30a of the packing groove. ) Is formed; Passages G1 and G2 between the upper and lower edges and the cylinder body are opened or blocked by the packing 36 which is inserted into the packing groove and slides up and down with the inside of the cylinder body; Gas spring, characterized in that the second rod (50) coupled to the first piston (30) is formed smaller than the diameter of the first rod (20) and penetrates the second piston to be exposed to the outside of the body. The fluid is filled into the first and second chambers C1 and C2 connected to each other through a predetermined passage by embedding the first piston 30 connected to the first rod 20 in the cylinder body 10. In the general gas spring in which the gas pressure of the third chamber (C3) is acted by the second piston (60) below the second chamber, The first piston 30 has a packing 36 coupled to the outer lateral groove 32, and the first and second chamber passages 34a and 34b in the horizontal direction formed on the upper and lower portions of the packing are first rods. The first chamber C1 and the second chamber C2 are connected to each other through the valve passage 22 of the first chamber C1 and the second chamber C2; As the valve pin 40 having the valve groove 42 is inserted into the valve passage 22 of the first rod 20 and the valve pin 40 is connected to an external cable W, the section operates. The chamber passages 34a and 34b are connected or blocked; Gas spring, characterized in that the second rod (50) coupled to the first piston (30) is formed smaller than the diameter of the first rod (20) and penetrates the second piston to be exposed to the outside of the body. A fluid is filled in the first and second chambers C1 and C2 connected to each other through a predetermined passage by embedding the first piston 30 connected to the first rod 20 in the cylinder body 10. In the general gas spring in which the gas pressure of the third chamber (C3) is acted by the second piston (60) below the second chamber, The first rod 20 has a second chamber passage (26a, 26b) in the horizontal direction on the upper and lower portions of the first piston 30, the second chamber passage (26a, 26b) is the first rod ( The first chamber C1 and the second chamber C2 are connected to each other through the valve passage 22 of 20; As the valve pin 40 having the valve groove 42 is inserted into the valve passage 22 of the first rod 20 and the valve pin 40 is connected to an external cable W, the section operates. The chamber passages 26a and 26b are connected or blocked; A packing groove 32 is formed around the outer circumference of the first piston 30, and a first chamber passage 25 is formed at the upper edge 30a of the packing groove, and is fitted into the packing groove to form an inner side of the cylinder body. Passages G1 and G2 between the upper and lower edges and the cylinder body are opened or blocked by the packing 36 in sliding contact with the upper and lower sides; Gas spring, characterized in that the second rod (50) coupled to the first piston (30) is formed smaller than the diameter of the first rod (20) and penetrates the second piston to be exposed to the outside of the body. The method according to claim 1 or 3, Gas spring, characterized in that the size of the first chamber passage (25) is configured larger than the second chamber passage (26, 26a, 26b). The method according to claim 2 or 3, Gas spring, characterized in that the inner side of the first rod (20) is provided with a spring (48) in close contact with the valve pin (40). The method according to claim 2 or 3, Gas spring, characterized in that the inner side of the valve passage (22) of the first rod (20) is further provided with a packing (46a, 46b, 46c) for preventing leakage on the contact surface with the valve pin (40).

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