Patent ID: 7159507

Claim:
A device useful for transferring quantities of a fluid from a reservoir to a downstream component, comprising: a cylinder housing having an axially extending cylindrical recess therein; a piston rotatably and reciprocally mounted within the cylindrical recess, the outer periphery of said first piston forming an interference fit with the inner periphery of said cylindrical recess; at least one groove in the outer periphery of said first piston, said groove extending parallel to the axial direction of said piston; said having an inlet port adapted to provide fluid communication between an inlet and said at least one groove when said piston is in a first position, and an exit port spaced from said inlet port providing fluid communication between said at least one groove and an outlet when said piston is rotated to a second position, and said piston moves to drive fluid out of said outlet; and a piston drive mechanism arranged to rotate the piston without translation thereof, and to translate the piston without rotation thereof.