The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 14, 1981
Filed:
Oct. 06, 1978
Applicant:
Inventor:
Kenneth M Johnson, Atlanta, GA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05G / ;
U.S. Cl.
CPC ...
745942 ; 74437 ; 74393 ;
Abstract
A pedal powered gear transmission mechanism applicable to velocipedes, exercise machines or winches is disclosed. A system of non-circular gears or a combination of non-circular and circular gears between pedal cranks and a chain driving sprocket causes the pedal cranks to retard and advance cyclically relative to the chain sprocket by varying the instantaneous gear ratio between the pedal cranks and chain sprocket. The resulting change in mechanical advantage partially compensates for the inherent disadvantage at and near dead center pedal positions. A more uniform application of torque is developed.