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:
Mar. 20, 1979
Filed:
Aug. 08, 1977
Applicant:
Inventor:
Alec H Seilly, North Wembley, GB;
Assignee:
Simms Group Research & Development Limited, Birmingham, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
310 27 ; 310 80 ; 335220 ;
Abstract
An electro-magnetic device comprises a first annular member and a second member having a cylindrical surface, the two members being interengaged. The presented surfaces of the two members are each provided with a two start or a multiple of a two start, thread formation thereby defining helical ribs on the two members. A winding is wound on the second member the winding arrangement being such that in the grooves or adjacent grooves the direction of current flow will be in the opposite direction when the winding is energized whereby the two members will move relative to each other to align the ribs on the members.