Patent ID: 6209367
Filing Date: 2001-04-03
Classification: E05B,E05C,G07C,G07F,H01F,Y10T

Abstract:
A lock, comprising:a housing bearing a hole;a bolt supported by and travelling when a plane belayed a first position protruding beyond said housing and a second position retracted within said housing, said bolt being perforated by a guide aperture and a drive aperture;a cylinder plug perforated by a keyway having an axis transversely oriented relative to said plane, said cylinder plug having an exposed circuimferential surface surrounding said keyway, and a key retainer positioned within said cylinder plug to retain a shank of a key inserted within said cylinder plug;a cam positioned along said axis between said cylinder plug and said bolt, to rotate with said cylinder plus and force said bolt to travel between said first position and said second position as a key conformingly corresponding to said cylinder plug manually applies a rotational force to said cylinder plug through an arc centered upon said axis;a shear pin exhibiting a shear force, said shear pin extending between said cylinder plug and said cam, to transmit said rotational force between said cylinder plug and said cam until said rotational force exceeds said shear force:a spacer extending along said axis from said cam and into said guide aperture;a guide centered along said axis extending from said spacer, conforming to and received within said hole borne by said housing;a second pin spaced radially apart from said axis, extending from said cam and into said drive aperture;an electronic circuit containing a memory, said electronic circuit being mounted within said housing and borne by said cam to rotate with said cam through said arc, said electronic circuit operationally responding to digital data carried by the key conformingly corresponding to said lock; anda release mounted upon and borne by said cam, and operationally activated by said electronic circuit to move between a deployed position preventing rotation of said cam relative to said housing, and a released position accommodating said rotation of said cam relative to said housing.