Abstract: An improved locking device is provided for use on a pair of panic doors. The locking device includes an actuating bolt including a triangularly-shaped body and being formed with a stopper portion and a recessed portion; a curved pivotabie member which is formed with a pair of opposite guide pegs slidably abutting on the stopper portion on the actuating bolt and is pivotably turnable when the actuating bolt is being pushed inwards; a movable tube which is axially movabvle when the curved pivotable member is being pivotally turned; a slidable bar which is slidable with the axial movement of the movable tube; and a latching bolt linked to the slidable bar so that when the slidable bar is moved the latching bolt is protruded out of the locking device to lock the paired panic doors.

Abstract: Disclosed is a door lock for locking a double-swinging type fire protection door. The door lock has a safety device controlled by a melting heat sensitive element to lock the spring bolt of the lock bolt in the locked position when the ambient temperature is sharply increased due to a fire.