Maximum-security lock

Details Maximum-security lock Maximum-security lock

1975-08-29

1976-12-28

Wolfe, Robert L.

Locks

Operating mechanism

Key

70354, E05B 910, E05B 1704

Patent

active

039994147

ABSTRACT:
A lock assembly has a housing in which is provided a cylinder lock having a shell fixed in the housing and a plug rotatable in the shell by means of a key. A tongue is carried on and jointly rotatable with the plug and is formed with a plurality of bittings each engageable with a respective tumbler in the housing and displaceable into an aligned position. A locking element such as a bolt is engageable with the tumblers and is only displaceable between a locked and unlocked position when the tumblers are in the aligned position. The tongue is formed of a plurality of plates each constituting a respective one of the bittings. Thus even if the cylinder lock is forcibly ripped out of the assembly a tumbler-type lock structure is left within that cannot readily be overcome to allow operation of the locking element.

REFERENCES:
patent: 1549603 (1925-08-01), Murmann
patent: 3385086 (1968-05-01), Patriquin
patent: 3911761 (1975-10-01), Cornellier

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