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:
Feb. 25, 2003
Filed:
Sep. 05, 2001
Jochen Kramer, Waiblingen, DE;
Lars Bergmann, Welzheim, DE;
Michael Raffenberg, Fellbach, DE;
Heiko Rosskamp, Adelberg, DE;
Andreas Stihl AG & Co., Waiblingen, DE;
Abstract
The invention relates to a two-stroke engine for a portable handheld work apparatus such as a motor-driven chain saw, cutoff machine, brushcutter or the like. A crankcase ( ) is formed below the engine cylinder ( ). A piston ( ) moves up and down in the cylinder ( ) and drives a crankshaft ( ) rotatably journalled in the crankcase ( ). A fuel-containing mixture is supplied via a membrane carburetor ( ) to the combustion chamber ( ) delimited between the piston ( ) and the cylinder ( ). A bypass channel ( ) is provided parallel thereto and supplies essentially fuel-free air to the combustion chamber ( ). The bypass channel ( ) opens into a channel segment ( ) via a connecting piece ( ) fixedly attached to the cylinder ( ). The channel segment ( ) is formed in the cylinder wall ( ). A spark plug ( ) and an ignition control device ( ) are assigned to the combustion chamber ( ). The ignition control device ( ) is fixedly mounted with a portion to the cylinder ( ) via one attachment point ( ) and is fixedly mounted to the connecting piece ( ) via another attachment point ( ).