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US 2004/0110590 A1Published application
Sprocket
AssigneeRenthal Limited
InventorAndrew Charles Renshaw
Life of this patent
Estimating the term…
Abstract
A toothed annulus of steel is attached to the perimeter of an aluminium disc by means of threaded engagement. At least the perimeter edge of the disc and the inner edge of the annulus will usually be of substantially the same thickness.
Claims8
A sprocket comprising a disc of a first metal material having a substantially circular perimeter and an externally toothed annulus of a second metal material which is attached around the perimeter of the disc by the inner edge of the annulus being threadedly engaged with the perimeter edge of the disc.
Dependencies are inferred from the claim text.