Abstract: An air distribution apparatus in a paint spray booth plenum for increasing the uniformity of down draft velocities from the plenum to the spray booth paint application zone. The increased uniformity of down draft velocities correspondingly increases paint transfer efficiency and minimizes paint overspray buildup in the paint application zone. The improved air distribution apparatus includes airflow regulating elements and flow directing members which cooperate to distribute airflow substantially evenly across the plenum floor and into the paint application area. In the preferred embodiment, a plurality of perforated plates and guide vanes are used to control the rate and direction of airflow in the plenum. The invention also provides for the adjustment of the rate and direction of flow through the use of slidable plates and adjustable guide vanes.

Abstract: A paint dosage device is particularly adapted to be mounted in close proximity to a spray gun (P) in a program controlled spray painting installation for dosed paint supply to the spray gun. The device includes at least two dosage cylinders (SA,SB), each having a regulating piston (PA,PB) connected to a piston departure position and displacement velocity regulator (RA,MA:RB,MB) for setting the paint filling amount of the associated cylinder by controlled adjustment of the departure position of the regulating piston in the cylinder, and for setting the dosage rate of the cylinder when supplying paint to the spray gun, by program controlling the displacement velocity of the regulating piston in the cylinder. A valve assembly (V1,V2,V3,V4) is arranged for connecting the cylinders (SA,SB) alternately to the spray gun (P) and putting the cylinder disconnected from the gun in connection with means for cleansing and paint filling apparatus.

Abstract: A powder hopper with an internal air assist is provided with at least one vertically extending tube having a plurality of air outlet ports which are utilized in agitating the powder within a powder chamber. According to a first embodiment, the vertically extending tubes are rotated about a central axis. According to a second embodiment, the vertically extending tube is divided up into a plurality of zones which are sequentially provided with pulses of compressed air, thereby providing an equivalent air agitation rotating action without the requirement of rotating the vertically extending tube.