Mixing, metering and dispensing device

Abstract

A positive displacement material mixing, metering and dispensing device having a housing with a pair of material inlet ports, and a pair of material outlet ports which are in communication with a pair of holding cavities, and a pair of valve chambers. A spool is slidably mounted in each of said valve chambers. An air actuated piston is in contact with opposite ends of the spools. Each spool has a reduced diameter central portion which communicates with a respective one of the material holding cavities at all times, but is in communication with the inlet and outlet ports only at discrete positions in the operating cycle and is never in communication with both the inlet and outlet ports simultaneously. One end of a pair of push rods moves into and out of the material holding cavities, with the other ends of the push rods being simultaneously actuated by an air piston. In operation, the central portions of the spools are first moved into communication with the inlet ports to accept two different materials through the central portions, and into the holding cavities. The central portions of the spools are then moved out of communication with the inlet ports, and into communication with the outlet ports. Thereafter, the push rods are moved into the holding cavities and the materials held therein are forced through the central portions and through the outlet ports to provide for the positive discharge of the dual materials into a static mixer. The push rods are then moved out of the material holding cavities, and the central portions are moved back into communication with the inlet ports to receive second shots of the two materials.

Dependencies are inferred from the claim text.