Patent ID: 8573654

Claim:
A pipe joint in which a spigot formed at an end of one pipe is inserted into a socket formed at an end of another pipe, the pipes being joined to each other, the pipe joint comprising: a lock ring accommodating groove formed on an inner circumference of the socket; a lock ring accommodated in the accommodating groove and singularly divided in a circumferential direction; an annular centering member disposed between an inner circumferential surface of the accommodating groove and an outer peripheral surface of the lock ring, for holding the lock ring centered with respect to the socket when the spigot is not inserted into the socket; and a protrusion which is formed on an outer periphery of a distal end of the spigot, is capable of elastically pushing out the lock ring accommodated in the accommodating groove with the spigot inserted into the socket in a pipe diameter direction to pass through an inner circumference side of the lock ring, and is capable of being engaged with the lock ring from an inner side of the socket when a detachment force is applied in a pipe axial direction between the socket and the spigot joined to each other to prevent the spigot from being detached from the socket, the centering member including a plurality of divided parts in a pipe circumferential direction, and a connecting part connecting the adjacent divided parts in the pipe circumferential direction, the divided part including a holder holding the lock ring from an outer peripheral side, and a hold width protruding inward in the diameter direction from a socket inner side portion of the holder so as to be engaged with the lock ring in the pipe axial direction, wherein the connecting part is disposed closer to an outer peripheral side than the divided parts and is elastically deformable in the pipe diameter direction in response to the elastically pushed-out lock ring.