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Патент USA US3100326

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Aug. 13, 1963
JEAN-JACQUES GERARDIN
3,100,321
PROCESS AND DEVICE FOR PRODUCING FOUNDRY CORES
Filed Nov. 20, 1961
5 Sheets-Sheet 1
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Aug- 13, 1963
JEAN-JACQUES GERARDIN
3,100,321
PROCESS AND DEVICE FOR PRODUCING FOUNDRY CORES
Filed Nov. 20, 1961
3 Sheets-Sheet 2
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Tenn-Egan ééRARD/N
AHormey
Aug- 13, 1963
JEAN-JACQUES GERARDIN
3,100,321
PROCESS AND DEVICE FOR PRODUCING FOUNDRY CORES
Filed Nov. 20, 1961
3 Sheets-Sheet 3
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Tanya; GERARD/N
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AH'Orney
United States Patent O?ice
'
32,100,321‘
Patented Aug. 13, 1963
1
2
In the drawings:
3,100,321
FIG. 1 is a longitudinal sectional view of a device ac
PROCESS AND DEVICE FOR PRODUCWG
FOUNDRY CORES
cording to a ?rst embodiment of the invention, this view
corresponding to the device in the state of rest before
Jean-Jacques Gerardin, (?les-Jean, Pont-a-Mousson,
?lling with sand, the upper part of the core-box having
been replaced by an extension part;
France, ' assignor to Compagnie do Pont-a-Mousson,
Nancy, Meurthe-et-Moselie, France, a corporation of
France
Filed Nov. 20, 1961, Ser. No. 153,588
Claims priority, application France Dec. 3, 1960
' 2 Claims.
(CI. 22-10)
FIGS. 2 and 3 are respectively cross-sectional and hori
zontal sectional views along lines 2—2 and 3-3t respec
tively of FIG. 1;
10
FIG. 4 is a sectional view similar to FIG. 1 of‘the de
The present invention relates to the production of
vice after it has been ?lled with said or a mixture con
foundry cores composed of sand or a mixture comprising
sand ‘and having a reinforcement, by means of metal core
taining sand;
boxes having two parts separated in a horizontal joint
of FIG. 4;
plane.
Usually a reinforcement longer than the core is pro
> vided so that its ends project from the latter and can be
used when handling the core. According to a known
method, in the course of production of the core, the
FIG. 5 is a cross-sectional view taken along line 5—5
15
_
‘
FIG. 6 is a View similar to FIG. 5 after the box has
been ?lled with sand and the extension portion has been
removed;
FIG. 7' is a longitudinal sectional view of the device
according to the invention in a position for compressing
reinforcement which is previously placed in the lower 20 or packing the core between the two parts of the core-‘box;
part of the empty core-box rests at its ends on rigid sup
ports on said lower part. The sand or mixture contain
FIG. 8 is a sectional view taken along line 8~—8 of
FIG. 7;
'“
'
ing said is poured in excess amount, the upper part is
FIG. 9 vis a partial longitudinal sectional view of. a
pressed onto the lower part of the box, for example by
modi?cation of. the device shown in FIGS. 1-8;
means of a press, and the sand is packed or compressed 25
FIG. 10 is a cross-sectional view taken along line 16
10 of FIG. 9; I
inside the box in a manner which is not at all uniform.
Indeed, the rigid reinforcement which rests at its ends
FIG. 11 is a plan view corresponding to FIG. 9;
on supports which are also rigid constitutes an obstacle
FIG. 12 is a partial perspective view of the modi?ca
tion shown in FIG. 9;
to proper packing of the sand. As a result, the part of
the core located behind this obstacle is less compressed 30
FIG. 13 is a plan view of another modi?cation of the
than the zone in which the obstacle does not exist. This
device;
_
-
unequal compression has an adverse eifect on the solidity
of the core.
FIG. 14 is a sectional view taken along line 14--14
of FIG. 13;
.
.
Further, if the reinforcement is insu?‘iciently rigid, that
FIG. 15 is a longitudinal sectional view of a second
is, if it is capable of elastically bending under the sand 35 embodiment of the invention, the device being shown in
compressing force, it tends to resume its straight shape
position for ?lling the core-box;
when it is no longer subjected to this force and is liable
to break the core in so resuming its straight shape.
The object of the invention is to eliminate these disad
vantages.
The invention provides a process of producing a foun
dry core provided with at least one reinforcement in
FIG. 16 is a sectional view taken along line 16-16 of
FIG. 15, and
a
FIG. 17 is a partial sectional view similar to FIG. 15
40 of the device in position for compressing the core.
In the embodiment shown in FIGS. 1-8 the invention
is applied i013. metal core~box A (FIGS. 7 and 8‘) having
which the reinforcement is supported during the ?lling
two superimposed parts. 1‘ and 2 interconnected in a sub
of the core-box ‘with sand, after which this reinforcement
stantially horizontal joint plane I.
is released from any support during the compression and 45
The lower part 1 ?xed to a‘ table B comprises a mould
packing of the core.
Owing to this improved process, during the compres
tor impression 3 which is limited in the upward direc
tion on the joint plane I and is extended at its ends in
sion the reinforcement no longer rests on rigid supports,
accordance with the invention in such manner as to
but on the contrary freely rests in the sand so that it fol
form two vertical slideways 4 in each of which is
lows the movements of the latter and fully transmits there 50 slidably mounted a slide 5 of a support for a reinforce
to the compression force throughout its length without
ment 6. The supports 5 ordinarily rest in the lower
opposing local resistances.
position on the bottom of the lower part 1 (FIG. 1) in
‘which they are below the joint plane J. They are: rais
box having two parts separated in a horizontal joint plane
able to an upper position ‘above the joint plane by two
and improved so as to permit the application of said 55 jacks or rams V, for example having a single-acting
process. Said core-box comprises supports which are re
piston 7 and actuating rods 8‘ extending through the bot
tractable from the reinforcement of the core and are
tom of the lower part 1. The upper position of the
mounted in the lower part of the core-box.
reinforcement 6 is determined by the abutment of the
In an embodiment of the invention, the supports for
piston 7 against the table B. The rams V are connected
the reinforcement are constituted by elements vertically 60 by a pipe 9 and- a common branch pipe 7 to one of‘ the
slidable in the lower part of the core-box.
ways of a three~way tap 11 of which‘ the other two ways
In another embodiment, the reinforcement supports are
are a supply pipe 12 of fluid under pressure‘ and? a dis
constituted by rods horizontally slidable in the lower
charge pipe 13‘. The upper part 2 of the core-box
part of the core-box.
(FIGS. 7 and 8) comprises in the known manner a
Another object of the invention is to provide a device 65 mould or impression :15 which is connected to thelmould
for producing foundry cores comprising the combination
3 of the lower part 1 in the joint plane J.
of the aforementioned core-box and means for actuating
The core-box is used in the following way:
the retractable abutments of the core-"box.
Placed on the lower part 1 of the core-box is an upper
Further features and advantages of the invention will
extension box 16 (FIGS. 1-3) adapted to measure the
be apparent from the ensuing description, with reference
amount of loose, that is, uncompressed sand which must
to the accompanying drawings to which the invention is
be provided to constitute the required core. The tap
Another object of the invention is to provide a core
in no way limited.
11 is so turned as to connect the discharge pipe 13 to
3,100,321
.
-
4
supports 5a in the lower position. The core-box is used
the pipes 10 and 9 leading. to the rams V. The sup
ports 5 are then in the lower position.
Before ?lling with sand, the tap 11 is turned so as,
to connect the pipes 9 and 10 to thesupplyrpipe 12
(FIGS. 4- land 5). The rods 8 of the pistons 7 then
simultaneously raise the twosupports 5- which raise the
reinforcement 6 to ‘the upper position shown in FIGS.
4 and 5. It is in this position that the core-box is ?lled
in the same manner as the previously-described core
box.
,
In the modi?cation shown in FIGS. 13 and 14, the
invention relates to a core-box having a curved rein
' forcement 6b.
In this case, this reinforcement is not
only supported at its ends by the supports 5, which are
, identical to the previously-describedsupports, but it is
i ’ also supported in its middle part by, a support 5a which
with sand S or a mixture containing foundrysand in—
tended to constitute the core. ' The'?lling is carried out 10 is the rod of the piston 7b of the jack or ram V1, this
rod being su?iciently upwardly extended to pass through
the lower pant 1b of the’core-box and support the rein
either manually or by gravity, or by blowing by means
of ‘a core blowing machine of known type. The ?lling
is continued up to the upper edge of this box 16, after
which the top 11
returned to the position shown in
forcement 6b. The ram V1 is connected to the supply
pipe 9 in the same way as the rams V disposed under '
FIG. 1 so as“ to connect the rams V to the discharge. 15 the ends of the reinforcement 6b so as to actuate the
The pistons 7 and the supports 5 of the reinforcement 6
descend. However, the reinforcement 6 does not de-'
scend since it is supported throughout its length by the
V 6). The box 16 is then withdrawn (FIG.
‘sand S (FIG.
6) and is. replaced by the upper part 2 of- the core-box 20
(FIG. 7) for packing or compressing the core N. =
The application of the upper part2 of the core-box
ample downwardly so- as to compress the sand of the
core N.
This is the core packing stage. 7 In the course
of this packing, the reinforcement 6 moves downwardly
in translation while retaining a horizontal position under
the effect of the pressure of the sand previously contained
in the box 16 the volume of which sand is reduced.
Owing to the constant level‘of ?lling of the sand in
the box :16, the packing pressure of the sand is uniformly
distributed throughout the length of the mould or im
supports for the reinforcement 6 are horizontally‘ mov
able instead of being vertically movable.
The lower part 1c of the core-box is provided at its
ends with apertured elements 21 on which are ?xed guide
on the lower part :1 is preferably effected by means of ' ‘
' a press whose bolster 17 (FIGS. 7 and 8) moves for eX- ' Q
supports 5. The three rams therefore operate simul
taneously in the manner described in respect of the first
embodiment.
In another embodiment shown in FIGS. 15-17, the
bushings 22., Horizontally slidable in the latter are rods
50 extending through the elements ‘21. .These rods act
as supports for the ends of the reinforcement 6 and
. have a‘ ?at-shaped cross-section. ‘Bach rod comprises
a v?ange 23 constituting an abutment engageable with
the bushing 22 and a push button 24 which also forms
an abutment engageable with the bushing 22 and acts
vas a support for a spring 25 compressed in a housing
formed in this bushing. Each rod 5c further comprises
a locking recess 26 with which co-operates a vertical lock
ing pin 27 extending through the bushing 22 and rigid
pression on each side of the reinforcement 6. .
with the piston 28 of a jack or rain V2.
Owing to the fact that the reinforcement 6yis em
bedded in the sand and removed from any rigid support,
it wholly transmits to the portion of sand located in
There are two
the lower mould 3 the pressure transmitted to the >
rams V2 corresponding to the two ends of the reinforce
ment 6.: When these rams are-under pressure the lock
fing pins 26 lock the rods 5c in the position in which
joint plane I. 'Ihe'reinforcement 6 is then substantially
by the expansion of the released springs 25.
they support the reinforcement 6 (springs 25 compressed)
reinforcement by the portion of sand located in the
upper mould 15 of the core-box.
40 as can be seen in ‘FIG. 15. When the rams V2 are con~
nected to ‘the discharge (FIG. 17) the pins 27 descend
. The core has been completely compressed when the
and release the rods 5a which are withdrawn outwardly
lower part 1 and upper part 2 are in contact in the
By means of this device, the core-box is ‘used in the
centered in the core N and, owing to the fact that the
travel of the piston 7 of the rams V is chosen‘ to be
gslightly greater than the extent to which the reinforce
ment 6 is displaced under the effect of the packing of
the sand at the end of the sand packing operation, this
same manner as that described hereinbefore.
In their
state of rest, the rods 50 are ordinarily outwardly with
drawn (FIG. 17), the rams V2 are put under pressure
so as to tend to raise the looking pins 27'. The push
buttons 24 are depressed manually and the rods 50 are
' reinforcement remains, out of‘contact with the supports
5 whose llower position is below the joint plane I (FIGS. 50 retained in their operative position by the pins 27 which
7 and 8).
V e
I
I
'
The upper part 2 of the core-‘box is removed after
~ the press holster 17 has been raised.
Then the core N, ,
which ‘is taken hold of‘by the ends of the reinforcement
6, is withdrawn.
.
engage the recesses 26. The reinforcement 6 is then
placed‘ on the rods 50 and the extension box‘1g6e is placed
on the lower part 10 of the core-box. After ?lling with
sand, the rams V2 are connected to the discharge pipe
so as to Withdraw the rods 50 (FIG. 17). The sand
is packed or compressed by means of the upper part 20
‘
Owing to the invention, the core N'is compressed
in a uniform manner and this imparts thereto strength,
of the core-box (FIG. 17).
' Although speci?c embodiments of the invention have
elasticity and uniform permeability to gases. Further,
been described, many modi?cations and changes may
is in no way deformed. It therefore remains stationary 60 be made therein without departing from the scope of
the invention as de?ned in the appended claims.
within the core after compression of the latter so that
the reinforcement 6 which moves freely with the sand
The core could be provided with a plurality of re
there is no danger of the core breaking. ‘
In. the modi?cation shown in FIGS. 9-12, the sup
ports 5 of the ?rst embodiment are replaced by sup~
.ponts 5a which have a U-shaped cross-section, are- pro
vided at their lower part with guide pins 18 and are
inforcements.
The core-box could be arranged to pro
duce a plurality of cores.
65
'
Having now described my invention What I claim as
new and desire to secure by Letters Patent is:
1. Process of producing a foundry core which has at
mounted 1 outside the core-box. To this end, the end
walls of the lower part of the coreabox are recessed at
19. Each recess is limited in the downward direction
least one reinforcement comprising the steps of placing
zont-al flange in the lower position and by their lower
to constitute the core, moving said support means rela
tive to the core-box and from under the reinforcement
the reinforcement in‘ the core-box on top of support
by'a horizontal ledge 20 which constitutes a shoulder. 70 means combined with the core-box-but movable relative
to the latter, ?lling the core-box with the sand intended
The supports 5a abut this ledge 20* by their upper hori
?ange in the upper position. These supports are 'actu
ated in the above-described manner by the rams V.
The reinforcement 6 rests on the upper ?anges of the
Without removing the reinforcement from the core-box
and thereafter compressing said sand in the core-box.
5
3,100,321
2. Device for producing a foundry core having at least
one reinforcement, said device comprising a core-box,
support elements on top of which the reinforcement is
placed and supported and which are carried by the core
box and are movable between a reinforcement supporting
position and a retracted position in which latter posi—
tion the support elements are Withdrawn from under
6
of the springs, and means for shifting the locking ele
ments between a retracted position in which they are
disengaged vfrom the support elements and a position in
Which they engage and lock the support elements.
References Cited in the ?le of this patent
the reinforcement, springs co-operating with the support
elements for urging the latter to said retracted position,
and locking elements movably mounted in the core-box 10
and engageable with the support elements in said sup
porting position thereof for locking the support elements
in said supporting position in opposition to the action
UNITED STATES PATENTS , r
1,663,455
Lukornski ___________ __ Mar. 20, 1928
13,616
528,389
Great Britain ________ __ June 1, 1901
Germany ____________ __ June 18, 19311
FOREIGN PATENTS
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