JPH0446291A - Locking mechanism for pipe joint - Google Patents

Abstract

PURPOSE:To obtain a pipe joint locking mechanism which can keep the certain connection of a pipe by providing a locking member to press a collet in the direction of slipping out of the pipe on the outside of a nearly central part of an insert. CONSTITUTION:A locking member 9 to press a collet 5 in the direction of slipping out of a pipe 6 is provided on the outside of a nearly central part of an insert 4, and locked on the outside of the insert 4 to form a protrusive shape so as to move as the insert 4 moves in the direction of its sipping out. In addition to that, the locking member 9 is constructed to abut on the inner end of the collet 5, and, when the pipe 6 moves in the direction of its slipping out, the above elements begin to wholly move in the same direction as the pipe 6. When a little movement occurs, the collet 5 is influenced by the tapered shape of a socket 3 to become smaller in its diameter, and the pipe 6 is thereby tightly fastened not to move beyond a fixed length in the direction of its slipping out and to be prevented from slipping out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a retaining mechanism for a pipe joint used to connect pipes through which various fluids such as liquids and gases flow.

[Conventional technology]

Conventionally, as shown in Figs. 7 and 8, the joint body (1
), a pipe joint is used that has a collet (5) that tightens the pipe (6) to prevent it from coming off when a pulling force is applied to the pipe (6) connected to the insert (4) in the direction of withdrawal. There is.

However, if the collet (5) does not move reliably in the withdrawal direction, the tightening force of the collet (5) is not applied, and the connected pipe (6) may come out.

[Problem to be solved by the invention]

Therefore, in this invention, in a pipe joint that has a collet that tightens the pipe so that it does not come out, when the pipe is pulled in the direction of withdrawal, the collet also moves slightly in the direction of withdrawal to prevent the pipe from coming out. The present invention is intended to provide a mechanism for preventing the pipe joint from coming off by tightening the pipe to ensure that the pipe continues to be connected.

[Means to solve the problem]

In this invention, the slip-out prevention mechanism of a pipe joint is made of a pipe joint that has an insert that fits the pipe on the outside surface of the joint body, and a collet for tightening the pipe that is built in with an appropriate interval between the insert and the insert. The structure is such that a locking member is provided on the outside of the insert to press the collet in the direction in which the tube comes out.

Further, the locking member described above may be configured separately from the collet, or may be configured integrally with the collet, or the locking member and the insert may be configured integrally.

[For production]

In a pipe joint using the above method, a locking member that presses the collet in the direction of pipe removal is provided on the outside of the approximate center of the insert, so when the pipe moves slightly in the direction of removal, the The insert also moves in the removal direction, and this movement of the insert is transmitted to the collet via the locking member. Therefore, the collet moves in the same direction as the tube moves in the direction of withdrawal and applies a tightening force to the tube, and the collet reliably serves to prevent the tube from coming off.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be explained below with reference to the drawings showing examples.

This pipe joint is constructed by combining a joint body (1) with a nipple (2) and a socket (3), an insert (4) fitted into the front inside of the nipple (2), and an insert (
A collet (5) is built in at an appropriate interval on the outside of the collet (5).

The insert (4) is inserted into the end of the tube (6) and
6), and has a structure in which the rear end abuts against the step (7) of the nipple (2) and does not go deeper than a certain level.

In the state where the tube (6) is fitted with the insert (4), a collet (5) is further arranged on the outside of the tube (6).

As shown in FIG. 9, the collet (5) has grooves (8) formed in the longitudinal direction from the front and back, and has elasticity in the inner and outer directions. Therefore, in the state where the pipe (6) is connected, the pipe (
If force is applied to the insert (6) in the direction of removal, the insert (4)
), the collet (5) also moves somewhat in the pulling direction. At this time, since the inner surface of the socket (3) has a tapered shape where the diameter becomes smaller in the front direction, the collet (5) deforms to a smaller diameter and tightens the tube (6), thereby preventing the tube (6) from coming off. The system is designed to achieve this goal.

However, if the contact between the collet (5) and the tube (6) is loose, the collet (5) may not move in the removal direction, and therefore the tightening force of the collet (5) may not work.

Therefore, a locking member (9) that presses the collet (5) in the direction in which the tube (6) comes out is installed on the outside of the approximately central portion of the insert (4).
has been established.

The locking member (9) is locked to the outside of the insert (4) to obtain a protruding shape, and when the insert (4) moves in the removal direction, it moves together with the insert (4). . Furthermore, this locking member (9) has a collet (
The structure is such that it abuts the inner end of the tube (6).
) moves in the withdrawal direction, the insert (4), locking member (9) and collet (5) all start moving in the same direction together with the tube (6).

After some movement, the collet (5) begins to deform to a smaller diameter under the influence of the tapered shape of the socket (3). When the diameter of the collet (5) is reduced, the tube (6) is tightened by the collet (5) and does not move beyond a certain length in the withdrawal direction, thereby preventing the tube from coming off.

Figures 1 to 4 show an embodiment in which the locking member (9) is configured separately from the collet (5), and Figures 3 and 4 show the outside of the locking member (9). The diameter is made larger than the outer diameter of the collet (5), and the inner surface of the locking member (9) and the socket (3) are joined to prevent movement in the withdrawal direction more than necessary.

5 and 6, the locking member (9) is attached to the collet (5).
In this case, the inner end of the collet (5) is formed inwardly into a brim shape to serve as the locking member (9), and the locking member (9) is formed integrally with the locking member (9). ) is locked to the insert (4).

Although not shown, the locking member (9) and the insert (
4) can also be implemented by integrally configuring. In this case, the locking member (9) is extended and projected from the outside of the insert (4).

〔Effect of the invention〕

This invention has the above-mentioned configuration, and therefore, when a force in the direction of withdrawal acts on the tube (6), the tube (6) is prevented from coming out from the insert (4) via the locking member (9). The movement in this direction also reliably moves the collet (5), so that the falling-off prevention mechanism of this pipe joint will not cause the collet (5) to fail, and will reliably prevent the collet (5) from coming off.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a main part of a pipe joint having a pipe joint slip-off prevention mechanism according to the present invention. FIG. 2 is a longitudinal cross-sectional view of a main part showing the working state of the collet shown in FIG. 1. FIG. 3 is a vertical cross-sectional view of a main part of a pipe joint showing an embodiment in which the outer diameter of the locking member is increased. FIG. 4 is a longitudinal cross-sectional view of a main part showing the operating state of the collet shown in FIG. 3. FIG. 5 is a longitudinal sectional view of the end portion of a pipe joint in which the locking member is integrally formed with the collet. FIG. 6 is a vertical cross-sectional view of a main part showing the operating state of the collet shown in FIG. 5. 7 and 8 show a conventional example, and FIG. 7 is a vertical sectional view of the main part of a conventional pipe joint. FIG. 8 is a vertical cross-sectional view of a main part showing a conventional pipe connection state. FIG. 9 is a perspective view of the collet.

Claims (1)

[Scope of Claims] 1. An insert for fitting a pipe onto the outer surface of the joint body;
A pipe joint having a built-in collet for tightening a pipe with an appropriate distance between it and the insert is characterized in that a locking member is provided on the outside of the insert to press the collet in the direction in which the pipe comes out. A mechanism to prevent pipe fittings from falling out. 2. The pipe fitting retaining mechanism according to claim 1, wherein the locking member is constructed separately from the collet. 3. The pipe fitting retaining mechanism according to claim 1, wherein the locking member is constructed integrally with the collet. 4. The pipe joint retaining mechanism according to claim 1, wherein the locking member is integrally formed with the insert.