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:
Feb. 19, 1991
Filed:
Aug. 07, 1989
Applicant:
Inventors:
Ivan E Wilkinson, Lynchburg, VA (US);
Charles L Hylton, Madison Heights, VA (US);
R Gregory Pence, Forest, VA (US);
Assignee:
Limitorque Corporation, Lynchburg, VA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16H / ; F16H / ; F16H / ;
U.S. Cl.
CPC ...
475-4 ; 74458 ; 25112903 ; 475-7 ;
Abstract
A valve actuator differential worm planetary gear drive provides forward or reverse motion to a valve stem, from an input from either a motor-driven worm or a handwheel drive worm, by using a plurality of planet gears to send motion to the sun gear. If the preference is to have the motor drive the valve primarily, the manual worm stays locked and the motor worm acts as a planetary arm. When it is desired to move the valve by hand, the motor gear is fixed and rotation of the handwheel worm gear transmits the power through the ring gear and the planet gears to the drive sleeve.