Patent ID: 8308202

Claim:
A separation prevention device for a pipe joint which prevents a receiving opening and an inserting opening which is inserted into and connected to the receiving opening from being separated from each other in an axial direction of a pipe to be joined by the pipe joint, comprising: disengagement prevention members which are disposed at a plurality of locations in a circumferential direction of the pipe, on an inner peripheral surface of an engaging tool which is engaged with the receiving opening in a state where the receiving opening is fitted over the inserting opening or on an inner peripheral surface of the receiving opening itself, and which is formed with claws capable of biting into an outer peripheral surface of the inserting opening; and a press member which presses the disengagement prevention member radially inward of the pipe and which engages the claw with the outer peripheral surface of the inserting opening, wherein the claw of the disengagement prevention member and a claw of an adjacent disengagement prevention member which is adjacent in the circumferential direction of the pipe are arranged so as to overlap on each other when viewed in the axial direction of the pipe in a state where the claws are engaged with the outer peripheral surface of the inserting opening, wherein the disengagement prevention members disposed at the plurality of locations in the circumferential direction of the pipe are accommodated in an annular groove which opens toward the inserting opening in the inner peripheral surface of the engaging tool or the receiving opening itself.