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:
Dec. 30, 2008
Filed:
Nov. 30, 2004
Scott F. Shafer, Morton, IL (US);
Brad E. Bartley, Manito, IL (US);
Kevin Charles Reynolds, Maidstone, GB;
Gregory W. Hefler, Chillicothe, IL (US);
Scott F. Shafer, Morton, IL (US);
Brad E. Bartley, Manito, IL (US);
Kevin Charles Reynolds, Maidstone, GB;
Gregory W. Hefler, Chillicothe, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
A pump has a housing defining a first pumping chamber and a second pumping chamber. The pump also has a first plunger and a second plunger. The pump additionally has at least one driver operatively engaged with at least one of the first and second plungers to move the at least one of the first and second plungers between first and second end positions. The pump further has a common spill passageway fluidly connectable to the first and second pumping chambers and a selector valve disposed between the common spill passageway and the first and second pumping chambers. The selector valve has a body and a ball valve member operably disposed within the body. The ball valve member is movable between a first and a second ball valve member position to selectively fluidly connect the first and second pumping chambers to the common spill passageway.