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US 3,999,411 AGranted
Lock knob control mechanism
AssigneeFolger Adam Co., Division of Telkee, Inc.
InventorRaymond V. Kambic
Life of this patent
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AssigneeFolger Adam Co., Division of Telkee, Inc.
InventorRaymond V. Kambic
Estimating the term…
Lock knob control mechanism comprising a three-piece cam assembly made up of a central cam actuator and two outside knob guides that may be selectively assembled to make the two knobs at opposite sides of a door active or inactive. An inactive knob guide makes its knob nonrotatable. An active knob guide cooperates with the central cam actuator and a locking pawl that prevents rotation of its knob but may be rendered inoperative electrically from a remote point by authorized personnel or mechanically in response to actuation of the key for that lock. The knob control also includes a retainer for securing a knob in place on the door which can be released only when the door is open, with a rose for the knob secured to the door by screws that are covered by the knob so that with the door closed there are no visible means for removing the knob.
In a lock having a casing mountable in a door, a latch bolt mounted in and extending from said casing, deadlatch mechanism operative when the door is closed to prevent retraction of said bolt, key-operable mechanism for rendering said deadlatch mechanism inoperative and retracting said bolt, and a knob mounted on said lock at each side of the door;
In a lock having a casing mountable in a door, a latch bolt mounted in and extending from said casing, deadlatch mechanism operative when the door is closed to prevent retraction of said bolt, key-operable mechanism for rendering said deadlatch mechanism inoperative and retracting said bolt, and a knob mounted on said lock at each side of the door;
Dependencies are inferred from the claim text.