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:
May. 16, 2000
Filed:
May. 09, 1997
Georg Becker, Schwaikheim, DE;
Hans-Georg Wiedmann, Backnang, DE;
Dieter Angstenberger, Leutenbach, DE;
Andreas Stihl AG & Co., Waiblingen, DE;
Abstract
A hand-guided working tool has a housing and an internal combustion engine arranged in the housing. The internal combustion engine has a cylinder, a crankshaft, and a crankcase enclosing the crankshaft. An air filter box including an air filter element is connected to the internal combustion engine. A tool is driven by the crankshaft. The housing has a blower chamber with a cooling air inlet, at least one combustion air inlet, and a combustion air outlet. A combustion air channel connects the combustion air outlet to the air filter box. A blower, driven by the crank shaft and arranged in the blower chamber, is provided for taking in cooling air through the cooling air inlet and supplying the cooling air to the internal combustion engine and for taking in combustion air through the at least one combustion air inlet and guiding the combustion air through the combustion air outlet, the combustion air channel, and the air filter box to the internal combustion engine. The blower includes a first blower wheel for conveying cooling air and a second blower wheel for conveying combustion air.