| 摘要 |
PROBLEM TO BE SOLVED: To make the pin holes for a cotter pin of the two joints coincide with each other without fail when male and female joints are fitted in each other. SOLUTION: In male and female joints to be a male joint 9 consisting of a square plug 10 and a female joint 11 comprising a removable square hole socket 12 and pin holes 14 and 15 transversely formed through the male and female joints, during fitting wherein the pin holes 14 and 15 of the male joint 9 and the female joint 11 are caused to coincide with each other, a positioning protrusion 16 is protruded from the tip part of the side of one joint and a guide groove 17 with which the positioning protrusion 16 is slidable engaged and which is extended in parallel to an axis from the tip of a side is formed in the side, corresponding to the positioning protrusion 16, the sides of the other joint. |
