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Патент USA US2262338

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NOV- 11, 1941-
Filed July 16, 1941‘
2 Sheéts-Sheet l
' I9
mug/mend} Scym?‘é
(99 Q5»,
Nov. 11, 1941.
Filed July 16, 1941
v2 Sheets-Sheet 2
( 37
2k Sag/1,1217%
11, 1941
' 2,262,338;
Raymond J. Schultz, Madison, Wis., assignor to
‘Madison-Kipp Corporation, Madison, Wls., a
corporation of Wisconsin
Application July 16, 1941, Serial No. 402,656
5 Claims. (Cl. 22-70)
This invention relates to die casting machines
and particularly to machines of the type in which
a ported pressure‘ chamber ‘is submerged in the
melting pot in a substantially ?xed position, the
molten metal entering the'chamber through the
ports and being displaced therefrom into the die
et l4. The nipple plate has a socket which re- ‘
ceives the nipple on the pressure chamber and
connects it with the sprue in’the die, so that
by a plunger which closes the ports at the start .
metal displaced from the pressure chamber is dl- -
ing any direct relation to the present invention
are the die components, generally indicated at 12
and the ?oating nipple plate l3 carried by brack
of its displacement stroke.
rected into the die.
In past constructions, the nozzle or discharge
The housing I5 encloses the burner mechanism ‘l
end of ‘the pressure chamber has been ?xed and 10 and carries at its upperend the furnace cham
ber or muli‘le 16 in which the melting pot is re- ‘
the other end, at opposite sides of the plunger
ceived. The top of chamber Hi is closed'except
chamber, has been supported by laterally ex
for a main aperture of ovoid con?guration, which
tending wings which "rest on the margins ‘of the
is ?lled by the melting pot I1, and except for the
melting'pot and are ‘capable ‘of limited sliding
two o?takes If’, H which include tubular exten
motion horizontally, but cannot move vertically.
sions, as shown
The melting pot conforms in plan to the con
This construction results in‘occasional fracture
of the pressure chamber‘occurring either when
the machine isshut down and as the metal in
the pot-solidi?es, orlwhen solidi?ed metal in the
tour of the opening in the top of chamber l6, so
‘as to ?ll the same.
The form of the pot, as
pot is being heatedup to melting temperature 20 viewed in elevation is indicated in dotted lines
tion just described, in such a manner that the
in Figs. 1 and 3. Thus the pot depends into the
furnace chamber I6 from a supporting marginal
?ange 2 I. This surrounds the pot, except at the
wing supports permit limited‘ yielding both up
end adjacent pedestal l I, and rests on a seat sur
preparatory to putting the machine into action.
The present invention modi?es the construc
and down against spring resistance of such char
rounlding the pot-opening in the top of cham
acter and range as to relieve the destructive
ber B.
Resting on ?ange 2| is the base ?ange 22 01a ‘
domed cover casting 23 which overlies somewhat
more ‘than half of pot IT. This has lugs 24 to
stresses caused by thermal ‘expansion and con
traction, without impairing the alinement of the
plunger, or its functional movements. Horizon
tal stresses are relieved‘ by motion at the nozzle 30 support any ‘suitable mechanism (not shown)
used to operate the plunger. This mechanism
may be hand or power operated and is not direct
The design of the spring support is such as to
ly involved in the present invention.
give the desired high spring resistance and still
The portions 25 of ?ange 22 (see Figs. 1 and
withstand the high operating temperatures.‘ '
3) are each thickened and provided with an up
A practical adaptation of the invention to a
commercial die casting machine is illustrated in
the accompanying drawingaln which:
Fig.- 1 is a side elevation'of so much of‘ a die
casting machine as is necessary to illustrate the
Fig- 2 is a plan view‘ of the parts
standing boss 26,_ beneath which the lower face
is provided with a rectangular notch 21. The
notches 21 are‘ above opposite margins of pot’l‘l
and are alined with each other, and approxi
mately aliried with the plunger chamber 28 ‘of
metal forcing unit 29.
The metal forcing unit 29 comprises a hollow
casting havingan inclined neck 30 with stiffen
Fig. 3 is an end elevation, looking to the left
relatively to Fig. 1.
ing‘ web 3|, the neck extending (as viewed in Fig.
- Fig. 4 is a view partly in vertical section‘ and 45 1) upward and to the left from the bottom of the
upright plunger chamber 28 and terminating in
partly in elevation showing how the nozzle end
of the pressure chamber is supported and con
a nipple 32 which coacts with plate l3.. The
plunger chamber is bushed, as indicated at 33,
and a discharge‘passage leads from the bottom
Fig. 5 is an elevation of the parts shown in Fig.
4, looking to the right relatively to that ?gure.
of this chamber through the inclined neck 30 to
the port in nipple 32.
Fig. 6 is a view partly in elevation and partly in
Wing brackets 34 extend from opposite sides of
section showing the yielding mounting for one of
the unit 29. They are alined and approximately
the two wings.
centered on chamber 28, and terminate in pads
The pedestal ll supports the die mechanism
part of which is illustrated. The only parts hav 65 35 which enter and are free in the notches 21.
Fig. 1.
, .
The brackets 34 are each stiffened by top webs
What is claimed is:
35 and by two spaced ?aring bottom webs'3l' '
l. The combination of a plunger; a pressure
unit adapted to be submerged in molten metal
which shroud the inlet ports 38 (see Fig. 6)
through which molten metal enters the plunger
and comprising a transverse pressure chamber
chamber. The level of molten metal in pot I1 is 5 adapted to receive said plunger and a longitudi
kept near the top of the pot so that the ports
nal nipple in communication with and remote
38 are submerged.
The bottom of plunger 39 rises on its up-stroke
from said chamber; and a‘ three point support for
said unit, comprising means embracing said nip
ple: and permitting longitudinal motion thereof
far enough to clear ports 38, and on its down
stroke ?rst closes the ports and then displaces 10 as an incident to thermal expansion and con
metal from the chamber 28 through the nipple 32
traction, two guides adjacent, and parallel with
as is usual in machines of this type.
the axis of, said chamber and engaged by por
As stated the pads 35 are free in notches 21,
tions of said unit, and yielding means serving to
but the range of motion is not sufficient to impair
center said units in said guides, the yielding
the alinement of the plunger. shouldered studs 15 means being of sufficient strength to resist the
II are threaded into the tops of pads 35 and
reaction of the plunger, and capable of yielding
are closely guided in vertical ways drilled through
to relieve shrinkage strains.
the bosses 26. Fixed to the upper end of‘ studs
2. The combination de?ned in claim 1 in
ll are heavy spring elements 42 whose form is
which the yielding means comprise heavy arcu
clearly shown in the drawings, see particularly 20 ate spring loops, and the guides include limit
Figs. 3 and 6.
stops which so limit motion of the unit as to
These spring elements comprise a central hub
prevent substantial misalinement of the plunger
43 in which the upper end of stud M is fixed
and pressure chamber.
by a nut and fro looped spring ends which seat
3. In a die casting machine, the combination
on portions 25 ‘if ?ange 22 and are ?xedly held
of a melting pot; a metal forcing unit at least
thereto by nuts on the studs 44. The studs 44
partially submerged in molten metal in said pot,
pass through the ends of the springs 42, the
said unit having at one end a vertical plunger
thickened portionv 25 of ?ange 22 and through
chamber and at the other end a horizontally ex
?ange 2!. They are threaded into the top of
tending nipple communicating with said cham
housing l6. Machine screws 65 further connect 30 ber; clamping means embracing said nipple and
?anges 22 and 2! to the top of chamber Hi.
adapted to permit limited horizontal motion; ver
In this way a rigid support is provided for the
tical guides for said unit adjacent said chamber
plunger actuating mechanism, but the chambered
and on opposite sides thereof; and yielding means
end of the metal forcing unit 29 is permitted very
associated with said guides and adequate to sus
limited vertical motion up and down from its 35 tain said unit against the stresses occasioned by
normal reutral position against heavy resistance
normal operation of the machine, but serving to
offered by the springs 42. Additional ffictional
relieve shrinkage strains.
resistance may be imposed by setting up the
4. In a die casting machine, the combination
thrust screws 46. These are provided with check
of a melting pot; a metal forcing unit at least
nuts to preserve their adjustment.
40 partially submerged in molten metal in said pot,
The neck portion of the unit 29 is sustained
said unit having at one end a vertical plunger
immediately behind nozzle 32 in an ori?ce formed
chamber and at the other end a horizontally ex
partly in the pot i‘! and partly in the dome 23
tending nipple communicating with said cham
(see Figs. 4 and 5). The nozzle has an arcuate
ber; clamping means embracing said nipple and
boss or rib 41 which seals with the pot H. A set
adapted to permit limited horizontal motion; ver
screw 48 threaded in a boss formed in the dome
23 exerts the desired sealing pressure. The screw
48 is locked by a check nut.
tical guides for said unit adjacent said chamber.‘
and on opposite sides thereof; yielding means
associated with said guides and adequate to sus
The construction is such that the plunger and
tain said unit against the stresses occasioned by
plunger chamber are held in alinement, but lim 50 normal operation of the machine, but serving to
ited vertical motion of the chamber is permitted
relieve shrinkage strains; and limit stops associ
adjacent the plunger. However. the springs are
ated with said guides.
so stiff that they do not yield appreciably to the
5. In a die casting machine, the combination
stresses imposed by the plunger. Horizontal
of a melting pot; a metal forcing unit at least
creep is permitted adjacent the nipple. Thus 55 partially submerged in molten metal in said pot,
shrink strains are relieved and fracture of the
said unit having at one end a transverse plunger
unit thereby is avoided, during both heating and
chamber and at the other a nipple communicat
cooling of the melting pot,
ing with said chamber and extending substan
While some details of the die casting machine
tially at right angles to the axis thereof; sup
have been described to indicate the environment 60 porting means adjacent said chamber for guid
in which the invention develops its utility, the
ing said unit in limited motion in a direction
form of the machine is obviously subject to Wide
parallel with the axis of said chamber; yielding
variation. The details of mounting the pressure
sustaining means associated with said guiding
unit in any appropriate die casting machine are
means; and means for clamping said nipple
the real subject of invention and they too are
while permitting limited motion in the direction
subject to modi?cation within the scope of
of the axis thereof.
the claims which alone define the scope of the
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