Tamper-resistant lock and key assembly

Locks – Operating mechanism – Key

Patent

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Details

70407, E05B 1714

Patent

active

040941779

ABSTRACT:
An improved, tamper-resistant lock and key assembly is provided of the type which includes a key having a post and a generally cup-shaped bit having a bitting formed on the outer end thereof, a generally hollow cylinder, and a circular, pin-type tumbler mechanism housed within the cylinder and defining therewith an annular keyway. The key may be inserted a fixed distance into the keyway to permit rotation thereof between a release and locking position. The improved assembly provides a key having a key bit which has a notched portion formed therein radially inwardly of the bitting thereof and means for obstructing direct access of the key bit to the keyway. The obstruction means includes an obstruction member spaced above and generally overlying the keyway, which necessitates lateral shifting of the key bit therebelow to effect alignment thereof with the keyway. The obstruction member also includes an abutment shoulder spaced above and overlying a portion of the keyway, which is configured and dimensioned to mate with the notched portion of the key bit to permit alignment of the bitting of said bit with the keyway.

REFERENCES:
patent: 3334501 (1967-08-01), Greenwald
patent: 3444712 (1969-05-01), Greenwald
patent: 3465556 (1969-09-01), McIlvenny

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