Accuspray, Inc.

Wesley E Renfro

Charles T Scholl

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.

Pump with hydraulic load sensor and controller

A reciprocating hydraulic motor and pump assembly includes a cylinder and a piston disposed for reciprocation in the cylinder. The piston includes a stem having a bore extending longitudinally in the stem and a piston head connected to one end of the stem. The piston head includes a cavity communicating with the bore. A spool is slidably mounted in the stem bore and the piston head cavity. A magnetic latching assembly is disposed in the piston head cavity. A displacement rod is fastened to the piston rod. The hydraulic motor and pump assembly is used in an airless paint sprayer system.

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Burton, OH, United States of America

Wesley E Renfro