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    • 14. 发明专利
    • CORROSIONPROOF CORE OF PIPE JOINT
    • JPH09250683A
    • 1997-09-22
    • JP9037596
    • 1996-03-18
    • KURIMOTO LTD
    • KITAGAWA MASAYOSHINAKANO RYOICHITOYOSHIMA HIROYOSHISHIOMI ICHIRO
    • F16L58/18
    • PROBLEM TO BE SOLVED: To solve a problem that a corrosion propagates from a cutting part exposing the metal, when a cut pipe made made by cutting a standard cast iron pipe is used in the laying and the repairing of a pipe line for water supply. SOLUTION: A corrosionproof core 2 consisting of a cylindrical body 3 which can be inserted in a cast iron pipe 1A; a central projection line 4 formed at the center of the periphery of the cylindrical body 3; and flexible circular fins 5 whose tips project higher tan the inner diameter d of the cast iron pipe symmetrically at a fixed interval to both sides of the center projection line line 4; is all formed in a unitary structure, by the injection molding of a flexible plastic material. As a result, it has an adequate flexibility and strength, and even though the pipe line has an uneven size of the cast iron pipe or a bending form, the core 2 is bent following the inner circumferential surface of the pipe, and adsorbs the uneven size and the bending. The flexible circular fins are deformed elastically flexibly and closely contacted on the inner circumferential surface of the pipe, so as to maintain the corrosionproof function to the cast iron pipe. They have no joint or no sticking, and exchange the unitary elastic deformation and the supplimentation of the material force each other constantly, so as to solve the problem.