Apparatus for spraying plastic materials

Claim 1

APPARATUS FOR THE PURPOSE SET FORTH, COMPRISING A SPRAY GUN FOR APPLYING PLASTIC MATERIAL OF THE POLYESTER RESIN TYPE, SAID SPRAY GUN HAVING A NOZZLE INCLUDING A TRIGGER-CONTROLLED ORIFICE FOR DISCHARGING A MIXTURE OF THE RESIN AND AN ACCELERATOR, AN AIR CAP HAVING A SPRAY APERTURE FOR ATOMIZING THE MIXTURE DISCHARGED FROM SAID ORIFICE, A VALVE MEANS MOUNTED ON THE GUN, MEANS CONNECTING THE INLET OF SAID VALVE MEANS TO A SOURCE OF LIQUID CATALYST, MEANS FOR ACTURATING SAID VALVE MEANS TO OPEN AND CLOSED POSITION SIMULTANEOUSLY WITH OPENING AN D CLOSING OF SAID ORIFICE BY SAID TRIGGER, AND MEANS FOR FEEDING SAID CATALYST FROM THE OUTLET OF SAID VALVE MEANS TO SAID AIR CAP, SAID AIR CAP BEING FORMED WITH MEANS FOR INJECTING CATALYST DIRECTLY INTO SAID SPRAY APPERTURE OF SAID AIR CAP FROM A SOURCE EXTERNAL TO SAID NOZZLE AND AIR CAP, SAID LAST-NAMED MEANS BEING OPERATIVE TO CAUSE THE CATALYST TO CREATE TURBELENCE INTERIORLY OF SAID AIR CAP SUFFICIENT TO EFFECT SUBSTANTIALLY UNIFORM MIXING OF THE CATALYST WITH THE RESIN DISCHARGED FROM SAID ORIFICE.