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:
Jun. 16, 2009
Filed:
Feb. 24, 2006
Matthis Nickel-jetter, Villingen-Schwennigen, DE;
Hermann Rappenecker, Vöhrenbach, DE;
Siegfried Schreiner, Villingen-Schwenningen, DE;
Matthis Nickel-Jetter, Villingen-Schwennigen, DE;
Hermann Rappenecker, Vöhrenbach, DE;
Siegfried Schreiner, Villingen-Schwenningen, DE;
EMB-PAPST St.Georgen GmbH & Co. KG, St. Georgen, DE;
Abstract
An improved drum motor, preferably electronically commutated, features a unitary stationary central shaft () supporting a stationary inner stator (), and an external rotor (), including permanent magnets (), secured to an inner surface of a generally cylindrical rotatable casing part (). This permits variable speed operation while avoiding any need for an internal gear linkage. Safety is improved by making sealing plates () at respective axial ends of the casing () stationary, and providing an annular peripheral seal () around each sealing plate. Respective rolling bearings () near each end of the casing () facilitate rotation of the external rotor () relative to the stator (), and a clamping arrangement () minimizes noise from the bearings.