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. 07, 1991
Filed:
Nov. 27, 1989
Applicant:
Inventor:
Walter J Aston, Dudley, GB;
Assignee:
Yale Security Products Ltd., Willenhall, GB;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E05B / ; G05G / ; F16D / ; H01F / ;
U.S. Cl.
CPC ...
335228 ; 335173 ; 70283 ; 74527 ; 192 / ;
Abstract
An electromagnetically activated mechanism has mechanical input and output members, at least one of which cooperates with the armature of an electromagnet which is energisable to prevent or limit movement of that member. The electromagnet and its armature are located so that when the electromagnet is de-energized the armature can be urged by the aforesaid one member towards a position in which the magnetic gap between the armature and the electromagnet is a minimum.