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Патент USA US3028653

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April 10, 1962
R. E. WEDLAKE
3,028,643
CORE UNIT WITH COLLAPSIBLE PIN FOR SAND MOLD
Filed NOV. 15, 1960
2 Sheets-Sheet 1
1U.
INVENTOR.
.20)’ E. WEDLAKE.
$- 7024/5 rs,
April 10, 1962
R. E. WEDLAKE
3,028,643
CORE UNIT WITH COLLAPSIBLE PIN FOR SAND MOLD
Filed Nov. 15, 1960
2 Sheets-Sheet 2
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United States Patent
” ICC
3,028,643
Patented Apr. 10, 1962
1
2
3,028,643
a transverse passage 10, in which a horizontal rod 11
(FIG. 5) may be inserted for connection to a crane
or the like to permit the core unit to be lowered into
CORE UNIT WITH COLLAPSIBLE PIN
FOR SAND MOLD
Roy E. Wedlake, 20 Lincoln Ave., Wheatland, Pa., as
signor of one-half to Martin E. Cusick, Sharpsville, Pa.
Filed Nov. 15, 1960, Ser. No. 69,448
4 Claims. (Cl. 22-165)
This invention relates to metal molding apparatus, and
?ask 1.
'
V.
The core pin also is provided with a transverse pas‘
sage 12 which, when the pin is in its upper position
._ as shown in FIGS. 1, 5 and 6 is exposed at the top
of the core. A dowel 13 extends through this passage
and its projecting ends rest on the core bar to hold the
more particularly to a core unit used in a sand mold 10 pin up.
for hollow castings.
In my Patent 2,565,829, apparatus is shown for cast
ing ingot molds. The core unit 10 includes a core pin
12 by which the core unit can vbe carried. In an at
The upper end of the core is provided with
a shallow vertical socket 14 for receiving the lower end
of a metal collar 15 that extends upward around the
pin to a point directly below its upper passage 10. The
collar is spaced from the pin. To prevent the dowel
tempt to prevent damage to the pin during extraction 15 from interfering with seating of the collar in the socket,
of the casting, the pin was made removable. However,
the side wall of the socket is provided with a pair of dia
the idea did not work out in practice as well as was
metrically opposite notches 16 that receive the opposite
expected.
'
ends of the dowel. Also, the bottom of the socket is
It is among the objects of this invention to provide a
provided with notches 17 in line with notches 16 so that
core unit, in which during the casting operation the core 20 the dowel will not project above the lower surface of
pin will automatically move into a position where it
the socket.
'
> will not be damaged during extraction, in which the
After ‘this core unit has been placed in position in a
molten metal that is poured into the mold causes the
?ask and molding sand has been packed around it, molten
pin to move into a safe position, and in which the pin
metal 18 is poured into the ?ask around the core as
cannot become separated from the core.
shown in FIG. 6. The poured metal causes the dowel
In accordance with this invention a hollow upright
to disappear because it is consumed by the heat. Al
core, sometimes called a core bar, has a central vertical
through the dowel can be made of low melting point
opening through its upper end. Slidably mounted in
metal, it is preferred to make it of combustible material,
this opening is a pin that has an enlarged lower end
such as wood. As soon as the dowel has melted or
30
inside the core for supporting the core when the pin is
burned away, the core pin will drop down into the
lifted. The pin is provided with a transverse passage
core as shown in FIG. 4. To prevent the pin from
for receiving a dowel supported at its ends by the core
falling to the bottom of the core, means is provided for
bar when the pin is in elevated position. The dowel
stopping it with its upper passage 10 accessible through
is consumable by the heat of molten metal poured around
notches 16 so that a lifting rod can be inserted later.
the core unit, whereupon the pin will drop down into 35 The pin arresting and supporting means may be merely a
the core. The inside of the core is provided with means
rod 19 extending across the inside of the core and
for limiting the descent of the pin so that it can be raised
mounted in its side walls.
later for carrying the core.
After the poured metal has cooled su?'lciently, collar
The preferred embodiment of the invention is illus 40 15 is removed from the top of the core as shown in
trated in the accompanying drawings, in which
FIG. 4 and then suitable extracting apparatus is pressed
FIG. 1 is a side view, partly in vertical section, of my
down on the core while simultaneously pulling upward
core unit inside a ?ask;
FIG. 2 is an enlarged horizontal section taken on the
on the flask to strip the ?ask from the casting, as shown
in FIG. 7. The extracting apparatus includes an ex
line II—II of FIG. 1;
,
tractor pin 21 that has a recessed lower end which ?ts
FIG. 3 is an enlarged fragmentary perspective view ‘of 45 over the upper end of the core pin and presses down
the upper end of the core without the core pin;
on the bottom of core socket 14. Due to the short
FIG. 4 is a view similar to FIG. 1, showing extract
projecting portion of the lowered core pin, there is no
ing apparatus in place;
FIG. 5 is a side view of the core unit suspended from 50
a crane or the like;
FIG. 6 is a fragmentary vertical section of the ?ask
showing metal being poured into it; and
danger of bending or otherwise damaging it during the
extracting operation.
_
‘
After the core unit has been freed from the casting,
the core pin 8 is raised in core 6 and a new dowel 13
is inserted in passage 12 to support the pin. The side
FIG. 7 is a fragmentary vertical section similar to
of the pin is provided with a vertical spline 25 that
FIG. 4, but showing the ?ask being stripped from the 55 slides in a slot 26 in the side of core opening 7 to pre
casting.
vent the pin from rotating in the core and swinging
Referring to the drawings, an open bottom ?ask 1
passages 10 and 12 out of alignment with notches 16
rests on a base plate 2 and contains a core unit 3 that
when a dowel is not in place. It will be seen that at
is spaced from the inner surface of the ?ask. That sur
no time can the pin become separated from the core.
face and the outside of the core unit are covered with 60 The descent of the pin into the core" during casting is
molding sand 4. The particular apparatus illustrated is
for casting ingot molds, but the principle of this inven
tion also is applicable to molding apparatus for other
hollow castings.
entirely automatic.
'
According to the provisions of the patent statutes, I
have explained the principle of my invention and have
illustrated and described what I now consider to repre
The core unit includes an upwardly tapered hollow 65 sent its best embodiment. However, I desire to have it
metal core 6 that extends nearly to the top of the ?ask.
understood that, within the scope of the appended claims,
The upper end wall of the core is provided with a cen
the invention may be practiced otherwise than as speci?
tral vertical opening 7, in which a core pin 8 is slid
cally illustrated and described.
ably mounted. The pin has an enlarged lower end or
I claim:
head 9 inside of the core for engagement with the upper 70
1. A core unit for a sand mold, comprising a hollow
wall so that the core can be lifted by the pin and car
ried about. The upper end of the pin is provided with
upright core having a central vertical opening through
its upper end, a carrying pin slidably mounted in said
8,028,643
3
opening and having an enlarged lower end inside the
core for supporting the core when the pin is lifted, the
pin being provided with a transverse passage for re
ceiving a supporting dowel ‘having projecting ends sup
ported by the core when the pin ‘is in elevated posi
tion, said ends ‘of the dowel being consumable by the
heat of molten metal poured around the core unit, and
means inside the core limiting the distance the pin can
drop down into ‘it when the dowel‘ends'are consumed.
.4
upright core having a vertical opening through its upper
end encircled by a downwardly extending socket adapted
to support a collar, 21 carrying pin slidably mounted in
said opening and having an enlarged lower end inside
the core for supporting the core when the pin is lifted,
the pin being provided with a transverse passage for re
ceiving a supporting dowl when the pin is in elevated
position, the side wall and base of said socket having
vertical‘notches for receiving the projecting ends of the
'2. A core unit as recited in claim 1, in'which said 10 dowel to support it, said ends of the dowel being con
dowel is combustible.
3. A core unit for a sand mold, comprising'a hollow V
sumable by the heat of molten metal poured around the
core unit, means inside the core limiting the distance
the pin can drop down into-it when the dowel ends are
upright core having a central vertical opening through
consumed, and means holding the'pin against rotation in
its upper end, ‘a carrying pin slidably mounted in said
opening and having an enlarged lower end inside the 15 the core.
core for supporting the core when the pin is lifted, the
References Cited in the file of this patent
pin being provided with a transverse passage for receiv
UNITED STATES PATENTS
ing a supporting dowel when the pin is in elevated po
sition, the upper end of the core having vertical notches
493,047
Simpson _____________ __ Mar. 7, 1893
for receiving the projecting ends of the dowel to sup 20
665,865
Baker _______________ __ Jan. 15, 1901
port it, said ends of the dowel being consumable by the
922,678
Dimmick ____________ __ May 28, 1909
heat of molten metal poured around the core unit, and
1,664,452
Daniels et al. _________ __ Apr, 3, 1928
means inside the core limiting the distance the pin can
drop down into it when the dowel ends are consumed.
4. A core unit for a sand mold, comprising a hollow 25
1,852,502
Brown _______ -4 ______ .._ Apr. 5, 1932
2,565,829
Wedlake _____________ __ Aug. 28, 1951
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