JPH10311476A - Joint for soft pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate hardly a mis-installing in a soft pipe joint, to generate no trouble such as the water leaking and the slip off of a pipe owing to the insertion shortage of a pipe end to a joint main body, and the like, and to generate no concurrent rotation of a chuck ring and a soft pipe in the fastening time. SOLUTION: A joint main body 1 is composed by making one side of a wrench collar 1a provided about the center the installing part to an existing pipe side, and projecting an inner tube 1c and an outer tube 1d having a clearance to permit the insertion of the pipe end of a soft pipe in the axial direction of the other side surface. While a slip off preventive groove 1f is formed on the outer periphery at the latter half part of the above inner tube 1c of the joint main body 1, and a male screw 1g allowable to fit with a box nut 2 is formed on the outer peripheral surface of the outer tube 1d, a recessed groove 2b is formed at the inner bottom of the box nut 2, numerous tooth grooves 3d are formed at a separate inner surface inside the recessed groove 2b, the surface is made in a top side thinning tapered surface 3a, and the base end projection collar 3b of a chuck ring 3 allowable to expand and contract in the axial direction is intruded there, so as to integrate the joint main body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal fitting mainly for connecting a soft pipe such as a polyethylene pipe, and more particularly to a metal fitting for fitting a chuck ring to a cap nut for fastening. It is assumed that.

[0002]

2. Description of the Related Art As a conventional soft fitting of this kind, as shown in FIG. 3, a front end of a soft pipe (b) inserted into a hollow joint body (a) is provided at a front end thereof. The core or tapered core (c) for preventing the contraction of the pipe end is inserted and the chuck ring (d) previously inserted into the soft pipe (b) side is fastened by the cap nut (e). It is widely known that the tube end portion of the soft tube is sandwiched between the core (c) and the chuck ring (d) by strongly tightening the tube. Incidentally, (f) in the figure shows a wrench flange installed around the center of the joint body.

On the other hand, in a soft pipe joint, the above-mentioned joint body (a) has a two-member structure, and the side on which the cap nut (e) is screwed is a turnable structure, and an O-ring and a rotating ring are interposed between the two members. There is also known a pipe joint which prevents the soft pipes from rotating together when the cap nut is tightened by connecting them together.

[0004]

The above-mentioned conventional general soft pipe joints include a core (c), a chuck ring (d) or, if necessary, a packing or the like inserted into the tip side of the chuck ring (d). Because the necessary members were configured separately from the joint body (a) and the cap nut (e), not only were these parts easily lost or misplaced at the site, but also the Accidents such as water leakage and detachment of the pipe often occurred due to insufficient insertion, etc. In addition, in the case of a conventional joint body, the rotational torque of the cap nut increased to 60 to 100 Nm. At the time of tightening, the chuck ring and the soft tube rotate together,
There was also a problem that the work was extremely difficult. In addition, the above-described two-membered joint body has a problem that the structure is complicated and the trouble and the cause of wet water are assisted.

[0005]

SUMMARY OF THE INVENTION The present invention comprises a hollow joint body and a cap nut for tightening a pipe for the purpose of solving many of the problems commonly found in the above-mentioned conventional soft pipe joints. In a soft pipe joint, a wrench flange is circulated around a substantially central portion of a joint body having one side attached to an existing pipe side, and a gap into which a pipe end of a connection pipe can be inserted in an axial direction of one side surface of the flange. The outer and inner cylinders are concentrically protruded, and a stopper is provided on the outer peripheral surface of the rear half of the inner cylinder, and a male screw part that can be screwed to the cap nut is installed on the outer peripheral surface of the outer cylinder. On the other hand, a concave groove is provided in the inner part of the cap nut provided with a female screw corresponding to the male screw of the outer cylinder of the joint body, and in the concave groove, a plurality of tooth grooves are separately provided on the inner surface. Is tapered, and a protruding flange is provided around the base end, and a split groove is provided in the axial direction for elastic expansion and contraction. Using means of integrally constructing the above 突鍔 of the chuck ring by invagination.

Further, a means for opening a window at the base end of the outer cylinder of the joint body is also employed.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a flexible pipe joint according to the present invention; FIG. One side of a wrench flange 1a formed around the center of the rust metal is used as a connection part 1b on the existing pipe side, and an inner cylinder 1c and an outer cylinder 1d extending in the axial direction on the other side surface of the wrench flange 1a. Are formed concentrically, a gap 1e is provided between the inner cylinder 1c and the outer cylinder 1d, into which the tube end of the soft tube 4 can be inserted, and one or more stoppers are provided on the outer peripheral surface of the rear half of the inner tube 1c. A groove 1f is provided, and an external thread 1g for screwing with the cap nut 2 is cut out on the outer surface of the outer cylinder 1d. Further, the inner surface of the opening of the outer cylinder has a constant downward slope from the mouth end. The tapered surface 1h is formed.

In the figure, reference numeral 1i denotes at least one window hole penetrating through the base of the outer cylinder 1d.

Reference numeral 2 denotes a tightening member made of a metal material of the same quality as the joint body 1 and having a female screw portion 2a screwed with the male screw 1g of the outer cylinder 1d, the tip of which has a wrench flange 1a as a contact surface. With a groove 2b on the inner surface.
Is arranged.

Reference numeral 3 denotes a chuck ring made of a hard synthetic resin or the like having a certain elasticity. The surface of the chuck ring 3 is a tapered surface 3a which matches the tapered surface 1h of the inner surface of the outer cylinder of the joint main body 1. On the surface, a protruding flange 3b which can be indented into a concave groove 2b provided in the inner back surface of the cap nut 2 is provided, while a slightly protruding ridge 3c is provided on the back surface of the protruding flange 3b.
Are integrally arranged.

On the other hand, on the inner surface of the chuck ring 3,
A tooth groove 3d having a saw-tooth cross section is provided around substantially the entire length, and a split groove 3e having a fixed width is provided in one place of the chuck ring 3 so that the entire chuck ring can be elastically expanded and contracted. It is what was constituted.

The soft pipe joint of the present invention having the above-described structure is integrated with the male screw portion 1g of the outer cylinder 1d of the joint body 1 by previously indenting the flange 3b of the chuck ring 3 into the groove 2b. The female threaded portion 2a of the cap nut 2 is lightly mounted, one side of the joint brought into the field in this state is connected to the existing pipe side, and then the soft pipe 4 cut accurately from the rear end opening 2c of the cap nut 2 In this case, the tube end of the soft tube is confirmed by the window hole 1i or the like so as to stop at about 3 mm before the wrench flange surface of the joint body serving as the contact surface.

At this position, when a pipe wrench (not shown) is hung on both the wrench flange 1a and the cap nut 2 to rotate the cap nut 2 in the forward direction, the chuck ring 3 that moves along with the cap nut 2 is moved. Because of the relationship with the tapered surface 1h of the inner surface of the outer cylinder, the diameter of the split groove 3e is reduced and the diameter thereof is reduced, so that the pipe end portion is reduced in accordance with the amount of the reduction and pressed against the surface of the inner cylinder 1c. The tooth grooves 3d on the inner surface of the chuck ring 3 bite into the tube end surface, and the retaining grooves 1f of the inner cylinder 1c bite into the tube end inner surface, thereby reliably preventing the soft tube 4 from loosening or falling out.

When the soft nut 4 is tightened by the cap nut 2, the chuck ring 3 moves slightly forward with the screwing of the cap nut, but the soft pipe 4 which the tooth groove 3d of the chuck ring bites also moves forward. Go to In consideration of this movement amount, a gap of about 3 mm is left between the pipe end and the wrench 1a surface of the joint body, which is the contact surface, when the soft tube is inserted, and the gap is absorbed by the gap. The pipe end is easily attached to the joint body. The window hole 1i plays an important role in confirming the pipe end position.

Further, the convex 3c is provided on the back surface of the chuck ring 3 with which the inner surface of the cap nut 2 comes into contact with the tightening of the cap nut 2 with respect to the joint main body 1, so that the inner surface of the cap nut 2 is in contact with the inner surface. The frictional resistance is reduced and the rotation of the cap nut can be prevented from being transmitted to the chuck ring. As a result, even if the rotation torque of the cap nut during tightening increases, the chuck ring 3 and the soft tube 4 rotate together. The connection work can be performed safely and easily.

[0016]

As described above, according to the pipe joint of the present invention, as described above, the joint body and the cap nut preliminarily provided with the chuck ring are lightly screwed together. By inserting the pipe end of the soft tube from the rear end opening of the cap nut and rotating the cap nut, the connection of the pipe is easy, quick, safe and reliable. .

In the above connection work, since members are not assembled on site as in the prior art, not only connection failure due to erroneous mounting, loss or damage of parts, but also the insertion position of the pipe end can be easily confirmed. The presence of such a window hole has a great effect of shortening the working time, for example, there is no occurrence of accidents such as detachment of the pipe or leakage of water.

In addition, in the joint structure of the present invention, not only can the co-rotation of the cap nut and the chuck ring be prevented by reducing the contact resistance between the inner wall of the cap nut and the back surface of the chuck ring, but also the rotational torque of the cap nut is 40 to 40. 50 Nm,
An extremely remarkable effect such as a reduction of 30 to 50% as compared with a joint having a conventional structure can be expected.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view showing a pipe joint of the present invention in a partially exploded manner.

FIG. 2 is a front view showing a state in which a soft tube is connected, with a part cut away.

FIG. 3 is a front view showing a cross section of an upper half in a connection state of a conventional pipe joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joint main body 1a Wrench flange 1b Connection tube 1c Inner cylinder 1d Outer cylinder 1e Distance between inner and outer cylinders 1f Retaining groove 1g Male screw part 1h Tapered surface 1i Window hole 2 Cap nut 2a Female screw part 2b Concave groove 3 Chuck ring 3a Tapered surface 3b protruding flange 3c convex ridge 3d tooth space 3e split groove 4 soft tube

Claims (2)

[Claims] 1. An inner cylinder and an outer cylinder having a gap at one side of a wrench flange provided at a substantially central portion as a mounting portion to an existing pipe side and capable of inserting a pipe end of a soft pipe in an axial direction on the other side face. The joint body formed concentrically is provided with a retaining groove on the outer periphery at the rear half of the inner cylinder, and a male screw part which can be fitted with a cap nut on the outer peripheral surface of the outer cylinder. A concave groove is formed in the inner part of the nut, and a number of tooth grooves are separately formed in the groove inside the groove, and the proximal end of a chuck ring that can expand and contract in the axial direction as a tapered tapered surface. A joint for a soft pipe, wherein a flange is invaginated and integrally formed. 2. The joint for a flexible pipe according to claim 1, wherein a window hole is opened at a base end of the outer cylinder of the joint body.