Patent ID: 8568104

Claim:
A proportioner for dispensing plural component materials, said proportioner comprising: A variable speed electric motor having a shaft and first and second ends, said shaft extending from each of said ends; a first reciprocating piston pump attached to said first motor end, said pump being connected to a source of a first material and having an output which has a first pressure; a second reciprocating piston pump attached to said second motor end, said pump being connected to a source of a second material and having an output which has a second pressure, said pumps simultaneously pumping said materials to an applicator, wherein the materials being pumped from the first and second pump do not pass through another pump; and a controller with provision for a user-selectable pressure setpoint, said controller continually comparing said first and second pressures and regulating the higher of said pressures to said setpoint, said first and second pumps being the only pumps between said material sources and said outputs.