Augmented key and cylinder lock

Details Augmented key and cylinder lock Augmented key and cylinder lock

1977-03-07

1978-09-19

Wolfe, Robert L.

Locks

Operating mechanism

Key

70375, 70408, E05B 904, E05B 1904

Patent

active

041144112

ABSTRACT:
An augmented key and cylinder lock has a housing with a bore therein concentric about an axis. A plug in the bore is rotatable about the axis and has a flange on one end. There is a radial pin tumbler mechanism in the plug and housing access to which is afforded by a keyway in the plug which extends through the flange leaving a notch therein. A key serrated along one edge to operate the pin tumbler mechanism is receivable in the keyway to occupy an operating position. In that position, a shoulder adjacent the serrated edge of the key substantially abuts the end face of the flange. In that position another, axially elongated shoulder on the key adjacent its other edge axially displaces a spring pressed detent, supported on the housing, out of the notch. This frees the plug from rotational restraint by the detent.

REFERENCES:
patent: 1958603 (1934-05-01), Bacon
patent: 3216230 (1965-11-01), Falk
patent: 3425248 (1969-02-01), Duval
patent: 3774423 (1973-11-01), Orr
patent: 3861181 (1975-01-01), Needham

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