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Патент USA US2410851

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Nov. 12, 1946.
' Filed March 27, 1944
S Sheets-Sheet 1
Nov. 12, 1946.
Filed March 27, 1944
5 Sheets-Sheet 2
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Patented Nov. 12, .1946 .
2,410,851’ . '
l : GRAIN nnnvmm'ron
Albert B. Welt-y,’ Moline, 111., assignor to Interna
tional Harvester Company, a ' corporation ‘of
New Jersey.
Application March 27, 1944, Serial No. 528,254
1 China (Cl. 263-19)
present invention will become apparent from the
following speci?cation and accompanying draw‘
ings, in which:
An important object of the present invention
- Figure 1 is a perspective view of the portabl
grain dehydrator of this invention;
Figure 2 is an end view of the device as shown _
is to provide .a portable graindryer which may
1 be readily moved to any desired position.
Another important object of this invention is
in Figure 1;
the provision of a corn dryer, wherein a quantity
of corn is so treated that the greater percentage
Figure 3 is a sectional view taken on the line
3—3 of Figure 1;
of moisture is removed therefrom.“
Storing of corn without spoilage is a big prob
Figure 4 is a sectional view taken on the line
4-4 of Figure 3 ; and
Figure 5 is a skeleton perspective view of the -
lem to the individual farmer as well as to- those
persons.- operating grain elevators.
vOther and further important objects of ‘the
This invention relates to a new and improved
grain dehydrator and has for one of its principal
objects the provision of, novel means for drying‘
quantities of grain preliminary to storage.
When the
‘device indicating heat circulation with arrows.
corn is picked, the kernels usually contain a high 15 ,“The' reference numeral Ill indicates generally
percentage of moisture.’
a chassis or frame upon which is mounted a body -
If such corn were im- ,
mediately shelled from the cobs and- stored in a
H. ‘The frame is carriedby wheels I2. ‘The for
tight grain bin, spoilage would begin promptly.‘ ' ward end of the frame I0 is equipped with a hitch
It has been found by experience that‘if the high
l3 which maybe attached to and drawn‘ by a
moisture content ‘of this shelled corn‘ were re-‘ 20 tractor or the like. It is obvious that this _grain_
duced to 14% or less, it could'be safely stored
dehydrator is portable and maybe moved from
in a regular grain bin for an inde?nite period of
bin to bin of. an individual farmer, as his needs 7'
require. or may be moved to other farms for use. _
time without danger of spoilage. Heretofore, it
has been impossible for an individual farmer-45o
purchase equipment to dry shelled corn. There
fore, rather than shell the corn immediately
Howeverywhen the grain dryer is in operation,
after it has been picked, the corn would be left »
on the cobs and placed in‘ open corn cribs, so that
air could‘ circulate through and cause natural
drying of the corn.
process, however, re-' 30
it is desired to have it remain quite stationary
and to this end leg members II are supplied.
These legs M’ are of the extension type, and al
though they are mounted rigidly at If: on the
body I I, they may be extended or retracted by
means of~an adjustment l6.
' V
quired considerable time, and although there
was not much danger of spoilage because the
The travel of shelled corn through the grain
dryer requires several mechanical devices and a
' kernels were all opened to the atmosphere, losses
plurality of'elevator‘s, and to effect an operation
did occur. These losses were chie?y caused by
rodents or other small animals nesting in the
com bins. The danger of fire with the corn in
this condition was excessive and also contributed
of these units an engine. I‘! is'provided. One of
the main functions of the engine is to drive a
- fan I8 as shown in Figure 4.
As best shownin
Figure 1, the internal combustion engine I ‘I im
parts rotation to the pulley IS on the crank-shaft
'20. It is, ‘of course, understood that power for
means for drivingv the'moisture out of corn and 40 the grain dryer operating units may be obtained
may therefore safely‘ buy shelled corn which has
from other means than an internal combustion
a high moisture content. The price of high mois
engine such as an electric motor, a, steam engine,
ture corn per bushel is much less than the price -_ or the like. A pulleyj2l is mounted on the fan
of "dried” corn per' bushel. It is quite advan
shaft‘ 22 and is operatively joined‘ to the pulley
tageous to corn growers to sell their corn when 45
I! by means of a belt 23.
it is dry ‘rather than accept the low price for
to the losses.
Operators of grain elevators employ arti?cial
moist com.
A heating unit, shown at 24, is provided on the
It is, therefore, an important ‘object of this in; ‘. frame III to supply the arti?cial heat needed to
drive the moisture from the kernels of grain.
vention to provide an arti?cial means for dry
ing corn for use by all, that is, the individual 50 The heater 24, shown here, is an voil burner type,
and it is obvious that any type of furnace or
fa;mer, a group of farmers, or the operator of
heater could be employed and still secure the de-‘
a grain elevator. ‘
v I
sired dehydration ‘results. A fuel oil tank is
A still further important object of this inven
shown at 25 for feeding fuel to the oil burner 26.
tion is to provide an automatic economically op
erating device for drying shelled corn.
55 A motor 21, preferably driven by electricity from
a power-line 28, drives a pump- within the hous
Figure 3 is a cross-sectional view of the chamber
42 of the grain'dryer. As the grain discharges
from the pipe 31, it forms a central ridge directly
beneath the pipe 31 and from there it tapers
downwardly as shown by the lines 68. In opera
tion, the chamber 42 is entirely ?lled with kernels
of corn, and it is the object of this device to heat
this column of corn in the ‘chamber 42 and then
ing 29.
As best shown in Figure-2, supply hopper 3! may
be ?lled by any means such as the trough 32 shown
here coming from a large receptacle 33. The hop
per 3| is substantially V-shaped and is equipped
with an auger lying parallel to the vertex. 'The
auger (not shown) is‘ adapted to feed the grain
discharge it from the bottom thereof, whereupon .
to one end of the hopper‘where it communicates
with a supply elevator 34. The grain is then lifted 10 it is cooled and then stored. The slope of the up
per surfaces of the corn as designated by the lines
to the top 35 of the elevator 34, and, as best shown
59 is, substantially parallel with lines drawn
in Figure 1, discharges kernels of corn into a hop
per-like member 36. A pipe 31 extends longitudi
through the heat entrances. The heat entrances,
nally of the body II and is attached at one end to
as shown at 60, 6|, 62, 63, 64, and 65, are in the
the hopper 36 at 38, as shown in Figure 1. 15 upper portions of three plenum chambers 66, 61,
and 68. These three plenum chambers are main
In the pipe 31 is housed an auger 40 which pro
tained with a supply of hot air. The heat en
jects within the hopper 36, as shown in Figure 4,
trances 60, 6|, and 62 are in a line substantially
‘ and extends the entire length of the pipe 31. The
,parallel with the inclined surface 59 directly
auger 40 is equipped with a central shaft 4|
which extends beyond the ‘hopper 36 and beyond 20 above, and similarly, the heat entrances 63, 64,
and 65 are substantially parallel with the corn
surface line directly above them. As the corn
the other end of the pipe 31. As the kernels of
com are fed to the hopper 36, they are carried
by the rotating auger 46 :through‘the pipe 31. '
The holes 319, in the bottom of the pipe, permit the
corn to drop through into the chamber 42 within 25
the body ||. The corn will continue to drop
through this successive series of holes until suchv
time as the column formed therebeneath supplies
sufficient back pressure to cause the corn to travel _
to the end of the pipe 31. Any surplus of corn
that does reach the end of the pipe will return
through the conduit 31* to the supply recep
enters the chamber 42, through the openings 39
and the pipe 31,.it is generally cold and rela
tively moist. As heat is driven upwardly from the
plenum chambers 66, 61, and 68, it causes drying
of the com. The height of the column of grain
in the chamber 42 is predetermined so that the
major portion of the heat is utilized. In other
words, by the time the heated air has passed
through the column of grain it is’ substantially
saturated and approximately at' room tempera
ture. The top of the grain drying chamber is open
and the air after passing through the column of
Referring now to Figure 1, it will be seen
that a pulley (not shown) on the fan-shaft 22 35 grain is discharged through the open top.v It is“
obvious that at different levels within the cham
drives a belt 44, which in turn drives a pulley 45
ber 42, the corn will be at di?erent temperatures.
mounted on a shaft 46. An idler pulley 4.1 is
tacle 3|.
mounted on the end of a bell-crank 48 which is
. As the corn progresses downwardly, it gets hotter
and dryer. The parallelism between the upper
pivoted at 49 and which has a handle portion 50
swingable on the arcuate member 5|. In the posi 40 surface of the corn and the heat entrances is for
the purpose of effecting a-uniformed heating ‘of
tion shown, the idler pulley 41 has so tightened the
, the corn over the entire width of the dryer.
belt 44 that it effects a drive between the fan
Grain discharge rolls 68 are positioned ad
shaft 22 and the shaft 46. However, if the handle‘
jacent the lower portions of each plenum cham50 of the bell-crank 48 were swung in a right
ward or counterclockwise direction, viewing the 45 her. One of these rolls is shown in greater de
tail in Figure 4. It will be seen that the periph
device as in Figure l, the idler pulley 41 would
ery of the rolls is provided with intermittent
be withdrawn from contact with the belt 44 and
so permit rotation of the shaft 22 without re
' pockets 10 so that at no place around the roll is
there a continuous icuteout portion, or is there
sulting rotation of the shaft 46. Figure 3 shows
‘an enlarged view of the pulley 45 and its shaft 50 a continuous cut-out portion from one end of
the roll to the other. The pockets 10 are offset
46. From this view it is seen that a bevel pinion
bot'n around and longitudinally of the rolls 69.
gear 41’, keyed or otherwise fastened to the end
Returning to Figure 3, it will be obvious that the
of shaft 46, cooperates with a large bevel gear 48’
which is keyed or otherwise fastened to the auger
kernels of corn will ?ll the pockets 10, and upon
shaft 4|. From this arrangement of pulleys and 55 rotation of the rolls 63 will permit a discharge
of the'kemels at the point 1| at the bottom of
gears, ‘it will be understood that the engine |1
the rolls. The size and number of pockets in
effects a driving of the fan | 8, the auger 40, in
addition to supplying a continuously rotating end
the rolls are such that the corn is removed at
'43’ of the auger shaft 4|. This rotating end 43'
substantially the same rate at which it is fed
is best shown in Figures 1, 2, and 4, and in Fig-' .60 ' to the device whereby the hopper is maintained
ures 1 and 2 it is evident that a pulley 50' is keyedgi, . substantially ?lled and always presents a uni
or otherwise fastened to this rotating shaft
form column of grain of the desired altitude.
end 49'.
Partitions 12 are attached to the sides of the sev
Several pulleys, namely, 5| ', 52, and 53, are in a
eral plenum chambers and, in cooperation with
common plane with the pulley 56' and are joined 65 similar partitions 13, provide a trough with an
together by means, of a crossed belt 54. The
opening in the bottom thereof for feeding di
pulley 5|’ is mounted on shaft 55 and directly
rectly to the pockets 10 within the rolls 69. Fur
drives the grain supply elevator 34. The pulley
V ther, the rolls 69 are partially surrounded with
52 is mounted on shaft 56 and imparts a drive to
a covering material‘ 14, such as canvas, leather,
a grain discharge elevator 51. The pulley 53. is 70 rubber, or possibly synthetic rubbers.) These
an idler tightener pulley and is mounted on a
covers 14 are in two sections and are fastened
directly or indirectly at 15 and 16 to the par
The chamber 42 is rectangular in shape and is
titions 12 and 13, respectively. The lower ends
well insulated from the atmosphere‘by thickly in
of the covers 14 areequipped with rods 11 and
sulated walls 43 as shown in Figures 3 and 4 75 18 which are yieldably held together by a spring
stub-shaft 58.
. or the like (not shown). The space "H between
- the rods ‘ll and ‘i8 is to permit the discharge of
kernels. The covers ‘id snugly engage the'an
a circular segment and is pivoted on the shaft
I00. The vertex "36 of the segment M5
justably positioned within the slotted bracket
101. The outer arcuate end of the segment Hi5
is'adapted to coincide with the arcuate periph
cry of the ratchet wheel i?i. The pawl “it, as
nular peripheries of the rolls 69 and so prevent
to ‘a great degree the passage of hot air from
the chamber 52 to a chamber ‘i9 beneath the
plenum chambers. Conversely, cold air in the
chamber 19 is prevented from assingr upwardly
into the grain column chamber 2,.
shown in Figure 2, is thus prevented from con
tacting the ratchet teeth and'movement of the
ratchet wheel iill is thereby delayed until the
At the time the corn kernels are discharged at 10 pawl iM passes beyond the upper limit of the
the spaces ‘ii beneath the rolls 89, they are very
hot and if stored in that condition would tend
to take on considerable surface condensation
with the result that the corn would be in no bet
ter condition for storing than before dehydration.
-_ It is, therefore, necessary to provide means for
bringing the temperature of the corn down after
it has been heated and dried preliminary to stor
ing. The chamber 19 includes a COOlillg means.
The corn from all four of the rolls‘ 89 is dropped 20
on to a cross-conveyor 89 which extends sub
segment I05. The segment Hi5 maytbe pivoted
about its center I50 and ?xed in any desired '
position within the slotted bracket ill‘? to effect
any rate of ratchet rotation that-is permissible
between thelimits of movement of the pitman
91. A second pawl “18 is resiliently held against
the bottom of the ratchet wheel lot by means
of a spring "19.. This ratchet wheel prevents
rearward or counter-clockwise rotation of the '
ratchet'wheel IUI when the pawl we no longer
is engaged with the ratchet teeth. A chain H0 is
wrapped around each of the sprockets 95 as well
as the sprocket Hi2, an idler sprocket Hi, and
stantially across the width of the grain dryer.
This conveyer 86 is preferably of the canvas type
and extends around end rolls 8i and 82 which
the sprocket H2; The sprocket H2 is mounted
have centralshafts 83 and M, respectively. Slat‘ 25 on the shaft 84 which is a continuation of the
members 85, preferably of wood, run longitudi
shaft for the roll 82 of the cross-conveyor 86.
nally of the entire grain dryer and transversely
From this it will be evident that ‘drive from the
pulley 50 through the pawl IN to the ratchet
of the conveyor 80 and are attached to the con
veyer 89 at regular intervals therearound. The
wheel llii imparts rotation to the rolls 89 as well
slats 85 are equipped with outwardly extending 30 as the conveyor 80. The idler sprocket iii is
nail-like projections 86. These nails extend
mounted on a stub shaft H3 and merely per
along the entire surface of each .slat, as best . forms the function of maintaining the chain
shown in Figure 4.
As previously stated, the oil burner throws a ‘
The conveyor Bil is driven in a clockwise di
rection, as viewed in Figured, and all grain dis-‘ 35 fuel oil through the tube 30 into a furnace lid
charged by the rolls 5t will be carried around the
which has a dome-like structure 1 55 within which .
end 82 and dropped on a corrugated bottom 87.
combustion takes place: The fan id, as shown in
This corrugated bottom 81 is best shown in Fig
Figure 4, is adapted to take air_ in at H6 and
ure 4 and includes peaks 88 and depressions 89.
supply it with a high. velocity so that it is pro
The nail-like projections 8'6 are adapted to‘ 40 jected downwardly through the opening HT di- 1
project downwardly within the depressions 89,
rectly above the dome H5. The air then passes
and as the kernels of corn are dropped on to
over the furnace dome and down around beneath
the chamber 42 as indicated by the arrows. The
hot air enters the endsof the plenum chambers
the bottom 91 at the point 98, the kernels are
carried substantially individually across this cor
rugated bottom 81 within the depressions 89.
The kernels are discharged at the point 9! closely
66, El, and B8 and escapes upwardly through the
screen passageways 8!, 62, 63, 6d, and 65, where
adjacent a discharge auger 92 so that the grain '
coming down an inclined surface 93 isfed rear
wardly to the point where it joins the grain dis
charge elevator 51.
The rolls $9 have central shaft 96 journaled in
upon it continues its upward movement through
the column of corn thus performing the dehy
drating action.v ~A portion of the air used for the
50 fan intake H6 is not taken directly from the
atmosphere but shown in Figure 3 is .
the housing ‘which project rearwardly beyond
‘drawn in through an entrance H8 in the bottom
the housing ii asshown in the Figure 2 rear
of the housing and passes beneath the corru
view. Each shaft 95 has a sprocket 95 keyed or
gated bottom Bl of the cooling chamber ‘F9. The
55 air thus drawn in is within a chamber Ht be-v
otherwise fastened thereto.
It is a requirement of this grain dehydrator
tween the bottom plate i20 and the corrugated
that the discharge rolls 59 rotate very slowly and
partition 81. The kernels of corn are passing
to that end a particular drive is employed. The
individually along the corrugations within the
pulley 50' is equipped with a crank pin 96 to which
depressions 89, thus transferring heat from the
is attached a pitman at. It will be evident that 60, dehydrated corn to the incoming air. .This per
as the pulley 56' rotates, the pitman at will re
forms two functions: (1)‘ that of cooling the fin
ciprocate vertically. The lower end of the pit
ished corn and (2) that of preheating the in- .
man is attached at 98 to an arm 99 which is piv- -
coming air to be used in the dehydrating process.
oted on a shaft 809. A ratchet wheel it! is
As best shown in Figure 5, after the incoming
mounted on this shaft I88 and carries with it a 65 air has traversed the chamber H9, it enters a
sprocket I02 in a common plane with the sprock
substantially triangularly shaped chamber i2!
ets 95. The arm 99 is equipped with a projec
which carries it along the side of the grain dryer 7
tion wt to which is pivoted a pawl wt for engage
housing and thence upwardly through the con—
ment with the ratchet wheel ilil. As the pit
duit E22 where it is drawn into the fan l8 by
man 91 is lifted upwardly, the pawl HM engag 70 means of the suction created by the fan. From
ing the ratchet teeth causes the ratchet wheel
this description, it is seen that the air that ‘is
it! to rotate in a clockwise direction as viewed
inthe device of Figure 2. The effective move
used to directly contact the corn is free from con
tamination with any exhaust gases inasmuch as
merit of the pawl we may be curtailed by the ' the furnace H4; is sealed from the chamber I28
member Edd. This member “it is in the form of 75 surrounding the furnace. ,
storage bin.
The exhaust gases formed after combustion of
The testing for moisture may be
g the oil within the furnace II4 pass upwardly
done inseveral ways. The subject grain dryer
through the dome II5 into the conduit I24, then
downwardly into the cylindrical conduit I25
is adapted to employ a mechanical means to test
for moisture content and to that end a pulley I40
is fastened to the shaft 56 and by means of a
belt “I acts to cause rotation of the pulley I42
which operates a grain testing device (not
shown). An idler pulley I43 maintains tension
'which causes the hot exhaust gases to progress
circularly and upwardly in the manner indicated
by the arrows. It will be obvious that the gases
are required to travel through one-half of the
cylindrical conduit I25 where it progresses up
wardly into a second section I25 of the cylin
in the belt MI. The details of the moisture test
ing device, indicated at I44 and driven by the
pulley I42, is shown in greater detail in my co-'
pending application having Serial No. 528,255
and filed March 27, 1944.
drical conduit, whereupon it proceeds back
around another half revolution and then-up t0
the third and top section I21 of the cylindrical
conduit. This is shown in great detail in Figures
4 and 5; This circulation of exhaust gases con
Numerous details of construction may be va
15 ried throughout a. wide range without departing
from the principles disclosed herein. The sub-,
tributes greatly to the heating of the chamber
ject device has been described as a corn dryer
I23, thus utilizing more of the combustion heat
when in fact it may be used successfully for dry
produced by the oil burner 24 or by any type of
ing other smaller grains with but slight changes
fuel or furnace that may be employed. The
exhaust gases continue travel upwardly'as ‘at I28 20 in the structures.
The intention therefore is only to limit the in
into a second set of heat transfer conduits which
vention within the scope of the appended claims.
surrounds the fan I8. This also contributes high
What is claimed is:
operating e?iciency by the utilization of all heat
1. In a grain dehydrator, a grain chamber,
available. The exhaust gases enter the vertical
means for moving grain from the top to the bot
column I29 and pass through numerous tubes
tom of said chamber,‘ a heating compartment, a
I30 where they congregate in a second vertical
furnace within said compartment, 9. fan for blow
column i3I and are discharged into a horizontal
ing air downwardly over said furnace and up
tubular memberv I32. This tubular member I32
through the grain chamber, and means for utiliz
is positioned directly beneath the feed pipe 37
ing exhaust gases from the furnace to preheat
and is buried within the column of corn in the
the incoming air, said nieans comprising coils
chamber 42. Here again the exhaust gases are
of enclosed conduits positioned around said fan.
utilized to their maximum capacities and con
2. A grain dryer comprising a grain chamber,
tribute greatly in preheating the columnof corn
feed device at the top of said grain cham
in the chamber 62. The tubular member I32 is
superposed by an outer tubular member I33. The 35 ber, a grain discharge device at the bottom of
said chamber, a heating compartment adjacent
end of the member I33 is secured to the end wall
said grain chamber, a sealed furnace within said
of the grain dryer at I34. As exhaust gases cool,
heating compartment, a discharge conduit for
they tend to condense, and it is therefore neces
exhaust furnace gases, said discharge conduit
sary to provide a drain for such condensation.
taking a circuitous‘ path around said heating
The bottom of the tubular member I33 is U
compartment, and fan means for blowing air
shaped as shown at I35. This lower U-shaped
downwardly through said heating compartment
portion of the tube-I33 tapers downwardly to
and up through the, grain chamber, a continua
ward the rear of the grain drying machine, and
tion of said discharge conduit circling the fan
at its end communicates with a drain pipe lat}
which projects through the insulated wall lit.
3. A grain dryer comprising a grain chamber,
The tube I32 terminates at a point short of the
a grain feed device at the top of said grain
end wall, thus permitting the flue gases to come
a grain discharge device at the bottom
out into the outer tubular member I33 where
of said chamber, a heating compartment adja
upon they are caused to return by contact with
cent said grain chamber, a sealed furnace within
the end wall 43 and pass the length of the tube
said heating compartment, a discharge conduit
I33, whereupon they are discharged by means of
exhaust furnace gases, said discharge con
an exhaust fan at I31.
duit taking a circuitous path around said heat
Heat created by the oil burning unit 213 is
ing compartment. fan means for blowing air
utilized. The in-take air is preheated. The heat
downwardly through said heating compartment
ed air which emerges, from the column of grain
up'through the grain chamber, a continua
from the chamber 42 is substantially room tem
tion of said discharge conduit circling the fan
per‘ature, and the combustion gases pass through
means, and a conduit extending longitudinally
numerous heat transfer devices so that the entire
through the grain chamber near the top thereof,
grain dehydrator circulation has attained its
said conduit joining with the discharge conduit
maximum ef?ciency.
for exhaust furnace ‘gases whereby complete uti
The grain discharge elevator 51 connects with
. two discharge spouts I38 and I33. A valve (not
shown) can be operated to cause discharging of
corn to either of these spouts‘lll or I39. The
spout I33, however, discharges into the bin as’
which is the supply for the corn to begin its
travel through the grain dehydrator. At inter
lization of furnace heat is accomplished.
4. In a grain dryer, 9. grain chamber, means
for maintaining said grain chamber constantly
?lled, said means comprising a means for feeding
grain at the top of said chamber and means for
removing grain from the bottom of the chamber,
said last named means comprising an endless
vals in the operation of this grain dehydrator,
belt conveyer beneath said grain chamber adapted
the moisture content of the discharged kernels is
carrythe grain to its discharge end, a corru
tested and, if the content is above some predeter 70 to
gated partition beneath and projecting beyond
mined percentage, then- the grain is diverted to
the discharge end of said conveyer and adapted
the spout I38 where it is again dried. If, how
to receive the grain from the conveyer, projec
ever, the moisture content is low enough to have
tions on said belt conveyer on its under side
good storing qualities, then the grain is dis
charged through the spout I39 to some desired 75 adapted to run through said corrugations whereby
the grain deposited on the corrugated partition
is carried in the opposite direction by said pro
jections through said corrugations, a bottomvb'e
neath and spaced apart from said corrugated
partition, and means for drawing air through
space between the corrugated shelf and the bottom
for preheating air for the air circulating means
and simultaneously cooling the grain in its dis
charge over the corrugated shelf.
6. A grain dryer comprising a grain chamber,
the space between the corrugated partition and
means for feeding grain to the top of said cham
the bottom for preheating the air preliminary
ber and means for removing grain from the bot
to its circulation through the grain chamber, and
tom of said chamber, a furnace adjacent said
simultaneously cooling the grain in its travel
grain chamber, a discharge conduit for furnace
through the corrugations.
10 combustion gases extending longitudinally of said
5. In a grain dryer, a grain chamber, means
grain chamber immediately beneath the top
for feeding grain at the top of said chamber
thereof, a superposed return conduit for said
and means for discharging grain from the bottom
longitudinally extending discharge conduit, and
of the chamber, an endless band conveyer be
means for exhausting the combustion gases.
neath said grain chamber discharge means, said 15
'7. A grain dryer comprising a grain chamber,
endless band conveyer adapted to carry the grain
means for feeding grain to the top of said cham
to one side of the grain chamber, a corrugated
bar and means for removing grain irom the bot
shelf spaced beneath said conveyer and adapted
to receive grain from said endless band conveyer,
a grain chamber, a’ discharge conduit for furnace
tomof said chamber, a furnace adjacent said
on the return of the endless band on its under 20 combustion gases extending longitudinally of said
side, projectionson said endless band conveyer
adapted to run through said corrugations whereby
the grain is carried in the opposite direction by
said projections over said corrugations, air-circu
lating means for said grain chamber, a bottom 26
beneath and spaced apart from said corrugated
shelf, and means for drawing air through the
grain chamber immediately beneath the top
thereof, a superposed return conduit for said
longitudinally extending discharge conduit, means
for exhausting the combustion gases, and‘ a con
densate drain for said superposed return conduit. -
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