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Патент USA US2107190

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Feb. 1, 1938.
2,107,190
v. s. SHAW
I PLASTI‘C EXTRUSION MOIJDING PRESS
Filed May l5, 1936
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PLASTIC EXTRUSION MÓLDÉIQNG PRESS
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N‘ Y UNITED STATES
/
PATENT Aor-‘Ficsl
2,107,190
¿R‘Eiss’uio
_
ruis'rlcnx'rausion Momma mss '
S. Shaw, Cardlngton. Ohio, asignar to
The Hydraulicrl’rese Oorporation. Inc.,v Wil
_mingtom Del., a corporation of Delaware Y
`
'Application May V1s, 193s, semi No. '19,054
412 Claims.
(CL 18--30)
presses, and especially'to extrusion presses for
with the lower portion shown in front elevation,
with the front of the machine removed to dis
molding thermoplastic materials 4like cellulose
closel the mechanism therein.
Y This invention relates to lnjectiomor extrusion
acetate, which can be re-softened and re-molded
5. by heat after cooling, as contrasted with mate
'rials like phenol resins which acquire a perma
nent set upon cooling.
One object of this invention is to provide an
extrusionpress having die members movable into
engagement with an injector, anda charging
and feeding arrangement for supplying measured
quantities of materials to the press.
,
Another object is to provide a *hydraulic cir
cuit including s'uch a press and charging and
feeding arrangement, in combination with pumps
Vfor operating the hydraulic plungers, which move
the dies and injector into engagement with onev
another, and which also operate the charging
and feeding mechanism.
-
Another object is to provide such' la press
wherein the charging arrangement is operative
ly connected to the feeding arrangement so that
the former distributes measured charges to the
20
- latter in proportion to the quantity required by
in Figures 1' and 2.
`
~
,v
’
Another object is to provide a charging and
feeding arrangement having means for heating
the thermoplastic materials'during the charging
and feeding operations,l together with means for
30 varying the temperatures applied to different
- portions of the press, although the heat is sup
plied from' a common source.
'
Figure 4. is a left-hand (end elevation of the
press.
' Figure 5 is a right-hand' end elevation of the
pl‘eSS.
Figure 6 is van enlarged view of a portion oi 10
Figure 5„ with portions of the casing removed to
show the interior mechanism, on the line l-.--¢
of Figure 2.
.
'
_
VFigurey 7 is a central vertical section through
the charging, heating and feeding arrangement 15
of the press.
»
Figure 8 is a‘detail view`of the mechanism in~l
terconnecting and synchronizing the injecting
mechanism with the charging mechanism.
Figure 9 is a view of the mechanism shown in
Figure 8, but partly in section, in a plane at
right angles to the view shown in Figure 8.
Figure V1i) is an enlarged sectional view of the
mechanism shown at the left-hand side of Fig
ure 9.
thelatter.
`
Figure 3 is a. top plan view oi’ the press shown
~
v Figui-all is'a diagrammatic sectional view of
the press audits hydraulic circuit, with the vari
ous plungers in a retracted position.
Figure 12 is a view similar to Figure 11, but
with thefdie members moved into engagement 30
with the injector, and with the injection opera- . -
tion about to take place.
`
lFigure 13 is a view similar to Figures 1l and '
Another object is to provide a, heating arrange
>ment for applying different degrees to ldifferent w12, but showing the positions of the parts and
parts o1' a machine, lthis heating arrangement control levers after the injection operation has
‘ consisting of means for heating a iiuid and dis
tributing this iluld to diiîerent partsv of the ma
chine, together with a by-passing arrangement
for by-passing a portion of the iluid past a cer
.tain part of the machine so as to lower the tem
taken place.
'
Figure 14 isS a plan view Voi' the extreme left
hand portion of Figure 7, showing the exterior
appearance oi the injecting and charging de
vices.
`
'
'
Figure 15 is an elevational view of the sup
perature of the portion which is lay-passed. _ l
_ Another object is to provide a hydraulic ex
porting structure for the mechanism shown in
trusion press having independent sources of sup
Figure 8.
plying pressure iluid to the die clamping cylin
ders and to the injection or extrusion cylinders
so that the clamping pressure may be maintained
at a different pressure level from the injection
' or .extrusion pressure or be kept `independent
y
General arrangement and hydraulic circuit
Referring to the drawings in detail, Figures 1
vand 2 show the press of this invention as con
sisting of a base, generally designatedJ Il, -form
-ing a frame for supporting the various portions
of the press, and also inclosing a iluid tank Il
In the drawings:
50
ï ‘ lFigure 1 is a iront elevation of the injection ' for containing the operating iiuid, such as oil,
by which the various` hydraulic' members are
or extrusion molding press of this invention.
Figure 2 is a view of the press shown in Figure> actuated. `Mounted upon the tank il are hy
-1, with the upper portion in vertical section draulic pumps I2 and I3, operated by a motor Il.
through the axis of the clamping plunger, and The'hydraulic pump I2 is of a conventional type,
thereof. 'f
65
~’
»
3,107,190
and is fitted with a pressure and volume control .
operated by the hand wheel I5. The latter acts
upon the variable stroke mechanism in the pump
Extrusion molding press construction
The extrusion molding press parts are mount
| 2 in suc-li a manner as to cause a variable out
ed upon the base l0 (Figures 1 and 2), and are
put oi' pressure fluid at working pressures, this
output decreasing to zero at a predetermined
clamping cylinder assembly 6| is mounted upon 5
maximum or peak pressure.
Such servomotor
control arrangements for hydraulic pumps areI
known to those skilled in the art, and the details
thereof form no part of the present invention.
The hydraulic pump I3, on the Aother hand, is
iltted with a pressure control operated by the
' hand wheel I6.
This control acts upon the vari
able stroke mechanism of the pump I3 in such a
manner as to give a lull volume delivery of pres
sure iluid at working pressures, the arrangement
reducing the output to zero at a predetermined
vmaximum or peak pressure. This control is also
known to those skilled in the art, and its details
also form no part of the present invention.
The pumps i2 and I3 are driven from the
motor |4 through the shafts l1 and I8, respec
arranged upon the top memberßl thereof. The
the left-hand side of the base top member 60,
the injecting cylinder assembly 62 is mounted
upon the right-hand end thereof, and the cush
ioning plunger assembly 63 is arranged between l
the assemblies 6| and 62,` these being intercon
nected by the strain rods “secured` thereto by
the nuts 65 (Figure 1l) threaded upon the ends
of the strain rods 64.
`
`
The clamping cylinder assembly 6| consists of
the cylinder bore 66, having the clamping pistonY
61 with the piston head 68 reciprocable therein.
At one end of the cylinder ~bore 66 the ’port 63 is
connected to the line 45 leading to the clamping
control valve 42. On the opposite side of the
piston head 68 is situated the port 1|I, connected
to -the line 46, likewise leading to the clamping
tively, (Figure 2_). 'I'he pump I2 receives iiuid
through the suction line |9, running from it to
the >tank il, and discharges pressure fluid into
control valve 42. The packing 1|, compressed by
trol valve 2| the lines 26 >and 21 run, respec
surrounding and engaging the strain rods 64
the gland 12 through the agency of the cap
I3 Cil
screws 13, prevents leakage from around the
the line 20, running to the injection. control . »clamping piston‘ 61. 'I‘he opposite end of the
clamping piston 61 from thel clamping piston
valve 2|. _The branch line 22 continues onward
head 68 has a reduced diameter portion 14, upon
from the pressure line 20, and distributes pres
sure fluid through the check valve 23 and the> which is mounted the die head 15 having the bore
30 line 22a to the pistons supporting one of the die
16 arranged to -receive the reduced diameter por- 30
tion 14. The outer ends of the die head 15 are
members, as hereinafter explained.
provided with bores 11 containing bushings. 18
From the ports 24 and 25 of the injection con
tively,- to the opposite sides of the injection pis
ment.
the end ports 28 and 28 the line 30 discharges
into the iiuid tank Il. The injection control
valve 2| contains a valve member 3|, having
valve heads 32 and 33, these being shifted bodily
The die head 15 is also provided with drilled
'portions 18 adapted to receive the bolts 80, for
securing the die member 8| thereto. The die
member 8|, in turn, is provided with a lateral
bore 82 arranged to receive a knock-out rod 63,
the central portion of which is provided with a
knock-out pin 84 mounted in the drilled portion
85 of the die memberfBI. The outer endsrof the
knock-out rod 83 are adapted to engage the ends
of the threaded-¿stops 86, these being mounted .in 45
the threaded bores 8.1 of the clamping cylinder
40 by means of the crank arm 34 operated by the
injection control valve hand lever 35.- As the
hand lever 35 is moved tn_,and fro the valve
heads 32 and 33 are moved upwardly or down
wardly within the valve 2| so as tov distribute
fluid either to the line 26 orto the line 21, 'as
desired.
".50
(Figure 11) so as to provide a sliding engage-`
ton of the press, as hereinafter explained. From'
'
-
35
The hydraulic pump | 3 receives iluid from the ` assembly 6|, and locked in position'by means of
tank || by way of the suction line 40, and dis’î the locknuts 88 (Figure 11). The purpose of the
knock-out rod 83 and knock-out pin 84 is to
charges pressure fluid through the line 4| lead
ing to the clamping control valve 42 (Figures 2 eject the molded piece from the die member 8|
when the rod 83 is 'carried back into contact
and 11). The line 4| is likewise connected to the with the >ends of the threaded stops 86 on the
branch line 22a between the check valve 23 and return motion of the clamping plunger 61.
the press. The check valve 23 prevents the re
The injecting cylinder assembly 62 consists of
turn flow of fluid .toward the pump |2 when the the cylinder bore 89, containing thev piston rod
55
pump I3 is operating, but when the pump |2
90 having the piston head- 8| securedat, one end,
is in a non-delivery position. From the ports 43 and the injector plunger 32 mounted`upon the
and 44 ofy the clamping control valve 42 the other end (Figure 11). 'I‘he cylinder b_ore 69 is
lines 45 and 46 lead, respectively, to the opposite
sides of the clamping -plunger of the extrusion
press, as hereinafter explained. From the line
provided with ports 83 and 84 at its opposite ‘
ends, respectively connected by the lines 26 and 60 .
45 the branch line 41 carries fluid to one side of
ing 95,-/compressed by the gland 86, prevents
the charging plunger of the press, the opposite
escape of fluid around the piston rod 80. Mount
_ed uponl the strain rods 64 and held in position
between the enlargements >|11 thereof and the 65
side of which is connected by the branch line
65
48 to the line 46, as hereinafter explained. 'I'he
clamping control valve 42 likewise contains a
21 to the injection control valve 2|. The pack
spacing bushings 98 engaging the injecting cylin
valve member 49, having spaced valve heads 50 . der assembly 62, is the cross-piece 89. This cross
and 5| arranged tobe moved to and fro by the; piece contains the cushioning cylinder bores |00,
crank arm 52, operatedby the clamping control having the ports I0| connected by the lines 22a
valve hand lever 53. The hand -lever 53 may be
moved in one direction orthe other to distribute
iiuid from the line 40 alternately to the line 45
or 46, as desired. From the end ports 54 and 55
75 the return line 56 runs to the-tank Il,
and 22 to the control valves 2| and 42, respec- 7 0
tively.
Mounted to reciprocate in the cylinder bores
|00 are the piston heads |02 connected' to the
piston rods |03, the opposite ends of which are
secured, as at |04, to the crosshead |05. The 75
i
`
f
>
3
9,101,190
leakage of fluid around the piston rods |03 is
prevented bymeans of the packings |06, ar
ranged to be compressed by the glands |01. The
crosshead |05 is provided with bores |09 con
taining bushings |03 adapted to provide sliding
engagement with the strain rods 64, the latter
having annular enlargements | I0 serving as stops
to limit the forward movement of the crosshead
|05.
'
Mounted upon the crosshead |05
thereto, as by the bolts ||| passing
holes ||2l is the die member ||3,
with the previously-mentioned die
and secured
through the
cooperating
member' 3|.
The die member ||3 is provided with a die
cess ||4 aligned with the recess I|5 in the
member 3|. Access to these recesses ||4 and
is provided 'by means of the passageway ||6
re
die
||5
ex
tending rearwardly through the die member ||3,
and terminating in the mouth ||1 (Figure ll).
Secured to the cross-piece 99, as by the bolts
||9 running through the bolt holes || 9, is the
injector cylinder |20, within the bore |2| of
which the injector plunger 92 operates. The in
jector cylinder |20 is provided with a nozzle or
nose portion |22, the tip of which is adapted to
fit snugly within the mouth ||1 of the passage
way ||6 in the die member ||3 when the latter
is moved into engagement therewith, as herein
after described.
The injector cylinder |20 is surrounded by a
casing |23, providing a chamber for the circula
tion of heating fluid for maintaining the molding
material in a plastic condition, as hereinafter ex
plained. Projecting laterally from the injector
cylinder |20 is a charging cylinder |24, similarly
surrounded by a casing |25 for providing a cham
ber 'for the circulation ofheating iiuid there
between. The charging cylinder |24 is provided
with a bore |26, within which the charging
plunger |21 is arranged to reciprocate. On the
oposite end of the charging plunger |21 is mount
ed the piston head |26, arranged to reciprocate
within the cylinder |29. The opposite ends of
the cylinder |29 are provided with ports |30 and
|3|, connected respectively to the lines ‘41 and 43,
previously described (Figure 11).
'
Material-measuring and charging arrangement
'I'he material-measuring and charging devices
are mounted upon a' hollow base |32, extending
rearwardly approximately at right angles to the
main portion of the press (Figure '1). The cylin
'der |29, containing the piston head |26 for op
erating the charging plunger |21, is supported by
inl the bracket |33 mounted upon the top portion
|34 of the base |32. The charging cylinder bore
|26 is aligned with a bore |35 (Figure '1), having
an aperture |36 in one side thereof.
y
Above this '
aperture |36 is arranged a funnel member |31,
adapted to direct materials through the aperture
|36 into the bores |35 and |26.
conveyor |46, mounted upon the shaft | 41 (Fig
ures 9 and l0), the latter being journalled in the'
anti-friction bearings |48 and |49, the latter be
' ing supported by the bracket |50 extending rear
wardly from the casing |40. Surrounding the 5
shaft |41 is a downwardly depending bracket |5|,
arranged to support the guide rollers |52 secured
thereto, as by the cap screws |53 (Figures 8 and
10). The outer end of the shaft |41 terminates
in a threaded portion |54 having the retaining4
nut |55 mounted thereon.
Surrounding 'the shaft | 41 for free rotation
thereon is the sleeve |56, containing the teeth of
the gear portion |51 and having mounted there
on the disc |58, carrying the stub shaft |59 upon
which is mounted the ratchet pawl |60. The lat
ter is arranged to engage the ratchet wheel |6|,
which is secured by the key |62 to the shaft |41.>
Supported by the .guide rollers |52 and arranged
to engage the teeth of the gear portion |51, is a 20
rack |63 (Figure 8), one end of which is pivotally
mounted upon the pin |64 secured to the split>
collar |95. The latter is clamped to the arm |66
by means of the bolt |61. The inner end of the
arm |66 is secured within the bore |69 in the
crank arm |69 mounted upon the end of the shaft
|10, and held in position by the nut |1| upon
the threaded portion |12 thereof (Figures 8 and
9.) The shaft |10 is supported in anti-friction
bearings |13, |14 and |15. The bearings |13 are
mounted in a bracket |16 secured to the bracket
|33. 'I'he anti-friction bearings |14 and- |15,
however, are mounted in a bracket |11, the lower
portion of which rests upon the top member 60
of the main base |0 of the press.
Mounted upon the oposite end of the shaft |10
from 'the crank arm |69 is a bifurcated arm |10
(Figure 9), the outer ends of which are pivotally
connected, as at |90,to links |19 (Figure 2). The
opposite ends of the links |19 are pivotally con 40
nected. as at IBI, to a collar |82 mounted upon
the piston rod 90. Consequently, the reciproca
tion of the piston rod 90 and the injector plunger
92 will cause the bifurcated arm |19 to rotate the
shaft |10, and move the arm |66 and the rack
|63 to and fro by amounts directly proportional
to the motion of the piston rod 90. As the rack
|63 moves to the left (Figure 8) it will rotate the
gear |51, and with it the disc |58, but the pawl
|60 will slip loosely over the ratchet wheel |6|
without engagement therebetween. Consequent
ly, no rotation is imparted to the shaft |41 during
the return motion of the injector plunger 92 and
its position- rod 90. During the injection
stroke thereof, however, the gear |51 and disc
|59 will be rotated in the opposite direction by
the motion of the rack |63 to the right (Figure
8), whereupon the pawl |60 (Figure 10) will op
eratively engage the ratchet wheel |6| and ro
tate the shaft |41. 'I‘he rotation of the shaft _|41 60
and screw conveyor |46 will cause material placed
|33, this projection on the upper side of the cylin
in the hopper |45 to move to the right (Figure 9),
and be expelled into the funnel |31 and thence
der |29 being adapted to support the charge-V
measuxing assembly, generally designated |39.
inder bores |35 and |26. The charging then 65
'I‘he cylinder |29 is provided witha projection
through the aperture |36, into the charging cyl
The latter consists of a casing |40, having a con
takes place by the action of the charging plunger
zontal cylindrical bore |42 connected therewith
ner subsequently to be described.
by the vertical passage way |43. The conical por
tion |4| is provided with an interior conical sur
face |44 adapted to receive the conical lower por
tion of a hopper |45. 'I‘he outer end of the bore
|42 is conected to the funnel |31, so as to dis
charge into this funnel. Arranged to rotate
within the bore |42 is a material-moving screw
Heating arrangement for maintaining materials
ical upwardly extending portion |4I and a hori- ` _|_21 as impelled by the piston head |29, in a man
in plastic condition
'
The molding material is maintained in‘a plas
tic condition by the circulation of heated oilaround the various chambers through which the
material passes. The oli is contained in a reser
70
4
2,107,190
voir |83 mounted within the base |32 and heated
by means o! an electrical heating unit |84, which
is connected by the lines |85 and |88 (Figure '1)
to the indicating thermostat |81 (Figure 1). The
oil is circulated from the reservoir |83, through
out the various chambers, by means of a pump
|88 driven by the- motor |88. The ñuid is drawn
` from the reservoir |83, through the passageway
|88 and the line I8|, into the pump |88, from
10 which it is expelled through the line | 82, into
the chamber between the injector cylinder |28
and its surrounding casing |23 (Figures 7 and
11). From this chamber the oil ñows through
the pipe |83 and valve |84, into-the chamber
15 between the charging cylinder I 24 and its sur
rounding casing |25. The oil then iiows from
the opposite end of the chamber, through the
lines |85 and |88 into the reservoir |83. Theline |83 is connected to the line |88 by the by
the piston head to the left and with it the die
member 8|. The pressure iiuid also continues
from the line 48, through the line 48 and the
port |3I, into the cylinder I 28, where it acts
against the piston |28 to move the charging
plunger |21 into its retracted position. The fluid
expelled from the opposite sides o! the piston
heads |28 and 88 passes through the lines 41 and
45, the port 43 of the control valve 42, and the
port 54 and line 58, into the tank ||.
18
To place the clamping plunger and dies in en
gagement with one another and with the In
jector. the hand lever 53 is moved to the right
into the position shown in Figure 12. In this
position the pressure iìuid flows from the control 15
valve 42, through the line 45, into the space to
the left of the clamping piston head 88, forcing
the latter inwardly until the die member 8| en
gages the die member II3. When this occurs
20 pass line |81, containing the by-pass valve |98.
the die member |I3 is forced rearwardly until
The oil in the reservoir |83 is'heated by the
heating unit |84 in response to the control of
the thermostat |81. The heated oil, in passing
through the passageway |88 on its way to the
pump |88. surrounds the bulb |88, which is con
nected by the conduit 288 to the thermostat |81
so that the thermostat responds to the temper
ature of the oil surrounding the bulb |88 and
imparts its control to the electrical heating unit
30 |84 through the lines |85 and I 88 leading thereto.
The heated oil reaches the reservoir |83 from an
ante chamber 28|, access to which is obtained
its mouth ||1 comes into engagement with the
nose |22 of the injector. The impact is cushioned
by the gradual yielding of the cushioning piston
heads |82 in the face of the superior thrust o1'
the clamping plunger 81.
While this is occurring pressure ñuid passes
from the line 45, along the line 41 and through the
port |38, into the cylinder |28 (Figure 11) , where
it acts against the piston head |28, forcing it :ln-v
wardly and directing a charge of the molding ma
terial into the injector 'cylinder |28. The parts
have now arrived in the positions shown in Figure
through the filling connection 282 (Figure 7).
1_2, with the two die members 8| and I I3 in engage
The indicating thermostat |81 is mounted in ' ment
with one another and with the injector.
a convenient location upon the front of the press;
To lcause the injector plunger 82 to force the
as shown in Figure 1. Also mounted in similar plastic material into the space beween the molds,
locations are the pressure gauges 283 and 284,
the hand lever 351s now moved to the left until
arranged to indicate the pressure existing in the it
occupies the position shown «in Figure 13.
injecting and clamping circuits, respectively. Under
these conditions pressure iiuid now passes
40 The hand wheels |5 and I8 for controlling the
pumps |2 and |3 and the hand levers 35 and 53 from the injector control valve 2|, through the
line 28 and the port 83, into the space to the
also project from the front apron of the press right
of theinjector piston head 8|, causing the
base, where they may be conveniently manipu
piston head 8 I, the piston rod 88 and the injector
lated by the operator.
plunger 82 to move to the left, forcing a charge
45
Operation
of the plastic material through the passageway
Before operating the press the various plungers I |8 into the recesses | I4 and I|5 in the die mem
are placed in retracted positions by shifting the bers. Meanwhile, the material has been main
control valve hand levers 35 and 53 away from ._ tained in a plastic condition by reason of the cir
culation of the heated oil from the reservoir |83
one another, as shown in Figure 11. The pumps
i2 and I3 are then started by starting the motor
through
through
cylinder
When
i4, and the heating iluid pump I 88 is operated by
starting the motor |88. With the valves 2| and
42 in the positions shown in Figure 11, pressure
iluid ilows from the pump I2, through the line
'the lines previously described, and
the chambers surrounding the charging
|24 and injector cylinder |28.
the molding operation is completed _the
hand levers 35 and 53 are moved away from one
28, into the bore of the valve 2|, thence through - another into the position shown in Figure 11,
whereupon the various plungers are retracted, in
the port 25, the line 21 and the port 84, into the the
manner previously described, and returned _
space to the left of the piston head 8| within
the injection cylinder bore 88, forcing the piston
head 8| to the right and retracting the injector
plunger 82. At the same time iiuid iiows from
the line 28, through the branch line 22, the
check valve 23, the line 22a and the ports |8|,
into the cushioning cylinders |88, where this
65 fluid acts against the piston heads |82 to force
the crosshead 83 and die member II3 to the left.
Meanwhile, the fluid expelled from the oppo
site end of the injection piston cylinder 88 re
turns to the tank II by way of the port 83, the
70 line 28, the-valve _ports 24 and 28 and the line>
V38.
During this time the pump I3 discharges
' pressure iiuid through the line 4|-, into the
_clamping control valve 42, thence through'the
port 44 and the line 48, into the space to the
75 right of the clamping piston head 88, forcing
.
to their original positions. As the die member
8| near's'its retracted position the ends of the
knock-out rod 83 engage the ends of the threaded
stop members 88, bringing the rod- to a halt, while
the die member 8| continues its motion to the
left (Figure 11). This causes the knock-out pin
84 to push the molded article out of the recesses
18 of the die member 8| , expelling the article
and Acausing it to drop into the chute 285 (Fig
ure 3), whence it emerges through the mouth
288 thereofv (Figure 1) and falls into any suit
able container. '
i
’
When the _advance lof tire injector piston rod
88 occurs it moves the collar |82 forwardly and
causes the rack |83 to -bring about a rotation of
the screw conveyor |48, in the manner previ
ously described in connection- with the construc
tion thereof. A measuredl cha'f‘ge of the plastic
45:
2.101.190 ‘
the
II‘I and the
llßintothebore ßlwheuceitisim-Y
invention.
'
Y
,
.
s
-
,
¢
_
Having thus fully described my invention, what _
Iluponthe't’
1'
.
as come within thel scope of the claims andthe
VIclaimasnewanddeslretcsecurebyyLetters
PatentJs:4j
â E È ëi g È. g i
conveyor l“, due to theslippase of the pawl Il_l-
'
.A
-
-
Y
.
. l.Y In combination, movable die means, de- ‘
vices for moving said die means into a closed posi
_
tion, an injector adapted to inject molding ma.
The thermostat l" controls the electrical heat- Y terial into said die means, and mechanism auto
overtheratchet wheel'lil.-
"
`
'
l0 ing unit Iß'to maintaintheoilwithintheifes
ervoir |03 at a
matically responsive to and synchronized with the l0
Y operation of said injector for measuring out and.
distributing measured charges of moldingmate
rial -to said injector.
__ 2. -In combination, movable die means, devices
is pieten closed the` neared on wm _pass through-1_. for‘moying said die means into a closed position, 15 *y
the marinus- chambers and make a complete cir
5 an injector adapted to inject molding material
into said dieA means, and'mecha'nism automat
20 tween the chamber ‘surrounding the charging
cylinder and that surrounding the injection cyl
inder, the by-pass valve Ill 'is partially opened
so that a portion' of the fluid flows through
the by-pass line Ill back to the reservoir |83 .
ically‘responsive to and synchronized with the
operation of said injector for measuring out and
distributing measured charges of molding -‘ma- 20
teria] to said injector, said mechanism being op
erative upon the _retraction stroke only of ‘said
injector.
`
l
,
3. A measuring and charging device for supply
25 without passing through the chamber surround- ing -'material to a machine with a material inject-. 25 ’
ing the charging cylinder Ill. 'I'he by-pass valve ing element comprising a charging chamber, a )
ISI may.be manipulated until the desired tem -charging member therein, a measuringv casing
communicating therewith, a measuring member
perature dißerential is obtained between the var
within said casing adapted when moved to meas
ious chambers.
o
Hitherto in injection or extrusion presses a
single high pressure pump has been employed
ure out and feed a predetermined charge of ma- 30
terial, and means automatically responsive to the
to perform the functions both of clamping and ‘ operation _of ,the material injectingV element of
said machine for actuating said measuring mem
of extrusion or injection,- assisted in some in
stances, by a ñash pressure device or by check
35 valves to trap the high pressure oil in the clamp
ing cylinder while the high pressure pump actu
ated the extrusion- or injection plunger. Where
a second pump was employed it\was merely a large
volume, low pressure pump, serving solely to rap
40 idly traverse the clamping plunger in order to
close the dies.
\
.
’
Y
Y
In the present invention it will be seen that
I have provided'separate high pressure pumps,
. each with its own automatic pressure control, to
I 45 supply pressure i'iuid separately tothe clamping
ber to measure out and feed a predetermined
charge of material to said charging chamber. . 85
4. A measuring and charging device for supply- Y
ing material to a. machine with a material inject-V
ing element comprising a charging chamber. a
charging member therein, a measuring casing, a
screw conveyor member therein adapted when 40
rotated to measure out and feed a predetermined
charge of material, and means responsive to the
motion of the material injecting element of said
machine for rotating said screw Vconveyor to
measure out and feed a predetermined charge of 45
plungers and extrusion or injection plunger. InA material to said charging chamber.
5. A measuring and charging device for sup
this manner it is possible to run the extrusion
or injection pressure at a lower level than the
clamping pressure, and such a feature has been
' 50 found valuable in the practical operation of such
presses. In. this connection. it is apparent that
the die area which the press will handle is di
‘ rectly proportions] to the clamping pressure and
inversely proportional tothe extrusion pressure.
55 It Áis therefore sometimes desirable lto run the
clamping pressure up to the maximum and keep>
the extrusion pressure as low as is practical with
the material being handled.
'
_.
In the present invention the high pressure pump
50 I! is of relatively large capacity and is so con
'
nected in the circuit that it serves the function
`of rapidly traversing the clamping'plunger and'
also the feeding plunger on both their forward
land return strokes, thus serving the purpose. of
55 an additional low pressure booster pump. During
the‘extrusion or injection stroke both the clamp
plying material to a machine with a material in
jecting element comprising a charging'chamber, a
charging member therein, a measuring casing, a 50
screw conveyor member therein adapted when
rotated to measure out and feed a predetermined
charge of- material, a gear on said conveyor, a
rack engaging said gear, and means responsive to
the motion of the material injecting element of 56
said machine for moving said rack to l’operate
said conveyor to measure out and feed a prede
"termined charge of material tosaid charging
chamber.
6. A rmeasuring and charging device for sup- 60>
plying material to a machine with a’material in
jecting element comprising a charging chamber, a
charging member therein, a measuring casing, a
screw conveyor member therein adapted when
rotated to measure out and leed a predetermined . 65 .
charge of material, a gear on said conveyor, a
' ing and feeding plungers are at rest, with their> rack engaging said gear, means responsive to the
pressure being held at these points by the small
high pressure pump I3, and during this forward
70 extrusion stroke the extrusion or injection is car
ried out solely by the large high pressure pump
i3.’ This pump l2 enables the ‘elimination o
ilashpressure devices previously used.
motion of the material Yinjecting element of said
machine for moving said rack to operate said
conveyor to measure out and feed a-predeter- 70(
mined charge of material to said charging cham
ber, and ratchet means disposed between said
v 4 rack and said conveyor and adaptedl to opera-te
It will be understood that I desireto com
75 _prehend withimmy invention fsuch modiñcations.
said conveyor by the motion in one direction only
"creanme,
'
nsl
6
9,107, 190
'1. In combination, a pair of mutually engage
the iiuid from said container through said com
able die members. a molding material injector
partments, means for heating said iluid, means ~
therei'or, hydraulic plungers i'or moving said die
members into engagement with each other and
for by-passing a portion of the duid past one of
said compartments whereby to establish a tem
perature differential between said chambers, ther
. with said injector, a hydraulic plunger for operat
' ing said injector, and measuring means synchro
mostatic means for maintaining a substantially
nized with the motion ot said injector plunger to constant temperature in said fluid container, and
measu?ëf out and supply measured charges oi. _»a valve in said by-passing means for controlling
molding material to `said injector.
10
Y
' ¿ the proportionate quantity of iluid by-passed.
8. An apparatus for treating heated materi
"
Y
ll. An injection molding press circuit compris
10
comprising a machine having a plurality of ma
ing a plurality oi' dies, a,v hydraulic clamping
terial-treating chambers, a fluid container, iiuid plunger for said dies, a molding material injec
compartments adjacent said chambers for ex
tion member, an injection plunger therefor, and
changing heat therewith, means for circulating independent means for separately supplying pres
the ñuid from said container through said com- _ sure ñuid to said clamping plunger and said in
partments, means for heating said iiuid, and jection plunger, said last named means including
means for by-passing a portion of the fluid past mechanism for actuating said clamping die plung~
one of said 'compartments whereby to establish- er at a higher pressure than said injection
a temperature diil’erential between said charn-v
plunger.
20
bers.
v
_
.
-
‘
`
Y
'
12. An injection molding press circuit com
20
9. An apparatus for treating heated materials prising a plurality of dies, a hydraulic clamping
comprising a machine having a plurality of maf `plunger for said dies, a. molding material injec
terial-treating chambers, a ñuid container.' duid ' tion member,L an injection plunger therefor, a
vcompartments adjacent said chambers for ex
variable delivery pump for supplying pressure
25 changing heat therewith, means for circulating iluid to said clamping plunger, means responsive
the fluid from said container through said com
to the attainment cf a predetermined pressure in
partments, means for heating said fluid, means
for by-passing a portion of the 'fluid past one of
said compartments whereby to establish a tem
30 perature diiîerential between said chambers, and
thermostatic means for maintaining a substan
the clamping circuit for shiftingsaid pump to its
neutral delivery position, a second Variable deliv
ery pump for supplying pressure iluid to said in
jection plunger, and means responsive to the at 30
tially constant- temperature, in said iiuid con
tainment of al predetermined pressure i? the in
jection circuit for shifting said second pump to its
temer.
l0. An apparatus for treating heated materials
neutral delivery- position, said last named means
comprising a machine having a plurality of ma
terial-treatingchambers, a iiuid container, fluid
compartments adjacent said chambers for ex
changing heat therewith, means for circulating
_
including mechanism for actuating said clamp
ing die plunger at a higher pressure than said in
jection plunger. '
DISCLAIMER
'
_
_
'
VICTOR S. SHAW.
_
2,107,l90.-Victo'r S. Shaw, Cai'dington, Ohio. PLASTIC EXTRUSION MOLDING
PRESS. Patent dated February l, 1938. Disclaimer ñled February 25,
ì 1939, by the assignee, TherHydrauLíc Press Corporation, Inc.; the patentee
'joining and concurring.
Hereby enters this disclaimer to claims l, 2, and 3 of said Letters Patent.
` {Ojñcial Gazette March 21, 1939.]
6
9,107, 190
'1. In combination, a pair of mutually engage
the iiuid from said container through said com
able die members. a molding material injector
partments, means for heating said iluid, means ~
therei'or, hydraulic plungers i'or moving said die
members into engagement with each other and
for by-passing a portion of the duid past one of
said compartments whereby to establish a tem
perature differential between said chambers, ther
. with said injector, a hydraulic plunger for operat
' ing said injector, and measuring means synchro
mostatic means for maintaining a substantially
nized with the motion ot said injector plunger to constant temperature in said fluid container, and
measu?ëf out and supply measured charges oi. _»a valve in said by-passing means for controlling
molding material to `said injector.
10
Y
' ¿ the proportionate quantity of iluid by-passed.
8. An apparatus for treating heated materi
"
Y
ll. An injection molding press circuit compris
10
comprising a machine having a plurality of ma
ing a plurality oi' dies, a,v hydraulic clamping
terial-treating chambers, a fluid container, iiuid plunger for said dies, a molding material injec
compartments adjacent said chambers for ex
tion member, an injection plunger therefor, and
changing heat therewith, means for circulating independent means for separately supplying pres
the ñuid from said container through said com- _ sure ñuid to said clamping plunger and said in
partments, means for heating said iiuid, and jection plunger, said last named means including
means for by-passing a portion of the fluid past mechanism for actuating said clamping die plung~
one of said 'compartments whereby to establish- er at a higher pressure than said injection
a temperature diil’erential between said charn-v
plunger.
20
bers.
v
_
.
-
‘
`
Y
'
12. An injection molding press circuit com
20
9. An apparatus for treating heated materials prising a plurality of dies, a hydraulic clamping
comprising a machine having a plurality of maf `plunger for said dies, a. molding material injec
terial-treating chambers, a ñuid container.' duid ' tion member,L an injection plunger therefor, a
vcompartments adjacent said chambers for ex
variable delivery pump for supplying pressure
25 changing heat therewith, means for circulating iluid to said clamping plunger, means responsive
the fluid from said container through said com
to the attainment cf a predetermined pressure in
partments, means for heating said fluid, means
for by-passing a portion of the 'fluid past one of
said compartments whereby to establish a tem
30 perature diiîerential between said chambers, and
thermostatic means for maintaining a substan
the clamping circuit for shiftingsaid pump to its
neutral delivery position, a second Variable deliv
ery pump for supplying pressure iluid to said in
jection plunger, and means responsive to the at 30
tially constant- temperature, in said iiuid con
tainment of al predetermined pressure i? the in
jection circuit for shifting said second pump to its
temer.
l0. An apparatus for treating heated materials
neutral delivery- position, said last named means
comprising a machine having a plurality of ma
terial-treatingchambers, a iiuid container, fluid
compartments adjacent said chambers for ex
changing heat therewith, means for circulating
_
including mechanism for actuating said clamp
ing die plunger at a higher pressure than said in
jection plunger. '
DISCLAIMER
'
_
_
'
VICTOR S. SHAW.
_
2,107,l90.-Victo'r S. Shaw, Cai'dington, Ohio. PLASTIC EXTRUSION MOLDING
PRESS. Patent dated February l, 1938. Disclaimer ñled February 25,
ì 1939, by the assignee, TherHydrauLíc Press Corporation, Inc.; the patentee
'joining and concurring.
Hereby enters this disclaimer to claims l, 2, and 3 of said Letters Patent.
` {Ojñcial Gazette March 21, 1939.]
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