Patent ID: 8308083

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 and including a tip extending into the spray liquid nozzle; a spray liquid flow passage in fluid communication with the spray liquid nozzle, with the needle extending in the spray liquid flow passage, the spray liquid nozzle being removable from the spray liquid flow passage; a 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, the air cap and spray liquid nozzle defining: 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; an air distributor upstream of the air cap for distributing air to the patterning bores; and wherein: the needle comprises: an exchangeable front part; a rear part with which the front part is removably engageable and to which the trigger mechanism connects; and a formation extending radially from the exchangeable front part with which the front part can be gripped for its exchange, the front part being removable from a front of the spray liquid flow passage upon disengagement from the rear part.