Патент USA US2040994

May 19,1936.
2,040,994
C. B. HOAK
ANNEALING FURNACE
Filed June 11, 1935
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May 19, 1936.
c. B. HOAK
2,040,994
ANNEALING FURNACE
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Filed June 11, 1935
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Inventor
A Homey
May 19, 1936.
V
C_ B_ HOAK
2,040,994
ANNEALING FURNACE
Filed June 11, 1955
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Ínvenlor
By
A Homey
2,040,994
Patented. May. `19, 1936
vUNITED sTATEs PATENT OFFICE
-Appl!catiolxrïêilîínll., lîëlñjzîîi-asl) No. 26,049
My invention relates generally to an anneal
ing furnace especially adapted to the heat treat
ing of sheet steel and tin, and particularly to a
furnace of this type which applies >uniform heat
5 to the top, bottom and sides of the material be
ing treated.
'
Another importantl object of my invention is
to provide an annealing'furnace of the charac
ter indicated above in which oxidizing of the
10 material being treated is positively obviated.
Another important object of my invention is
to provide an annealing furnace of the charac
ter indicated above in which conservation of and
effective use of heat and fuel is attained to an
15 unusual degree.
-
Other important objects of my invention will
be apparent from a reading of the following de
scription in connection with the drawings,
wherein for purposes of illustration I have
20 shown a preferred embodiment of my invention.
In the drawings:-
-
'
Figure 1 is an elevational view vof the complete
furnace.
Figure 2 is a transverse vertical sectional view
25 through the furnace showing covers and stands
used for holding tin plate while the same is be
ing annealed in the'furnace.
Figure 3 is a horizontal sectional view taken
on the line 3-3 of Figure 2, but with the covers
1
30 removed from the bases 9.
Figure 4 is a section taken approximately on
the line 4--4 of Figure 2, but with the bases and
-‘ covers omitted, the section being taken through
the cover only.
35
resisting character` and includes the vertical side
walls III, and the closed top which is integral
with the upper edges thereof. The side walls
are provided with suitably connected vertical T’s
I2A which taper outwardly and have their widest 5
ends at the lower end of the cover and on a level
with the lower end of the cover so as to engage
the top of the base 9 and furnish’extra support
for the side walls, and thereby assist in prevent
ing warping of the side walls which would other- 10
Wise take place- and cause leaks tinto the interior
of -the cover which would militate against per
fect sealing ofthe sheets within the cover.
Attached to the outer edge of the T’s is the
vvertical fence I2' which has its‘lower edge on 15
a level with the lower edge of the T’s and the `
lower edge of the side walls. 'This fence is pro
vided as a means to hold sand I_I’ in position
on the base 9 and in proper sealing relation to
the lower end of the cover; It will be understood 20
that the sand is so arranged that upon slight
warping of the lower edge of the cover the sand
will act as an automatic seal to prevent leaks
into the interior of the cover. The same con
struction of cover is utilized if, instead of the, 25
two covers shown in the drawings, a single large'
cover, especially in annealing steel plates, is uti
llzed.
.
'
.
.
It will be observed that the achievement of
heating the material on all four sides at a uni- 30
form temperature greatly speeds up the process
of annealing and produces a material having a
more uniform grain, and all ‘of this isaccom
plished at a corresponding saving in fuel over
‘
Figure 5 is a perspective vi`ew of one of thel
fuel distributing tile.
present equipment.
.
35
The cover 5 comprises the outer shell Il of
Figure 6 is a' perspective view of a plate of
material
, Figure to
7 is
beatreated.
fragmentary perspective view of
a corner of the lower part bfV one of the stand
covers.
~
`
.
,
steel, lined with insulating material I5 of suit
able character. The fuel directing tile I8 may
be of carborundum tile or of suitable alloy steel
of high heat resisting quality. The top of the 40
tile is beveled as indicated by the numeral I‘I
to fit the `interior of the insulating material I5,
and the radially outward side of the tile has'an
opening I8 near its top and the radially inward
_ Referring in detail 'to the drawings, the nu,
meral l generally designates the eover- of the
furnace which rests on the base 9 and forms the
45 annealing chamber 1, on the steel ñoor 8 Iof
.side thereof has a fuel outlet opening I9 near 45
an- air-tight enclosureNformthe stacked Asheet
» of th‘e'jtilefwhich combustion chambers are de- 50
which rest the stands which include the“ legged its lower end and >on a level just below the top
bases 9, the covers having the side wallsLIIl, of the bases 9 of the stands. The tile I9 «_deflne
the closed top II and the reinforcing T’s‘ I2, l _the annealing chamberáas'~well as the four -com
the walls Il, the top Il and the b_ase 9 forming. _bustion chambers-at ltlfeffradially outward sides
50
-
metal
I3.
.
'
fined by the radially.»outward side. of-„the tile',
Each of the stands includes va base 9 the ar
rangement and formation of which is subse
quently described herein. Resting on eachV base
tlhe inner side of the insulation Il o_f thegshell', '
is the cover. which is of appropriate steel of heat
top of the shell Il enables lifting the shell into 55
and some formations in the base ‘s 'arbe' de-' ,
scribed. A handle 29 suitably 'connected' to 'the 1
9,040,994
place after the sections thereof have been
to limit the application of the invention thereto,
welded together, in order that the Ashell may be
. properly placed on the base 6.
The bottoms of
the tile rest on brick which in turn rest on the
inner flange I5’ of the bottom of the shell Il.
This arrangement of the cover relative to the
base enables removing the cover wherever nec
essary and makes it unnecessary to move the
base when it is desired to move or remove the
10 cover for any purpose.
The base which is generallyîîiesignated 6 com
prises the outer cruciform steel shell 2| and lined
the scope of the subjoined claims.
_
What is claimed is:-
f
‘
~1. An annealing furnace of the character de
scribed comprising a top or cover portion, a base
portion, said base portion containing a centralized
flue and combustion chamber forming recesses 10
provided with gas burner openings, said cover
with suitable insulating material 22 so as to de
ñne the combustion chambers 23 which com
municate with the bottom of the combustion
chambers 24 in the top of the furnace. The
centralized steel floor 8 which forms the rest for
the stand bases has a central flue opening 26.
containing tile walls extending chordally there
in and whose radially _inward sides denne the
annealing compartment and whose radially out
ward sides denne the upper' part of the combus 15
tion boxes registered with corresponding recesses
in the base, said tile having openings establishing
communication between the combustion boxes
As disclosed in Figure 2, each chamber 23 has a
and the annealing compartment.
20 number of gas burner openings 21 which lead
thereinto near the bottom.
Thel stand bases 9 are of suitable heat resist
ing material and are spaced upwardly from the
,platform 8 by legs 28 which permit the heat to
25 pass under the bases and do not in any way pre
vent the gases from passing to the ilue 26.
steel instead of tin sheets, and a single large stand
and a single large cover lis being utilized, although
30 the base is disposed directly over the top- opening
of the iiue 26, the legged Vbase nevertheless pro,vides for free access of the gases to the ilue.
It is obvious that the covers H which prevent
the ingress of gases to the material being treated
prevent the oxidation of such material which
would render the same usless for certain pm‘poses.
It is obvious that the burning fuel in the
combustion boxes 24 enters the top opening I8
in the tile and moving downwardly passes into
40 the heating chamber by way of the openings I9 in
the lower end of the tile and then after circulat
ing inthe heating compartment passes down
wardly and,- outwardly through the ilue 26, pass
ing freely under the-„bases of the stands on ac
45 count of the spacing thereof above the platform 3
by their legs 28. In this way the to'p, the sides
and the bottom of the pile of sheets I3 is uni
formly and continuously heated. The stiñ’enlng
-T’s I2 extend at right angles from the side walls
50 _of the covers Il so as to prevent undesired expan
scribed comprising a cover including a metal shell
provided with insulating material, tile walls ar-v
ranged chordally within said cover so that their
radialy inward sides define the annealing com
partment and ,whose radially outward sides deñne 25
rests, said base consisting of a metallicl shell hav
ing a filling of insulating material, said ñlling in
cluding a centralized ñue communicating with
the bottom of the annealing compartment and 30
depressions «fed by gas burner openings and reg
istering with the combustion boxes, and said tile
walls having openings establishing communica
tion between the combustion boxes and the
annealing compartment.
_
'
'
.
.
35
3. An annealing furnace of the character de
scribed comprising a cover including a metal shell
provided with insulating material, tile walls ar-ranged chordally within said cover so that their
radially inward sides define the annealing com 40
partment and whose radially outward sides deñne
combustion boxes, and a base on which said cover
rests, said base consisting of a metallic shell
having a filling of insulating material, said filling
including a centralized flue communicating with 45
the bottom of the annealing compartment and de
pressions fed by gas burner openings and register
ing with the combustion boxes, and said tile walls
having openings establishing-communication be
;tween the oombustionboxes and the annealing
. sion thereof which might permit warping of the -' compartment, the openings in the tileA feeding the
covers and permit oxidizing gases to reach the annealing compartment being at the lower end of
the tile, and the openings in the tile in receiving
Although I have shown and described here
arrangement to the combustion boxes being at the
55 in a preferred embodiment of my invention, it -is _ upper endl of the tile.
to be deñnitely understood that I do not desire
CLARENCE n. Hoax.
plates beingiannealed.
'
2. An annealing furnace of the character de 20
combustion boxes, and a base on which said cover
. It may be remarked here that when treating
35
and any change or changes may be made in the
materials, and in the structure and arrangement`
of the parts, within the spirit of the invention and