Duplex lock

Locks – Operating mechanism – Key

Patent

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Details

70366, 70377, 70421, E05B 1514, E05B 2902, E05B 3512

Patent

active

044009550

ABSTRACT:
A duplex lock codable by a master key and releasable by a duplex key and comprising a first fixed hollow cylindrical body in which a second cylindrical body is rotatably mounted. An axially shiftable slider is firmly secured to the second cylindrical body for locking it relative to the first cylindrical body by insertion in a cavity provided at the bottom of the first cylindrical body. When the slider is withdrawn, the two cylindrical bodies are released. The slider is provided with a plurality of axially spaced recesses which by axial movement of the slider can be brought into alignment with a plurality of apertures in the rotatable cylindrical body. Each of the apertures accommodates a U-shaped rocker lever having a front U-shaped end facing the slider and a rear end attached to a helical spring tending to pull the rocker lever toward an abutment surface in the interior of the rotatable cylindrical body. When the master key is inserted in the rotatable cylindrical body, the legs formed by the U-shaped ends of the rocker levers are lifted and swung into the recesses in the slider and when the duplex key is inserted axially in the rotatable cylindrical body adjacent the master key, the legs of the rocker levers are lifted and swung by the same amount in the opposite direction, resulting in centering of the slider and permitting it to be withdrawn axially to open the lock.

REFERENCES:
patent: 2970466 (1961-02-01), Wellekens
patent: 3585826 (1971-06-01), Mercurio
patent: 3605463 (1971-09-01), Epstein
patent: 3908417 (1975-09-01), Beudat
patent: 4114410 (1978-09-01), Astier
patent: 4332153 (1982-06-01), Miles

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