Numerical combination replacement for cylinder locks

Details Numerical combination replacement for cylinder locks Numerical combination replacement for cylinder locks

1978-06-12

1979-10-16

Wolfe, Robert L.

Locks

Operating mechanism

Combination

70321, 70431, E05B 3708

Patent

active

041708865

ABSTRACT:
A replacement housing and plug adapted to substitute a key-operated housing, plug and tumblers in an existing tumbler lock without extensive modification of an existing installation in a door, thereby reducing the possibility of mechanical picking of the tumblers which are thereby eliminated. The combination tumblers are disposed for rotation about an axis corresponding to the axis of the substituted plug, and a resiliently urged locking bar is positioned above the tumblers to drop into tumbler engaging position when the proper combination has been obtained, thereby interconnecting a dial member with a lock opening means for transmitted motion from the former to the latter.

REFERENCES:
patent: 1022268 (1912-04-01), Schechter
patent: 3099150 (1963-07-01), Check
patent: 4064718 (1977-12-01), Cowen

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