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. 18, 1979
Filed:
Dec. 27, 1977
Alfred A Frankenberg, Knoxville, TN (US);
Robertshaw Controls Company, Richmond, VA (US);
Abstract
A method of making a pneumatically operated actuator having a pneumatically operated movable wall interconnected by a feedback tension spring to a pilot valve positioner that is adapted to pneumatically operate the movable wall of the actuator in relation to a pneumatic signal directed to the positioner, the method including the steps of loosely projecting one end of the spring through an opening in the wall after the other end of the spring has been interconnected to the pilot valve positioner and pulling on the one end of the spring while directing a predetermined pneumatic signal to the positioner so that the wall will assume a position thereof relative to the one end of the spring and the actuator that corresponds to the predetermined pneumatic signal whereby the one end of the spring can be secured to the wall while the wall is in that position thereof and the spring is in the pulled condition thereof that caused the wall to move to such position.