Patent ID: 7195286

Claim:
A tube joint comprising: a body proper being formed into a cylindrical shape, said body proper having an axially outer open end, through which a tube is inserted; and a locking member being provided in said body proper, said locking member locking the tube in said body proper, wherein said locking member includes: a ring section having an outer circumferential part sliding on an inner circumferential face of said body proper and being capable of moving in an axial direction of said body proper; a plurality of flexible extended sections extending axially outwardly from the ring section toward the one open end of said body proper; and a plurality of claw sections being respectively formed at axially outer front ends of the flexible extended sections and radially projected inward therefrom, and wherein said body proper has a tapered section, whose inner diameter is gradually reduced in the axially outer direction toward the open end and which reduces a diameter of the front ends of the flexible extended sections when said locking member is moved axially outwardly toward the open end and the front ends of the flexible extended sections enter the tapered section, whereby the claw sections bite and lock the tube, the front ends of the flexible extended sections, when located at an axially inner side of the body proper with respect to the tapered section, move in a circumferential direction about the axis of the body proper due to a frictional force between the tube and the claw sections when the tube is turned about its axis by an external force, and return to initial positions due to elasticity of said locking member when the external force is removed, and an engaging mechanism allows the front ends of the flexible extended sections to enter the tapered section when the front ends are located at the initial positions, and engages with the front ends to prevent their entry into the tapered section when the front ends are moved in the circumferential direction of the body proper by the frictional force.