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Nov. 26, 19467
|. J. 'OVE'RMAN
' 2,411,751
~DRIER FOR AGGREGATES AND THE LIKE
Filed July 1 , 1943
WV
_
. INVENTOR.
2,411,751
Patented Nov. 26, 1946
UNITED‘ STATES PATENT OFFICE
2,411,751
DRIER FOR AGGREGATES AND THE LIKE
Ivan J. Overman, Marion, Ind.
Application July 1, 1943, Serial No. 492,984
18 Claims. (Cl. 263-16)
1
This invention relates to driers for aggregates
and the like.
This invention is an improvement upon the
. drier illustrated, described and claimed in Pat
2
inner drum has a tapered intake throat portion
15. The end wall I6 of the drum structure is
stationary. The discharge end of tube l2 pro
jects into the central aperture in the end l6 de
?ned by collar lea and into the intake end l5
ent No. 2,290,765, dated July 21, 1942. In actual
as illustrated.
use of this patented structure two serious operat
The inner drum includes a main frusto-con
ing objections were discovered.’ The ?rst was,
ical
body portion 11, which is a continuation of
.if the aggregate was quite moist, the resulting
intake portion l5. An outer cylindrical drum l8
drying
stage
did
not
have
free
vapor in the intial
10 envelopes the inner drum and its right hand
escape but worked back and interfered with the
end, see Fig. 1, has a close ?t with rim l6b of
second drying stage. The second was more seri
closure I6. Annular rings 19 and 28 are carried
ous and potentially dangerous. The resulting
by the inner and outer drums interiorly and ex
back pressure, as it were, frequently quenched
teriorly, respectively, and suitably connected to
one of the ?ames. The combustible mixture then
gether by bolts, etc., 2|. In this manner the in
accumulated in the drier until it accidentallyig
ner drum is supported within and by the outer
The
result
was
an
,
nited from the other ?ame.
drum with a channel therebetween.
explosion of detonating andpotentially devastat
ing character.
,,
The chief object of the present invention is
Within the inner drum and secured to the in
terior thereof and co-extensive with portion I1
thereof are the annularly spaced ?ights or vanes
I to insure proper drying in bothstages andmore 20 22. These are pitched about 15° and six are uti
particularly to insure that one ?ame will always
. lized. These ?ights are spaced apart to some
ignite the combustible mixture from the unlit
torch before such mixture can accumulate in the
drier to such a degree as to be dangerous. I
The chief feature of the present invention con
sists in first stage ventingand inclusion of ig
nition tubes in the drier.
,
c
what delay aggregate travel so that aggregate
travels longitudinally, both interiorly and exte
25 riorly, notwithstanding the difference in drum
diameters, and is substantially atequal rates and
equal to the feeding rate of screw l3.
Secured to the interior of the exterior drum
I8 are four ?ights of annularly spaced vanes 23,
.Other objects and features of the present in
vention will be set forth more fully hereinafter.
there being six in each ?ight and each pitched
The full nature of the invention will be under 30 about 45°. Drum rotation is in the direction of
stood from the accompanying drawing. and the
the arrow, see Fig. 2, and. the speed is about 10
7 following speci?cation and claims:
R. P. M.
The exterior of drum I8 is provided with the
Fig. l is side elevation of a drier embodying
bearing bands 24 and these in general are sub
35
the invention, the outer housing such as illus
stantially as illustrated in Figs. 1 and 2 of said
trated in said patent, if used, being omitted.
patent and as so illustrated one set of rollers 25
Fig. 2 is an elevational View of the aggregate
herein is smooth and the other set 26 is grooved.
supply and discharge end of the drier, the hous
The power for shafts H is omitted for clearness.
ing being omitted.
The intake end of the drum structure has its
In the present form of the invention, like the 40 stationary end, It apertured at 21, which aper
aforesaid patent, the aggregate is supplied to and
ture is the aggregate outlet of the drum struc
discharged from the same end of the drier. ‘Dif
ture. End I6 is also apertured at 28 positioned
fering from said patent, the moisture, burned a slightly to the left of the centralplane in Fig. 2.
the
end
opposite
that
I gases, etc., discharge from
Adjacent said aperture 28 is a burner 29 ported
last mentioned. This has certain operational 45 at 30 and having nozzle 31 connected by an air
advantages.
‘
line 32 to a source of air pressure and by fuel
Herein It indicates framework that may be
line 33, including valve 34, to a source of oil or
casedto form a housing as aforesaid. It also
gas under pressure. ‘
'
the hopper ll leading to stationary sup
' supports
This burner directs its ?ame into the drum
ply passage l2 in which is mounted aggregate 50 structure throughaperture 28 and within the
efeed screw 13 carried by shaft l4 rotatable by
annular channel between the inner and outer
suitable means not shown.
7
drums. The other end of the inner drum is open
The screw feeds the aggregate in a regulated
and terminates short of the adjacent end of the
manner and degree’ into the rotatable drum
outer drum which carries an annular inwardly
55
structure and into the inner drum thereof. This
In the drawing _
.
,
3
2,411,751
directed shield 35 providing a large central open
ing. Carried by the frame I0 is a stationary
plate 36, apertured at 3'! and having an inwardly
and downwardly directed deflector 39 at its upper
edge which is slightly above the drum axis of
rotation.
_
’
A similar burner 45!, ported at M and having
rangement at the “closed” ends of the inner
drum and annular chamber, so that the proper
vapor and gaseous flow for the proper discharge
thereof will occur.
The temperature of the inner drum chamber
is appreciably higher than that in the outer an
nular chamber. The aggregate when discharged
is dry and at about 260° to 300° F. If the collar
Mia is appreciably larger than screw feed tube
nozzle 1&2 connected to a source of air pressure
by line 43 and a source of oil or gas under pres
sure by line lid including valve 45, directs its 10 Hi 2, hot gases will escape about said tube and heat
flame through opening 31 and into the inner
same and thus preheat the aggregate in the worm
drum near the bottom thereof.
tube creating a vapor pressure therein to seal,
The aggregate is supplied in regulated amount
as it were, the inner drum at the intake end.
and continuously by screw l3 from hopper H to
the inner drum at the intake end. It is rotated
by the blades 22 in drum rotation and is gradu
ally worked to the left hand end'of same, thus
discharging to the other drum. Anylaggregate
discharged outwardly and from the inner drum
This accounts for the interior of the inner drum
being at a higher temperature than the outer
annular chamber.
While the invention has been illustrated and
described in great detail in the drawing and fore
going description, the same is to be considered as
illustrative and not restrictive in character.
The several modi?cations described herein as
well as others which will readily suggest them
selves to persons skilled in this art, all are con
sidered to be Within the broad scope of the in
engages de?ector 39 and is returned to the outer
drum. Any aggregate that falls down at this
end and ‘from the outer drum is also so returned
by the bai?e. The outer drum vanes, in drum
rotation, work the aggregate back to the supply
end until it is discharged through outlet 27.
25 vention, reference being had to the appended
Burner 48 also is oif-center and to a greater
claims.
~
degree than burner 29 and is at a higher eleva
The invention ‘claimed is:
tion than the latter. The ?ame from burner 48
1. An aggregate'drier comprising in combina
passes into the inner drum and passes toward
tion a rotatable drum structure including an in
the aggregate intake end thereof. Moisture in 30 ner drum and an outer drum through which ag
the aggregate is vaporized and rises in the drum
gregate passes in succession, a stationary clo
with the hot products of combustion. “The screw
sure for one end of said drum structure having
feed blocks escape from closure it, so the afore
apertures through which aggregate is supplied to
said rises and returns and ?nally passes out
the inner drum, and aggregate is discharged
through the central aperture in ring ?ange 35
from the outer drum, a burner arranged to flame
and above plate at and de?ector ‘39.
the interior of the outer drum and through a
The ?ame from burner 29, entering at 23,
closure aperture therein, a stationary partial clo
passes along the drum structure in the annular
sure at the opposite end of the drum structure,
channel betweenthe inner and outer drums and
the central inner drum chamber and included
‘finally discharges inwardly at the plate 35 and 40 outer
annular chamber venting therefrom above
similarly escapes from the drum structure. The
the latter closure, the inner drum at the said
housing, not shown, may include a ‘stack to facili
opposite end of the structure terminating short
tate such discharge.
of the adjacent end of the outer drum for ag
The foregoing arrangement, accordingly, pre
gregate transfer, said latter closure having an
vents the development of moisture excessive back 45 aperture therein, and a second burner ?aming
pressure in the drum, since substantially no re
vthe interior of the inner drum through the last
strictions are included preventing, or materially
mentioned aperture.
retarding continuous flow and escape of vapor
2. An aggregate drier comprising in combina
ized moisture and products of combustion through
tion a rotatable drum structure including an in
and from the drum structure.
vner drum and an outer drum through which
Reference will'again be had to Fig. 1 wherein
aggregate ‘passes in succession, a stationary clo
there is illustrated ‘a plurality of tubes fed, open
sure for one end of said drum structure having
at opposite ends and projecting through the in
apertures through which aggregate is supplied
take end of the inner drum substantially at the
to the inner drum, and aggregate is discharged
junction between portions i5 and I1 thereof. 55 from the outer drum, a burner arranged to ?ame
These tubes, of which two are herein illustrated
the interior of the outer drum and through a
at 180°, have their lesser divergent ends closest
closure aperture therein, a stationary partial clo
sure at the opposite end of the drum structure,
cessively register therewith. The greater diver
the central inner drum chamber and included
gent ends of said tubes are closest to burner 25:‘ 60 outer annular chamber venting therefrom above
and positioned so that said ends successively
the latter closure, ‘the inner drum at the said
register therewith.
.
'
opposite end of the structure terminating vshort
‘Thus there is always restricted communication
of the adjacent end of the outer drum for aggre~
' between'the inner drum chamber and the outer
gate transfer, said latter closure having an aper
annular channel. Furthermore, in drum rota‘ 65 ture therein, and a second burner flaming the
tion, at least every three seconds (10 R. P. M.
interior of the inner drum through the last men
times 2), a tube is aligned, as it were, between "tioned aperture, and wherein the inwardly di
nozzles 29 and 48. Now if the burner ?ame,
rected burners are at di?erent elevations and
accidentally or intentionally, goes out for either
oifset laterally of the drum structure Vertical
‘burner, the ?ame from the other burner will 70 central plane.
‘ignite the unlighted combustible mixture, and
3. An aggregate drier comprising in combina
‘before a dangerous concentration thereof builds _ tion a rotatable drum structure including an
up in the drum. Accordingly, danger of ‘destruc
inner drum and an outer drum through which
tive explosions is completely eliminated. These
aggregate passes in succession, a stationary clo
‘two tubes ‘also provide a pressure equalizing ar
sure - for one end of said >- drum~ structure- having
to burner 40 and positioned so that said ends suc
serial-aperture therein; a stationary partial clo
sure at -the-opposite-end of the drum structure,
‘the ‘central inner drum chamber and included
apertur'es "through ‘which aggregate-is supplied
to 'the'inner' drum, "and/aggregate is discharged
from the outer drum,‘ a burner arranged to ?ame
outer-annular chamber venting therefrom above
the interior ‘of ' the’ outer ' ‘drum'and through --a
the-"latter closure, the inner drum at the said
closure 'a‘perturetherein‘,"'a'v stationary partial clo
opposite end of the structure terminatingishort
of’the adjacent end’ of the outer drum for aggre
gate transfer, ‘said latter closurefhaving an aper
sure ‘at 'theopposite end of the drum" structure,
the central inner "drum chamber “and included
outer‘r-annular ‘chamber ventingrtherefrom above
the ‘latter closure; the - inner "drum at the-said ‘
opposite end of ‘the ‘structure terminating" short
mentioned aperture, and wherein the inner drum '
‘of the-‘adjacent end of the-outer'drumfor-aggree
gate transfer, said latter‘closure 'having'an- apere
ture-therein, and “a second burner ‘?aming-the
‘interior ofthe innerdrum-through the" last men
tioned aperture,- ‘ and wherein they inwardly -di—
ture therein, and a second burner ?aming the
interior of the inner drum through the last
15
rected burners -'~ are at different -- elevations.w and
offset laterally ‘of the drum structure vertical
central plane and‘inwardly- directed-?ange means
;on the end of ' theeouter ‘drums-‘opposite the intake
end of the 'drum'lstructureyand' spaced longitudi
nally of the'adja'cent end-of the inner drum and
‘havingsaminner edge that-is ‘at a greater radial
distance from the drum rotation axis than the
burner adjacentthat end of drum structure --is
spaced from the aforesaid axis for non-interfer- 1
‘ing ?aming by the last mentioned burner of the
'drumstructure» central“ chamber and aggregate
transfer from the inner to -the~outer drum. '
‘4; "An aggregate drier comprising ‘in combina
tion- 3a‘ ‘rotatable drum "structure ‘including "an
~»i-nner drum and "anouter <drum~ through which
aggregatepasses in succession, a stationary clo
sure for one -end ‘of said drum structure having
apertures through which aggregate is supplied
to the inner drum, and aggregate is discharged
from the outer-drum, a burner arranged to ?ame
‘the interior of the outer *drum and through'a
closure aperture therein, aistationary ‘partial ‘clo
sure at the opposite end of the drum structure,
‘the central Iinnen drum - chamber and“ included
outer annular chamber venting therefrom above
the latterclosure, the-inner" drum at the said
~opp'os-ite1end *of the ‘structure terminating ‘short
is of tapering type with its smallest end con
stituting the aggregate intake of the structure,
andprotector tube means ‘extending angularly
through the inner drum adjacent the intake
en'd'thereof, the end of said tube means closest
to the intake end of the structure being at a,
greater distance from the structure axis of ro
tation than the opposite end of the said tube
means.
7
.
I
‘
6-. An aggregate drier comprising in combina
tion a rotatable drum structure including an in
ner drum and an outer drum through which ag
gregate passes in succession, a stationary closure
_for one end of said drum structure having aper
tures through which aggregate is supplied to the
inner drum, and aggregate is discharged from the
outer drum, aburner arranged to ?ame the inte
rim" of the outer drum and through a‘ closure
aperture therein, a stationary partial closure at
~the‘opposite-end of the drum. structure, the cen
tral inner drum chamber and included outer an
nular chamber venting therefrom above the lat
ter Iclosurethe inner drum at the said opposite
end of the structure terminating short of the ad
jace'nt end of the outer drum for aggregate trans
fer, vsaid latter closure having an aperture there
in, and a second burner ?aming the interior of
the inner drum through the last mentioned aperg
ture," and wherein the inner drum is of tapering
"type with its smallest end constituting the aggre
gate'intake of the structure, and protector tube
‘means extending angularly through the inner
drum adjacent the intake end thereof, the end
voftheadjacent endof the'outer drum for aggre
P “of ‘said tube means closest to the intake end of the
gate transfensaid latter closure having an aper
structure being at a ‘greater distance from the
ture- therein; vand‘a ‘second‘burner ?aming the
structure axis of rotation than the opposite end
interior of the vinner “drum through the last
of
the said tube means,vthe burners being at dif
~mentioned aperture, and wherein the inwardly
‘ferent elevations, the intake end‘burner being at
‘directed burners are at different elevations- and
"offset laterally‘of the drum structure vertical 50 a greater distance from the structure axis of ro
"tation. '
central plane and inwardly directed ?ange means
7. An ‘aggregate drier comprising incombina
on the end'of the-outer drum‘opposite the intake
‘Ition
a rotatable drum structure includingan in
end'of the drum structure, and spaced longi
ner drum‘ and an outer drum through which ag
tudinally of the adjacent end ‘of ‘the innerdrum
and having an inner edge that is ‘at a greater . 'gregate passes insuccession, a stationary closure
radial distance from the drum rotation axis‘ than
the '-‘burner "adjacent that ‘end of drum'structure
‘is spaced ‘from the aforesaid axis ‘for non-inter
ier-ingi?aming by the last mentioned burner of -
for one end of said drum structure having ‘aper-v
fture's' through which aggregate is supplied to the
inner drum,’ and aggregate is'discharged from the
outer drum, a=burner arranged to flame the in
the drum structure central {chamber and aggre 60 terior ofthe outer drum and through a closure
"aperture therein, a stationary partial closure at
gate transfer from the inner to the outer‘drum,
the opposite end of the drum structure, the cen
the ‘secondmentioned partial ‘closure at its‘ up
tral inner drum chamber ‘and included outer an
per edge having an ‘inwardlyv'and downwardly
nular
chamber venting therefrom above the lat
directed (de?ector 'forthe- purpose set forth and
terminating at its ‘lower inner edge above the 65 ter closure, the inner drum at the said opposite
end of ‘the structure terminating short of the ad
?ame path from said ‘last mentioned burner.
jacent end of the outer drum for aggregate trans
/ ‘5. An aggregate drier comprising incombina
fer, said latter closure having an aperture there
tion a rotatable drum structure'including an in
in, and a second vburner ?aming the interior of
ner-drum and an outer drum through which ag
gregate passes in succession, a-stationary closure 70 ‘the inner drum through the last mentioned aper
~ ture,v and wherein‘ the inner drum is of tapering
for one end of said drum structure having aper
type with its smallest end constituting,r vthe ag
ftures through which aggregate is supplied to ‘the
gregate vintake of the structure, and protector
inner drum, and aggregate is discharged from
vtube y'i'meain'sr extending angularly through the
the outer drum, -a ‘burner arranged to ?ame the
"interior of the outer-idrumvand-through a- -clo-" 75 "inner drum adjacent the intake'end thereofg'the
amen
'7
,
end of said tube, means closestto the intake end
of the structure being at a greater distance from
the structure axis of rotation than the opposite
end of the said tube means, the burners being at
di?erent elevations, the intake end burner being
at a greater distance from the structure axis of
rotation, the inner drum end of the ‘tube means
being distant from said axis substantially the
distance from the same that the second men
tioned burner is therefrom.’
,
8. ,An aggregate drier comprising in combina
being distant from said axis substantially the
distance iruni'tne same that the second men
tioned Dul‘llbl'is“lentil-U111, tne outer ul-uin end
01 the tune means being distant iroill the said
axis slightly less than the distance lronl tne same
that the met mentioned burner is tnei'eirom.
1.0. ml aggregate urler comprising in combina
tion a rotatable uruin structure including an
inner drum and an outer urum through which
10 aggregate passes in succession, a stationary clo
sure ror one end of said drum structure having
tion a rotatable drum structure including an in
apertures through which aggregate is supplied
ner drum and an outer drum through which ag
to the inner drum, and aggregate is discharged
gregate passes in succession, a stationary closure
from the outer drum, a burner arranged to name
for one end of said drum-structure having aper 15 tne interior of tile outer drum and through a
tures through which aggregate is supplied to the
closure aperture therein, a stationary partial
inner drum, and aggregate is discharged from the
closure at the opposite end of tne orum structure,
outer drum, a burner arranged to ?ame the in
the central inner drum chamber and included
terior of the outer drum and through a closure
outer annular chamber venting therelrom above
aperture therein, a stationary partial closure at 20 the latter closure, the inner drum at the said
the opposite end of the drum structure, the cen
opposite end of the structure terminating short
tral inner drum chamber and included outer an
or the adJacent end of the outer drum ior aggre
nular chamber venting therefrom above the lat
gate transfer, said latter closure having an aper
ter closure, the inner drum at the said opposite
ture therein, and a second burner naming the
end of the structure terminating short of the ad 25 interior of the inner drum through the last men
jacent end of the outer drum for aggregate trans
tioned-aperture, and wherein tne inner drum is
fer, said latter closure having an aperture there
of taperingr type with its smallest end constitut
in, and a second burner ?aming the interior of
ing the aggregate intake or tne structure, and
the inner drum through the last mentioned aper
protector tube means extending angularly
ture, and wherein the inner drum is of tapering 30 through the inner drum adJacent the intake end
type with its smallest end constituting the aggre
thereof, the end of said tube means closest to the
gate intake of the structure, and protector tube
intake end of the structure being at a greater dis
means extending angularly through the inner
tance from the structure axis of rotation than
drum adjacent the intake end thereof, the end of
the opposite end of the said tube means, the
said tube means closest to the intake end of the 35 burners being at vdifferent elevations, the intake
structure being at a greater distance from the
end burner being at a greater distance from the
structure axis of rotation than the opposite end
structure axis of rotation, both burners being
of the said tube means, the burners being at dif
o?set laterally of the central vertical plane of the
ferent elevations, the intake end burner being at
drum structure.
,
a greater distance from the structure axis of ro 10
>11. Anaggregate drier comprising in combina
tation, the outer drum end of the tube means be
tion a rotatable drum-structureincluding an in
ing distant from the said axis slightly less than
ner drum and an outer drum through which ag
the distance from the same that the ?rst men
gregate passes in succession, a stationary closure
tioned burner is therefrom.
for one end of said drum'structure having aper
9. An aggregate drier comprising in combina 45 tures through which aggregate is supplied to the
tion a rotatable drum structure including an
inner drum, and, aggregate is discharged from the
inner drum and an outer drum through which
outer drum, a burner arranged to ?ame the in
aggregate passes in succession, a stationary clo
terior of the outer drum and through a closure
sure for one end of said drum structure having
aperture therein, a stationary partial closure at
apertures through which aggregate is supplied to
the opposite end of the drum structure, the cen
the inner drum, and aggregate is discharged from
tral inner drum chamber and included outer an
the outer drum, a burner arranged to ?ame the
nular chamber venting therefrom above the lat
interior of the outer drum and through a closure
ter closure, the inner drum at the said opposite
‘aperture therein, a stationary partial closure at
end of the structure terminating short of the ad
the opposite end of the drum structure, the cen- ' jacent end of theouter drum for aggregate trans
tral inner drum chamber and included outer an
fer, said latter closure havingan aperture-there
nular chamber venting therefrom above the lat
in, and a second burner ?aming the interior of
ter closure, the inner drum at the said opposite
the inner drum through the last mentioned ap
end of the structure terminating short of the ad
erture, and wherein the,inner drum is of taper
jacent end of the outer drum for aggregate trans
ing type with its smallest end constituting the ag
fer, said latter closure having an aperture there
gregate intake of the structure, and protector
in, and a second burner ?aming the interior of
tube means extending angularly through the in
the inner drum through the last mentioned ap
ner drum-adjacent the intake end thereof, the
erture, and wherein the inner drum is of taper
end of said tube means closest to the intake end
ing type with its smallest end constituting the 65 of the structure being at a greater distance from
aggregate intake of the structure, and protector
the structure axis of rotation than the opposite
tube means extending angularly through the in
end of the said tube means, the burners being at
ner drum adjacent the intake end thereof, the
different elevations, the intake end burner being
end of said tube means closest to the intake end
at a greater distance from the structure axis of
of the structure being at a greater distance from 70 rotation, both burners being offset laterally of
the structure axis of rotation than the opposite
the central vertical plane of the drum structure,
end of the said tube means, the burners being at
the intake end burner being laterally offset to a
different elevations, the intake end burner being
, lesser degree. '
at a greater distance from the structure axis of
' 12. An aggregate drier comprising in combina
’ rotation, the inner drum end of-the tube means 75 tion a rotatable drum structure including an in
' 2,411,751
10
tures through which aggregate is supplied to the
inner drum, and aggregate is discharged from the
ner urumrand-‘an router drum‘through which ag
gregate passes in succession, a stationary closure
outer :dru'm, a burner arranged to flame the'in
for one end. of said ‘drum structure having aper
terior of the outer drum and through a closure
tures through which aggregate is supplied to the
aperture therein, a stationary partial closure at
inner drum, and aggregate isdischarged from the
the opposite end ‘of’ the drum structure, the cen
outer drum, a burner arranged to flame thein
tral inner drum chamber and included outer an
terior 0f the :outer drum and through a closure
nular chamber venting therefrom above the lat
aperture therein, a stationary partial closure at
ter closure, the inner drum at the said opposite
the opposite end of the drumv structure,_the cen
end of the structure terminating short of the ad
10
tral inner drum chamber and included outer an
jace-nt‘end of the outer drum for aggregate trans
nular chamber venting therefrom above the lat
fer, said latter closure having an aperture there
ter closure, ‘the inner drum at the said opposite
in,;and a second burner ?aming the interior of
end of the structure terminating short of the ad
vthe;im'ierdrum through the last mentioned aper
jacent end of the outer drum for aggregate trans
ture, and wherein the inner drum is of tapering
fer, said latter'closure having an aperture there 15 type with its smallest end constituting the aggre
.in, and a second burner ?aming the interior of
gate intake of the structure, and protector tube
the inner drum through the last mentioned aper
means ‘extending angularly through the inner
ture, ‘and wherein the inner drum is of tapering
drum adjacent the intake end thereof, the ‘end
typewith its smallest end constituting the aggre
of sai'd‘tube means closest to the intake end 'of
gate intake of the structure, and protector tube 20 the structure being at a greater distance from the
means extending angularly through the inner
structure axis of rotation than the opposite end of
drum adjacent the intake end thereof, the end of
the said tube means, the burners being at differ‘
said tube means closest to the intake end of the
structure being at a greater distance from the
ent elevations, the intake end burner being at a
greater distance :rrom the structure axis of rota
structure axis of rotation than the opposite end 325 tion, both burners being offset laterally of the
of the said tube means, the burners being at dif
central. vertical plane of the drum structure. the
ferent elevations, the intake end burnerbeing at
inner ‘drum end of the tube means being distant
a greater distance from the structure axis of ro
from said axis substantially the distance from
tation, both burners being offset laterally of the
‘the same that the second mentioned burner is
central vertical plane of the drum structure, the 30 therefrom, the outer drum ‘end of the tube means
inner drum end of the tube means being distant
being distant from the said axis slightly less than
from said axis substantially the distance from
the distance from the same that the ?rst men
thesame that the second mentioned burner ‘is
tioned, burner is therefrom.
therefrom.
‘
'15.‘ ‘An aggregate drier comprising in combina
13. An aggregate drier comprising in combina 35 tion a rotatable drum structure including an in
tion a rotatable drum structure including an in
ner drum and .an outer drum through which ag
gregate passes in succession, a stationary closure
for one end of said drum structure having aper
ner drum and'an outer drum- through which 'a'g
gregate passes
succession, a stationary closure
for one end of said drum structure having aper
outer drum_ a burner arranged to ?ame the in
terior of the outer drum and through a closure
aperture therein, a stationary partial closure at
the opposite end of the drum structure, the cen
tral inner drum chamber and included outer an
nular chamber venting therefrom above the lat
ter closure, the inner drum ‘at the said opposite
end of the structure terminating short of the ad
interior of the outer drum and through a closure
aperture therein, a stationary partial closure at
tures through which ‘aggregate is supplied to the
tures through which aggregate is supplied to the 40 inner drum, and aggregate is discharged from
inner drum, and aggregate is discharged from the
the outer drum, a burner arranged to ?ame the
the opposite end of the drum structure, the cen
tral inner drum chamber and included 'outeran
nular chamber venting‘ therefrom above the lat
ter 'clo'sure, the inner drum at the said opposite
‘end of the ‘structure ‘terminating short of the ad
ja‘cent end of the outer drum for aggregate trans“
~50
jacent end of the outer drum for aggregate trans
"fer,
said latter closure having an aperture there
fer, said latter closure having an aperture there
‘in, and a second‘ burner flaming the interior‘ of
in, and a second burner ?aming the interior of
the inner drum through the last mentioned aper
the inner drum through the last mentioned aper
ture, and wherein the inner drum is of tapering
ture, and wherein the inner drum is of tapering
type with its‘smallest end constituting the aggre
type with its smallest end constituting the aggre 55 gate intake‘ of the structure, and protector tube
gate intake of the structure, and protector tube
means extending angularly through the inner
means extending angularly through the inner
drum adjacent the intake end thereof, the end of
drum adjacent the intake end thereof, the end of
said tube means closest to the intake end of the
said tube means closest to the intake end of the
structure being at a greater distance from the
structure axis of rotation than the opposite end
of the said tube means, the burners being at dif
ferent elevations, the intake end burner being at
a greater distance from the structure axis of ro
structure being at a greater distance from the
structure axis of rotation than the opposite end
of the said tube means, the burners being at dif
ferent elevations, the intake end burner being at
a greater distance from the structure axis of ro
tation, both burners being offset laterally of the
tation, both burners being offset laterally of the 65 central vertical plane of the drum structure, the
central vertical plane of the drum structure, the
intake end burner being laterally offset to a lesser
outer drum end of the tube means being distant
degree, the inner drum end of the tube means
from the said axis slightly less than the distance
being distant from said axis substantially the
from the same that the ?rst mentioned burner is
distance from the same that the second men
70
therefrom;
~
14. An aggregate drier comprising in combina
tion a rotatable drum structure including an in
ner drum and an outer drum through which ag
gregate passes in succession, a stationary closure
for one end of said drum structure having aper
tioned burner is therefrom.
16. An aggregate drier comprising in combina
tion a rotatable drum structure including an in
ner drum and an outer drum through which ag
gregate' passes in succession, a stationary closure
11
2,411,751
for one end of said drum structure having aper
tures through which aggregate is supplied to the
inner drum, and aggregate is discharged from the
outer drum, a burner arranged to ?ame the in
terior of the outer drum and through a closure
aperture therein, a stationary partial closure at
the opposite end of the drum structure, the cen
tral inner drum chamber and included outer an
nular chamber venting therefrom above the lat
ter closure, the inner drum at the said opposite 10
end of the structure terminating short of the ad
J'acent end of the outer drum for aggregate trans
fer, said latter closure having an aperture there
in, and a second burner ?aming the interior of
the inner drum through the last mentioned aper 15
ture, and wherein the inner drum is of tapering
type with its smallest end constituting the aggre
gate intake of the structure, and protector tube
means extending angularly through the inner
drum adjacent the intake end thereof, the end of 20
said tube means closest to the intake end of the
structure being at a greater distance from the
structure axis of rotation than the opposite end
of ‘the said tube means, the burners being at dif
ierent elevations, the intake end burner being at 25
a greater distance from the structure axis of ro
tation, both burners being offset laterally of the
central vertical plane of the drum structure, the
intake end burner being laterally offset to a less
er degree, the outer drum end of the tube means
ner drum adjacent the intake end thereof, the
end of said tube means closest to the intake end
of the structure being at a greater distance from
1e structure axis of rotation tnan the opposite
end of the said tube means, the burners being at
di?erent elevations, the intake end burner being
at a greater distance from the structure axis of
rotation, both burners being offset laterally of
the central vertical plane of the drum structure,
the intake end burner being laterally offset to a
lesser degree, the inner drum end of the tube
means being distant from said axis substantially
the distance from the same that the second men
tioned burner is therefrom, the outer drum end
of the tube means being distant from the said axis
slightly less than the distance from the same
that the ?rst mentioned burner is therefrom.
18. An aggregate drier comprising in combina
tion a rotatable drum structure including an in
ner drum and an outer drum through which ag
gregate passes in succession, a stationary closure
for one end of said drum structure having aper
tures through which aggregate is supplied to the
inner drum, and aggregate is discharged from
the outer drum, a burner arranged to flame the
interior of the outer drum and through a closure
aperture therein, a stationary partial closure at
the opposite end of the drum structure, the cen
tral inner drum chamber and included outer an
being distant from the said axis slightly less than 30 nular chamber venting therefrom above the lat
ter closure, the inner drum at the said opposite
the distance from the same that the ?rst men
end of the structure terminating short of the ad
tioned burner is therefrom.
jacent end of the outer drum for aggregate trans
fer, said latter closure having an aperture there
35 in, and a second burner ?aming the interior of
the inner drum through the last mentioned aper
gregate passes in succession, a stationary closure
ture, and wherein there is provided a feed screw
for one end of said drum structure having aper
device for aggregate supply, the axis of which is
tures through which aggregate is supplied to the
coincident
with the drum structure rotation axis,
inner drum, and aggregate is discharged from the
the screw device adjacent end portion of the in
outer drum, a burner arranged to ?ame the in
ner drum being appreciably tapered and the re
terior of the outer drum and through a closure
mainder of the inner drum being of frusto-coni
aperture therein, a stationary partial closure at
cal type, the opposite end of the inner drum ter
the opposite end of the drum structure, the cen
minating adjacent but slightly spaced from the
tral inner drum chamber and included outer an 45
outer drum, the latter being substantially cylin
nular chamber venting therefrom above the lat
drical
and longer than the-inner drum at the said
ter closure, the inner drum at the said opposite
opposite end thereof and wherein the inner drum
end of the structure terminating short of the ad
is of tapering type with its smallest end con
jacent end of the outer drum for aggregate trans
fer, said latter closure having an aperture there V50 stituting the aggregate intake of the structure,
and protector tube ,means exending angularly
in, and a second burner ?aming the interior of
through the inner drum adjacent the intake end
the inner drumthrough the last mentioned aper
thereof, the end of said tube means closest to the
ture, and wherein the inner drum is of tapering
intake end of the structure being at a greater
type with its smallest end constituting the ag
distance from the structure axis of rotation than
gregate intake of the structure, and protector
tube means extending angularly through the in 55 the opposite end of the said tube means.
IVAN J. OVERMAN.
17. An aggregate drier comprising in combina
tion a rotatable drum structure including an in
ner drum and an outer drum through which ag
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