| 摘要 |
<p>PROBLEM TO BE SOLVED: To dispense with a movable connecting pin so as to reduce the number of parts and so as to prevent a defective action by switching a connection lever between a connection position, in which a lock/unlock operation force can be transmitted to an operation lever, and a double lock position, in which this operation force cannot be transmitted, by means of a double lock lever. SOLUTION: A double lock mechanism is constructed of a connection lever 61, which is supported in an operation lever 60 freely oscillationally and removably engaged with an operation lever 65, and a double lock lever 66 interlocking with the connection lever 61. The double lock lever 66 interlocks with a motor 53 serving as a driving source and switches the connection lever 61 between a connection position, in which a lock/unlock operation force can be transmitted from the operation lever 65 to the operation lever 60, and a double lock position, in which transmission of the lock/unlock operation force is prevented because the operation lever 65 hits the air. In this way, a defective action caused when the operation lever 60 is turned so as to be moved from the double lock position to the connection position can be prevented.</p> |
