JP2980864B

PROBLEM TO BE SOLVED: To prevent the falling of a pin due to vibration impact by forming a slit along the axial direction in one of or both of two truncated cone-shaped half body portions and by inserting and fitting a half body portion having a diameter of the tip portion larger than the diameter of the inner bottom portion of a pin receiving hole to the pin receiving hole. SOLUTION: A slit 8 along the axial direction is provided in one or both of truncated cone-shaped two half body portions 2, 3 of a coupling pin 1 jointed in a reverse direction on the same axis, and the diameter D1 of the half body portion 2 is set larger than the diameter D2 of the inner bottom portion of a pin receiving hole 6. When the half body portion 2 is fitted to the receiving hole 6, the inner side surface of the pin receiving hole 6 pushes the outer side surface of the half body portion 2, by which the slit 8 is closed. A drag due to a peculiar elasticity of the coupling pin acts between the inner side surface of the pin receiving hole 6 and the outer side surface of the half body portion 2, and a member 4 stably connect and hold the coupling pin 1 by the frictional force created by the drag, and a possibility of the falling due to vibration impact can be eliminated.