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Патент USA US2119282

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' May 31, 1938.
J‘ E_ LUDWIG
2,119,282
SPRAY BOOTH
Filed Aug. 24, 1936
INVENTOR.
BY ' f/QJHNE. LUUWIE
WQM
ATTORNEY.
'
2,119,282
UNITED STATES‘ PATENT OFFICE
Patented May 31, 1938
2,119,282
SPRAY BOOTH
John E. Ludwig, Detroit, Mich, assignor to
De Vilbiss Company, Inc., Toledo, Ohio, a cor
poration of Ohio
Application August 24, 1936, Serial No. 97,533
11 Claims. (Cl. 91—-60)
My. invention pertains to ventilated spraying ganization and its method of operation together
booths and more particularly to spraying booths
of the type suitable for continuous production
spraying.
It is an object of my invention to provide a
ventilated spraying booth comprising a forced
alr‘inlet header having airldirecting means asso
ciated therewith for directing a flow of air
downwardly at relatively low velocity adjacent
the object being sprayed and having high ve
locity air projecting means for projecting a thin
blast or sheet of air downwardly at high ve
locity between the object and the low velocity
air to aid the operator in applying a smooth
15 even coating of paint on the object and to protect
him from inhaling the poisonous fumes thereof.
It is a further object of my invention to pro
vide a spraying booth comprising an air ventilat
' ing means wherein fresh air'is forced into the
20 spraying booth through an inlet header which
comprises low velocityvdirecting outlets on the
lower wall at opposite sides of the housing for
directing a large volume of air downwardly at
low velocity on opposite sides of the object being
25 sprayed, also narrow air projecting nozzles for
projecting thin sheets of air downwardly at high
velocity adjacent the opposite sides of the object
between the object and the low velocity air,v and
3
additional air projecting means for projecting a
sheet of air at high velocity across the ceiling
between the downwardly projected air streams.
The purpose of this ‘sheet of air at high velocity
crossing the ceiling is not only to aid in carry
ing o? fumes, but it is also useful in preventing
the curtains of high velocity air from creating a
vacuum adjacent the object being sprayed which
with additional objects and advantages thereof
will best be understood from the following de
script-ion of a speci?c embodiment, when read
in conjunction with the accompanying drawing,
in which:
,
Fig. 1 is a side elevational view of my venti
lated paint spraying booth partially sectioned
and .broken away to clearly show the internal
construction thereof and the circulation of air
provided therein;
Fig. 2 is an enlarged sectional view thereof
showing the arrangement of the ,inlet header with
the high velocity air projecting nozzles and the
low velocity air directing grills; and
15
Fig. 3 is an elevational view of a low velocity '
air admitting grill provided in one side of the
ventilating header.
_
_
Referring more particularly to Figs. 1 and 2
of the drawing, my ventilated spray booth com 20
prises a housing enclosed by side walls I and 3
and a roof 5 through which the objects to be
sprayed are continuously passed. The spray
housing is provided with a ?oor ‘I spaced above
the ?oor 9 of the factory and provided with aper 25
tured exhaust grills H and I3 which are spaced
from the side walls i and 3 of the housing. ‘The
exhaust grills H and I3 are extendedvhorizontally
along the floor ‘I of the ‘housing, and may com
prise any suitable open-work grating or the like. 30
The objects to be sprayed are transported through
the spray booth‘over the floor "I and between the
exhaust grills II and I3 in any convenientman
ner as on an endless conveyor for example.
For supplying ventilating air to the spray
booth, I provide a motorized exhaust fan l5
would then otherwise tend to cause said high ' therein for drawing air through an air intake
velocity air streams to hug tightly to the object conduit H which extends upwardly and passes
being sprayed. This laterally projected air sub
through the roof ill of the factory, where fresh
sequent to its travel across the ceiling moves air is drawn in through an, elbow-2|.
40
_For properly distributing the ventilating air
downwardly comparatively slowly between the
downwardly projected high velocity air streams in the spray booth to carry the poisonous fumes
permitting them to maintain a substantially di
away from the workman and to aid him in prop
- rect path from inlet to‘outlet.
It is also anvobject of my invention to provide
is01
a ventilated spraying booth comprising a ?oor
having spaced exhaust apertures therein, an ex
h'aust fan for drawing air rapidly from the booth
through the exhaust'apertures, an air intake
60 fan having air directing means for directing a
volume of fresh air downwardly on opposite sides
of the object to be sprayed, and air projecting
nozzles for directing thin sheets of air down
wardly at high velocity adjacent the opposite
55 sides of the object between the object and the
large volume of downwardly directed air where
by the ventilating air is aided by gravity in
carrying the obnoxious spray vapors awayfrom
the operator.
,
a,
.
The invention, however, both as to it's or
erly distributing the sprayed material to provide
a smooth coat upon the object, the lower end of
the intake air conduit i1 is provided with a trans
versely disposed header 23 of ?at shallow con
struction which is transversely disposed in the
spraying booth over the objects to be sprayed.‘
The header is provided with inlet grills 25 and
21 which are mounted-in the lower wall of the
header on opposite sides of the position occupied
by the object being sprayed. For this purpose,
any'suitable grill or open wire-work construc
tion may be utilized.
In the intermediate portion of‘ the lower wall
of the intake header 23, I provide a closed panel
'29 which is bulged upwardly in the middle to
provide a convex surface disposed substantially
over the position occupied by the object being 60
2
2,119,282
sprayed. The panel 29 extends the length of the
header between the end walls thereof and is pro
vided with marginal ?anges 3| and 33 at its left
and right hand ‘edges respectively which are
5
turned upwardly in a substantially vertical posi
tion.
Parallel to and spaced from the upturned
?ange 33 at the right hand edge of the panel 29,
I provide a vertical partition 35 which rises from
_ the lower wall of the intake header.
10
The uppermost edge of the partition 35 is pro
vided with a vane 39 which is turned horizontally
toward the center of the header and is suitably
spaced from the upper wall 31 of the header to
de?ect the air and to de?ne an air inlet conduct
ing passage of suitable size for receiving the air
which passes downwardly through the grill 21
of the header with relatively "low velocity. The
vertical panel-?ange 33 likewise carries at its
upper edge vane portion 4| turned toward the
20 center of the header and which, with the vane
39, de?nes a passage for de?ecting and receiving
the proper volume of air which passes down
wardly through the duct defined between the
?ange 33 and the partition 35 into the spray
25 booth. The vertical walls 33 and 35 thus de?ne
a nozzle for projecting a ?at blast or sheet of
air downwardly with high velocity adjacent the
side of the object being sprayed and between it’
and the larger volume of low velocity air which is
30 directed downwardly from the grill 21.
For directing a sheet of high velocity air under
and adjacent to the concave face of the closed
panel 29, I provide a vertically disposed partition
defusing globe of a suitable illuminating unit
which, as will be readily understood, may be of
suitable streamlined conformation to avoid set
ting up eddies in the air stream.
'
‘Flor e?iciently exhausting the air from the
spray booth and to aid the air projecting nozzles
and grills in providing a smooth uniform circu
lation of the air therein, I provide an exhaust fan
51 which is connected through a conduit 59 which
connects into the air space defined under the 10
?oor 1. At the left hand side of the exhaust
grill II, a partition 61 is preferably inserted for
restricting the exhaust passage de?ned there
under.
In operation, the objects to be sprayed are 15
moved through the spray booth in any suitable
manner as upon a continuous conveyor
(not
shown), and as the attendant standing at one
side of the spray booth sprays the object, the
high velocity sheets of air 1| and 13 respectively 20
projected downwardly on opposite sides of the
object tend to protect him effectively from inhal
ing the poisonous vapors.
If the paint spray is discharged strongly against
the object being coated there is considerable re 25
bound of spray fumes which occasionally pene
trate the high velocity streams. The addition of
low velocity air between the object and high ve
locity streams impedes the rebound and thereby
assists the high velocity streams in preventing 30
the fumes from reaching the operator.
Also the larger steams 15 and 11 of low velocity
air projected downwardly from the grills 25 and
wall which extends across the header in spaced
21 insure the sprayer a fresh supply of air at
35 relation from the left hand panel-?ange 3| and
which, along its lower edge, is provided with a
all times, and the circulation of the air above
andaround the object at all times aids in properly
horizontally disposed ?ange 45 which projects
applying a smooth coat of the sprayed material .
underand spaced from the closed panel 29. The
air de?ecting ?ange 45 is provided along its edge
40 with an upturned vane portion 41 which is spaced
substantially parallel with the under surface of
the panel 29 whereby a thin jet or sheet of air
is projected at high velocity along the under side
of the panel 29 toward the jet of air which is
45 projected downwardly from the right hand side
of the panel 29. The vertical partitions 3| and
43 are preferably provided at their upper edges
with de?ecting vanes 44- and 46 respectively
turned toward the center of the header.
For projecting a high velocity sheet of air
50
downwardly adjacent the left hand side of the
object being sprayed, I provide a vertical partl
tion 49 which passes through the header in pare
allel spaced relation from the ‘partition 43 and
55 de?nes a high velocity projecting duct therebe
tween. This high velocity nozzle projects a sheet
00
65
70
75
upon the object.
The jet of high velocity air coming through
the passage between the vertical partitions 3|
and 43, and which starts out in the direction of
the arrows under the panel 29 becomes substan
tially two’ low velocity streams of air passing
downwardly on each side of the article being
sprayed, due to the eddies or suction effect set 45
up between high velocity streams 1| and 13.
The turns and narrow sections of the passage
for the air passing between vane 41 and panel
29 prevent‘ the resulting air jet from having as
much bulk or as high velocity as the vertical 50
sheets of air 1| and 13. It therefore is lacking
in carrying power and is in?uenced by the down
ward pull of the suction set up by the high
velocity sheets 1| and 13. A portion of the jet
near sheet 1| will be attracted by it and travel 55
with it to the exhaust opening while a major
of air downwardly between the object being part of the jet will continue forwardly until it is
sprayed and the larger volume of low velocity air turned downwardly by sheet 13. The general
passing downwardly from the grill 25 at the left downward movement of the air jet is caused by
hand side of the panel 29. The upper edge of . the pull of the air sheets 1| and 13 and has 60
the partition 49 is provided with a horizontally therefore less velocity than have these sheets.
disposed ?ange 5| which projects 4 toward the
The above advantages are also augmented by
middle of the header and is spaced. from theupper gravity when the air inlets are above the outlets.
wall 31 of the header for de?ning an air conduct
In applicant's construction more effective protec
ing passage suitable for passing a proper volume tion is provided for the attendant whereby he 65
of air from the conduit through the low velocity can closely and clearly see his work.
grill 25.
,
Although I have shown and described a speci?c
The low velocity air inlet grills 25 and 21 re
embodiment of my invention, I am aware that
spectively may be of any suitable open-work but many modifications are possible, my invention
I preferably providea grill comprising‘a plurality therefore is not to be restricted except insofar 70
of metallic bars 53 securedtogether in parallel as it is limited by the prior art and the scope ’
relation by transversely‘ disposed rods 55, as of the claims.
shown in Fig. 3. For providing e?icient illumi
I claim:
‘
nation, a circular aperture 58 is provided in the
1. A ventilated spray booth having air supply
center of the grill for mounting the re?ector and means for supplying fresh air to said booth, an 75
2,119,282
air inlet header associated therewith, low veloc
ity directing means connected with said header
for directing a large volume of air to flow in a
path adjacent the object being sprayed, and an
air projecting nozzle for projecting a sheet of air
at high velocity between said large volume of
moving air and the object being sprayed.
2. A ventilated spray booth having air supply
means for supplying fresh air to said booth, an
H) air inlet header connected therewith, an open
grill in the lower wall of said header for direct
ing a large volume of air ‘to ?ow in a path adja
cent the object being sprayed, and an elongated
air projecting nozzle opening from the lower face
of said header for projecting a thin sheet of air
to flow downwardly at high velocity between said
large volume of downwardly ?owing air and the
object being sprayed.
-
'
3. A ventilated spray booth having air supply
means for supplying fresh air to said booth, an
air inlet header connected therewith, spaced air
projecting nozzles for sheets of air at high veloc
ity on opposite sides of objects to be sprayed and
means for supplying lower velocity air between
said sheets of air at high velocity.
_
4. A ventilated spray booth having an air inlet
conduit for supplying fresh air to said booth, an
air intake fan for forcing the air downwardly
through said conduit, an air inlet header con
30 nected therewith, low velocity air directing means
in the lower face of said header at opposite sides
thereof comprising an open grill work for direct
ing large volumes of air downwardly on opposite
sides of the object being sprayed, elongated slots
35 in the lower face of said header at the adjacent
edges of said spaced grills for directing thin
sheets of air downwardly at high velocity adja
3
for directing large volumes of air downwardly
outside of said high velocity sheets of air.
7. An air inlet header for ventilating a paint
spraying booth comprising an elongated casing
of ?attened conformation adapted to be con
nected with an air inlet conduit, a solid ceiling
panel extending across the middle of the lower
wall, of said casing, air outlets of substantially
broad area on opposite sides of said panel, and
elongated slots extending along the opposite edges 10
of said panel adjacent said outlets for project
ing thin sheets of air therefrom.
8. An air inlet header for ventilating a paint
spraying booth comprising an elongated casing
of ?attened conformation adapted to be con
nected with an air inlet conduit, a solid ceiling
panel extending across the middle of the lower
wall of said casing, air outlets of substantially
broad area in the lower face of said header on
opposite sides of said panel, elongated slots along
the opposite edges of said panel adjacent said
outlets for projecting thin sheets of air there
from at high velocities, spacedpartition walls
projecting into said header from the opposite
edges of said slot for de?ning an air projecting
nozzle and passage connecting from the interior
of said header.
9. An air inlet header for ventilating a paint
spraying booth comprising an elongated casing
of ?attened conformation adapted to be con
nected with an air inlet conduit, a solid ceiling
panel extending across the middle of the lower
wall of said casing, air outlets of substantially
broadarea in the lower wall of said header on
opposite sides of said panel, elongated slots along
the opposite edges of said panel adjacent said
outlets for projecting thin sheets of air there
cent the inside each stream of slow moving
from, spaced partition walls projecting into said
air.
header from the opposite edge’ of said slot for _
5. A ventilated spray booth having a housing de?ning an air projecting nozzle and passage 40
enclosed by side walls and a roof for de?ning the connecting from the‘ interior of said header, a
space through which objects are transported to ceiling panel ventilating slot extending adja
be sprayed, a ?oor in said housing, spaced ex
cent one edge of said panel, and an air projecting
haust apertures in said ?oor, for' drawing air -vane connected from the lower edge of said slot
45 from said booth at opposite sides of the sprayed spaced from and substantially parallel to the
object, an exhaust fan connected for drawing lower face of said panel for-directing a thin sheet
air therefrom, an air supply conduit for supply
of air thereacross.
ing fresh air in said housing, an intake fan asso
10. An air inlet header for ventilating a paint
ciated therewith for forcing air downwardly spraying booth comprising a ?at casing having
air outlets of broad area spaced in the lower wall
50 through said conduit, an air inlet header con
nected therewith, low velocity air directing means on opposite sides of the header, a solid panel dis
for directing streams of air downwardly adjacent posed in the lower face of said casing between
opposite sides of the sprayed‘ object, and highv said outlets, said panel comprising a concave
velocity air projecting means associated with lower face, an air projecting nozzle for project
ing a thin stream of air at high velocity across
55 said header for projecting thin sheets of air down
wardly at high velocity on both sides of the the lower face of said panel, spaced air project
40
sprayed object between the object and the slowly
ing nozzles of elongated conformation disposed
moving streams of air.
6. A ventilated spray booth having a housing
60 for enclosing a space through which objects may
be passed for spraying comprising side walls and
a roof, a floor in said housing, spaced exhaust
apertures in said ?oor, an exhaust fan for drawing
air rapidly from said housing through said ex
65 haust apertures, an air inlet conduit for supply
ing fresh air to said housing, an air intake fan
for forcing air downwardly through said con
duit, an air inlet header connected therewith,‘
high velocity air projecting means associated
therewith for projecting thin sheets of air down
wardly at high velocity in spaced relation toward
the spaced exhaust apertures in said ?oor, and
low velocity air directing outlets in said header
on opposite sides of said panel for projecting thin
sheets of air downwardly at high velocity there
from, and partition walls projecting inwardly in
to said header from the opposite sides of said slots
for de?ning air ducts or nozzles leading thereto
and for providing sufficient back pressure to
project the high velocity blasts of air while di
recting a suitable volume of air to supply the
large low velocity openings.
11. A ventilated spray booth having air supply
means for supplying fresh air to said booth, an
air inlet header associated therewith, a discharge
nozzle for projecting a sheet of air at high veloc
ity to one side of the object being sprayed and
discharge means for projecting air at low velocity
on both sides of the sheet'of high velocity air.
JOHN E. LUDWIG.
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