| 摘要 |
PROBLEM TO BE SOLVED: To provide a movement prevention means which maintains an engagement state of an annular body and a socket end without requiring a special means and always prevents the separation of a spigot end and the socket end in the direction of the axis of conduit. SOLUTION: The movement prevention means includes at least a pressing part 4e, which presses a sealing member 7 between a bulged part 6c and itself in the direction of axis of conduit, and a locking part 9 which is locked on the outside circumferential surface 5b of the spigot end 5 in a state that the pressing part 4e is pressing the sealing member 7, has the annular body 4 provided on the spigot end 5 along the circumferential direction, and prevents the relative movement of both ends 5, 6 in the direction of the axis of conduit. A pair of engagement parts 4g, 6d are provided to prevent the separation of the annular body 4 and the socket end 6 in the direction of the axis of conduit by making the annular body 4 and the socket end 6 engage with each other. The pair of engagement parts 4g, 6d are configured to engage with each other in the direction of the axis of conduit by the sealing member 7 pressed between the bulged part 6c and the pressing part 4e. COPYRIGHT: (C)2011,JPO&INPIT |
