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. 17, 1986
Filed:
Sep. 10, 1984
Applicant:
Inventor:
Gerald R Parsons, Poplar Grove, IL (US);
Assignee:
Barber-Colman Company, Rockford, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F03G / ;
U.S. Cl.
CPC ...
185 / ; 25112911 ;
Abstract
The output shaft of a rotary actuator is rotated in one direction by an electric motor and is returned in the opposite direction by a spring which is wound during driving of the shaft by the motor. The motor drives the output shaft and winds the return spring by way of a speed-reducing, torque amplifying gear train. To enable the use of a lighter return spring and the use of a gear train effecting greater torque amplification from the motor to the output shaft, intermediate gears in the drive train apply winding torque to the return spring differentially of the drive torque applied to the output shaft.