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:
Dec. 22, 1998
Filed:
Jul. 24, 1996
Applicant:
Inventors:
Lawrence J Strojny, Oostburg, WI (US);
Gerald A Duenkel, Grafton, WI (US);
Assignee:
Johnson Service Company, Milwaukee, WI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
307 87 ; 318107 ; 318139 ; 49 28 ;
Abstract
An electric actuator return-to-normal failsafe system that utilizes a bank of storage capacitors to store electrical energy for returning an electrical actuator to a safe position in the event of a power failure. The failsafe system includes a regulator circuit that regulates the output of the storage capacitor such that a constant power output is applied to the electric actuator. The constant power output from the regulator circuit is also available to provide directional control of the actuator.