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:
Dec. 19, 1989
Filed:
Sep. 09, 1988
Applicant:
Inventors:
Herbert A Bankstahl, Fond du Lac, WI (US);
Neil A Newman, Omro, WI (US);
Assignee:
Brunswick Corporation, Skokie, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B63H / ;
U.S. Cl.
CPC ...
440 57 ; 440 75 ;
Abstract
A chain drive marine propulsion system employs dual counterrotating propellers. The propellers are mounted to concentric propeller shafts disposed in the lower end of a depending gearcase. The concentric propeller shafts are each provided with a lower sprocket engaging a chain. A counterrotation mechanism is provided for driving the chains in opposite directions, thereby resulting in counterrotation of the propellers. Various embodiments for driving the chains in opposite directions are disclosed.