Patent ID: 7647798

Claim:
A lock including: a barrel; a core rotatably disposed within the barrel and having an axial keyway formed therein; a plurality of tumbler bores axially disposed along only a single row in the core and communicating with the keyway, each tumbler bore having a uniform non-circular cross section; a plurality of tumbler pins, each tumbler pin disposed in one of the tumbler bores and biased inwardly towards the keyway, each tumbler pin having a uniform cross section substantially matching that of the tumbler bores so as to allow each tumbler pin to move axially but not radially within the bore in which that tumbler pin is disposed; a plurality of sidepin bores, each sidepin bore formed along an axis that intersects only a single different tumbler pin bore at a selected angle, the selected angle for each sidepin bore being different from the selected angle of other sidepin bores; for each different selected angle, a mating longitudinal channel formed in the barrel, each sidepin bore aligning with one of the mating longitudinal channels in the barrel when the core is disposed at a locked rotational position within the barrel; an independently movable side pin disposed in each side-pin bore and biased towards one of the longitudinal sidepin channels in the barrel, a first end of each side pin resting against a tumbler pin and a second end of each side pin extending into the mating channel in the barrel when the core is disposed at a locked rotational position within the barrel; wherein each tumbler pin includes a non-circumferential side hole disposed at a position along its length, said position radially aligned with the axis of the side pin bore intersecting the tumbler pin bore in which the tumbler pin is disposed, each side hole aligning with the side-pin bore when a proper key is inserted to allow the sidepin to move inwardly through the sidepin bore in which the sidepin is disposed into the side hole; and wherein the spacing between tumbler pin bores is non-uniform.