Cylinder lock with anti-picking device

Details Cylinder lock with anti-picking device Cylinder lock with anti-picking device

1985-09-16

1986-10-28

Smith, Gary L.

Locks

Operating mechanism

Key

70423, 70455, E05B 1714, E05B 1506

Patent

active

046191240

ABSTRACT:
This disclosure relates a cylinder lock with anti-picking device. A shaft is provided to extend into the keyway of the lock to prevent the entry of any foreign object. Only when a special tool is used to retract the shaft can a key be inserted into the keyhole, thereby eliminating the risk of picking by unauthorized persons.

REFERENCES:
patent: 348715 (1886-09-01), Bedford
patent: 453082 (1891-05-01), Hollyday
patent: 650556 (1900-05-01), Fischer
patent: 734541 (1903-07-01), Green et al.
patent: 761568 (1904-05-01), Wedler
patent: 1486037 (1924-03-01), Rousseau
patent: 2462954 (1949-03-01), Frizzell
patent: 3820364 (1974-06-01), Greeley
patent: 3857264 (1974-12-01), Fowler
patent: 4031730 (1977-06-01), Kern
patent: 4277962 (1981-07-01), Lipschutz

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