Locks – Operating mechanism – Key
Patent
1976-04-12
1977-06-14
Wolfe, Robert L.
Locks
Operating mechanism
Key
70372, E05B 1100
Patent
active
040289176
ABSTRACT:
A key retaining cylinder lock device has a cylinder body with a bore therein extending along an axis. A plug is rotatable in said bore about the axis and is confined against axial translation. The plug has an axially extending keyway therein open to said bore and adapted to receive a key having an edge notch partly defined by an inner wall extending at least partially transversely of said axis. The plug also has a circumferential groove open to the keyway and open to a chamber in part defined by a plug chordal surface lying on both sides of the keyway and substantially perpendicular to the plane of symmetry of the keyway. In the groove and chamber is a partial ring having a central, inwardly directed lug adapted to contact the plug chordal surface with rotary lost motion therebetween. The partial ring has end shoes in frictional braking contact with the wall of the bore and is movable between a first position out of the keyway and a second position in the keyway in the path of the notch inner wall during withdrawal of the key from the keyway. The plug has a rotary lost motion disc connected to a flat driver bar, the connector disc having an opening partly bounded by a disc chordal surface parallel to the plug chordal surface. The driver bar is connected to reciprocate a bolt.
REFERENCES:
patent: 3702550 (1972-11-01), Shimizu
Schlage Lock Company
Wolfe Robert L.
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