KR20150003143A - Conduit Connecting Apparatus Having a Bush - Google Patents

Abstract

The present invention relates to a conduit connecting device having a bush The conduit connecting device of the present invention comprises: a body including a connection unit, into which the front end of a conduit is inserted to connect the conduit, provided in at least one side, wherein a male thread is formed on the outer circumferential surface of the connection unit; a nut on which a female thread that can be coupled to the male thread is formed to be coupled to the connection unit of the body; and a bush including a cylindrical body which is fitted on the outer circumference of the conduit, a cut portion formed at one side of the body so that the body can be elastically fixed on the outer circumference of the conduit, and a separation preventing unit which is integrally formed in the body and applies pressure to the conduit to prevent separation. Thus, sealing performance in connecting a conduit can be highly improved and full insertion of the conduit without an error can be expected.

Description

{Conduit Connecting Apparatus Having a Bush}

[0001] The present invention relates to a pipe fitting including a bush, and more particularly to a pipe fitting including a bushing which greatly enhances airtightness in tightening a pipe and prevents errors in full insertion of the pipe .

In general, a pipe (pipe or tube) used for piping for transferring a liquid or a gas is manufactured in a predetermined length according to the standard, so that a plurality of pipes are connected to each other to form a pipe having a desired length and shape. Accordingly, pipe joints of various materials and shapes are used for pipe connection, and such pipe joints are structured such that the fluid to be transferred can be sealed so as not to leak through pipe joints.

Various types of piping are commercially available and used depending on the material. Generally, most of the pipes are made of non-ferrous metal pipes made of light metal such as copper alloy or aluminum, and synthetic pipes using synthetic resin such as PVC. The pipe fittings connecting the pipes are provided with an elbow type connecting port for changing the direction of the pipe according to the use thereof, a tee type connecting pipe for branching the new pipe from the existing pipe, And a union connector for connecting the piping. Various methods for connecting the piping accessories to the piping have been developed and used.

Conventionally, a conventional pipe connection port used for connection of a pipe made of a metal material has a plurality of pipe insertion ports so that at least two pipe ends can be inserted according to the pipe configuration of the hollow body, And a screw is formed on the end of each pipe to be connected so that the pipe can be inserted and inserted into the insertion port of the pipe connection port.

However, since such a conventional pipe connection can not completely seal the pipe connection part, a separate sealing member made of synthetic resin or the like must be wound around the pipe connection part with a screw before the pipe is connected to the pipe connection part. There is a problem that the strength of the pipe connecting portion is considerably lowered due to cutting. In order to solve the above problems, a valve is provided at a connection port for connecting pipes, so that even if a pipe in which the fluid is received is separated, the fluid inside is prevented from leaking to the outside, and when the connection port is fastened, There is a pipe connection which can be connected and disconnected freely.

In addition, in the prior art Patent Document 10-2004-0084507, a connecting hole for connecting a pair of pipes is provided with a hollow tube body, a male screw portion is formed on one side or both sides thereof, And an outer pressing surface formed on an outer circumferential surface of the tube coupled to the insertion end and formed by an inclined surface of the outer circumferential surface to press the outer circumferential surface of the tube, And a female screw portion which is located on the outer peripheral surface of the pressing portion and which is coupled to the male screw portion formed on the outer peripheral surface of the pressing portion in such a shape as to accommodate the pressing portion is formed on the inner surface of the pressing portion, Wherein the fastening portion is provided with a fastening portion.

However, the conventional pipe connector as described above is not only complicated in structure but also has a disadvantage in that the airtightness of the pipe is reduced due to insufficient airtight action.

On the other hand, if the pipe is insufficiently inserted at the beginning of the pipe connection, there is a problem that the pipe is disengaged from the pipe connection port due to the internal pressure generated by the fluid used after the final connection or the used fluid leaks to the outside of the pipe connection port.

This is because it is impossible to confirm the insertion state of the pipe by the naked eye because the pipe connection pipe into which the pipe is inserted is not visible. To prevent this problem, an assembly instruction of pipe connection pipe is established, and in order to visually confirm the pipe insertion depth There is provided means such as marking indicating the position required outside the tube before inserting. However, it is difficult to completely block the problem due to a mistake such as a missing marking or an operator error due to manual work by a worker.

Therefore, there is an urgent need in the art to develop a technique for preventing such a problem from occurring in advance.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pipe joint device including a bushing which is simple in construction and excellent in airtightness, thereby greatly improving airtightness.

In addition, it is possible to recognize the complete insertion of the tube at the time of insertion of the tube by auditory or tactile sense, and to add a bushing which prevents the once inserted tube from being easily released from the inserted member even before the complete insertion, The present invention has been made in view of the above problems.

In order to accomplish the above object, according to the present invention, there is provided a method of manufacturing a pipe, comprising a cylindrical body fitted to an outer circumferential surface of a pipe, a cut portion formed at one side of the body so that the body is elastically fixed to an outer circumferential surface of the pipe, And a release preventing portion formed to prevent the escape by applying pressure to the tube.

In the present invention, the departure-avoiding portion may protrude toward the inside or outside of the body.

Meanwhile, the release preventing portion may include a release preventing piece formed by cutting the body and bending at a predetermined angle.

The release preventing member may have a shape such that one end thereof is connected to the body. When the release preventing member is protruded to the inside of the body, the one end may be formed in a direction in which the tube is inserted.

In addition, the release preventing member may be bent to an angle range of 5 to 15 degrees with respect to the body.

The separation preventing portion of the present invention may further include a cut-out hole in which the body is cut.

At least two or more deviation preventing portions may be formed on the body at regular intervals.

In the present invention, the angle formed by the incision portion about the central axis of the body may range from 1 to 45 degrees.

On the other hand, the release preventing pieces may be bent at a predetermined angle and then bent again to be bent in two stages.

In this case, the end portions bent in two stages of the anti-departure pieces may be rounded in the shape of an arc having a predetermined radius of curvature, or may be bent in the direction toward the body.

In addition, the departure prevention piece may be formed in two on the front end side and the rear end side of the body.

Meanwhile, the separation preventing portion may be formed by making the thickness of the tip portion of the body larger than the thickness of the rear end portion.

The separation preventing portion may be formed by bending or bending the distal end of the body inward or outward, and the angle formed by the end of the separation preventing portion with the body may be in a range of 30 ° to 60 °.

In the present invention, the body may be formed in a shape of a post-lightening narrowing shape that narrows from the front end portion to the rear end portion so as to be easily inserted into the tube and to be elastically fixed to the inner circumferential surface of the tube fitting portion in which the bush is inserted.

In order to accomplish the above object, the present invention provides a connector for a portable terminal, comprising: a body having at least one connecting portion for connecting a tube with a tip thereof inserted therein and having a male screw formed on an outer circumferential surface of the connecting portion; A nut that is formed with a female screw and is coupled to a connection portion of the body; a cylindrical body that is fitted to an outer circumferential surface of the tube; a cut portion formed at one side of the body to elastically fix the body to the outer circumferential surface of the tube; And a baffle including a baffle formed integrally with the baffle to prevent the baffle from escaping by applying pressure to the baffle.

Here, a sealing member may be further included to provide a hermetic function between the connection portion, the nut, and the pipe.

The body may be formed with a recess in which the bush is fitted in an inner circumferential surface of the connection portion so that the body is not released after the bush is inserted.

In the present invention, a body inclined surface may be formed at the inner diameter front end of the connection portion, and a sealing inclined surface may be formed on the entire surface of the sealing member so as to be coupled to the body inclined surface.

In addition, a body inclined surface may be formed at an inner diameter of the connecting portion, and the sealing member may include a first sealing member fitted to the body inclined surface and a second sealing member fitted to a rear surface of the first sealing member.

The first sealing member may have a first sealing front inclined surface formed on the front surface thereof so as to be coupled to the body inclined surface, a first sealing rear surface inclined surface formed on the rear surface thereof, and the second sealing member may be coupled to the first sealing rear surface inclined surface And a second sealing front inclined surface may be formed on the front surface thereof.

In this case, an inclined plane O-ring groove may be formed on the first sealing front inclined surface that contacts the body inclined surface, and an O-ring may be inserted into the inclined plane O-ring groove.

As described above, according to the present invention, it is possible to greatly improve airtightness by connecting the pipes with simple structure and excellent airtightness.

In addition, it is possible to recognize the complete insertion of the tube at the time of insertion of the tube by auditory or tactile sense, and to add a bushing which prevents the once inserted tube from being easily released from the inserted member even before the complete insertion, There is an effect of preventing occurrence.

1 is a perspective view showing an embodiment of a bush according to the present invention.
Fig. 2 is a front view of Fig. 1. Fig.
3 is a sectional view taken along line AA in Fig.
Figure 4 is an exploded perspective view of a pipe fitting to which an embodiment of the bush according to the present invention is applied.
FIGS. 5 to 7 are sectional views showing a state where the pipe jointing apparatus of the present invention is engaged, and are sectional views sequentially showing insertion and insertion of pipes into the pipe jointing apparatus.
8 is a cross-sectional view showing a case where a pipe of the maximum size is inserted into the pipe joint of the present invention.
9 to 14 are sectional views showing other embodiments of the bush applied to the pipe fitting of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. The structure and operation of the present invention shown in the drawings and described by the drawings are described as at least one embodiment, and the technical ideas and the core structure and operation of the present invention are not limited thereby.

FIG. 1 is a perspective view showing an embodiment of a bush according to the present invention, FIG. 2 is a front view of FIG. 1, and FIG. 3 is a sectional view taken along line A-A of FIG.

The bush 10 of the present invention is a part that is fitted to an end of a pipe when a pipe (pipe or tube) used for piping for transferring liquid or gas is connected. In the embodiment of the present invention, A cutout 14 formed at one side of the body 12 so that the body 12 is elastically fixed to an outer circumferential surface of the tube 12 and a body 12 integrally formed with the body 12, And a release preventing portion for preventing release by applying pressure to the tube.

The body 12 is a cylindrical member having both ends opened to fit through the tube, and is formed to have a predetermined width.

In the present invention, the body 12 is characterized in that a cutout 14 is formed at one side thereof.

The cutout portion 14 is formed by cutting the body 12 in the longitudinal direction of the tube. The cutout portion 14 allows the body 12 to have an elastic force that can be elastically fixed to the outer circumferential surface of the tube. .

The body 12 is elastically fixed to the outer circumferential surface of the tube so that the cut-out portion 14 needs to be limited in its forming range to hold the tube. As shown in FIG. 2, The angle (x DEG) formed by the incision portion 14 around the central axis of the body 12 may be formed to have an angle range of 1 to 45 degrees.

If the angle x of the incision 14 is less than 1 or more than 45, it may be difficult to apply elastic force to the outer circumferential surface of the tube, ) To be able to resist the fluid flow. Therefore, it is preferable that the angle (x) formed by the incision portion 14 around the central axis of the body 12 has an angle range of 1 to 45 degrees, but the present invention is not limited thereto, An angle of less than 1 DEG or more than 45 DEG is also possible depending on various conditions for effective insertion of the tube, such as the hardness, strength, material / mechanical properties of the body 12, or tolerances of the outer diameter.

At least two separation preventing portions are formed on the body 12 at regular intervals. In the embodiment of the present invention, the release preventing portion is formed of four pieces formed at regular intervals, but the present invention is not limited thereto, and may be formed in various numbers such as 2 to 6 pieces.

The separation preventing portion of the present invention is formed to protrude inward or outward of the body 12 to apply pressure to the tube by contacting the outer circumferential surface of the tube when inserting the tube and to prevent the tube from being separated by frictional force , Seven embodiments are presented in the present invention.

As shown in FIG. 1, the release preventing portion includes a release preventing piece 16 formed by cutting a part of the body 12 and bending at a predetermined angle.

The escape preventing pieces 16 formed as described above are integrally formed on the body 12 and have a predetermined elastic force, thereby holding the tube inserted into the bush 10.

The release preventing pieces 16 may have a shape of '┌┐', one end of which is connected to the body 12.

The release preventing pieces 16 may protrude toward the inside or the outside of the body 12. When the release preventing pieces 16 protrude inward of the body 12, The one end is formed.

When the tube is inserted, the release preventing member 16 resists the smooth insertion of the tube and permits insertion of the tube through elastic deformation. When the tube pushes the release preventing member 16 and is inserted, Lt; / RTI >

That is, when the worker joins the pipe, when the pipe is inserted into the bush 10 while pushing the departure prevention piece 16, an impact sound is generated or a shock vibration that a worker can feel is generated, It is possible to recognize the fully inserted by auditory or tactile sense.

Therefore, it is possible to completely prevent the occurrence of an error by allowing the tube to be completely inserted.

Further, after the pipe is inserted into the bush 10, the end of the departure prevention piece 16 comes into contact with the outer circumferential surface of the pipe to generate a frictional force, thereby preventing the pipe from coming off. Therefore, even if the pipe is not completely inserted due to inactivity of the worker, it is possible to prevent the pipe from being separated as much as possible.

When the release preventing piece 16 is protruded to the outside of the body 12, the one end may be formed in the direction in which the tube is inserted or in the opposite direction. In this case, the release preventing piece 16 is supported by the inner circumferential surface of the pipe connecting port into which the bush 10 is inserted, and the body 12 serves to hold the pipe.

In the present invention, the angle (?) In which the escape prevention piece (16) is bent may be formed within a range of 5 to 15 degrees with respect to the body (12).

The angle range of the departure prevention piece 16 is derived from the most suitable value as a result of a number of experiments by the present applicant. When the bent angle of the departure prevention piece 16 is less than 5 degrees, Insertion is easy but there is not enough pressure to prevent the tube from coming off. As the pipe is separated by a certain distance from the pipe connection before the start of work for final tightening, due to the internal pressure generated by the fluid after final tightening of the pipe The pipe may be detached from the pipe connection port or the fluid may leak to the outside.

However, the present invention is not limited thereto, and an angle less than that may be possible depending on the hardness or strength of the anti-departure piece.

On the other hand, when the angle of deviation 15 of the departure prevention piece 16 is 15 degrees or more, insertion of the pipe is not performed, so that it may be difficult for the operator to work. Therefore, it is preferable that the bending angle of the departure prevention piece 16 is 15 ° or less, but it is also possible that the angle is more than that according to the hardness or strength of the departure prevention piece or pipe.

The release preventing portion of the present invention may further include a cut-out hole 18 in which the body 12 is cut, and may be formed by press working.

Meanwhile, the body 12 may be formed in a shape of a post-lightening narrowing shape that becomes narrower from the front end to the rear end so as to be easily inserted into the tube and to be elastically fixed to the inner circumferential surface of the tube fitting hole in which the bush 10 is inserted .

7, the angle b ° formed by the front end portion and the rear end portion of the body 12 is in a range of 0.1 to 3 degrees relative to the horizontal plane, Of the total.

The bush 10 of the present invention having such a configuration is applied to a connector for connecting pipes.

Figure 4 is an exploded perspective view of a pipe fitting to which an embodiment of the bush according to the present invention is applied.

The pipe fitting 100 to which the bush 10 of the present invention is applied includes a body 110 having a connection part 112 inserted at the tip of the pipe 130 and connecting the pipe 130 to at least one side thereof, A nut 120 coupled to the connection part 112 of the body 110 and a bush 10 inserted into the inner circumferential surface of the connection part 112.

The body 110 is a union type in which two connecting portions 112 are formed in the left and right sides in a straight line direction and two pipes are respectively inserted in the left and right directions. A male screw is formed on the outer peripheral surface of the connecting portion 112, (120) is coupled to the connection part (112) of the body (110) by forming a female screw fastenable to the male screw.

The present invention is not limited to this. However, the present invention is not limited to this, but may be applied to an elbow connecting the two tubes in an inclined manner, a Tee connecting the three tubes, And it can be applied to a pipe joint connection applied to various devices such as control or measurement of a fluid flowing through a pipe and can be connected to the pipe joint connection device mentioned above.

In addition, the present invention is applicable to all pipe joints made of plastic, steel, and stainless steel. That is, the material of the body 110 and the nut 120 is not limited, and the material of the tube 130 is not limited.

The bush 10 of the pipe joint 100 of the present invention includes a cylindrical body 12 fitted to the outer circumferential surface of the tube 130 and a cylindrical body 12 fitted to the outer circumferential surface of the tube 130, An incision part 14 formed at one side of the body 12 so as to be elastically fixed to the body 12 and a departure prevention part formed integrally with the body 12 to prevent the separation of the tube 130 by applying pressure to the tube 130 do.

Here, the bush 10 is the same as the above-described embodiment, and a detailed description thereof will be omitted in order to avoid redundancy.

As shown in FIG. 5, the body 110 is formed with a concave portion in which the bush 10 is inserted, on an inner circumferential surface of the connection portion 112 so that the bush 10 is not released.

When the tube 130 is removed after the nut 120 is loosened for the re-tightening, the bush 10 is prevented from coming out together with the bush 10 so that the bush 10 is inserted into the inner circumferential surface of the connection part 112 And is formed by undercut processing to a predetermined depth. Therefore, the diameter of the concave portion (Dbody-undercut) is larger than the diameter of the bushing (10) and the diameter of the inlet (110) of the body (110).

The pipe fitting of the present invention may further include a sealing member 140 (150) that hermetically acts between the connection portion 112, the nut 120 and the pipe 130.

The sealing members 140 and 150 may include a first sealing member 140 and a second sealing member 150. In order to couple the body 110 and the first sealing member 140, A body sloping surface 114 is formed at an inner diameter front end of the connection part 112. A first sealing front sloping surface is formed on the front surface of the first sealing member 140 so as to be coupled to the body sloping surface 110, And a second sealing front inclined surface is formed on the front surface of the second sealing member 150 so as to be coupled to the first sealing rear surface inclined surface.

In addition, an inclined plane O-ring groove (not shown) is formed on the first sealing front inclined surface that contacts the body inclined surface 114, and an O-ring can be inserted into the inclined plane O-ring groove.

Preferably, the O-ring material is made of VITON.

The pipe joint of the present invention has a simple structure in which the first sealing member 140 with the O-ring interposed therebetween and the connecting portion 112, the nut 120 and the pipe 130 are easily separated by the second sealing member 150 There is a remarkable effect that the airtight action can surely be performed.

A method of inserting a tube into the pipe joint apparatus of the present invention having such a structure and finally connecting the pipe joint will be described as follows.

FIGS. 5 to 7 are sectional views showing a state where the pipe jointing apparatus of the present invention is engaged, and are sectional views sequentially showing insertion and insertion of pipes into the pipe jointing apparatus.

The nut 120 is assembled in a state where the bush 10, the first sealing member 140 and the second sealing member 150 are fitted to the inner circumferential surface of the connecting portion 112 of the body 110, ) Is inserted.

When the tube 130 contacts the release preventing piece 16, the release preventing piece 16 resists smooth insertion of the tube and allows an insertion of the tube through elastic deformation while causing an impact sound or shock vibration, Is completely inserted into contact with the body 12 of the bush 10.

Thus, when the worker connects the pipe 130, it is possible to recognize that the pipe 130 is completely inserted by the auditory or tactile sense.

When the insertion of the tube 130 is completed, the nut 120 is tightened and completely fastened.

FIG. 7 is a cross-sectional view showing a state in which a tube of the standard size is fully inserted, and FIG. 8 is a sectional view showing a case where a tube of the maximum size is inserted into the tube fitting of the present invention.

As shown, the bush 10 of the present invention has the release preventing pieces 16 protruding by a predetermined amount and the body 12 is formed to be inclined at a predetermined angle b °, 10) of the same diameter as the inner diameter of the tube.

7, the tube 130 is brought into contact with the release preventing piece 16 so that the bush 10 catches the tube 130, 8, the release preventing pieces 16 are slightly pushed outwardly to hold the tube 130. As shown in FIG.

9 to 14 are sectional views showing other embodiments of the bush applied to the pipe joint of the present invention.

In the present invention, various embodiments are provided in configuring the departure prevention portion.

9 to 11 illustrate embodiments in which the departure prevention portion is composed of the departure prevention pieces 36, 46 and 56 and the departure prevention pieces 36, 46 and 56 are bent at a predetermined angle And then folded again to form two steps.

In FIG. 9, the two end portions of the release preventing pieces 36 are formed so as to have an angle parallel to the pipe 130.

Also, as shown in FIG. 10, the end portions bent in two stages of the release preventing pieces 46 may be rounded in the shape of an arc having a predetermined radius of curvature.

In addition, the end portions bent in two stages of the release preventing pieces 56 may be bent in the direction toward the body. In this case, when the tube 130 is inserted, the surface of the tube 130 which presses the tube 130 is sharp, so that the frictional force can be increased.

Also, as shown in FIG. 12, the separation preventing portion may be formed by varying the thickness of the body 24. That is, the front end thickness t1 of the body 24 may be made larger than the rear end thickness t2.

In this case, when the tube 130 is inserted into the bush 20, a pressure is applied to press the tube 130, so that the tube 130 can be prevented from coming off.

Also, as shown in FIG. 13, the separation preventing portion 66 may be formed by bending or bending the tip of the body inwardly or outwardly.

In this case, the angle formed between the end portion 66 of the release preventing portion and the body may be in the range of 30 to 60 degrees. In this case, when the tube 130 is inserted into the bushing 60, It is possible to prevent the tube 130 from being released.

Also, as shown in FIG. 14, the release preventing pieces 72 and 74 may be formed in two at the front end and the rear end of the body. In this case, the escape preventing pieces 72 and 74 may be bent in two stages. The two ends of the escape preventing pieces 72 and 74 may be bent to be parallel to the tube 130 Or may be rounded in the shape of an arc having a predetermined radius of curvature, or may be bent in a direction toward the body. In this case, when the tube 130 is inserted, the surface of the tube 130 which presses the tube 130 is sharp, so that the frictional force can be increased.

In addition, it is preferable that the inner diameter of the departure prevention pieces 72 and 74 are different from each other so that even if the diameters of the inserted pipes are different, they can serve as bushes.

That is, when d1 is the inner diameter of the departure prevention member 74 formed at the distal end of the bush and d2 is the inner diameter of the departure prevention member 72 formed at the rear end of the bush, d1 is made larger than d2, But also the tube of the same diameter as the inner diameter of the bush.

When a pipe of the standard size is inserted, the tube is contacted to the departure prevention piece 72 having a smaller inner diameter d2 to hold the tube. When the tube of the maximum size is inserted, the release piece 72 And a departure prevention piece 74 having a larger inner diameter d1 together with the above-mentioned diaphragm 74 catch the tube.

The above description is only illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. It should be noted that the embodiments disclosed in the present invention are not intended to limit the scope of the present invention and are not intended to limit the scope of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas falling within the scope of the same shall be construed as falling within the scope of the present invention.

10: Bush 12: Body
14: incision part 16:
110: Body 112: Connection
114: body slope 120: nut
140: first sealing member 150: second sealing member

Claims (7)

A body having at least one connecting portion for connecting the tube with the tip of the tube inserted therein and having a male screw formed on an outer circumferential surface of the connecting portion;
A nut having a female screw fastened to the male screw and coupled to a connecting portion of the body; And
A cutout portion formed at an angle ranging from 1 to 45 degrees about a center axis of the body so as to be elastically fixed to the outer circumferential surface of the tube; A bush comprising at least two or more bushings spaced apart from each other to prevent the bushing from escaping by applying pressure to the bushing;
Lt; / RTI >
The body is formed in a shape of an optical fiber after being narrowed from the front end portion to the rear end portion so as to be easily inserted into the tube and to be elastically fixed to the inner circumferential surface of the tube fitting hole in which the bush is inserted,
Wherein the body is formed with an inner circumferential surface of the connecting portion so as to prevent the bush from being released after the bush is inserted,
The release preventing part includes an escape preventing part formed by cutting a part of the body so that one end thereof is connected to the body and bent to an angle range of 5 to 15 degrees with respect to the body,
Wherein the one end is formed in a direction in which the tube is fitted when the release preventing member is protruded to the inside of the body. A body having at least one connecting portion for connecting the tube with the tip of the tube inserted therein and having a male screw formed on an outer circumferential surface of the connecting portion;
A nut having a female screw fastened to the male screw and coupled to a connecting portion of the body; And
A cutout portion formed at an angle ranging from 1 to 45 degrees about a center axis of the body so as to be elastically fixed to the outer circumferential surface of the tube; A bush comprising at least two or more bushings spaced apart from each other to prevent the bushing from escaping by applying pressure to the bushing;
Lt; / RTI >
The body is formed in a shape of an optical fiber after being narrowed from the front end portion to the rear end portion so as to be easily inserted into the tube and to be elastically fixed to the inner circumferential surface of the tube fitting hole in which the bush is inserted,
Wherein the body is formed with an inner circumferential surface of the connecting portion so as to prevent the bush from being released after the bush is inserted,
The release preventing part includes a release preventing part formed by cutting a part of the body so that one end thereof is connected to the body and then bent at a predetermined angle and then bent again to be bent in two stages, Wherein the end portions bent in two stages of the prevention pieces are rounded in the shape of an arc having a predetermined radius of curvature. A body having at least one connecting portion for connecting the tube with the tip of the tube inserted therein and having a male screw formed on an outer circumferential surface of the connecting portion;
A nut having a female screw fastened to the male screw and coupled to a connecting portion of the body; And
An incision part formed at an angle of 1 to 45 degrees around the central axis of the body so that the body is elastically fixed to the outer circumferential surface of the tube; A bush comprising: a bush which is formed with a separation preventing part for preventing pressure by applying pressure to the tube;
Lt; / RTI >
The body is formed in a shape of an optical fiber after being narrowed from the front end portion to the rear end portion so as to be easily inserted into the tube and to be elastically fixed to the inner circumferential surface of the tube fitting hole in which the bush is inserted,
Wherein the body is formed with an inner circumferential surface of the connecting portion so as to prevent the bush from being released after the bush is inserted,
Wherein the separation preventing portion is formed by bending or bending the tip portion of the body inside or outside, wherein the angle formed by the end portion of the separation preventing portion with the body is in the range of 30 to 60 degrees. The method according to any one of claims 1 to 3,
Further comprising a sealing member that hermetically acts between the connecting portion, the nut and the tube,
A body inclined surface is formed at an inner diameter front end of the connecting portion,
Wherein the sealing member is formed with a sealing inclined surface at its front surface so as to be coupled to the body inclined surface. The method according to any one of claims 1 to 3,
Further comprising a sealing member that hermetically acts between the connecting portion, the nut and the tube,
A body inclined surface is formed at an inner diameter front end of the connecting portion,
Wherein the sealing member comprises a first sealing member fitted to the body inclined surface and a second sealing member fitted to a rear surface of the first sealing member. The method of claim 5,
The first sealing member has a first sealing front inclined surface formed on a front surface thereof so as to be coupled to the body inclined surface, a first sealing rear surface inclined surface formed on a rear surface thereof,
And the second sealing member is formed with a second sealing front inclined surface on its front surface so as to be coupled to the first sealing rear surface inclined surface. The method of claim 6,
Wherein an inclined plane O-ring groove is formed in the first sealing front inclined face that is in contact with the body inclined face, and an O-ring is inserted into the inclined plane O-ring groove.

Images