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. 11, 2003
Filed:
May. 31, 2002
Klaus Geyer, Sulzbach, DE;
Andreas Stihl AG & Co., Waiblingen, DE;
Abstract
A two-stroke engine in a hand-held working tool such as a motor chainsaw has a combustion chamber delimited by a piston which drives a crankshaft. An outlet for removing exhaust gases from the combustion chamber and an intake for supplying fresh mixture to the combustion chamber are provided. A storage duct opens into the intake and the crankcase and is connected with a carburetor. Combustion air flows via a crankcase intake and a transfer passage into the combustion chamber. For providing good power development with good exhaust emission values under all operating conditions, the flow cross-section of the mixture-forming channel leading to the storage duct is smaller by more than one half than the flow cross-section of the intake passage leading to the crankcase intake. During idle, the fuel required for operation is supplied substantially exclusively via the mixture-forming channel leading to the storage duct.