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Патент USA US3066373

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ea. 4, 1962
w. B. JAY
3,066,363
CORE BOX FOR SAND CORES
»\
Filed Sept. 14, 1959
3 ‘Sheets-Sheet l
INVEN-TOR.
BYWM/Q/"d 5:0;
El?‘
4, 1962
w. B. JAY
3,066,363
CORE BOX FOR SAND CORES
Filed Sept. 14, 1959
3 Sheets-Sheet 2
Mu.wv-
INVENTOR
0
BY
$6
M//0/"0/
9.
5 Jay
I
Decn 4, 1962
w. B. JAY
3,066,363
CORE BOX FOR SAND CORES
Filed Sept. 14, 1959
is Sheets-Sheet 5
55/
55
f657556756/
INVEN TOR.
States Patent
?lice
B?hha'idd
Fatented Dec. 4, 1962
ii,
ll
blowing and core treating apparatus associated with the
3,066,363
novel core box.
CQEE EBGX FOR SAND (CQRES
FIG. 2 is a fragmentary top plan view of the blow
Wiiiard day, Dearborn, Mich.
Filed Sept. id, 1959, Ser. No. 8393678
Til Qiaims. {Cl. 22-16)
plate, sand nozzles and upper core box plate or cover
of the core box of the invention.
FIG. 3 is a fragmentary vertical cross sectional view
This invention relates to improvements in core box
through the core box of FIG. 2 taken along the plane
of the line 3—3 in FIG. 2.
FIG. 4 is an enlarged top plan view of one of the
sand nozzles or blow tips shown in FIGS. 2 and 3.
FIG. 5 is an enlarged side elevational view of the
sand nozzle shown in FIG. 4.
for sand cores. The principal objects of this invenLion
‘are:
First, to provide an improved core box for the forma
tion of sand cores for metal castings which core box can
be rapidly and uniformly ?lled with sand to form cores
of various shapes and which can be rapidly and eii'ec
FIG. 6 is a fragmentary transverse cross sectional view
tively cleaned of sand accumulations after each molding
through the sand nozzle taken along the. plane of the
operation by means of compressed air delivered through 15 line 6——6 in FIG. 5.
distribution channels within the core box itself.
Second, to provide a core box having a novel arrange
ment of vents for the escape of air trapped in the mold
As is well known many cast metal objects such as
internal combustion blocks are formed with substantially
inclosed cavities therein for the circulation of cooling
cavity and introduced thereinto during the molding op
liquid around the cylinder bores of the engine. These
eration, which vents are also capable of introducing
cleaning air and lubricants and core treating gases into
the core box during the molding operation or oscillating
sand in the cavity to polish and break in the box.
cavities are formed in the metal casting operation which
forms the engine block by providing relatively solid
sand cores molded to the proper Shape and positioned
in the metal mold to exclude molten metal from the
Third, to provide a core box with a novel form of
blow tip for introducing sand to be molded more di N) CR
rectly to all portions of the core being formed.
Fourth, to provide a core box with an upper part
having a blow plate and upper core box plate separated
by the heads of blow tips or sand nozzles extending
desired areas in the metal mold. It is common practice
to form these sand cores in the desired generally cylin~
drical shape and provided with suitable binding for the
sand so that the sand core will function properly in
the metal casting mold. This means that a preliminary
molding or casting operation is necessary to form the
through the core plate in such a manner as to leave 30 sand cores in the desired shape and for this purpose sand
exhaust vents or passages from within the core chamber
core boxes and molding machines are relatively common
to the exterior of the core box until the core chamber
in the foundry art.
is entirely ?lled with its intended charge of sand.
FIG. 1 illustrates somewhat conventionally a semi
Fifth, to provide a novel form of blow tip or sand
automatic sand molding machine in which a lower part
nozzle which is easily installed in an upper core plate
of a core mold box 1 is supported on a suitable verti
to form a break-off area directly along the desired upper
cal reciprocable table 2 for elevation into coacting closed
surface of the core formed in the mold and which is
relationship with the bottom of an upper core box part
extremely long lived and resistant to the abrasion of
the core sand directed therethrough.
‘Sixth, to provide a mold box for sand cores with a
combined upper plate and blow plate for coaction with
a conventional sand chamber and compressed air supply
in which the blow plate presents only inclined surfaces
to the body of molding sand transferred therethrough
to prevent the buildup of dead or stationary sand masses
and to provide adequate support for center areas of the
blow plate which are generally outlined and partially
or plate 3. Prior to being elevated by the table 2 the
lower core box part 1 is vertically supported on the
rollers 4- or a transfer rail 5. The table: 2 is adapted
to be elevated by the piston 6 of a ?uid actuated squeeze
cylinder ‘7. The piston 6 raises the core part i into
selected relation with the upper core part or plate 3 and
this plate is in turn connected to a blow plate 8 secured
to the underside of a sand chamber Q. The sand cham
her 9 is carried by a carriage plate lit? slidably supported
separated from surrounding portions of the blow plate
on the rolls 11 to shift the carriage plate and the sand
re?ll port 12 therein to underneath a sand supply chute
by elongated sand nozzles or blow slots for delivering
3.3 or an air pressure supply duct lid.
sand to all portions of an annular core.
The sand chamber and carriage plate are reciprocated
Seventh, to provide a mold for forming sand cores
between charge and delivery positions by the carriage
which is simple to operate in automatic molding appa~
ratus and which is extremely long lived.
core box is reciprocable horizontally onto and o?f of
Eight, to provide a core mold box and blow plate
which produces superior sand cores by reason of the
more direct delivery or" the sand to all portions of the
core without swirling motion of the sand or objection
able abrading action on the walls of the core box, and
by the provision of means for accurately locating and
maintaining the breako?' areas between the newly formed
core and sand remaining in the blow plate.
Other objects and advantages of the invention will
be apparent from a consideration of the following de
scription and claims. The drawings, of which there are
three sheets, illustrate a highly practical form of the
novel core box and sand nozzle or blow tip of the inven
plate operating cylinder 15.
The lower part i. of the
r the transfer track 5 to one or the other sets of support~
ing rolls 15 or CtSA on opposite sides of the rollover
cylinder 16 of a core drawing machine. The core box
l is reciprocated by the piston 17 of a cylinder 18, and
normally two or more lower core box parts 1 are pro
vided so that one core molding box can be ?lled while
another is having the freshly molded core withdrawn
therefrom.
The rollover cylinder 16 receives a core box on its
upper side and a core dryer or cover plate 19 is secured
over the newly molded core by a suitable clamp iii. The
rollover cylinder is then inverted to place the core box
in upside down position over the vertically reciprocable
core draw bars 21 carried by an upright draw cylinder 22.
The draw bars 21 are elevated to support the core dryer
chine.
or cover plate 1? after which the clamps it‘; are released
FIG. 1 illustrates somewhat conventionally a familiar 70 and the newly formed core lowered from the inverted
type of core molding apparatus with the novel core box
core box by the draw bars 21. The empty core box is
of the invention applied thereto and with additional mold
cleaned of residual sand during which time another core
tion as applied to a standard type of core molding ma
3,066,863
3
box is being ?lled and a core molded therein and the
new core box shifted to the empty upwardly facing side
of the rollover cylinder. Thus far the structure described
is generally conventional in molding shops and is described
projection of the ribs 4-8 is accurately controlled so that
the thickness of the vent passages 49 is less than the thick
ness of the grains of sand used in the core molding opera
tion so that while air can escape through the vents no
core sand can work its way into the vents.
mainly to point out the purpose of the novel features of
The upper ends of the blow nozzles 45 are provided
the invention.
with integral laterally projecting flanges 59‘ which rest
As appears more clearly from FIGS. 2 and 3, the lower
upon the upper recessed surfaces of the cover 3. These
part of the core mold box 1 has a bottom wall 23 having
?anges Silt de?ne laterally and downwardly opening
openings or holes 24 formed therein at spaced intervals
depending upon the shape and size of the core to be 10 grooves 51 which communicate with the vent passages 49.
The blow nozzles 45 are held down in the slots 4.3—44
formed. A bottom plate 25 closes off the lower ends of
and against the recessed surface of the cover 3 by a blow
the holes 24 but passages 26 formed in the bottom wall
plate 52 which ?ts into the recess 39 in the cover. The
connect the chambers formed by the holes to a laterally
blow plate 52 and the recess 39 in the cover are oppo
opening port 2'7 on the side of the mold box. The holes
sitely shouldered as at 53 and the dimension of the blow
or openings 24 receive and locate the necks
of cylin<
plate from the shoulder to its lower face is accurately
drical metal core members .29 which form and de?ne the
controlled to just touch the upper ends of the blow nozzles
inner surface of the sand cores to be formed. The metal
45 and hold them ?rmly in the slots 43—44. The space
cores 29 are hollow with vent chambers 34) therein com
between the lower surface of the blow plate and the upper
A
municating
plurality through
of angledthevent
necks
passages
28 with
Ell the
connect
chambers
the cen»
recessed surface or" the cover 3 thus forms a chamber 54
communicating with the upper ends of the vent passages
tral chambers 36 with annular collecting grooves 32
51 and 49. A laterally opening port 55 in the side of
formed around the undersides of the metal core cylinders
the cover 3 communicates with the chamber 54% for pur
2?.
poses which will be described in detail presently.
The extreme outer edges of the cylinders 29 outside
In the formation of cylindrical sand cores as for inter
of the collecting grooves 32 are cut or ground away
nal combustion engine blocks the central areas 551 of
slightly to provide thin vent passages 33 opening from
the blow plate 52 above the centers of the core cham
the surface of the metal core to the passages 31. The
bers are substantially separated from surrounding areas
vent passages 33 are wide enough to permit the flow of
of the blow plate by the series of blow slots 43 and 44.
air therethrough but are still narrow enough to prevent
In order to support these central areas 551 the thickness
the passage of molding sand into the vent passages. Simi- ‘
of the blow plate between the slots 43 and 44 is increased
lar upper inclined vent passages
and slots 35 at the
by the formation of radially extending ridges 56 to pro
upper ends of the metal cores vent the upper ends of the
vide an increased thickness of metal for resisting the
sand core chambers 37. The sand core chambers 37 are
pressure of the sand and air applied through the sand
de?ned by the walls '36 of the lower part of the core box
during the molding operation.
hese ribs or areas of in<
located in desired spaced relation to the metal cores 29
creased thickness 56 perform an additional function of
or by two adjacent [metal cores. As appears from the
forming downwardly inclined surfaces 57 completely
different thicknesses of the sand core chambers 37 in
around the slots 43 and 4M in the cover 3. The inclined
FIG. 3 these chambers can be made in any desired shape
surfaces 57 extend to and merge with the more sharply
or size by proper proportioning and positioning the walls
40 inclined side walls of delivery slots 58 which open at
of the core box and the metal cores therein.
their lower ends to the tops of the blow slots 46 in the
The upper part or cover 3 of the core box is secured
to the bottom of the sand chamber 9 as by cap screws 38
and has a central recess 39 formed in its upper surface.
The lower wall 4%} and face of the cover de?nes locater
holes 41 which receive upstanding pins 42 mounted on
the tops of the cores 29 to locate the lower part ‘ll of the
core box relative to the cover when the two parts of the
core box are joined by elevation of the table 2. The
lower wall 40‘ also de?nes a plurality of slots 43 and 44
with downwardly converging inclined side walls posi
tioned over the selected portions of the sand core cham
ber 37. Some of the slots 43 are curved to conform to
curved sections of the core chamber while other slots
such as 44 may be straight where the core chamber per
mits this con?guration.
Positioned in each of the
nozzle 45 formed of fused
highly resistant to abrasion.
the wear nozzle conforms in
slots 43 and 44 is a wear
ceramic or other material
It will be understood that
shape to the slot in which
nozzles 45. ‘It will thus be seen that from the upper sur
face of the blow plate 52 to the lower ends of the blow
slots 46, the core sand in the sand chamber is at all times
supported by a surface of more or less inclined shape
and position. This means that the downwardly directed
air pressure in the sand chamber will continually cause
all portions of the charge of sand to move downwardly
toward the blow slots 46 and into the core chamber.
There are no ?at areas on the top of the blow plate
where core sand can accumulate and harden to interfere
with successive core molding operations.
At the same
time central areas of the blow plate partially separated
from the surrounding parts of the plate are adequately
supported to resist the pressures existing in the sand
chamber.
Another feature of the wear nozzle 45 appears most
clearly in ‘FIG. 6 in which it is shown that the lower
end of the blow slot as is curved or converged as at 59
it is positioned. The nozzles 45 de?ne elongated blow 60 to provide a wearing edge of increased lateral thickness.
The undersurface of the blow nozzle below the wearing
slots 46 with downwardly converging wide walls so that
edge
is downwardly concave as at so in continuation
the blow slots taper downwardly in width. The nozzles
45 are carefully sized to ?t snugly in the slots 43 and 44
with the lower ends of the nozzles spaced upwardly from
the lower face of the cover and opening into shallow core
recesses 47 in the cover plate so that part of the sand core
formed in the core box is formed in the cover above the
lower part 1 of the core box.
The side walls of the wear nozzles 45 are provided
of the surface of the core chamber 47 in the cover 3
to form a smooth upper edge on the sand core formed‘
in the core bodies. The curved edge or lip 59 along the
bottom of the blow slot
performs two functions, the
?rst of which is to provide increased material in the
blow nozzle at the point of greatest wear therein. Since
all of the sand necessary to form the core and ?ll the
core chambers
must pass through the blow slots 46
with vertically extending laterally projecting ribs 48 at
spaced points therearound and the surfaces of these ribs
the greatest wear on the blow nozzles will occur at the
contact the converging surfaces of the slots 43 and 4-‘;
leaving thin vent passages 49 opening from the core cham
bers 37 to the recessed face of the cover. The height or
which must be worn away before a blow nozzle has to
constricted lower ends of the blow slots and the con
verged edges 59 provide additional material at this point
be replaced. A second function of the thickened lip 59
3,066,368
y... n
“.l
is to reduce the width of the sand sprue which projects
from the newly formed sand core into the blow slots 46
and which must be broken off cleanly when the upper
after the core is drawn onto the core draw bar 21, the
nozzle 64 is advanced into engagement with the port 27
to reversely blow air through the passages 26, chambers
part or cover 3 of the mold box is separated from the
and 3b to the vent passages 31-34 and slots 33-35.
This blow out air cleans the lower core box 1 and if
desired a lubricant for the surfaces of the mold box
can be introduced through the nozzle 64.
lower part it by reducing the width of the blow slot 46
at the converging edges 59. The thickness of this sprue
is locally reduced forming a natural breaking or parting
plane which separates the edge of the newly formed sand
core from the remaining body of sand in the blow noz
zles and the sand chamber.
The sequence of operation of the core molding appa
‘.l-fhile the inverted lower core box 1 is being emptied
and cleaned a previously cleaned core box on the op
posite side of the rollover cylinder ‘ll? can be moved to
the table 2. to start a second molding operation. The
ratus with the novel form of core box is as follows. The
nozzle 65 can be advanced into engagement with the
sand chamber carried by the carriage plate 1ft is moved
port 27 for the purpose of further cleaning the lower core
under the sand chute 13 by the carriage plate cylinder
box or for introducing a gas such as C02 for treating
151 to receive a charge of molding sand. The sand is 15 the newly formed sand core in the core mold box. The
impregnated with a suitable binder as is common. The
core mold box with the blow slot nozzles therein is thus
sand chamber 9 with the blow plate 52 and core box
easily cl ed and extremely long lived in use and pro
cover 3 attached thereto is then returned into registry
vides a superior sand core by reducing erosion and rough
with the air pressure supply pipe 14 and a clean empty
surfaces on the mold box surfaces and producing a clean
core box 1 is pressed upwardly by the table 2 and squeeze
‘areal; between the molded core and the sprue sand in
cylinder 7 into registering interlocked engagement with
the blow nozzles.
the cover
Air pressure is then applied from the supply
The arrangement of vents in the core box has an addi
conduit lid to the sand chamber to force the charge of
tional ft..ctonal advantage that is useful during “break
molding sand downwardly through the delivery slots 53
ing in” or polishing of the ?nished box. A small charge
and the blow nozzles
into the core chamber 37. As
of dry polishing sand, say 10% of the total volume of
was pointed out the raised ribs as on the surface of the
the mold cavity, can be put in. the bottoms of the several
blow plate support the central areas 551 of the blow
cavities 3‘? and a closure plate or seal clamped over the
plate and also form continually inclined surfaces along
which the charge of sand slides easily toward the blow
nozzles 4-5. By keeping the entire mass of sand in the
sand chamber moving it is possible to reduce the pressure
required from the air supply 14 in order to effect the
blow slots
causes the dry
in passing through the elongated blow slots as to the
core chamber, the sand is delivered directly downwardly
to substantially all areas in the core chamber 3'7 and
little lateral movement of the sand is required to ?ll all
portions of the core chamber. The sand emerging
through the blow slots 6 is directed primarily down
wardly and
not swirl or impinge directly on the [in
side walls of the core chamber 37 so that wear of the
parts is reduced.
Air initially present in the
core chamber 37 escapes through the thin vent slots 33
and f‘é‘ to the passages 3l-3d and the air chambers 3'!)
within the cylindrical cores 2%. From there the air is
molding operation. As the sand builds up and covers the
and commences to ?ll the core cham
prevent the polishing sand from escaping. By using
an automatic on-oif air valve the polishing and “break
ing in” can be accomplished without attention and at
little expense, and a smoothly operating core box is
assured.
l. Molding apparatus for sand cores comprising an up
per mold part plate with an upwardly shouldered recess
in its upper face and with a core forming groove formed
in its lo ver face, said groove being curved in part in the
contour of the core to be formed, said upper part de?n
sages 216 to the exhaust port 27 so that back pressure in
the core chamber does not interfere with a complete
bers $7 in the cover entrapped air and air intrained in
the molding sand can still escape through the inclined
vent passages 49 alongside of the blow nozzles 45 to the
is in the same desired direction as will be followed by
the charging movement of the core sand when the box
is put into service. The narrow vent passages 33, 35 and
What is claimed as new is:
exhausted through the chambers 24 and connecting pas
upper vent slots
This
to be blown up to the top of the
cavity and fall back down when the jet is turned off.
The vertical oscillating motion of the dry sand provides a
?nish polish on all surfaces of the mold cavity and the
polishing motion of the dry sand provides a finish polish
on all surfaces of the mold cavity. The polishing motion
complete transfer of the sand to the core box.
mold
Then an air jet can be introduced inter
mittently through t‘ne port 27 and passage 26.
50
ing a plurality of downwardly converging slots opening
at spaced intervals to the top of said groove, wear resist
ant fused ceramic nozzles ?tted in said slots and having
The sand chamber and cover 3
continuously downwardly converging inclined outer and
inner walls defining blow slots with inwardly curved wear
tips on their lower edges, laterally projecting ribs on the
outsides of said nozzles engaging the sides of the slots
in said upper part whereby vent passages thinner than a
grain of sand ‘being molded are formed between the outer
sides of the nozzles and the surfaces of said slots, lateral
ly projecting ?anges on the upper ends of said nozzles
supported on the upper surface of said upper part and
of the core box move to the left in PEG. 1 to receive a
de?ning downwardly opening grooves opening between
chamber
below the blow plate from where it is vented
through the port 55. With the charging or molding oper
ation complete, the lower part 1 of the core box is lov
ered away from the cover 3 and the sand sprues break
neatly along the curved edge 5% at the bottom of the
blow slots 46.
After the core parts are separated two simultaneous
operations take place.
second charge of sand, but prior to receiving the sand
the upper ends of said vent passages and the edges of
the nozzle at is advanced by the cylinder 62 into en
said ?anges, a blow plate positioned in the recess of said
gagement with the port 55 and air from the conduit 63 65 upper part and havin(7 a ?ange located by the shoulder
is applied to the upper core part to blow reversely through
on said upper part to rest the ‘bottom of the blow plate
the chamber 54-, notches Sit and vent passages
to clean
on the tops of said nozzles whereby the ‘bottom of the
out any sand which may have stuck to the lower ends of
blow plate and the top of the upper part de?ne a cham—
the vent passages All). The upper part or cover of the
her, said upper part de?ning a blow-out port opening to
core is thus quickly cleaned for a second molding opera 70 said chamber, a bottom mold box part de?ning a recess
with a central hole in the bottom, a hollow cylindrical
tion.
core member positioned in said recess with its periphery
spaced therefrom to de?ne a sand core chamber register
ing with the core groove in said top part, locater studs
dryer plate 19 and inverted as previously explained and 75 on each end of said core member received in the hole
The lower part or box 1 of the core mold is advanced
by the piston rod 17 on the transfer track 5 to the rollers
15 on the rollover cylinder and provided with a core
spouses
in the bottom of the lower part of said mold box and
a hole provided therefor in the bottom of said top part,
the lower stud being hollow and opening to the interior
of the core member, vent passages extending angularly
the upper ends of said nozzles supported on the upper
surface of said upper part and de?ning downwardly open
ing grooves opening between the upper ends of said vent
passages and the edges of said flanges, a blow plate p0
from the hollow inside of said core member to adjacent
sitioned in the recess of said upper part and having a
the end edges of the core member, the peripheral edges
of said core members terminating in slightly spaced re
?ange located by the shoulder on said upper part to rest
the bottom of the blow plate on the tops of said nozzles
lation to said mold parts to form vent slots narrower
than a grain of molding sand and opening to said vent
passages, said lower mold ‘box part de?ning a port open
whereby the bottom of the blow plate and the top of the
upper part define a chamber, said upper part de?ning
a blow-out port opening to said chamber, the bottoms of
said nozzles being downwardly concave continuations of
ing to said hollow stud, said blow plate de?ning a plu
the core recesses in the bottom of the upper part, a bot
rali'ty of downwardly converging delivery slots opening to
tom mold box part de?ning a sand core recess registering
and conforming with the blow slots in said nozzles, and
with said slots, said blow plate de?ning a plurality of
upwardly inclined surfaces radiating from all sides of
said delivery slots at a lesser angle than the sides of said 15 downwardly converging delivery slots opening to and con
forming with the blow slots in said nozzles as co-planar
delivery slots, said inclined surfaces forming a peak with
?ush continuations of said slots, and upwardly inclined
in the contour of said core chamber and radiating ridges
surfaces radiating from all side of said delivery slots at
between adjacent slots in the blow plate.
a lesser angle than the sides of said delivery slots, said
2. ‘Molding apparatus for sand cores comprising an
upper mold part, said upper part de?ning a plurality of
inclined surfaces forming a peal; within the contour of
downwardly converging slots opening at spaced intervals
said core chamber and radiating ridges ‘ etween adjacent
to the top of the core chamber of the part to be molded,
wear resistant nozzles ?tted in said slots and having
slots in the blow plate.
4. Molding apparatus for sand cores comprising an
upper mold part de?ning a plurality of downwardly con
verging slots opening at spaced intervals and arranged in
downwardly converging inclined inner Walls de?ning blow
slots, laterally projecting ribs on the outsides of said noz—
zles engaging the sides of the slots in said upper part
whereby vent passages thinner than a grain of sand being
molded are formed between the outer sides of the nozzles
and the surfaces of said slots, laterally projecting ?anges
on the upper ends of said nozzles supported on the up-
per surface of said upper part and de?ning downwardly
opening grooves opening between the upper ends of said
vent passages and the edges of said ?anges, a blow plate
positioned on said upper part and located by said upper
part whereby the bottom of tie blow plate and the top
of the upper part de?ne a chamber, said upper part de
?ning a blow-out opening to said chamber, a bottom
mold part de?ning a recess, a hollow core member posi
tioned in said recess with its periphery spaced therefrom
to de?ne a sand core chamber registering with the slots to. C3
in said top part, locater studs at each end of said core
member engaged with the bottom of the lower part of
said mold and the bottom of said top part, one of said
studs being hollow and opening to the interior of the
adjacent core part, vent passages extending angularly
from the hollow inside of said core member to adjacent
the end edges of the core member, the peripheral edges of
said core member terminating in slightly spaced relation to
said mold parts to form vent slots narrower than a grain of
molding sand and opening to said vent passages, one of 50
said mold parts de?ning a port opening to said hollow
the contour of the core to ‘be molded, wear resistant noz
zles ?tted in said slots and having downwardly converg
ing inclined inner walls de?ning blow slots, a blow plate
positioned on said upper part, a bottom mold box part
de?ning a recess with a central hole in the bottom, and
a hollow core member positioned in said recesses with
its periphery spaced therefrom to de?ne a sand core
chamber registering with the slots in said top part, 10
cater studs at each end of said core member received in
the holes in the bottom of the lower part of said mold
box and a hole provided therefor in the bottom of said
‘top part, the lower studs being hollow and opening to
the interior of the core member, vent passages extending
angularly from the hollow inside of said core member to
adjacent the end edges of the core member, the peripheral
edges of said core member terminating in slightly spaced
relation to said mold parts to form vent slots narrower
than a grain of molding sand and opening to said vent
passages, said lower mold part de?ning a port opening
to said hollow stud, said blow plate de?ning a plurality
of downwardly converging delivery slots opening to and
conforming with the blow slots in said nozzles.
5. Mold apparatus for making sand cores comprising
a lower mold part de?ning a cavity open at the top, a
hollow core member positioned in said cavity in spaced
stud, said blow plate de?ning a plurality of downwardly
converging delivery slots opening to and conforming with
relation to the side walls thereof to form a mold cham
her, an upper mold part arranged to ?t in contacting re
lation to the tops of said lower part and said core mem
the blow slots in said nozzles, and upwardly inclined sur
faces radiating from all sides of said delivery slots at a
ber, said upper mold part de?ning a series of elongated
slots of downwardly tapered shape arranged in the con
lesser angle than the sides of said delivery slots, said in
tour of said core chamber and opening thereto, wear re
clined surfaces forming a peak within the contour of said
sistant nozzles having downwardly tapering blow slots
core chamber and radiating ridges between adjacent slots
in the blow plate.
curved in part and intersecting in the contour of the core
to be formed, said upper part de?ning a plurality of down_
formed therein positioned in the slots in said upper part,
upright ribs on the outer sides of said nozzles seating
against the sides of the slots in said upper part and c0
acting therewith to form vent passages opening from said
mold chamber, said upper part de?ning a blow out port
communicating with said vent passages, locating studs co
acting between said core member and said mold parts,
the lower of said studs being hollow and opening be
wardly converging slots opening at spaced intervals to
tween the hollow interior of said core member and a co
the tops of said grooves, wear resistant fused ceramic
nozzles ?tted in said slots and having downwardly con
acting ‘blow out passage formed in said lower mold part,
3. Molding apparatus for sand cores comprising an
upper mold part plate with an upwardly shouldered re~
cess in its upper face and with a plurality of core form
ing grooves formed in its lower face, said grooves being
said lower mold part de?ning a blow out port commu~
nicating with said blow out passage, the end peripheral
verging inclined inner walls de?ning blow slots with in
wardly curved wear tips on their lower edges, laterally 70 edges of said core member being cut back to de?ne
grooves with the bottom of said lower mold part and
projecting ribs on the outsides of said nozzles engaging
the bottom of said upper mold part of lesser width than
the sides of the slots in said upper part whereby vent
passages thinner than a grain of sand being molded are
formed between the outer sides of the nozzles and the
the thickness of a grain of molding sand, said core mem
ber being formed with vent and blow out passages there
surfaces of said nozzles, laterally projecting ?anges on 75 in opening between the interior of the core member and
3,066,363
0
10
said grooves at the ends of the core member, and means
downwardly tapered shape arranged in the contour of
said mold chamber and opening thereto, the lower end
including a separate blow plate de?ning blow slots ar
ranged to deliver mold sand to said slots in said upper
of one wall of said core chamber being cut back to de
part, said plate presenting continuously downwardly in
clined surfaces between said slots in said upper part and
?ne a groove with the bottom of said lower mold part of
lesser width than the thickness of a grain of molding
the top of the blow plate.
sand, said lower part being formed with vent and blow
_
‘6. Mold apparatus for making sand cores comprising
out passages therein opening to said groove.
9. A blow tip for a sand core mold comprising a hori
a lower mold part de?ning a cavity open at the top, a
core member positioned in said cavity in spaced relation
zontally elongated body of abrasion resistant material and
to the side walls thereof to form a mold chamber, an 10
having continuously downwardly converging side Walls
de?ning a downwardly tapering slot, horizontally spaced
upper mold part arranged to ?t in contacting relation to
the tops of said lower part and said core member, said
upper mold part de?ning a series of elongated slots of
lateral projections on the outer side of one wall of said
body arranged to contact a supporting surface and space
downwardly tapered shape arranged in the contour of
said one wall from said surface by a distance less than
said core chamber and opening thereto, wear resistant 15 the thickness of a grain of molding sand to form a vent
nozzles having continuously downwardly tapering blow
passage, and a laterally projecting ?ange on the top of
slots formed therein positioned in the slots in said upper
said body overhanging said vent passage and having a
part, upright ribs on the outer sides of said nozzles seat
downwrdly opening recess on its underside opening be
ing against the sides of the slots in said upper part and
tween said vent passage and the edge of said ?ange, the
coacting therewith to form vent passages opening from 20 Walls of said body being thicker at the bottom of said
slot than at the top thereof.
said mold chamber, said upper part de?ning a blow out
port communicating with said vent passages, said down
10. A blow tip for a sand core mold comprising a
wardly tapering slots in said nozzles having inwardly con
verged sides at the bottom forming thickened wear tips.
7. Mold apparatus for making sand cores comprising
horizontally elongated body of abrasion resistant ma
a lower mold part de?ning a cavity open at the top, a
tally spaced lateral projections on the outer side of one
wall of said body arranged to contact a supporting sur
face and space said one wall from said surface by a dis
tance less than the thickness of a grain of molding sand
terial and having continuously downwardly converging
side walls de?ning a downwardly tapering slot, horizon
core member positioned in said cavity in spaced relation
to the side walls thereof to form a mold chamber, an up
per mold part arranged to fit in contacting relation to
the tops of said lower part and said core member, said 30 to form a vent passage, and a downwardly concave re
upper mold part de?ning a series of elongated slots of
cess on the bottom of said body curved transversely of
downwardly tapered shape arranged in the contour of
said slot.
said core chamber and opening thereto, wear resistant
11. A blow tip for a sand core mold comprising a hori
nozzles having downwardly tapering blow slots formed
zontally elongated body of abrasion resistant material
therein positioned in the slots in said upper part, upright
ribs on the outer sides of said nozzles seating against
the sides of the slots in said upper part and coacting
therewith to form vent passages opening from said mold
' and having downwardly converging side ‘Walls de?ning
a downwardly tapering slot, and horizontally spaced lat~
eral projections on the outer side of one wall of said
body arranged to contact a supporting surface and space
chamber, said upper part de?ning a blow out port com
said one wall from said surface by a distance less than
municating with said vent passages, one end of one wall 40 the thickness of a grain of molding sand to form a vent
of said core chamber being cut back to de?ne a groove
passage.
with the surface of said adjacent mold part of lesser
width than the thickness of a grain of molding sand, said
lower part being formed with vent and blow out passages
45
therein opening to said groove.
8. Mold apparatus for making sand cores comprising
2,049,732
Blake ______________ __ Aug. 4- 1936
a lower mold part de?ning a cavity open at the top, a
2,532,655
Backer ______________ __ Dec. :1, 1950
core member positioned in said cavity in spaced relation
2,605,596
2,688,780
2,807,064
2,864,134
2,899,724
Uhri ________________ __ Aug. 5,
Anderson ___________ __ Sept. 14,
Jay ________________ __ Sept. 24,
Harrison ____________ __ Dec. 16,
Peterson ____________ __ Aug. 18,
to the side walls thereof to form a mold chamber, an
upper mold part arranged to ?t in contacting relation to 50
the tops of said lower part and said core member, said
upper mold part de?ning a series of elongated slots of
References Cited in the ?le of this patent
UNITED STATES PATENTS
1952
1954
1957
1958
1959
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