| 摘要 |
In a door hinged to a frame having a locking channel pivotally mounted upon a vertical axis upon its closing edge aligned with the door and interlocked with an elongated engaging element upon the frame, the channel being sufficiently movable relative to the door that it disengages the engaging element so that the door may open, and a blocking member movably mounted upon the door in one position retaining the channel in a locked position when the door is closed and movable to a release position; the improvement comprising; a lever or knob rotatably mounted upon the door and a linkage movably mounted upon the door interconnecting the lever or knob with the blocking member for moving the blocking member to its release position so that the channel moves to disengage the engaging element. The linkage includes a clutch operated actuator pivoted upon the door in operative engagement with the blocking member. Between a pair of symmetrical escutcheons are a pair of lever mounting rotatable hubs which support a pivotal clutch selectively connectable to the hubs. A turnpiece hub controls locking and unlocking of the door and a lock cylinder selectively engages the turnpiece hub.
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