PURPOSE: To facilitate connecting work by forming a projection to be engaged with the engaging groove of a leader on a receiver to be fitted to the outer circumference of the end part of the leader, and arranging the top end on the opening end side of the receiver of the projection on the deeper side from the opening end.
CONSTITUTION: A receiver 4 to be fitted to the outer circumference of the end part of a leader 1 is formed on one axial direction side, and an insert hole 5 to be fitted to the inner circumference of the end part of the leader 1 is formed on the other axial direction side. On a set of opposed side surfaces of the receiver 4, a pair of projections 6 capable of being fitted to the outside surfaces of the engaging grooves 2 of the leader 1 are formed in the positions corresponding to the engaging grooves 2, and the tapered top parts 6a on the opening end 4a side of the receiver 4 of the projections 6 are arranged on the insert hole 5 side to form a socket 3. At working, four corners of the leader 1 are matched with four corners of the receiver 4, the end part of the leader 1 is inserted to the receiver 4 of the socket 3, and the engaging grooves 2 are fitted to the projections 6.
KATO YUKIHIRO
TOYAMA TAKENAO
