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. 15, 1979
Filed:
Feb. 17, 1976
Applicant:
Inventor:
Trevor S Smith, Sutton Coldfield, GB;
Assignee:
Lucas Aerospace Limited, Birmingham, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16k / ;
U.S. Cl.
CPC ...
251133 ; 74661 ; 7466 / ; 7466 / ; 251248 ;
Abstract
A throttle valve has a control member which is angularly positioned by two stepper motors which drive the control member through differential gearing. The drives to the control member are arranged so that a single step displacement of the respective motors in the same direction drives the control member by different amounts in opposite directions, providing a high resolution drive. The control member may be driven at a high speed by reversing one of the motors.