发明名称 |
METHOD FOR PRODUCING PIPING JOINT, MOLD THEREFOR, AND PIPING JOINT TO BE OBTAINED BY THE METHOD |
摘要 |
PROBLEM TO BE SOLVED: To obtain a piping joint having a flat O-ring mounting place and free from parting line and to omit a cutting process for eliminating the parting line. SOLUTION: An annular member 32 concentrically circular to a screw core 31 is integrally formed at the upper end of the screw core 31 incorporated in a split mold 33 and the inner surface of the annular member 32 is formed into a stepped shape and a screw is formed to the small diameter part 32a of the member 32 and a flat circumferential surface is formed to the large diameter part 32b of the member 32. After molding, when the screw core 31 is revolved to be pulled out, a place wherein an O-ring is mounted corresponds to the large diameter part 32b to become a flat circumferential surface free from a parting line. |
申请公布号 |
JPH10225958(A) |
申请公布日期 |
1998.08.25 |
申请号 |
JP19970030353 |
申请日期 |
1997.02.14 |
申请人 |
MITSUI CHEM INC |
发明人 |
MIKAWA MITSUHARU |
分类号 |
F16L25/00;B29C33/14;B29C45/14;B29L31/24;(IPC1-7):B29C45/14 |
主分类号 |
F16L25/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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