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. 04, 1989
Filed:
May. 27, 1988
Applicant:
Inventors:
Richard J McKay, Wolverhampton, GB;
Philip Hudson, Wolverhampton, GB;
Assignee:
Lucas Industries Public Limited Company, Birmingham, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F15B / ;
U.S. Cl.
CPC ...
13762565 ; 13762563 ; 13762564 ;
Abstract
A first control element is movable to control fluid flow between ports in a housing. A second control element is movable by an electric force motor and engages the first element through biasing springs so that in normal use the elements move in unison. An arrangement of ports and passages in the elements has the effect that relative movement between the elements as a result of jamming of the first element causes fluid pressure to be applied to the first element to overcome the jamming.