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:
Sep. 20, 2005
Filed:
May. 29, 2003
Stephen R. Lewis, Minonk, IL (US);
Dana R. Coldren, Fairbury, IL (US);
Harish K. Krishnaswamy, Normal, IL (US);
Sudhindra K. Ayanji, Peoria, IL (US);
Jeremy T. Claus, Pontiac, IL (US);
Stephen R. Lewis, Minonk, IL (US);
Dana R. Coldren, Fairbury, IL (US);
Harish K. Krishnaswamy, Normal, IL (US);
Sudhindra K. Ayanji, Peoria, IL (US);
Jeremy T. Claus, Pontiac, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
An electromagnetic control valve is provided. The control valve includes a housing defining a bore and a fluid passageway having a seat. A valve element is slidably disposed in the bore and is moveable between a first position where a flow of fluid passes by the seat and a second position where a flow of fluid relative to the seat is blocked. A solenoid having an armature is operatively connected with the valve element. The solenoid is operable to move the valve element from the first position to the second position. A biasing assembly is operatively engaged with the valve element and is adapted to move the valve element from the second position towards the first position. The biasing assembly exerts a first force on the valve element during a first predetermined travel distance from the second position and a second force on the valve element during a second predetermined travel distance. The first force is greater than the second force.