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Патент USA US2137813

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N_ov. 22, A193.8.
" c. H. scHRAMM
Filed sept. 28, 1955
3" Sheets-sheet 1
Nov. z2, 193.8.`
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Filed sept. 28, 1935
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5 sheets-sheet 2
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c. l-qlr. 'scHRAM-M
y Nov. 22, 1938.
Filed sept. 28,l 1955
s sheets-’sheet s"
- Patented Nov, 22, 1938
EL l
somme-mfr ’rocher
Christopher- Henry Schra,
uslregon, Mich.,
assigner, _by :mesme assignments, to
¿ i l s nell d Moore, lino., New Worin N. lí.,
poration ot New .Mersey
Application September 2d, i935, aerial lilo. ‘MM5
(imi. 26d-lili)
lli'he object oi. this invention is to provide a
combined hoisting and traversing mechanism
especially adapted to raise, lower ‘and traverse
the hre-brick cover of a high-temperature fur
- d nace of the door-installed type for heating in
gots in steel mills.
ln the prior art the cover of a soaking pit was
attached to a machine or carriage running upon
rails some three feet above the door. The car
lli riage was not provided With'any hoisting mecha
nism, the cover beingl raised and lowered by pro
viding declivities in the rails‘.-
When the car
trolley namely, that on which the traversing
motor is located.
In Fig. 3, a indicates the door level', h the,throat
of the soaking pit, c an annular recess in the door
encircling the throat of the soaking pit, said re
cess being nlled with sand, and d the cover of the
pit, said cover having a ñange e adapted to be
embedded in the sand when the cover is'in closed
position to form a sea‘l.
Rails f are mounted on the floor at opposite
sides of _the furnace. These rails extend far
enough away from the furnace so that the 4cover
»may be removed laterally suiiicientlyl to uncover
the throat b and asmuch farther as may be de
riage rolled down the declivities the cover'was
lowered onto the top of the furnace. Being thus
l il
im lowered sidewise -onto the furnace and traveling, The trolley comprises a rigid frame of gener
as it didfa distance of about two feet during the
, lowering operation, vit was impossible to provide ally rectangular form consisting' of 4two girders
l and i and two transverse beams d and i. This
a seal around the furnace opening. Because oi
frame is provided with rollers to that run ‘on the
`the absence» one. seal, the brickworlr of the iur
20 nace was exposed to‘i‘spalling and distortion, so
rails f. The rollers d at one end of the frame are
that in a short vtime openings were produced
through which intense heat was radiated. -'ll‘he
uneven application 'of heat in the furnace, due to
the loss of heat through openings around the
furnace throat, caused uneven heating of the in
arranged .to be driven by means including . a
gots and compelled the workmen to rearrange the _
ingots in the furnace by means of the overhead
electric ingot-handling cranei ycommonly pro
vided ior that purpose.
Moreover, the heat
escaping through the openings around the iur
nace throat caused rapid destruction oi the metal
partsbinding the furnace together and produced
transverse shait t journaled on the girds l and l.
Drive chains 'l communicate power from sprocket
wheels on the shaft to sprocket Wheels fixed on
the axles of said rollers. The shaft t is driven
through _bevel gears d l(Fig. 2) from a shaft il,
the latter being connected through a speed re
ducer lll and a flexible coupling ll to an electric
Ímotor it. Il ilA is a magnetic brake of any desired
construction for stopping the motor and thus
arresting the travel of the trolley.
, The cover d may be suspended from the trolley
at four equidistant points by any suitable means,
warping of the cast steel rails on which the car
riage operated. This manner of removing andV , as, for example, lugs g (Fig. 2) fastened to the
replacing the cover resulted in great loss of heat, cover. These lugs have a pîn-and-slot` connec 35
damage to the rails upon which the carriage
moved, disorder and delays in production, and
danger to the workmen.
By means oi the present invention an effec
40 tive seal is provided at the furnace throat, thus
conserving heat, eliminating ìthe rapid deterio
ration of rails and other structures heretofore
experienced, improving the quality of the ingots,
'promoting increased eñiciency of the operating
45 personnel, and reducing operating costs.
In the accompanying 'drawings
Figure 1 is a perspective view of a soaking pit
trolley embodying the features of my invention.
Fig. 2 is a. plan view of the trolley, the cover
50 being‘indicated by a dotted circle.
Fig. 3 is a fragmental end elevationk of the
trolley in operative lrelation to a soaking pit.
Fig. 4 is an elevation of that side of the trolley
on which the hoisting motor is mounted.
Fig. 5 is an elevation of the opposite side of the
tion,‘as `shown in Fig. 3, to swiveling clevises lil.
The latter are connected to rockers or bell cranks
i5 and i6 which areY pivoted at Il in the beams 3
and t. The `pair of rockers on the beam 3 are
connected to move together by means of a' reach 40
rod it, the rockers on the beam 4 being similarly
connected. In _order that all four rockers shall
swing in unison, the rockers .i6 ’are connected
through pitmen i9 (Figs. 2 and 3) to a crank
shaft 2li journaled in the beam-s 3 and 4. The- 45
shaft 20 is located at one side of the throat of
the soaking pit, hence its bearings are some dis
tance from the throat of the pit and thus some
what removed from direct exposureto the heat.
The crank shaft is driven through gears 2| from 50
a shaft 22. Power to drive the shaft 22 is ob
tained from an electric motor 23 through a flex
ible coupling 24 and a speed reducer 25. A mag
netic brake 26 serves to stop the motor 23 when
the cover has been raised or lowered, said brake `
assisting t'o hold the cover elevated after it has
been raised. A rotary type limit switch (not
shown) of any preferred construction may be
connected to the crank shaft 20 and adjusted to
interrupt the circuit of the hoist motor 23 at the
extreme points of crank throw, i. e., when the
cover has been lifted to full height and when
vthe cover has been allowed to rest >on the sand
A limit switch 21 (Fig. 5) connected into the
circuit of the traversing motor I2 and located
adjacent to the soaking pit is arranged to be
engaged by a cam 28 on the trolley as the latter
reaches such a position that the cover dis directly
15 over the pit, thereby stopping the traversing
' motor in that position.
It will be seen that the construction herein dis
closed eliminates all overhead apparatus, with
the dangers incident to the use and maintenance
20 of such apparatus; that the trolley is so con
structed as not to be damaged by the high tem
perature conditions to which it- is constantly ex
posed; that the cover d is directly beneath and
approximately enclosed by the trolley and is
25 raised and lowered and moved horizontally ñxed
distances without attention on the part of the
operator; thatl excessive pressure cannot be
placed upon the cover when the latter is lowered
onto its seat, as the cover has a Boating connec
30 tion with the trolley; and that by the use of con
ventional electric switches the trolley may be
easily and safely controlled to raise, remove, re
turn and lower the cover without exposing the
operator or other` workmen to danger.
In prior-art instances wherein the cover was
moved by a carriage, special apparatus was pro
vided at one side of the soaking pit for supporting
and traversing the carriage. The driving‘motor
was stationarily located along or near the path of
travel of the carriage. This arrangement en
tailed loss of space in the building and placed
limitations upon the location of the pits, it being
understood that in practice a number of soaking
pits must be accommodated in the building and
provided with cover-handling means.
My apparatus is compact and self-contained,
the motors that raise, lower and traverse the
cover being mounted on the carriage. Thus the'
apparatus occupies a minium amount of space 10
and does not necessitate any uneconomical ar
rangement of the pits.
I claim as my invention:
The combination with a soaking pit of the
floor-installed type having a cover adapted to rest
upon the floor, of rails located on the floor at
opposite sides of the pit, a trolley mounted on
said rails and adapted to be traversed -from a
position directly over the pit to a position at one
side thereof, said trolley comprising two girders 20
disposed parallel to respective ones of said rails,
roller means on said girders engaging the rails to
support the trolley‘thereon, and two transverse
beams connecting the ends of said girders to form
a rigid rectangular frame, means _on the trolley 25
for raising and lowering the pit cover comprising
a pair of bell-crank levers pivotally supported on
each of said beams and removably connected with
the pit cover, means connecting each pair of bell
cranks together for simultaneous operation, a
shaft extending across the trolley and journaled
on said beams, crank arms mounted on said shaft
adjacent said beams, each crank arm being con
nected with one of said bell crank levers whereby
to rock the levers and thereby raise and lower the 35
pit cover in response to the rotation of the shaft,
and vmeans including a motor mounted on one of
said girders for rotating said shaft.
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