Numerical combination replacement plug for cylinder locks

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

1977-02-28

1977-12-27

Frazier, Roy D.

Locks

Operating mechanism

Combination

70311, E05B 3704

Patent

active

040647188

ABSTRACT:
A replacement plug adapted to substitute a key operated 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 disposed at right angles relative to the axis of rotation of an actuating knob, which is mounted on an axially shiftable shaft. Selection of the proper combination frees the shaft for axially outward movement whereby a lock opening means is connected to the, actuating knob for the transmission of rotating motion to a lock bolt or other locking structure.

REFERENCES:
patent: 74781 (1868-02-01), Wetzel
patent: 374712 (1887-12-01), Smith
patent: 1431316 (1922-10-01), McCabe
patent: 1816575 (1931-07-01), Full
patent: 1987925 (1935-11-01), Carlson
patent: 3099150 (1963-07-01), Check
patent: 3196643 (1965-07-01), Moss

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