KR100294053B1 - Apparatus for adjusting heighe of gas cylinder type chair - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a height adjusting device for a gas cylinder chair having a piston in which a piston and an “O” ring are integrated by an insert molding method. The height adjusting device of the gas cylinder chair of the present invention for implementing this is at least a cylindrical spindle, a pipe holder installed on the inner upper end of the spindle, a piston rod inserted into the lower end of the spindle and supporting the spindle, A gas cylinder type height adjusting device including a piston fixed to an upper end of a piston rod and having an O-ring inserted for airtight inside the cylinder, wherein the piston has a cylindrical body having an inner diameter into which the piston rod is inserted. And a molded part made of a heterogeneous elastic material in which a plurality of elastic protrusions are formed in the inner and outer diameters of the body part. Therefore, in manufacturing the piston which is a part of the height adjusting device of the gas cylinder type chair, since the inside and the outside of the piston body are integrally coated with an O-ring for maintaining the airtight inside the cylinder with elastic material, the structure It is possible to manufacture a simple and can be mass-produced, there is an effect that can significantly reduce the manufacturing cost.

Description

Height adjustment of gas cylinder chair {APPARATUS FOR ADJUSTING HEIGHE OF GAS CYLINDER TYPE CHAIR}

The present invention relates to a height adjusting device for a gas cylinder chair, and more particularly, to a height adjusting device for a gas cylinder chair having a piston in which a piston and an elastic member are integrated in an insert molding method.

In general, the chair is installed by using a part called the spindle to support the weight of the seated person and to adjust the height according to the user's body shape.

This spindle is a very important part to adjust the seating height of the chair, and there are two main methods of adjusting the seat. The screw adjustment method using a screw spindle and the gas cylinder method that is usually operated by filling the nitrogen (N ₂ ) gas inside.

Of these chair height adjustment method, the present invention relates to the components used in the gas cylinder chair spindle height adjustment device (hereinafter referred to as "gas cylinder type") will be described below the gas cylinder type.

Conventionally, the gas cylinder type has a structure as shown in FIG.

1 is a longitudinal sectional view showing a spindle which is a part of a conventional gas cylinder chair height adjusting device.

In this figure, reference numeral 10 denotes a rod-shaped spindle. The outer cylinder 20 of large diameter is attached to the outside of this spindle 10, and the piston rod 30 is attached to the lower part.

On the upper side of the spindle 10, an actuating protrusion 14, which is mechanically connected to an adjustment lever for a height adjusting device of a chair (not shown), is fixedly disposed by a taper holder 16, and a gas actuating protrusion is disposed thereunder. 14 and the gas opening and closing pin 19 are disposed to abut.

The gas opening and closing pin 19 is installed to be movable up and down on the pipe holder 40 installed in the spindle 10 to be airtight. The detailed structure of this pipe holder 40 is mentioned later.

The outer cylinder 20 is cylindrical and the spindle support 50 and the piston rod 30 of the lower portion is welded and fixed, and the upper portion of the spindle 10 is tapered to be inserted into a seat plate (not shown) The part 12 is comprised.

In the spindle 10, a cylinder 44 having a diameter smaller than the spindle 10 in the longitudinal direction is disposed, and in the spindle 10, a predetermined cushioning member is disposed for the comfort of the seated occupant, and is seated. The thrust bearing 60 is seated on the spindle support 50 to support the load of the ruler and smoothly rotate the spindle 10. Reference numeral 62 denotes a cushioning body made of rubber or the like, and the cushioning body 62 smoothly contacts the bottom of the spindle 10 when the spindle 10 descends to the maximum to mitigate the impact thereof.

In addition, the lower part of the piston rod 30 is fixed to the spindle support 50 by a clip 70 so that attachment / detachment is possible.

Next, the structure of the said pipe holder 40 is demonstrated in detail.

2A is a plan view showing a conventional pipe holder 40, FIG. 2B is a sectional view showing a conventional pipe holder 40, and FIG. 2C is a bottom view showing a conventional pipe holder 40. As shown in FIG.

As shown in these figures, the pipe holder 40 has a cylindrical shape as a whole, and forms an operation hole 41 for receiving the gas opening and closing pin 19 at the center thereof, and has an airtight shape in the outer O-ring groove 43. One or more O-rings 45 are fitted in order to maintain the pressure.

The inner center of the pipe holder 40 is a space 46 for distributing gas, and at least two O-rings 45 are disposed on both sides in the space 46 for airtightness. In addition, the space portion 46 is provided with an inner holder 47 for maintaining the gap of the O-ring 45 and the smooth slide operation of the gas opening and closing pin 19.

One side of the inner holder 47 is drilled with a fine hole 47a so as to be connected to the orifice 42. An orifice 42 is formed at one side of the pipe holder 40 to serve as a passage between the space 46 and the outside in correspondence with the micro holes 47a.

The gas opening / closing pin 19 is formed of a small diameter portion 19a in which a middle portion of a predetermined length is set smaller in diameter than other portions, and finally, the gas opening / closing pin is formed by forming the small diameter portion 19a. When 19 is lowered, a small gap is formed between the pipe holder 40 and the first chamber A, so that the gas in the first chamber A is supplied to the space 46 in the center of the pipe holder 40. This gas is made to flow to the second chamber B through the orifice 42.

In FIG. 2B, reference numerals 19b and 19c are installed at the end of the gas opening and closing pin 19 to wash the O-ring 45 in the pipe holder 40. In FIG. 2C, reference numeral 48 denotes the washers 19b and 19c. A caulking portion for crimping and crimping a portion of a hole in the bottom of the pipe holder 40 to fix the inner side, 49 is formed in the middle portion of the outer portion of the pipe holder 40 to hold the cylinder 44 fixed It's a step. The first chamber A is filled with a predetermined oil and nitrogen (N ₂ ) gas as working fluids and gases.

In addition, in FIG. 1, reference numeral 52 denotes a slide motion holding member which is disposed between the spindle 10 and the outer cylinder 20 to hold the spindle 10 in the outer cylinder 20 so that the slide movement is possible.

Next, the piston provided above the piston rod 30 is demonstrated with reference to FIG. Figure 3 is an enlarged cross-sectional view showing a piston portion used as part of the conventional gas cylinder chair height adjustment device.

In this figure, reference numeral 80 denotes a piston, and the piston 80 is fixed to the upper end of the piston rod 30 by a piston rod head 87 that is caulked. The O-ring 82 is inserted and sealed at 82a) outside.

Various members are provided in order for the piston 80 to work closely and smoothly in the cylinder 44 and not to escape from the spindle 10.

The lower part of the said spindle 10 is formed by bending inward so that the whole piston 80 may not come out.

A flange 83 is disposed at the inner bottom of the piston 80, and a seal 84 for dissipating the gas in the cylinder 44 in an airtight manner is disposed on the flange 83.

A ring member 85 and a cylinder fixture 86 are arranged between the piston 80 and the seal member 84 in order from above. In the ring member 85, a spring ring 88 is mounted to fix the piston 80, and the cylinder fixture 86 supports the lower end of the cylinder 44.

The cylinder fixture 86 will be described with reference to FIG. 4. In this figure, reference numeral 86a denotes a gas flow hole formed outside the cylinder fixture 86. This gas flow hole 86a serves as a passageway through which the gas in the first chamber A enters the third chamber C through the second chamber B. As shown in FIG. Due to the formation of the gas flow holes 86a, the first chamber A, the second chamber B, and the third chamber C communicate with each other.

The arrow direction in FIG. 4 currently shows a state in which gas is discharged from the third chamber C to the first chamber A. FIG.

In the conventional gas cylinder chair height adjustment device having such a configuration, as shown in FIG. 1, when the operation protrusion 14 installed at the top of the spindle is pressed by the height adjustment lever of the chair (not shown), the operation protrusion ( 14 is pressed down the opening pin 18 and the gas opening and closing pin 19 disposed in the lower portion. This state is shown in FIG.

When the gas opening and closing pin 19 is pressed, the small diameter portion 19a formed in the middle portion of the gas opening and closing pin 19 is downward, so that the space 46 and the first chamber A communicate with each other. Since the space portion 46 communicates with the microhole 47a drilled in the inner holder 47 and the orifice 42 drilled in the pipe holder 40, the space 46 of the first chamber A is opened through these holes. The gas is temporarily discharged to the second chamber B side (see the arrow in FIG. 5).

In addition, the gas in the first chamber (A) is released to the second chamber (B) at the same time, and at the same time, the third chamber (C) is opened through the gas flow hole (86a) drilled in the cylinder fixture (86) below the second chamber (B). ) Side.

As the gas collects in the third chamber C side, the amount of gas in the first chamber A decreases and the amount of gas in the third chamber C increases. The piston 80 is fixed to the piston rod 30 and pushes the spindle 10 upward in reaction. This state is shown in FIG.

As shown in this figure, the piston 80 has a higher gas pressure than the first chamber A side at the third chamber C, and thus smoothly pushes up the spindle 10, so that the piston 80 has the outer cylinder. Since the spindle support 50 of 20 is built in, the spindle 10 is raised by reaction.

However, the above-described conventional gas cylinder chair height adjusting device has the following problems.

First, the piston 80 is processed with a metal material, usually aluminum is selected in various aspects, such as workability. Because aluminum is expensive, it is disadvantageous in terms of manufacturing cost and easily damaged during various processing processes.

Therefore, the components such as gas cylinder type to maintain the airtight must maintain the surface of the high precision, glossiness, there was a problem that the probability of product defects due to the occurrence of scratches during processing.

Second, the machining cost increases as the piston 80 is processed, which makes it difficult to mass-produce and, as a result, the manufacturing cost is high, resulting in a weakening of the competitiveness.

Third, the piston 80 requires an assembly process of the O-ring 82, which is fitted into the metal body and the outside or the inside during the manufacturing process, further increases the facility investment cost, resulting in waste of manpower.

Fourth, the piston 80 may be considered to be manufactured by injection molding a metal main body except for the O-ring, but this is a mold line between the upper and lower molds, so that the finishing process is added and the finished product is gas-free. As a component requiring airtightness, there was a problem that the product had to be a product of low degree.

Accordingly, the present invention was devised to solve the above problems, and an object of the present invention is to integrate a piston and an O-ring ("O" ring) in an insert molding method to reduce the manufacturing cost and improve the manufacturing process. It is to provide a height adjustment device of the cylindrical chair.

1 is a longitudinal sectional view showing a spindle that is a part of a conventional gas cylinder chair height adjustment device

Figure 2a is a plan view showing a conventional pipe holder

Figure 2b is a cross-sectional view showing a conventional pipe holder

Figure 2c is a bottom view showing a conventional pipe holder

Figure 3 is an enlarged cross-sectional view showing a piston portion of the conventional gas cylinder chair height adjustment device.

Figure 4 is an enlarged cross-sectional view showing a state in which the gas is re-operated after refilling the third chamber in the conventional gas cylinder chair height adjustment device

5 is an enlarged cross-sectional view showing an operating state in which the gas opening and closing pins are lowered in the conventional gas cylinder chair height adjustment device;

6 is an enlarged cross-sectional view showing an operating state in which the entire spindle is lowered by filling gas into a third chamber in a conventional gas cylinder type height adjusting device.

Figure 7a is a perspective view showing a part of the piston of the present invention

7b is an overall perspective view of the piston of the present invention

Figure 7c is a cross-sectional view showing a piston of the present invention

8 is a longitudinal sectional view showing a gas cylinder spindle showing a state where the piston of the present invention is installed;

<Explanation of symbols for main parts of the drawings>

10: spindle 12: insert

14: working projection 16: taper holder

19: gas opening and closing pin

19a: small diameter portion 19b, 19c: washer

20: outer cylinder 30: piston rod

40: pipe holder 41: operating hole

42: orifice 43: oring groove

44: cylinder 45: O-ring ("O" ring)

46: space portion 47: the inner holder

47a: microhole 48: caulking portion

49: step 50: spindle support

52: slide movement holding member

60: thrust bearing 62: cushion body

70: clip 80: piston

82: O-ring 83: flange

84 seal material 85 ring member

86a: gas distribution hole 86: cylinder fixture

87: piston rod head 88: spring ring

100: piston 110: main body

112: piston rod insertion hole 120: elastic material

122, 124: elastic protrusions

A: Room 1 B: Room 2

C: Room 3

Height adjusting device of the gas cylinder chair of the present invention for achieving the above object,

At least a cylindrical spindle, a pipe holder mounted on the inner top of the spindle, a piston rod inserted at the bottom of the spindle and supporting the spindle, and fixed to the top of the piston rod and an O-ring for airtight inside the spindle. In the height adjusting device of the gas cylinder-type chair including the inserted piston,

At least a cylindrical spindle, a pipe holder mounted on the inner top of the spindle, a piston rod inserted at the bottom of the spindle and supporting the spindle, and fixed to the top of the piston rod and an O-ring for airtight inside the spindle. In the height adjusting device of the gas cylinder-type chair including the inserted piston,

The piston is

A cylindrical body having an inner diameter into which the piston rod is inserted;

It is characterized by integrally molding a heterogeneous elastic material formed a plurality of elastic protrusions in the inner and outer diameters of the main body.

In the above configuration, the space for inserting the ring member at the lower end of the inner diameter is characterized in that further integrally formed, the body portion of the piston is a metal material, the body portion of the piston is preferably a resin material, the elastic material is a rubber material. Do. The piston may be insert molded, and the elastic protrusion may be at least one.

Therefore, in manufacturing the piston which is a part of the height adjusting device of the gas cylinder type chair, since the inside and the outside of the piston body are integrally coated with an O-ring for maintaining the airtight inside the cylinder with elastic material, the structure It is possible to manufacture a simple and can be mass-produced, there is an effect that can significantly reduce the manufacturing cost.

Hereinafter, the height adjusting device of the gas cylinder chair of the present invention will be described in more detail with reference to FIGS. 7 to 8.

In addition, in all the drawings for demonstrating an embodiment, the thing with the same function uses the same code | symbol, and the repeated description is abbreviate | omitted.

Figure 7a is a perspective view showing a cut part of the piston of the present invention, Figure 7b is a whole perspective view showing the piston of the present invention, Figure 7c is a cross-sectional view showing a piston of the present invention, Figure 8 is a piston of the present invention is installed Longitudinal sectional drawing which shows the gas cylinder spindle which showed the state.

In the figure, reference numeral 100 denotes a piston of the present invention. Reference numeral 110 denotes a main body of the piston 100, reference numeral 112 denotes an insertion hole of the piston rod 30, reference numeral 120 denotes an elastic material made of an elastic material, and reference numerals 122 and 124 denote airtightness in the cylinder 44. In order to maintain the inner and outer diameter of the piston is shown an elastic protrusion body integrally formed with an elastic material.

The piston 100 has a structure in which a rubber-like elastic material 120 is formed on the inner and outer diameters of a substantially cylindrical body part 110 which is insert-molded with a resin or a metal material.

The body portion 110 is formed in the center of the circular hole for inserting the upper end of the piston rod (30).

The piston of the present invention in which the elastic material 120 is coated is provided with elastic ring bodies 122 and 124 having an O-ring shape protruding from the inner and outer diameters thereof, respectively.

The O-ring elastic protrusions 122 and 124 are for sealing the inside of the cylinder 44 to prevent the gas from leaking out, and are integrally formed with the elastic member 120.

The O-ring-shaped elastic protrusion 124 protruding from the inner diameter of the piston 100 is tightly coupled to the outer diameter of the piston rod 30 to maintain airtightness, and has an O-ring shape protruding from the outer diameter of the piston 100. The elastic protrusion body 122 is in close contact with the cylinder 44 of the inner diameter of the spindle 10 to seal the gas inside the cylinder.

In the present invention, the O-ring-shaped elastic protrusions 122 and 124, respectively, one implemented in the inner and outer diameter of the piston 100, but can be implemented by increasing the number as necessary.

As shown in Figure 7c and 8, the piston 100 structure of the present invention has an inner diameter (a) for inserting the piston rod 30 in the center thereof is formed, the spring at the lower end of the inner diameter (a) The space for inserting the ring 88 and the ring member 85 is integrally formed.

Therefore, in manufacturing the piston which is a part of the height adjusting device of the gas cylinder chair, since the O-ring for maintaining the air tightness inside the spindle is constructed integrally with an elastic material inside and outside the piston body, the structure It is possible to manufacture a simple and can be mass-produced, there is an effect that can significantly reduce the manufacturing cost.

As described above, according to the height adjusting device of the gas cylinder chair according to the present invention, since the piston is manufactured by integrally molding an elastic material inside / outside of the piston and greatly reducing various components, the structure It is possible to manufacture a simple and can be mass-produced, there is an effect that can significantly reduce the manufacturing cost.

In addition, preferred embodiments of the present invention are disclosed for the purpose of illustration, those skilled in the art will be able to various modifications, changes, additions, etc. within the spirit and scope of the present invention, these modifications and changes should be seen as belonging to the following claims. something to do.

Claims (7)

At least a cylindrical spindle, a pipe holder mounted on the inner top of the spindle, a piston rod inserted in the lower end of the spindle and supporting the spindle, and fixed to the top of the piston rod and an O-ring for airtight inside the spindle. In the height adjusting device of the gas cylinder-type chair including the inserted piston, The piston is A cylindrical body having an inner diameter into which the piston rod is inserted; A height adjusting device for a gas cylinder chair, which is integrally formed with a heterogeneous elastic material having a plurality of elastic protrusions formed on inner and outer diameters of the main body. The height adjusting device of the gas cylinder chair according to claim 1, wherein a space for inserting the ring member at the lower end of the inner diameter is further integrally formed. The height adjusting device of the gas cylinder chair according to claim 1, wherein the main body of the piston is made of metal. The height adjusting device of the gas cylinder chair according to claim 1, wherein the main body of the piston is resin. The height adjusting device of the gas cylinder chair according to claim 1, wherein the elastic material is a rubber material. The height adjusting device of a gas cylinder chair according to claim 1, wherein the piston is insert molded. The height adjusting device of the gas cylinder-type chair according to claim 1, wherein the elastic protrusions are at least one.