JP3082273U - Synthetic resin pipe fittings - Google Patents

Abstract

The object of the present invention is to prevent unnecessary burrs from being generated at the gate portion of a joint, eliminate post-processing, and provide a pipe joint having excellent appearance and a high product acceptance rate. is there. A submarine gate (1) has a parting surface (11) of a mold (10) in the direction of a pipe axis (2) of a synthetic resin pipe joint (1).
In the pipe joint 1 injection-molded in 2, the gate outlet 3 of the pipe joint 1 is formed on a tangential plane 4 of the pipe outer peripheral surface of the pipe joint 1.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a pipe joint made of synthetic resin.

[0002]

[Prior art]

 Conventionally, for plastic joints, thermoplastic synthetic resin such as vinyl chloride resin is melted in an injection molding machine, injected into the joint-shaped cavity from the mold gate, cooled, solidified, molded, and then molded. Release from mold. At this time, if the gate is a submarine gate (also called a tunnel gate), the gate of the fitting will be automatically cut by the edge of the mold gate when the mold is opened. There is an advantage that there is no need to do this.

[0003]

[Problems to be solved by the invention]

 However, as shown in FIG. 5, when the gate outlet is provided on the cylindrical curved surface of the pipe joint, the submarine gate is cut along the dotted line G with the mold opening, and sharp burrs are generated on the product surface. Therefore, there was a problem that burrs had to be cut by post-processing.

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to prevent unnecessary burrs from being generated at a gate portion of a joint, to eliminate post-processing, and to provide an excellent appearance. To provide a pipe joint with a high product acceptance rate.

[0005]

[Means for Solving the Problems]

 According to the present invention, there is provided a pipe joint formed by injection molding with a submarine gate in which a parting surface of a pipe fitting mold is provided in a pipe axis direction of a pipe joint made of synthetic resin. The pipe is formed on a plane tangential to the outer peripheral surface of the joint.

[0006]

According to the first aspect of the present invention, there is provided a pipe joint made of a synthetic resin pipe having a parting surface of a pipe joint mold in a pipe axis direction. Is formed not on a cylindrical curved surface but on a plane tangential to the pipe outer peripheral surface of the pipe joint, so when the pipe joint mold is opened, along the plane around the joint gate outlet, At the gate edge of the mold, the gate is not cut and no extra burr occurs. Further, a base including a plane in the tangential direction of the pipe outer peripheral surface in the cross section of the pipe joint body is formed.

[0007]

[Embodiment of the invention]

 An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a pipe joint (socket) according to an embodiment of the present invention in a mold. In FIG. 1, 1 is a pipe joint, and 10 is a mold of the pipe joint 1. 10A is a movable mold, 10B is a fixed mold, and 10C is a slide core. There is a mold parting surface 11 on the plane of the pipe joint 2 in the direction of the pipe axis 2, and the pipe joint 1 is injection molded from the submarine gate 12 to the cavity 14 of the pipe joint 1 using impact-resistant vinyl chloride resin. I have.

Around the gate outlet 3 of the fitting 1, the parting surface 11 of the dies 10 A and 10 B of the fitting 1 is moved from the parting surface 11 to one side in the tangential direction of the outer peripheral surface of the fitting 1. 2, a rectangular plane 4 is formed vertically, and as shown in FIG. 2, the base 5 is formed by the plane 4 and the inclined surfaces 6A, 6B, 6C reaching the cylindrical curved surface of the pipe joint 1 from the plane 4. Have been.

After the completion of the cooling step of the injection molding, the pipe joint 1 moves together with the movable mold 10A and the slide core 10C attached to the movable mold 10A in a direction (arrow) perpendicular to the parting surface 11. Then, the mold 10 is opened. At this time, since the pipe joint 1 is separated from the fixed mold 10B, the base 13 around the gate outlet 3 of the pipe joint 1 is formed by the edge 13 of the fixed mold gate exit having a surface perpendicular to the parting surface 11. The submarine gate 12 is cut along the plane 4 of the part 5. Further, the slide core 10C slides and is separated from the pipe joint 1, and is further protruded from the movable mold 10A by a protruding pin (not shown). The pipe joint 1 is released from the mold 10 without generating unnecessary burrs. Taken out.

FIG. 2 is a perspective view of the pipe joint (socket) of FIG. In FIG. 2, a parting line 7 is formed on the surface of the pipe joint 1 along the parting surface 11 of the mold 10. The plane 4 starts from the parting line 7 and includes the gate outlet 3 of the fitting 1 and extends tangentially to the outer peripheral surface of the pipe. The base 5 is formed by the plane 4 and the planes 6A, 6B, and 6C.

In the plane 4 including the gate outlet 3, the length from the parting line 7 to the gate outlet 3 and the gate diameter vary depending on the shape of the molded product, but the length of the plane extended from the gate outlet 3 is different. It is preferable that the thickness be approximately 0.1 to 3 times the gate diameter.

FIGS. 3 and 4 show another embodiment of the present invention, and FIG. 3 is a perspective view of a pipe joint (elbow) 21. From the parting line 27 of the pipe joint 21, a semi-elliptical flat surface 24 including a gate outlet 23 is formed tangentially to the outer peripheral surface of the pipe of the pipe joint 21, and constitutes a base 25. FIG. 4 is a perspective view of the pipe joint (cheese) 31, and a semicircular flat surface 34 including a gate outlet 33 is formed from a parting line 37 of the pipe joint 31 in a tangential direction of a pipe outer peripheral surface of the pipe joint 31. Thus, the base 35 is constituted.

In addition, the present invention may be a molded product including a pipe shape such as a plug of a drainage basin and a part of a branch pipe of a drainage pipe.

[0014]

[Effect of the invention]

 The synthetic resin pipe joint according to the first aspect does not generate extra burrs and does not require post-processing, so that the cost can be reduced. In addition, there is no unnecessary protrusion of the base, and the appearance is excellent.

[Brief description of the drawings]

FIG. 1 is a sectional view of a pipe joint in a mold according to an embodiment of the present invention.

FIG. 2 is a perspective view of the pipe joint (socket) of FIG. 1;

FIG. 3 is a perspective view of a pipe joint (elbow) according to another embodiment of the present invention.

FIG. 4 is a perspective view of a pipe joint (cheese) according to another embodiment of the present invention.

FIG. 5 is a sectional view of a conventional pipe joint in a mold.

[Explanation of symbols]

 1, 21, 31 pipe joint 2 pipe axis 3, 23, 33 gate outlet 4, 24, 34 plane 10 mold 11 parting surface

Claims (1)

[Utility model registration claims] A parting surface of a pipe joint mold is provided in a pipe axis direction of a pipe joint made of synthetic resin. In a pipe joint injection-molded with a submarine gate, a gate outlet of the pipe joint is provided at a pipe outer periphery of the pipe joint. A pipe joint formed on a plane tangential to the surface.