Locks – Operating mechanism – Key
Patent
1976-12-01
1977-12-06
Wolfe, Robert L.
Locks
Operating mechanism
Key
70 27C, 70399, 70DIG49, E05B 1912, E05B 2703
Patent
active
040610047
ABSTRACT:
A pick-proof lock cylinder and key therefor are described. The lock cylinder has a keyhole which opens to provide access to the cylinder, and two cam surfaces are provided at the remote end of the keyhole configurated to deflect a pair of coded, pivotally mounted fingers on a jointed key which is receivable within the keyhole. The revolving cylinder or tumbler includes a plurality of enabling pins or plungers which are generally spaced from each other along a direction substantially normal to the length direction of the keyhole. The fingers of the key may be mechanically or magnetically coded to cause the enabling pins or plungers to be actuated when the key is fully inserted into the keyhole and the coded fingers are deflected to their operative positions by the cam surfaces. Additionally, sensing or monitoring pins enable the proper actuation of the enabling pins or plungers only upon detection of a suitably coded key. Additional pick-proof pins are provided for preventing picking of the lock by indiscriminate actuation of all of the enabling pins or plungers. Provision is also made for alarm means which includes one or more switches arranged to sense the relative positions of the tumbler, the sensing or monitoring pins, as well as a plurality of additional sensing or alarm disabling rods whch are mounted for detecting a preselected code placed on the shank of the key.
REFERENCES:
patent: 1369449 (1921-02-01), Maksym
patent: 1438525 (1922-12-01), Godlewski
patent: 1567979 (1925-12-01), Northrop
patent: 2296029 (1942-09-01), Hagstrom
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