GEORGE PHILIP WALKER
Pharmacy in Pittsburgh, PA

4091969, May 30, 1978

Aug 4, 1976

5/711495

William M. Easter - Pittsburgh PA
Charles V. Wilhere - Pittsburgh PA
George M. Walker - Pittsburgh PA

Horix Manufacturing Company - McKees Rocks PA

G01F 1106

222309

The upper edge of a cup-shape flexible diaphragm in the lower part of a vertical dispensing cylinder is sealed to the side of the cylinder, with the bottom of the diaphragm engageable with the bottom of the cylinder around an inlet and outlet port to close it. The bottom wall of the diaphragm may have a central thickened portion for engaging the bottom wall of the cylinder, with the rest of the diaphragm bottom spaced from the cylinder bottom wall. Engaging the side wall of the cylinder above the diaphragm is a piston having a lower portion filling the diaphragm cup and attached to its bottom wall. The diaphragm and piston are movable upwardly in the cylinder by liquid product forced up through the cylinder port, and the upper part of the cylinder has an inlet for air to move the piston and diaphragm downwardly to expel liquid product from the cylinder. A vertical rod mounted in the top of the cylinder and extending down into it and also above it has a lower end engageable by the upwardly-moving piston, the rod being adjustably vertically so that the distance the piston can rise in the cylinder is adjustable.