Patent ID: 8544689

Claim:
A hand held dispenser, comprising: a handle; a dispense material manifold supported by said handle; a dispense material mixing module supported at a forward, dispensing end of said manifold, said mixing module having a dispense material passageway that opens out to a dispenser outlet; a driver supported by said handle; a reciprocating member in driving communication with said driver and positioned for reciprocation in said mixing module; a drive train system positioned so as to convey drive from said driver to said reciprocating member; a first valve assembly and a first valve housing receiving said first valve assembly, and said first valve housing extending rearwardly off of a first side of a main body portion of said manifold such that said first valve housing is rearward of a rearward end of said mixing module; a first dispense material hose fitting in dispense material communication with said first valve housing; a second valve assembly and a second valve housing receiving said second valve assembly, and said second valve housing extending rearwardly off of a second side of the main body portion of said manifold such that said second valve housing is rearward of a rearward end of said mixing module; and a second dispense material hose fitting in dispense material communication with said second valve housing; wherein said first valve assembly is in fluid communication with a first material passageway located in said manifold, and said second valve assembly is in fluid communication with a second material passageway located in said manifold, said hand held dispenser further comprises an elongated heater cartridge received within an access cavity in said manifold arranged in a region between, and extending essentially parallel with, said first and second material passageways, said heater cartridge configured to maintain a desired dispense material temperature, said drive train system includes a ball screw transmission having a screw pitch of less than 11 degrees, and said mixing module includes a mixing module housing with a solvent access port leading to a plurality of solvent volume expansion cavities in an interior wall surface of said mixing module housing separated by mixing module interior component retention ridges.