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:
Sep. 15, 2008
Filed:
Sep. 28, 2005
David B. Mohler, Tipp City, OH (US);
David B. Mohler, Tipp City, OH (US);
SAIA-Burgess Inc., Vandalia, OH (US);
Abstract
A rotary actuator () includes a rotor () which is disposed in a housing () between first and second pole pieces (and) of a stator (). The rotor () is rotatable relative to the stator () between an unactuated position (FIG.) and an actuated position (FIG.). During rotation of the rotor (), the axial extent of a first working air gap () between the rotor and a first pole piece () of the stator () remains constant. However, the axial extent of the working air gap () between the rotor () and the second pole piece () of the stator () decreases as the rotor moves from the unactuated position to the actuated position. In a preferred embodiment, the rotor lobes are made so that the net axial force of all of the rotor lobes is substantially zero thereby reducing stress on the rotor shaft support bearings.