Spray gun with barrel-mounted venturi

A spray gun comprising:

• a spray head;
• a housing comprising a barrel supporting the spray head, an inlet port for receiving a flow of compressed air spaced from the spray head and an internal air flow path directing the flow of compressed air from the inlet port into the barrel and leading into the spray head, the flow path having a spray head portion and a rear portion;
• means for entraining ambient air into the barrel in response to the flow of compressed air, the air entraining means comprising a venturi mounted within the internal flow path in the rear portion thereof to discharge a stream of compressed air downstream into the flow path and an orifice formed in the barrel proximate to the venturi, the venturi having an inlet and an outlet, a sealed passage extends between the inlet port and the venturi inlet, the venturi is shaped to force the received compressed air through the venturi outlet;
• means for delivering a liquid from a container to the spray head for discharge through the spray head, the liquid delivering means comprising a liquid flow path, the liquid flow path and the spray head portion of the air flow path have a common axis and the liquid flow path and the rear portion of the air flow path have separate spaced apart axes;
• and
• means for controlling the flow of compressed air, the flow controlling means comprising an air valve in the flow path upstream of the venturi for shutting off the flow of compressed air along the flow path and selectively enabling and disabling the flow of compressed air.

A spray gun comprising:

• a spray head;
• a housing comprising a barrel supporting the spray head, a handle extending transversely from the barrel, an inlet port for receiving a flow of compressed air, and an internal flow path comprising a passage extending from the inlet port toward the barrel and directing the flow of compressed air form the inlet port into the barrel and leading to the spray head;
• means for entraining ambient air into the barrel in response to the flow of compressed air, the air entraining means comprising a venturi mounted within the barrel to discharge a stream of the compressed air downstream into the flow path and an orifice formed in the barrel proximate to the venturi and the venturi comprising an inlet sealed to the passage to receive the compressed air flow along a first axis and an outlet for discharging the stream of compressed air along another second axis transverse to the first axis, the venturi being shaped to force the received compressed air flow through the outlet;
• means for delivery a liquid from a container to the spray head for discharge through the spray head;
• and
• means for controlling the flow of compressed air, the flow controlling means comprising an air valve in the flow path upstream of the venturi for shutting off the flow of compressed air along the flow path and a manually-operable trigger controlling the air valve to selectively enable and disable the flow of compressed air.

A spray gun comprising:

• a spray head;
• a housing comprising a barrel supporting the spray head, a handle extending transversely from the barrel, an inlet port attached to the handle for receiving a flow of the compressed air, and an internal flow path directing the flow of compressed air from the inlet port into the barrel and leading to the spray head, the internal flow path comprising a passage extending from the inlet port toward the barrel;
• means for entraining ambient air into the barrel in response to the flow of compressed air, the air entraining means comprising a venturi comprising an inlet sealed to the passage to receive the compressed air flow along a first axis and an outlet that discharges a stream of the compressed air directly into the barrel along a second axis transverse to the first axis and an orifice formed in the barrel proximate to the venturi;
• means for delivering a liquid from a container to the spray head for discharge through the spray head;
• and,
• means for controlling the flow of compressed air, the flow controlling means comprising an air valve mounted in the handle and in the passage for shutting off the flow of compressed air along the flow path and manually-operable trigger controlling the air valve to selectively enable and disable the flow of compressed air.