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Патент USA US2120833

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June 14, 1938.
R. E. DAY
'
2,120,833
PISTON MOLD
,
Filed Ndv. 13, 1935
m. 4wlu.‘I
_
INVENTOR
2,120,833
Patented June 14, 1938
UNITED STATES PATENT OFFICE
2,120,833
PISTON MOLD‘
Ray E‘. Day, Grosse Pointe Farms, Mich.
Application November 13, 1935, Serial No. 49,495
6 Claims. (01. 22-151)
This invention relates to molds for casting pis
tons for internal combustion engines, such for ex
ample as aluminum alloy pistons, the invention
being applicable in connection with split molds
5 wherein either a sand core or a sectional steel
core is utilized.
The present application is a continuation in
part of my co-pending applications Serial Nos.
692,751 and 692,753 both ?led on October 9,1933.
10
An object of the invention is to provide a mold
for casting a piston having a head, piston pin
bosses and oppositely spaced skirt or bearing
faces, and wherein improved means is provided
for casting into the piston struts or webs which
‘ 3 extend angularly and converge from the bosses to
the skirt.
Another object of the invention is to provide
a mold for casting a piston of the foregoing type
in which the improved construction is such that
‘30 the strut forming mold portions are separate
from the core, thus providing a mold of relatively
simpli?ed construction adapted to permit more
economical casting operations, and effect other
desirable and bene?cial results.
25
Another object is to provide improved means
for clamping the mold sections together and for
“breaking” the sections apart after the casting
operation.
Other objects of my invention will appear from
30 the following description and appended claims
when considered in connection with the accom
panying drawing forming a part of this speci?
cation.
In said drawing:
Fig. 1 is a horizontal section, partly in plan,
of one form of mold made in accordance with my
invention.
Fig. 2 is a vertical section taken substantially
along the line 2—-2 of Fig. 1.
40
Before explaining in detail the present inven
tion it is to be understood that the invention is
not limited in its application to the details of
construction and arrangement of parts illustrated
in the accompanying drawing, since the inven
45 tion is capable of other embodiments and of being
practiced or carried out in various ways. Also
it is to be understood that the phraseology or ter
minology employed herein is for the purpose of
description and not of limitation, and it is not
50 intended to limit the invention claimed herein
35
beyond the requirements of the prior art.
Referring particularly to Figs. 1 and 2 of the
drawing, the split mold is shown as a whole at In
and comprises two similarly formed main mold
55 sections or halves II and I2 which are substan
tially semi-cylindrical. The mold sections are
preferably provided on one side with projecting
portions l3 which are pivotally connected to
gether by means of a pintle_or bolt M. The sec
tions are provided also with projecting portions
15 which, when the sections are in closed posi
tion provide a ?ller passage l6 which communi
cates with an upright feeder passage ll, formed
by providing cooperating vertically extending
semi-cylindrical recesses 18 in the abutting faces 10
of the mold sections.
The split mold sections II and I2, when closed,
form a central core cavity within which is located
a core C. This core may be of suitable material,
and in the present instance, by way of example, is described as a sand core. Into this cavity, in
the space between the core and each mold section
wall at points at opposite sides of the central
vertical plane normal to the vertical plane coin
cident with the line of split of the sections, there ‘20
are insertable supplementary mold members
which cooperate with the mold sections and core
to form portions of the piston slippers, bosses and
the diverging intermediate connecting struts.
Each mold section is provided with upper and 25
lower extensions or projecting portions 19 which
are vertically spaced apart and between which
strut forming members 20 are positioned. These
members 20 are mounted for horizontal swinging
movement between the projections I9 by means 30
of pintles or bolts 2 I.
The walls of the mold sec
tions are provided with cut-out portions and
openings 22 into the core cavity through which
the feet or free end portions 200. of the members
20 extend. Similar openings are formed in each 35
of the mold sections. The surrounding walls of
the openings 22 are formed to provide guide
means for the members 20 and serve to direct
said members into their proper positions within
the mold cavity. The walls of the sections be- 40
tween the openings 22 are provided with radial
holes 23 through which removable pins 24 are
inserted to form the wrist pin openings in the
piston bosses. By providing the curved ends
20a, which cooperate with the correspondingly
curved surfaces of the core and with the mold
sections the ?nished piston is formed with strut
members, herein shown as curved, which connect
the skirt with the piston pin bosses.
50
Referring particularly to Fig. 2 it will be noted
that the mold sections are provided with inwardly
extending flanges or portions 25, these being for
the purpose of locating in proper position a sand
core shown at C which is supported between the 55
2
' 2,120,833
bottom ledges of the mold sections and said
locaters 25.
When it is desired to cast a piston in the mold,
the core C is placed in properly located position
within one of the split sections.
The mold sec
tions H and I2 are then closed by relatively
swinging them about the pintle l4, assuming
the position shown in Fig. l. The supplementary
mold members 20 are then swung into their full
ll) line positions so as to project into the core cavity
section having openings into the cavity, spaced
projections carried by each of said mold sections,
and removable swinging supplementary mold
members carried by said projections and having
oifset free end portions insertable through said
openings into and out of position within said core
jacent walls of the mold sections. When the
cavity.
4. A split mold for casting pistons, comprising
core is in position it will be noted that a space is
provided between the ends 20a of the strut form
ing members and the adjacent faces of the core
a pair of cooperating hinged together mold sec
tions forming when closed a central core cavity,
and mold sections, and that other spaces are pro
section having openings into the cavity, a pair of
vided between the core and the mold sections and
its parts to form the ?nished casting. Molten
metal is then poured into the passage l6, ?ows
upwardly through the passage I‘! and out through
the feeder slot 26 into the interior of the mold
sections, ?lling the spaces surrounding the core.
After the metal has cooled and set, the members
28 are swung outwardly about their pintles 2|,
substantially parallel spaced projections carried
between and spaced from the core C and the ad
the pins 24 are removed and the mold sections
are separated, whereupon the molded casting and
the core may be removed.
I claim:
30
3. A split mold for casting pistons, comprising
a pair of cooperating hinged together mold sec
tions forming when closed a central core cavity,
a core insertable in said cavity, the wall of each
a core insertable in said cavity, the wall of each
by each of, said mold sections, and an independ
ent removable supplementary mold member piv
otally mounted'between each pair of projections
and having a laterally extending free end, insert
able through one of said openings into the core
cavity.
5. A split mold for casting pistons, comprising
a pair of cooperating hinged together mold sec
tions forming when closed a central core cavity,
a core insertable in said cavity, the wall of each
section having openings into the cavity, each of
1. A split mold for casting pistons, comprising ' said mold sections having at least one pair of
a pair of cooperating hinged together mold sec
substantially parallel spaced projections, a pintle .30
tions forming a core cavity to hold a core there
connecting the free ends of each pair of projec
in, each section having a pair of openings into tions, and a supplementary mold member mount
the core cavity located at opposite sides of the
center of its wall, and a pair of supplementary
mold members for each mold section and having
offset free end portions shiftable through said
openings into the core cavity between the core
and the walls of the sections.
2. A split mold for casting pistons, comprising
40 a pair of cooperating mold sections forming a
core cavity to hold a core therein, each section
having a pair of openings into the core cavity
located at opposite sides of the center of its wall,
and a pair of supplementary mold members for
415 each of said mold sections having offset free end
portions shiftable through said openings into the
core cavity between the core and the walls of the
sections and spaced therefrom.
ed for swinging movement upon each of said
pintles and having an offset free end portion in
sertable through one of said openings into the
core cavity.
6. A split mold for casting pistons, comprising
a pair of cooperating hinged together mold sec
tions forming when closed a central core cavity,
a core insertable in said cavity, the wall of each
section having openings into the cavity, verti
cally spaced pairs of projections carried by each
of said mold sections, and a supplementary mold
member having one end thereof pivotally mount
ed between each pair of projections and an offset 45
free end insertable through one of said openings
into said core cavity.
'
RAY E. DAY.
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