| 摘要 |
PROBLEM TO BE SOLVED: To provide a connection ring which has the superior strength. SOLUTION: The synthetic resin connection ring (1) produced by injection molding has a turning preventing portion (11) on an inner periphery of a main ring (10) to project to the inside of the ring. The main ring (10) is divided into a fixing side ring portion (13) to which the ring (1) is fixed and a connection side ring portion (12) which is connected to the ring (1) by the turning preventing section (11). A weld portion (W3) which keeps the resin injected in a mold fuses is formed in the fixing side ring section (13) and the connection side ring section (12) does not have the weld section. COPYRIGHT: (C)2007,JPO&INPIT
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