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Патент USA US3058192

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Oct. 16, 1962
w. w. URMETZ ETAI.
3,058,182
BOTTOM RING ASSEMBLY
Filed oct. 14. 1960
s sheets-sheet 1
23
INVENTORS
MIL r6@ M4 äfaMsrz
By JOEL C .CARPENTER
ì
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14n-ORNE Ys
OCÍ- 16, 1962
w. w. URMETZ ETAL
3,058,182
BOTTOM RING ASSEMBLY
Filed Oct. 14, 1960
5 sheets-sheet 2
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IN
ÜNTORS
WAL re@ 1M @METZ
By ‘ha C. CARPENTER
Q f.
Afro NEYS
v
0d» 16, 1952
w. W. URMETZ ETAL.
3,058,182
BOTTOM RING ASSEMBLY
Filed Oct. 14. 1960
5 Sheets-Sheet 3
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INVENToRs
WALTER Mnl/@März
Sì, BY JOEL C. CARPE/mm
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' EVS
United States Patent Utilice
l
3,058,182
Patented Oct. 16, 1962
2
The most generally used form of wiper strip is one se
3,053,182
cured in position by its attaching portion extending be
BSÍTOM RENS ASSEMBLY
tween the upper face of the bottom ring and the lower
end of the hot top casing. Consequently the line of con
Walter W. Urinetz, Seven Hills, and lîoel C. Carpenter,
Chagrin Falls, Gino, assignors to Oglehay Norton Corn
tact of the angularly and upwardly projecting wiper lip
pany, Cleveland, Gliio, a corporation of Delaware
with the mold Wall is above the plane of the upper face
of the bottom ring. This results in the molten metal hav
ing unrestricted freedom to `rise into the clearance space
between the hot top and the inner wall of the mold until
it contacts the wiper lip, and consequently increases the
likelihood of the formation of fins about the lower yend
of the hot top which might cause “stickers” Also reliance
against the molten metal overflowing the mold depends
on the functioning of the `wiper lip.
The most usual form of wiper strip does not protect
the bottom ring against damage by engagement with the
top of the mold when the hot top with the ring assembled
thereon is lowered into the mold and is not properly
aligned with the mold opening. This is particularly true
Fiied Got. 14, 195o, Ser. No. 62,757
it) Claims. (Cl. 22-147)
This invention relates to a bottom ring assembly for a
hot top used with an ingot mold in the pouring of molten
metal, such as steel, to produce an ingot.
More particularly the invention relates to a refractory
bottom ring and wiper strip combined therewith and con
stituting a unit assembly.
This application is a continuation-in-part of Urmetz
and Carpenter application ySerial No. 815,852, now aban
doned, filed May 26, 1959.
As is well known in the art, hot tops are placed in the
open upper ends of ingot molds and the molten metal is
poured through the hot tops into the molds until they are
filled and the hot tops contain a volume of the molten
metal sufficient for the hot tops to function to feed the
molten metal into the pipes or shrinkage cavities tending
to form in the solidifying ingots.
A common form of reusable ~floating type hot top com
prises a refractory lined metal casing to the lower end
of which a single use refractory bottom ring is attached
by means of wire attaching clips.
The hot top usually is provided with a sheet metal
wiper strip, the function of which is to form a seal be
tween the hot top and the inner wall of the ingot mold
to stop off the rising molten metal that enters the clear
ance space between the hot top and said wall. In other
words, the function of the wiper strip is to seal off this
clearance space to prevent the molten metal from rising
too far therein or from overflowing the top edge of the
mold. When the molten metal rises too far in this clear
20 when the hot top is inserted into a mold having a close
fitting opening. Damage thus occurring to the refractory
bottom ring may cause broken pieces or chips thereof to
fall into the ingot mold and this may result in inclusions
in the ingot unless such refractory pieces or chips are
25 removed before the pouring of the molten metal.
In preparing a hot top for use the metal casing is
mounted in inverted position on a preparation stand and
the bottom ring is placed on the now uppermost lower
end of the casing. 'I‘hen the separate wiper strips are
30
positioned by inserting the attaching portions thereof be
tween the bottom ring and the lower end of the casing.
Following this the conventional attaching clips are posi
tioned and are connected to the vbottom ring and the casing
to hold the bottom ring and wiper strips in position rela
35 tive to the casing. This preparation procedure is time
consuming. Also the bottom rings and the separate wiper
strips prior to application to the casings of the hot tops
ance space it is apt to form a fin around >the hot top
must be separately shipped, stored and handled.
casing which would cause “stickers” when the hot top is
Efforts have been made to iind satisfactory methods of
being stripped from the sinkhead and the mold after the 40 securing the wiper strips to the bottom rings during .the
ingot has solidified. If the molten metal overilows the
manufacture of the bottom rings. These efforts have in
upper end of the mold and solidiñes it can produce
cluded attempts to mold the wiper strips into the rings
“hanger” ingots causing hanger cracks on the surface
during the molding of the latter and this required special
thereof and interfering with the floating movement of the
molding
equipment for forming the rings and adds con
45
hot top relative to the ingot mold.
siderably to the cost of manufacture.
Wiper strips have been used in sets of a plurality of
Efforts have been made to mechanically secure the
separate strips to a hot top and which strips conjointly
wiper strips to the bottom rings and this would require
extend completely around the lower end of the hot top
that the rings be provided with cored holes, the »forma
casing. These wiper strips have an attaching portion that 50 tion of which complicates and slows down the ring mold
extends between the upper face of the bottom ring and
the lower end of the casing of the hot top and are held
in position by the bottom ring when it is secured to the
casing by the attaching clips. The wiper strips have wiper
ing operation. The mechanical attachment of the Wiper
strips to the rings usually necessitates a costly operation
such as riveting or the use of other mechanical securing
means.
lips which are integral ‘with the attaching portions and
As above stated, a number of separate conventional
project angularly and laterally upwardly of the periphery 55 wiper strips must be used each time the wiper strips are
of the hot top.
assembled with the hot top and the bottom ring and
To obtain correct positioning of the wiper strips rela
usually at least four wiper strips are required. This
tive to the ring and hot top casing the wiper strips in some
means that the separate wiper strip pieces must be handled
instances have been provided with positioning tabs that 60 separately from storage and each piece separately in
iit into locating recesses formed in the bottom ring. Un
serted and positioned between the hot top casing and the
less these positioning tabs and locating recesses are cor
bottom ring during the preparation of the hot top for
rectly interengaged the wiper strips may not be properly
positioned so their wiper lips can have correct engage
ment with the mold wall. ln those instances wherein the
casings of the hot tops are old and somewhat worn or
each pouring operation.
According to the present invention a vbottom ring as
sembly is contemplated that' includes a wiper strip means
as part thereof and which eliminates the disadvantages of
the conventional wiper strips and the manner of their
securement to the hot tops and rings. In addition, the
invention contemplates a bottom ring assembly of this
distorted the bottom rings may not seat correctly against
the lower ends of the hot top casings and this could cause
the wiper strips to be improperly positioned so that their
wiper lips lwill not make effective contact with the mold 70 character wherein the functioning of the wiper strip
means to seal off the molten metal rising in the ingot
wall and provide the necessary seal between the hot top
mold is substantially increased in efficiency and the like
and the mold Wall.
8,058,182
4
3
lihood of “stickers” or of “hanger” ingots is minimized.
In this latter connection the bottom ring assembly em
bodying the invention is so constituted that as the hot
top moves in the ingot mold and the wiper lip of the
wiper strip means engages the wall of the mold and is
ilexed by such engagement the attaching portion of the
wiper strip means at its junction to the wiper lip as a
fulcrum will have a rolling action on the periphery of the
bottom ring and will `cause the attaching portion at a
The bottom ring and wiper strip unitary assembly of
the present invention assures the correct positioning of the
wiper strip means since the strip means is an integrated
one and is attached to and backed up by the bottom ring
and constitutes therewith a unitary assembly and hence is
not subject to being disturbed from its proper position
during the insertion of the hot top into the mold.
The bottom ring assembly embodying the invention
possesses manufacturing, assembling and functional ad
location spaced axially downwardly from the wiper 10 vantages in addition to those above referred to and many
of which will be mentioned during the detailed descrip
lip to move into the clearance space between the hot top
tion of embodiments of the invention which is to follow
and the -wall ofthe mold and thus substantially restrict this
and which embodiments are illustrated in the accompany
clearance space at a point closely adjacent to the lower
ing drawings forming part of this specification and where
entrance to such space. Therefore the molten metal is
blocked or substantially blocked at the threshold of the 15 1n
FIG. l is a sectional view through a reusable com
clearance space from rising therein in a substantial vol
posite hot top of the floating type, to the lower end of
ume thus lessening the production of fins or the likeli
the metal casing of which is attached a bottom ring as
hood of overllowing the mold whereby the danger of hot
top “stickers” and “hanger” ingots is substantially re
sembly embodying the present invention, the hot top being
duced. This blocking of or reduction in the entrance to 20 illustrated as inserted into the open upper end of an
the clearance space supplements the sealing function of
the wiper lip.
'
ingot mold which is fragmentarily shown in section and
prior to the wiper lip of the wiper strip means having
contacted said mold.
In the pouring of molten metal into ingot molds the
FIG. 2 is a fragmentary view of the lower right hand
pourer should momentarily shut olf the flow of metal
when molten metal in the mold begins entering the clear 25 portion of FIG. l but on a substantially enlarged scale as
compared to -FIG. l.
ance space between the hot top and the wall of the mold.
FIG. 3 is a view similar to iFIG. 2, but illustrates the
This interruption is to allow the molten metal which has
relationship of the bottom ring assembly -with respect to
entered the clearance space to solidify sufficiently to seal
the mold after the hot top has moved farther into the
off such space.
One of the purposes of the wiper strip is to produce a 30 mold and the Wiper lip of the wiper strip means has
engaged and been ñexed upwardly by the inner wall of
“chill” in the molten metal which has entered the clear
the mold and the attaching portion of the wiper strip
ance space and contacted the wiper strip to thus facili
means, due to its rolling action on the periphery of the
'tate the required degree of sealing solidi'ñcation of such
bottom ring, has moved outwardly thereof toward the
molten metal.
In accordance with the present invention the chilling 35 inner wall of the mold to block or substantially block the
entrance -to the clearance space bet-Ween the hot top
effect of the Wiper strip means on the molten metal at
and said inner Wall.
or in the clearance space is increased since both the
FIG. 4 is a plan view of the bottom ring assembly
wiper lip and the attaching portion of the wiper strip
shown in `the previous views but detached from the cas
means which, due to the rolling action referred to has
-rnoved into the clearance space, are effective for this pur 40 ing of the hot top.
FIG. S is an elevational view of the bottom ring and
pose.
wiper strip assembly of FIG. 4 but with said ring and
Also the present invention contemplates a wiper strip
strip separated and prior to being combined into the
and bottom ring assembly which has manifold manu
facturing and functioning advantages over those previ
unitary assembly.
assembly includes the use of an integrated wiper strip
ring and wiper strip assembly embodying the invention
provides a protection to the refractory bottom rings
lationship prior to being secured together.
FIG. 6 is a sectional view taken substantially on line
ously used or proposed, many of which will later be ex 45
6--6 of FIG. 3 looking in the direction of the arrows.
pressly pointed out.
FIG. 7 is a fragmentary top plan view of va ‘bottom
According to the present invention the bottom ring v
‘but in which the wiper strip means diiîers specifically
means for thc entire periphery and a portion of the lower
face of the bottom ring, as distinguished from the use of 50 in structure from the wiper strip means shown in the
first disclosed form of the invention.
-a plurality of separate wiper strip pieces inserted sepa
FIG. 8 is a sectional view taken substantially on line
rately between the lower end of the hot top casing and
8_8 of FIG. 7 looking in the direction of the arrows.
the upper »face of the ring during the preparation of the
FIG. 9 is a fragmentary sectional view of the embodi
hot top. This wiper strip means can be assembled readily
ment shown in FIG. 7 and is similar to FIG. 3 but is
on and secured to the bottom ring in a simple assembling 55 taken in a slightly diiîerent vertical plane than is FIG.
operation to constitute with the bottom ring a unitary
3, namely, along line 9-9 of FIG. 7 looking in the di
assembly. This can be done in the plant of the manu
rection of the arrows.
facturer of the bottom rings and wiper strips and then
FIG. 10 is a plan View of yone complete element of
the bottom ring assemblies can be handled, shipped,
Vthe wiper strip means and -of a portion of :an adjacent
stored and applied to the hot tops as units with the re 60 and like element of the wiper strip means of the em
sultant advantages incident thereto.
bodiment of FIG. 7 and with said complete element and
The assembly contemplated ‘by the present invention
ysaid adjacent element being illustrated in separated re
against the breaking or chipping of the edges or corners
FIG. ll is a side elevational view of the complete elc
thereof during shipment and storage and during inser 65 ment of the wiper strip means shown in FIG. 10.
tion of the hot tops into the molds.
The unitary as
FIG. 12 is a plan view of a bottom ring and wiper
strip assembly of a different form than those previously
shown but embodying the present invention and wherein
ring protectively by the embracing wiper strip means
the bottom ring is formed of two substantially U-shaped
thereby eliminating the likelihood of re?actory pieces 70 sections with the wiper strip means unitarily Iassembled
or chips of the bottom rings falling into the molds when
with each section and the sections constituting the two
the ring and wiper strip assembly attached to the hot top
assemblies adapted to be separately applied and secured
_is being lowered into the mold and unless the vchips are
to the casing of ‘a large size rectangular hot top, one
removed from the molds, they may cause serious in
section being shown in full lines and the other section
75 in dash lines.
clusions in the metal ingots.
sembly of the bottom rings and wiper strip means has the
advantages of conñning and strengthening the bottom
3,058,182
5
FIG. 13 is a fragmentary broken away top plan view
lowing the molten metal Which- has entered the clearance
space to solidify sufficiently to seal oif additional metal
and illustrates two of the adjacent elements of the wiper
entering and rising in said space when the pouring op
strip means `of the assembly separated from the bottom
eration is resumed.
’
ring section and from each other prior to being inter
As previously stated it has been customary to pro
connected and united with the bottom ring U-shaped
vide a seal in the form of wiper strips which have their
section.
attaching portions clamped in position between the low
FIG. 14 is a detail end elevational view of the wiper
er end of the casing 16 and the upper surface 18a of
the bottom ring 18 and which strips have integral wiper
strip means shown in FIG, 13 and is taken looking at
FIG. 13 substantially from line 14-14 thereof.
10 lips that extend angularly outwardly and upwardly from
FIG. l5 is a plan View showing `an embodiment of
the periphery of the ring ,and contact the wall of the
the invention when used in connection with a round ñut
mold when the hot top is inserted therein and function
to limit the upward ñow of the molten metal in the
ed bottom ring formed of separate segments and with
clearance space between the hot top and the mold wall.
the wiper strip means of the combination integrated with
Heretofore it has been usual to employ a plurality of
each segment and having portions wrapped around the
separate wiper strips, i.e., one for each of the four sides
ends of the segments similarly as in the form shown in
of a rectangular hot top, `and new strips must be posi
FIG. 12, one segment being shown in full lines ‘and the
tioned and used for each pouring operation and this
others in dash lines, and
means increased time in preparing the hot top and ring
FIG. 16 is a view similar to FIG. 12 but illustrates
on a large scale of the embodiment shown in FIG. 12
the invention as embodied in a bottom ring formed of
for each pouring operation.
separate quarter sections, one of which is shown in full
lines and the two 'adjacent sections in dash lines.
The hot top shown in FIG. 1 comprises the usual met
al casing 16 which is illustrated as a two-part casing but
The wiper lip of the wiper strip is dimensioned so it
will tightly contact the inner Wall of the mold when the
hot top is inserted in the mold ‘and will be flexed up
it could be a one-part casing.
The interior of the cas
ing 16 is lined with refractory material which is illus
trated in the form of Íirebrick 17 as lwill be understood
in the art. A refractory bottom ring 18 is secured to
the lower end of the hot top so as to underlie the hot
top casing 16 and the brick lining 17 as will be under
stood in the art.
The hot top in use is positioned in the upper end of
an ingot mold 19 and molten metal is poured into the
wardly 'by such contact since the wiper strip is usually
25 formed of flexible «sheet metal.
The wiper lip of the wiper strip in addition to pro
viding a mechanical seal due to its contact with the mold
wall also has a chilling effect on the molten metal _in
the clearance space that contacts the wiper lip and this
30 facilitates the required solidiñcation of such 4molten met
al during the pause in the pouring operation.
The description heretofore set forth covers conven
tional matters. The bottom ring assembly according to
the present invention will now be described. The Wiper
mold to till the same and provide a quantity thereof in
the hot top to form a sinkhead for a purpose well known 35 strip means of the assembly may be a unitary structure
and extend completely around the periphery of the bot
in the art. The bottom ring 18 has Ian upper planar
tom ring. The wiper strip means may be made as an
surface portion 18a which underlies the lower end of
integral stamping or it may be made of several stampings
the casing 16 and an inner upstanding continuous rib
secured together to form the complete unit as, for in
portion 18h which extends upwardly within the lower
end of the casing 16 and underlies the lower end of the 40 stance, by weldin-g, riveting or otherwise suitably secur
ing the several stampings together. The wiper strip means
refractory lining 17 as is well understood in the art.
preferably is formed of sheet metal, although it could be
The bottom ring is secured to the hot top by means of
formed of other suitable materials.
substantially L-shaped wire attaching clips 20 which
The wiper strip means of the embodiment shown in
have a portion located beneath the bottom ring and pro
FIGS. l to 6 inclusive has 'an attaching and bottom ring
vided at its inner end with an opstanding -leg portion
engaging portion formed of a flange part 22 which ex
20a having a hook at its upper end which engages in
tends beneath and contacts the lower face of the bottom
a recess 18a` formed in the inner periphery `of the bot
ring 18 but is capable of sliding movement thereon. The
tom ring as is well known in the art. The wire attach
flange part 22 is integral with and extends from the lower
ing clips 29 have a second upstanding leg portion 20h
located outwardly -of the outer periphery of the bottom 50 end of a vertically extending part 23 which, when applied
to the bottom ring, contacts closely the outer periphery
ring and casing land provided at its upper end with a
of the bottom ring as clearly indicated in FIG. 2.
hook that engages in a bushing 21 carried by the casing
The flange part 22 and vertical part 23 iit the lower
16 all as is well known. The bottom ring 18 is secured
outer edge of the ring with a fairly close fit and can be
to the casing 16 by a number of the attaching clips 20,
at least four such clips being used depending on the 55 telescoped thereon. At the upper end of the vertical part
23 of the attaching and bottom ring engaging portion
size and shape of the hot top and spaced apart around
of the wiper strip means there is an integral outwardly
the ring `and hot top.
and upwardly inclined or fflared wiper lip 24. The wiper
The casing 16 and bottom ring 18 lare so dimensioned
strip means is applied to or telescoped on the bottom ring
as to be positioned in the mold 19 with clearance space
existing between the outer side of the casing 16 and bot 60 as a unit and is held in position on the bottom ring by
its ñt thereon and by the engagement of upset knobs 25
tom ring 18 and the wall of the mold. The width of
formed in the vertical part 23 of the wiper strip means
this clearance space Will vary since ingot molds, ydue to
in indentations or recesses 26 formed in the outer periph
manufacturing tolerances and other causes, may vary in
`size resulting in “tight” or “loose” fitting molds relative
ery of the bottom ring, or by other cooperating means
to the hot top.
65 interñtting each other and located on the ring periphery
and the vertical part Z3.
When molten metal is poured into the ingot mold the
rise of this molten metal into the clearance space between
The wiper strip means could be heated before applica
the hot top and the mold wall is visually gauged as a
tion to the ring and then cooled to shrink into tight en
rule by the pourer and an error could result in molten
gagement with the ring, and in such event the mechanical
metal coursing up through the space and overflowing 70 interlitting means above referred to might be omitted.
across the top of the mold.
The Wiper strip means and bottom ring 18 may be
In the pouring of the molten metal the pourer usual
formed with any desirable number of cooperating knobs
ly interrupts the pouring operation for a short time in
25 and depressions or recesses 26 and «for purposes of
terval when he estimates that the molten metal is enter
illustration two pairs of the cooperating knobs and de
ing the clearance space. This is for the purpose of al 75 pressions have been shown for each side of the wiper
3,058,182
strip means and bottom ring, although the number could
be lesser or ygreater as required and they can be located
in any desired position. The hot top, bottom ring and
wiper strip means have been illustrated as rectangular, but
it will be understood they might be circular, square or
otherwise shaped.
The wiper strip means can be assembled on the bottom
rings to constitute units therewith by the manufacturer
of the bottom rings and wiper strip means before ship
between the hot top and the inner wall of themold. In
the case of a “loose” mold the vertical part 23 of the wiper
strip means may move closely adjacent to but without
contact with the inner Wall of the mold, while in the in
stance of a “tight” mold there may be contact.
As previously stated, the slots 28 in the vertical part 23
and flange part 22 of the wiper strip means and over
which the attaching clips 20 lie provide clearance for
the outward movement of these parts, it being recalled
ment of the same to the ultimate user, that is the bottom 10 that the portion of the slots 28 in the vertical part 23 is of
protect the lower outer edges of the bottom rings against
chipping, cracking or other damage during shipment, stor
substantial vertical length while the portion of the slots
in the ilange part 22 is shorter and extends horizontally.
Also the ilange part 22 of the wiper strip means has out
ward sliding movement on the bottom face of the bottom
ring when the vertical part 23 moves outwardly as de
scribed. It will also be noted during this rolling action
and the outward movement of the parts 23 and 22 that the
age and handling. Also it will be noted that the wiper
knobs 25 in said part 23 can move outwardly relative to
rings with the strip means mounted thereon can be shipped
as complete unit assemblies.
When the strip means are assembled on the bottom
rings by the manufacturer prior to shipment and prior to
use by the ultimate user, the 4wiper strip means serve to
the recesses or depressions 26 in the bottom ring.
strip means, due to tightly embracing the bottom rings,
From the foregoing it will be seen that when the hot
strengthen the latter in addition to protecting the same 20
top is in 'operative position in the ingot mold the parts 23
and function to retain any cracked portions of the rings
and 22 of the wiper strip means block or substantially
in proper position with respect to the rings.
block entrance to lthe clearance space between the hot
It will be noted that when the bottom ring assembly
of the present invention is secured to the lower end of
top and the mold and hence restrict the flow of molten
the hot .topl the attaching clips 20 extend beneath the 25 metal into such clearance space. However, the molten
metal which may rind its way into the clearance space is
flange part 22 of the attaching portion of the wiper stripy
of reduced volume and is adequately sealed against rising
means and upwardly alongside but outwardly of the ver
tical part 23 thereof and through cutouts or slots 27
-too far in said space or overilowing the upper end of
formed in :the wiper lip 24.
Also the vertical -part 23 and the ñange part 22 of the
the mold by the wiper lip 24 of the wiper str-ip means.
It will be noted that the wiper strip means provides
dual sealing `or restricting points against undesired rising
wiper strip means at their `ang-le of interconnection are
of the molten metal in the clearance space between the
provided directly below the slots 27 with slots 2S, the
hot top and mold `and spaced apart vertically of the hot
vertical portion of which extends a substantial distance
top and thus efficiently protects against the danger of hot
upwardly of the vertical part 23 from the lower end there
35 top “stickers” o-r “hanger” ingots.
of for a purpose later to be explained.
In order to increase the flexibility of the wiper lip, par
ticularly at the corners thereof, said lip may be provided
with slits 29, four of which are indicated in FIG. 4, but
it will be understood that the number of slits 29‘ may be
Furthermore, the Wiper «strip means of the bottom ring
assembly of the present invention in addition to providing
a more eiiicient mechanical seal itself, has the further ad
vantage of facilitating ‘the required degree of solidiñcation
increased as is found desirable. Inasmuch as the wiper 40 of the molten metal adjacent to or in the clearance space
between the hot top and »the mold during the momentary
strip means is applied as a unit to the bottom ring, its
pause 'in «the pouring operation, since the parts 22 a-nd 23
of the wiper strip «mean-s engaging such molten metal in
addition to any engagement thereof by the wiper lip 24
lower edge and corners thereof.
Referring now to FIGS. 1 and 2 wherein the bottom 45 increases the chilling eñect of the vviper strip means on
-ring assembly is shown secured to the lower end of a
the molten metal.
hot top and the latter is starting its insertion movement
It will be noted that should the hot top be misaligned
linto the mold 19, it will be noted that the wiper lip 24
with the mold opening during the lowering of the hot
of the wiper strip means is of a length t0 overlie some
top into the mold, the wiper strip means of the assembly
what the upper end of the mold. The vertical part 23 of 50 protects the refractory bottom ring against damage
the wiper strip means acts to Ifacilitate, and guide the in
through inadvertent contact with the mold. In addition,
the wiper strip means prevents chips, or broken pieces
sertion of the hot top into the mold and with the flange
part 22 thereof protects the refractory ring.
of fthe bottom ring from falling into the mold and un
Now assuming that the hot top has moved into the
less removed `from the mold causing inclusions in the in
mold 19 from the position shown in FIG. 2 toÁ that shown 55 got.
in FIG. 3, it will be noted that the engagement of the
Reference is now made to FIGS. 7 to 11 inclusive
wiper lip 24 `of the wiper strip means with the mold has
wherein is shown a bottom ring assembly embodying
flexed said wiper lip upwardly and that its free end is
the invention but differing somewhat in structure from
the bottom ring assembly previously described.
engaging the inner wall »of the mold to provide a seal.
Although the wiper lip 24 ilexes at the junction between 60
The hot top illustrated fragmentarily in FlG. 9 may
be of the same construction as the hot top illustrated in
its inner end and the upper end of the vertical part 23
FIGS. l to 3 inclusive and hence the portions of the hot
of the wiper strip means, this angular junction has ia sub
correct positioning on the bottom ring is assured and it
provides protection for the bottom ring including the outer
stantial measure of stiifness. Therefore the flexing of the
top shown in FIG. 9 are identified Aby the same reference
numerals as are `the corresponding portions of the hot
and the vertical part 23 to have a rolling »action on the 65 top of FIGS. 1 to 3 inclusive. Insofar as the refractory
vwiper lip 24 causes the angular junction between the lip
periphery of the bottom ring 18 and this rolling action
causes the vertical part 23 to move outwardly from the
bottom ring of the bottom ring and wiper strip means as
sembly shown in FIGS. 7 to l1 is identical with the pre
viously described bottom ring the lsame reference nu
vertical position of FIG. 2 to the inclined position of
merals used to identify lthe different portions of the bot
FIG. 3. This movement of the vertical part 23 of the
wiper strip means causes the lower end of said part 23 70 tom ring.
The wiper strip means of the bottom ring assembly of
and the outer end of the flange part 22 to move outwardly
FIGS. 7 to l1 inclusive comprises a plurality of separate
toward the inner wall of the mold as clearly indicated in
identical elements which are secured together to provide
FIG. 3. Consequently the vertical part 23 Äand llange part
a unitary wiper strip means that is applied and is secured
.22 at this time present a block or a substantial block to
as a unit to the bottom ring and surrounds «the periphery
the entrance of molten metal into the clearance space
3,058,182
9
of the bottom ring and extends beneath the lower face
thereof.
-Each of the separate elements of the wiper strip means
now being described has an attaching and bottom ring
engaging portion formed of a vertical part 30 which lies
against the outer periphery of the bottom ring and an in
tegral inwardly extending flanged part 31 which underlies
and contacts the lower face of the bottom ring. The
vertical part 3@ of each element is provided `at its upper
edge with an integral outwardly and upwardly inclined
or flared wiper lip 32. The vertical part 30l of each
element is provided at its opposite curved ends with ex
tended curved tabs 33 and 33a. When the elements of
the wiper strip means are assembled together the tabs
33a of the elements will `overlie the tabs 33 of adjacent
elements.
stantia-l distance upwardly of said part from the lower
edge thereof and are longer than the portions of the slots
3S that are in the flange parts 31. In addition, the wiper
lips 32 may be provided with slits 39 to further increase
t‘ne flexibility of the wiper lips. Although these slits
39 are illustrated as being -two in number for each sec
tion and as located adjacent the curved opposite ends 32a
Iof the wiper lip sections so as to position said slits 39
adjacent to the corners of the bottom ring assembly, it
will -be understood that »additional slits corresponding to
the slits 39 'can be provided in the wiper lips 32 if de
sired and at other locations.
It was previously stated that the curved opposite ends
32a of the wiper lips of the sections have overlapping
relationship land since these curved ends ‘are not inter
locked against relative movement, the flexibility of the
The tabs 33a of each element are provided with one
or more lbut‘ton~'lil§e nipples 34 which contact the tabs 33
wiper lips at the curved ends is not .restricted yand is rela
of the adjacent elements.
in number and as being located adjacent the upper end
of the part 30 and as being vertically spaced apart. The
the loverlap-ping tabs 33 and 33a of the vertical parts
3l? ‘of the wiper strip means are secured together prefer
ably »adjacent »to the upper edge of said parts 30 the
wiper strip unit at the corners thereof will have the
illustrated arrangement is a desirable one for a purpose
required measure of freedom or adaptability so that
For purposes of illustration the
button-like nipples 34 on the tabs 33a are shown as two
tively free, particularly in -view of the slits 39. Also since
later to be explained but it will be understood that the
under the rolling action later «to be referred -to of the
button-like nipples may vary in number and location 25 junction between «said vertical parts 30 and wiper lips
from the illustrated showing thereof.
32, said parts 30 can move outwardly into the oleanance
space -between the bottom .ring and the mold. Also dur
The elements of the wiper strip means are assembled
ing such movement the flange parts 3l can move out
together in a suitable jig or fixture so that the tabs 33a
w-ardly along the bottom face of the »bottom ring as in
overlie the tabs 33 of adjacent elements while the curved
opposite ends 32a of the wiper lip 32 of each element over 30 the previously described form.
It will »be understood that when a hot top with the
lie in one instance and underlie in the other instance the
curved opposite ends 32a of the wiper lip 32 of adjacent
bottom ring and wiper strip assembly of the construction
elements as clearly shown `in FIG. 7 and can have move
ment relative to each other when the strip means tlexes.
shown in FIGS. 7 through 1l secured to the lower end
of its casing is inserted into a mold and the wiper lips
32 thereof contact the mold, said lips 32 will be llexed
upwardly and at »the same time a rolling action against
The opposite ends of the flange parts 31 of the elements
are beveled to interñt with the en'ds of the flange parts
31 of adjacent elements. The overlapping tabs 33a and
33 are then secured together preferably by electric weld
ing at the location of the nipples 34, although they could
the periphery ofthe bottom ring will yoccur on the ‘fulcrum
at the junction between the wiper lips 32 and the upper
edge of the vertical parts 3G and cause said vertical parts
be secured together by other suitable means as, for in 40 and also said flange parts 31 to move outwardly with re
spect to the bottom ring to block or substantially block
stance, by riveting. When the tabs 33a and 33 are se
the entrance to the clearance space between the hot top
cured together as by electric welding as indicated in FIG.
and lthe mold for the same purpose :and with the same
8, the nipples 34 of the tabs 33a are fused into the metal
advantages as have been pointed out with reference to
of the overlying tabs 33a and 33.
It will be seen that when the tabs 33 and 33a are se
cured together the separate elements of the wiper strip
means are then united into» a single unit which can be
rtw
applied and secured as such to the bottom ring of the
bottom ring assembly. If the bottom ring is of rec
tangular configuration for use on the lower end of a rec~
tangular hot top, then the secured together tabs 33 and
33a are located at the corners of the wiper strip means
unit and of the bottom ring. The Wiper strip means unit
the description of the embodiment of the invention shown
45 in FIGS. 1 through 6.
'In FIGS. l2, 13 and 14 a further embodiment of the
invention is illustrated. In the case of large size hot
tops as, for instance, large size rectangular hot tops, it
has been customary to have the bottom rings formed
of separate section-s as, Ifor instance, two substantially
U-sha-pe-d sections, which are secured to the lower end
of the casing of the hot top and combined extend corn
pletely -around said lower end of the casing. This type
of arrangement is shown in FIG. l2 wherein one of the
will tightly ñt and surround the periphery of the bottom
ring as in the previously described form and the ñange 55
substantially U-shaped bottom ring sections is indicated
parts 31 will underlie Vand contact the lower face of the
at 40 in `full lines `and the other substantially U~shaped
bottom ring but will be capable of movement thereon.
section 40 is yfragmentarily shown in dash lines.
When the wiper strip means is positioned on the bottom
Each bottom ring section 40 is provided with the raised
ring >then by means of a suitable upsetting operation the
rib
18b on its upper side and with the att-aching clip
secured together tabs 33 and 33a »are deformed or pressed 60
recesses 18e as in the previously described bottom rings.
inwardly to provide portions 35 that ex-tend into re~
The `outer periphery of the bottom ring sections 46 is
ceases 36 formed in the periphery of the bottom ring and
which recesses, if the bottom ring ds rectangular, will be
illustrated as provided with curves or waves.
Each bottom ring section 40 has assembled and in
at the corners thereof or at some other suitable loca
Itegrated therewith three sections of a wiper strip means,
tion.
65 with the two sections of said means that are on opposite
The wiper lips 32 of the wiper strip means are provided
sides of the bottom ring being identical in construction,
with slots 37 through which the portions 29h of the
while the end section of said wiper strip means differs
attaching clips 30 can extend. Also the vertical part
somewhat in structure from the other two as will soon
30 and the flange part 31 of the wiper strip means are
bcome apparent.
provided at their junction with cutouts or slots 38 ver
All of the sections «of the wiper strip means have an
tically aligned with the slots 37 and similar in purpose to
attaching and bottom ring engaging portion comprising a
the slots >or cutouts 28 of the form »of the invention de
flange part 41 which extends beneath and contacts the
scribed with reference to FIGS. l through 6 inclusive;
lower face of the «bottom ring section :and a vertical part
it being noted that the portion of the slots 38 in the
42 integral with the flange part and extending vertically
vertical par-t 30 of the wiper strip means extend a sub 75 of the periphery of the bottom ring section as will be
3,058,182
i 11
understood from the description of the previously de
»the bottom lring'section but allow «the parts 42 and 41
scribed forms of con-struction. The upper edge of the
to move when the part 42 is rocked. The portions 42a
on their lower edge have an integral flange 42d which
vertical part 42 has the integral outwardly flared wiper
lip 43 extending therefrom. The vertical par-t 42 and
the wiper lip 43 are provided with waves or curves
corresponding to the contour of the periphery of the bot
tom ring section.
»In order to provide suñicient flexability in the wiper
lip 43, particularly in view of its wavy configuration, said
lip is provided with a plurality of spaced slits 44. Also
the wiper llip 43 is provided with cutouts 45 through
which Ithe attaching clips (not shown in FIGS. 12 and
extends horizontally beneath the flange part 41 of the
wiper `strip means. The flange 42d is oiîset Ito interñt the
flange part 41, but beyond the offset the flange 42d con
tacts the underside of the bottom ring section 40. The
iiange 42d may tbe secured to the flange part 41 of the
wiper strip means by spot Welding the same thereto as
lO indicated in FIG. 13 or by any other suitable securing
means.
It will be understood that each bottom ring section 40
has assembled therewith a wiper strip means formed of
the two side sections and the end section in a manner pre
viously described. Also it Will be understood that the as
13) can extend as will -be well understood.
In vertical «alignment with the cutouts 45 the flange
part 41 and vertical part 42 of the wiper strip means
are provided with slots 46 with .the longer portion of
the slots >46 being in »the vertical part 42 las Was the
case of the slots 28 -and 38 in the previously described
forms. It will ‘be understood that the purpose of the
sembled bottom ring and Wiper strip section is secured by
the attaching clips to the lower end of the hot top casing
and the free ends of said assembled bottom ring and
wiper strip section abut the free ends of an identical sec
slots 46 is the same as lthe previously referred to slots 20 tion that is similarly secured to the hot top to form a
complete bottom ring and wiper strip assembly on the
28 and 38.
The section of the wiper strip means for the closed
lower end of the hot top.
This is indicated in FIG. 12
end of the substantially U-shaped bottom ring section
by the one bottom ring and wiper strip assembly section
40 is provided at its opposite ends fand on the vertical
shown in full lines and the other such section shown in
part 42 thereof with projecting tabs 47. The vertical 25 dash lines.
parts 42 of the side sections of the wiper strip means
It will further be understood that the bottom ring and
'are provided .at «the ends of said sections which are ad
wiper strip assembly of the form shown in FIGS. 12
jacent yto the opposite ends of the end section of the
through 14 and embodying the invention when secured to
wiper strip means with projecting tabs 4S. When »the
a hot top cooperatively with another such assembly and
Wiper strip means sections are assembled together the 30 the hot top is inserted into an ingot mold, the wiper lips
>tabs 47 and 48 overlap and are secured together by suit
43 will engage the mold and a rolling action against the
able means as, ‘for instance, one or more welds similarly
periphery of the bottom ring sections will occur to cause
to the tabs 33 .and 33a of the embodiment shown in
FIGS. 7 to 11 inclusive.
t-he vertical part 42 and the iiange part 41 of the wiper
strip means to move outwardly and block or substantially
rFhe opposite curved ends 43a of the wiper lip 43 of 35 block the entrance to the clearance space between the hot
the end section of the wiper strip means slidably over
top and the mold just as in the previously described
lap the adjacent curved ends 43b of the wiper lip 43
forms, it being recalled that the loose engagement of the
of the side sections of the wiper strip means. When
tab 42e` in the vertical recess 52 permits this movement.
the united end and side sections of the wiper strip means
Inasmuch as the wiper lips are provided with slits 44
are assembled with athe U-shaped bottom ring section 40 and the cutouts 45, the wiper lips will have flexibility,
40 the flange parts 41 of the wiper strip means sections
particularly if the slits 44 are located so as to interrupt
underlie and contact the »bottom face of the lbottom ring
the continuity of the curves in the wiper lips. Also since
section while the vertical parts 42 of the wiper strip sec
the overlapping curved ends of the wiper lips of the side
tions follow the contour of and contact the periphery of
sections and those of the end section are free to have
the 4bottom ring section 4t). The overlapped and secured , limited relative movement, the ñexibility of the wiper
together tabs 47 and 48 overlie the end corners 49 of
lips at the corners of the bottom ring and wiper lip as
Athe bottom ring section 4t). The bottom rin-g section
sembly is not unduly limited.
40 on opposite sides of the corners 49 thereof is pro
In FIG. 15 another embodiment of the invention is il
vided with recesses 50 and 4the vertical parts 42 of the
lustrated. This embodiment is adapted to be used with
side and end sections of the wiper strip means are crimped
a circular bottom ring that is formed of segmental sec
or deformed -to have portions ‘50a extending into the re
tions and which has its outer periphery of convoluted
cesses 50.
shape. One of the segmental sections of the bottom ring
In order to secure the free ends of the side sections
is shown in full lines in the plan view of FIG. 15 while
1of the wiper strip means to the free ends of the U-shaped
the two adjacent segmental sections are indicated in dash
bottom ring sections 40 said side sections can be said - lines.
to -be wrapped around the free ends of the bottom ring
`In FIG. 15 the upper surface of the bottom ring seg
sections. The arrangement for doing this will now be
ments is indicated at 53 and each segment is provided
described.
with a substantially arcuate upwardly extending rib 181;
The yfree ends of the bottom ring sections 46 .are pro
vided in their upper surfaces with recesses 51 that extend
»from Vthe periphery of the bottom »ring transversely to
and has the recesses 18e for the hooks on the inner ends
60 of the attaching clips not shown. The wiper strip means
that is assembled and integrated with each ybottom ring
segment has an attaching and bottom ring engaging por
ward the rib 1gb thereof and which recesses have a hori
zontal supporting or engaging sur-face. The free ends
'of the bottom ring sections also are provided iat the
inner ends of the recesses 51 and communicating there
with with vertical recesses 52.
l
tion formed of a flange part 54 contacting the under sur
face of the bottom ring segment and a vertical part 55
. that is convoluted to conform to and engages the periph
The vertical parts 42 -a-t the ‘free ends of the side sec
tions of the wiper strip means are extended -and turned at
right angles to provide integral portions 42a which bear
against the vertical free end surfaces of the «bottom ring
section 40. The por-tions 42a on their upper edge have
integral horizontal tabs 42h which fit into the recesses
51 in the bottom ring section and bear on the horizontal
`supporting surfaces thereof. The portions 42a at vtheir
fre-e ends have integral vertical tabs 42a` whi-ch loosely
extend into the vertical recesses 52 in the 'free ends of 75
ery of the bottom ring segment just as in the previously
described forms.
The upper edge of the vertical part 55 of the wiper strip
means is provided with the integral flared 4wiper lip 56.
The wiper lip 56 has the slots S7 for the attaching clips
and said slots 57 are shown as located in the crest of the
convolutions of the wiper lip 56. Also the curves of the
wiper lip 56 are interrupted by one or more slits 58 which
with the slots S7 provide the requisite ñexibility for the
Wiper lip.
3,058,182
13
14
The opposite ends of the wiper strip means for each
segmental bottom ring section are wrapped around and
including an attaching portion having a horizontal flange
slidably contacting the lower face of the bottom ring and
are secured to the opposite ends of said bottom ring seg
a vertical part integral with said llange and tiltably en
ment in the same manner as are the free ends of the
gaging the outer periphery of the bottom ring and from
the upper edge of which extends angularly outwardly and
upwardly an integral wiper lip adapted to be ilexed up
wiper strip means with respect to the free ends of the bot
tom ring sections in the form shown in FIGS. 12 through
14.
Each bottom ring segment 53 on its periphery is pro
yWardly by engagement with the mold wall, said flange vand
said vertical part being provided With interconnecting
vided with a suitably located recess or recesses 59 and the
openings located to be in the vertical plane that includes
vertical part 55 of the wiper strip means is crimped or 10 the attaching clips which secure the unit assembly to the
upset into said recesses 59 as indicated at 60. It will be
hot top casing, whereby when the unit assembly is at
understood that the bottom ring segments each have as
tached to a hot top and the latter is inserted in an ingot
sembled therewith the wiper strip means and these assem
mold and the wiper lip is flexed upwardly said vertical part
blies are separately attached to the lower end of the hot
tilts on the ring periphery at the junction of said wiper lip
top casing so as to extend completely therearound with 15 and said part to cause said ñange to slide on the lower
the ends of each assembly abutting the ends of adjacent
face of said ring into the clearance space between the hot
assemblies. It will also be understood that the flange
top and the mold wall at a location spaced inwardly of
part 54 and vertical part 55 of the wiper strip means are
the mold from wiper lip engagement with said wall.
provided with L-shaped slots 61 similar to the previously
Z. A bottom ring and wiper strip unit assembly for a
described slots 28, 3S and 46 and for the same purpose.
20 “lloating” composite hot top for an ingot mold as deñned
It will further be understood that when a hot top hav
in claim l and wherein Said wiper lip is provided with at
ing secured thereto the circular bottom ring shown in
taching clip slots and the said openings in the vertical
FIG. 15 is inserted into a mold and the wiper lip 56 is
part of said Wiper strip means are elongated upwardly to
ñeXed by its engagement with the mold wall, the rolling
ward said wiper lip whereby when the unit assembly is at
action of the junction between the wiper lip 56 and the 25 tached to a hot top and the latter is inserted in an ingot
vertical part 55 takes place against the periphery of the
mold and the wiper lip is flexed upwardly said vertical
refractory bottom ring and causes said vertical part 55 and
part tilts through a substantial angle on the ring periphery
flange part 54 to move outwardly toward the wall of the
at the junction of said wiper lip and said part notwith
mold to block or substantially block the entrance to the
standing the presence of attaching clips to cause said
clearance space between the hot top and the mold.
30 ñange to slide on the lower face of said ring a substantial
In FIG. 16 a further embodiment of the invention is
distance into the clearance space between the hot top and
illustrated. Here there is shown a portion of a large
the mold wall at a location spaced inwardly of the mold
size rectangular bottom ring made up of quarter sections,
from wiper lip engagement with said wall.
one of which is shown in full lines while the two adja
3. A bottom ring and wiper strip unit `assembly for a
cent ones are fragmentarily indicated in dash lines. Each 35 “lloating” composite type hot top for an ingot mold and
bottom ring section is substantially L-shaped and the up
comprising a refractory bottom ring adapted to be secured
per surface thereof is indicated at 62. Each bottom ring
to the hot top metal casing `by attaching clips, and sheet
section has the raised rib 18h and the recesses 18C for the
material wiper strip means mounted on and united with
attaching clips as in the previously described forms.
said bottom ring as a unit assembly therewith and formed
Each bottom ring quarter section has assembled there 40 of a plurality of separate sections conjointly embracing
on a quarter or substantially L-shaped wiper strip means
the periphery of the ring, each section including an at
section. Each wiper strip means section has an attaching
taching portion having a horizontal flange slidably contact
and bottom ring engaging portion including a ñange part
ing the lower face of the bottom ring and a vertical part
63 that contacts the underface of the bottom ring sec
integral with said flange and tiltably engaging the outer
tion and a vertical part 64 that engages the periphery of 45 periphery of the bottom ring and from the upper edge of
the bottom ring section. The vertical part 64 has inte
which extends angularly outwardly and upwardly an in
gral with its upper edge the ñared wiper lip 65. This
wiper lip 65 is sloted as at 66 for the attaching clips and
has a number of spaced slits 67 therein to provide ñeXibil
ity for the wiper lip, one of said slits being at the corner 50
of the wiper strip means section as illustrated in FIG. 16.
The opposite ends of each wiper strip means section are
wrapped around and secured to the opposite ends of each
tegral wiper lip adapted to be llexed upwardly by engage
ment with the mold wall, said llange and said vertical part
of each section being provided with interconnecting open
ings located to be in the vertical plane that includes the at
taching clips which secure the unit assembly to the hot top
casing, whereby when the unit assembly is attached to a
hot top and the latter is inserted in an ingot mold and the
wiper lips of the sections are flexed upwardly said vertical
ends of the wiper strip means sections in the forms shown 55 parts tilt on the ring periphery at the junction of said
in FIGS. 12 through 15. Each bottom ring quarter sec
wiper lips and said parts to cause said ñanges to slide on
tion in each arm or leg thereof is provided on its periph
the lower face of said ring into the clearance space be
ery with one or more recesses 68 into which the vertical
tween the hot top and the mold wall at a location spaced
part 64 of the wiper strip means is crimped or upset as
inwardly of the mold froml wiper lip engagement with
indicated at 69.
said wall.
The embodiment of the invention shown in FIG. 16
4. A bottom ring and wiper strip unit assembly for a
functions in the same way and with the same advantages
“floating” composite type hot top for an ingot mold and
as do the previously described embodiments.
comprising a refractory bottom ring adapted to -be se
Although a number of different embodiments of the
cured to the hot top metal casing by attaching clips, and
invention have been illustrated and described herein, it
sheet material wiper strip means mounted on and united
will be understood that the invention is susceptible of
with said bottom ring as a unit assembly therewith and
various modiñcations and adaptations within the Scope of
including an attaching portion having a horizontal flange
the appended claims.
slidably contacting the lower face of the bottom ring and
Having described our invention we claim:
a vertical part integral with said ñange and tiltably en
1. A bottom ring and wiper strip unit assembly for a
gaging the outer periphery of the bottom ring and from
“floating” composite type hot top for an ingot mold and
the upper edge of which extends angularly outwardly and
comprising a refractory bottom ring adapted to be se
upwardly an integral wiper lip adapted to be flexed up
cured to the hot top metal casing by attaching clips, and
wardly by engagement with the mold wall whereby when
sheet material wiper strip means mounted on and united
the unit assembly is attached to a hot top and the latter
with said bottom ring as a unit assembly therewith and 75 is inserted in an ingot mold and the wiper lip is llexed
bottom ring quarter section in the same manner as are the
3,058,182
16
15
upwardly said vertical part tilts on the ring periphery at the
junction of said wiper lip and said part to cause said
end portions arranged in overlapping relationship and se
-ilange to slide on the lower face of said ring into the clear
jacent sections, the projections of said Vertical parts which
cured to similar end portions of the vertical parts of ad
ance space between the hot top and the mold wall at a lo
extend into the said recesses in the periphery of the ring
cation spaced inwardly of the mold from wiper lip en
gagement with said wall.
5. A bottom ring and wiper strip unit assembly for a
“ñoating” composite type hot top for an ingot mold and
being formed in the overlapping end portions of said
parts.
9. A bottom ring and wiper strip unit assembly for a
“iloating” composite type hot top for an ingot mold as de
comprising a refractory bottom ring adapted to be se
íìned in claim 8 wherein said wiper lips are provided with
cured to the hot top metal casing by attaching clips, and
attaching clip slots and said vertical parts extend upwardly
sheet material wiper strip means mounted on and united
with said Abottom ring as a unit assembly therewith includ
to close proximity to the upper face of the ring and the
openings in said vertical parts are elongated upwardly
from the interconnecting openings in said flanges toward
said wiper lips, whereby when the unit assembly is at
ing an attaching portion having a horizontal flange slid
ably contacting the lower face of the bottom ring and a
vertical part integral with said ñange and tiltably engag
Iing the outer periphery of the bottom ring and from the
upper edge of which extends angularly outwardly and up
wardly an integral wiper lip adapted to be iiexed upwardly
«by engagement with the mold wall, said ring being pro
tached to a hot top and the latter is inserted in an ingot
mold and the wiper lips are flexed upwardly said vertical
parts tilt through a substantial angle on the ring periphery
at the junction of said wiper lips and said parts and due to
the lever length of said parts cause said lianges to slide
vided on its periphery with recesses and said vertical part 20 on the lower face of said ring a substantial distance into
the clearance space between the hot top and the mold
'being provided with projections movably extending into
wall at a location spaced inwardly of the mold from wiper
said recesses, said ñange and said vertical part being pro
vided with interconnecting openings located to be in the
vertical plane that includes the attaching clips which se
cure the unit assembly to the hot top casing, whereby
‘when the unit assembly is attached to a hot top and the
latter is inserted in an ingot mold and the wiper lip is
ilexed upwardly said Vertical part tilts on the ring periph
ery at the junction of said wiper lip and said part to cause
said flange to slide on the lower face of said ring into the
clearance space between the hot top and the mold wall at
lip engagement with said wall.
'
l0. A bottom ring and wiper strip unit assembly for
a “ñoating” composite type hot top for an ingot mold and
comprising a refractory bottom ring adapted to be secured
to the hot top metal casing by attaching clips, said bottom
ring being formed of a plurality of separate sections
shaped to conjointly interñt the lower end of‘the hot top,
and sheet material wiper strip means mounted on each
ring section as a unit assembly therewith and including an
attaching portion having a horizontal ñange slidably con~
tacting the lower face of the ring section and a vertical
a location spaced inwardly of the mold from wiper lip
engagement with said wall.
6. A bottom ring and wiper strip unit assembly for a
“floating” composite type hot top for an ingot mold as de
part integral with said ilange and tiltably engaging the
fined in claim 5 and wherein said sheet material wiper
edge of which extends angularly, outwardly and upwardly
outer periphery of the ring section and from the upper
an integral wiper lip adapted to be flexed upwardly by en
strip means is an integral stamping interñtting and ex
gagement with the mold wall and provided with attaching
tending around the outer periphery of the ring and engag
clip slots, each of said ring sections and said Vertical parts
ing the lower face of said ring.
7. A rbottom ring and wiper strip unit assembly for a 40 >of the wiper strip means having interengaging but rela
tively movable portions maintaining the wiper strip means
“floating” composite type hot top for 'an ingot mold as de
assembled on the ring sections to be attached as a unit
lined in claim 5 and wherein said wiper lip is provided
therewith to the hot top but with said vertical parts tree
with attaching clip slots and said vertical part extends up
to have tilting movement on the ring sections about the
wardly to close proximity to the upper face of the ring
and the said openings in the vertical part of said wiper 45 fulcrum at the junction between the upper edge of said
Yvertical parts and the wiper lips, said ilanges and said
Vstrip means are elongated upwardly toward said wiper lip,
vertical parts being provided with interconnecting open
Vwhereby when the unit assembly is attached to a Vhot top
ings in the vertical plane that includes said slots whereby
and the latter is inserted in an ingot mold and the wiper
lip is llexed upwardly said vertical part tilts through a 50 when the assembly is attached to a hot top and the latter
is inserted in an ingot mold and the wiper lips are flexed
substantial angle on the ring periphery at the junction of
upwardly said vertical parts tilt on the ring periphery to
said wiper lip and said part and due to the lever length
cause said ñanges to slide on the lower faces of said ring
of said part causes said flange to slide on the lower face
sections into the clearance space between the hot top and
of said ring a substantial distance into the clearance space
between the hot top and the mold wall at a location 55 the mold wall at a location spaced inwardly of the mold
spaced inwardly of the mold from wiper lip engagement
with said wall.
Y
from the wiper lip engagement with said wall.
'
8. A bottom ring and wiper strip unit assembly for a
“floating” composite type hot top for an ingot mold as de
‘lined in claim 5 and wherein said sheet material wiper
strip means is formed of a plurality of separate sections
conjointly embracing the pheriphery of the ring, each sec
tion including said horizontal ilange, said vertical part and
Said Wiper lip; the vertical parts of said sections having
References Cited in the tile of this patent
UNITED STATES PATENTS
2,258,483
2,300,077
Charman ____________ __ Oct. 7, 1941
Urmetz ______________ __ Oct. 2.7, 1942
2,426.748
Rees et al. \__,__,__v_,._.„r„__„ Sept. 2, 1947
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