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Патент USA US2126097

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Aug. 9, 1938.
,
'H. 1.. DEMMLER
‘ ‘ ‘_ 7 2,126,997
MEANS FOR VENTING CORE BOXES
Filed April‘ 29, 1937
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2,126,097
Patented Aug. 9, 1938
ED STATES
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0F F! GE, ,
2,126,091;
7
"
MEANS‘~ FOR VENTING‘ GOREBO-XES'
Henry L. Demmier,, Kewanee, Ill.
Application' April1‘29‘; 1937i SeriaIINm 139;‘646‘
‘ 5.- Claims.
(01-, 22r~13)i
My‘ invention relates to’ molds or‘ core boxes‘ to aperture 5‘ through‘ which the Saudis forced into
be used in connection with- mold or- core making
machines: ofthe' type in which-a mold or‘corebox'
is clamped-I against- a sand container; from which
or sand is forced into the moldor- core box bycom
pressed‘ air.
An’ object“ of‘ my invention- is to provide‘ an
improved? means for venting the compressed? air
passing intoa mold or “core box, and also the at
l‘lll" mosph-eri'e air which» i's-present in an empty mold‘.
or core box, and at the sametime to prevent the
escape from’ the mold‘ or‘ core box of‘ the sand’
the mold; or‘ core box 6‘.
This mold or core box 6 isshown assupported
on bars 1"‘ resting» upon- the pressure head.- 2*, which
is in the form of'a cylinder slidably mounted“ on a or
stationary piston 8. The piston 8- has a vertical‘
bore‘ 9" communicating with a pipe I'D‘ connected
witha source of compressed air- or- other'pressure
?uid; whereby- ?uid under pressure maybe ad
mitted' to. the space between the piston 8 and=cyl*
inder 2‘ to force the mold- or; core box- it ?rmly
against the bottom plate 4' of the'sand' containers;
It‘ will be understood-‘thatthemold or core box-B‘
may- be of‘ any desired size or'shape, and’ thatthe
1W core’ boxes which is less liable to become clogged number, and arrangementv of“ the venting- means 15".‘
by particles of sand than are the venting means ' willdepend upon the size and‘ shape of‘ the mold’ or
core‘ box. The particularmold or- core box-I shown
now in use;
Another object is to provide venting- means for may be. considered as illustrative only, and! is pro,
core‘boxes which can» be more easily‘ cleaned of vided‘ with a laterally extending projection H
provided with my improved venting means, ind-1* 20
obstructing particles of-{ sand‘ than are the vent
which is forced thereinto;
‘
Another‘ object is to- provide venting means for
ing means now used.
‘
cated generally‘at l-2;. Similarventingmeans-t2:
are. also-indicated‘ as being provided in the bottom‘
of the box. These venting means i2“ may be of‘
core- boxes which are» more efficient ‘and have a
greater: capacity than» do the venting means now any; of’ the three types disclosed‘ in this applica;_—‘
tion.
25- in‘ use.
The particular type of venting means shown in
Another object is to- provide an inexpensive
Figures 2;, 3' and 4 comprises a tapered outer sleeve‘
ven-ti-ng- meansfor core boxes which ismore dur
able and longer-lived than theventing means now it which has a drive or press fit with .a-‘wall-l of.
the mold or core box 6, it being understood‘ that
used;
the term “wall” is used generically to cover aside, 30.
Other objects and advantages'will becomeap
bottom or top part of'the box, or- any projection
parent as. the description proceeds;
or- extension thereof-L This sleeve I‘3 has a. gen-J
In the drawing:
Figure I is a. vertical? sectional view, somewhat‘ erally cup-shaped recess M1 formed in its inner
end‘, and this cup-shaped recess communicates
diagrammatic; of’ a core box embodying my‘ in
with a plurality of‘ bores l5- arranged in the» form
vention, in‘ position in’ a core making’ machine;v
Figure 2‘ is a View‘ of ' an- inside wall of‘ a» core box" of‘ a circle about an enlarged central bore l6?
incorporating one embodiment of myinvention; which-‘may: be threaded as indicated‘ at I11;
As best shown in Figure 3, the centralf bore l6‘
Figure 31 is a» section taken on- the line 3‘—~3* of
and most of the cup-shaped recess I41 are ?lledz
Figure 2‘;
to. Figure 4 is a bottom view ofthe structure shown by a central member I8 having a threaded‘ stem 40
I-“EI1 which coacts with the threads H1 of‘ the sleeve
in‘ Figure 3;;
Figure 5' is‘ a sectionaliview, similar to Figure 3,,‘ l3. to securethe member and sleeve together; The
but showing a modi?ed form of my invention; and: member l81has'a tapered‘ upperend‘ 201 terminating:
Figure-6 isa sectionalv view, similar to‘ Figure 3' in an‘ edge 2.! which cooperates with» the'adjacent
edge‘ 22 of the sleeve F3 to provide a metered“ 45
45‘ but showing another modi?ed form of my-inven
annular slot 23 of such size that air can pass‘
ti‘on.
Referring to the drawing; I have illustrated in therethrough but sand cannot.
The‘ inner surface 24; of‘ the member I18 is flat;
Figure 1 a machine comprising a- frame- I which
supports-apressure head? 2-. and‘ a sand container 3. and; lies in the same plane‘ as the inner’ end‘ 25:
It will‘ be understood that. the upper end of’ the of the sleeve l3 and the inner surface 2610-17 the. 50.
sand container is closed, andii‘s provided with pip» adjacent wait of the mold or co-re'box d. It will
be understood’: that where a fine- grade of sand is
ing or‘ other suitable means. for supplying‘ com
pressed air or other pressure.
thereto.‘ The used, the annular slotv 23 must be quite small? to»
sand container is further‘ provided with a re- prevent: the passage of sand. therethroug-h», where-l
55; movable bottom plate- 1:,‘ provided with a. centrat as. when a. coarser quality of sanct is: used, a u.
Another object is to provide venting means for
2,126,097
wider slot may be used without permitting the
sand to pass therethrough. I therefore make
my venting means adaptable to different quali
ties of sand by making the member [8 removable
and replaceable by a different member having a
larger or smaller inner end, so that by providing
a plurality of members I8 of different sizes, the
wall of the mold or core box. In this form of my
invention I provide an outer sleeve 30 which is
press-?tted into the wall of the mold or core box,
as in the previous embodiments. The inner end
of this sleeve 30 is provided with a large cup
shaped recess 3| which communicates with a
plurality of bores 32 arranged in the form of a
circle about a large central bore 33.
mold or core box may be readily adapted for use
with different sands.
Where the member I8 is
screwed into thesleeve I3 as shown in Figure 3,
the inner end of vthe member I8 is preferably pro
vided with a kerf 21 for receiving the end of a
screw driver to be used in unscrewing the mem .
ber I8 from its sleeve I3. _ This removal and re
placement can be accomplishedv without removingv
the sleeve I3 from the mold or core box.
It is important that no projections or depres- '
sions be provided on the inner surface of the
mold or core box, but that this box have a smooth
inner surface exposed to the sand. I therefore
?nd it desirable to ?ll the kerf 21 with rubber or
other suitable material 28 which can easily be re
moved from the kerf 21 by means of a sharp tool
when it is desired to unscrew the member I 8.
I The sleeve I3 and member I8 have their inner
ends exposed to the blast of sand entering the
mold or core box through the ori?ce 5, and are
thereby subject to a grinding or abrasive action.
I therefore prefer to make the sleeve I3 and the
30 member I8 of steel or other suitable wear resist
ing material, and I prefer to harden the inner
ends of the sleeve l3 and member I8 to increase
their wear resisting properties. In some instances
it is advisable to harden the entire sleeve and the
entire member rather than their inner ends only.
While the width of the annular slot 23 is less
than the diameter of the grains of sand used in
the mold or core box, the annular slot in its en
tirety provides a relatively large opening through
40 which the air may freely escape from the interior
of the mold or core box. The air passing through
the slot 23 passes between the upper end of the
sleeve I3 and the enlarged head of the member
I8, and thence through the bores I5 to atmos
phere. It will be noted that the taper 20 of the
enlarged end of the member I8 provides forthe
end 35 providing an edge 36 cooperating with the
adjacent edge 37 on the outer sleeve to form an
annular slot 38, through which the air may escape
but which is too small to permit the passage of
sand therethrough. The inner end of the inner
sleeve 34 is likewise provided with a cup-shaped
recess 39 communicating with a plurality of bores
4Il_arrangedin the form of a circle about a central
bore 4 I. A member 42 is threadedly or otherwise
secured in the bore 4| and has an enlarged inner 20'
end 43 providing an edge 44 which cooperates with
the adjacent edge 45 on the inner sleeve to provide
a second annular slot 46 for the escape of air.
This slot likewise is too narrow to permit the
escape of sand therethrough.
25
It will be understood that where the member 42
is threadedly secured in the inner sleeve 34, this
member 42 is provided with a kerf 41 which may
be ?lled with rubber or other suitable material
43. The inner sleeve 35 may also be provided with 30
holes 49 for receiving the prongs of a tool used in
unscrewing this inner sleeve from the outer sleeve
35. These holes 49 may likewise be ?lled with
rubber or other suitable material so that a smooth
surface is provided for contact with the sand in 35
the mold or core box.
It is to be understood that my invention is not
limited to the particular form shown in the draw
ing, and that the scope of my invention is to be
limited solely by the following claims.
I claim:
7 1. Venting means of the class described, com
prising a box, a sleeve press ?tted thereinto, said
sleeve having a circular recess communicating
with a central bore and a plurality of bores '
length several times its width is much less likely
grouped about said central bore, a second sleeve
located in said central bore and having coopera
tion with an end of said ?rst named sleeve to
provide an annular slot for permitting passage
of air therethrough but for preventing passage CO
of sand therethrough, said second sleeve having
to clog than is a circular ori?ce having a'diameter
equal to the width of the slot. Such a slot is
therefore far superior to a plurality of such circu
bore and a plurality of bores grouped about said
central bore, and a member located in said last
free escape of any particles of sand which may
pass through the slot 23, and thereby reduces the
likelihood of clogging.
,
I have found that a slot of a given width and a
C!
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An inner sleeve 34 is threadedly or otherwise
secured in the bore 33 and has an enlarged inner
Li lar ori?ces, having the same theoretical venting
capacity. Furthermore, it is much easier to re
move any particles of sand which may become
wedged in such a slot than it is to remove par
ticles of sand becoming wedged in such circular
ori?ces.
-
I The embodiment shown in Figure 5 is identical
with that shown in Figures 2, 3, and 4, except
that in the embodiment of Figure 5 the member
l8—A and outer sleeve I3—A have a press ?t in
stead of being screwed together as in Figures 2,
3, and 4.
Where the member is press-?tted into its sleeve,
it is unnecessary to provide the member with‘ a
kerf such as the kerf v2'! of the embodiment of
,. Figure 3.
In the embodiment of Figure 6, greater venting
capacity is provided in a small area, and this form
of my invention is particularly desirable Where it
is essential to provide the maximum venting
75,, capacity in a small cavity or corner formed in the.
a circular recess communicating with a central
named central bore, said member having an end ,
located in said last named recess and cooperating
with an end of said second sleeve to provide a
second annular slot adapted to permit passage
of air therethrough but adapted to prevent pas
sage of sand therethrough.
60
2. Venting means of the class described com
prising a wall member having an aperture therein
providing an enlarged portion opening upon a side
of said wall member along a well de?ned edge of
predetermined dimensions about a predetermined
axis, a second member disposed in said enlarged
portion. having an end face and a tapering cir
cumferential face centrally located with respect
to said enlarged portion, said tapering face inter
secting said end face along a second well de?ned
edge having dimensions corresponding with and
slightly less than said ?rst dimensions to provide
a clearance between said edges to permit the
passage of air therethrough exclusive of core
sand, means for securing said members axially 75.
3
2,126,097
relative to each other, and means for connecting
of a predetermined contour, a second member dis
said enlarged portion to atmosphere.
posed in said compartment having a tapering face
3. Vent means of the class described compris
ing a wall having an aperture therein de?ning
a surface of revolution and providing an enlarged
portion opening upon the inside of said wall
of a cross-sectional contour similar to said ?rst
along a well de?ned marginal edge and an inter
nally threaded reduced portion opening into said
enlarged portion, means for venting said enlarged
10 portion to the atmosphere independently of said
reduced portion, and a headed member having
a marginally well de?ned end face threadedly
received in said reduced portion to a depth where
by said end face is approximately flush with said
15 wall and the marginal edge of said end face is
closely proximate to the marginal edge of said
enlarged portion to permit the passage of air
contour, said contours being slightly different as
regards their corresponding dimensions to provide
a clearance permitting passage of air between said
members exclusive of core sand granules of a pre
determined size, means for moving one member
relative to the other to vary the amount to said
clearance, and means for venting said compart 10
ment to atmosphere.
5. Venting means of the class described com
prising a sleeve, a second sleeve disposed in said
?rst sleeve with su?’icient clearance therebetween
to provide a restricted slot permitting passage of 15
air therethrough to the exclusion of core sand,
and a member disposed in said second sleeve with
clearance between said member and said
therebetween exclusive of core sand, the headed
portion adjacent said enlarged portion having a second sleeve to provide a second restricted slot
20 circumferential face de?ning a second surface of ‘permitting passage of air therethrough to the 20
exclusion of core sand, means for detachably se
revolution inclined to said ?rst surface of revolu
tion whereby the clearance between. said headed curing said sleeves together and said members to
member and said enlarged portion is relieved said second member, and means for venting said
behind said marginal edges.
4. Venting means of the class described com
prising a wall member having a compartment
on a side thereof bounded by a well de?ned edge
slot to the atmosphere.
‘
HENRY L. DEMMLER.
25
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