Patent ID: 8590810

Claim:
An air spray gun comprising: an air flow passage in the gun; a spray liquid nozzle mounted in the air flow passage and having: an orifice for spray liquid to flow from on the downstream side of the spray liquid nozzle with respect to both air and spray liquid flow; a needle extending from upstream into the spray liquid nozzle for regulating its orifice and flow of the spray liquid; a spray liquid flow passage to the spray liquid nozzle, with the needle extending in the spray liquid flow passage; a flow-passage/needle seal at a position along the needle spaced from the spray liquid nozzle; a trigger mechanism connected to the needle to regulate its position; an air cap defining with the spray liquid nozzle: a convergent air flow region immediately upstream of the spray liquid orifice; a central opening from which spray liquid entraining air flows; and a pair of opposed horns having spray patterning bores with orifices directed inwards for patterning the spray liquid containing air flow from the central opening and an air distributor upstream of the air cap for distributing air to the patterning bores; wherein: the air cap having two pairs of opposed horns; the four horns being set at 12 o'clock, 3 o'clock, 6 o'clock and 9 o'clock with respect to the normal orientation of the air spray gun; each horn having a spray patterning bore with an orifice directed inwards; the air distributor having a pair of diametrically arranged apertures through it; the air distributor being rotatable to connect its apertures with the spray patterning bores of at least one of the two pairs of opposed horns; and wherein: the air distributor has circumferential grooves facing the air cap, each groove having: substantially quarter-circle extent; and one of the diametrically arranged apertures communicating with it.