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Патент USA US2404000

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_ Juiyl?, 1946.
'
G. 1.. ‘SHERWOOD,
2,404,000
COATING MACHINE AND METHOD OF‘COA‘I'ING
Flled July 24, 1940
5 Sheet§~$heet 1 ‘
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Juiy 16, 1946.
G. L. SHERWOOD
2,404,000
COATING MACHJENE AND METHOD OF ‘COATING
5 Shee’Ls-Sheet 2
Filed July 24, 1940 .
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INVENTOR
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Eu?y 13,6, 39%» ,
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a‘ a... SHERWQOD
‘2,404,000
COATING MACHINE AND METHOD OF COATING
Filed July 24, I940 _
5 Sheets-Sheet 3
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INVENTOR.
July 16;, 39¢”
O a L SHERWQQQ
2,404,000
COATING MACHINE AND METHOD OF COATING
Filed July 24, 1940
5 Sheets-Sheet 4
40
.21
1NVENTOR.
11$? iw?g
'
G. L. SHERWOOD
'
2,404,000
COATING MACHINE AND METHOD OF COATING’
'
Filed July 24, 1940
.5 Sheets-Sheet 5
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QLHa
INVENTOR.
2,404,000
Patented July 16, .1946
‘UNITED .‘STAT‘El-S PATENT OFFICE.
COATING MACHINE AND -METHOD OF
COATING
Glenn L. Sherwood, 'Benton Harbor, "Mich, as
signo‘r ‘to Kaywood‘ Corporation, Benton‘ Harbor,
Mich.,' aiico'rporation of Michigan
Application July 24, 1940,iseria1INo.1347.i35
I
iiolaiins.
1
.2
“ This ‘invention relates v'to coating machinery
are 'wound as‘they'coine from the drying ‘ovenof
and’more particularly‘to machinery of this" kind
for coating ,aistrippr ribbon of 'inaterial, such
the s'aid‘machine' or apparatus.
as ‘metalffor .use afterward in the construction
or manufacture of any desired Structure or ar
ticle of commerce.’
,
7
‘Generally stated, the object of ‘the invention
7 ofwhich latter rotate in'bearin'gs 3 of 'any suit
able “character. ‘The thin steel strips or ribbons
is to .provide an improved machine and an im
proved method ‘for use ‘in, the manufacture of
Venétian‘blinds orsiiriilar things, and to‘ provide
H
a machine and method ‘(for this purpose‘that will
substantially or‘materiallyreduce the cost of pro
duction of ‘the Venetian blinds "or other things,
ing oven 8, which latter is disposed vertically in
a vertical transverse plane and is of sui?icent
height ‘to ins'ure’the desired drying or .baking of
the enamel or paint on'the strips. ‘The coated
slats from which the blinds or other things are
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V
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4 are ‘carried on these reels and are pulled down
wardly from said reels through the enamel or
paint-Erin the container 6 and around the idlers
‘1 ‘a’n'd‘then upwardly through the drying orlbak
by simplifying and expediting the coating of the
made.
,
Fig. 3101s? a vertical ‘ fragmentary ‘section on'line
l‘ll-"l 0 in‘Fig. 2 of the drawings.
‘As thus illustrated, a plurality ‘of reels 1 is
mounted'on'a' singlehori‘zontal‘shaft 2, the ends
‘
and partially dried strips then move over ‘the
idlers .9 mounted at the ‘top-of ‘the machine or
apparatus and ‘are then pulled downwardly
m'e'thod'for coating a strip or ribbon of ‘cold rolled
steel with enamel or similar material, or with 20 around the'i'dler Ill and then vertically downward
inthe oven 8 until they ‘travel around the driving
paint of any desired‘character, in such alman
"More speci?cally iconsidered, the object of the
invention isi'toprovide an improved machine and
ner'that the enamelhor otherliquid material will
dry smoothly and effectively on the-‘surface of
the steelstrip or ribbon, sci-that the latter may
roll 'Il onthe horizontal shaft [2, which latter
is'the main driving shaft of the machine. “By
slats or. Venetian‘ blinds-or-other things.
move‘outside of the oven 8 for a distance before
details ‘and. ‘teatures of construction and “com
binationsitendi'ng to increase the general eii‘iciency
then pass under the rolls H and are woundon a
looking ‘at Figs. 1 and 3, it will be seenvrthat the
then becut‘into lengthssuitable-for ‘use as ‘the 25 downwardly moving coated portions of the strips
engaging the driving rolls I ‘I, and-the coated strips
It is also an object to provide certainlinove'l -
and desirability of an apparatus and method'of
this particular-character.
W
l
_
multiple spool rotating about an axis I3 which
30
H
'To the ;foregoing and other useful ends, the
invention consists in matters hereinafterset forth
and claimed and shown in the accompanying
drawings, in which—
Fig. 1 ‘is a side elevation of amachine pr vap
paratus embodying the principles-of the inven
tion, showing vcertain‘ portions ‘thereof ‘broken
away for convenience ofilluStration.
'Fig. 2'is a rear elevation ofthe structure-shown ~
in'v'Fi’g. 1 of the drawings.
_}
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‘
_
rotates ‘about a horizontal axis and is driven
from-the shaft [2 previously mentioned, so that
in this way the strips are pulled ‘through the
machine or apparatus and are then individually
‘wound tight in the circumferential grooves or
spaces of the spool, as indicated more clearly'in
Figs. 9 and 10 of the drawings. _
'lfhatis thegeneral plan of the apparatus and
method employed, -~and the ‘best results are ob
tained, it is found, when the oven heat'isma-in
tained at a-temperature anywhere from two hun
died and seventy -_to three hundred degrees
Fig.3 =is~a vertical sectional view onv-l-in‘e 3e-3
in'FigLZ of the drawings, on a larger scale.
'Fig. 4‘is a vertical‘section of a. portion of the
apparatus on line "4--4 ‘in Fig. 3 of the drawings.
Fahrenheit, so that the strips orrlbbons remain
approximately one-half an hour in the oven.
There is approximately eight hundred ‘feet of
Fig. 5 is an enlargedsectional view on-iline 5-5
preferably requires about eight hours to run ‘a
reel of the cold ‘rolled sheet steel ‘through the
i'n'jFig?2 of the drawings.
1
I
A
‘
strip or ribbon on the reel-l, preferably, ‘and it
“Fig.6 is a lperspectiveof the twoportions of
machine, so that it will ?nally emerge very
the device shown in Fig. 5 of the drawings. N
Fig. 7 is an enlargedhorizontalsectionon line '
smoothly and very satisfactorily coated with the
'I-‘Tin‘Fig. 5 ofthe drawings.
V ‘
Fig. 8 'is a'vertical section on'line 8-8 in ‘Fig.
enamel or paint or ‘any other liquid material.
Preferably, of course, 50 that a plurality of'strips
or ribbons can :be 'run through the machine at
the same time, and ‘coated in di?erent colors,
there'are as many containers B-as there'are-strips.
Fig. )9 is ‘a perspective of the reels .or lspools
uponwliich'the coated strips or ribbons of steel 55 to‘be coated, with a di?erent color of paint or
7 ofthe drawings.
’
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2,404,000
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enamel in each container. These enamel con
tainers are set in a water tank 14, and the water
is preferably maintained at a temperature of
about one hundred and twenty degrees, so that
the paint or enamel will have that temperature 5
while the strips or ribbons are passing through.
After the strips or ribbons come off the reel l,
tween which the tape or ribbon moves upwardly,
it being observed that the plate 34 is fastened to
the side walls of the paint or enamel container.
The plate 35 is subject to the action of the spring
or springs 36, through the medium of levers 31,
so that the ?at strip of metal is momentarily
made trough-shaped, as shown at 38 in Fig. '7
they pass through a brake device comprising rolls
of the drawings. _ In other words, it becomes par
[5 driven at a lower rate of speed than the tape
tially tubular, and anything tubular, or partially
or ribbon is moving, and the strips or ribbons are 10 so, is much stiffer and more rigid than a sheet or
held against these rolls by the felt brake device
l6 which is controlled by the tension spring or
springs H, and at this juncture it will also be
strip of metal in perfectly ?at form. In other
words, the plate 34 is concave, and the plate 35 is
- convex, in horizontal cross-section, and this
observed that the reel I is governed by a band
means that the strip or ribbon becomes momen
brake 13 which is under the tension of the spring 15 tarily shaped like a shallow trough in cross-sec
or springs i9, shown in Fig.‘ 3 of the drawings.
tion, and in that way it gains rigidity enough to
Everything is preferably driven from the shaft
prevent vibration thereof.
I2 previously described, in the manner indicated -
Moving at a comparatively slow rate of speed,
in Fig. 1 of the drawings, and this shaft is pref- ~
theascending portions of the tape or ribbons are,
erably driven by an electric motor 29 through a 9.0 in effect, wiped and freed of surplus paint or
reducing gear 2 i of any suitable character,
enamel at the surface of the body of liquid in
whereby the said driven elements of the machine
will each be given the predetermined speed nec
essary or desirable for doing the work in the re
quired manner.
each container.
In this way, there is'noidown
ward flow of the enamel or paint on the ascend
ing portions of the ribbons, and the liquid is
25 dried and baked in very smooth condition on each
Rolls 22'under the control of the springs 23
ribbon.
.
press the coated and dried ribbons against the
It has been found that when the tape or rib
under Sides of the roll H, as shown in Fig. 3 of
bons move about eighteen inches a minute, good
the drawings, and while this is su?icient to pull
results have been obtained, and good results have
the tapes or ribbons through the machine, it will 30 been obtained with cold rolled steel two inches
be seen that the spool or reel 13 is also driven by
wide and about eight-one-thousandths of an inch
the roller 24 which is belt-driven from the shaft
in thickness. Each strip or ribbon is about one
l2 previously mentioned.
minute in the paint bath, preferably, although
“ A heater 25, of any suitable character, is pro
this would probably change or vary for different
vided to furnish heated air to the oven, and this 35 kinds of enamel or paint or other liquid, and
is preferably accomplished by using a vertical air
the same is true of the time required in the dry
jacket 25 around the smoke~pipe 27, which latter
ing and baking oven. The proportions and the
may carry off the products of combustion from
general height of the machine or apparatus
the heater, assuming that oil or gas or fuel of
"should be, therefore, such‘ as to insure the above
some kind is burned in the said heater'to pro 40 figures. '
vide the required heat. The heated air in the
a With the apparatus and method as shown and
jacket 26 is discharged through pipes 28 into the
described, the coating of the tape or ribbon is
upper portion of the heater, and the motor
such that they can‘ be permanently pressed into
driven fan 29 then sucks the heated air down
trough-shape, to make them rigid, ‘as in the
wardly and through the pipe 36, where it is then
case of slats for Venetian blinds, and while the
discharged back into the said heater. Of course,
metal is thin-and'comparatively light, the slats
some fresh air enters the bottom of the heater
for blinds made in this way are surprisingly strong
at 3| to compensate for losses.
‘
and rigid. The forming of the strips or ribbons
Thus, looking at Fig. 1 of the drawings, it will
of metal in-this way, by converting each one into
lie-seen that the coated tape or ribbons travel a Ni a shallow trough, is done without correcting or in
distance in the atmosphereoutside of the oven,
any way damaging the dried, baked enamel or
after leaving the rollers 9, and then travel down
paint thereon. It thus becomes possible to make
"wardly inside of the heater, and then outside of
the coating step of the process a practically ‘con
the latter before reaching the driven rollers H,
tinuous one, as the coating is done on relatively
for it is found that in this way the enamel or 55 long strips instead of on short ones.
paint or other material is more satisfactorily
Obviously, there is considerable room or lat
dried and hardened;
itude for changes in the construction of the ap
Paintis supplied to the different containers 6
paratus shown and described, without going out
in any suitable or desired manner, as by simply
side the scope and‘spirit of the invention. For
pouring it in by hand, and each container is pref
example, long rollers might be used as a substitute
erably provided with a baiiie 32 to prevent the rip
for some of the sets of individual rollers. Pref
ple from reaching the strips or ribbons of metal
erably, the apparatus is substantially or practi
or other suitable material.
cally vertical, so that the tape or ribbons travel
Preferably, the multiple spool may be lifted
upwardly and then downwardly. This makes for
vout whenbit becomes entirely loaded with the 65 a practically minimum amount of ?oor space
coated strips or ribbons of metal, so that the said
necessary for the machine or apparatus, but it is
strips may then be removed and cut into sec
conceivable that the tape or ribbons could be
tions of desired length for Venetian blind slats, or made to travel horizontally instead of vertically,
for other purposes.
by using _a different relative arrangement of the
In'actual'practice, of course, it becomes desir 70 elements of the machine or apparatus.
able to keep the tape or ribbons from vibrating
"as. they emerge and rise out of the paint or
enamel in the containers. This can be done in
any suitable or desired manner, as for example,
.byproviding a couple of plates 34 and 35, be
An important thing to observe is that while
the coating is done by a dipping process, it is
true that the motion of the article or thing‘being
dipped is never reversed in the paint bath, as it
75 travels through the latter by continuous motion
‘2,404,000
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and without-any. interruption or reversal thereof.
~theobjeot to be‘coated travels'continu
.used for curving the ‘dry/coated: material ‘trans
versely, so :that his slightlyitrougheshaped ‘in
.ously. in: one .direction ‘and it ‘rises ‘so slowly outzof
cross :section, and that any’ suitable means can be
thepaint or enamelbath,*that the liquid. is spread
evenlyanduniformly in a thin ?lmover thesur
employed for cutting the strips into lengths suit
ablefor'the Venetian‘blinds, and that this cut
faces .of'the metalror other'material, and this
?lm‘of ‘liquid is not disturbed by anyjoltingor
tingoperationican be‘performed before or even
jarring or vibration of the 'strip or ribbon 'of
in :cross section.
after the strip or'ribbon is'permanently curved
'
metal, with the result that whenéthe'coatedtape
Thus;the;dipping process for coating the sheet
.or'strip is ?nally wound on'the .reel 33, the ?lm 10 steel or other suitable material becomes con
(of enamel orpaint isperfectly smooth and uni
tinuous, in e?ect, ‘instead of'being intermittent
formv in‘ thickness, and completely dry. Things of
as itwould‘be if .the material was cut intofsuita
this'kind can be coated by’spraying the painter
blexlengths and :thereafter dipped and ‘coated.
enamel on :them, but there are many :diii‘iculties
The enamel, paint or iotherlliquid material em
and objections involved in .spraying which “are 15 ployedshould’be of 'any well known kind that
completely eliminated .or obviated .by a dipping
is toughilandi'ipliable,‘ 'when'dried; so that the form
process of .theikind ‘ishovmiandsdescribe'd. :‘For
ing.'of the strips WillInOt crack or injure the coat
example, spraying ' oftnarrow orfsmall articles »or
ing .thereon.
objects is usually' accompanied by ‘a serious waste
The foregoing'isra description of the ‘apparatus
of lthewliquidmaterial, whereas with the dipping 20 in "what might :be ‘called its simplestform, as
process shown ‘and described, there‘is absolutely
suming that the ‘strips Jor‘ribbons are allimovi'ng
no vwaste-of the painter enamel. In ‘addition,
spraying involves the atomiz'ing of the liquid, and
simultaneously, ‘fromfsupplyireels that‘are all‘on '
if ‘the latter contains a idrier of one kind or an
a1l1on another shaft.
other, the ?ne particles of'the liquid may become
too :hard before they strike ‘.the surface 'of the
article to be coated. With the ‘multiple reels
shown and described, the plurality of strips or
ribbons ‘can be coated simultaneously, each with
l'Howeven'iin actual‘ practice; it is found :prefer
able‘tohave the-supply reels ‘operating separately
the storage reels upon'which' thei'coate'd-Istrips or
ribbons‘ are‘woun'd’ialso foperatin‘g ~separately and
a diiferent color or shade, and thisis possible
independently of each‘other, whereby theiamount
one ‘shaft, .and ?nally'tofstorage‘reels that are
‘
and independently eof . each ‘other, and to have
without :increasing ‘the height of the machine.
The tape 'or ribbon is kepttaut ‘and held against
of 'windior coiled-up strip or ribbon maybe con
siderably differentfonithe ‘different reels or drums,
distortiomwith the one exception that it is Imo
or on the‘spools‘a's theyimay be‘calle'd.
'
mentarily curved in "cross section immediately
i-‘For'that purpose,ithere are'then as many sup
before .it emerges from the surface of the liquid,
ply "reels 1'! as there ‘are stripjsor ribbonsyor’as
and this ‘slight ‘momentary distortion tends to
there are'p'aint or enamel containers "for‘holcling
prevent vibration of the‘strip ‘or ribbon,'~which is
theiliquid. A1S0,ifor that purpose, there'are as
desirable inasmuch as‘vibration-mi'ght disturb the
many .istorage reels or drums 33 as there ‘are
?lmpf'liqui'd‘on the ribbon. But with‘vthe‘flatter
strips ‘or ribbons, or as there are liquid containers.
held against any vibration, ‘the ?lm is of uni 40 That means that‘ there are as many band'brakesx
form thickness and is absolutely stable, so that it
It as there are ‘supply reels or drums on'the axis
dries 'oribakes in ‘a perfectly ‘smooth condition
2. ‘The separate and independent storage reels
and with a glossy surface that is entirely free
33 practically ?oat on the roller 24 and the roller
from roughness or unevenness. Therefore, if‘the
39, which latter is merely an idler, the roller '24
strip :or ribbon is ‘run atl‘too high a speed, it will
being driven at a higher speed than the feed, in
carry vupfan'excess 'of liquid that will then run
order to keep the strips or ribbons taut on the
back down 'and'streak the surface ‘of the film.
reels 33, and this compensates for the di?erence
But when the ribbonis' runat such-a slow rate ‘of
in‘spee'd of ‘the ‘tape or ribbon when it begi'ns‘to
speed ‘that it carries upward no excess‘liquid, a
windiup on 'a reel, ‘and its speed when the‘ reel
thin'?lm' is insured of uniform thickness‘and with 50 is nearly full. As shown more ‘clearly in ‘Fig.9,
no unevenness of the surface thereof.
the ‘framing 40 has some transversechannel irons
It-will be observed that while thestrip- or rib
M and '42 thereon,‘ provided with pins 43 that
bon with the ?lm of paint or enamel thereon
keep the reels 33 properly separated‘and upright
is moving in one ‘direction, the heated air is
on the rolls‘2‘4 and '39. In this way, the supply
moving, in the voppositedirection, inasmuch as
reéls and the ‘storage reels “can be used in'dif
the said tape or ribbon moves upwardly in the
ferent ways, and one reel ‘can be running a ‘small
oven 8, while the heated air in the latter moves
job while another reel is running a large job, and
downwardly. SIn 'thisway, any given spot on
other things can be done, quite obviously, that
the strip or ribbonis subjected to steady and
could not be done 'if all the supply reels were
changing ‘supply of :heated air, during its course
rigid'with each other, and if all the storage reels
oftravel throughthe oven. In this way, the strip
were'rigid with each other. Of course, the‘speed
or ribbon encounters the minimum temperature
of all‘theistrips or ribbons is maintained at a cer
when it enters the lower end of the oven, and
tain predetermined degree by the ?xed speed of
then encounters the maximum temperature-when
the roll I I, and its idler roll 22, which are main
it entersthe upper portion of the oven. This, of - tained at a predetermined given speed inorder to
course, means the upwardly travelingportion of
insure the proper timing of the apparatus, not
the tape or ribbon, for while the latter ultimately
only as to the timing of thestrips or ribbons in
passes-outside of the oven and through the or
the bath, but also in the‘ oven. Obviously, there
dinary atmosphere, and then downwardly a dis
must be no disturbance that would .cause ripple
tance within the oven, it will be seen that the
in the bath, and thelength of time that the
greater course vor distance of travel is upwardly
within the oven.
‘If the several strips or. ribbons are being coated
to become the slats of Venetian blinds-it is ob
Vi'ous that a suitable or desired means can be
strips or ribbons are in the oven, orbeing dried
and hardened, must be predetermined to insure
the. proper drying andahardening of the. thin?lm
of liquid material 'on .the ‘strips or ribbons. _:It
75
will alsobeseenthat there are preferably as many
2,404,000
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springs 23, and spring-pressed rollers 22, as there
travel of said metal ribbon, through which slot
the metal ribbon passes, the said means having
the arcuate slot therein being located within said
container for the coating composition a short
distance below the upper surface of the coating
composition in said container whereby the coated
metal ribbon has a temporary arcuate form
transversely of its length as it leaves the body of
are ribbons or strips to be coated, for it is better
to have the feeding grip individual for each strip
or ribbon, for in that way there is compensation
for any difference in thickness as between the
strips or ribbons, and the machine may be work
ingssimultaneously on both relatively thick and
relatively thin strips or ribbons, and at this junc
coating composition.
ture it is to be observed that there are as many
friction brakes I6 as there are rolls 15, in the 10
4. An apparatus as described in claim 3 fur
preferred form of the apparatus.
Of course, the timing and temperatures men~
tioned are merely those that have been found to
be proper for a, particular enamel which has been
used for coating the strips. Of course, some 15
enamel is baked at a temperature as high as six
‘hundred degrees Fahrenheit, and all the other
conditions depend more or less on the type of
material used, for some enamels or paints dry
ther characterized in that the arcuate slot is
formed between a pair of members having coop
erating arcuate surfaces, one of said members
being ?xed and the other being yieldably pressed
against said ?xed member with sufiicient force to
give said coated metal ribbon said temporary
arcuate form transversely of its length as it leaves
the body of the coating composition.
5. An apparatus for continuously coating a
20 metal ribbon with a liquid coating composition
and bake quickly while others require more time,
and hence the distance of travel and the tem
perature of the elements and other factors of
that kind will vary according to the type of mate
rial used. The invention, therefore, is not limited
to any particular temperature or timing or length 25
which comprises a container for the liquid coat
ing composition, means for passing the metal rib
bon through the liquid in said container at a slow
even speed, whereby to uniformly coat the metal
ribbon with a thin smooth ?lm of the coating
composition, said means for passing the metal
of travel, as that will vary more or less in accord
ance with different conditions.
What I claim as my invention:
ribbon including a roller driven at a slow even
guide means associated with said oven for mov-'
under tension.
ing the coated ribbon from the container for the
coating composition upwardly through the oven,
6. An apparatus for continuously coating a
metal ribbon with a liquid. coating composition
which comprises ‘a container for the liquid coat
ing composition, means for guiding the metal rib
bon into and out of the liquid in the container at
a slow even speed, whereby to uniformly coat the
metal ribbon with a thin smooth ?lm of the coat
ing composition and means for preventingvibra
tion of the coated metal ribbon as it leaves the
body'of liquid coating composition in said con
tainer including means having a slot therein
which slot is arcuate transversely of the line of
travel of said metal ribbon, through which slot
the metal ribbon passes, the said means having
the arcuate slot therein being located adjacent
the upper surface of the coating composition in
said container whereby the coated metal ribbon
has a temporary arcuate form transversely of its
length as it leaves the body ‘of coating composi
speed engaging the metal ribbon after the coat
ing is applied and drawing the metal ribbon
1. An apparatus for continuously coating a
metal ribbon with a liquid coating composition 30 through the coating bath at said slow even speed
and said means for passing the metal ribbon also
which comprises a container for the liquid coat
including a supply reel and a second driven roller
ing composition, the largest dimension of which
having a uniform peripheral speed slightly less
container is many timesesmaller than the length
than that of said’ ?rstnamed roller and posi
of the metal ribbon, means for continuously guid
tioned at a place in the path of travel of said
ingv the metal ribbon into and out of, the liquid
metal ribbon between said supply reel and said
in the container at a slow even speed whereby
containerLthe metal ribbon being maintained in
to uniformly coat the metal ribbon with a thin
engagement with said second driven roller by
smooth ?lm of the coating composition and
means resiliently urging said metal ribbon against
means for continuously drying the ?lm of coating
said second driven roller whereby the portion of
composition so formed on the metal ribbon, said
metal ribbon extending between said second driv
drying means including an oven supplied with
en roller and said ?rst driven roller is placed
heated air moving downwardly therethrough and
then for a short distance outside the oven, and
do
then downwardly again inside the oven and then
again out of the oven by a movement laterally
therefrom at a point located a substantial dis
tance above the lower end of the oven.
2. An apparatus for continuously coating a 50
metal ribbon with a liquid coating composition
which comprises a container for the liquid coat
ing composition, means for guiding the metal
ribbon into and out of the liquid in the container
at a slow even speed, whereby to uniformly coat
the metal ribbon with a thin smooth ?lm of the
coating composition, and means located adjacent
the surface of said liquid in said container for
providing the ribbon with an arcuate form trans
versely of its length as it leaves the body of coat
ing composition in said container whereby to pre
vent vibration of the coated metal ribbon as it
leaves said body.
‘
3. An apparatus for continuously coating a
metal ribbon with a liquid coating composition
which comprises a container for the liquid coat
ing composition, means for guiding the metal rib
bon into and out of the liquid in the container at
a slow even speed, whereby to uniformly coat the
metal ribbon with a thin smooth ?lm of the coat
ing composition, and means for preventing vibra-.
tion of the coated metal ribbon as it leaves the
body of liquid coating composition in said con
tainer including means having a slot therein
which slot is arcuate transversely'of the line of
GU
tion.
‘7. In a method of making short lengths of
coated metal ribbon permanently set in an arcu
ate form transversely of their length the step
which comprises ?rst continuously coating a rela
tively long ribbon of the metal before subdividing
said metal into lengths and before providing said
permanent arcuate set, said coating being applied
by continuously guiding the ribbon of the metal
into and continuously drawing said ribbon ver
tically upwardly out of a body of liquid coating
composition in a container at a slow even speed,
providing said ribbon with an arcuate form
2,404,000
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transversely'bf its length over a portion of its
path of travel extending from a point a substan
tial distance within the body of liquid coating
therein which slot is arcuate transversely of the
line of travel of said metal ribbon, through which
slot the metal ribbon passes, the said means hav
composition to a point a substantial distance be
ing the arcuate slot being located adjacent the
upper surface of the coating composition in said
container whereby the coated metal ribbon has a
temporary arcuate form transversely of its length
as it leaves the body of coating composition.
yond where said ribbon leaves the ‘body of liquid
coating composition and continuously drying the
?lm of coating composition so formed on the long
metal ribbon, said coating composition being
maintained at uniform temperature and uniform
composition during the coating operation.
8. A method for continuously coating a metal
ribbon with a liquid coating composition which
comprises guiding the metal ribbon into and
drawing said ribbon vertically upwardly out of a
body of the liquid coating composition at a slow
even speed and providing the metal ribbon with
10. A method for continuously coating a metal
10 ribbon with a liquid coating composition which
an arcuate form transversely of its length over
a portion of its path of travel extending from a
point a substantial distance Within the body of
liquid coating composition to a point a substan
comprises guiding the metal ribbon into and out
of a body of liquid coating composition at a slow
even speed and providing the metal ribbon with
an arcuate form transversely of its length over a
portion of its path of travel extending from a
point a substantial distance within the body of
liquid coating composition to a point a substan
tial distance beyond where the metal ribbon
leaves the body of coating ‘composition.
11. A method for continuously coating a metal
tial distance ‘beyond where the metal ribbon 20 ribbon with a liquid coating composition which
leaves the body of liquid coating composition.
comprises continuously guiding the metal ribbon
9. An apparatus for continuously coating a
into and drawing said ribbon vertically upwardly
metal ribbon with a liquid coating composition
out of a body of the liquid coating composition
which comprises a container for the liquid coat
in a ‘container at a slow even speed, providing the
ing composition, means for maintaining the coat 25 metal ribbon with an arcuate form transversely
ing composition in said container at a uniform
temperature throughout the coating operation,
of its length over a portion of its path of travel
extending from a point a substantial distance
within the body of liquid coating composition to
tically upwardly out of the liquid in the con
a point a substantial distance beyond where the
tainer at a slow even speed, whereby to uniformly 30 metal ribbon leaves the body of coating composi
coat the metal ribbon with a thin smooth ?lm of
tion and continuously drying the ?lm of coating
the coating composition and means for prevent
composition so formed on the metal ribbon, said
ing vibration of the coated metal ribbon as it
coating composition being maintained at uniform
means for guiding the metal ribbon into and ver
leaves the body of liquid coating composition in
said container including means having a slot 35
temperature during the coating operation.
GLENN L. SHERWOOD.
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