Foam gun for mixing and dispensing two reactants

Claim 1

A dispensing gun adapted to be connected to separate pressurized fluid components for the supply of foam reactants, comprising: a body component having an upper barrel with a longitudinal bore and a pistol grip below the barrel, said barrel having a rear wall with an opening coaxial with said bore, said barrel further having an upper rear portion carrying a rearwardly directed resilient lock member, said pistol grip having opposed rearwardly directed flanges defining a vertical slot for housing a squeezable trigger; a trigger component having a rearwardly projecting lower portion, a medial portion pivotally mounted at the upper end of said pistol grip vertical slot and an upper portion alignable with said rear wall of the barrel said upper portion having a safety lock flange; a reactant supply and mixing component positioned adjacent the front end of said barrel bore and having a sleeve with a plurality of ports for the supply of foam reactants, each said supply port extending through a coupling stud for connection thereof to length of flexible tubing extending to a remote container for a foam reactant; a reciprocating valve rod component positioned coaxially within said opening in said rear wall of the barrel for connection to said upper portion of the trigger component, the front end of said rod carrying an elongate valve element having an outer diameter coincident with the inner diameter of said sleeve so as to open or close said supply ports and to purge said sleeve of foam reactants; there further being bias means to urge said valve element into said sleeve to normally close said supply ports while purging said sleeve and to move said lower trigger portion rearwardly of said pistol grip, said lock member on said barrel being normally positioned to engage said safety lock flange on said trigger component when said valve element is positioned to close said supply ports.