| 摘要 |
<p>PURPOSE:To ensure a lock release by forming a lock-releasing means into a pantograph shape, of which four corners form revolute pairs, in the same manner as a closing frame and by releasing the engagement of a locking means with the closing frame. CONSTITUTION:A lock-releasing means 19 is fitted to the longitudinal link members 8V, 8V of a closing frame 8 via upper side lateral link members 22, 22 to perform a pantographic movement to rotate a locking means 16 downward, when it is subjected to an external force, and to automatically return to an original condition by the biasing force of extension springs 24, 24, when no external force is applied to it. Thus, it is possible to perform a lock release surely.</p> |
