Adjustable volume setting mechanism for repeatable fluid discharge device

Claim 1

A fluid dispenser for dispensing selected predetermined volumes of fluid from a container, comprising: barrel means for disposition into the container for receipt of fluid therefrom; plunger means mounted in said barrel means and having a passageway therethrough for passage of fluid from said barrel upon movement of said plunger means with respect to the container; said plunger means having a plurality of grooves of varying lengths formed thereon; a cap for mounting said barrel means with the container, said cap having a plurality of position-locating recesses formed therein, said cap further having an opening formed therein for passage of said plunger means therethrough; indexing pin means for movement into selected ones of said recesses in said cap when aligned therewith; turret means mounted with said cap, said turret means having an opening therein for passage of said plunger means therethrough, said turret means further having said indexing pin means mounted therewith and being movable with respect to said cap to align said indexing pin means with selected ones of said position-locating recesses; and guide means mounted with said turret means adjacent said opening therein for engagement with a selected groove in said plunger means according to the position of said indexing pin means in a selected one of said recesses in said cap, for limiting the amount of movement thereof to permit passage of a predetermined amount of fluid therethrough for dispensing from the container.