JPH1194155A - Incore for flexible pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lock an incore to the bore of a flexible joint pipe without force by providing a flange at the insert terminus of an incore body insert-fitted into the bore of the joint insert end of the joint pipe, and providing a protruding part on the outer surface of a body inner fitting part. SOLUTION: An incore body 1 is formed to have an outer diameter corresponding to the inner diameter of a flexible joint pipe A, and an outward warped flange 3 for covering the outer diameter of an insert tip part (a) of the joint pipe A into a joint J is formed at the insert terminus of the incore body 1, and a protruding part 4 formed of a plurality of protrusions 41 is formed at the outer surface of the incore body 1, in a position receded by the specified length from the flange 3 of the incore body 1. The flange 3 is formed in a tip part curved surface by reversing an edge 31 of the body 1 to the outside, and the edge 31 is jointed to the outer surface of the joint pipe A. Since the incore body 1 is thus inserted in the bore of the flexible joint pipe A, the end part (a) of the flexible joint pipe A is reinforced, and mounting of the pipe joint J is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a water pipe, an air conditioning pipe, etc., which are used by connecting a flexible pipe such as a polyethylene pipe.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an incore for a flexible pipe joint which is internally fitted to a flexible pipe in order to reinforce an end of the flexible pipe inserted into the pipe joint or to correct flatness.

[0002]

2. Description of the Related Art Conventionally, an incore for a flexible pipe joint has a flange provided at one end to indicate an insertion end, and an inner fitting portion to the flexible pipe is formed as a simple straight pipe, and an inner fitting portion is formed as a tapered pipe. Have been used.

[0003] When the inner fitting portion is formed as a straight tube,
It is used by simply inserting it into the inner diameter of the flexible pipe by hand, and the one with the inner fitting part formed into a tapered pipe is used by being inserted into the inner diameter of the flexible pipe with a plastic hammer.

[0004]

However, since there is a tolerance in the inner diameter of the flexible tube into which the incore is inserted, it is difficult to insert a flexible tube having a straight fitting portion within the tolerance when the inner diameter is small. In addition, when the inner diameter is large within the tolerance, it is easy to insert instead of insert easily, and there is a problem that the incore falls when trying to insert the joint pipe having the incore inserted into the joint.

[0005] In addition, a tapered inner fitting portion has a problem that the operation cannot be performed unless a tool is used for the in-core insertion operation.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a flange provided at an insertion end of a main body inserted into the inside diameter of a joint insertion end of a joint pipe, and a flange provided at the end. By providing a protrusion on the outer surface of the main body inside fitting portion by retreating a predetermined length, it is impossible to apply an incore to the inner diameter of the flexible joint pipe by the flange at the insertion end and the protrusion set at a position retracted from the flange by a predetermined length. Without any locking.

Further, by forming the flange provided at the insertion end of the main body as a valgus flange for covering the outer diameter of the joint insertion tip of the joint pipe, the valgus flange having a tapered chamfered tip can be used as the joint. Since the outer diameter of the insertion end is covered, the joint pipe having the inner core inserted into the flexible joint pipe can be smoothly fitted into the joint insertion portion.

Furthermore, by forming the projections provided on the outer surface of the inner fitting portion of the main body into a plurality of point projections extending over the outer diameter of the inner fitting portion, the locking pressure of the incore on the inner diameter of the flexible joint pipe can be reduced. The joint pipe can be reliably locked by a point-shaped locking pressure without applying a split pressure to the inner diameter of the joint pipe.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes an in-core body having an outer diameter corresponding to the inner diameter of the flexible joint pipe A, and the insertion distal end portion 2 is reduced in diameter so that it can be easily inserted into the joint pipe A.

At the insertion end of the main body 1, the joint J of the joint pipe A is inserted.
A valgus flange 3 is set to cover the outer diameter of the distal end portion a of the insertion, and a projection 4 is formed at a position retracted from the flange 3 by a predetermined length.

The valgus flange 3 is configured such that an end edge of the main body 1 is turned outward and a front end portion is formed into a curved surface, and the end edge 31 is joined to an outer diameter of the joint pipe A to cover the front end portion a. Since it is configured so as to be integral with the outer diameter of the joint pipe A, a smooth curved surface is formed by the cover of the flange 3 even if processing such as chamfering is not added to the distal end a of the joint pipe A.
Can be inserted into

It is needless to say that the flange 3 may not be formed in such a valgus configuration, but may be formed as a normal flange whose lower surface is joined to the outer diameter of the distal end portion a, and the upper surface may be chamfered. However, by using a valgus configuration, the processing efficiency of this portion can be dramatically increased.

The projection 4 is constituted by a plurality of point projections 41, 41,. In addition, it is a matter of course that the projection 4 may be configured as an annular projection or the like that goes around the outer surface of the main body 1.

[0014] By inserting the in-core for a flexible pipe joint thus configured into the inner diameter of the flexible pipe A, the end a of the flexible pipe A inserted into the pipe joint J is reinforced and the flatness is corrected. The flexible pipe A, which is flexible and difficult to mount on the pipe joint J, can be mounted very easily and reliably.

In addition, even if an axial tensile load or bending load is applied to the flexible joint pipe A after construction, deformation of the flexible joint pipe A is prevented in the range of the in-core insertion portion, and adhesion to the O-ring is maintained. You can do it.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and is a side view of the entire longitudinal section in a state where a flexible joint pipe fitted with an incore is inserted into a pipe joint.

FIG. 2 is an enlarged side view of the in-core similarly showing the embodiment.

FIG. 3 is an enlarged cross-sectional view of the in-core shown in FIG. 2 taken along line XX.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 In-core main body 2 In-core insertion tip 3 Flange 31 Edge of flange 4 Projection 41 Point projection A Flexible joint pipe a Flexible joint pipe end J Pipe joint

Claims (3)

[Claims] A flange is provided at an insertion end of a main body to be inserted into an inner diameter of a joint insertion end of a joint pipe, and a projection is provided on an outer surface of a main body inner fitting portion by retreating from the flange by a predetermined length. Incore for flexible pipe joints characterized by the following: 2. The incore for a flexible pipe joint according to claim 1, wherein the flange provided at the insertion end of the main body is a valgus flange for covering the outer diameter of the joint insertion tip of the joint pipe. 3. The in-core for a flexible pipe joint according to claim 1, wherein the projections provided on the outer surface of the inner fitting portion of the main body are formed as a plurality of point projections extending over the outer diameter of the inner fitting portion.