| 摘要 |
<p>The upper end of a slip-off preventive lever (21) is supported by the support wall (15) of a main body (3) so that it can be substantially longitudinally turned and laterally moved within a fixed range, and a composite spring (41) urges the slip-off preventive lever (21) forward (to the closed position side) while the coil (43) of the spring (41) urges the slip-off preventive lever (21) leftward (to the locked position side). With the slip-off preventive lever (21) assuming the locking position, the stop edge (27b) of its arm (27) comes close to the stop surface (11a) of the main body (3) from the front to be prevented from turning rearward (to the open position side). Therefore, pushing the slip-off preventive lever (21) somewhat rightward to disengage the stop edge (27a) from the stop surface (11a) and then pushing it backward results in the lever (21) being turned to the open position; thus, there will be no possibility of the slip-off preventive lever moving to the open position unless two forces act at the same time.</p> |
