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Apparatus for feeding powder particles into a pressurized gaseous stream comprising a feed chamber having a helical particle feed channel, a reserve powder supply chamber above the feed chamber and a feed tube extended from the reserve powder supply chamber and arranged to deliver powder from the re

Apparatus for feeding powder particles into a pressurized gaseous stream comprising a feed chamber having a helical particle feed channel, a reserve powder supply chamber above the feed chamber and a feed tube extended from the reserve powder supply chamber and arranged to deliver powder from the reserve supply to the bottom of the feed chamber and form a powder deposit in the central region of the bottom wall and lying within the angle of repose of the powder, a delivery duct communicating with the helical particle feed channel, and means for controlling the feed rate comprising means for controlling the vibration of the feed chamber.

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Apparatus for feeding particulate material into a gaseous stream comprising means defining a helical powder feed channel with its inlet in a lower portion thereof and inclined upwardly to an outlet, mechanism for vibrating said feed channel to effect upward feed of powder particles in the channel, a

Apparatus for feeding particulate material into a gaseous stream comprising means defining a helical powder feed channel with its inlet in a lower portion thereof and inclined upwardly to an outlet, mechanism for vibrating said feed channel to effect upward feed of powder particles in the channel, a pressurized chamber having walls surrounding and spaced from the feed channel and mounted independently of the vibratory feed channel, a gas flow duct penetrating a wall of the pressurized chamber and having an upwardly open upwardly presented inlet orifice within the pressurized chamber, said gas flow duct and its upwardly presented inlet orifice being mounted independently of the vibratory feed channel, and a conduit mounted independently of said duct and rigidly connected with the vibratory feed channel and having a straight inlet end passage positioned in substantially tangential relation to the vibratory helical powder feed channel to receive particulate material from said channel and having an outlet opening positioned above the inlet orifice of said duct to deliver particulate material downwardly into the upwardly presented inlet orifice of said gas flow duct, the outlet opening of said conduit being vibratory with the feed channel independently of the inlet orifice of said gas flow duct, the inlet end of said flow duct comprising an upwardly flared funnel, and the delivery end of said conduit extending downwardly into said funnel in spaced relation to the walls thereof.