| 摘要 |
<p>A drive mechanism section is placed on a frame (2) covered by a cover (3). A dead lock mechanism (20) has an engagement hole (21) formed in a lock rod (14), a lock pin (23) placed on the frame (2) side, engaged with the engagement hole (21), and urged to the side of a lock position and also has a trigger member (25) fixed to the cover (3) and preventing movement of the lock pin (23) to the lock position. When the cover (3) moves in the direction of separation from the frame (2), the trigger member (25) is displaced in a pin releasing direction and the lock pin (23) is engaged with the engagement hole (21). The cover (3) is provided with weak sections (7, 8, 9) that are weak strengthwise, and the weak sections (7, 8, 9) are at positions that surround portions to which the trigger member (25) is fixed and at positions that are in the periphery of a portion in which the frame (2) is fitted.</p> |
