JP2001108172A - Single-operated joint for flexible tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately confirm an insufficient insertion of a corrugated tube in a joint in a single-operated joint for a flexible tube formed by a corrugated tube. SOLUTION: In this flexible tube 20, a corrugated tube 21 having plural crest parts 23 and valley parts 24 is inserted from the end of a stop ring 3 toward the interiors of the stop ring 3 and a cylindrical main body 2, thereby spreading a retainer 4 so that it passes through the retainer 4 and enters the inner peripheral part of a seal material 5 to come into close contact with the seal material. The seal material 5 has a region 21 which will not seal between the inner periphery of the seal material 5 and the outer periphery of the corrugated tube 21 when one crest part at the tip of the corrugated tube 21 passes through the retainer 4 to enter the inside of the seal material 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-touch joint for a flexible tube, and more particularly to a one-touch joint for a flexible tube formed of a corrugated tube used for gas piping and the like.

[0002]

2. Description of the Related Art For example, Japanese Patent Application No. 11-258152 discloses a so-called one-touch joint which can be joined simply by inserting a flexible tube, and has a structure shown in FIG. One-touch joint 1 shown in FIG.
Has a metal tubular body 2 and a metal retaining ring 3 whose tip is screwed into the tubular body 2, and an annular metal retainer 4 is provided inside the tubular body 2. And an annular rubber seal member 5 are arranged. At the tip of the retaining ring 3,
An inner peripheral tapered surface 6 whose diameter increases toward the distal end side is formed. The seal member 5 is mounted on the inner periphery of the cylindrical main body 11, and the retainer 4 elastically expands in diameter between the inner peripheral tapered surface 6 of the retaining ring 3 and the end surface 7 of the seal member 5 and extends in the axial direction. It is provided in a movable state. A resin washer 8 is interposed between the retainer 4 and the end face 7 of the sealing material 5.

FIGS. 6 and 7 show the entire structure of the sealing material 5. FIG. The seal member 5 is formed by integrating a refractory portion 11 located on the back side of the tubular main body 2 and a normal rubber portion 12 located on the opening side of the tubular main body 2 with respect to the refractory portion 11 in the axial direction. Configuration. Further, in the sealing material 5, a tapered surface 13 having a small diameter on the distal end side is formed on the outer periphery of the refractory portion 11. In addition, round portions 14 and 15 are formed on the outer peripheral edge of the refractory portion 11 and the inner peripheral edge of the ordinary rubber portion 12, respectively. Instead of the round portions 14 and 15, chamfers having the same size can be formed. A portion of the sealing material 5 on the back side of the ordinary rubber portion 12, specifically, the refractory portion 1
An inner peripheral projection 16 is formed integrally with a portion of the normal rubber portion 12 at or near a boundary between the first rubber portion 1 and the normal rubber portion 12. The inner peripheral protrusion 16 is formed in a certain range along the inner periphery of the ordinary rubber portion 12 as shown in the figure.

The flexible tube 20 connected to the joint 1 has a structure in which a thin metal corrugated tube 21 is covered with a resin covering 22. 23 is a peak of the corrugated tube 21, and 24 is its valley. In such a case, when forming a joint, first, the retaining ring 3
The seal member 5 is fitted into the tubular main body 2 in a state where is not mounted. At this time, since the tapered surface 13 and the round portion 14 are formed at the tip of the sealing material 5, the fitting operation can be easily performed. Next, the washer 8 and the retainer 4 are inserted into the cylindrical main body 2, and then the retaining ring 3 is screwed into the cylindrical main body 2 and mounted.

[0005] Next, the flexible tube 20 with the coating 22 removed from the several peaks of the corrugated pipe 21 is removed from the end of the retaining ring 3 and the retaining ring 4 and the retainer 4.
And the sealing material 5. Then, the peak 23 of the tip of the corrugated pipe 21 first hits the retainer 4, and the retainer 4 is attached to the sealing material 5 through the washer 8.
Is pressed against the end surface 7. And furthermore the corrugated tube 21
When an insertion force is applied to the corrugated pipe 21, the crest 23 at the tip of the corrugated pipe 21 elastically pushes and expands the retainer 4 to pass through the retainer 4. Go inside 5. At this time, since the round portion 15 is formed on the inner periphery of the sealing material 5,
The sealing material 5 can easily enter the inside.

When the plurality of peaks 23 of the corrugated pipe 21 pass through the retainer 4 in this manner, the peaks 2 at the tip end thereof.
3 reaches the inner peripheral projection 16 of the sealing material, and
Hit 6 Since the insertion work of the corrugated pipe 21 up to now is performed manually by the operator, the operator receives a response at that time when the tip crest 23 hits the inner peripheral projection 16 in this manner. Thereafter, when an insertion force is further applied, the crest 23 at the tip of the corrugate tube 21 becomes
6 passes through the inside while elastically pushing it away.
As shown in FIG. As a result, the response described above disappears, and it is confirmed that the corrugated tube 21 has been inserted to the required position in the joint 1.

[0007]

However, when the insertion resistance when inserting the corrugated pipe 21 into the retainer 4 and the sealing material 5 is large to some extent, as shown in FIG. At the point of time just passing through the retainer 4 and entering the end of the ordinary rubber portion 12 of the sealing material 5, the resistance when passing through the retainer 4 is eliminated,
Further, since the space between the sealing material 5 and the corrugate tube 21 is appropriately sealed, the operator may mistakenly think that the insertion operation has been completed.

However, in such a case, after a certain time has passed since the pipe was constructed, as shown in FIG.
When the force F from the joint 1 is applied to the retainer 4, the retainer 4 is released within a range until the retainer 4 reaches the inner peripheral tapered surface 6 of the retaining ring 3.
1, the corrugated tube 21 may be completely separated from the sealing material 5 as shown in the figure, and unexpected gas leakage may occur.

SUMMARY OF THE INVENTION It is an object of the present invention to solve such a problem and to make it possible to confirm that the insertion of the corrugated tube is insufficient.

[0010]

In order to achieve the above object, a one-touch joint for a flexible tube according to the present invention comprises a tubular main body and a distal end mounted inside the tubular main body and facing the distal end side. A retaining ring formed with an inner peripheral tapered surface that expands in diameter, an annular sealing member provided inside the cylindrical main body, and a tapered surface of the retaining ring and the sealing material provided inside the cylindrical main body. An annular retainer is disposed on the flexible tube, and the flexible tube has a corrugated tube having a plurality of peaks and valleys, and an inner portion of the retaining ring and the cylindrical body from an end of the retaining ring. , So that the retainer is expanded so as to extend the retainer, pass through the retainer, enter the inner peripheral portion of the seal material, and come into close contact with each other. Passes through the retainer When entering into the inside of the sealing material is obtained by configured to have a site that does not seal between the outer periphery of the inner and Korugeito tube of the seal member.

The seal material for a one-touch joint for a flexible tube of the present invention is an annular seal material used for a one-touch joint for a flexible tube formed of a corrugated tube, wherein the one-touch joint is: A tubular body, a tip mounted inside the tubular body, a retaining ring formed with an inner peripheral tapered surface that expands in diameter toward the distal end side, and provided inside the tubular body. Annular seal material, comprising an annular retainer disposed between the tapered surface of the retaining ring and the seal material inside the cylindrical body, the flexible tube has a plurality of peaks and valleys Is inserted from the end of the retaining ring toward the inside of the retaining ring and the tubular main body, thereby expanding the retainer, passing through the retainer, and passing through the retainer. The sealing material is configured so as to penetrate into the inner peripheral portion of the sealing material so as to be in close contact therewith. And a portion that does not seal between the outer periphery of the corrugated tube.

Therefore, according to the present invention, the sealing material is
When one mountain of the tip of the corrugated pipe passes through the retainer and enters the inside of the sealing material, it has a portion that does not seal between the inner circumference of the sealing material and the outer circumference of the corrugating pipe. The outer periphery of the corrugated tube cannot be completely sealed at the stage where only one mountain has passed through the retainer. For this reason, if the insertion work of the corrugated pipe is stopped at this stage, the gas leaks immediately when gas is passed thereafter, and it is immediately and definitely confirmed that the insertion of the corrugated pipe is incomplete. can do.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 4 where the same members as those shown in FIGS. Will be described. As shown in FIGS. 1 and 2, a large-diameter portion 27 having a diameter larger than a predetermined inner peripheral portion 26 of the ordinary rubber portion 12 is formed on the inner periphery of the opening of the ordinary rubber portion 12 in the sealing material 5. It is formed in a certain range along the axial direction. The inner diameter of the large diameter portion 27 is formed to be slightly larger than the outer diameter of the peak portion 23 of the corrugated tube 21, so that the large diameter portion 27 is configured not to seal the outer periphery of the corrugated tube 21.
The inner peripheral part 26 and the large diameter part 27 are connected to each other by a tapered part 28. By forming the large diameter portion 27 in this manner, the sealing material 5 is in a stage where only one peak 23 of the tip of the corrugated pipe 21 has passed through the retainer 4 as shown in FIG. It is configured not to completely seal the outer periphery of 21.

According to such a configuration, the seal member 5 has the large-diameter portion 27 at the stage where only one peak 23 at the tip of the corrugate tube 21 has passed through the retainer 4 as described above. If the perimeter of the corrugated tube 21 is not completely sealed, and the insertion operation is stopped at this stage by mistakenly assuming that the insertion of the corrugated tube 21 is completed,
Thereafter, when gas is passed, gas leakage occurs immediately. Therefore, it is possible to immediately and definitely confirm that the insertion of the corrugated tube 21 is incomplete.

In order to completely insert the corrugated tube 21 into the inside of the sealing material 5, the insertion operation is further continued from the state shown in FIG. Then, the corrugated tube 21 is guided by the tapered portion 28 of the sealing material 5, enters the inner peripheral portion 26, and is further inserted to pass through the inner peripheral protruding portion 16 and to the inner periphery of the refractory portion 11. Get in. That is, since the large-diameter portion 27 is formed in a certain range along the axial direction as described above, unless the corrugated tube 21 enters the seal material 5 beyond the retainer 4 by a certain number of peaks or more.
The space between the corrugated tube 21 and the sealing material 5 is not completely sealed. As a result, it is ensured that the corrugated pipe 21 enters the inside of the sealing material 5 for a certain length or more, and therefore, it is ensured that unexpected gas leakage occurs at a time after completion of the construction as described above. Can be prevented.

It should be noted that even if a large chamfered portion is formed only by the tapered portion 28 without forming the large diameter portion 27,
Similarly, gas leakage can be generated at a stage where only one peak 23 of the tip of the corrugated tube 21 has passed through the retainer 4. However, in that case, the end face 7 of the sealing material 5
It should be noted that the area of the retainer 4 may be too small, and the backup when the retainer 4 is expanded by inserting the corrugated tube 21 may be insufficient. That is, at this time, the retainer 4 may fall down, or in an extreme case, the retainer 4 may enter the inner peripheral portion of the sealing material 5 together with the washer 8.

3 and 4 show another embodiment of the present invention. Here, instead of forming the large-diameter portion 27 on the entire circumference as in the embodiment of FIGS. 1 and 2, the inner surface of the seal material 5 is formed only at an appropriate place along the circumferential direction of the seal material 5. A notch 29 in the axial direction extending to the end face 7 of the sealing material 5 is formed. In the portion where the notch 29 is formed, the sealing material 5 and the corrugated pipe 2 inserted therein are arranged along the axial direction of the sealing material 5.
1 is designed so that the seal between them is insufficient.

Therefore, the notch 29 also
One of the peaks 23 at the tip of the corrugated tube 21 is the retainer 4
Gas leakage can be caused only at the stage where the gas has passed through. When the notch 29 is formed only at an appropriate position in the circumferential direction, the area of the end face 7 of the sealing material 5 can be sufficiently secured in a portion where the notch 29 is not formed. Therefore, the retainer 4 can be sufficiently backed up, and the fall of the retainer 4 and the intrusion of the retainer 4 into the inner peripheral portion of the seal member 5 can be reliably prevented.

[0019]

As described above, according to the present invention, the inner periphery of the sealing material and the corrugated pipe when the tip of the corrugated pipe passes through the retainer and enters the inside of the sealing material. Since there is a portion that does not seal the outer periphery of the corrugated tube, the outer periphery of the corrugated tube cannot be completely sealed at a stage where only one peak of the corrugated tube has passed through the retainer. For this reason, if the insertion work of the corrugated pipe is stopped at this stage, the gas leaks immediately when gas is passed thereafter, and it is immediately and definitely confirmed that the insertion of the corrugated pipe is incomplete. can do.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a one-touch joint for a flexible tube according to an embodiment of the present invention.

FIG. 2 is an overall view of a sealing material in FIG.

FIG. 3 is an overall view of a sealing material according to another embodiment of the present invention.

FIG. 4 is a side view of the sealing material of FIG. 3;

FIG. 5 is a partially cutaway overall view of a conventional one-touch joint for a flexible tube.

FIG. 6 is a side view of the sealing material in FIG.

FIG. 7 is an overall sectional view of the sealing material of FIG. 6;

FIG. 8 is a sectional view of a main part showing a state when a flexible tube is inserted into the joint of FIG. 5;

FIG. 9 is a diagram showing a state when a pull-out force acts on the flexible tube from the state of FIG. 8;

[Explanation of symbols]

 2 Cylindrical body 3 Retaining ring 4 Retainer 5 Sealing material 20 Flexible tube 21 Corrugate tube 23 Mountain part 27 Large diameter part 29 Notch

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshio Shibuchi 2-10-16 Minamikagaya, Suminoe-ku, Osaka-shi, Osaka Inside Shinwa Sangyo Co., Ltd. (72) Mikio Nakaoka Minamikagaya, Suminoe-ku, Osaka-shi, Osaka 2-10-16 Shinwa Sangyo Co., Ltd. (72) Inventor Kazuki Kariki 2-10-16 Minamikagaya, Suminoe-ku, Osaka-shi, Osaka F term in Shinwa Sangyo Co., Ltd. (reference) 3H017 CA11

Claims (2)

[Claims] 1. A tubular body, a retaining ring having a distal end mounted inside the cylindrical main body and having an inner peripheral tapered surface expanding in diameter toward the distal end side, and the cylindrical main body. An annular seal member provided inside the cylindrical body, and an annular retainer disposed between the tapered surface of the retaining ring and the seal member inside the tubular main body, wherein the flexible tube has a plurality of peaks. A corrugated tube having a portion and a valley is inserted from the end of the retaining ring toward the inside of the retaining ring and the tubular main body, thereby expanding the retainer and passing through the retainer. And it is comprised so that it may penetrate into the inner peripheral part of the said sealing material, and may be closely contacted, The said sealing material, when one peak of the tip of a corrugate pipe passes through a retainer and enters the inside of this sealing material, Seal between the inner circumference and the outer circumference of the corrugated tube. One-touch fitting for a flexible tube and having a portion which is not Le. 2. An annular sealing material used for a one-touch joint for a flexible tube constituted by a corrugated tube, wherein the one-touch joint has a cylindrical main body and a tip portion provided inside the cylindrical main body. A retaining ring that is mounted and has an inner peripheral taper surface that expands in diameter toward the distal end thereof; an annular sealing member provided inside the cylindrical body; and a stop ring inside the cylindrical body. An annular retainer disposed between the tapered surface of the ring and a sealing material, wherein the flexible tube has a corrugated pipe having a plurality of peaks and valleys, and the end of the retaining ring has a By being inserted toward the inside of the retaining ring and the tubular main body, the retainer is configured to be pushed out and spread, pass through the retainer, enter the inner peripheral portion of the sealing material, and come into close contact with each other; The material is A flexible tube having a portion that does not seal between the inner periphery of the seal material and the outer periphery of the corrugate tube when one tip of the rugate tube passes through the retainer and enters the inside of the seal material. Material for one-touch fittings.