Title: Bicycle drive sprocket system

Abstract: The invention relates to an improved pedal drive mechanism for a bicycle. The mechanism provides a vertically oval pedal path which provides an improvement in the thrust imparted to the driving wheel during the downward movement of the pedal. These paths are defined by two sets of sprockets disposed in parallel planes connected by a set of double strand chains. This mechanism is connected to the drive wheel by a conventional sprocket-chain linkage.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Sawmiller, Nile E. (Lima, OH, US)
Sawmiller, Craig S. (Lima, OH, US)

Application Number: 851827
Filing Date: 1977-11-16
Publication_date: 1979-11-06
Assignee:
Primary Class(es): 474/88 74/594.2, 280/252, 280/261, 474/84, 474/160
Other Classes:
US Patent Ref:

641980	Jan, 1900	Lower	280/261.
1154292	Sep, 1915	Cribbs	280/261.
1205382	Nov, 1916	Parda	280/261.
1485682	Mar, 1924	Liese	280/261.
1535714	Apr, 1925	Burke	280/261.
3820820	Jun, 1974	Kutz	280/252.
3891235	Jun, 1975	Shelly	280/241.
3972244	Aug, 1976	Bieser et al.	74/217.
4029334	Jun, 1977	Tramme, Jr.	280/261.

Other Refs:
Primary Examiner: Capossela, Ronald C.
Assistant Examiner:
Attorney: