External latch structure for locking a door in different positions

摘要

Locking mechanism for locking and unlocking a sliding-type door. The mechanism for the most part is mounted externally of the door, and includes a pivoted, frame-mounted locking member pivotable between locking and unlocking positions. A dead latch latches the locking member in its locking position. An air cylinder is actuated, first to release the dead latch, and then to shift the locking member to its unlocking position. A door-carried locking member also is provided for locking the door at a region remote from the region locked by the frame-mounted locking member.