Patent ID: 8979137
Filing Date: 2015-03-17
Classification: F16L

Abstract:
1. A coupling ring, comprising: a series of unit members configured so that the unit members adjacent to each other are rotatably coupled to each other; and a fastener coupling unit members on both ends of the coupling ring, wherein a concave groove extending circumferentially is externally fitted onto an outer circumference of each of two opposing flanges, the unit members on both ends are coupled to each other by the fastener when the coupling ring is in an annular state, the fastener presses an inclined surface formed on a side surface of the concave groove and inclined surfaces formed on rear surfaces of the respective flanges together, and the series of unit members includes three unit members, and a stopper member is provided on the unit members on both ends to restrict a separation angle between the unit members on both ends and an intermediate unit member located intermediate the unit members on both ends to fall within a certain angle in an open state in which the unit members on the both ends are not coupled to each other by the fastener, and a flat surface of the stopper member abuts a flat surface of the intermediate unit member, and the stopper member is provided on an outer periphery of the unit members on both ends and protrudes outwards from the intermediate unit member when viewed from a rotating axis direction of the unit members on both ends in a state that the unit members on both ends are closed.