| 摘要 |
PROBLEM TO BE SOLVED: To provide an earthquake resistant pipe fitting with a socket outside portion 2b having improved breaking strength and flexibility. SOLUTION: One splitting tight lock ring 13 is movably fitted into an annular groove 15 of a spigot 1 and a lock ball 11 is provided in an annular groove 12 of the socket 2, and the lock ball and the lock ring abut with each other at their circular faces. In this way, two lock members exist where the lock ball has a sufficient diameter to abut on the lock ring and the groove storing the lock ball has a sufficient depth to make the spigot pass when storing it and to absorb the larger diameter of the lock ring. Thus, the socket side lock member storage groove can be shallower than that of a PII type fitting, and so the pipe thickness of the socket in its groove area can be thicker, thereby achieving higher breaking strength. When the spigot is bent in the socket, its abutting point is moved along the circular face of the lock ball to allow the bending, therefore achieving smooth bending. COPYRIGHT: (C)2006,JPO&NCIPI
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