Patent ID: 8418775

Claim:
A powder-spreading device comprising a sealed tank with a conical bottom, a vessel containing a pressurized spray gas and connected by a line to the volume of the tank, control means associated with said vessel and a powder-spreading nozzle connected to said tank, wherein said nozzle, of elongate shape, comprises a straight channel extending therein and at least two pressure-reducing stages able to break up the jet of powder emitted in order to form a uniform and homogeneous jet of relatively low velocity, the second stage being located near the free end of the elongate nozzle whereas the first stage is located on the opposite end of said elongate nozzle, wherein the first pressure-reducing stage of the nozzle provides the interface with the air gun and comprises a substantially tubular coupling of which the part intended to be inserted into said nozzle comprises a cylinder shape pierced with at least two holes in its main section and blanked off at its free end in order to force the powder to enter said nozzle via said holes.