Patent ID: 6257444
Filing Date: 2001-07-10
Classification: G01F

Abstract:
Precision dispensing apparatus for delivering a controlled amount of fluid to a selected location comprising:a) a housing having a longitudinal axis and a chamber therein and an outlet leading from said chamber for delivering fluid to said location, said chamber having a continuous surface curved in a direction alone said housing longitudinal axis and converging toward and to said outlet;b) an impeller rotatably mounted in said housing and including a body having an outer surface and a plurality of spaced apart blades located in said chamber and extending outwardly of and along said body of said impeller, each of said blades having an outer surface portion having a curvature substantially matching the curvature of said surface of said chamber;c) means for supplying fluid to said chamber between said blades;d) controlled drive means for rotating said impeller to move said blades within said chamber to force a controlled amount of fluid from said chamber through said outlet to said location; ande) the flow of fluid in said chamber to said outlet being defined exclusively between said blades and said outer surface of said impeller body and said surface of said chamber.