Lock for fire doors
AssigneeWalter Kidde & Company, Inc.
InventorRichard J. Ohno
Life of this patent
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Abstract
A surface mounted rim type lock set assembly for use on fire doors wherein a latch bolt is adapted for release by operation of a cross-bar on one side of the door and for release independently by manual operation of a lever-type handle on the other side, the assembly including a locking slide which is held out of engagement with the handle hub by heat responsive means adapted to release the slide when a portion of said means is melted. Normal locking and unlocking of the handle is effected by a key in a cylinder lock.
Claims9
In a fire door lock set wherein a latch bolt is adapted for actuation by a spindle, a lever handle fixed on the spindle, a locking hub fixed on the spindle, a locking slide having a portion movable vertically into and out of engagement with said hub, key actuated means for moving the slide, resilient means for holding the slide in disengaged position and a heat responsive element operatively associated with said resilient means in a position to render the resilient means inoperative upon the melting of said element.
Dependencies are inferred from the claim text.