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:
Jan. 23, 2018
Filed:
Dec. 15, 2014
Andreas Stihl Ag & Co. KG, Waiblingen, DE;
Ernst Gorenflo, Bad Rappenau, DE;
Klaus-Martin Uhl, Plochingen, DE;
Georg Maier, Kernen im Remstal, DE;
Andreas Stihl AG & Co. KG, Waiblingen, DE;
Abstract
A handheld work apparatus has a combustion engine which drives a tool of the work apparatus via a centrifugal clutch. The centrifugal clutch couples in an engagement rotational speed range (n) which extends between a lower engagement rotational speed (n) and an upper engagement rotational speed (n). The engine has a fuel supply device, an ignition device, a control device and a device for detecting the rotational speed (n) of the engine. A method for operating the handheld work apparatus makes provision for the rotational speed profile of the combustion engine to be monitored in the engagement rotational speed range (n) and for the power (P) output for driving the tool to be increased from an operating power (P) to an increased power (P, P) when the rotational speed profile corresponds with a predetermined rotational speed profile over a predetermined period of time (Δt).