| 摘要 |
PROBLEM TO BE SOLVED: To provide a pipe joint structure capable of rotating a cap nut with small rotation torque when connecting a pipe.SOLUTION: A pipe joint structure including a cup nut 2, and a pipe joint body 5 having a protrusion cylinder part 4 with a male screw 3 to which the cup nut 2 is externally fitted includes a plurality of claw parts 7 protrudingly provided on an end surface 6 of the protrusion cylinder part 4. A pipe insertion hole part 8 of the protrusion cylinder part 4 is formed to be a tapered hole 9 of which diameter is slightly enlarged to an end direction, and by screwing and advancing the cup nut 2 toward the male screw 3, transition to a claw biting state is achieved while an end part 10 of the claw part 7 is pressure-contacted to a pipe outer peripheral surface 11 and a pipe end 12 is pushed and moved to an inner side of the joint body 5, and an end close contact state in which a pipe foremost end 13 is pressure-contacted to an inner peripheral surface 20 of the tapered hole 9 is achieved. |
