| 摘要 |
A lock mechanism for an emergency exit door or the like is constructed with a tongue pivotable between two positions-an extended position and a retracted position, the former for use when the door is closed and locked, and the latter when the door is open-and a pawl arranged for releasably retaining the tongue in either or both of the two positions, the tongue being releasable from the pawl by depressing a breakable seal or by a cylinder key. The mechanism has the advantage of being readily releasable from the inside yet capable of being sealed against unauthorized use.
|
