Adapter chainring
OwnerKirby A. Palminventor
Life of this patent
Estimating the term…
Abstract
The invention is an adapter chainring for a multiple speed bicycle comprising a derailleur and a crankset having outer and inner chainrings. The adapter chainring has teeth disposed on its outer periphery for engaging the bicycle chain. The adapter chainring defines a plurality of holes which receive bolts to attach the adapter chainring to the crankset in place of the conventional inner chainring of a two chainring crankset, and to a third, smaller inner chainring which is added to the crankset to convert it to a three chainring crankset having additional, lower gears.
Claims8
An adapter chainring for converting a bicycle conventional two-chainring crankset, including outer and inner chainrings, to a three-chainring crankset including a third, inner chainring having an outer diameter smaller than the outer diameter of the conventional inner chainring, by replacing the conventional inner chainring with the adapter chainring and adding a third, inner chainring to the conventional crankset, said adapter chainring comprising:
- a ring-like plate having inner and outer faces and an outer periphery, a plurality of teeth on said outer periphery, a plurality of spaced outer holes in said plate for receiving bolts for attaching said adapter chainring to the conventional inner chainring, and a plurality of spaced inner holes in said plate for receiving bolts for attaching said adapter chainring to the third, inner chainring.
Dependencies are inferred from the claim text.