Dual key locks with multi-function tumblers

Details Dual key locks with multi-function tumblers Dual key locks with multi-function tumblers

1979-06-04

1982-06-01

Wolfe, Robert L.

Locks

Operating mechanism

Key

70355, 70385, E05B 3512

Patent

active

043321534

ABSTRACT:
The invention provides an improved lock configuration by which a dual key lock can operate efficiently and conveniently with a single stack of tumblers. That configuration permits more accurate positioning of the tumblers upon key operation, whereby a larger number of key combinations can generally be accommodated. Also, the individual tumblers of the invention are typically receivable in the lock in a plurality of alternative orientations in which their gates assume different functions. That difference of function may constitute a change of effective gate position with respect to the same key, or may shift cooperation with the two keys from one pair of gates to another. That aspect of the invention is useful in facilitating key changes, especially in locks designed for safe deposit and similar service.

REFERENCES:
patent: 1148282 (1915-07-01), Benham
patent: 3127759 (1964-04-01), Ellis
patent: 4072032 (1978-02-01), Phillips

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