KR100616452B1 - A gas cylinder having an automatic return and height-adjustment functions in a chair - Google Patents

Abstract

The present invention relates to a gas cylinder having a chair's home position return function, comprising: a base tube, a spindle, a cylinder, a piston rod, an upper cam member, and a lower cam member. The through hole is formed in the valve body inserted to seal the upper side up and down, and forming an orifice communicating with the through hole, the through-hole gas inside the upper chamber by the manual operation to the orifice and gas An opening and closing pin is installed to move to the lower chamber through the flow path, and an opening and closing member is installed below the opening and closing pin, and the opening and closing member is a gas introduced from the orifice when the axial load received by the spindle is released. Is opened by the pressure of the gas to move the gas in the lower chamber to the upper chamber To be located at the last position discloses a gas cylinder so that the chair is always returned to its original position after use.

Gas cylinder, upper cam member, lower cam member, spindle, opening and closing pin, opening and closing member

Description

A gas cylinder having an automatic return and height-adjustment functions in a chair}

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

Figure 2 is a cross-sectional view schematically showing another conventional gas cylinder structure.

3 is a cross-sectional view of a gas cylinder with a home position return function according to the present invention.

4 is a detailed view of the upper cam member of the present invention shown in FIG.

5 is a view showing in detail the gas movement in the valve body when the open pin is pressed.

6 is a view showing in detail the gas movement in the valve body when the user rises in the chair.

<Description of the symbols for the main parts of the drawings>

205: spindle 210: base tube

215: tube guide 225: piston rod

230: cylinder 235: upper chamber

240: lower chamber 250: valve body

255: opening and closing pin 260: open pin

261: taper holder 265: orifice

270: gas passage 275: inner holder

The present invention relates to a gas cylinder, and more particularly to a gas cylinder having a function of automatically rotating the gas cylinder to its original position and returning it to its original height when the user rises from the chair seat.

In general, the gas cylinder used in the height adjusting device of the chair is composed of a base tube and a spindle, and when the user sits on the chair, the gas cylinder's spindle is supported by the tube guide in the base tube to move up and down to the chair. The height of the sheet is configured to be adjusted.

FIG. 1 is a cross-sectional view schematically illustrating a conventional gas cylinder structure as described above. Referring to FIG. 1, a conventional gas cylinder 100 has a predetermined gas inside a spindle 105 connected to a seat bottom surface of a chair. The cylinder 130 is fixedly mounted so that the flow path 170 is formed, and the space inside the cylinder 130 is mounted to the upper chamber 135 by a piston 120 that is relatively movable with the cylinder 130. And the lower chamber 140, and the upper end and the lower end of the cylinder 130 to be sealed with the gas sealing unit 145 and the valve body 150, respectively, penetrating the central portion to the valve body 150 An opening orifice 165 is formed to communicate with the through hole 175 and the through hole 175, and the opening and closing pin 155 is opened and closed by the open pin 160 in the through hole 175.

Conventional gas cylinder 100 having the above configuration is when the user is seated on the chair to operate the operating lever (not shown) connected to the open pin 160, the open pin 160 is pressed to the open pin 160 Since the opening and closing pin 155 in contact with the lower side is pushed down, the opening and closing pin 155 is lowered, and when the opening and closing pin 155 is lowered, the opening and closing pin 155 is located between the O-rings located around the lower end thereof. An empty gap is formed in the upper chamber 135 so that the upper chamber 135 is in fluid communication with the orifice 165. Accordingly, the high-pressure gas stored in the upper chamber 135 is moved to the lower chamber 140 along the orifice 165 and the gas flow path 170 through the empty gap, so that the gas in the upper chamber 135 As the volume moves to the lower chamber 140, the volume of the lower chamber 140 increases and the volume of the upper chamber 135 decreases while the spindle 105 descends along the tube guide 115.

Thereafter, when the user removes the force applied to the operation lever (not shown) at a desired height, the opening and closing pin 155 is moved upward again, so that the upper chamber 135 maintains a closed state, Since the gas is no longer moved between the 135 and the lower chamber 140, the chair is fixed at the height desired by the user.

In the conventional gas cylinder as described above, once the user sets the height of the chair, even if the user stands up, the seat of the chair is always kept fixed at the set height, and the direction of the chair is directed to different places. Where chairs are equipped, the heights of the chairs will be kept different, and the chairs will be facing in different directions, giving the impression of unorganized appearance.In the case of chairs used in places such as bank windows, meeting rooms, restaurants, or bars, There is a disadvantage in that the person who organizes the unused chair has to adjust the height directly and turn the chair so that the chair is oriented in a certain direction.

In view of the above, the applicant of the patent application 10-2004-0083405 washer 22 to the piston 20 on the upper side of the piston rod 10 is inserted into the cylinder 14 as shown in Figure 2 And a disk 23 interposed therebetween, and a depression 16 is formed on the outer circumferential surface of the piston 20 with a predetermined depth and length, and the piston at the point where the depression 16 is located ( 20) The O-ring 24 is inserted into the outer circumferential surface to advance the gas cylinder so that the chair is automatically positioned at a constant height when the user seated on the chair rises from the chair.

However, the above application is sometimes piston 20 as the O-ring 24, which is fitted to the outer circumferential surface of the piston 20, does not rise evenly when moved upward by gas pressure in the lower chamber. O-ring 24 is instantaneously fixed to the outer circumferential surface of the), and the O-ring 24 causes the friction with the outer circumferential surface of the piston 20, so as to repeatedly raise and lower the O-ring (O-ring) There is a problem in that the wear of the 24 occurs to fail to fulfill the function required as the opening and closing member, also in the structure, the depression 16 is formed on the outer periphery of the piston 20, the depression 16 After the O-ring 24 is mounted, the piston 20 needs to be fixed again via the elastic ring 26 and the washer 27, so the structure thereof becomes complicated, resulting in a problem of deteriorating management and productivity of the work process. .

The present invention is to solve the above problems, the height of the chair after using the chair in order to reduce the trouble that the person using the chair or the person arranging the arrangement should return the height and direction of the chair to the original position directly It is an object of the present invention to provide a gas cylinder having a function of automatically returning to and back to its original position.

Another object of the present invention is to simplify the structure of the work process by allowing the gas in the lower chamber to move smoothly into the upper chamber when the user sits on the chair while ensuring that the height of the chair is reliably positioned at the desired final height. The present invention provides a gas cylinder that can be easily managed and improves productivity.

According to an aspect of the present invention, there is provided a gas cylinder comprising: a base tube having a receiving space therein and formed to have a predetermined length, a spindle adjustable up and down in the base tube to a desired height position; The cylinder is concentrically inserted and fixed so as to maintain a predetermined gap inside the spindle, and a cylinder in which the upper and lower parts are sealed and gas is filled therein, and one end thereof is fitted inside the cylinder, and the other end is fixed below the base tube. And an upper cam member which is fixedly coupled to the upper outer circumference of the piston rod in a non-rotating manner so that the inner space of the cylinder is partitioned into an upper chamber and a lower chamber and has an inclined surface on the lower surface thereof, and the spindle. While fixedly coupled to the spindle in a non-rotating manner to the outer periphery of the piston rod A gas cylinder comprising a lower cam member fitted to be movable in an axial direction and having an upper surface corresponding to a lower surface of the upper cam member, wherein the cylinder has a valve body inserted to seal the upper side thereof. A through hole vertically penetrated therein and an orifice communicating with the through hole, wherein the gas inside the upper chamber is formed by manual operation into the lower chamber through a gas flow path formed between the orifice, the spindle and the cylinder. An opening and closing pin is provided to enable movement, and an opening and closing member is installed below the opening and closing pin, and the opening and closing member is opened by the pressure of the gas flowing from the orifice when the axial load received by the spindle is released. Allow gas in the lower chamber to be transferred to the upper chamber to And to be positioned at the position.

In addition, an inner holder is inserted into the through hole of the gas cylinder according to the present invention so that the opening and closing pin is movable in the axial direction, and the inner holder has a small diameter portion having a predetermined diameter therein, the small diameter portion and It is preferable to include at least an inclined portion that gradually increases in diameter.

In addition, the opening and closing member is preferably moved downwardly in the inclined portion when the axial load received by the spindle, for example, any one of an O-ring, a seal or an elastic ring of plastic material may be used. have.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

3 is a cross-sectional view of a gas cylinder with a home position return function according to the present invention. Referring to FIG. 3, the gas cylinder 200 according to the present invention has a base tube 210 formed in a predetermined length and has an accommodation space therein, and is located inside the base tube 210. The spindle 205 is supported by the tube guide 215 to be moved up and down and is adjusted to a desired height position, and is inserted concentrically so that a predetermined gap, that is, a gas flow path 270, is formed in the spindle 205. The cylinder 230 is fixedly mounted, the upper and lower parts are sealed and the gas is filled therein, and one end thereof is fitted inside the cylinder 230 and the other end is fixed to the lower side 226 of the base tube 210. Rod 225. Since the configuration of these components and the configuration of the open pin 260, taper holder 261, orifice 265 and the like is substantially the same as the prior art shown in Figure 1, a detailed description thereof will be omitted.

Referring back to FIG. 3, the gas cylinder 200 of the present invention includes a valve body 250 that seals an upper end of the cylinder 230. The valve body 250 is in surface contact with the spindle 205 and the upper and lower pair of O-rings on the upper outer side, and the lower outer surface is in surface contact with the cylinder 230 by one O-ring. In addition, a through hole 273 penetrating up and down in the valve body 250 and an orifice 265 communicating with the through hole 273 are formed in a horizontal direction, and the inner holder 2 below is formed in the through hole 273. 275 is fixedly mounted by a support member, for example washer 272. When the grooves 279 are formed on the upper surface of the washer 272, the gas may be more easily flowed when the gas is introduced into the upper chamber through the orifice.

The inner holder 275 has an opening / closing pin for allowing gas inside the upper chamber 235 to be described later by manual manipulation to the lower chamber 240 through the orifice 265 and the gas flow passage 270. 255 is installed. An open pin 260 connected to an operating lever (not shown) is accommodated in the taper holder 261 in an upper portion of the opening / closing pin 255 to be in contact with an upper portion of the opening / closing pin 255, and the operating lever (not shown). When operating) open pin 260 is pressed to push the opening and closing pin 255 which is in contact with the lower side of the open pin 260 to the lower opening and closing pin 255 is lowered to the upper chamber 235 and The orifice 265 is in fluid communication with the through hole 273.

The inner holder 275 has an O-ring mounted on the upper side and the outer center of the inner holder 275 to maintain airtightness with the valve body 250. The inner holder 275 has a small diameter portion having a predetermined diameter and a diameter gradually adjacent to the small diameter portion. It is made to include at least an inclined portion, the inclined portion is mounted on the lower outer periphery of the opening and closing pins 255 to be described later to be movable up and down. The inclined portion is used in the present invention as a generic term for a tapered shape, a cone shape, and the like.

The opening / closing member 271 is in surface contact with the inner side of the inner holder 275 and the lower side surface of the opening / closing pin 255, and when the pressure in the lower chamber 240 is momentarily increased, the opening / closing member 271 is in the lower chamber 240. Since the pressure acts downward in the inclined portion through the gas flow passage 211, the gas flow passage 270, and the orifice 265 in the lower cam member 286, the pressure moves downward to move the orifice 265 and the upper chamber ( 235 is in fluid communication. The opening and closing member 271 may be made of rubber, plastic, or metal, and as shown in FIG. 2, an O-ring may be used. In addition, various kinds of seals or elastic rings may be used, such as a cylindrical or trapezoidal shape. have.

Referring back to FIG. 3, the gas cylinder of the present invention includes an upper cam member 285 that divides the inner space of the cylinder 230 into an upper chamber 235 and a lower chamber 240 on an upper circumference of the piston rod 225. ) Is fixedly coupled in a non-rotating manner via the washer member 276, and the lower surface of the upper cam member 285 is formed to have an inclined surface with a predetermined slope. The upper chamber 235 and the lower chamber 240 are prevented from communicating with each other by the O-ring fitted to the inner and outer peripheral surfaces of the upper cam member 285, the upper cam member 285 of the present invention is a piston It also plays a role.

In addition, the gas cylinder of the present invention has a lower cam member 286 having a hollow portion up and down on the lower side of the spindle 205 in a non-rotating manner with the spindle 205, for example, in the same manner as the embossing 221. It is fixedly inserted, and the piston rod 225 is fitted to be movable in the axial direction while keeping the gas tight. At one side of the lower cam member 286, a gap between the spindle 205 and the cylinder 230, that is, a gas flow path 211 for allowing the gas flow path 270 and the lower chamber 240 to communicate with each other, is formed. The upper surface is provided with an inclined surface having a predetermined slope corresponding to the lower surface of the upper cam member 285.

The piston rod 225 of the gas cylinder according to the present invention has a knurling portion 226 on the upper portion thereof, as shown in FIG. 4, and is coupled to the upper cam member 285 in a knurling manner. A joint 227 is provided on an upper portion of the knurling portion 226, which is coupled to the upper portion of the upper cam member 285 and the washer 228 in a joint manner.

An operation of the gas cylinder 200 according to the present invention having the above configuration will be described with reference to FIGS. 3 to 6.

First, when the user operates the operation lever (not shown) connected to the gas open pin 260 while sitting on the chair to lower the height of the chair, the open pin 260 is pressed. When the open pin 260 is pressed downward, the opening pin 255 is lowered as shown in FIG. 5. When the opening and closing pin 255 is lowered, a slight gap is formed between the opening and closing pin 255 and the O-ring 271. Due to this gap, the upper chamber 235 is in fluid communication with the orifice 265. Accordingly, the high-pressure gas stored in the upper chamber 235 is orifice 265 and the gas flow path 270 through a gap formed between the opening and closing pin 255 and the O-ring 271 as shown in the arrow of FIG. And move to the lower chamber 240 along the gas flow passage 211 of the lower cam member 286.

When the gas in the upper chamber 235 moves to the lower chamber 240, the volume of the upper chamber 235 is reduced and the volume of the lower chamber 240 is increased, the cylinder 230 is lowered down The lower cam member 286 is spaced apart from the upper cam member 285.

Thereafter, when the user removes the force applied to the operation lever (not shown) at a desired height, the opening and closing pin 255 and the open pin 260 are moved upward as shown in FIG. Since the opening and closing pins 255 and the O-rings 271 are closely coupled to seal the upper chamber 235, the gas is not moved further between the upper chamber 235 and the lower chamber 240. Thus, the chair is fixed at the height desired by the user.

Then, when the user wakes up from the chair after using the chair, that is, when the axial load received by the spindle 205 is released, the pressure by the user's weight is removed so that the spindle 205 rises slightly, and accordingly the lower chamber As the volume of the 240 decreases slightly, the gas pressure increases instantaneously, so that the increased gas pressure is increased by the O-ring 271 through the gas passage 211, the gas passage 270, and the orifice 265 of the lower cam member 286. As shown in Figure 6 slightly pushed downwards to form a gap between the opening and closing pin 255 and the O-ring (271). Therefore, the gas moves to the upper chamber 235 through the gap as shown by the arrow of FIG.

As the gas moves from the lower chamber 240 to the upper chamber 235, the volume of the upper chamber 235 increases and the volume of the lower chamber 240 decreases, so that the spindle 205 moves upward. do. As the spindle 205 continues to move upward, the lower cam member 286 fixedly coupled to the lower portion of the spindle 205 also moves upward. The spindle 205 ascends until the volume of the lower chamber 235 becomes zero so that the spindle 205 ascends to the maximum raised position.

If the user takes a seat and uses the direction of the chair in a fixed state and then rises from the chair, the lower cam member 286 has a separate rotational motion because its upper surface coincides with the lower surface of the upper cam member 285. This does not happen. However, when the user rises from the chair in a state in which the direction of the chair is moved in a predetermined direction after the user is seated, the lower cam member 286 is raised and the upper surface is in contact with the lower surface of the upper cam member 285, the lower The rotation operation is generated by the pressure generated by the gas movement from the lower chamber 240 to the upper chamber 235 until the upper surface of the cam member 286 coincides with the lower surface of the upper cam member 285.

Thus, in the case of using the gas cylinder of the present invention, if the user gets out of the chair after using the chair, the chair always returns to its original state in height and direction.

With the gas cylinder equipped with the home position return function according to the present invention, the chair automatically returns to the original position when the user wakes up after using the chair, so that the user or a third party does not need to return the position of the chair to the original position. There is no effect.

Therefore, it is not necessary to arrange the chair after using the chair separately, the cost is reduced, and the chair is not used because it always faces a certain height and a certain direction, there is aesthetically neat and tidy feeling.

Further, according to the gas cylinder of the present invention, the gas in the lower chamber is smoothly moved into the upper chamber when the user sits on the chair so that the height of the chair is reliably positioned at the desired final height while simplifying the structure. This facilitates management of the work process and improves productivity.

Although the present invention has been described with reference to the embodiments described above, it can be said that it is exemplary, and those skilled in the art can come up with various modifications and equivalent embodiments therefrom, such an equivalent implementation It is only natural that examples should also be regarded as included within the claims of the present invention. Therefore, the true scope of protection of the present invention should be determined only by the appended claims.

Claims (4)

A base tube having a receiving space therein and formed to a predetermined length; A spindle that moves up and down inside the base tube and is adjustable to a desired height position; A cylinder which is fixedly mounted by being inserted concentrically so that a predetermined gap is maintained in the spindle, the upper and lower parts of the cylinder are sealed, and a gas is filled therein; A piston rod having one end fitted into the cylinder and the other end fixed to the lower side of the base tube; An upper cam member fixedly coupled to the upper outer circumference of the piston rod in a non-rotating manner so as to partition the inner space of the cylinder into an upper chamber and a lower chamber, and having an inclined surface on a lower surface thereof; The lower cam member includes a lower cam member which is fixedly coupled to the spindle in a non-rotating manner to the lower portion of the spindle and is axially movable on an outer circumference of the piston rod and has an upper surface corresponding to the lower surface of the upper cam member. In the gas cylinder, The cylinder includes a through hole penetrating up and down inside the valve body inserted to seal the upper side thereof, and an orifice communicating with the through hole, wherein the gas inside the upper chamber is operated by manual operation. And an opening and closing pin to move to the lower chamber through a gas flow path formed between the spindle and the cylinder, An opening and closing member is installed below the opening and closing pin, and the opening and closing member is opened by the pressure of the gas flowing from the orifice when the axial load received by the spindle is released so that the gas in the lower chamber is moved to the upper chamber. To position the spindle at a predetermined final position. The method of claim 1, The through hole is fixedly inserted into the inner holder is inserted to be movable in the axial direction, The inner holder includes a small diameter portion having a predetermined diameter therein and at least an inclined portion that gradually increases in diameter adjacent to the small diameter portion. The method of claim 2, The opening and closing member is a gas cylinder, characterized in that for moving downward in the inclined portion when the axial load received by the spindle. The method of claim 1, The opening and closing member is a gas cylinder, characterized in that any one of an O-ring, a seal or an elastic ring made of plastic.

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