| 摘要 |
A plug includes an inner pipe in which an external electric cable is installed; and an outer pipe supporting the inner pipe therein via an elastic member such that the inner pipe can move in the outer pipe in a withdrawal direction, the outer pipe being provided with a first locking portion for locking the plug to the socket. A socket accompanied by an electric circuit, the inner pipe being inserted into the socket so that the electric circuit is electrically connected to the electric cable, the inserting being performed in an inserting direction opposite to the drawing-out direction. A fixed block fixed to a base on which the socket is also fixed, however the construction consisting of the fixed block, socket and base is made so that an external force applied to the fixed block cannot be directly applied to the socket, the fixed block being provided with a second locking portion to be fitted to the first locking portion so that the plug is locked to the fixed block.
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