| 摘要 |
PROBLEM TO BE SOLVED: To provide a structure of a joint portion capable of moving an insertion port to a lock ring while smoothly sliding in a pipe axial center direction, and improving flexibility of the joint portion.SOLUTION: In a structure of a joint portion 1 in which a lock ring 10 is accommodated in a lock ring accommodation groove 7 formed on an inner surface of a receiving port 4, and a projecting portion 11 formed on an outer surface of an insertion port 5 is brought into contact with the lock ring 10 from a receiving port depth side in a separation direction A of the insertion port 5 to prevent the insertion port 5 from separating from the receiving port 4, an outer surface of the lock ring 10 has a circular arc shape when observed from a cross-sectional view, at a first contact place P1 where the lock ring 10 and the outer surface 5a of the insertion port 5 are kept into contact with each other.SELECTED DRAWING: Figure 1 |
