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. 28, 2015
Filed:
Apr. 27, 2012
Jan Kurzenberger, Köngen, DE;
Thorsten Hecht, Dürbheim, DE;
Sebastian Hänssler, Stuttgart, DE;
Stefan Kummermehr, Berglen, DE;
Jan Kurzenberger, Köngen, DE;
Thorsten Hecht, Dürbheim, DE;
Sebastian Hänssler, Stuttgart, DE;
Stefan Kummermehr, Berglen, DE;
Andreas Stihl AG & Co. KG, Waiblingen, DE;
Abstract
In an internal combustion engine () of a portable handheld work apparatus, the cylinder () is provided with cooling ribs (). A cooling airflow is generated by the fan wheel () and is guided over the cooling ribs. A carburetor () is temperaturized as required by the heated cooling air. A control of the cooling airflow to the carburetor () takes place in that an opening (), which passes the heated cooling air, is selectively closed or opened via a closure element (). In order to obtain improved cooling of the cylinder during summer operation as well as during winter operation, the closure element () is provided with at least one air guide wall which extends essentially transversely to the cooling airflow and causes this cooling air to be partially backed up and deflected.