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. 09, 2000
Filed:
Sep. 21, 1998
Robert B Kingsley, Yakima, WA (US);
Dowty Aerospace Yakima, Yakima, WA (US);
Abstract
DC motor-driven valve apparatus, comprising, in combination a valve unit having fluid input and output porting, the valve unit having a valve shaft rotatable between primary and secondary positions corresponding to different flow states; a reversible DC motor having a rotatable output shaft, gearing connected in the drive path between the motor output shaft and valve shaft, such that the ratio of motor shaft rotation to valve shaft rotation is in excess of 100; and circuitry including a potentiometer operatively connected to the valve shaft and to the motor to provide an output signal which varies with degree of valve shaft rotation for reversibly controlling the motor to terminate motor shaft rotation when the valve shaft alternately reaches the primary and secondary positions.