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:
Apr. 23, 2013
Filed:
Nov. 08, 2010
Heinrich Leufen, Schwaikheim, DE;
Franz Mandl, Fellbach, DE;
Eberhard Schieber, Backnang, DE;
Georg Maier, Kernen, DE;
Heinrich Leufen, Schwaikheim, DE;
Franz Mandl, Fellbach, DE;
Eberhard Schieber, Backnang, DE;
Georg Maier, Kernen, DE;
Andreas Stihl AG & Co. KG, Waiblingen, DE;
Abstract
The invention relates to a portable hand-guided work apparatus having an internal combustion engine () for driving a work tool (). A combustion chamber () is formed in a cylinder () of the engine () and is delimited by a piston () which drives a crankshaft () in rotation. A spark plug () is held in the cylinder () and is driven by an ignition module () to ignite a compressed air/fuel mixture in the combustion chamber () to drive the piston (). A short circuit line () is provided on the ignition module () for switching off the ignition. The short circuit line () is configured as a bus line () in order to make available, in a simple manner, a plurality of further operating parameters to the ignition module. An external control apparatus () and/or sensors () are connected to the bus line (). The ignition module (), as master, controls data traffic on the bus line () and permits a data communication on the bus line () only when a minimum crankshaft angular distance (A, B) is present at an ignition time point (Z, Z) of the ignition module ().