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Патент USA US2119426

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May 3l, 1938.
P. H. DOUGLAS ET AL
FURNACE CONSTRUCTION
Filed Sept. 13, 1935
2,119,426 '
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INVENTOR.
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JGLAS ET AL
May 31, 1938.
2,119,426
P. H. Dol
FURNACE
CONSTRUCTION
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pt. 15, 1935
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INVENTOR,
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May 31, 1938.
P. H. DOUGLAS ET AL
2,119,426
FURNACE CONSTRUCTION
Filed Sept. l5, 1935
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May 31, 1938.
P. H. DOUGLAS ET Ax.
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FURNACE CONSTRUCTION
Filed Sept. l5, 1935
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May 3,1, 1938.
P. H. DOUGLAS ET Al.
2,119,425
FUHNACE CONSTRUCTION
Filed Sept. 15, 1935
6 Sheets-Sheet 6
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UNITED STATES PATENT OFFICE
Paul‘ll. Douglasv and John F. Rogers, 'cleveland
Heights. Ohio1 assignors to The Wellman Engif
' neering Company, Cleveland, Ohio, a corpora
tion of Ohio
Application September 13, 1935, Serial No. 40,458
i2 óiaime.
(ci. 263-46) ì
'I'his invention relates to improvements in fur
naces and particularly open .hearth furnaces. It
is especially adapted for use in carrying out the
furnace charging process> described in our appli
cation Serial No. 2'7,'179, filed June 21, 1935, for
Method of charging furnaces, in which applica
5
front a construction such as »to enable the charg
ing operation outlined above to be carried out.
Further objects are to provide a removable
furnace front with appropriate mechanism for
moving itl to and from closed position as a single-
unit; to provide an’ extracting mechanism which
tion the present furnace improvements are briefly . effects the withdrawal of the' front` from the
furnace opening in an approximately horizontal
referred to.
In our prior application Serial No, 27,779, we
10 have described a cold metal charging process the
direction and a-`lifting mechanism which then ‘
raises it vertically“ so as to clear the opening. for
the entrance of the charging pan; to provide a
removable furnace front with-one or more indi
purpose of which is to depart from the “spoonfu ”
method heretofore used in charging open hearth
furnaces and to handle the cold metal charge jin
relatively large bulk. According to this process,
viduallyV operable doors, preferably a series of -
them, arranged at spaced points along the front
for the purpose of supplying the hot metal charge ha5
and for inspection of and repairs to the furnace
hearth; and to provide operating mechanism or
mechanisms forthe movable furnace front and
operating mechanisms for the individually oper
able doors carried by the furnace front which 20
' a large part of and preferably the entire cold
metal charge required for the melting heat is
deposited in the furnace -at one time or in one
charging operation, thereby affording a more
economical process as to power and fuel con
20
sumption, speed of operation, and maintenance
.
mechanisms are of such a nature that each
cost of the charging equipment and furnace. -
mechanism can be operated independently of and
The charging process referred to above is car
interfering with the other mechanisms.
ried out by charging equipment constituting the without
Other objects and important features of nov
subject matter of a second companion application elty will appear from the detailed description of
filed by us, Serial No. 36,990, filed August 20, 1935. ' the invention which.A may >be here briefly sum
This charging equipment eliminates the use of marized as consisting in certain novel details of
the present small charging box with its trans
construction and combinations and arrangements
porting apparatus and utilizes instead a container of .parts which will be set forth in the appended
of ample capacity to handle at one time a large
cold metal charge.- It ’
30 part of if not the entire
employs a receptacle or pan with a ñexible roll
ing bottom having a ñoor or bottom area com
parablewith that> of the hearth area to -be charged
and preferably substantially equal to the entire
35 hearth area.
This pan is adapted to be filled
with cold metal at a convenient point generally
remote from the charging machine or other main
unit of the charging equipment, which layer dur
ing the charging operation is transferred to and
40 progressively laid on the hearth, the discharge of
the cold metal from the pan being such that
the layer on the hearth approximates the thick
ness and area of the layer on the pan.l
’
The present furnace improvements involve cer
45 tain modiñcationsin the structure at the front
of the furnace, and the provision of an appropri
ately large door or removable furnace front which
is adapted to close an opening equal substantially
to the length of the hearth and adapted to permit 50 the insertion of the pan of a charging machine
of such dimensions that the entire hearth can
be covered with cold metal in one charging oper
ation, as stated above.
' The principal object of the present invention
is therefore ‘to provide a furnace having at the
30
_
claims.
'
.
‘
In the accompanying sheets-of drawings where- '
in we have shown the preferred construction and
a slight
modification,
v
~ `
Fig. l is a front elevation of the improved fur
nace;
,
i
as
Fig. 2 is a plan view of the same;
Fig. 3 is a cross-section taken through the cen
ter of the furnace substantially along the'line
3-3 of Fig.- 1;
Fig. 4 is a fragmentary cross-sectional> view `
taken through the door opening of the _center
door of the removable furnace frorìt showing the
dooropen;
Fig. 5 is a cross-sectional view through the 45
front portion of the furnace substantially along
the line 5-5 of Fig. 1, with the furnace front in
closed or normal position:
Fig. 6 is an end view of the movable front
shifting mechanism showing in outline a portion 50
of the furnace;
_
n
~
Figs. 'l and 8~are views similar to Fig. 5, Fig.
'l showing the removable front extracted from the
front opening by horizontal or forward move
ment and Fig. 8 showing the removable front 55
2
2,119,426 '
elevated to provide clearance for the pan of the
charging machine;
Fig. 9 is a fragmentary detail view'showing the
connection between one of the lifting `arms and
the lifting beam which is moved vertically to
shift the furnace front from the position shownI
in Fig. 7 to the position shown in Fig. 8;
Fig. 10 is a view similar to Fig. 1 showing a
front view of the furnace proper and some of
the shifting mechanism for the removable front
which is here shown in slightly modified form
by being composed of relatively movable articu
lated sections;
Fig. 11 is a sectional view substantially along
15 the line il-II of Fig. 10; v
Fig. 12 is, an enlarged fragmentary sectional
view substantially along the line |2--I2 of
Fig. 10;
.
\
Fig. 13v is a view lookingltoward the front of
the joint illustrated in Fig. 12; and
_
Fig. 14 is a view similar to Fig. 5 but on a re
duced scale showing certain partsv of the fur
nace front extracting mechanism for the sec
tional furnace front illustrated in Figs. 10 to 13.
Referring now to the drawings, the open hearth
furnace may have the usual construction except
for the novel construction provided at the front
"
able two distinct front shifting mechanisms,
namely, an extracting. mechanism which moves'
the front 28 approximately horizontally out of
the furnace opening (Fig. 7), and a lifting mechL
anism which raises it vertically above the fur
nace opening to the position shown in Fig. 8.
Considering ñrst the extracting mechanism for \
the movable furnace front, it'is to be noted that
this mechanism is of the parallel motion type
composed of parts so arranged as to maintain the 10
front in vertical position during the extractingmotion. This parallel motion mechanism includes
a plurality of upper uniformly spaced arms 29>
(Figs. 1, 5, 7 and 8) which at their lower ends are
pivotally connected at 30 (see particularly Fig. 15
5) to the upper part of the _frame 28a of the fur
nace vfront 28 and at their upper ends are secured
to a pair of aligned rockervshafts 3| supported
in bearings mounted on top of a lifting beam
32 which extends across the upper front part of 20
the furnace and is designed to support the fur
nace front 28 and all of the lifting parts. The
extracting mechanism includes also a seriesA of
equally spaced lower arms 33 best shown in Figs.
1 and 5 winch arms at their lower ends are pivot
ally connected by pins 34 to the lower part of the
front frame 28a and at their upper ends are con
thereof including the long removable furnace nected by pivot pins 35 (Fig. 5) to brackets 36
door or front equal substantially to the length of which are secured to the bottom of the lifting
I the hearth, as already
stated, with its associatedr beam'32. As will be seen particularly by refer
parts including the individually- operated doors ence
to Fig. 1, the upper- and lower arms 29 and
carried thereby, the extracting and lifting mech
33 are arranged in pairs andthe arms of each pair
anism. the operating mechanism for the individ
are connected by adjustable connecting rods _31
1ual doors, and the framework at the top of the which complete the parallel motion mechanism
furnace which supports the motors and the like the four points of each parallelogram being ap- .
for shifting the individual doors and for extract
parent from Fig. v5. The two rocker shafts v3l
ing the furnace front.
_
.
In Fig. 3 the conventional hearth is shown- at
28 and the usual arched roof at 2|. The long
cold metal charging opening 22 (see particularly
Figs. 7 and 8) inthe front'wall of the furnace
around by a water-cooled hollow
23. 'I'he top portion of the
' is protected all
are located on opposite sides of the center of the
lifting beam 32 and operate in unison each shaft
manipulating through the associated parallel
motion >units one-half of the furnace front 28.
'I'he two rocker shaft arrangement is preferred
but obviously a single continuous shaft may be
employed instead.
It will be observed that the outer ends of the.
rocker shafts 3| are provided with arms 38 which
' ends by columns 25
.
ported by this girder and by the rear columns
are fixed to the rocker shafts, these arms being
Y provided at their lower ends with rollers 39 (see
particularly Figs. 6 and 7-) which are adapted to
28 is an upper steel framework 21 on which are engage with two rockervoperating and'guide arms
supported certain operating mechanisms for the ' 48 which are pivoted intermediate their ends at
furnace front and the individual doors vthereof
(see particularly Figs. 2 and 3), as will be ex
plained. later. With the upper front part of the
furnace supported in this manner, theopening
55 22 is unobstructed from end to end.
'I'he furnace front illustrated in Figs. 1 to 9 is
. a continuous rigid
member including a water
cooled hollow steel frame 28a supporting a brick
4| (Figs. 6 and 7) on brackets 42 secured to the 50
truss 24. The arms 38 and the rollers 39 there
on thus provide actuating cranks for therocker
shafts 3|. These two operating and guide arms
40 are »provided at their lower ends with hooks
40a forming pockets in which are engaged- the 55
rocker arm rollers 39 when the furnace front 28
is in its lowermost position. Accordingly, a rock
lining 2lb, 'see particularly Fig. 5, the inner sur
» ing motion imparted to the arms 40 will shift the '
face of which is fiush with the inside of the fur
nace wall when the front 28 is in its closed po
consequent rocking» movement of the rockerf
rocker arms 38 and the rocker shafts 3| and the
sltion. The furnace front, whether it is rigid shafts 3| through the parallel motion units com
from end to end or formed of relatively movable l
posed of the ‘arms 29 and 33 and the connecting
or articulated sections, is designed to ñt closely rods 31 moves the furnace front 28 into and out
within the water-cooled steel frame 23 at the of the furnace front opening 22. It mig-ht be
front of the furnace. If desired, the inner sur
here stated thatthe parallel motion mechanism
Afaces of the upper and lower walls and also the is such that when the door is being-_ _extracted
end walls may be on a'. taper or inwardly con
it will be slightly'elevated while being moved .fpr
70 versent to insure the close ñtting relationship be
tween the furnace. front and the furnace front
frame although this is a detail which may be
modiñed as may be found necessary or desirable.
The close fitting' relationship of the furnace
75 front in the stationary furnace front frame 23
of the furnace makes necessary or at least desir
.6.5
wardly in the extracting motion and slightlywlow
ered as it is moved rearwardly in the restoring 70
motion, as is desired. This will be apparent by
a comparison of the four points of the parallel
motion unit shown in Fig. 5 with the correspond
ing points shown in Fig. 7.
When the furnace front is in its out or ex
2,119,426
traeted positmn (Fig. 'n the operauhgvand guide
ing its upper and lower positions. The cranks
' arms 45 provide vertical guides upon which the ' 6I are mounted on the outer ends of two shafts
rocker arm rollers `“operate during the lifting
motion (see Fig. 8) so that during this motion`
the rocker arms 55 do not move in relation tothe
other lifted parts and the only motion of the.v
furnace front 28 is a vertical lift.
"
The upper ends of the rocker operating arms
40 are connected by adjustable connecting rods
10 43 to two .'cranks 44 (Figs. '2, 6, 7, and 8) which
cranks are mounted von the vouter ends of two
shafts 45 which are carried in bearings on the
upper framework 21 (see Fig. 2). These shafts
45 are aligned, as best shown in Fig. 2, and at
15 their adjacent inner ends are connected to re--
82 (Fig. 1) lournaled in bearings 55 `and ter
minating at the center in a speed reducing unit
54 driven by an electric motorj5'equipped with a
suitable solenoid Jbrake 55. The cranks _are
equipped with counterweights 51 which, together
with the rocker arm counterweights 55, -balance '
practically all of the lifted and moving parts.
'I'he‘rocker arm supports 59 and driving 'mech
anism for the rocker arms are mounted on >foun
dations at the ground level. It might bfe here
mentioned that while the above described mech
anism for raising and lowering the lifting beam
is preferred, other means 'may be employed for 15
ducing gearing arranged in housings 46 and
this purpose.
driven by anelectric motor l41. The reducing
gearing is preferably of the double-reduction type
spaced intervals with a centrally disposed hot »
L
.
~
'I'he removable furnace front 28 is provided at
and runs in o'ii contained in the housings, and Vmetal charging door and additional doors for
20 the motor will be equipped with a suitable brake observation and repairs spaced equally along the
length of the furnace front. All these doors,
which are designated by the reference character
Thus to extract the furnace front the motor- 68, are of the same general construction except
41 is energized and rotates the two shafts 45 that the central vhot metal door isppreferably
made larger than the- others to accommodate the 25
25 through a half revolution so as to swing the
cranks 44, 180° from the position shown in Fig. 6 pouringspout ofthe charging ladle. Each of
(thefurnace front here being in normal or closed these doors preferably consists of a hollow steel
position, as in Fig. 5) to the position shown in frame 68a arranged for water-cooling and pro
Figs. 7 and 8. This rocks the operating arms 40. . vided with a brick lining 65h (Fig. 3). A small
opening 68e in the lower part' of each door pro 30
30 swinging them outwardly form the position shown
in Fig. 6 to the position shown in Fig. '1, and this vided with an easily opened cover facilitates in
motion of the armsr 45 rocks the rocker arms 38 spection of the furnace contents. Each of the
and the rocker shafts Il and actuates the several doors 55' is suspended by a pair of suspension
indicated conventionally at 45 in Fig. 3, but these
features are not material to theinvention.
parallel motion units so as'to move the furnace
arms 59-lpivoted at 10 on the upper part of the
front 28 from vits closed podtion shown in Fig.
5 to its extracted -position shown in Fig. 7. Ob
furnace front frame 28a so that >when the door '
viously, a further rotation of a half revolution.
given to shafts 45 and the consequent 180°
swinging or rotation of the cranks. 44 will rock
the operating arms -45 in the reverse direction
and cause the furnace frontto be restored to nor
mal or closed position.
`
Assuming that the furnace front has been ex
tracted by being moved forwardly substantially
horizontally (but slightly lifted) to the position
shown in Fig. 7, it is nextl elevated and this is
accomplished by the lifting mechanism next to
be described.
'
.
The lifting beam 52 is adapted to be raised and
lowered between a series of inner guides 45 (see
Figs. 1, 5, and 9) secured to and extending ver
tically along the front of the supporting truss 24'
and a pair of outer vertical guidesI 55 (see Figs.
1, 6, and 9) secured to the truss 24 near its
is ,in closed position it rests by gravity against
a slightly inclined surface around the door open
ing on the front side of the removable furnace
iront so as to insure a tight closure in the open
ing operation. Each of the doors is operated by
an independent motor driven mechanism sup
ported on the upper furnace supporting frame
mechanism 21 and consisting of a chain 1I which
yis anchored-to the top of the door 55 and passes
over a sheave 'l2 mounted on the lifting beam 32 45
(see Figs. 3 and 4), and passes to the crank 15
driven through a gear reduction unit 14 by an>
electric motor 15, best shown in Fig. 3, the motor
being equipped with a solenoid or other brake.
Each crank 15 is on a shaft provided with an arm
15 to which a counter-weight 11 is attached to
relieve the gears and the motor ofthe peak load
>on the crank during the opening operation.
In the opening operation, the top of the door _ f
swings outward and upward on the radius of the 55
lowered by two substantially vertical links 5| suspension arms 55 while the bottom is held close
(Figs. 1 and 6)*which at their upper ends are to the furnace front 25 by two rollers 15 mounted
connected by pins 52 (see Fig. 9) to brackets on opposite sides of the frame of the door 55
53 secured to the lower side of the' lifting beam and operating in guides 19 provided on the fur
32 near its ends. These links extend downward nace frontframe 25a.,the door being shown inthrough the charging door and at their lower closed position in Fig. 3 and in open position in
ends are connected by pins 54 to two operating Fig. 4. `The arrangement is such that.` a half
revolution of the crank 13 opens the door to its
rocker arms 55 which are .equipped with counter
weights 56 which balance the weight of thelifted full open position and the next half revolution
parts to a point just permitting the lifting beam ` closes it, and, when closed, the door is not dis 65
turbed by the extracting and lifting motions of
to lower by gravity on iìxed stops 51 on the fur
outer ends.
The lifting beam J52 is raised and
nace supporting truss or girderl 24, thus insuring
proper seating of the furnace front in the, fur
nace opening when the furnace` front is being
70 replaced. The rocker arms are pivoted inter
Y mediate their ends on pins 58 in suitable supports
59 and are operated through adjustable connect
ing rodstll by twov cranks 6I (Fig. 6) which make
a half revolution when raising the front and a
the furnace front.
,
The electric controls for the furnace front ex
tracting and lifting motions are preferably so ar
ranged that, after starting, the entire action of
opening or closing the front is automatic.
For t
example, while no attempt is here made to show
the control mechanism including the electric cir
cuits and switches, the following control mecha
v. half revolution in lowering it, thus definitely iix- 1 nism operating in the manner described may be
75
4
2,119,426
utilized. The operator will press an “open" push ’ only in the slight‘change in the form of the upper ,
button which starts the opening motion, the extracting> levers~29 and in the manner of con
cranks- NM making a half revolution, swinging the necting the lower ends of the upper and vlower
removable frorît 28 out of the furnace opening. l,extracting levers with the furnace front.v By
At the end of the extracting motion, electric comparison of Figs. 5 and 14,.it will‘be seenthat
'switches operated automatically by the mecha -the
parts ofthe parallel motion extracting units
nism stop the extracting lmotion and start the are thesame in principle and arrangement, but
lifting motion which continues until tlîe cranks _ in- Figs. 10 and 14 the upper arm or lever which
6| have made a half revolution and the furnace
10 front has reached its full open or raised position, corresponds to the upper arm 29 of the first con
when another electric switch automatically stops
the motion. In the closing operation, the oper
ator presses a “close” push button and the above
automatic operation is reversed. _The'above de
15 scribed electrical control is preferred, but any
other suitable control _may be substituted there
for. Likewise. in operating the individual doors
68, an “open” push button may be pressed, and
when the crank 13 corresponding to the operat
ing mechanism for that particular door has made
a half revolution, the motor is automatically
stopped, and to close 'the door the operator will
push the “close” button for the door, whereupon
the motor 'I5 will again be energized, and when
the crank ‘I3 has made a half revolution, the
motor will be automatically stopped.y
It was previously stated that the `removable
furnace front may be a continuous rigid member
or it may be composed of relatively movable or
" articulated sections. The latter construction may
be desirable in order to secure a close fitting of
the furnace front in case the furnace hearth or
skew-back becomes warped out of alignment, in
which event the furnace front when seatedwill
conform substantially to the warped surface‘by
the seating of the sections of the furnace front
as individual units. That is to say; the furnace
front will vbe capable of accommodating itself to
any warping which may occur in the frame of
the furnace structure into which the furnace
front is adapted to be inserted.
_. -
-
In Figs. 10 to 14 a sectional removable furnace
front is shown. The furnace front which is here
designated 28e is divided vertically into a num
ber of sections, in this instance ñve sections, pro
vided with» water-cooled interlocking joints 28d
best shown in Fig. 12.
Each section or unit of
this removable furnace front is preferably pro
vided, as in the case of the rigid continuous’V re
movable furnace front, with an outer water
cooled frame 28e and an inner brick lining 28j.
The adjacent sections of the furnace front 28e
are connected together by horizontal links 80
best shown in Figs. 12 and 13, the ends of which
65 links are connected byl vertical pins 8i to pairs
struction is designated 29a, and >the* lower arm
correspondingto the arm 33 of the first construc
-tion is designated 33a.
'I‘he adjustable connect- -
ing rods corresponding to the rods 31 of the ilrst
construction are designated 31a. The upper ends> '
of the arms 29a are connected to shafts 3| simi 15
lar to 'the shafts of the first construction and the
upper ends of the lower arms 33a are lpivotally
connected as before to the bottom of the lifting
beam 32..
The connecting rods 31a are connected '
to the upper and lower arms respectively at
points equidistant from the centers of the `connections between the upper ends of these arms
and their respective supporting vmembers so as -
to complete the parallelogram. In this instance,
the lower ends of the upper and lower arms are
connected differently to the removable furnace
front than in the first construction. So that the
extracting mechanism may not interfere with the
proper -seating of the individual sections of the
furnace front, equalizing connections are made ' l
between the arms of the parallel motion extract
ing units and the sectional furnace front, and to
that end the lower ends of the arms are connected
to the links 80 (which connect the adjacent sec
tions of the sectional front) by universal or ball
and socket joints. Accordingly, the links 80 are
provided centrally thereof with spherical- seats
80a, see particularly Figs. 12 and 13, and the
lower ends of the arms are provided with spheri
cal sockets 80h which have a universal iit on the 40
spherical seats. As shown in Fig.`12. each socket
is composed of two parts one retained in place
by a shoulder and the other by a keeper plate or
any other equivalent means. By reference to
Fig. 12. it will be seen that relative movement 45
between the two adjacent sections of the furnace
front does not interfere with the connection of
the arms of the extracting mechanism nor will
the latter interfere with any relative movement
which may occur between the sections when the 50
furnace front is being seated.
-
As the upper and lower connecting links Ih
are directly in line with each other, in order that
there may be the necessary clearance >and free
dom of movement between the upper arms 29a
of ears 82 lpñiecting forwardly from the fur- , andthe lower'arms 33a of the parallel motion
nace front section. ’I'he sectional furnace front, extraction'units, the upper arms 29a are forked
aside from the fact that it is formed of relatively
movable sections, is similar to the continuous
front, as will be seen by a comparison of Figs. 1
and 10. The sectional furnace front is provided
with individual doors which are preferably con
structed and operated identically the same as'
the doors of the removable front first described.
Likewise, the extracting and lifting movements
`oi’ the sectional furnace front correspond pre
cisely with the extracting and .lifting movements
of the rigid or continuous furnace front and the
extracting and lifting mechanisms for the sec
tional furnace front are preferably the same in
their action and they may be the same. also in
construction except for certain slight modifica
tions in the extracting mechanism. ’I'he ex
tracting mechanism for the sectional furnace,
or bifurcated, as shown in Fig. 10.
`
-
As will be seen by reference to Figs. 10 and 11,
and, as previously stated, the sectional furnace
front is divided into five sections each having one
of> the individually movable doors 6l.
'I'hese
doors will be operated in precisely th‘e same man
ner as previously described. Likewise, Vit will be
noted that while there are five sections or units
inl the sectional front, there are in this instance.
six- parallel motion extraction units as in the
construction-first described. 'I‘he arms of the
four inner'extracting units shown in Fig. 10 are
connected to equalizing links which connect the 70
sections of the furnace front, while the arms> of
the two ‘outer extracting units are similarlycon-v
nected to links which, however. in thesev two in- ' ~`
stances do not function to connect together sec-1
front differs fromthat of the continuous front - tions of the sectional front as is the casewith
/
V
5
2,119,426
the other four extracting units. inasmuch as the
individual door shifting mechanism for the sec
tional front may be the same as that» first de
scribed, and inasmuch as the extracting and lift
ing mechanism is otherwise no diñerent from the
corresponding mechanisms first described, the
sectional front construction and its associated
mechanism need no further description. It might
be here stated, however, that whilel we have
10 shown a continuous removable furnace front
provided with a series of doors capable of _being
individually opened, and have shown also a sec
tional front each section in this instance being
provided with one of the individually movable
doors, withthevarioussectionsconnectedtogether
in a manner such that the entire furnaceÀ front
with the individual doors may be moved into and
out of the _furnace opening the Asame as with the
rigid continuous furnace front, we do not desire
20 to be confined to the method of sectioning the
furnace front here disclosed as the front may be
sectioned and the sections Joined together in
numerous other ways so as to admit of relative
movement both horizontally and vertically be
25 tween the sections when the front .is being seated
to accommodate itself to any warping which may
occur in the furnace and particularly in the sta
tionaryframe~ in which the front is seated.
Thus it will be seen that we have provided an
30 open hearth furnace having a removable front
which is substantially as long as the hearth and
which can be readily extracted and lifted and
restored in place so as to admit of the insertion
of a charging pan or'other receptacle having a
35 floor area similar in size to that of the furnace
hearth. thus enabling the entire hearth to be
covered with cold metal or other material in one
charging operation, and, if desired, allowing- the
entire cold metal charge to be deposited on the
hearth in a uniform manner in one' charging op
eration,'as described in our prior applications. -At
the same time, the furnace front is provided with
hot metal and inspection doors arranged and
functioning as in the usual open hearth furnace.
45 The provision of a removable furnace front com
parable in length with the yfurnace hearth and the
provision thereon of individually movable doors
similar to those now in use on the non-movable
or permanent open hearth furnace front, the
extracting and lifting mechanisms for the fur
nace front, and the operating mechanism for the
various doors each capable of functioning with
out interference with the other, constitute fea
tures believed to be new individually considered
55 or in combination.
While we’ have shown certain preferred con
structions of the furnace. front itself and of the
various operating mechanisms, we do not desire
to be confined to the constructions or arrange
ments illustrated and described but aim-in_our
claims to cover all modiñcations which do not
. 2. In an open hearth furnace having an open
ing at the front‘ thereof substantially equal in
length tô the length of the hearth, a front mov
able as a single unit to open or close substantially
the entire front opening, a beam extending trans
versely above said front opening, parallel motion
linkage carried by said beam and comprising plv
oted arms having connection with said front ad
jacent the top and bottom thereof, and means for 10y
actuating said linkage.
v3. In a furnace having an opening at the front '
thereof, a front movable to open or close said
opening, a vertically movable _lifting beam ex
tending transversely above said front opening,
parallel motion linkage carried by said beam and 15
having operative connection with said front,
means for actuating said linkage to shift said`
front into or out of said opening by substantially
parallel movement, _and lifting means connected
with the beam for elevating the beam and the 20
front.
f
.
v
.
4. In a furnace having an opening at the front
thereof, a front movable to open or close said
opening, a beam extending transversely above
said front opening, parallel motion linkage -car 25
ried by said beam- and having operative connec
tion with said front for shifting the same into
and out of said opening by substantially parallel
movement, said linkage comprising arms pivoted
adjacent the top and bottom of the beam and 30
having connection respectively with said front
adjacent the top and bottom thereof. and means
for actua-ting the linkage.
5. In a. furnace having an opening at the front
thereof, a removable front for closing said\ open 35
ing, a beam adjacent the front of the furnace
and extending transversely over said opening,
parallel motion linkage comprising upper and
lower arms connected with the front adjacent the
top and bottom thereof, vertically spaced pivot
40
means connecting the arms with said beam in
cluding a rock shaft adapted to cause actuation of
the linkage, and means for oscillating the rock
shaft.
6. In a furnace having an opening at the front 45
thereof,"a removable front for closing said open
ing, a vertically movable lifting beam adjacent
the front of the furnace and extending trans
versely over -said opening, parallel motion linkage
comprising upper and lower arms connected with 50
the front adjacent the top and bottom thereof,
vertically spaced pivot means `connecting 4the '
arms with >said beam including a rock shaft
adapted to cause -actuation of the linkage, means
for oscillating the rock shaft, and lifting means 55
connected with the beam for elevating the beam
andthe
front.
_~'I. In a furnace having an opening
at the front
thereof, a removable front for closing said open-_
ing, a rock shaft adjacent the front of the fur-` 60
nace and extending transversely over said open
ing, means for rocking said shaft, and parallel
involve a departure from the spirit and scope of ‘ motion linkage comprising pivoted arms connect
_ ed with said front and adapted to be actuated by
the invention in its broadest aspects.
Having’thus described our invention, we claim:
65
l. In an open hearth furnace having an open
ing at the front thereof corresponding substan
tially with the length of the hearth, a front mov
able as a single unit to open or close substan
tially the entire front opening, a beam extend
70 ing transversely’above said front opening, par
allel motion linkage carried by vsaid beam and
having operative connection with said front, and
said rock shaft for shifting the front into or out 65
of said opening by substantially parallel move
ment.
‘
8. In a furnace having an opening at‘the front
thereof,’a removable front for closing said open
ing, a beam adjacent the front of the furnace and. 70
extending transversely over said opening, a rock
shaft mounted on said beam, lever having pivotal
connection with said. beam and said front and ,
means for actuating said linkage to shift said adapted to be actuated by the rock shaft, lifting
front into or out of said opening by substantial _ mechanism connected with the beam for elevating
ly parallel movement.
' 2,119,426
the beam and the front,vmeans providing a _crank
on said shaft, and a pivoted arm engageable with
said crank for rocking said shaft and having
guide means along which the `crank moves dur-`
ing elevating of the beam and'front..
9. An open hearth furnace having a long front
opening, a frame denning said opening, a remov
able front adapted to be seated in said frame, said
front comprising a plurality of sections and con
movements comprising an extracting mechanism
connected with the front for moving it forwardly
substantially horizontally out of the front open
ing and an elevating- mechanism operatively con
nected with the front for thereafter lifting it to
clear said front opening.
12. An open hearth- furnace having -a iront
opening of substantial length, a front adapted to
10 necting means providing for relative movement
be moved as a unit to open `or~c1ose the entire
between the sections, and means engaging said
connecting means and operable to shift said
its open position by successive independent move
ments comprising an extracting mechanism con
nected with the iront for moving it forwardly
substantially horizontally out of the front open
front as a unit to> open and close said opening.
10. An open hearth furnace having a long
front opening, a frame deiining said opening,
an articulated removable front adapted to be
seated in said frame and comprising a plurality
of sections having connecting links therebetween,
and means having rockable connection with said
20 links and operable to shift said front as a unit
to open and close said opening.
11. An open hearth furnace having a front
opening of substantial length, a front adapted
to be moved- as a unit to open or close the entire
25 front opening, and means for moving the front
to its open position by successive independent
front opening, means Vfor moving the front to
ing and an elevating mechanism operatively'con
nected with the front for thereafter lifting it to
clear said front opening, said front having a plu
rality of spaced individually movable doors there
on, and mechanism for selectively shifting the in
15
dividual doors, the front actuating mechanism 20
and the door actuating mechanism being oper
able independently and without interfering with
each other.
PAUL H. DOUGLAS.
JOHN F.
26
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