JPH0796913B2 - Pipe fitting retaining mechanism - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a retaining mechanism for a pipe joint used to connect pipes through which various fluids such as liquid and gas are circulated.

[Conventional technology]

Conventionally, as shown in FIGS. 7 and 8, in the joint body (1), when a pulling force is applied to the pipe (6) connected to the insert (4) in the pulling direction, the pipe (6) A pipe joint having a collet (5) that is tightened so as not to come off is used.

However, when the collet (5) does not move reliably in the pulling direction, the tightening force of the collet (5) does not act and the connected pipe (6) may fall out.

[Problems to be Solved by the Invention]

Therefore, in the present invention, in a pipe joint having a collet for tightening the pipe so as not to come off, when the pipe is pulled in the pulling direction, the collet also surely moves slightly in the pulling direction so as not to come off the pipe. The present invention seeks to provide a retaining mechanism for a pipe joint that can be tightened and reliably keep the pipe connected.

[Means for Solving the Problems]

Therefore, in the present invention, the retaining mechanism of the pipe joint is applied to a pipe joint having an insert for fitting the pipe to the outer surface in the joint body, and a collet for pipe tightening which is embedded with an appropriate interval between the insert. In the structure, a locking member for pressing the collet in the direction of pulling out the pipe is provided on the outside of the insert, and the locking member is configured as a member separate from the insert and the collet, and engages with the outer periphery of the insert. And

In addition, the retaining mechanism of the pipe joint, in the pipe joint having an insert for fitting the pipe to the outer surface in the joint body, and a collet for pipe fastening that is built in with an appropriate gap between the insert and A locking member that presses the collet in the direction of pulling out the tube is provided on the outside of the insert, and the locking member is formed integrally with the collet at the inner end of the collet and engages with the outer periphery of the insert.

[Action]

In the pipe joint using the above means, the locking member that presses the collet in the direction of pipe removal is provided on the outside of the insert, so if the pipe moves a little in the direction of removal, the insert also moves in the direction of removal. The movement of the insert is transmitted to the collet via a locking member that engages with the outer circumference. Then, the collet moves in the same direction as the pipe moves in the pulling direction to apply a tightening force to the pipe, and the collet surely plays a role of preventing the pipe from coming off.

Further, according to the invention of claim 1, as compared with the case where the locking member is projectingly formed on the insert itself or the collet itself, the locking member which is a separate member is press-pressed from a plate material. Since it can also be manufactured by such as, it becomes very easy to manufacture and assemble the pipe joint.

According to the second aspect of the present invention, when the pipe is inserted into the pipe joint to be connected, the locking member integrally formed with the inner end of the collet is inserted into the locking member and the outer periphery thereof. At the same time, it can be pushed toward the insertion direction at the end of the pipe, and the collet and insert together with the pipe can be reliably moved to a position deep in the insertion direction of the pipe. A good connection state can be obtained.

〔Example〕

The configuration of the present invention will be described below with reference to the drawings shown as embodiments.

In this pipe joint, a joint body (1) is configured by connecting a nipple (2) and a socket (3), an insert (4) is fitted to an inner front portion of the nipple (2), and an insert (4) A collet (5) is built in with an appropriate space outside.

The insert (4) is inserted into the end of the pipe (6) to connect the pipe (6), and the rear end of the insert (4) abuts on the step (7) of the nipple (2) so that the insert (4) goes into a certain depth. It has no structure.

With the pipe (6) fitted with the insert (4),
Furthermore, a collet (5) is arranged outside the pipe (6).

As shown in FIG. 9, the collet (5) has kerfs (8) formed in the longitudinal direction from the front and rear, and has elasticity inward and outward. Therefore, when the pipe (6) is connected and a force is applied to the pipe (6) in the removal direction, both the insert (4) and the collet (5) move in the removal direction to some extent. At this time, since the inner surface of the socket (3) has a taper shape with a small diameter in the front direction, the collet (5)
Deforms to a smaller diameter and tightens the tube (6), thus the tube (6)
It has a mechanism to prevent it from coming off.

However, when the contact state between the collet (5) and the pipe (6) is loose, the collet (5) does not move in the pull-out direction, and therefore the tightening force of the collet (5) may not work.

Therefore, a locking member (9) for pressing the collet (5) in the direction of pulling out the pipe (6) is provided outside the substantially central portion of the insert (4).
Was set up.

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 pull-out direction, it moves together with the insert (4). . Further, this locking member (9) has a structure that abuts against the inner end of the collet (5), and therefore, when the pipe (6) moves in the pulling-out direction, together with the pipe (6), the insert (4), the locking The member (9) and the collet (5) all start moving in the same direction.

When moved a little, the collet (5) is affected by the tapered shape of the socket (3) and starts to deform to a small diameter. When the collet (5) has a small diameter, the pipe (6) is clamped by the collet (5) and does not move in the removal direction for a certain length or more, and is prevented from coming off.

1 to 4 show an embodiment in which the locking member (9) is formed separately from the collet (5), and FIGS. 3 and 4 show the outside of the locking member (9). The diameter is formed larger than the outer diameter of the collet (5), and the structure in which the locking member (9) and the inner surface of the socket (3) are joined together does not move in the pulling direction more than necessary.

5 and 6 show that the locking member (9) has the collet (5).
In this case, an inner end portion of the collet (5) is formed in a flange shape inward to form a locking member (9), and the locking member (9) is formed. Is locked to the insert (4).

Although not shown, the locking member (9) and the insert (4) may be integrally formed. In this case, the locking member (9) is extended on the outside of the insert (4) to form a protrusion.

〔The invention's effect〕

The present invention has the structure as described above, and therefore, when a force in the pulling direction acts on the pipe (6), the pipe (6) is pulled out from the insert (4) via the locking member (9). The movement in the direction also surely moves the collet (5), and thus the retaining mechanism of the pipe joint does not act on the collet (5) but reliably acts on the retaining function.

Further, according to the invention described in claim 1, manufacturing and assembling of the pipe joint becomes very easy, and according to the invention described in claim 2, a reliable connection state of the pipe (6) to the pipe joint can be obtained.

[Brief description of drawings]

FIG. 1 is a longitudinal cross-sectional view of a main part of a pipe joint having a pipe joint retaining mechanism according to the present invention. FIG. 2 is a longitudinal sectional view of an essential part showing a working state of the collet shown in FIG. FIG. 3 is a longitudinal sectional view of a main part of a pipe joint showing an embodiment in which a locking member has a large outer diameter. FIG. 4 is a longitudinal sectional view of an essential part showing a working state of the collet shown in FIG. FIG. 5 is a longitudinal sectional view of a main part of a pipe joint in which a locking member is formed integrally with a collet. FIG. 6 is a longitudinal sectional view of an essential part showing an operating state of the collet shown in FIG. FIG. 7 and FIG. 8 show a conventional example, and FIG. 7 is a longitudinal sectional view of a main part of a conventional pipe joint.
FIG. 8 is a longitudinal sectional view of a main part showing a connected state of a conventional pipe. 9th
The figure is a perspective view of the collet. (1) …… Joint body, (4) …… Insert, (5)…
… Collet, (6) …… Tube, (9) …… Locking member

Claims (2)

[Claims] Claim: What is claimed is: 1. In a joint body formed by combining a nipple and a socket, an insert for fitting a pipe to an outer surface is slidably fitted to an end of the nipple, and an appropriate gap is provided between the insert and the insert. In a pipe joint having a collet for pipe tightening built in, a locking member for pressing the collet in the direction of pulling out the pipe is provided on the outside of the insert, and the locking member is separate from the insert and the collet. A retaining mechanism for a pipe joint, which is configured as a member and engages with an outer periphery of an insert. 2. An insert for fitting a pipe to an outer surface is slidably fitted to an end of the nipple in a joint body formed by connecting a nipple and a socket, and an appropriate gap is provided between the insert and the insert. In a pipe joint having a collet for pipe tightening built in, a locking member that presses the collet in the direction of pipe withdrawal is provided on the outside of the insert, and the locking member is a collet at the inner end of the collet. Configured as one,
A retaining mechanism for a pipe joint, characterized by engaging with the outer periphery of an insert.