Locks – Operating mechanism – Key
Patent
1984-07-02
1986-07-08
Wolfe, Robert L.
Locks
Operating mechanism
Key
70375, 70377, 70452, E05B 2904
Patent
active
045985634
ABSTRACT:
The cylinder lock has a key guide which has a cylindrical extension fitting inside a cylindrical shell. A number of tumblers fit in the tumbler plug which is mounted inside the extension so the lock tab on each tumbler can project through a slot in the extension into one of two lock grooves inside the shell. The cam surface on the proper key will move the lock tabs out of the groove so the key guide and the plug and the tumblers can rotate in unison inside the shell. The tumbler plug engages a bolt driver which is journaled in and projects rearwardly from the shell. The projecting portion is threaded and has a squared portion on which a bolt is mounted and retained by a nut threaded on the threaded portion. The shell is threaded and also has opposed flats registering and lock relative to a bracket which enables mounting the lock on the rear of a door with an escutcheon plate on the front of the door. Bolts project from the rear of the escutcheon plate through holes in the door and in the bracket for retention by nuts. With such an arrangement the lock is protected behind the escutcheon plate to prevent the key being removed in the unlocked position.
REFERENCES:
patent: 1218065 (1917-03-01), Diesel
patent: 1644092 (1927-10-01), Shinn
patent: 1987735 (1935-01-01), Falk
patent: 3263461 (1966-08-01), Tartaglia
patent: 3555859 (1971-01-01), Berkowitz
patent: 4052870 (1977-10-01), Degeye et al.
patent: 4237712 (1980-12-01), Cramer
patent: 4316371 (1982-02-01), Del Nero
patent: 4326396 (1982-04-01), Steinbach
patent: 4328690 (1982-05-01), Oliver
Gall Lloyd A.
Michael Bayard H.
Wolfe Robert L.
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