JPH074578A - Synthetic resin made pipe joint with insert and manufacture thereof - Google Patents

Abstract

PURPOSE:To prevent water from seeping in a synthetic resin made pipe joint having an annular threaded fitting embedded in the inner surface by providing a thin curved projection on the tip of the threaded fitting to interpose an O-ring in a pressed state between the projection and the inner surface of the pipe joint. CONSTITUTION:In a pipe joint A having an annular threaded fitting 1 embedded in the inner surface of a synthetic resin made pipe joint 2, the annular threaded fitting 1 is provided on the tip with a thin thickness projection extending axially. A soft material made O-ring 3 is located on the tip of the border between the pipe joint 2 and annular threaded fitting 1 so that the O-ring 3 is interposed to be pinched between the projection 12 and the inner surface of the pipe joint 2 by bending outward the thin thickness projection 12. Thus, tap water is surely prevented from seeping through the border between the pipe joint 2 and annular threaded fitting 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin pipe joint with an insert and a method for manufacturing the pipe joint. More specifically, the present invention relates to a faucet socket in which an annular screw fitting is embedded in the inner surface of a synthetic resin pipe joint, and a method for manufacturing the faucet socket.

[0002]

2. Description of the Related Art Conventionally, when a metal faucet is connected to a synthetic resin pipe, an annular screw metal fitting is provided on the inner surface of the synthetic resin pipe joint as described in Japanese Utility Model Publication No. 58-144180. Embedded synthetic resin pipe fittings with inserts are used. However, a synthetic resin pipe fitting with an insert in which an annular screw fitting is embedded in the inner surface of the synthetic resin pipe joint has a problem that tap water seeps out from the boundary between the synthetic resin pipe joint and the annular screw fitting. Therefore, conventionally, as described in the above publication, the boundary surface between the synthetic resin pipe joint and the annular screw fitting is lengthened, or a seal material having rubber elasticity is provided at this boundary portion to seep out tap water. Was trying to prevent.

[0003]

However, as a result of research conducted by the inventor, even if the boundary surface between the synthetic resin pipe joint and the annular screw fitting is lengthened or a seal material having rubber elasticity is provided at this boundary portion. , It was found that the seepage of tap water could not be completely prevented. Therefore, an object of the present invention is to provide a synthetic resin pipe joint with an insert that does not exude tap water and a method for manufacturing the same.

[0004]

The present invention has been made to solve the above problems and achieve the above objects.
The synthetic resin pipe fitting with an insert of the present invention is a synthetic resin pipe fitting with an insert, in which an annular screw fitting is embedded in the inner surface of the synthetic resin pipe fitting, and a thin curved protrusion at the tip of the annular screw fitting. Is provided, and an O-ring made of a soft material is watertightly sandwiched between a curved projection and a boundary tip portion between the synthetic resin pipe joint and the annular screw fitting.

Further, according to the method of manufacturing a synthetic resin pipe joint with an insert of the present invention, an annular screw fitting having a thin projection at the tip is attached in a mold of an injection molding machine, and the annular screw fitting is attached. By injecting molten synthetic resin to the outer peripheral surface of, the annular screw fitting is embedded in the inner surface of the synthetic resin pipe joint,
After manufacturing the synthetic resin pipe fitting body with insert in which a gap is formed between the projection of the annular screw metal fitting and the tip of the synthetic resin pipe fitting, the projection of the annular screw metal fitting and the tip of the synthetic resin pipe fitting An O-ring made of a soft material is inserted into a gap formed between the O-ring and the joint, and the O-ring is pinched by curving the protrusion provided at the tip of the annular screw fitting to form a synthetic resin pipe joint. An O-ring made of a soft material is watertightly sandwiched between the tip of the boundary with the annular screw fitting and the curved projection.

The O-ring used in the present invention is made of a soft material. The soft material may be any material as long as it is a soft body having excellent water resistance, but rubber such as synthetic rubber or natural rubber, and soft synthetic resin such as soft vinyl chloride resin or ethylene resin are preferable.

[0007]

In the past, tap water has exuded from the boundary between the synthetic resin pipe joint and the annular screw fitting. In the present invention, however, soft water is provided at the tip of the boundary between the synthetic resin pipe joint and the annular screw fitting. Since the O-ring made of the material is watertightly sandwiched, tap water does not seep out. In addition, this structure that does not exude is a structure in which the O-ring made of a soft material is clamped by the curved projection provided at the tip of the annular screw fitting, so that the structure is simple and convenient.

In the method of manufacturing a synthetic resin pipe joint with an insert of the present invention, first, an annular screw fitting having a thin projection at the tip is inserted into a mold in the same manner as in the prior art, and injection molding is performed. Machine manufactures synthetic resin pipe fittings with inserts. At that time, a gap is formed between the projection of the annular screw fitting and the tip of the synthetic resin pipe joint. After that, the O-ring made of a soft material is inserted into the gap between the projection of the annular screw fitting and the tip of the synthetic resin pipe joint, and the projection of the annular screw fitting is curved to clamp the O-ring. Very easy to manufacture.

[0009]

EXAMPLES Next, examples of the present invention will be described. 1 to 4
1 shows an embodiment of the method for producing a synthetic resin pipe joint with an insert of the present invention and the synthetic resin pipe joint with an insert produced by this method. FIG. 1 is an explanatory view showing a cross section of an annular screw fitting. 2 is an explanatory view showing a cross section of a synthetic resin pipe joint body with an insert provided by injecting a synthetic resin on the outer peripheral surface of the annular screw fitting shown in FIG. 1, and FIG. 3 is a synthetic resin pipe joint with an insert shown in FIG. FIG. 4 is an explanatory view showing a state where the protrusion of the annular screw fitting of the main body is curved, and FIG. 4 is an explanatory view showing a cross section of the synthetic resin pipe joint with insert. FIG. 5 shows another embodiment of the present invention and is an explanatory view showing a cross section of a synthetic resin pipe joint with an insert. FIG. 6 shows another embodiment of the present invention and is an explanatory view showing a cross section of a synthetic resin pipe joint with an insert.

In the embodiment shown in FIGS. 1 to 4, A is a synthetic resin pipe joint with an insert, and the synthetic resin pipe joint A with an insert has an annular screw fitting 1 embedded in the inner surface of a synthetic resin pipe joint 2. Has been done. As shown in FIG. 1, the annular screw fitting 1 is provided with a screw 11 for screwing a water faucet on its inner surface. Further, a thin-walled projection 12 protruding forward is provided at the tip of the annular screw fitting 1. Three
Is an O-ring made of synthetic rubber, and this O-ring 3 is located at the front end of the boundary between the synthetic resin pipe joint 2 and the annular screw fitting 1, and is thin at the end of the annular screw fitting 1. The protrusion 12 is curved and the O-ring is pressed, so that the boundary tip end is watertight.

Next, a method of manufacturing the synthetic resin pipe joint with insert will be described. The annular screw fitting 1 shown in FIG. 1 is mounted in a mold of an injection molding machine, and the molten synthetic resin is injected onto the outer peripheral surface of the annular screw fitting 1, and
With an insert in which an annular threaded metal fitting 1 is embedded in the inner surface of a synthetic resin pipe fitting 2 as shown in, and a gap 4 is formed between the thin projection 12 of the annular threaded metal fitting 1 and the synthetic resin pipe fitting 2. The synthetic resin pipe joint body A1 is manufactured.

Next, as shown in FIG. 3, the synthetic resin pipe joint body A1 with an insert is used to form an outer cylinder 51 and an inner cylinder 5 of a jig 5.
2 and inserts an O-ring 3 into the gap 4 between the protrusion 12 of the annular screw fitting 1 and the tip of the synthetic resin pipe fitting 2, and expands inward of the protrusion 12 of the annular screw fitting 1. Core 6
And the conical diameter-expanding core 7 is inserted into the expansion core 6 to expand the expansion core 6, and the protrusion 12 is curved outward. Then, as shown in FIG. 4, the synthetic resin pipe fitting 2
It is possible to manufacture the synthetic resin pipe joint A with an insert in which the O-ring 3 is water-tightly sandwiched between the tip of the boundary between the ring-shaped screw fitting 1 and the curved projection 12.

In the synthetic resin pipe fitting A with an insert thus manufactured, an O-ring is watertight at the boundary between the synthetic resin pipe joint 2 and the annular screw fitting 1 where tap water conventionally leaks. Because it is pinched, tap water does not seep out.

Next, the embodiment shown in FIG. 5 will be described. In the synthetic resin pipe fitting Aa with an insert shown in the embodiment of FIG. 5, a screw 11a into which a water faucet is screwed is bored on the outer peripheral surface of an annular screw fitting 1a, and a thin projection 12a has a synthetic resin pipe. A gap 4a is formed by projecting outward at a position away from the tip of the joint 2a, and the O-ring 3a inserted into the gap 4a has a thin projection 12a curved backward. It is different from the embodiment shown in FIGS. Others are Figure 1
It is the same as the embodiment shown in FIGS.

Next, the embodiment shown in FIG. 6 will be described. In the synthetic resin pipe fitting Ab with insert shown in the embodiment of FIG. 6, the thin projection 12b of the annular screw fitting 1b is provided so as to project outward at a position away from the tip of the synthetic resin pipe joint 2b, and the gap 4b is formed. Being formed, this gap 4
The O-ring 3b inserted in b is a thin projection 12
It is different from the embodiment shown in FIGS. 1 to 4 in that b is clamped by being bent backward. Others are the same as the embodiment shown in FIGS. 1 to 4, and the operation is also the same.

[0016]

EFFECTS OF THE INVENTION In the synthetic resin pipe fitting with insert of the present invention, an O-ring made of a soft material is water-tightly pressed at the tip of the boundary between the synthetic resin pipe joint where the tap water has exuded and the annular screw fitting. The tap water does not seep out. or,
According to the method for manufacturing the synthetic resin pipe fitting with an insert of the present invention, an annular screw fitting having a thin projection at its tip is manufactured in the same manner as in the prior art. At that time, a gap is formed between the annular screw fitting, the protrusion, and the tip of the synthetic resin pipe joint. After that, an O-ring made of a soft material is inserted into the gap between the protrusion of the annular screw fitting and the tip of the synthetic resin difficult joint, and the protrusion is only curved, so the manufacturing method is simple. As described above, the present invention is valuable because the present invention is a synthetic resin pipe joint with an insert in which tap water does not seep out and a manufacturing method capable of easily manufacturing the synthetic resin pipe joint with an insert.

[Brief description of drawings]

FIG. 1 shows an embodiment of a method for manufacturing a synthetic resin pipe fitting with an insert of the present invention and a manufactured synthetic resin pipe fitting with an insert, and an explanatory view showing a cross section of an annular screw fitting used in the manufacturing method. Is.

FIG. 2 is an explanatory view showing a synthetic resin pipe joint body with an insert provided by injecting synthetic resin on the outer peripheral surface of the annular screw fitting shown in FIG.

FIG. 3 is an explanatory view showing a state where the projection of the annular screw fitting of the synthetic resin pipe joint body with an insert shown in FIG. 2 is curved.

FIG. 4 is an explanatory view showing a cross section of a synthetic resin pipe joint with an insert.

FIG. 5 shows another embodiment of the present invention and is an explanatory view showing a cross section of a synthetic resin pipe joint with an insert.

FIG. 6 shows another embodiment of the present invention and is an explanatory view showing a cross section of a synthetic resin pipe joint with an insert.

[Explanation of symbols]

A, Aa, Ab Synthetic resin pipe joint with insert A1 Synthetic resin pipe joint body with insert 1, 1a, 1b Annular screw metal fitting 11, 11a Screw 12, 12a, 12b Protrusion 2, 2a, 2b Synthetic resin pipe joint 3 3a, 3b O-ring 4, 4a, 4b Gap between synthetic resin pipe joint and projection 5 Jig 51 Outer cylinder 52 Inner cylinder 6 Expansion core 7 Expansion core

Claims (2)

[Claims] 1. A synthetic resin pipe fitting with an insert, in which an annular screw fitting is embedded in the inner surface of a synthetic resin pipe fitting, wherein a thin-walled curved projection is provided at the tip of the annular screw fitting, A synthetic resin pipe joint with an insert, wherein an O-ring made of a soft material is watertightly sandwiched between a curved projection and a boundary end portion between the pipe joint and the annular screw fitting. 2. An annular screw fitting having a thin projection at its tip is mounted in a mold of an injection molding machine, and a synthetic resin melted is injected onto the outer peripheral surface of the annular screw fitting to synthesize it. After manufacturing the synthetic resin pipe fitting body with insert, in which the annular screw metal fitting is embedded in the inner surface of the resin pipe fitting, and a gap is formed between the protrusion of the annular screw metal fitting and the tip of the synthetic resin pipe fitting. Inserting an O-ring made of a soft material into the gap formed between the projection of the annular screw fitting and the tip of the synthetic resin pipe joint, and bending the projection provided at the tip of the annular screw fitting. With an insert, the O-ring made of a soft material is water-tightly clamped between the curved projection and the tip of the boundary between the synthetic resin pipe joint and the annular screw fitting. Manufacturing method of synthetic resin pipe joint.