| (19) |
 |
|
(11) |
EP 0 365 225 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
14.11.1990 Bulletin 1990/46 |
| (43) |
Date of publication A2: |
|
25.04.1990 Bulletin 1990/17 |
| (22) |
Date of filing: 13.10.1989 |
|
| (51) |
International Patent Classification (IPC)5: B05B 7/14 |
|
| (84) |
Designated Contracting States: |
|
AT BE CH DE ES FR GB GR IT LI LU NL SE |
| (30) |
Priority: |
20.10.1988 US 260811
|
| (71) |
Applicant: NORDSON CORPORATION |
|
Westlake
Ohio 44145-1148 (US) |
|
| (72) |
Inventors: |
|
- Mulder, Douglas C.
Wellington
Ohio 44090 (US)
- Molnar, Julius J.
Amherst
Ohio 44001 (US)
- Becker, Richard A.
Lorain
Ohio 44052 (US)
|
| (74) |
Representative: Allen, Oliver John Richard et al |
|
Lloyd Wise, Tregear & Co.,
Commonwealth House,
1-19 New Oxford Street
London WC1A 1LW
London WC1A 1LW (GB) |
|
| |
|
| (54) |
Powder or solid particulate material spray gun |
(57) A powder spray gun comprises a tubular housing (12) having ambient air flow passages
(40) located in the sidewall thereof medially of the opposite ends. A pair of air
flow amplifiers (14,16) are mounted in the housing (12) on opposite sides of the ambient
air flow passages and are so oriented that compressed air supplied to the upstream
one of these amplifiers, the so-called suspension amplifier (14), is operable to draw
ambient air into the outlet end of the suspension amplifier, and compressed air supplied
to the downstream amplifier, the so-called pattern amplifier (16), is operable to
draw ambient air into the inlet end of the pattern amplifier. The spray gun (10) includes
means (190) for preventing the egress of powder through the ambient air flow passages
of the housing caused by back pressure generated by a restricted discharge orifice
of a powder discharge nozzle of the gun.