Front chain gear for a bicycle
AssigneeShimano Industrial Company Limited
InventorMasashi Nagano
Life of this patent
Estimating the term…
Abstract
A front chain gear for a bicycle, which is approximately elliptic in shape and of different pitch diameters. Teeth at the largest pitch diameter portion of the chain gear are made smaller in height than those at the smallest pitch diameter portion. Thus, the chain gear has a nearly exact addendum circle.
Claims3
A front chain gear for a bicycle, comprising a combination of at least one larger diameter chain gear with at least one smaller diameter chain gear, both said chain gears being different in tooth number from each other, at least said larger diameter chain gear being non-round in shape to provide a largest pitch diameter portion and a smallest pitch diameter portion, teeth at said largest pitch diameter portion being smaller in height than teeth at said smallest pitch diameter portion, whereby an addendum circle of said chain gear is of nearly exact circularity.
Dependencies are inferred from the claim text.