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Патент USA US3071839

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Jan. 8, 1963
Filed Aug. 19, 1960
2 Sheets-Sheet 1
Riga/114e,! w
AT TOR/V5715
Jan. 8, 1963
Filed Aug. 19, 1960
2 Sheets-Sheet 2
United States Patent O?tice
Patented .lan. 8,1963
Hitherto, a shear pin has been provided in conventional
Thomas Joseph Corcoran, Miami, Fla., assignor to Miami
Herald PuhlishingCompany, Miami, Fla, a corpora
tion of Florida
Filed Aug. 19, 1960, Ser. No. 50,639
10 Claims. (Cl. 22—2)
stereotype plate-casting machines for interrupting the
drive between the motor and the movable mold half,
which shear pin is intended to be sheared off when the
5 mold “hangs up” in this manner and spill-out occurs, as
a result of the continued operation of the driving motor.
The severing of the shear pin between normallyrelatively
movable machine parts now permits such relative motion
to move a cam'which actuates a switch controlling the
This invention relates to stereotype plate casting ma 10 energization
of the driving motor. This converitiorial
chines and, in particular, to spillout prevention devices for
safety feature, however, is not su?icient to prevent a masf
such machines.
sive spill-out of molten type metal through the‘ gap or
Heretofore, extensive use has been made in the news
paper printing industry and in other branches of the print
ing industry of ‘so-called metal stereotype plates which are
cast in partially cylindrical form from stereotype matrices
of special tough stiff paper upon which the impressions
of the typed or electrotyped material has been impressed
from contact with ?at electrotype plates and type say
from a conventional line-casting machine. The substan
tially ?at stereotype mat or matrix produced by these con
ventional processes and bearing the typed or electrotyped
impressions is then curved or bent into partially cylindrical
form when it is placed in a stereotype plate~casting ma~
chine and molten type metal poured into the mold cavity
‘ in order to cast a partially cylindrical printing plate
crack between the mold halves because of the momentum
of the moving parts of the pump, which causes the pump
to continue pumping for an additional short time su?’i
cient to cause considerable spill-out.
As an additional safety device for attemptedly reducing
the damaging eli'ect of spill-out, the molten metal pumpgof
the conventional stereotype’ plate-casting machine is pro
vided with a bypass valve and bypass conduit operative to
bypass the molten metal discharged from the pump
directly back into the cauldron without permitting it to
be ejected through the molten metal feed conduit into the
mold cavity. A hand lever operatively connected ‘to the
stem or shaft of this bypass valve can be'actuated by the
machine operator to cause bypass of the molten metal
bearing the printed matter and illustrations which have
when spill-out occurs. The effective operation of this
been impressed upon the stereotype mat. Such stereotype
manually-operated bypass valve, however, depends entire~
plate-casting machines enable the rapid and inexpensive
ly on the vigilance of the operator and upon the chance
production of multiple cylindrical printing plates from a 30 that he will detect spill-out as soon as it commences and
single stereotype mat produced from a single assembly of
instantly shift the bypass valve to halt the further ?ow
line-casting machine typed matter and electrotypes of
of molten metal into the mold cavity. Such vigilance on
illustrations. Such stereotype plate casting machines have
the part of the operator is rare, however, and in actual
reached a high degree of development over the past 50
practice the manually~operated bypass valve is ine?ective
years and now operate automatically or semi-automatical
to bring about bypass of the flow of moltenmetal until
ly to turn out the partially cylindrical printing plate which
many pounds of molten metal have been spilled from the
can then be placed immediately upon the printing press
mold cavity before the incomplete closing of ‘the mold
and the newspapers or other printed matter run off at
halves has been detected by the operator. Even when
high speeds.
such an eventuality has been detected, the reaction time
One expensive and time-consuming accident which 40 of the operator still further delays the manual shifting
occasionally arises in the use of conventional stereotype
by him‘ of the bypass valve.
plate-casting machines is so-called “spill-out” or acci
The present invention eliminates or reduces to a negli
dental discharge of molten type metal into the mechanism
gible amount such spill-out resulting from incomplete
of the machine. The conventional stereotype plate~cast~
closing of the mold halves from Whatever cause, by pro
ing machine includes a heated cauldron which contains
viding instant and automatic operation of the bypass valve
molten type metal. A pump‘ for molten metal is sus~
and consequent substantially immediate termination .of
pended in the cauldron beneath the level of the molten
type metal andthas a shaft driven by an electric motor
to pump molten metal from the cauldron through a feed
the further ?ow of molten metal to the mold cavity. The
mold cavity.
is spilled, thereby saving much time, labor and expense
spill-out prevention device of‘the present invention, more
over, operates so rapidly that bypass of the molten metal
conduit into the partially cylindrical mold cavity between
from the delivery side of the pump back into the cauldron
the two relatively-movable mold halves known as the 50 occurs almost instantaneously with the occurrence of in
“cylinder” and “ring.” The stereotype mat or matrix is‘
complete mold closing, with the result that a negligible
bent into partially cylindrical’ form and placed in this
amount of molten type metal, of the order of one pound,
When the mold- halves have been‘ closed- ‘
by the operation of the electric motor and the pump is
otherwise necessitated by the removal of large amounts
operated, molten metal‘?ows intotthe mold cavity to cast‘ 55 of solidi?ed type metal from the mechanism of the stereo
a partially cylindrical printing plate upon which is repro-‘
type plate-casting machine.
duced the printing or illustrated matter‘ impressed on‘the
Accordingly, one object of this invention is to provide
stereotype mat.
a spill-out prevention device for stereotype‘ plate-casting
Occasionally, however, a metal chip or other foreign
machines which will automatically and substantially in
matter accidentally gets in between the mold halves of this 60 stantaneously operate a pump bypass valve almost im
machine, preventing them from completely closing and‘
mediately upon the occurrence of incomplete'mold clos
thus holding them apart slightly while the molten metal
ing, without the necessity for vigilance or attention there
continues to be pumped into the mold cavity. Asa result,‘
to on the part of the operator.
some of the molten metal spills out through the crack
Another object is to provide a spill-out prevention de
or gap between themold halves'and flows into the mecha-' 65 vice of the foregoing character which is actuated electri
nism of the machine, where it solidi?es and has to ‘be dug
cally in response to the severance of the shear pin be
out by hand.‘ Such an accident not only requires the ma
tween the machine elements interconnected by 'the shear‘
chine to be shut down for several hours or more in order
pin so as to energize an electrically-responsive actuator
to remove the solidi?ed metal from the mechanism, but‘
for the pump bypass valve and thus terminate at once the
alsoinvolves- the expenditure ‘of expensive labor inre
‘further flow of molten metal into the mold cavity.
moving the spilled metal.
Another object is to provide a spill-out prevention de
vice of the foregoing character wherein the device in
to the movable mold component or “cylinder” 42, to
cludes an electromagnetic motor operatively connected to
the bypass valve operating rod or shaft and energized in
move back and forth on a suitable carriage (not shown)
response to the operation of a switch actuated by the rela
tive motion between the shear-pin-connected parts upon
severance of the shear pin in the foreoing mannerv
Other objects and advantages of the invention will be
come apparent during the course of the following descrip
tion of the accompanying drawings, wherein:
FIGURE 1 is a diagrammatic view, partly in central
vertical section of the essential parts of a stereotype
plate-casing machine having a molten metal pump
equipped with an automatically-operating spill-out pre
vention bypass valve and circuit according to one form
of the invention;
FIGURE 2 is a fragmentary vertical section along the
line 2—2 in FIGURE 1 showing in left~hand side eleva
tion the driving mechanism of the molten metal pump and
also of the segment gear for opening and closing the
mold halves;
FIGURE 3 is an enlarged fragmentary view of the
shear-pin-connected slidable rim segment gear of FIG
URE 1 with the shear pin intact and the spill-out preven
tion device accordingly held temporarily inoperative;
relatively to the stationary mold component, “back” or
“ring” 44. The mold components 42 and 44 collectively
form the mold set, generally designated 46, with an ap
proximately semi-cylindrical mold cavity 48 between the
mold halves 42 and 4-4 for receiving the stereotype “mat”
or matrix M. Communicating with the mold cavity 43 so
as to deposit molten type metal in the space 48 between
the concave cylindrical surface 50 of the stationary mold
component or back 44 and the convex cylindrical surface
52 of the movable cylinder 42 and thereby' force the
stereotype mat M back against the cylindrical surface 56
of the stationary mold component or cylinder 44. is the
nozzle 54 (FIGURE 1) of a molten metal delivery con
duit or spout 56. The mold components 42 and 44 of
the mold set 46 may be mounted either horizontal or
vertical, different types of machines having both of these
The molten metal delivery conduit 56 leads upward
over the rim of a molten metal cauldron or pot 5S hav
ing a suitable heater 60 operated by electricity or gas, or
other suitable heat source to maintain the type metal T
in the cavity of chamber 62 of the cauldron 58 in a molten
FIGURE 4 is a fragmentary radial section taken along 25 condition. Immersed in the type metal T within the cavity
62 below the level L thereof is the cylinder 64 of a re
the line 4—4 in FIGURE 3, showing the arrangement of
ciprocatory molten metal pump, generally designated
the shear pin and adjacent parts; and
66. The top or end wall 68 of the pump cylinder 64 has
an outlet port 70 to which the molten metal supply con
response to the occurrence of incomplete mold closing, 30 duit 56 is connected. The lower end of the pump cylinder
64 is open and has its lower portion provided with molten
and the toothed rim of a compound segment gear shifted
metal inlet ports 72.
accurately relatively to its web.
FIGURE 5 is a view similar to FIGURE 3, but show
ing the shear pin removed after having been severed in
Stereotype Plate-Casting Machine Construction
Referring to the drawings in detail, FIGURE 1 shows
the mechanical parts, essential to the operation of the
present invention, of a conventional line-casting machine,
generally designated 10.
Such conventional stereotype
plate-casting machines are very complicated, and while
their construction is well-known to those skilled in the
stereotype plate casting art, the illustration and descrip
tion of such parts in detail would serve no useful purpose,
and might actually obscure the mechanical and electrical
parts of the present invention. It is therefore sufficient
for the purposes of the present invention to describe and
illustrate only those parts which participate in the opera
tion of the invention to substantially eliminate molten
Reciprocably mounted in the cylinder bore 74 of the
pump cylinder 64 is a piston 76 bolted or otherwise se
cured to the lower end of a piston rod 78 which passes
through the suitably bored stop and bearing boss 80 and
upstanding top frame 32 of the pump 60 and is guided
thereby in its reciprocation. The upper end of the piston
rod 78 carries a cross pin 84 which is connected to a rock
ing link 86, the upper end of which is pivoted at 88 t0
the yoked forward end 90 of a pump operating arm 92,
the hub of which is keyed or otherwise drivingly con
nected to a shaft 94 to which is keyed an arm 93 slotted
longitudinally to slidably receive a traveling stroke-ad
justment nut 95 moved to and fro by a screw shaft 96
rotated by a hand wheel 97. A link 99 pivotally con
nects the nut 95 to the outer end of a cam follower lever
101 pivoted at 103 to the machine frame and intermedi
metal spill-out.
ate its ends carrying a cam follower roller 105 engaging
For the purposes of the present invention, therefore,
the conventional stereotype plate-casting machine 10 in 50 the cam groove 20 in the worm gear 17 (FIGURE 2).
The top or end wall 63 of the pump cylinder 64- is also
cludes a motor 11 driving through speed-reducing sprock
ets and chain 12, 13, 14 and a worm shaft 15, the worm
16 of which meshes with and drives a worm gear 17
mounted on a shaft 18 (FIGURE 2). The shaft 13 is
rotatably mounted in the frame (not shown) of the m&— '
chine 10. The worm gear 17 on its opposite sides is
provided with a bypass valve port 98 which is closed and
opened from below by a ?oating reciprocatory bypass
valve disc 10%‘ mounted on the lower end of a valve rod or
19 and 20. The cam groove 20 is engaged by a cam
follower roller 21 rotatably mounted on a stud 23 seated
stem 1' 2 and adapted to ?oat in the molten type metal.
Mounted on and bolted to posts or bosses 104 integral
with and rising from the top or end wall 68 of the pump
cylinder 64 is a battle plate 106 bored for the passage
of the bypass valve rod 102 and adapted to de?ect side~
in the web 24 of a compound segment gear 22. The seg
ment gear web 22 carries an arcuately-slidable toothed
wise molten metal spurting up through the bypass valve
port 98.
rim 25 which is temporarily and yieldably held in place
by a breakable shear pin 26, this construction being de
The top frame 82 of the pump 60 is also bored to pro
vide guidance for the bypass valve rod 102 and also
provided with approximately elliptical face cam grooves
carries upstanding bracket structures 108 and 110 re
scribed in more detail below. The compound segment
gear 22 is mounted upon a shaft 23 also rotatably mount 65 spectively spaced laterally apart from one another. The
bracket structure 108 serves to rotatably support the ob
ed in the machine frame.
viously-mentioned shaft 94 whereas the bracket structure
Also meshing with the toothed rim 25 of the segment
110 at its upper end is bored to provide additional guidgear 22 is a segment pinion 30 keyed to ‘a shaft 32 jour
ance for the upper end of the bypass valve rod 102 which
naled in the machine frame. The segment pinion 30 has
integral therewith a radial arm 34 terminating in a yoke 70 is there provided with a stop collar or head 112. The
stop collar 112 is pinned or otherwise secured to the upper
or boss 36 bored to receive a coupling shaft 38, the axis
end of the bypass valve rod 102 to limit the downward,
of which is arranged parallel to the axis of the shaft 32.
Secured to the coupling shaft 38 is a connecting rod 40
stroke thereof and accordingly to limit the width of open-.
ing between the valve disc 100 and bypass port 98.
which is operatively connected by conventional mecha
nism (not shown, but indicated by the dotted line 41) 75 The bypass valve rod 102 near its upper end is pro;
vided with an enlarged collar 114 (Figure 1), the upper
'side of which is engaged by a rotary yoke or cam member
In the operation of the invention, let it be assumed that
116. The latter is pinned or otherwise secured to a cross
the stereotype mat M has been bent from its normallyv
shaft 118 to the outer end of which is keyed or otherwise
flat form into a curved or partially cylindrical form and
secured the hub of a crank arm 120, the outer end of 5
?tted into the mold cavity 43 (FIGURE 1). Let it also
which is yoked to receive a pivot pin 122 (Figure 2).
Pivotally mounted on the pivot pin 122 is the lower end
be assumed that the conventional stereotype plate-casting
machine 10 is operating in its normal manner with the
motor-driven output sprocket 12 rotating the worm 16
of a connecting rod or link 124, the upper portion of
which is pivoted at 126 to the yoked inner end of a handle
. and worm gear 17 with its cam grooves 19 and 20. The
rod 128.
10 cam follower roller 21 in the cam groove 1i! swings the
compound segment gear 22 (FIGURES l and 3) through
Molten Metal Spill-Out Prevention Device
a suitable length of are so as to cause the segment pinion
The molten metal spill-out prevention device, generally
designated 130, is mounted on the stereotype plate casting
machine 10 and includes a solenoid 132 mounted im
mediately above the upper end and stop collar 112 of the
pump bypass valve rod 102. The armature 134 of the
solenoid 132 (Figure 1) is moved downward into engage
ment with the head 112 on the bypass valve rod 102 to
move the bypass valve disc 100 to its open position when
the solenoid winding 136 is energized. The end of the
solenoid winding 136 is connected by a line 138 to a
30, arm 36, connectingrod 49 and connecting mecha-.
nism 41 to move the movable mold component or cylinder
52 into closing engagement with the stationary mold com
ponent 44. Meanwhile the swinging of the cam lever 161
by the engagement of the cam roller 1&5 in the cam
groove 2%) of the rotating worm wheel 17 acts through the
link 9? and arm 93 to swing the pump-operating arm 92
so as to raise the piston rod 78‘ of the molten metal pump
66, the chamber in the upper end of the cylinder bore 74
having been ?lled with molten metal through the ports 72
open type (Figures 1, 3 and ‘5). The bypass control
in the pump cylinder 64 when the pump piston 76 was
below the ports 72.
The lifting of the pump piston 76 by the piston rod '78
automatically causes the bypass valve disc 100 to close
driven output pinion 12 in such a manner as to de
printing plate and permit subsequent reclosing of the
source of electric current, whereas the other end is con
nected thereto by a pair of lines 140 and 142 respectively,
by way of a bypass valve control switch 144 of normally
the port 98 in the cylinder end wall 68, thereby causing
switch 144 is mounted on the web 24 of the compound
molten metal above the piston 76 to pass upward through
segment gear 22 with its operating arm 146 disposed
adiacent the inner edge 14% of the slidable toothed rim 25 30 the port 70 in the cylinder end Wall 68 and thence through
the molten metal delivery conduit 56 downward through
of the segment gear 22. Also mounted on theinner edge
the nozzle 54 thereof into the mold cavity 48 where it
148 is a cam 150 adapted to move into operative engage
forces the matrix M against the concave cylindrical sur
ment with the switch arm 146 upon shearing of the yield
face 50 of the stationary mold component or ring 44 and
able shear pin 26 which prevents motion of the toothed
thus casts an approximately semi-cylindricalprinting plate
rim 26 relatively to the web 24 of the segment gear 22.
‘bearing on its convex surface the type and electrotype pro
Also mounted on the web 24 adjacent the toothed rim
jections formed by the corresponding depressions in the
25 of the segment gear 22 is a motor safety control
matrix M.
switch 154 which has on its upper side a- swinging operat
The machine continues its normal operation to cause
ing arm 156 adapted to be actuated by an L-shaped cam
the descent of the pump piston ‘76 in the cylinder bore
158 bolted or otherwise secured to the end of the toothed
74 and at the same time permit the bypass valve disc
rim 25. Like the cam 1511, the cam 158 is normally
1th‘) to drop in response to pump suction, admitting molten
spaced away from the switch arm 156 when the shear pin
metal into the upper part of the cylinder bore 74 which
26 is intact, but moves into engagement with the switch
is further enhanced by metal ?ow through the ports '72
operating arm 156 when the shear pin 26 is severed, as
vas soon as the piston 76 passes below the ports 72. The
explained below in connection with the operation of the
connecting mechanism 41 meanwhile moves the movable
invention. The motor control switch 154 is conventional
mold component 42 away from the stationary mold com
and is connected by conventional wiring (not shown) into
ponent 44 so as to permit withdrawal of the completed
the control circuit of the driving motor of the motor
energize the motor in response to severence of the shear
pin 26 and consequent arcuate circumferential sliding of
the toothed rim 25 of the segment gear 22 relatively to
the web 24 thereof, as described below in connection with
the operation of the invention.
mold halves 42 and 44 for repeated casting or other
printing plates from the same matrix M, if such is de
sired. During this action, the web 24 and rim 25 of the
segment gear 22 occupy the relative positions shown
in FIGURE 3.
If, however, a chip or other piece or particle of foreign
In order to guide such arcuate sliding, the web 24
(FIGURE 4) is provided with an arcuate rib 160 which 55 matter comes between the mold components 42 and 44,
so as to prevent complete closing thereof, the mold com
slidably ?ts a corresponding arcuate groove 162 in the
ponent 42 halts prematurely, together with the segment
arcuate toothed rim 25, both the rib 164} and groove 162
pinion 34}. This in turn halts the motion of the arcuate
being concentric with the shaft 28. Bolted or otherwise
toothed rim 25 of‘ the segment gear 22. The segment gear
secured to the rearward side of the toothed rim 25 of the
web 24, however, continues to be rotated by the cam
segment gear 22 is an arcuate overhanging retaining plate
slidably receiving the correspondingly arcuate periphery
follower roller 21 on the stud 23 engaging the cam
groove 19, the relative motion between the web 24 and
it for precise shearing at the junction plane between the
tothe now-halted segment gear rim 25 causes the operat
166 which in effect forms an arcuatechannel 164 for
its toothed rim 25 shearing the shear pin 26 at its annular
165 of the web 24 (FIGURE 4). The toothed rim 25
weakening groove 172 (FIGURE 4).
and web 24 are provided with aligned holes 168 and 170
for receiving the shear pin 26, the shank of which is pro 65 As a result of the shearing of the shear pin 26, the
consequent motion of the segment gear web 24 relatively
vided with an annular weakening groove 172 to weaken
ing ?ngers or levers 146 and 156 of the switches 144
rim 25 and web 24. The holes 168 and 170 are so
and-154-to move into operative engagement with their
located as to temporarily lock the toothed rim 25 with 70 respective cams 15d‘ and 153 mounted on the now~halted
its ?xed cams 150 and 158 spaced away from the respece
segment gear rim 25. The consequent closing of the
tive operating arms 156 and 146 of the electric switches
switch 154 causes de-energization of the motor 11 which
154 and 144 during normal operation, as shown in FIG?
drives the output sprocket 12, Worm 16 and worm wheel
URE 3, so as to render these switches inoperative so long
17, but the momentum of the rotating parts continues to
as the shear pin 126 remains intact.
75 swing the pump-operating arm 92 and pump piston 76
upward (FIGURE 1) for a sufficient distance to cause
continued delivery of a substantial quantity of molten
metal from the pump 66 through the delivery spout 56
into the mold cavity 48, spilling out through the crack or
sponse to the energization of said motive device by said
circuit, a circuit-energization control switch in said circuit
connected to one of said relatively-movable parts and
having an operating member extending into proximity
gap created by the chip holding the mold components;
to the other of said parts, and a switch-actuating element
connected to the other relatively-movable part and mov
able in conformity to the motion thereof into actuating
engagement with said switch-operating member in re
42 and 44 from closing were it not otherwise prevented.
Such spill-out of molten metal resulting from the
momentum of the moving parts of the machine 10 is,
sponse to fracture of said coupling element upon prema
however, effectively prevented by the substantially instant
operation of the present invention. The shearing of the:
ture halting of said driven part by incomplete closing of
said mold components in cooperation with continued rela
tive motion of said driving part relatively to said driven
2. A spill-out prevention attachment, according to
claim 1, wherein the relatively-movable driving and driven
parts comprise relatively rotatable pieces and wherein
shear pin 26 in the manner described above and the con-
sequent shifting of the web 24 of the segment gear 22‘
relatively to its toothed rim 25 also moves the operating
lever or arm 146 of the switch 144- into operating engage_
ment with the cam 150 on the now-halted toothed rim.
25, closing the switch 144. This action closes the circuit
between the lines 138 and 14-2 (FIGURE 1), energizing
the solenoid 132.. The energization of the solenoid 132
said switch is mounted on one of said pieces and said
switch-actuating element is mounted on the other of said
causes its armature 134 to move downward into engage
3. A spill-out prevention attachment, according to
ment with the head 1.12 and move the bypass valve rod‘
102 and its valve disc 1% downward away from the
claim 2, wherein one of said pieces comprises the central
portion of a rotary wheel and wherein the other of said
bypass valve port 98.
As a result of this enforced opening of the bypass port
pieces comprises the rim of said wheel, said rim being
arcuately-slidably mounted on said central portion.
4. A spill-out prevention attachment, according to
claim 2, wherein one of said pieces comprises the hub
98, any molten metal above the piston 76 of the pump
66 being moved upward as a result of the momentum
of the moving parts escapes directly into the chamber
62 of the molten metal cauldron 58 instead of passing
and-web portion of a gear and wherein the other of said
upward through the port 7% and discharge spout 56 down.v
pieces comprises the toothed rim of said gear, said rim
being arcuately slidably mounted on said hub-and-web
ward to the mold cavity 48. As a consequence, the ?ow
of molten metal is halted almost instantaneously, with:
the spill-out through the crack between the mold com
ponents 42 and 44 of a negligible amount of molten metal
which would otherwise occur by the overrunning of the
moving parts of the machine due to momentum, even
5. A spill-out prevention attachment, according to
claim 4, wherein said switch is mounted on said hub-and
web portion of said gear and wherein said switch-actuat
ing element comprises a cam mounted on said rim portion
of said gear.
after de-energization of the motor which drives the output
pinion 12.
6. A spill-out prevention attachment, according to
claim 1, wherein the pump bypass valve has a reciproca
ble valve-operating member and wherein said motive de
vice has a reciprocable motive member engageable with
As soon as the source of the difliculty preventing proper
closing of the mold components 42 and 44 has been lo
cated and removed, the toothed rim 25 and web 24 are
said reciprocable valve-operating member.
7. A spill-out prevention attachment, according to
again brought back into proper alignment of the holes:
168 and 170, whereupon a new shear pin 26 is inserted
and the machine is ready for further operation. As a
claim 6, wherein said motive device comprises a solenoid
with an actuating winding connected to said energization
circuit and wherein said motive member comprises an
armature engageable with said valve-operating member.
result of the spill-out prevention device of the present
invention, therefore, the tedious chipping out and removal
of the spilled over and solidi?ed molten metal from the
8. A spill-out prevention attachment, according to
claim 6, wherein the relatively movable driving and driven
parts comprise the relatively movable central and rim
portions of a wheel, said rim portion being arcuately
adjacent parts of the plate-casting machine 10 is effective
ly eliminated, with a consequent elimination of the ex
pensive labor costs and time of idleness of the machine 10.
What I claim is:
slidably mounted on said central portion.
1. A metal spill-out-preventing pump-and-mold appara
tively connected to at least one of said mold compo
9. A spill~out prevention attachment, according to
claim 7, wherein the relatively movable driving and driven
parts comprise the relatively movable central and rim
portions of a wheel, said rim portion being arcuately slid
ably mounted on said central portion.
10. A spill-out prevention attachment, according to
nents for selectively opening and closing said mold
components, a fracturable coupling element normally inter
portion of said wheel and wherein said switch-actuating
tus for installation in a conventional stereotype plate
casting machine, said apparatus comprising a plate-casting
mold including separable mold components de?ning a
mold cavity therebetween, power-driven mechanism in
cluding relatively-movable driving and driven parts opera
connecting said relatively-movable driving and driven parts
in relative-motion-restraining relationship and adapted to
claim 8, wherein said switch is mounted on said central
element comprises a cam mounted on said rim portion of
60 said wheel.
be fractured in response to incomplete closing of said mold
components, a molten metal supply pump connected to
said mold cavity for supplying molten type metal thereto
and including a molten metal bypass valve, an electrical
energization circuit adapted to be connected to a source 6
of electricity, an electromagnetic valve-operating motive
device connected to said circuit in energized relationship
therewith and having a motive member operativcly con
nected to said bypass valve to engage and shift said by
pass valve into its pump ?ow bypassing position in re 70
References Cited in the ?le of this patent
Tornberg et al. ________ __ Dec. 2, 1952
Holmes et al. ________ __ Sept. 18, 1956
Germany _____________ __ June 3, 1952
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