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Патент USA US2571769

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Oct. 16, 1951
2,571,766
T. sAULlNo
INJECTION Momma APPARATUS
2 SHEETS-SHEET l
Filed Aug. 8,' 1949
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Oct. 16, 1951
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INJECTION MOLDING APPARATUS
Filed Aug. e, 1949
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Patented Oct. 16, 1951
2,571,766
UNITED ¥sTA'rEs PATENT oFFicE
Theodore Saulino, Newark, N. J.
Application August 8,1949, Serial No. 109,110
'7 claims'. (o1. iis-s0)
1
.
2
.
My invention relates rto apparatus for press
moulding articles'such as injection moulding ma
chines Vand more particularly to improvements
vide a stationary platen `or cavity mould support
and a movable platen or'cavity mould support,
in the mold therefore.
able inter-platens or center plates which co
operate with the cavity vmould platens and may
also carry portions of the mould. This provides
multiple plane injection cavities permitting
. '
In apparatus of this kind the mechanism in
and intermediate these platensone or more mov
vwhich the molds are mounted usually comprises
Aa'stationary platen and a movable platen, these
molding in two or more planes, thereby increas
"“platens being closed in registering relationship
ing machine output and reducing unit cost.
“to‘permit plastic material to be injected into the
molds formed by the closure of the platens. The 10 The sprue and runners are so arranged that the
plastic material is forced first against the mov
Amaterial is usually fed from a machine nozzle
:through a sprue bushing having a sprue hole
able platen and then back through the one or
more center plates to the fixed platen for pur»
communicating with main and side runners, then
poses to be described. Various means are pro
'into gates terminating in the cavity proper.
'After the material is iniected into the cavities 15 vided for moving the movable platen, center
plate and Aknockout plates with their associated
andsets, the movable platen is moved away from
pins in a v.predetermined order so as to insure
‘the stationary platen andthe knockout pins car
ejection of the materiall formed in. the sprue
ried by knockout plate mounted o-n the platens
as Well asin-the cavity moulds.
_
lare >moved against the molded pieces to eject
20
Other obiects and advantages will be appar
sthem from the cavities.
ent from the kfollowing description of the inven
>‘Clne conventional apparatus .of this kind is
tion, pointed outgin- particularity in the ap
capable of producing a maximum or overall
pended claims and takenin connection with the
moulding pressure of 10 tons per square inch
accompanying drawings in which:
»with a clamping pressure of 300 tons, andv on
which approximatelyßû square inches of pro 25 lFigure 1 is a vertical section taken along the
line l-i of Figure v2; Figures 2 and 3 are vertical
jected area'can be‘molded at one time. The
sections taken along'therlines 2_2 and 3_3, re
movable platen rides on four tie rods. In some
spectively of Figure *1; Figure Llis a horizontal
cases, due to the area of the molded articles,
section taken along the line 4_4 of Figure 2;
'only a certain number of cavities can be made
in order that the mold can ñt in between the 30 Figure 5 is a longitudinal section taken along
the line 5_5 of Figure 2, slightly modified; and
press tie rods. Under these conditions the cavi
Figure 6 shows a partial longitudinal section of
ties may use only one half to two-thirds of the
a Amodification of the devices4 Shown in Figures
machine capacity, thus increasing the cost per
4 and 5.
i _
`_
`unit of article molded. .To increase capacity by
using multiple layer cavities introduces problems 35 lInasmuch as the'mechanis'm for injecting the
plastic material into the moulds and the rest of
of >injection and, hence, 4up to the present time
the moulding machine forms no part of the pres
has not been feasible. The problems involve the
ent invention, only the apparatus involving the
v'arrangement of the sprue holes, .the runners,
moulds per se, is> shown in the drawings and
the knockout plates and pins „and all the mov
'able parts of the moulding portion of the mold 40 described in connection with my invention.
ing machine.
Referring first to Figures 1 and 4, I provide
It is therefore Ya principal .object of my ín
in accordance with my invention a stationary
-vention to provide anV improved moulding ap
.platen or cavity mould support Ill, lil’ support
paratus in which the capacity of the device may
ing a plurality of cavity moulds il and movable
fbe increased.
‘
l
,
45 knockout plates l2 and i3 towhich are aiiixed
A more speciñc object of my invention is to
the knockout pins I4 which register with the
provide a multiple plane injection apparatus in
cavity moulds Il and are movable'therein when'
'Which it is possìble'to mold Aobjects in a plu
the knockout plates are operated to eject the
rality of planes. l
v
molded products. 'The knockout plate l2 also
Another object of my'invention is to provide 50 carries the sprue lock pins I5 for purposes to be
:an 'improved apparatus of this type having novel
described. The' stationary platen is also pro
:arrangement of sprue holes and runners mak
vided With the sprue 32 having the tapered sprue
fing’possible the use of multiple vplane injection.
hole 32’ and the enlarged portion _3l for receiv
A‘still further object of my invention is to
ing the end of the nozzle 30 through which the
provide a moulding apparatus using multiple 55 .plastic material is injected into the moulds «at
plane injection, having novel means for mov
the proper time.
-ing the intermediate platens or center plates
yGppositely disposedvto the fixed platen I0 is
the movable platen 20 which may be moved by
‘and the >knockout plates and pins.
These and otherobjects ywill appear herein
after.
n
'Briefly in accordance with my invention I pro
_
»
-the hydraulic mechanism. not shown, ofthe in
This platen is provided with -a
60 jection press.
»cavity mould support member’ll iixed to the
2,571,786
4
3
movable platen 20 by means of bolts 2l'. This
movable platen carries the cavity moulds 21.
in the fixed platen when the center plate 34 is
in turn moved to the left by means to be de
Movably supported within the movable platen
scribed when moulding has been completed and
are the knockout plates 22 and l23 supporting the
it is desired to eject the moulded objects. When
knockout pins 24 associated with the moulds and 5 movable platen 20 and center plate 34 have been
the sprue lock pin 25 and lock pins 25'. These
opened up to the desired ñxed spacing the knock
. knockout plates and pins are moved by the ejec
out plates are operated to eject the moulded
tor rod 26.
articles.
In accordance with my inventionl provide one
The mechanism for moving the center plate
or more center plates or intermediate platens 10 34 and knockout plates I2 and I3 will now be
34 which ride on the guide pins 35 mounted in
described. Various combinations and arrange
the fixed platen I0. This movable center plate
ments are utilized as described in accordance with
is provided with a bushing 33 into which the
my invention.
‘
sprue 32 is movable, and may be either flat or
Referring iirst to Figure 4, it will be observed
provided with the mold portions ll' and 21' co 15 that surrounding the guide pin 35 there being
operating with the moulds in the fixed and mov
four in number, is a compressed spring member
able platens.
56 and that stop pins 36 provided with enlarged
The arrangement of the cavity mould main
heads 36' are iixed to the fixed platen I Il. As
runner, side runners and gates opening into the
the movable platen moves to the left in Figure
cavity moulds are best shown in Figures 2 and 20 1 or upwardly in Figure 4 the springs 56 exert
3, which are vertical sections taken along the
a pressure against the center plate 34 to push
_lines 2-2 and 3-3 of Figure l. The movable
the plate away from the fixed platen as the mov
cavity mould support is provided with a plurality
able platen moves to'open position. The move
of cavity moulds 21 as shown. These are con
ment of the center plate is limited by the stop
nected to a main runner 4I) by means interme 25 pins 3B to the desired open spacing. The movable
diate side runners-4I opening directly through
platen continues to move to its predeter
.gates into the cavities. The plate is provided
mined open spacing in accordance with V hy
with the undercut portions opening into aper
draulic mechanism of V machine. The knock
tures 42 for the purpose of withdrawing the ma
out plates I2, I3, in iixed platen I0 may be op
terial in the runner 40 and the sprue 36’ when 30 erated by means of the hydraulic cylinders 51
the movable platen is moved to the left as seen
having pistons 53 fixed to plates I2, I3 for mov
in Figure 1. Knockout plates 22, 23 carrying
ing the knockout plates I2, I3. The ejector rod
knock-out pin 24 and lock pins 25 and 25' are
26 may be operated in various ways to move
carried by the movable platen. The center plate
knockout plates 22, 23. This action of course
34 may be provided with moulds or may be flat 35
` surfaced
depending upon the
article
to
be
forcàes the knock pins against the various molded
par s.
molded.
In a modiñcation shown for example in Figure
It will be noted that the sprue hole 32' communi
5, attached to the knockout plate I2 is a boss 53
cates with the runner 40 in the movable platen
supporting a rod 5I, having the head 52. The
and that material then ñows back through the 40 movable platen member has affixed thereto an
center plate through the passageway 44 and 45
apertured boss 50 through which the rod 5I ex
into the main runners 43, 44 having side runner
tends. In this arrangement no springs are uti
45 and 41. The plastic material should iirst be
lized for opening the center plate, this being ac
injected into the movable platen and then out
complished by the hydraulic cylinder 6I having
toward the front platen in order that the mould 45 the rod 60 connected to plate 34. As the movable
ed material in the sprue hole 32’ can be with
platen 20 moves away in accordance with its oper
drawn from the sprue hole, which is one of the
ation it picks up rod 52 with the boss 50 to
problems involved in attempting to provide multi
move knockout plates I2, I3 after the center plate
ple plane injection, Iaccording to my inven
34 has been moved by cylinder 6 I, it being neces
tion.
50 sary to synchronize the operation so that the
With the arrangement shown whereby the
middle plate and center plate move away prior
sprue extends through the center plate it is nec
to the operation of the knock out plates.
essary to move the center plate only a short>
In Figure 6 I show a still further modification
distance to permit the moulded articles to be
of my invention for operating the center plate as
ejected, since the movable platen moves the re 55 Well as the knockout plate in different arrange
quired distance for removing the material in the
ment. A hydraulic cylinder ‘61 is provided with a
sprue hole. If this were not done heavy springs
stepped piston rod 65 provided with shoulder 66.
.would be required in order to separate the center
After the movable platen member has been
plate and the fixed platen a sufficient distance
opened, hydraulic piston 61 is operated so as to
to remove the material in the sprue hole. This 60 move the center plate against its stop pin 36.
also has the advantage of eliminating the neces
The shoulder on the piston rod engages the knock
sity for a pin in the center plate to eject the
out plate to move the knockout pins against the
sprue, which would be required if the center plate
moulded objects to eject the same.
were relied upon to pull the moulded material
While certain speciñc embodiments have been
from the sprue hole.
65 described, it will be understood that various
In operation the movable platen 2li is first
changes and modifications may be made therein
moved to the left by suitable means, preferably
without departing from the spirit and scope of
by the hydraulic mechanism of the press. This
the invention.
'
platen in accordance with my invention is moved
I claim:
approximately lOl/è" in one machine so that 70
1. Apparatus for injection molding including a
the moulded pieces in the cavities 21 as well as
stationary platen having a plurality of cavity
the material in the sprue hole 32' and the ma
molds, a movable platen having a plurality of
teria1 in the sprue holes 45 and ‘46 is retracked
cavity molds, a movable intermediate plate coop
from` the passageways. The undercut portions
erating with both of said platens, ejector means
in the fixed platen retain the moulded Objevtâ 75 Carried by each of said platens, means for mov
2,571,766
6
5
moulds, a movable platen having a plurality of
ing said movable platen and other means for
cavity molds, a movable intermediate plate co
moving said ejector means when said movable
operating with both of said platens, runners in
platen and said intermediate plate are moved
said platens and in said plate for directing plastic
away from said stationary platen and from each
material into said molds, said fixed platen having
other for ejecting molded articles, said stationary
a projection having ,a sprue hole therethrough,
platen having a passageway extending there
said plate having an aperture through which said ~
through and said plate having passageways ex
projection extends, said -sprue hole communicat
tending therethrough- connected with said pas
ing with the runners in said movable platen, said
sageway of said stationary platen and with said
molds for directing plastic material into said 10 plate having other passageways communicating
with the runners in said ñxed platen whereby
molds.
2. Apparatus for injection molding including
plastic material directed through said sprue hole
a stationary platen having a plurality of cavity
passes iirst into said cavity molds in the movable
platen and then into the cavity molds in said Y
molds, a movable platen having plurality of cav
ity moulds, a movable intermediate plate cooper 15 ñxed platen, ejector means carried by each of
said platens, means for moving said movable
ating with both of said platens and in contact
platen and said plate and other means for mov
with each platen during molding operations, ejec
ing each of said ejector plates when said mov
tor plates carried by each of said platens and mov
able platen and said plate are moved away from
able with respect to said platens, means for mov
ing said movable platen and other means for 20 said stationary platen and from each other forvv
ejecting moulded articles.
moving each of said ejector plates when said
6. Apparatus for injection molding including a
movable platen and said intermediate plate are
stationary platen having a plurality of cavity
moved away from said stationary platen and from
molds, a movable platen having a plurality of
each other for ejecting molded articles, and means
for limiting movement of said intermediate plate, 25 cavity molds, a movable intermediate plate coop
said stationary platen having a passageway ex
erating with both said platens, means for moving
tending therethrough and said plate having pas
sageways extending therethrough connected with
said passageway of said stationary platen and
with said molds for directing plastic material into 30
said movable platen, ejector plates carried by
said molds.
3. Apparatus for injection molding including
a stationary platen having a plurality of cavity
molds in one face thereof, a movable platen hav
each of said platens, means for moving said mov
able platen and other means for moving each of
said ejector plates when said movable platen and
said plate are moved away from said stationary
platen and from each other for ejecting molded
articles, means including a stop rod on said fixed
platen for limiting movement of said plate, spring
ing plurality of cavity molds in one face there 35 means supported on said fixed platen for mov
ing said plate against said stop rod when said
of oppositely disposed to said first mentioned
movable platen moves away from said fixed
face, an intermediate plate cooperating with both
platen, said platens and said plate having run
of said platens and contacting said faces to close
said molds during molding operation, ejector
ners therein for directing plastic material to said
plates carried by each of said platens, means for 40 molds, said plate having passageways there
through communicating with said runners.
moving said movable platen and said plate and
'7. Apparatus for injection molding including a
other means for moving each of said ejector
plates when said movable platen and said inter
stationary platen having a plurality of cavity
molds, a movable platen having a plurality of
mediate plate are moved away from said sta
tionary platen and from each other for ejecting 45 cavity molds, a movable intermediate plate co
operating with both of said platens, means for
moulded articles from said cavity molds, said sta
moving said movable platen, ejector plates car
tionary platen having a passageway extending «
ried by each of said platens, means for moving
therethrough and said plate having passageways
said movable platen and other means for
extending therethrough connected with said pas
sageway of said stationary platen and with said 50 moving each of said ejector plates when said mov
able platen and said plate are moved away from
molds for directing plastic material into said
said stationary platen and from each other for
molds.
ejecting molded articles, means including a stop
4. Apparatus for injection molding including
rod on said fixed platen for limiting movement of
a stationary platen having a plurality of cavity
moulds, a movable platen having a plurality of 55 said plate, spring means supported on said ñxed
platen for moving said plate against said stop
cavity molds, a movable intermediate plate coop
erating with both of said platens, runners in said
rod when said movable platen moves away from
said fixed platen, said platens and said plate hav
ing runners therein for directing plastic material
material into said molds, said plate having a
sprue hole therethrough connected to the run 60 to said molds, said plate having passageways
therethrough communicating with said runners,
ners in said movable platen for first directing
means for moving said ejector plates including
material into the molds in said movable platen,
hydraulically operated piston members.
said plate having other passageways therethrough
`
THEODORE SAULINO.
connected between the runners in both platens
for directing plastic material from said movable 65
REFERENCES CITED
platen into the runners and molds in said i'lxed
platen, ejector plates carried by each of said
The following references are of record in the
ñle of this patent:
platens, means for moving said movable platen
and said plate and other means for moving each
UNITED STATES PATENTS
of said ejector plates when said movable platen 70
Number
Name
Date
and said plate are moved away from said sta
1,968,826
Graf ____________ __ Aug. '7, 1934
tionary platen and from each other for ejecting
platens and in said plate for directing plastic
moulded articles.
1,971,850
Ernst ____________ __ Aug. 28, 1934
5. Apparatus for injecting molding including a
stationary platen having a plurality of cavity 75
2,331,015
Dawes et al. ______ __ Oct. 5, 1943
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