E - Fixed Constructions – 05 – B
Patent
E - Fixed Constructions
05
B
70/37
E05B 11/00 (2006.01)
Patent
CA 1046787
Abstract A key retaining cylinder lock device has a cylin- der body with a bore therein extending along an axis. A plug is rotatable in said bore about the axis and is con- fined 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 in- ner 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 laying on both sides of the keyway and sub- stantially 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 key- way in the path of the notch inner wall during withdrawal of the key from the keyway. The plug has a rotary lost mo- tion 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. -1-
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