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:
May. 29, 2007
Filed:
May. 06, 2005
Bernd Fruehwald, Erlbach, DE;
Martin Koechling, Nuremberg, DE;
Ruediger Spitzner, Berg, DE;
Juergen Strueber, Nuremberg, DE;
Bernd Fruehwald, Erlbach, DE;
Martin Koechling, Nuremberg, DE;
Ruediger Spitzner, Berg, DE;
Juergen Strueber, Nuremberg, DE;
Buehler Motor GmbH, Nuremberg, DE;
Abstract
The invention concerns a gear motor () with a fail-safe device () consisting of a housing (), an electromotor (), a reduction gear () with at least one planetary gear (), an electromagnetic clutch () and an output gear shaft (), wherein the planetary gear () has an internal gear. The internal gear is in mesh with at least one planetary wheel () and is fixed in its operation relative to the housing (). The planetary gear comprises the electromagnetic clutch (), a magnetically conductive armature and a magnetically conductive stator () in which an electromagnetic coil () is arranged. During the application of current to the electromagnetic coil () the internal gear () is secured against turning. The task of the invention is to provide for a reliable operation of the fail-safe device in a gear motor of such kind using less construction space and less number of components thus enabling simple assembly. This task is solved in accordance with the present invention by providing an internal gear () that acts as a magnet armature, is axially displaceable and whose geometric alignment is not determined by the housing () at least during a power-on and off condition of the electromagnetic clutch ().