Locks – Operating mechanism – Key
Patent
1992-08-10
1993-07-06
Gall, Lloyd A.
Locks
Operating mechanism
Key
33540, 70395, 70398, 70408, 70495, E05B 1920
Patent
active
052243656
ABSTRACT:
A side bar lock decoder has a pair of guide plates laminarly arranged between a pair of side plates. Key portions of the plates have notches spaced for alignment with the lock wafers. Narrow passages between the guide plates extend from each of the notches to the edges of the base portions of the plates at approximately normal fingertip positions when the base portions are hand held. Wires slidably disposed in each of the passages extend from an outer end of each of the notches beyond the grip edges. One end of the wires abuts one of the wafers when the wafers and the notches are aligned. Springs, bias each of the wires toward a threshold reference position within the notches. Plungers, one connected to each of the wires, extend beyond the grip edges, are independently biased away from their respective edges by the springs. One or more housings secured to the laminar plates have at least one chamber therein for guiding the movement of each of the plungers during manipulation. Windows in the housings allow viewing of the depth of each plunger in its housing and at least one graduated scale on each housing, corresponding to the graduated scale of wafer depths of the lock, indicates the position of each plunger in relation to its threshold reference position when the wafers are shifted into the "open lock" condition. Pins extend from each plunger externally of its housing to facilitate simultaneous finger manipulation of each plunger.
REFERENCES:
patent: 2309677 (1943-02-01), Segal
patent: 2491288 (1949-12-01), Strangman
patent: 2733514 (1956-02-01), Pennington
patent: 3264908 (1966-08-01), Moore
patent: 4120184 (1978-10-01), Gerlach
patent: 4156375 (1979-05-01), Crasnianski
patent: 4185482 (1980-01-01), Nail
patent: 4517746 (1985-05-01), Easley
patent: 4535546 (1985-08-01), Smith
patent: 4638567 (1987-01-01), Leversee
patent: 4667494 (1987-05-01), Joosten
patent: 5172578 (1992-12-01), Bitzios
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