Patent ID: 6484763
Filing Date: 2002-11-26
Classification: B05C,F04B

Abstract:
An apparatus for providing a volume of a fluid from a fluid source, comprising:a body including a piston cylinder with a first variable volume compartment and a second variable volume compartment having a fluid outlet; a piston assembly positioned within said piston cylinder and mounted for reciprocating movement within said piston cylinder, said piston assembly including a piston dividing said piston cylinder into said first and second variable volume compartments and a fluid passageway having a first port in fluid communication with said second variable volume compartment and a second port configured for fluid communication with the fluid source; a flow control device operative to selectively interrupt fluid flow in said fluid passageway from the fluid source to said second variable volume compartment, said flow control device having a closed position that interrupts fluid flow through said fluid passageway and an open position that permits fluid flow through said fluid passageway into said second variable volume compartment; and a rotatable drive element operatively coupled with said piston assembly such that rotation of said drive element reciprocates said piston in first and second opposed directions within said piston cylinder to alternately fill said second variable volume compartment with the volume of fluid, when said flow control device is in the open position, and eject the volume of fluid from said second variable volume compartment through said fluid outlet when said flow control device is in the closed position.