Spraying gun for metal spraying

A metal spraying gun comprising:

• a unitary housing;
• a handle for the housing;
• a heat insulating layer between the housing and the handle to prevent the passage of heat from the housing to the handle;
• an adjustable spray nozzle having an outlet positioned at the forward end of the housing;
• a fuel gas burning chamber in the housing positioned above and rearwardly of the spray nozzle;
• a heatable container for the material to be sprayed through the nozzle, said container being carried at an angle at the forward end of the housing rearwardly of the spray nozzle and having one end thereof extending into the gas burning chamber of the housing;
• a gas heating device positioned in the housing rearwardly with relation to the gas burning chamber, said gas heating device including a fuel gas inlet valve at the rear of the housing connectable to a source of fuel gas and a longitudinally extending gas burner tube in communication with the fuel gas inlet valve and the gas burning chamber;
• a single, longitudinally extending pressurized air passageway in the housing positioned below the gas heating device for entraining material from the heatable container, said passageway being in communication with pressurized air inlet means at the rear of the housing and with a pressurized air chamber positioned in the housing rearwardly of the spray nozzle;
• a needle valve extending parallel to the longitudinal axis of the housing from a rear portion of the housing to the nozzle outlet for controlling the flow of material through the nozzle;
• a pressurized air control valve in the housing in communication with the pressurized air source and the pressurized air chamber for regulating the flow of pressurized air to the nozzle outlet and trigger means adjacent to the handle for actuating the pressurized air control valve and subsequently the longitudinally extending needle valve.