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:
Aug. 03, 2010
Filed:
Oct. 16, 2006
Joseph Edward Tabor, Eureka, IL (US);
Joseph Edward Tabor, Eureka, IL (US);
Caterpillar Inc, Peoria, IL (US);
Abstract
A cartridge valve assembly includes a body having a central bore, a first port, a second port, and a third port fluidly connected to the central bore. The cartridge valve assembly further includes a main spool positioned within the central bore and being movable between at least a first position and a second position. The main spool forms, within the central bore, a first chamber, and a second chamber, and a control chamber. The cartridge valve assembly also includes a first passage fluidly communicating the first chamber with the second chamber, and an actuator adapted to apply a force to a first end of the main spool. The cartridge valve assembly further includes a feedback spool having an end exposed to a feedback chamber formed within the body, and a second passage fluidly communicating the control chamber with the feedback chamber.