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:
Aug. 11, 2009
Filed:
Jun. 28, 2007
Georg Braml, Landsberg, DE;
Frank Fritsch, Kaufering, DE;
Helmut Burger, Moorenweis, DE;
Oliver Ohlendorf, Landsberg, DE;
Georg Braml, Landsberg, DE;
Frank Fritsch, Kaufering, DE;
Helmut Burger, Moorenweis, DE;
Oliver Ohlendorf, Landsberg, DE;
Hilti Aktiengellschaft, Schaan, LI;
Abstract
A universal motor () includes at least two carbon brushes () contacting the commutator (), a ventilation device () for producing a cooling flow (K), and a dust protection arrangement for preventing penetration of material particles (M) into the commutation region () and including at least one guide member () that provides for delivering of the material particles (M) in the cooling flow (K), with the at least one guide member () having a smooth concave guide surface () located between the two carbon brushes () and extending adjacent to an outer surface () of the commutator () and toward a suction opening () connected with the cooling flow path ().