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:
Jul. 09, 1991
Filed:
Oct. 30, 1989
Douglas A Hodgson, Cary, NC (US);
Theodore G Duclos, Cary, NC (US);
Lord Corporation, Erie, PA (US);
Abstract
A vibration isolator including an electrorheological fluid filled partition assembly for providing variable dynamic stiffness characteristics. The partition assembly separates the variable volume fluid chambers of the isolator and includes movable electrode elements which define therebetween a chamber containing an electrorheological fluid. A fixed electrode is positioned between the movable electrode elements and separates the chamber into upper and lower portions. A plurality of openings extend through the fixed electrode allowing for passage of the electrorheological fluid between the portions in response to movement of the movable electrode elements. The yield stress developed in the electrorheological fluid by application of an electric field constrains movement of the movable electrode elements in response to input excitations thereby providing the isolator with a selectable dynamic stiffness.