| 摘要 |
PURPOSE:To provide a coupling structure which can prevent loosening of the coupling part completely without lowering current-carrying performance. CONSTITUTION:Rotation prevention member 2 is installed between the male screw part of a projecting needle 1 and a female screw part of a coupling 3. The fixed end 2a of the rotation prevention member 2 is fixed to the projecting needle 1 and the rotation prevention end 2b abuts on the surface of the female screw part of the coupling 3. When the projecting needle 1 is rotated in A direction, the outer circumference of the rotation prevention member 2 slides while abutting on the surface of the female screw part of the coupling 3 so as to make rotation in A direction possible and in the case of rotating in B direction, the rotation prevention end 2b bites the surface of the female screw part of the coupling 3 so as to prevent rotation. |
