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:
Apr. 16, 2002
Filed:
May. 22, 2000
Wesley E. Renfro, Burton, OH (US);
Accuspray, Inc., Cleveland, OH (US);
Abstract
A combination of a pump and a control circuit for the pump includes a variable displacement pump having a swashplate, an input line and an output line. A pressure compensator valve is in fluid communication with the output line of the variable displacement pump. A first piston has a first end operatively connected to the swashplate wherein the first piston selectively exerts a first force on the swashplate. A second piston selectively exerts a second force on the swashplate wherein the second force is in the same direction as the first force. A first biasing element is operatively associated with the second piston. The first biasing element exerts a third force on the second piston, the third force being in opposition to the second force. Preferably, a second biasing element is provided which exerts a fourth force on the swashplate wherein the fourth force is in opposition to the first force. Preferably, the first and second pistons are collinear and the first biasing element is a spring which is mounted on the second piston. The second biasing element can be a spring which is positioned on an opposite side of the swashplate from the first piston. Preferably all of the mentioned elements are located in a common housing.