JP2001173863A - One-step coupler for flexible tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a one-step coupler for a flexible tube in simple constitution. SOLUTION: A flexible tube 1 is constituted of a corrugate pipe 13 furnished with a plural number of crest parts 15 and trough parts 16. This flexible tube 12 passes through a retainer 4, enters an inner peripheral part of a sealant 5 and adheres to it as the corrugate pipe 13 is inserted toward the inside of a stopper ring 3 and a cylindrical main body 2 from an end part of the stopper ring 3. The retainer 4 is constituted of a ring body split in one in the peripheral direction, elastically extended in diameter by the crest parts 15 when the crest parts 15 of the corrugate pipe 13 pass inside, elastically contracted in diameter and can be hooked on both of the corrugate pipe 13 inserted inside and an inner peripheral taper surface 6 of the stopper ring 3.

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 As a one-touch joint of this type, for example, Japanese Patent Application No. 10-291230, a snap ring is screwed into a main body of a joint, and an annular sealing material is arranged inside the main body. It is known that an annular retainer is disposed between a sealing material inside and an inner peripheral tapered surface at a distal end portion of a retaining ring.

[0003] In such a one-touch joint, a flexible tube constituted by a corrugated pipe having a plurality of peaks and valleys is connected to an opening at an end of the retaining ring to connect the retaining ring to the main body. The corrugated tube constituting the flexible tube pushes and expands the retainer, passes through the retainer, and enters the inside of the sealing material to be in close contact with the inner peripheral surface thereof. This seals between the joint and the corrugated tube.
When the peak of the corrugated pipe passes, the retainer elastically contracts and returns to its original state, and engages with the valley of the corrugated pipe. At this stage, the joining of the flexible tube to the joint is completed.

In the retainer, cuts from one end to the other end are formed at a plurality of positions along the circumferential direction so that such diameter expansion and diameter reduction can be easily performed. In this state, when a pull-out force from the joint acts on the flexible tube, the retainer contacts the inner peripheral taper surface of the retaining ring, thereby receiving a diameter reducing force from the inner peripheral taper surface,
This ensures that the retainer and the corrugate tube are securely engaged with each other, and prevents the flexible tube from coming out of the joint.

[0005]

In the one-touch joint for a flexible tube having such a structure, as described above, the retainer has cuts at a plurality of positions along the circumferential direction, and therefore cannot be said to be simple. It has a configuration. Therefore, an object of the present invention is to enable a one-touch joint for a flexible tube to be realized with a simple configuration.

[0006]

SUMMARY OF THE INVENTION In order to achieve this object, the present invention provides a cylindrical main body and an inner periphery having a distal end mounted inside the cylindrical main body and having a diameter increasing toward the distal end side. A retaining ring having a tapered surface, an annular sealing material provided inside the tubular main body, and an inner peripheral tapered surface of the retaining ring and the sealing material disposed inside the tubular main body. An annular retainer, wherein the flexible tube has a corrugated tube having a plurality of peaks and valleys inserted from an end of the retaining ring toward the inside of the retaining ring and the cylindrical body. By doing so, it is configured to pass through the retainer and enter the inner peripheral portion of the sealing material to be in close contact, the retainer is configured by a circumferentially divided annular body,
The corrugated tube is configured to be elastically expanded by the crest when the crest passes through the inside,
It is designed to be able to engage both the corrugated pipe inserted therein and the inner peripheral tapered surface of the retaining ring.

In such a configuration, since the retainer is constituted only by a circumferentially divided annular body, its structure is relatively simple, and therefore, the structure of the entire joint is also simple. Becomes

[0008]

FIG. 1 shows a one-touch joint for a flexible tube according to an embodiment of the present invention. This one-touch joint 1 has a metal tubular body 2 and a metal retaining ring 3 whose tip is screwed into the inside of the tubular body 2.
An annular metal retainer 4 and an annular rubber seal member 5 are arranged inside the cylindrical main body 2. The distal end of the retaining ring 3 is formed with an inner peripheral tapered surface 6 whose diameter increases toward the distal end side. The seal member 5 is mounted on the inner periphery of the cylindrical main body 11, and the retainer 4 is attached to the inner peripheral taper surface 6 of the retaining ring 3.
It is provided in a state that it can be elastically expanded in diameter and can move in the axial direction between the seal member 5 and the end face 7 of the sealing material 5.

FIG. 2 shows the entire structure of the retainer 4. The retainer 4 is formed by an annular body divided in a circumferential direction as shown in the figure, and is capable of elastically expanding and reducing the diameter within a certain range. As shown in FIGS. 1 and 2, on the outer periphery of the retainer 4,
A tapered surface 8 that can be in contact with the inner peripheral tapered surface 6 of the retaining ring 3 is formed. A tapered surface 9 is formed on the inner periphery of the retainer 4, the diameter of which gradually decreases toward the inner side of the cylindrical body 2 along the axial direction. 10
Is a front end surface of the retainer 4, and the front end surface 10 and the tapered surface 9
Sharp edge 11 formed by the intersection with
Are formed along the circumferential direction.

The flexible tube 12 connected to the joint 1 has a structure in which a thin metal corrugate tube 13 is covered with a resin covering 14. Reference numeral 15 denotes a peak of the corrugated tube 13, and 16 denotes a valley thereof. In such a configuration, when forming the joint 1, first, the sealing material 5 is fitted into the cylindrical main body 2 in a state where the retaining ring 3 is not mounted, and then the retainer 4 is inserted into the cylindrical main body 1. Then, the distal end of the retaining ring 3 is screwed into the tubular main body 2 and mounted.

Next, the flexible tube 12 with the covering 14 removed from the several peaks of the corrugated pipe 13 is removed from the end of the retaining ring 3 and the retaining ring 3 and the retainer 4.
And the sealing material 5. Then, first, as shown in FIG.
Hits the tapered surface 9 on the inner periphery of the retainer 4, and presses the distal end surface 10 of the retainer 4 against the end surface 7 of the sealing material 5.
Then, when an insertion force is further applied to the corrugated pipe 13, the crest 15 at the tip of the corrugated pipe 13 acts on the tapered surface 9 on the inner periphery of the retainer 4. Is elastically pushed open. Thereby, the crest 1 at the tip of the corrugated tube 13
5 passes through the retainer 4, and the ridge 15 enters the inside of the sealing material 5. Similarly, when a certain number of peaks 15 pass through the retainer 4, these peaks 15 are
Get inside.

FIG. 1 shows a state at this time, that is, a state in which the joining of the flexible tube 12 to the joint 1 is completed. At this time, the retainer 4 has an inner peripheral edge 11 at the tip of the corrugated tube 13 having a valley. It enters the part 16 and becomes in a state of being engaged. As shown in FIG. 5, when a pull-out force from the joint 1 is applied to the flexible tube 12 after the pipe is installed, the peak portion 15 of the corrugated tube 13 engages with the edge portion 11 of the retainer 4, and the retainer 4 is moved around its outer periphery. Is engaged with the inner peripheral tapered surface 6 of the retaining ring 3. As a result, the retainer 4 receives a diameter reducing force by the inner peripheral tapered surface 6 of the retaining ring 3, and acts so that the edge portion 11 bites into the corrugated tube 13. As a result, the flexible tube 12 is securely prevented from coming out of the joint 1.

As described above, the flexible tube 12 is joined to the joint 1 and the flexible tube 12 is prevented from coming out of the joint 1 by reducing and expanding the diameter of the retainer 4. Since the structure is formed only by the metal annular body divided in one direction, it has an advantage that its structure is simple, and therefore, the overall structure of the joint 1 is also simple.

[0014]

As described above, according to the present invention, a cylindrical main body and an inner peripheral taper surface whose tip is mounted inside the cylindrical main body and whose diameter increases toward the distal end are formed. A retaining ring, an annular sealing member provided inside the cylindrical main body, and an annular retainer disposed between the inner peripheral tapered surface of the retaining ring and the sealing material inside the cylindrical main body. Provided, the flexible tube is a corrugated tube having a plurality of peaks and valleys, by being inserted from the end of the retaining ring toward the inside of the retaining ring and the cylindrical body, It is configured to pass through the retainer and enter the inner peripheral portion of the sealing material so as to be in close contact therewith, and the retainer is configured by a circumferentially-divided annular body, and when a corrugated pipe mountain passes through the inside. Constructed to be elastically expanded by this peak As well as being able to engage both the corrugated pipe inserted inside and the inner peripheral tapered surface of the retaining ring, the retainer is a circumferentially split annular body as described above. And thus a relatively simple structure, so that the overall structure of the joint can also be simple.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a one-touch joint for a flexible tube according to an embodiment of the present invention.

FIG. 2 is a perspective view of a retainer in FIG.

FIG. 3 is a view showing a state when a flexible tube is joined to the joint of FIG. 1;

FIG. 4 is a diagram showing the next stage of FIG. 3 at the time of joining.

FIG. 5 is a view showing a state in which a pull-out force of a flexible tube acts on the joint of FIG. 1;

[Explanation of symbols]

 2 Cylindrical main body 3 Retaining ring 4 Retainer 5 Sealing material 13 Corrugate pipe 15 Mountain part 16 Valley part

 ──────────────────────────────────────────────────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 Kazura Kariki 2-10-16 Minamikagaya, Suminoe-ku, Osaka-shi, Osaka F-term in Shinwa Sangyo Co., Ltd. 3H017 CA05 3J106 AA02 AA04 AB09 BA01 BB01 BC01 BD01 BE11 BE32 CA16

Claims (1)

[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 material provided inside the cylindrical body, and an annular retainer disposed between the inner peripheral tapered surface of the retaining ring and the seal material inside the tubular main body. The corrugated pipe having the crests and the valleys is inserted from the end of the retaining ring toward the inside of the retaining ring and the tubular main body, so that the corrugated pipe passes through the retainer and seals the sealing material. The retainer is constituted by an annular body divided in the circumferential direction, and is elastically expanded by the peak when the peak of the corrugate tube passes through the inside. And inserted inside One-touch fitting for a flexible tube, characterized in that it is capable involvement in both the inner peripheral tapered surface of the been Korugeito tube and retaining ring.