EP 0381072 A2 19900808 - High volume low pressure air spray gun.
Title (en)
High volume low pressure air spray gun.
Title (de)
Hochdurchfluss-Niederdruck-Luftspritzpistole.
Title (fr)
Pistolet de pulvérisation à fort débit d'air basse pression.
Publication
Application
Priority
US 30651789 A 19890203
Abstract (en)
A high volume low pressure air spray gun (20) has an atomizing air orifice (76) for atomizing a stream of liquid coating material into a conical spray and opposed side port air orifices (88) for flattening the spray into a fan-shaped pattern. The gun receives air at pressures up to about 100 psi, and an air flow restriction in the form of a venturi (110) is in an air supply passage in the gun barrel. A valve stem (54) for controlling the flow rate of air to the side port orifices (88) extends through the venturi (110), and is configured to vary the venturi air flow area in response to changes in the flow rate of air to the side port orifices. When the valve stem (54) is positioned for maximum air flow to the side port orifices (88), it establishes a maximum air flow area through the venturi (110) , such that a high pressure of air at the gun air inlet, after flowing through the venturi, results in a high volume low pressure air flow at the atomizing and side port orifices (88). When the valve stem (54) is positioned to reduce air flow to the side port orifices (88), it correspondingly reduces the flow area through the venturi (110) to maintain the pressure of air at the atomizing orifice below a selected maximum value. The gun may carry a paint cup (124), in which case the cup is pressurized by air downstream from the venturi to prevent overpressurization of the cup.
IPC 1-7
IPC 8 full level
B05B 7/02 (2006.01); B05B 7/08 (2006.01); B05D 1/00 (2006.01); B05D 1/02 (2006.01); B05B 7/00 (2006.01)
CPC (source: EP)
B05B 7/0081 (2013.01); B05B 7/0815 (2013.01); B05B 7/0838 (2013.01); B05B 7/241 (2013.01)
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0381072 A2 19900808; EP 0381072 A3 19910731; EP 0381072 B1 19940601; AT E106282 T1 19940615; AU 4882590 A 19900816; AU 618166 B2 19911212; CA 2007963 A1 19900803; DE 69009201 D1 19940707; DE 69009201 T2 19940908; JP H03178355 A 19910802; JP H0741181 B2 19950510
DOCDB simple family (application)
EP 90101583 A 19900126; AT 90101583 T 19900126; AU 4882590 A 19900125; CA 2007963 A 19900117; DE 69009201 T 19900126; JP 2428890 A 19900202