Locks – Operating mechanism – Key
Patent
1982-07-23
1985-04-23
Wolfe, Robert L.
Locks
Operating mechanism
Key
70377, 70369, 70407, E05B 1514, E05B 1902, E05B 2902
Patent
active
045121664
ABSTRACT:
A lock of the cylinder type having a plurality of discs forming part of the barrel assembly and being rotatable relative to one another and to the body of the barrel assembly. The rotational axis of each disc is substantially coincident with the rotational axis of the complete barrel assembly and each disc has a keyway forming opening which contains that axis. Locking means such as a side locking bar is operative to hold the barrel assembly against rotation relative to the lock cylinder, but that locking means is responsive to the rotational positioning of the discs to release the barrel assembly for rotation when the discs have a particular rotational position relative to one another. The barrel assembly can be rotated in either direction away from the normally locked condition. A key for use with such a lock has an elongate blade which is of non-circular cross section and is twisted to create a plurality of relatively angularly disposed locating portions which are spaced apart longitudinally of the blade. Each locating portion is adapted to cooperate with a respective disc to hold that disc in the aforementioned particular rotational position. The hand of twist is reversed at least once along the blade length and sloping camming surfaces on the blade promote radial movement of the discs as the blade is moved through the lock keyway.
REFERENCES:
patent: 1589256 (1926-06-01), Spruth
patent: 3771340 (1973-11-01), Krakstrom
Dunphy Gerald F.
Newman Donald J.
Ogden Industries Pty. Ltd.
Wolfe Robert L.
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