JPH11230440A - Loose-out preventing device for fluid tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the working and assembling of a lock ring at the time of inserting an insertion port of one fluid tube into the other fluid tube for joining by providing a peripheral surface of the insertion port of the fluid pipe with a lock rung formed of a dividing ring body to be engaged with an annular groove formed in the insertion port and a covering ring body. SOLUTION: When fitting a lock ring 1b to a spigot tube 1, the spigot tube 1 formed with an annular groove 1c in the peripheral surface of an insertion port 1a is inserted into a ball body 4 provided with a packing arranged in a packing housing groove 4a. The covering ring body 3 of the lock ring 1b is fitted on the insertion port 1a of the spigot tube 1 in the condition that a lock surface 3c and the lock member 5 are opposite to each other. Then, a dividing ring body 2 is arranged in the annular groove 2, the covering ring 3 fitted thereon is drawn to the insertion port, and an inner taper surface 3a is made to tightly contact with an outer taper surface 2a of the dividing ring body 2. At this stage, an engaging flange 3b is projected from an end of the dividing ring body 2, and folded to the center of the tube for integration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing fluid pipes from being pulled out and joined to each other by inserting an insertion port of another fluid pipe into one of the fluid pipes. The present invention relates to a device for preventing a fluid pipe from being pulled out by a lock ring provided in the fluid pipe and an engaging member engaged with the lock ring.

[0002]

2. Description of the Related Art As a device of this type, for example, a device for preventing a fluid pipe from being pulled out, which is proposed in Japanese Utility Model Laid-Open No. 5-52478, is known.

FIG. 8 shows a conventional pull-out prevention device. An annular groove A2 is formed on the outer peripheral surface of the insertion portion A1 of the fluid pipe A. The annular groove A2 has a male screw portion B1 having a tapered downward slope toward the end of the insertion portion A1 on the outer peripheral surface. The formed split lower ring B is arranged. Further, an upper ring C having a female screw portion C1 formed on the inner peripheral surface thereof, which is screwed to the male screw portion B1 of the lower ring B, is externally fitted to the lower ring B and screwed.

By screwing the upper ring C to the lower ring B and tightening it, the lower ring B is tightened into the annular groove A2 by the action of the tapered male screw portion B1 and female screw portion C1, and the upper ring C is attached to the fluid pipe. And the lower ring B are fixed.

When a pulling force acts on the fluid pipe, the upper and lower rings fixed to the fluid pipe engage with an engaging member provided at the other fluid pipe receiving portion (not shown) so that the fluid pipe can be connected. Pulling out of each other is prevented.

[0006]

In this conventional apparatus, the outer peripheral surface of the lower ring B and the inner peripheral surface of the upper ring C are formed in a tapered male screw portion B1 and a female screw portion C1, respectively. In the manufacturing process, high processing accuracy is required, and processing is troublesome, resulting in an increase in processing cost. Also, in the process of assembling the upper and lower rings, it takes time and effort to screw the upper ring into the divided lower ring, which increases the assembly cost, and increases the manufacturing cost of the lock ring provided in the insertion portion.

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems, and it is an object of the present invention to provide a fluid pipe withdrawing prevention device which simplifies the processing and assembly of a lock ring and reduces the production cost. It is in.

[0008]

In order to solve the above-mentioned problems, a pull-out prevention device according to the present invention is provided on an outer peripheral surface of an insertion portion of a fluid pipe inserted through a locking member in a convex shape. In the fluid pipe withdrawal prevention device, in which the lock ring is engaged with the locking member to prevent the withdrawal of the fluid pipe,
The lock ring comprises: a split ring body having at least one split portion externally fitted into an annular groove formed on an outer peripheral surface of the insertion portion; and a covering ring body covering the outer peripheral surface of the split ring body. The body is provided with an engagement flange that engages with an engagement concave portion formed on the distal end side of the split ring body in the insertion direction or the outer peripheral surface of the split ring body, and also has an engagement flange in the insertion direction of the split ring body. The rear end side serves as a stopper for the covering ring body.

An outer tapered surface is formed on the outer peripheral surface of the split ring body so as to increase in diameter toward the insertion end, and an inner tapered surface on the inner peripheral surface of the covering ring body is in close contact with the outer tapered surface. Preferably, a surface is formed.

[0010] It is preferable that the engaging ring is bent to engage the covering ring with the split ring.

According to the present invention, the split ring body and the covering ring body are engaged with the annular groove formed on the outer peripheral surface of the fluid tube insertion portion by the engagement flange to form the lock ring, thereby forming the split ring. Since the body and the covering ring body do not require a threaded portion, processing and assembly are not troublesome, and the production cost can be kept low.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show a first embodiment of the present invention, which is applied to a ball-type flexible tube.

A spigot pipe (fluid pipe) 1 made of ductile cast iron has a lock ring 1b protruding from the outer peripheral surface at the distal end side of the insertion portion 1a.

The lock ring 1b is externally fitted so as to cover a two-part split ring body 2 arranged in an annular groove 1c formed in the outer peripheral surface on the distal end side of the insertion portion 1a and to cover the outer peripheral surface thereof. And a covering ring body 3.

The outer peripheral surface of the split ring body 2 is formed with a tapered outer tapered surface 2a whose diameter increases toward the end of the insertion portion, and the inner peripheral surface of the covering ring body 3 is formed on the outer tapered surface 2a. An inner tapered surface 3a that comes into close contact is formed. The split ring body 2 and the covering ring body 3 are formed by casting or forging, and need not be machined.

Four engaging flanges 3b are integrally formed on the end side of the insertion opening 1a of the covering ring body 3, and an engaging surface 3c for abutting against the locking member 5 is formed on the opposite side. Have been. The minimum inner diameter of the covering ring body 3 is formed larger than the outer diameter of the spigot tube.

The spigot tube 1 is watertight and expandable and contractable via a packing 7 disposed in the packing accommodation groove 4a on a spherical body 4 having an outer peripheral surface having a locking member 5 and a packing accommodation groove 4a formed on the inner peripheral surface. Has been inserted.

One side has a flange portion 6a, and the other side has a ball body 4.
The ball body 4 is rotatably fitted into a cover body 6 provided with a receiving portion 6b for receiving the ball. A packing accommodation groove 6c and a groove 6d are formed on the inner surface of the receiving portion 6b, and a ball retainer 8 is fitted into the groove 6d. The packing 9 is arranged in the packing accommodation groove 6c, and joins the ball body 4 and the cover body 6 in a watertight manner.

Next, a procedure for attaching the split ring body 2 and the covering ring body 3 to the spigot tube 1 will be described.

First, the spigot tube 1 in which the annular groove 1b is formed on the outer peripheral surface of the insertion portion 1a is inserted into the ball body 4 in which the packing 7 is arranged in the packing accommodating groove 4a.

Next, the covering ring 3 is externally fitted to the insertion portion 1a of the spigot tube 1 in a direction in which the locking surface 3c and the locking member 5 face each other, and between the annular groove 1b and the locking member 5. Deploy.

Next, the split ring body 2 is disposed in the annular groove 1b, and the coating ring body 3 fitted outside is pulled toward the front end of the insertion portion, so that the outer tapered surface 2a of the split ring body 2 has the inner tapered surface 3a. Are brought into close contact with each other to actuate the stopper function, so that the split ring body 2 is fitted to the annular groove 1b while being pressed.

The engaging flange 3 b is projected from the end of the split ring body and bent toward the center of the pipe, so that the covering ring body 3 is engaged with the split ring body 2.

When a force acts in a direction in which the spigot tube 1 is pulled out of the ball body 4, the engaging surface 3c and the locking member 5 are engaged, and the inner ring surface 3a and the outer taper surface 2a act to split the ring. The body 2 is pressed into the annular groove 1b, and the split ring body 2 and the annular groove 1c are further engaged to prevent the spigot tube 1 and the ball body 4 from being pulled out.

FIG. 4 and FIG. 5 show a second embodiment of the split ring body 2 and the covering ring body 3. An annular groove 1b is formed on the tip end side of the insertion portion 1a of the spigot tube 1, and a split ring body 2 divided into two is disposed.

A covering ring body 3 is externally fitted so as to cover the outer peripheral surface of the split ring body 2. The outer peripheral surface of the split ring body 2 is formed with an outer tapered surface 2a in a tapered shape that increases in diameter toward the end of the insertion portion.
An inner tapered surface 3a which is in close contact with the outer tapered surface 2a is formed.

At the end side of the insertion portion of the covering ring body 3, 4
The engaging flange 3b at the location protrudes and is integrally formed, and a locking piece 3d that engages in the direction of the front end of the opening of the split ring body 2 facing the inner diameter direction is formed at the front end. On the opposite side, an engagement surface 3c that contacts the locking member is formed.

The procedure for attaching the split ring body 2 and the covering ring body 3 to the spigot tube 1 is almost the same as in the first embodiment. The difference is that the flange 3b does not need to be bent.

When the covering ring body 3 which has been fitted to the opening portion 1a is drawn to the split ring body 2 provided in the annular groove 1b and fitted to the outside, the locking piece 3d of the engaging flange 3b has an outer tapered surface. 2a, and when the covering ring body 3 is pulled further, the engaging flange 3b bends along the outer tapered surface 2a, and the engaging piece 3d
Over the split ring body 2, the split ring body 2 and the covering ring body 3 are engaged.

FIGS. 6 and 7 show a third embodiment of the split ring body 2 and the covering ring body 3. FIG.

An annular groove 1b is formed at the tip end of the insertion portion 1a of the spigot tube 1, and a split ring body 2 divided into two is disposed. The covering ring body 3 is externally fitted so as to cover the outer peripheral surface of the split ring body 2.

The outer peripheral surface of the split ring body 2 is formed with an outer tapered surface 2a in a tapered shape expanding in diameter toward the end of the insertion portion 1a, and a concave groove (engaging concave portion) 2b is formed on the distal end side in the circumferential direction. Are formed continuously.

The inner peripheral surface of the coating ring body 3 is
a is formed, and an inner tapered surface 3a that is in close contact with a.
Four engaging flanges 3b protrude and are integrally formed at the end side of the insertion portion of the covering ring body 3, and engage with the concave groove 2b of the split ring body 2 at the tip at the inner diameter direction. Locking piece 3d
Are formed. On the opposite side, an engagement surface 3c that contacts the locking member is formed.

The procedure for attaching the split ring body 2 and the covering ring body 3 to the spigot tube 1 is substantially the same as in the first embodiment. The difference is that the flange 3b does not need to be bent.

When the covering ring body 3 fitted to the opening 1a is drawn to the split ring body 2 installed in the annular groove 1b and fitted to the outside, the locking piece 3d of the engaging flange 3b is formed into an outer tapered surface. When the covering ring body 3 is brought into contact with the outer ring 2a, the engaging flange 3b is bent along the outer tapered surface 2a and moves on the outer tapered surface 2a. When it falls, the split ring body 2 and the covering ring body 3 are engaged.

The present invention is not limited to the above embodiment, but can take various forms.

In the embodiment, the outer peripheral surface of the split ring body 2 and the inner peripheral surface of the covering ring body 3 are formed as tapered surfaces, but may be parallel.

In the embodiment, the split ring body 2 is divided into two, but may be divided into three or more.

The split ring body 2 may be provided with a groove in which the engagement flange is engaged and the split ring body 2 and the covering ring body 3 are engaged with each other so that they cannot rotate relative to each other.

[0041]

According to the present invention, when the lock ring is provided on the outer peripheral surface of the insertion portion of the fluid pipe, the split ring member and the covering ring member are engaged with the annular groove formed in the insertion portion by the engagement flange. Since it is not necessary to machine members such as screws that require high machining accuracy, the machining cost can be kept low. Also, in assembling, the engaging flange of the covering ring body is engaged with the split ring body. Since they are merely combined, no labor is required, and manufacturing costs including processing costs and assembly costs can be kept low.

According to the second aspect of the present invention, the outer peripheral surface of the split ring body is formed with an outer tapered surface whose diameter increases toward the insertion end, and the inner peripheral surface of the covering ring body is provided with the outer tapered surface. Since the inner tapered surface is in close contact with the tapered surface, the locking surface engages with the engaging member when the fluid pipe is ejected and output, and the split ring body is formed into an annular groove by wedge action. , And is strongly engaged to improve the slip-out preventing force.

According to the third aspect of the present invention, since the split ring body and the covering ring body are engaged by bending the engagement flange, the engagement is more reliable.

[0044]

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a lock ring.

FIG. 3 (A) is a front view showing a lock ring attached to an insertion portion, and FIG. 3 (B) is a side view thereof.

FIG. 4 is an enlarged sectional view showing a lock ring according to a second embodiment of the present invention.

FIG. 5A is a front view showing a lock ring attached to an insertion portion, and FIG. 5B is a side view thereof.

FIG. 6 is an enlarged sectional view showing a lock ring according to a third embodiment of the present invention.

FIG. 7A is a front view showing a lock ring attached to an insertion portion, and FIG. 7B is a side view thereof.

FIG. 8 is a sectional view of a conventional lock ring.

[Explanation of symbols]

 Reference Signs List 1 spigot pipe (fluid pipe) 1a insertion opening 1b lock ring 1c annular groove 2 split ring body 2a outer tapered surface 2b concave groove (engagement concave portion) 3 coating ring body 3a inner taper surface 3b engagement flange 3c engagement surface 3d Locking piece 4 Ball 4a Packing receiving groove 5 Locking member 6 Cover 6a Flange 6b Receptacle 7 Packing 8 Ball retainer 9 Packing

Claims (3)

[Claims] A lock ring, which is provided on an outer peripheral surface of an insertion portion of a fluid pipe inserted through a locking member, is engaged with the locking member so that the fluid pipe can be withdrawn. In the device for preventing removal of a fluid pipe to be prevented, the lock ring has at least one split portion externally fitted in an annular groove formed on an outer peripheral surface of an insertion portion, and an outer periphery of the split ring body. It consists of a covering ring body that covers the surface, and the covering ring body has
Alternatively, it is provided that an engagement flange that engages with an engagement recess formed on the outer peripheral surface of the split ring body is provided, and that the rear end side in the insertion direction of the split ring body serves as a stopper of the covering ring body. Characteristic device for preventing fluid from being pulled out. 2. The outer peripheral surface of the split ring body is formed with an outer tapered surface whose diameter increases toward the insertion end, and the inner peripheral surface of the covering ring body comes into close contact with the outer tapered surface. 2. The device according to claim 1, wherein an inner tapered surface is formed. 3. The device according to claim 1, wherein the engaging collar is bent to engage the covering ring with the split ring.