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Патент USA US2118764

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May 24, 1938.
H, E. MCWANE
2,118,764
MOLD CONSTRUCTION
Filed OC'lZ. l5, 1934
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Patented May 24, 1938
2,118,745@
U N IT ED S TA'lÍEïSï-l
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2,118,764-A
MOLD CONSTRUCTION »«
Henry
McWane, Lynchburg, Va.
Application »October 13, 1934, Serial I*Io.~.748,229.A
3 Claims..
This: invention- relates to casting; and `more
particularly. has reference .to a mold and a ~.core
for Vuse in connection therewith.
Considerable `diilìculty. vhas beenexperienced in ‘
- thef'cpast. when itÁ hasV been necessary to'usesa
core in. casting objects in ~metal or other mate--
rials.. During shrinkage ofthe casting upon cool*
in elevation "of a coresimilar to the core -of Fig-`
ure'-=2,'savefonly1that it isv cylindrical instead‘of
frusto-conical.
Figure ‘7 isa view partly in `>section and partly*
5 .
ingr` there is of course a .tendency to displace the.
cores If; this tendency is. resisted by a ñxation of
thecore, appreciable `stresses and strains are set
up. in `the. casting, frequently resulting. in f the
splitting or crackingthereof; In. order to over
come. thisit has .been proposedto employ cores
in elevation kof a somewhat modified type 'of core '
that arecapable of moving upon shrinkage of the
applied to `a mold for casting plates 4in whichiit`
is desired to provide apertures, but'it`wil1'iof 15’
course -be appreciated that it is of `wider applica
tion,.and may be used'in connection with'cast.
= casting.
Certain disadvantages have .inhered in .such
priorY cores,- however, inasmuch as they have
usually been of the destructible type suchas sand
cores, for instance, and furthermore it has here‘
tofore been necessary to manually arrange the
20
core- in the mold cavity prior to each pouring
operation..
Oneof the objects of my inventionis tov over-Y
come the above mentioned difliculties.
Another object of my inventionis 'to provide» a
permanentY core which is free to moveuponv
shrinkage of the castingand whichis automati-.
cally repcsitioned- for a pouring operation upon
removal of the casting fromthe mold cavity.
soy
Figure 5 `is a sectionallview alongthe line `5-'-5‘
of Figure‘2, vlooking in the direction of the arrows.r
Figure 6 is a view partly insection‘and-partly.î
With’these and otheri objects in view which:
and associated mechanism.
Figure 8 is a sectional View along .the line 8_3’
of Figure' 7; looking in the direction of the ar-'
rows.
In the drawing, I have shown my Yinvention as.
ings'of various types.
In Figure 1 I have'shown‘the lower half „of :at
mold 1| `provided with the usual mold'cavitiesû 1
and gates 3. The cores forming the subject mat'
terr of- my invention I have designated generallyv
by the numeral 4." The metal in the cavities> 2
isadapted to flow about the cores 4 to thereby
formxbolt:` holes or other apertures in'the iin-.`
ished casting.. I‘f guide grooves are. desired*>
inthe apertures -oi the casting, a Vrib 5 'may be
formed `upon the core.
The‘core «may be `of frusto-conical shapepas-l
indicated >atti in’Figure 2, orv may be cylindrical, î ,
may be incident to my improvements, the inven
tion consists in the parts andvcombinationsto be
hereinafter set forth and claimed, with thek un
various other shapes may be employed.
derstanding that the several necessary velements
mounted on a stemt which extends'finto‘ achan-`
comprising my Áinventionmay loe-varied incon
nel 5l drilled in the mold and runs from the base
as vshown at l in Figure 6.
Of course, cores of.'
As shown inr‘Figures 2 .rand 6, the core \- isv
struction, :proportions and arrangement without
thereof to thev mold cavity.
As best shown in Figures 4 and 5, I prefer thatf
the stem 8 Yand the-channel 9 be 'triangular 'in
pended claims.
In order to make my .invention more clearly` cross section, andthat Vthey becorresponding
«understood,.I have shown in the accompanying triangles.` The position’of thev core in the mold
drawing means for carrying the same into prac
cavity is such thatfthe stem 8 fits tightly withinJ
tical eii'ect without limiting theimprovementsin the apex of the channel, as shownlin Figure '4.i
their fuseful'applications to the particular conh` This serves to .seat‘the core and to insure a seat-x
structionswhich; for the purpose’of explanation, ing ofthe core atfone place for all pouring-'oper
ations.
have been made the subject of illustration.l
departing from the spirit» and scope of the ap
In fthe. drawing:
Figure: l isa top plan rview of a mold section
equipped with my invention.
-
Figure 2 is a sectional .view along the line. 2-.-2
.t of Figure. I_,showing one type of core that may i
beemployed.
of mounting the stem therein.
v
In Figures 2 through'ö I have shown a pivotal.J
arrangement.A In these figures thelower portion"v
of the channel 9 from the dotted :line fl I" ter-'
Figure 3 is a top plan viewof the core shown4
in Figurev 2.
The fstem‘ may be secured in the channel 9 ¿in'
variousways; and I have merely showntwo waysv
.
Figure 4 is a sectional view along the line 4-4
55 of Figure 2, looking in the direction of the arrows.
minates in a square channel l2. In .this channel ~>
I have provided a pivot bar I3 suitably supported..
by. arms.A i4» A horizo-ntalslot l5 is cutLintoxthe
apex of the stem 8 adjacent its lower end, and
2
2,118,764
is adapted to receive the pivot bar I3. It will
therefore be appreciated that the stem 8 and the
core 4 are adapted to swing about the bar I3 as
a pivot. The arc described by the core 4 is very
slight and only an inappreciable clearance be
tween the core and mold cavity need be main
tained. This clearance is not suiiicient to permit
of the leakage of any of the molten metal that is
poured into the cavity.
10
To facilitate the assembly of the core in the
mold, I prefer to drill a recess IB in the base of
the mold and adjacent and communicating with
is believed to be apparent. In the case of the
form shown in Figure 2, the shaft 8 is extended
into channel 9, and the slot I5 fitted over the
pivot bar I3. The spring 22 is then arranged be
tween the stem 8 and the end Wall of channel 2I.
In the case of the device shown in Figures 7
and 8, the stem is inserted in channel 9 from the
mold cavity, and the block 24 is then screwed
thereon, after first arranging spring 29 in its
channel 28. 'I'he block 26 is then screwed into 10
position.
It will be noted that during a casting operation
the channels 9 and I2. This recess may be pro
the core 4 is adapted to freely move with respect
vided with shoulders I1, if desired. A block I8 is to the core body and in the direction of shrinkage
15 adapted to be inserted in the recess to form the v of the casting. As is well known, a casting shrinks
base and one wall of the channel I2. Screws I9, so that its edges recede from the walls of the
or other suitable fastening means, may be em
mold cavity, and the channels 9 are so formed as
ployed to secure the block in position.
to take care of this direction of movement by the
It will be noted that the block I 8 ñlls the recess
core 4. With respect to the device of Figure 2,
20 I6, but in the top wall of the recess there is
while it is true that the core theoretically de 20
formed a channel 2I which communicates with scribes an arc, in actual practice this arc is so
channel 9. In the channel 2l there is positioned slight that for all intents and purposes the move
a coil spring 22 which is adapted to have one end ment is in a single plane. As pointed out above,
bear against an end wall of the channel 2| and its a slight clearance suffices to take care of the
opposite end bear against the base of the triangle throw of the arc, a clearance which is not suf 25
of stem 8. This spring serves to maintain the ñcient to permit a leakage of the molten metal.
apex of stem 8 against the apex of channel 9, but
When the casting is removed from the mold
of course resiliently permitting movement of the cavity, the springs 22 and 29 urge the stem 8 and
stem 8 from this position. As stated above, I core 4 to their seated position for the next pour
30 prefer that the stem 8 and channel 9 be triangu
ing operation. The triangular shape of the stem 30
lar in cross section, in order to guide the stem and block 24 determines the uniform seated posi
to its seat for a pouring operation. It will of tion for all pouring operations.
course be appreciated, however, that under some
The advantages of my invention are believed to
circumstances the shape of the stem and channel be obvious. It permits of the free contraction or
may be varied.
shrinkage of a casting upon cooling, thus pre 35
As stated above, the movement of the core in venting the imposition of objectionable stresses
Figure 2 is, to all intents and purposes, horizontal. and strains in the casting. Also, upon removal
However, in Figures '7 and 8, I have shown a of the casting, the core is automatically returned
modiñed arrangement in which the core and its from its displaced position to its true seat, a seat
40 associated elements truly slide horizontally rather
which is uniform for every casting. It is also 40
than being pivoted. In this form the stern 8 and obvious that my invention is inexpensive to manu
channel 9 may be triangular, as in the case of the
facture and effects an appreciable economy over
previously described core structure, or may be of
those prior structures in which the core has been
a different shape, as above mentioned. Secured
manually seated in the mold cavity.
to the base of the stem 8, preferably by means
While I have shown and described the preferred 45
of a screw 23, is a block 24. The block 24 is
embodiment of my invention, I wish it to be
preferably triangular, and is adapted to slide understood that I do not confine myself to the
within a correspondingly triangular recess 25. precise details of construction herein set forth, by
The recess 25 is drilled from the base of the mold way of illustration, as it is apparent that many
and is adapted to be filled by a plug 26. The plug changes and variations may be made therein, by 50
26 is maintained in position by means of screws those skilled in theart, without departing from
21 or other appropriate fastening means, It will
the spirit of the invention, or exceeding the scope
of course be appreciated that that part of the of the appended claims.
recess 25 filled by the plug 26 need not be triangu
I claim:
55 lar, and furthermore, the block 24 need not be
l. In a casting apparatus, a mold having a 55
triangular. I prefer, however, that the plug 24 cavity, a permanent core located in the cavity,
and recess 25 should be triangular in order that said core being provided with a stem pivoted to
the block and core might be guided to a uniform the mold, and means for resiliently maintaining
seat for the pouring operation.
the core at a predetermined position in the cavity.
60
Communicating with the recess 25 is a channel
2. In a casting apparatus, a mold having a 60
28 adapted to hold a coil spring 29. One end of cavity, a core mounted upon a stem, the said stem
the coil spring bears against the base of channel lying within a channel extending from the mold
28 and the other end against the base of the cavity and pivoted therein, and means for re
triangular block 24. It will therefore be appreci
siliently maintaining the stern in a predetermined
65 ated that the spring 29 tends to urge the block 24
position.
65
into the apex of the triangle of recess 25 and to
3. In a casting apparatus, a mold having a
maintain it in that position. At the same time, cavity, a triangular shaped channel extending
however, it permits of retraction of the block 24 from the cavity, a core adapted to close the cavity
from that position. It will also be noted that the end of said channel, a stem of triangular shape
70 base of the core S lies flush upon the base of the
secured to the core and pivoted within the chan 70
mold cavity, and that the block 24 ñts snugly be
nel, and resilient means to urge the stem into one
tween the upper part of recess 25 and the top of apex ofthe channel.
block 26.
HENRY E. MCWANE.
From the foregoing, the operation of my device
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