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Патент USA US3029492

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April 17, 1962
J. M. BURNETT-
3,029,482
MOLD CONVEYING SYSTEM
Filed March 30, 1959
3 Sheets-Sheet i
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INVENTOR.
JOEL M. BURNETT
BY
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_
April 17, 1962
'
'
Filed March 30, _1959
J. M. BURNETT
MOLD CONVEYING SYSTEM
A
3,029,482
'
5 Sheets-Sheet 2
April' 17, 1962
J. M. BURNETT
3,029,482
MOLD CONVEYING SYSTEM
Filed March 30, 1959
5 Sheets-Sheet 3
JOEL
BY
03mm,
M.
BURNETT
l
‘
FP
A 7' 70E/VHS.
3,029,482
ates
Patented Apr. 17, 1962
1
2
3,029,482
MÜLD CONVEYING SYSTEM
v
Joel M. Burnett, Chagrin Falls, Ühio, assigner, by mesu
assignments, to Bartlett-Snow-Pacilic, inc., a corpora
tion of California
Filed Mar. 30, 1959, Ser. No._ 802,769
16 Claims. (Cl. f2.2-4.0)
.
weight thereon will be alongside each newly set-out mold
and the weight easily transferred from the former to the
latter. Special weight conveyors are therefore unneces
sary, and it is no longer required to transfer the weights
longitudinally'from one point to another on the loop.
It is also an object of my invention to provide mold
handling apparatus operative to transport molds in the
manner indicated, including such lateral shifting of the
rIhis invention relates to an improved method of han#
same.
dling molds in a closed molding system and to apparatus 10
Other objects and advantages of the present invention
for the practice of such method.
will become apparent as the following description pro
The closed loop type of foundry system is of course
ceeds.
old and widely used and is basically comprised of a con
To the accomplishment of the foregoing and related
tinuous conveyor which defines the loop and, distributed
ends, the invention, then, comprises the features herein»
therealong, the various machines and devices needed for 15 after fully described and particularly pointed out in the
molding in flasks carried by the conveyor. The conven
claims, the following description and the annexed draw
tional distribution of this appurtenant equipment is such
ings setting forth in detail certain illustrative embodi
that the loop is, in effect, divided into a set-out zone in
ments of the invention, these being indicative, however,
which either a closed mold is placed on the conveyor
of but a few of the various ways in which the principle
or the cope and drag deposited for assembly while on the 20 of the invention may be employed.
conveyor, a pouring zone in which the molten metal for
In said annexed drawings:
the castings is poured into the closed molds, a cooling
FIG. l is a partially broken and somewhat simpliñed
zone for setting of the metal, and a removal zone where
top plan view of a molding system in accordance with
the molds are transferred to a shakeout machine for
the present invention;
separation of the castings and return of the molds to the 25
FIG. 2 is a vertical section as viewed from the plane
molding machine which serves the set-out zone. Each
of the line 2-_2 in FIG. l;
`
`
mold on the conveyor in such a system travels from the
FIG. 3 is another vertical section of the system taken
point of set-out successively through these zones in the
in the plane of the line 3-3 in FIG. l;
order indicated to the removal point, and the cooling re
FIGS. 4 and 5 are further vertical sections the planes
quired must take place between the pouring zone and the 30 of which are indicated respectively by the lines 4-4 andv
shakeout; the time for cooling is thus conventionally de
5_5 in FIG. 1.
termined by the speed of the conveyor and the afore
Referring now to the drawings in detail, the illustrated
said distance over which the casting is carried.
embodiment of the invention comprises a continuous car
lt is a primary object of my invention to improve such
type mold conveyor 10 arranged in a loop having straightl
a system by substantially increasing the cooling time, 35 parallel sides and semi-circular ends. Each car plat
without, as would normally be expected, increasing the
form 11 is of a width to accommodate two of the molds
over-all length of the usual closed loop or requiring the
12 to be handled in side-by-side relation with respect to
conveyor speed to be reduced.
the longitudinal axis of the conveyor, with the platforms
Briefly, such improvement is realized by providing at
shown being of a length each to support two outer and
least two laterally spaced lines of molds about the loop, 40 two inner molds.
‘
performing the set-out and pouring functions in one such
The car platforms 11 are of the configuration shown
line and the removal for shakeout in the other line, and
and articulated for passage about the curved ends of the
appropriately shifting the molds from one `line to the
loop, with the undercarriage of the conveyor including
other so that each mold moves, without interference, in
wheels 13, which ride on rails 14, and a universal type
an overlapping path or distance greater than the actual
of chain 15 which is driven by appropriate power means,
length of the conveyor. In the preferred embodiment of
not shown. As indicated earlier, the construction of
the invention to be described hereinbelow, two such mold
such conveyor, and the drive therefor as well, are known
lines are provided, the mold set-out and pouring are ac
and commercially available, such equipment being regu
complished in the outer line, the molds are shifted from
larly supplied, for example, by The C. O. Bartlett & Snow
the outer to the inner line just in advance of the set-out 50 Co. of Cleveland, Ohio, the assignee of this application.
station, and the molds are removed from the inner line
It will also be understood that the conveyor details are
at the side of the loop opposite that at which they were
not per se important in the present invention, and any
set out. Such handling will readily be seen substantially
known type of closed mold conveyor can be used as long
to increase the cooling time as compared to a conven
tional system occupying the same space, with, the new
arrangement actually serving the purpose of a system
twice as long in this preferred embodiment and the effect
even further increased should more than two mold lines
as the same will accommodate at least'inner and outer
lines of molds.
The molding machine located within the loop and des
ignated by reference numeral 16 is likewise conventional,
and a roller conveyor 17 extends substantially horizontally
therefrom at an elevation higher than the conveyor 1G,>
It will be further seen that this mold handling method 60 with its outer end approximately at the longitudinal cen
provides high rates of production even where space is
ter of the conveyor near one end of a straight side sec
limited, high molding rates usually requiring higher con
tion of the same. The cope and drag molds formed in the
veyor speeds, longer cooling times,- and usually longer
machine are moved by the machine operator along this
pouring zones. That is, as compared to a conventional
conveyor 17, and another operatory standing at the out!
foundry system of given size or area, the same space can 65 side `of the car conveyor 10 takes each drag, places the
be utilized in accordance with the invention to provide
same on the adjacent, outer half lof a mold car there
higher rates of production or the same rate of production
beneath and closes the mold with the cope.
`
as before can be realized in much less space than pre
The conveyor moves counter-clockwise as viewed in
viously used.
Y
FIG. l, and as the cars advance in such direction, they
The lateral arrangement and shifting of the molds as 70 are of course loaded in the same manner to form an outer
discussed provides an additional advantage when mold
line of molds. To assist the setting out of the molds, a
weights are employed, since a poured mold with the
vertical guide 18 depends from the end of the mold-sup
be used.
Y
-
3,029,482
3
4
vibrating shakeout rails 32 oi’ conventional type, and the
plying conveyor 17 and extends along the centerline of
the conveyor l0, with its bottom edge fairly close to the
top of the latter, thereby marking the division for the
mold advance is taken over by a shakeout mold puller
33 which is reciprocated by a fluid-actuated piston cyl
inder assembly 34. This mold puller, which is not shown
in FIG. l since it would unduly obscure the illustration
of the latter, is guided on rails 55 and has a depending
outer and inner mold lines.
Mold weights 19 are used in this illustrated embodi
ment and, for the moment, it will be simply noted that
such a weight is placed on each closed mold at this set
pivoted arm 36 which can swing out of the way to clear
the mold as the puller approaches and moves over the
out station.
samej` when the puller clears the mold, the arm swings
The pouring zone in this system may extend over the
area from the dashed line 20 about the conveyor in the
direction of its advance to the further dashed line 21,
with the molten metal 'being poured into the closed and
weighted molds in the outer line of the conveyor 10 over
such section thereof. It is not necessary for full and
proper understanding of the present improvements to il
lustrate particular structure for the molten metal handling
and pouring, since any suitable apparatus of this nature
down to a vertical stop position to engage behind the mold
for pulling in the manner indicated by comparision of the
full and dasher line representations of the mold puller
in FIG. 2. Such puller guides each mold across the
shakeout rails and deposits the same on an inclined roll
conveyor 37.
may be employed, but it will be seen that the zone for
The contents of the llaslf. are of course dropped by the
shakeout operation and fall to a vibrating shakeout con
veyor 38 which extends along beneath the power driven
pouring is of substantialy length in relation to the over-all
size of the loop.
conveyor 37. Such shakeout conveyor has a grid or parti
rolls 21, the shakeout rails 32, and a portion of the roll
ally opened ñoor portion, as indicated at 39 in FIG. l,
through which the sand from the ñasli falls into a hopper
46, while the casting continues to the end of the shake
out conveyor and falls therefrom into a liquid-containing
The poured molds on the conveyor 10 in the outer line
thereof move around the other end of the loop, the right
end in FIG. 1, and encounter a lateral transfer station des
ignated generally by reference numeral 22 at which they
castings cooling tank 41. The castings are picked up in
are shifted individually transversely from the outer line
to corresponding positions on the inner half of the con
veyor, thereby to form the inner mold line. The mech
anism here illustrated for such shifting comprises a verti
such tank by a conveyor 42 and carried thereby across
the mold conveyor 10 in upwardly spaced relation to a
cal pusher plate 23 arranged alongside the conveyor 1G,
with its bottom edge slightly above the top of the con
veyor 37 from the shakeout is transferred to a belt con
delivery point 43 outside the latter.
Each now empty mold flask moving along the roll con
veyor to clear the same and the area of this plate pref
veyor 44 and delivered by the latter to a roller platform
erably being somewhat larger than the side area of the
closed mold 12. Such plate 23 is reciprocably supported
available for re-use in the latter.
4S adjacent the molding machine 16 to be conveniently
In the arrangement illustrated, new sand for the molds
by means of two rods 24 secured to the outer side of the
same and slidably passing through stationary guiding
and supporting sleeve members 25. A fluid-actuated pis
ton cylinder assembly 26, with its piston rod 27 secured
centrally to the outer face of the plate, provides the de
35
is supplied through a ñoor hopper 46 outside the loop and
carried along a vibrating spill conveyor 47 which passes
beneath the molding machine 16, which is situated over a
grid topped spill hopper 48, to the aforementioned hopper
40 which receives the used sand from the shakeout
sired controlled reciprocation of Such plate, and a stop
28 is disposed at the inside of the conveyor 1G in op 40 machine. The new and used sand is transported by a
position to the pusher plate 23.
vertical elevator 49 to a rotating inclined screen cleaner 50
at the top of a storage bin 51. Tailings and the like pass
Accordingly, as each closed and poured mold 12 in the
from the lower end of the screen cleaner to a tailings
outer line moves alongside the normally retracted pusher
chute 52 which extends downwardly and outwardly over
plate 23, the latter is actuated through appropriate con
the mold conveyor 10 to a tailings box 53, while the
trol of its drive cylinder 26 to advance against the mold
clean sand of course passes through the wall of the screen
to push the same from the outer to the inner half of its
to the bin 51. The sand is withdrawn from the bottom
conveyor car, with the inner stop 2S of course limiting
of this bin, through a batch hopper 54, to a conventional
such shifting of the mold.
muller 55 which is also supplied with the binder employed
The poured molds now continue to advance in the inner
line of the mold conveyor through the set-out zone, be 50 by means not shown, and the mold or prepared sand is
delivered to a horizontal belt 56 which discharges the same
hind the guide 18. As each of these molds passes beyond
into the lower end of a second vertical elevator 57. This
the forward end of such guide, the operator shifts the
last elevator `delivers the sand to a prepared sand bin 58
weight .1.9 thereon to the newly set-out mold now outside
positioned over the molding machine 16 and having a
the former, this transfer requiring only a small lateral
and easily accomplished movement of the weight. The 55 bottom batch hopper 59 for supply of the sand to the
latter.
first considered molds, now disposed in the inner line, ad
It will accordingly be seen that mold cooling in this
vance along the loop through the pouring zone, in which
system takes place from the end 21 of the pouring zone,
the new molds of the outer line receive the molten metal,
or wherever within the indicated pouring zone the partic
to a removal point indicated generally by reference nu
60 ular mold was poured, back through the set-out area and
meral 29 at the other side of the loop.
At this removal point, each inner mold is intercepted
the pouring zone to the shakeout, whereas in a convention
by a pair of curved plows 30 which direct the same in
al conveyor system, cooling takes place only between the
wardly, olf the conveyor car and onto a line of power
pouring zone and the shakeout. With the two mold lines
driven rolls 31. The plows extend over the conveyor 10,
described, which may incidentally be reversed in the sense
while such rolls commence beneath the inner peripheral 65 that the pouring could be done on the inner line and
edge of the conveyor. Such take-ott arrangement will be
the other stations corerspondingly changed, a given
seen to utilize the power of the mold conveyor as the
foundry operation can be accomplished with a conveyor
initial motivating force for removal, the frictional drag
only half as long as one of conventional design. For
being sufficient to turn the molds and start them onto the
example, in a comparative mathematical analysis in which:
70
power driven rolls 31.
E=the
length between the portion of the loop between
With particular reference to FIG. 2, in which the mold
the shakeout and the start of the pouring zone;
conveyor 10 has for convenience been turned to be per
P=the length of that portion of the loop within the pour
pendicular to the plane of this section, the power driven
ing zone;
rolls 31 advance each poured, and now cooled, mold
angularly inwardly in the same general direction to 75 Dc=the pouring length of that portion of the loop from
3,029,482
5
the end of the pouring zone to the shakeout in a con
ventional loop;
'
’
Dn=the length of the portion of the loop from the end
of the pouring zone to the shakeout in a loop in accord
ance with the present disclosure;
Lc=the total length of the conventional loop;
Ln=the total length of the new loop;
S=the speed of the conveyor; and
T=the cooling time required on the loop,
with E, l?, S and T being the same in both loops for
proper comparison,- then in the conventional loop:
LFE-tintoc
6
with such weights being transferred laterally from poured
molds in another line to adjacent new molds in such
one line.
5. In the operation of a foundry system including a
closed loop mold conveyor, the steps of forming a first`
line of molds on such conveyor at a mold set-out station,
pouring molten metal in such molds as they advance on
the conveyor in said first line through a pouring zone,
transversely shifting each poured mold in the first» line on
the conveyor before the same returns to the set-out sta
tion to a laterally displaced position, with the poured
molds thus shifted forming a second line on the conveyor,
the molds in such second line being advanced through
the set-out station and a substantial distance therebeyond
together with newly set-out molds in the first line, and
thereafter removing the poured molds from the second
mold line on the conveyor.
6. In the operation of a foundry system including a
closed »loop mold conveyor, the steps of forming a ñrst
line of molds on such conveyor at a mold set-out station,
pouring molten metal in such molds as they advance on
the conveyor in said iirst line through a pouring zone,
shifting each poured mold inwardly on the conveyor as
the same approaches the set-out station to a laterally dis#
25 placed position, with the thus shifted molds forming a
Expressed another way, one mold conveyor of deiinite
length in accordance with the invention can therefore
serve the purpose of an ordinary mold conveyor twice as
second inner line on the conveyor, and removing the
poured molds from the second inner line at a region con
siderably beyond the set-out station, whereby each mold
long.
placed on the conveyor travels more than completely once
The other advantages of the invention discussed at the 30 around the loop and thus a substantial distance beyond
the point at which it receives the molten metal for cool~_
outset above are thus manifest in the illustrative embodi
ing of the same prior to removal from the conveyor.
ment described in detail.
7. The method set forth in claim 6 in which weights
Insofar as I am aware, the concept of shifting between
are placed on the newly set-out molds in the first line,
plural lines of molds on the same conveyor, and there
may be more than the illustrated two lines if desired, b3 CH with such weights being transferred laterally from poured
molds in the second line to adjacent new molds in the
with appropriate 'positioning of the work stations with
ñrst line.
respect to such lines is entirely new in the art, although it
S. A mold conveying system comprising driven con~
may be old simply to carry plural molds on the same con
veyor means for conveying at least two laterally adjacent
veyor car, without operative distinction in the handling of
the same. The transverse shifting which I have disclosed 40 lines of molds about a closed loop, means for delivering
can obviously be Aaccomplished by a wide variety of
mechanical devices other than the fluid cylinder specifical
new molds to a set-out station at which they are placed
on the conveyor means substantially uniformly in a ñrst
longitudinal portion of the same, means in advance of
such set-out station, in the direction of the conveyor
Other rnodes of applying the principle of the invention
may be employed, change being made as regards the de 45 travel, for shifting each mold which has moved about the
loop from the set-out station to such advance point lat- ,
tails described, provided the features stated in any of the
erally on the conveyor means to another longitudinal
following claims or the equivalent of such be employed.
portion
of the same, so that the molds thus returned to
I, therefore, particularly point out and distinctly claim
ly described.
as my invention:
the area of the set-out station can continue therethrough
1. The method of mold handling which comprises 50 without interfering with new molds placed on the con~
veyor means at said station, and means for removing the
forming at least two lines of molds that extend in lateral
thus shifted molds from the conveyor means at a region
ly spaced relation about a major portion of a closed loop,
in advance of the location of said means for shifting the
advancing said lines of molds about the loop, setting out
molds.
new molds in one such line, pouring molten metal in the
molds disposed in such one line, shifting the poured molds 55 9. A mold conveying system comprising driven con
from such one line to another line in which the poured
molds continue to move about the loop at least through
the place of setting out new molds and substantially
through the zone of pouring for such new molds in the
veyor means for conveying at least tWo laterally adjacent
lines of molds about a closed loop, means for delivering
the loop for subsequent handling.
tively closely in advance of such set-out station, said
new molds to a set-out station at which they are placed
on the conveyor means substantially uniformly in a first
longitudinal portion of the same, reciprocable mold shif one line, the poured molds thereby being cooled, and 60 ing
means >alongside the conveyor means at a region rela
thereafter removing the poured and cooled molds from
shifting 'means being operative to extend transversely over- Y
2. The method set forth in cla-im 1 in which said one
the
conveyor means to engage molds thereon and shift
line is the outer mold line of the loop and the molds are
shifted inwardly to and subsequently removed from an 65 the same from such first to another longitudinal portion
of the same, whereby such shifted molds can “continue
inner mold line.
`on the conveyor means with further molds placed thereon
3. The method set forth in claim l in which new molds
at the set-out station, and means for removing the thus
are formed within the loop and the poured molds removed
shifted molds from the conveyor means at a region in
from such other line are transferred to a shakeout station 70 advance of the location of said means for shifting the
likewise within the loop, the mold flasks being delivered
molds.
from the shakeout station to the place of forming the
l0. A mold conveying system comprising driven con
new molds.
veyor means for conveying at least two laterally adjacent
4. The method set forth in claim l in which Weights
lines of molds about a closed loop, means for delivering
are placed on the newly set-out molds in said one line, 75 new molds to a set-out station at which they are placed
spaanse
7
on the conveyor means substantially uniformly in a first
s,"
shifting means being in advance of the set-out station thus
means being operative to extend transversely over the
conveyor means to engage molds thereon and shift the
to shift the molds to clear the first mentioned conveyor
section for placement of new molds on the latter at such
station, and means for removing the molds from such other
longitudinal half-section of the conveyor at a region in
advance of said mold shifting means.
same from such ñrst to another longitudinal portion of
the same, stop means generally opposite said mold shift
further in that the new mold delivery means serves the
longitudinal portion of the same, reciprocahle mold shift
ing means alongside the conveyor at a region relatively
closely in advance of such set-out station, said shifting
ing means for limiting the extent to which the latter can
move the molds on the conveyor means, whereby such
shifted molds can continue on the conveyor means with
further molds placed thereon at the set~out station, and
means for removing the thus shifted molds from the
conveyor means at a region in advance of the location
13. The combination set forth in claim 12 characterized
outer half of the conveyor, and said mold shifting means
is disposed at the outside of the conveyor to push the
molds inwardly when advanced,
14. The combination set forth in claim 13 characterized
further in that said means for removing the molds com
prises curved guide means extending over the conveyor
for intercepting and directing inwardly the molds on the
inner half of the conveyor.
15. The combination set forth in claim 14 characterized
further by the provision of driven take-off conveyor means
arranged alongside the loop to receive the molds guided
new molds to a set-out station at which they are placed
from
the latter by said curved guide means.
on the conveyor means substantially uniformly in a iirst 20
16. The method of molding which comprises: advanc
longitudinal portion of the same, guide means extending
of said means for shifting the molds.
11. A mold conveying system comprising driven con
veyor means for conveying at least two laterally adjacent
lines of molds about a closed loop, means for delivering
longitudinally closely over the conveyor means at such
set-out station and defining the longitudinal conveyor
means portion to receive the new molds, means relatively
closely in advance of such set-out station, in the direc
tion of the conveyor meanstravel, for shifting each mold
which has moved about the loop from the set-out station
to such advance point laterally on the conveyor means
to another longitudinal portion of the same, so that the
molds thus returned to the area of the set-out Station can
continue therethrough without interfering with new molds
placed on the conveyor means at said station, and means
for removing the thus shifted molds from the conveyor
means at a region in advance of the location of said
means for shifting the molds.
12. In a foundry system including a closed loop driven
mold conveyor and having a pouring zone extending over
a peripheral portion of the same, means for delivering new
molds to a longitudinal half-section of the conveyor at
a set-out station at the same peripheral side of the loop 40
as such pouring zone but in advance of the latter, mold
shifting means reciprocable over the conveyor at a region
beyond the forward end of the pouring zone and opera
tive to shift the molds laterally on the conveyor to the
other longitudinal half-section of the same, said mold
ing a mold from a set-out station along a path that ex
tends in a first section thereof from said station and
through a pouring area, about a loop, and back through
the set-out station and pouring area in the same direction
as originally but in a second section of the path which
is laterally displaced with respect to the first section of
the same, the second section of the path thereby being
overlapped with the first in spaced relation; pouring metal
in the mold while in the first section of the path extending
through the pouring area, with the poured mold thus
being advanced along the loop and the overlapping second
section of the path for extension of its travel and there
fore increase in the time for cooling of the poured mold;
and subsequently removing the poured and cooled mold
for further handling.
References Cited in the file of this patent
UNlTED STATES PATENTS
453,056
972,108
1,123,914
Welsh _______________ _- May 26, 1891
Herbert ______________ __ Oct. 4, 1910
Munford ______________ __ Jan. 5, 1915
2,068,835
Wurster _____________ ..._ lan. 26, 1937
2,229,492
Christensen et al _______ __ Jan. 21, 1941
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