Controllable liquid dispenser

摘要

An improved liquid dispenser has two concentrically spaced cylinders with a pump plunger fitting the inner cylinder, an inlet check valve at the bottom of the outer cylinder, and an outlet check valve adjacent the top of the outer cylinder with a graduated stem extending upwardly from the plunger through a cap structure adapted to engage the open top of a liquid container. The pump plunger is restrained from moving upwardly out of the inner cylinder and a collar is adjustably mounted on the stem above the cap for setting the pump stroke as indicated by the graduations on the stem to thus provide a dispenser adapted to fit containers having a small opening therein.