Importance

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Abstract

A side injection plural component spray gun having one or more injector assemblies mounted for injecting a catalyst into a main component at the most forward position of the spray gun. In one embodiment, the injecting assembly has an injection jet connected to the air path for injecting a catalyst into the air stream just before it exits a port for shaping the main component into a fan shaped pattern. The injection jet is constructed to minimize adverse effects on the air stream for shaping the spray pattern. In a second embodiment, dual injection assemblies inject catalyst for delivery through both shaping air ports on either side of the fan shaped pattern of the main component or allows injection of a third component. These embodiments minimize the build-up of catalyst on the walls and passageways of the spray gun minimizing the need for maintenance of the gun and preventing clogging and corrosion of passageways. The trigger for delivering the main component's air and catalyst is arranged to turn the catalyst on after the air, but before the resin, and off after the resin, but before the air to purge any small amounts of catalyst that might remain in the passageway. This eliminates the need for maintenance of the gun, the corrosion of internal parts, and the possible risk of unexpectedly getting catalysts on people or property, and use of undesirable solvents.

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First Claim