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US 4,512,166 AGranted
Cylinder lock and key
AssigneeOgden Industries Pty. Ltd.
InventorsGerald F. Dunphy, Donald J. Newman
Life of this patent
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AssigneeOgden Industries Pty. Ltd.
InventorsGerald F. Dunphy, Donald J. Newman
Estimating the term…
A lock of the cylinder type having a plurality of discs forming part of the barrel assembly and being rotatable relative to one another and to the body of the barrel assembly. The rotational axis of each disc is substantially coincident with the rotational axis of the complete barrel assembly and each disc has a keyway forming opening which contains that axis. Locking means such as a side locking bar is operative to hold the barrel assembly against rotation relative to the lock cylinder, but that locking means is responsive to the rotational positioning of the discs to release the barrel assembly for rotation when the discs have a particular rotational position relative to one another. The barrel assembly can be rotated in either direction away from the normally locked condition. A key for use with such a lock has an elongate blade which is of non-circular cross section and is twisted to create a plurality of relatively angularly disposed locating portions which are spaced apart longitudinally of the blade. Each locating portion is adapted to cooperate with a respective disc to hold that disc in the aforementioned particular rotational position. The hand of twist is reversed at least once along the blade length and sloping camming surfaces on the blade promote radial movement of the discs as the blade is moved through the lock keyway.
A key operated cylinder lock including a housing having a cylindrical bore therein, a barrel assembly rotatably mounted within said bore, a plurality of individual discs forming part of said barrel assembly and being arranged for relative rotation about a common axis, a key receiving opening of non-circular shape formed through each said disc at a location such that said common axis passes therethrough, locking means operative to prevent rotation of said barrel assembly relative to said housing and being responsive to the rotational positioning of the discs so as to be rendered inoperative when each said disc has a particular rotational position relative to the adjacent said disc, and at least one camming face is provided at a front side of each said disc at each of two opposite sides of said common axis, said camming faces being arranged for coaction with a key inserted into said lock and each being located directly adjacent the respective disc opening and sloping rearwardly of the said disc towards that opening so that said coaction induces the respective said disc to rotate towards a position at which said key can be moved longitudinally through the opening thereof.
A key operated cylinder lock including a housing having a cylindrical bore therein, a barrel assembly rotatably mounted within said bore, a plurality of individual discs forming part of said barrel assembly and being arranged for relative rotation about a common axis, a key receiving opening of non-circular shape formed through each said disc at a location such that said common axis passes therethrough, locking means operative to prevent rotation of said barrel assembly relative to said housing and being responsive to the rotational positioning of the discs so as to be rendered inoperative when each said disc has a particular rotational position relative to the adjacent said disc, and at least one camming face is provided at a front side of each said disc, said camming faces being arranged for coaction with a key inserted into said lock and each being located directly adjacent the respective disc opening and sloping rearwardly of the said disc towards that opening so that said coaction induces the respective said disc to rotate towards a position at which said key can be moved longitudinally through the opening thereof, at least one said camming face being provided at the rear side of each said disc and being arranged to slope in the opposite direction to the front side camming face, the rear side camming face being adapted to coact with said key as it is moved longitudinally out of said lock so as to induce rotation of the respective said disc.
A key operated cylinder lock including a housing having a cylindrical bore therein, a barrel assembly rotatably mounted within said bore, a plurality of individual discs forming part of said barrel assembly and being arranged for relative rotation about a common axis, a key receiving opening of non-circular shape formed through each said disc at a location such that said common axis passes therethrough, locking means operative to prevent rotation of said barrel assembly relative to said housing and being responsive to the rotational positioning of the discs so as to be rendered inoperative when each said disc has a particular rotational position relative to the adjacent said disc, said locking means comprising a plunger mounted in said housing for movement towards and away from said barrel assembly, spring means urging said plunger towards said barrel assembly, and a locking recess within said barrel assembly which receives an end portion of said plunger when said locking means is in its operative condition.
A key operated cylinder lock including a housing having a cylindrical bore therein, a barrel assembly rotatably mounted within said bore, a plurality of individual discs forming part of said barrel assembly and being arranged for relative rotation about a common axis, a key receiving opening of non-circular shape formed through each said disc at a location such that said common axis passes therethrough, locking means operative to prevent rotation of said barrel assembly relative to said housing and being responsive to the rotational positioning of the discs so as to be rendered inoperative when each said disc has a particular rotational position relative to the adjacent said disc, releasable means being provided to hold said barrel assembly against axial separation from said housing while permitting said relative rotation thereof, and said releasable means being responsive to insertion of a special key into said lock to release said barrel assembly for axial separation from said housing.
A key usable with a cylinder lock having a plurality of rotatable locking elements and including, an elongate blade adapted for insertion into a keyway of said lock, a plurality of locating portions provided along said blade and being spaced apart in the longitudinal direction thereof, the cross-sectional shape of said blade at each said locating portion being non-circular and having a major axis which extends transverse to and substantially intersects the longitudinal axis of said blade, each said major axis being angularly displaced about said longitudinal axis relative to at least one other said major axis, at least one indexing surface at each said locating portion which determines the rotational position of a said locking element engaged thereby when said blade is fully inserted into said keyway, and at least one camming surface extending between adjacent said locating portions and being arranged to cause partial rotation of an engaged said locking element as said blade is moved longitudinally through said keyway.
Dependencies are inferred from the claim text.