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:
Sep. 15, 1981
Filed:
Mar. 19, 1979
Applicant:
Inventor:
Donald L Hore, Bristol, GB;
Assignee:
Rotork Limited, Bath, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05G / ; F03G / ;
U.S. Cl.
CPC ...
74-2 ; 185 39 ; 251 69 ;
Abstract
An actuator has a fail-safe mechanism operable by a spring. The spring is normally held inoperable by electrical means so that the fail-safe mechanism is independent of the normal operation of the actuator. The fail-safe mechanism is rendered operative by failure of the electrical supply so that the spring rotates a cam plate which is coupled with the switch plate so as to move the output shaft to a predetermined fail-safe position by the stored energy of the spring force.