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:
Nov. 02, 2004
Filed:
Jun. 07, 2001
Nicholas Robert Hirsch, Pewaukee, WI (US);
Mark Donald Schaefer, Waukesha, WI (US);
Michael Paul Braun, Wauwatosa, WI (US);
Peter Hotz, Whitefish Bay, WI (US);
Darrell Albert Wiatrowski, Beach Park, IL (US);
Ronald Lee Bartelt, Muskego, WI (US);
Brian Hubbard, East Troy, WI (US);
Briggs & Stratton Corporation, Wauwatosa, WI (US);
Abstract
A four-stroke internal combustion engine is provided that is capable of use in many power tools, including those power tools subjected to tippable applications. There is provided within an engine housing an oil reservoir and a valve chamber which independently communicate with a crank chamber. A strategically placed divider and passageway, located within the engine housing, appropriately direct lubricant within the engine housing so that the internal cavity of the engine is lubricated during use in various operating attitudes, and so that the fluid flows to and is held in the proper chambers of the engine housing during storage. There is also provided a breather arrangement for an internal combustion engine which includes a cam shaft having a hollow passageway in communication with the crank chamber and the air intake system of the engine.