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. 04, 1976
Filed:
Nov. 26, 1974
Applicant:
Inventors:
Alan Thomas, Stratford on Avon, EN;
Ronald Alfred Heath, Birmingham, EN;
Assignee:
Lucas Aerospace Limited, Birmingham, EN;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F / ;
U.S. Cl.
CPC ...
335217 ; 336 30 ;
Abstract
An electromagnetic force applying device comprises a core with an annular air gap, a coil for creating a radial magnetic field in the air gap and an armature ring movable axially in the air gap. The core and the ring are of different magnetic materials with different coefficients of thermal expansion so that the force applied to the ring when a given current flows through the coil varies with temperature.