| 摘要 |
<p>PROBLEM TO BE SOLVED: To enhance controllability by enabling a movable locking piece to move back radially outwards from a locking groove to allow removal of a plug, and enabling the plug to be connected simply by insertion of the plug into an inner cylinder and by displacement of the inner cylinder in the same backward direction as the direction of insertion. SOLUTION: When a plug P is inserted into an inner cylinder 23 and displaced backwards, an outer cylinder 33 is released from a control ball 22 (movable control piece) and displaced forwards and a lock ball 29 (movable locking piece) is pushed radially inward by the outer cylinder 33 and held in engagement state with a locking groove 10 to thereby lock the plug P in a connected state. When the outer cylinder 33 is displaced backwards from the connected state, the inner cylinder 23 is released from the control ball 22 and displaced forwards and the lock ball 29 is released from the state of being held by the outer cylinder 33 into an unlocked state in which it can move back radially outwards from the locking groove 10 to allow removal of the plug P. The plug P can be connected simply by inserting and pushing the plug P into the inner cylinder 23 without the need for the outer cylinder 33 to be displaced to the unlocked position, so that controllability is good.</p> |
