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Патент USA US2404559

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July v23, 19460
2,404,559‘ I -
Filed July 26, 194$
A ‘2.6;)
' _
Patented July 23, 1946
Bernard D. Ashbaugh, Mount Gilead, Ohio, as
signor to The Hydraulic Development Corp_.,
_Inc., Wilmington, DeL, ‘a corporation of Dela
‘Application July 2c, 1943, Serial No. 496,170
10 Claims.
(01. 13-30)
tic material that was ejected by» the injection
This invention relates to injection machines,
and particularly to a machine wherein preformed
‘and compressed charges of plastic material can
be produced for delivery into the injection cham
plunger duringa strokeof operation thereof,
Still another object of the invention is to pro
vide a combination pellet or briquette ‘forming
.An object of the invention is to provide a com
bination pellet or briquette forming machine and
and injection machine wherein. the pusheback
pressure for the injection plungeroperates the
pellet forming apparatus so that plastic mate
injecting machine.
rial can 'be delivered into the pellet forming ap- '
ber of the machine.
paratus, andwherein the push-back pressure for
Another object of the invention is to provide
the combination machine in accordance with the 10 the molds of the machine is used for compres
foregoing object wherein the preformed and
sing a charge of plastic materialinto a pellet of
v compressed charges of plastic material arepro
a predetermined size and for feeding the formed
pellet or briquette ‘into the injection» chamberv
duced in such a manner that the quantity. of
material ineach charge of plastic material is
. of the machine.
gauged according to the quantity of material that 15 Further Objects
and advantages will become
apparent from the drawing and the following de
is ejected from the injection cylinder. ‘
Another object of the invention is ‘to provide
Inthe drawing:
a combination machine for forming pellets or
Figure 1 is a diagrammatic illustration,‘ par
briquettes of ?ock material that are subsequently
fed to the injection cylinder of the machine for 20 tially in cross section, of a machine and‘ hy
draulic system incorporating the features of this
use in an injection molding process.
Another object of the invention is to provide
an injection machine that is adapted to oper
ate upon a continuous cycle of operation wherein
v Figure 2 is a view of apportion oflthe apparatus
shown‘ in Figure 1 to illustrate the position ‘of
preformed pellets or briquettes of plastic mate
thebriquette forming . apparatus when plastic
rial are fed into the injection chamber of the
material is being fed thereto.
wherebyvto insure complete ?lling of a mold or
to gradually elevate the temperature of a plu
rality of charges of plastic material as they pass
through the injection cylinder for ejection there
from into a mold.
Figure 3 is a transverse cross sectional view
machine having predetermined quantities of
plastic material in each; of the preformed
charges gauged according to the Volume of ma~
terial ‘ejected from the injection cylinder so that
there will always be a substantially constant
quantityof plastic material remaining in the injection cylinder after each cycle of operation
taken along line 3-3 of Figure 1.
Figure 4 is a diagrammatic illustration of a
modi?ed arrangement of hydraulic system that
can be used in co-operation with the machine il
lustrated in Figure 1.
In this invention the combination briquette
23 CA
forming and injection machine consists of a body
[0 having an internal bore ii that aligns with
the internal bore‘ of an injection cylinder 12, the
injection cylinder l;2 being suitably secured to the‘
body- Ill. The injection cylinder l2 may be heat
ed in any conventional manner to raise the tem; =
Still another object of the invention is to pro 40 perature of plastic material as it passes vthere
' vide a combination pellet or briquette {forming
through in order to plasticize the same and place
injection machine wherein the pellets or bri»
it in condition for ejection througha suitable
quettes‘ are formed in the machine during the .
nozzle B into the mold members 14 ‘and l5 when
period when the injection plunger is on a re
the mold members are in closed position.
traction stroke and the mold associated with the
injection cylinder is opened.
An injection plunger It ,is connected to‘ and
is operated by a double-acting hydraulic‘ motor
Another object of the invention is to provide
11 that has conduits l8 and Him supplying
a combination pellet or briquette forming and
?uid under pressure to opposite ends of the hy
injection machine ‘wherein the operation of the
draulic motor I7 in accordance with the set
briquette forming portion of the machine to reg 50 ting of the‘ 4-way valve 20.
' "
The mold l4 ‘isimoved toward and ‘away from
ulate the size of the briquette formed‘ is con
the mold I5‘by means of ,a ram 21 that extends
trolled by a mechanism actuated in responseto
from a double-actinghydraulic motor 22.‘ Con- '
the movement of the injection- plunger so that
the pellets or briquettes formed in the machine
duits 23 and‘ 24 are-connected. to opposite ends
contain substantially {the same quantity of plas 55 of the ‘hydraulic motor; .22_ .'for- supplying iiuid
- ._
conduit 50‘ will be also supplied through the con
1 under pressure to the motor as controlled by a
3 4-way valve 25.
A pump 39 is connected to a reservoir 26 by
duit 5| to the right-hand end of the piston 45 '
to advance the same in a leftward direction in
a manner hereinafter described.
7 A conduit 52 connects with the conduit 24 that
‘ means'of a’ conduit 21 to draw ?uid from the
1 reservoirand for supplying thegsameito a pres
supplied ?uid to ‘the push-back side of the mold
operating motor‘ 22 whereby pressure'?uid will be
;_ sure line-28 that connects with a: supply line 29
‘ connected to the inlet side of the 4-Way valves ‘
supplied through the conduit 52 to the left-hand
The pump
39 may be any conven- , " end of the cylinder 46 when ?uid under pressure
tional ?uid pump that is adapted to produce "
pressure and which may be regulated "to ‘deter-‘I 10 is supplied to the push-back side of the hydraulic
mine the maximum pressure that will be produced 1 Y . motor 22. A conduit 53 connects with the cyl
inder 49 at a point intermediate between the
grby the pump38 in the supply line 28. One form
i 28 and 25.
.left and right-hand ends of the cylinder and is
uncovered by the piston 45 when the same moves
with a control mechanism 3| that is connected 152 to the right-hand end of the cylinder 46 so that
the push-backpressure admitted into the cylin
with the supply line 28 by means of a conduit 32
der'46 through the conduit 52 will be supplied.
for regulating the operation of the pump 39
through the conduit 53 into the left-hand end of
whereby to control the maximum pressure de
the cylinder 49 for moving the piston 48 in a
livered by the pump 38,’ Such variable delivery
of conventional pump is the‘well-known variable" I?
‘ delivery constant pressure pumpjthatis pi?oyided
constantpressure pumps'are well-known in the. 20 rightward direction in a manner to be hereinafter
art and will not be further‘disclosed.
The 4-way. valve, ‘28 for controlling the’: ?ow . ~ The operation of the apparatus thus 'far' de
1 of ?uid to the hydraulic motor I‘! is connected 4 scribed will be as follows? Referring to Figure '1,_
. to the conduits l8 and |9,'respectively forsup- v and‘ assuming that the rmachine'has been pre
‘ plying ?uid. to these conduits according to the 25 viously dropped a preform or briquette through
the feed opening 48 into the bore I I, the machine
‘ setting ofv the valve. ~ A pressure reducing'valve
is now ready for an injection stroke.
I. 33 is provided inthe conduit I8 whereby the pres
The pump 33 is, of course, in operation and
§ sure in the conduit between the valve 33 and the
ready to supply ?uid under» pressure whenever
‘ hydraulic motor I‘! will be less than-the pressure
one of the 4-way valves 20 and 25 is shifted.‘ ‘ The
1 in the supply conduit 29 that is passed through
4-way valve 25will be ?rst shiftedl'so thatr?uid
A check valve 34vis arranged to
under pressure will be supplied from the‘ conduit’
1 by-pass the pressure reducing valve‘ 33 when ?uid
29 into ‘the conduit 23 thereby closing the 5mold
1' is to flow through the conduit .|8 to the reservoir.
l4 upon‘ the mold 15 and clamping the same in
3 The 4-way valves 25 and 28 are connected to the
reservoir 26 by means of the/conduits 35 and 36 35
/The 4-way valveZ?-is then shifted so that'?uid
‘ to conduct?uid'to the-reservoir from either “end
under. pressure will be supplied from the conduit
» "of the hydraulic motors I‘! and 22 in accordance
29 to the’ conduit I9 thereby causing thelinjec
‘ with the setting of the 4-wayvalves in conven
tion plunger 16 to ,move through an ,advancing
‘1 tional manner aswell-known in theart. '~ ' '
stroke to move the briquette 55 forwardly into
‘The‘apparatus for preforming briquettesiof
‘ plastic material for feeding to the injection cyl-V 1 the cylinder bore ,II and, force plasticv material
V l the valve 28.
closed position.
': .1-
‘ the molds l4 and I5.
.Upon completion of the injection stroke ,of'the
injection plunger IS, the’ 4\-fway_valve_28 Willnbe
shifted to supply ?uid under pressure from’ the
conduit 29 into the conduit E8 to cause retraction
of the injection plunger, IS.’ The ?uid under’
pressure supplied to the push-back" side "of the
hopper 39; The cylindrical bore 31 communi- .'
‘ cates with an opening '40 that in turn communi
cates ‘with the ‘cylindrical/bore || that receives
. the injection plunger 7 l6 whereby a briquette
‘ formedrin the cylindrical bore 31 may be'fed into
into’ the‘ in
been heated thereinkin conventional manner, into
3 feed ‘opening 38 communicating with a material
" jection cylinder I2.
from the injection cylinder} | 2, that has previously
j inder H.’ of the injection machine ‘consists of a
; cylindrical bore 31 that ‘has a'vertically arranged ‘
‘ the cylindricalbore II for
50 hydraulic motor I‘! to retract the injectionlplung- v
er IE will also be supplied ‘through the conduits
A pair of rollers 4| are reversely rotated by »
, means of an electric motor 42, in the direction of
53 and 5| to the right-hand ends .of the'cylin'de'r's ‘
the arrows on the rollers 4|, wherebyv plastic 5 49 and 46 whereby to move-the pistons 48 and 45
in a leftward. direction'JfThe piston148 will bot-t
3 material in the hopper 39 is 'fed downwardly
through the feed opening 38 into the bore 31 55 tom upon the end of theicylinder"49Vinthe'mani
ner illustrated in Figure 2, while *the,piston"45
‘ for ?lling the same. Scrapers 43 are provided
. for the rollers 4| to prevent the plastic material
I from following the rotation of the rollers and
3 for causing the material to advance into the feed
will abut against ‘a stop member 561th'at' is’pro
vided in the left end wall of the :cylinder 46, and '
will be hereinafter described;
" ‘
The electric motor 42 is,'of_coursej'operating
continuously to rotate the rollers 4| so that when
. A plunger or ram 44 reciprocates in the bore 5
t 31 and is provided with a-piston head- 45 that
1 the plunger 44 moves in a leftward direction-the .
1 reciprocates in the cylinder 46. A second plung
plastic material in the hopper 39 will be moved
er or ram 41 spaced from the plunger or ram> 44,
also reciprocates in the bore 37 and has apiston
; head 48 that reciprocates in the cylinder 49.
A conduit 50 vconnects with the conduit‘ I8
whereby pressure ?uid that is applied to the
push-back side of the injection motor I1 is ap- ' "
l plied to theright-hand end. of the piston head 70
; 48 for advancing ‘the piston in a manner to be
hereinafter described. A conduit 5| connects the
‘ right-hand end of the cylinder 49 with the‘ right
1 hand end ‘of the cylinder 46. whereby ‘pressure I
‘ ?uid that is supplied to the cylinder 49 from the
downwardly into the cylinder bore 3‘! as the
plunger 44 retracts in a leftward movement The
plunger 41 carried by the piston 48 will stop in a
position to close the left-hand end of the feed
opening 40 from the cylinder bore "31, the plungers '
44 and 41 thus‘being in the position as illustrated
It will be remembered that all of this'foregoing
operation will be p'erfOrmed'duringthe retrac
tion' stroke ofthe plunger |6.J.i'1.f
"ijyj :;
The reducing valve '33 provides a'p'ressurejre- ‘
duction between the line 29 and the line |8 so
that the pressure. inthe: line I38 will always be’
below, the maximum pump'pressure that stands‘
in the supply line 29' for reasons which will here-v
inafter become apparent.
When the injection plunger I6 begins itsIretrac-'
tion stroke the 4-Way valve 25 is shifted whereby
?uid under pressure is conducted from thesup
ply line 29 to the conduit 24 to be applied upon
the push-back side‘ of the mold operating motor
22 thereby. withdrawing. the mold. l4~fr0m the 10
mold permit ejection of 'the‘article that has.
been castor molded therein. The vpressureiin the
line 22 will also be supplied throughzthe. conduit‘
52 to the left-hand end of the cylinder 4.6,it being J
remembered that at this time the pistons 45 and 15
the rod 51 upon forward movement ofthe inject-é‘ >
tion plunger. A collar 59 is securedto: the rod .51,
as by means of a'set screw,v that is engaged by
the arm 58 when the plunger Iii-strokes in a for- f
ward direction. ‘If the quantity'of‘plasticmate
rial in each of the briquettes that is fed into the
cylinder bore l.l remainsconstant, the 'arm?58 will
just strike the collar 59 but will cause no move
ment of the rod‘ 51. However, such conditions
are not'obtainable in practice because the density
of plastic material» fed into the cylinder bore31
varies somewhat, so'that thellength of. the bri
quette, formed between .theplungers 44 and .41
varies upon each operation of the briquette form-v
the result of the previousapplication, of the push
back pressure from the injection. motor I1 being
supplied to the right-hand ends of. these pistons
The opposite end of therod'51 carries a piston 7. ;
48 will be in a position illustratedin Figure 2'. as
60 that operates in a» cylinder 6| that communi
cates with the push-back pressure line 24' of-the
mold operating motor 22 by means of the ‘conduit
20 52 whereby'the 1piston 65 Will be moved into the
outward'position against a stop 63 that is engaged
With the push-back‘ pressure from the mold
by the collar 64 when push-back pressure stand
operating hydraulic motor 22 being supplied to
in the line 24.
_ the left-hand‘end of the piston 45’, the‘ piston
The rod 51 is also provided with another'collar
will move‘in'a rightward direction to compress
the plastic material that will be retained between 25 55 associated with the collar 64 that receives a
aspreviously described.
the ends of the plungers 44 and .41. i The com
yoke 66 therebetween that is on one end of-a bell
crank lever 61 pivoted by means of a pin 68. The
pression of the plastic material.‘ willrcontinuev
opposite end of the bell crank lever receives one
until the pressure on the plastic material: is su'fli
end of anarm 69 pivoted thereto by means of a
cient to overcome the push-back pressure ‘in the‘
right-hand end of the" cylinder 49,v it; being. re‘ 30 pin 10, the opposite end of the arm 69 being piv
oted to a stroke control-member 11 by means of
membered that the pressure reducing valve 33.
maintains the pressure in the push-back line.l8
below pump pressure that is 'being?supplied'
The stroke control member 1| is provided with
through the conduit 52. The compressed charge‘ >7 an angularly inclined surface 13 that ‘engages a
of plastic material between the ends of theplung
‘similarly inclined surface 14 provided on a sup
ers 44 and 41 will be moved in a rightward direc
port member 15;'suitabl'e guide tracks 16’ being
tion under this compression until the piston 45
provided‘ between the support 15 and the control
uncovers the conduit 53 to permit the push-back
member 1! to guide the same in sliding movement.
pressure in the conduit .52 and cylinder. 46 to
The stroke control member is provided with aver
enter the conduit 53 and thereby supply vthe same 40 tical face 11 that is engaged by a roller 19pm
pressure to the left-hand end of the piston 48.
vided on the end of the stop member 565.1 By reg-l
ulating the position of the stop ‘member 56 it will
When this occurs, both plungers 44 and 41 will
move in a rightward direction at the same speed
be apparent‘ that the rearward position of the
so that the briquette of plastic ‘material that has
plunger 44 can be controlled to vary the space be;
been formed between the plungers will be 45 tween the plungers 44 and 41 and thus regulate‘
brought into alignment with the‘ feed opening 40
the quantity of plastic material fed between these
and will thereby drop throughthefeed opening
members and compressed into a briquette'.
49 upon the top of the injection plunger l 6 if the
As previously‘mentioned, if the arm 58' does not‘
injection plunger has not completed its retraction
cause movement of the collar 59 there will be no
stroke. As soon as the injection: plunger com 50 operation of the stroke control apparatus. » How
pletes its retraction stroke, whereby’lthe plunger
ever,‘ when‘ the‘ arm 58 strikes the collar 59 toward
will be in the position as illustrated in Figure 1,
the end‘ of the injection stroke and‘ moves the
the briquette 55 will dropinto the cylinder bore“
same in a leftward‘ direction, thereby moving the
and thus the. machine will be ready for another
rod 51, the bell crank lever 61 will be rotated-‘in
cycle of operation.»
- ~
Y .
55 a clockwise direction to move‘ the stroke control
The stop member 56 is a part of a mechanism
member 1| upwardly along the inclined surface
for regulating the rearward position of the piston
14 and thereby permit movement of the stop
45 whereby to control the quantity of plastic ma
member 56 when the piston 45 strikes the same
terial that is disposed, between the plungers 44
upon a‘ return movement thereof and thus in
and 41 when they are in the position, as illus 60 crease the space between the plungers 44 and 41v
trated in Figure 2, the mechanism‘ associated with
to increase the quantity of plastic material fed
the stop 56 being provided‘ to regulate‘ the size of
between the same and thereby form a larger. bri
the briquette in accordance with the quantity of
quette on this particular stroke of operation “of .
plastic material that is ejected from the injection
When the push-back pressure. is applied'to' the
cylinder I2 upon each stroke of operation of the‘ 65
injection plunger I6 so that there will‘ always be
motor 22 through the conduit 24, the samepres
a predetermined quantity of plastic material re
sure will be applied within the cylinder 61 to‘ move
maining in the injection cylinder I2 after each
the piston 60 in a rightward direction until the‘
collar 64 strikes the stop 63 and‘rthereby reposi~
stroke of operation of the injection plunger,'vari-v
ations within a practical limit,eof- course, being’ 70 tion the collar 59 on the rod 51 to' its initial start
rI-‘he stroke control mechanism for the plunger
44 consists of a rod 51 that has one end thereof
The location of the collar 59 on the'rod 51 is
governed wholly by the quantity of'plasticl mate‘
rial that is’ required to ?ll the mold'tcavities' so
the injection plunger?‘ I6, the: arm 58 sliding over‘ 75 thatit the‘ iquantityaequired to -?l1'1the‘m1old cav-v
extending through an arm 58v that is secured to‘
vthe 'positioniof'i-the collar on 'thelrodgil'rwillbe
1 changed vso.:that the initial startingtposition of_the
independent ?uid motor means for operating said
‘ Whilerthe. principal- description
pairioi ‘plunger means in said briq'uette forming
apparatus to produce a briquette therein; means
hydraulicallyfconnecting’ the push-backside of
said-.?uidimot'or of said injection apparatus with
‘ collar 59, Willthus varylaccording tothe? quantity
3 of plasticsmaterialéthatjis to be forced into‘ the
injection, rapparatus through 1 the said; opening;
3 ities: should. bexless ine some/instances 'th‘an'zother's
I beeni-Iinv l
oneside'of-eachiof the pair of independent motor
means; for, joperating “said independent‘ motor
' j connection. with ,the *use 1.01“ a single pump and
1 the useof af'pressure. reducing valveeto establish
means together to "position said plunger means
1 a ‘pressure differential between the push-back 10.v for "receiving plastic material therebetween, ‘and
‘ j pressure applied to the injection ihydrauliclmoé ‘
means: hydraulically connecting, the oppositeiside
‘ tor. 22, yet. thisis'inotzthezonly hydraulic-system
of'feachirof‘said: independent ?uid motors, with _
‘ that-man.producethis ‘operation. ,In-Figure 4 ‘I
‘ thereiisillustrlated a-vmoidi?ed hydraulicsystem 1
~ for producing this operation whereinxtwopumps
the‘push-b‘ack side‘of said-mold operating ?uid
motor to actuatethe'sam'e for compressing plastic
1,9 ,andg?ll'are'provided, '
- materialzbetween: said‘plunger means.
‘ 2.:A molding machine that includes in combi
I {The . pump , 80v supplies 7‘ ?uid under pressure ;
nation, an injection~molding apparatus including
through the conduit. 8| ;to-the v4-way. valve 120' for
supply to the conduits, l8, and I9 vwhilethe pump
into the mold,‘ ?uid motorv means, for operating
a moldand injection means for forcing'mate'rial
‘HIV supplies fluid :under- pressure‘through theecon— -‘
1 dint-82 to the sway-valve 25 for supplying ?uid
under pressure through'the conduits vl3 and .24.
Both pumps 19 and 80 may receive their supply
of ?uid from the reservoir 83- through the con
80 is "
y control
." mech~
I ‘ anism 85 connected tothe-pressure conduitu8l
said injection means to force 'plastic material
from the injection apparatus into the mold'ia'sso
ciated therewith, ?uidimotor means for opening
and closing the mold,’ a ?uid power circuit oper
atively connected to both of said'motor means
a for operating the same through an: advancing
stroke and apush-back stroke, a briquette form
ing apparatus constructed'as an integral part of
saidinjection' apparatus consisting of a briquet
ting _c'ylinder.- having an opening. therein com
by means of a conduit v86 awhile theipump'19 ‘is
provided with anontrol mechanism 81 thatiscgn- '
‘ nected. to the pressure’ line 82 by means of the ' municating with said injection apparatus through
‘ conduit 88, vThe control mechanisms 85 ands‘! .‘ which lbrique'ttes are fed. thereto and having a,
j for the pumps Y80 and 19, respectively, may be‘ set
jto operate'these ‘pumps atidifferent pressures
pair-of plunger means ‘therein operable in op-'
‘ whereby thepump 19 supplying‘?uidqunderpres
formed therein into 'the injection apparatus
sure to the mold: operating-‘motor 22 can operate
, at a higher pressure than the pumpiBU that sup
position to one another which feed briquettes
through the said Opening; independent ?uid,
‘motor means for operating said pair of plunger
plies ?uid under pressure to the injection plunger
means ‘in said briquette forming " apparatus to
‘ operating motor H. ,The pumps, 19' and 80 may
produce abriquette therein, means‘hydraulically
be, of course,'0f.the,variab1e delivery (constant
‘ pressure
When the
of "pump.system
».in Figure
‘4 is used in conjunction with themachine here
‘toforel described theoperation :of the machine
and system is the sameqas heretofore referred
While the apparatus hereinbefore disclosed and
‘described, constitutes a preferred form of .the in
vention,’ yet, it: is to, be understood that various
imechanical operations may be incorporated in
the apparatus without departing from: the ‘spirit
,of the invention, and that all such‘ modi?cations
as fall within the scope of thepappended claims
connecting the push-back side of said ?uid motor
40 of said injection apparatus with one side of each
of the pair of independent motor meansifor oper
ating said independent motor means together to
' position said‘ plunger means for receiving plastic
material therebetweenpand means hydraulically
'- connecting the opposite side of each of said in
dependent'?uid motors'with the push-back side
of said‘ mold operating ?uid motor to actuate the
same for compressing plastic material between
said plunger: means and for feeding the com
;pressed“ briquette formed between the plungerv
means into the injectionlapp‘aratus during agon
tinuous stroke of'iioperati‘on of said ‘independent
?uid ‘motor means as caused by the pressure ap
fully described
herein. .;.my,
plied‘thereon vfrom the push-back side of said
‘what Iiclaim as'new and desire to secure by 61-314 mold operating motor.
‘Letters Patent is:
1. A molding machine that includes in vcombi
fnation, an injection moldingapparatus including
3; ‘A molding machine that includes in ‘combi
nation, an injection molding apparatus including
jsaid injection means ,to force plastic material
a mold and injection means for forcing material
into the mold,’ ?uid’ motor means for operating
said‘ injection means to force plastic/material
from‘ the injection apparatus into the mold as
;from the injection apparatus'into the‘mold as
sociated therewith, ?uidmotor means for open
a'mold and injection means for forcing ‘material
into the mold, ?uid motor ‘means for operating
ingand ‘closing the mold, a ?uid power circuit
operativelyv connected to both of said motor
' operatively connected to" both of said motor 65, means for operating the same through an ad
‘means for operating the same, through an ad
vancing stroke and a push-back stroke, a
Ivancing stroke and; a, push-back stroke, a
briquette forming apparatus constructed as an ,
lbriquette forming apparatus constructed asan
integral part of said'injection ‘apparatus consist
‘integral part of said injection apparatus con
ing of, a briquetting cylinder having an opening
'sisting of a ‘briquetting cylinder having an open 70. therein communicatin'gfwith'said injection ape
;ing therein communicating with saidjinjection
paratus through which briquettes are fed’there
, sociated therewith, ?uid motor means for open
ing and closing the mold,v a ?uid power circuit
apparatus through: which briquettes are; fed
thereto andhavingra- pair of plunger means ‘
thereinv-operable Lin, oppositionto one -' another
\ to and having a pair of plunger means‘therein
operable in opposition to'one another which feed
briquettes formed therein into the. injection ap
which jfeed; "briquettes, formed therein into the, '75. paratus throughv the, saidv opening, independent
ing with said injection apparatus through which ‘
?uid motor means for operating said pair of
plunger means in said briquette forming appa
briquettes are fed thereto and having a pair of
plunger means therein operablein opposition to
one another which feed briquettes formed therein
ratus to produce a briquette therein, means hy
draulically connecting the push-back side of said
into the injection apparatus, independent ?uid
fluid motor of said injection apparatus with one
side of ‘each of the pair of independent motor
means for operating said independent motor
means together to position said plunger means
motor means for operating said opposed plunger
means in said briquette forming apparatus .for
forming briquettes therein, ?uid conducting
means for supplying ?uid under pressure applied
'for receiving plastic material therebetween,
means hydraulically connecting the opposite side 10 to the push-back side of said injectionin'io‘tor
means concomitantly to both’ of said independent
of each of said independent ?uid motors with the
push-back side of said mold operating ?uid motor
motor means on one side thereof to operate the
to actuate the same for compressing plastic ma
same and position said plunger means‘ in spaced
terial between said’ plunger means, ‘and a stroke
control mechanism for regulating the stroke of
one of said independent motor means intercon
between, and ?uid conductingmeans ‘for supply
ing ?uid under pressure applied Yto‘the push
nect‘ed with said injection apparatus for oper
ation thereby to regulate the‘ stroke of ‘the said
back side of said mold operating motor to said
independent motor means sequentially to operate
relationship tolreceive molding material there-v
independent motor means in accordance with the
said’ independent motor means to‘?rst compress
quantity of'plastic material ejected \from the
molding material therebetween and then feed the ‘
compressed material into the injection appara
injection apparatus.
4. A molding’ machine including in combina
tion, an injection apparatus for ejecting plastic
6. YA molding machine including ‘in combina
tion, an injection apparatus for rejecting plastic
material including a mold and an injection means
for forcing material into the mold, ?uid'motor
material including a mold and an injection means
for forcingmaterial into the mold’, ?uid motor
means for operating said injection means, ?uid
motor ‘means for opening and closing said mold,
'a ?uid power circuit for supplying ?uid under
means for operating said injection apparatus,
pressure to both of said motor means to, operate
mold, a ?uid power circuit forsupplying'?uid
?uid motor means for openingand closing said
the same through an advancing stroke and a 30 under pressure to both of said motor means to
push-back stroke and including means for main
operate the same through an advancing stroke
taining the‘ push-back pressure- on the ‘motor
and a push-back stroke and. including means for
maintaining .the push-back‘ pressure on the motor
m'eans‘for operating the injection apparatus lower
than the push-back pressure onj'the'mold operat
means jfor operating [the I injectioniapparatus
ing motor means, .a briquette; forming apparatus
lower ‘than the push-back pressure on the mold
operating motor means, a‘ briquette forming ap
constructed asan integral‘ part of said‘ injection
apparatus consisting l of_ a briquetting?cylinder '
paratus'constructed as an integral part ofv said
having an; opening therein communicating with
said injection apparatus through which briquettes
"injection apparatus consisting of a briquetting
arefed ‘thereto and having a pair ‘or-‘plunger
cylinder having an opening therein communicat
ing with said injection ‘apparatus through which
means therein operable in opposition to one an
briquettes are fed thereto and having a pair'of
other which feed, briquettes‘ formed therein into
plunger means therein operable in opposition to
one another which feed briquettes formed therein
the injection apparatus through the said opening,
?uid motor means for operating said plunger
means of said briquette forming apparatus‘, v?uid
conducting means for, conducting ,?uid pressure
into the injection apparatus, through the said
opening, independent ?uid vmotor means ;fo,r;op—
applied to the push-back side of said ‘motor‘for
operating said injection apparatus to said ‘last
briquette forming apparatus for vforming
briquettes therein, ?uid’ conducting means‘ for
supplying '?uid under pressure applied to the
push-back side of said injectionjmotor means
concomitantly to both of said independent motor
meansron one side thereof to operate'the same
and» position said plunger, meansv injspaced rela
tionship to, receive molding material therebe
tween, ?uid conduct'ing' means forsupplying‘?uid
mentioned fluid motor means to position the
briquette forming apparatus in position to receive
a charge of material, and ?uid conducting means
for conducting ?uidfunder pressure applied to
the push-back side of said mold operating motor
to the ?uid motor means for operating said
briquette forming apparatusiwhereby to overcome 755
the ?uid pressure applied to said motor means
from the push-back side of said injection motor
and cause forming of a briquette.
crating said opposed plunger means in said
under pressure applied to the push-back side of
said mold operating motor to said independent
motor means sequentially to operate said inde
pendent motor means to ?rst compress molding
5. A molding machine including in combina
tion, an injection apparatus forejecting plastic 60 material therebetween and then feed the com
pressed material into the injection apparatus,
material including a mold and an injection means
and a mechanism for controlling the stroke of one
for forcing material into the mold, ?uid motor
of said independent motor means connected with
means for operating said injection means, ?uid
and operated by said injection apparatus to con
motor means for opening and closing said mold,
a ?uid power circuit for supplying ?uid under 65 trol the stroke of the said motor means in ac
cordance with‘ the stroke of the injection means '
pressure to both of said motor means to operate
the same through an advancing stroke and a
‘and thereby regulate the quantity of molding
material fed between said briquette forming
push-back stroke and including means for main
plunger means upon each stroke of operation of
taining the push-back pressure on the motor
means for operating the injection apparatus 70 the injection apparatus.
7. A molding machine including in combina
lower than the push-back pressure on the mold
tion, an injection apparatus for ejecting, plastic
operating motor means, a briquette forming ap
material into amold including an injection cham
paratus constructed as an integral part of said
ber in which plastic material is heated andv a
injection apparatus consisting of a briquetting
cylinder having an opening therein communicat 75 materialmwreceiving chamber in which fresh 7
7 ‘receiving chamber and said. injection ‘ ,chambe
1' charges ofplastic material are receivedian ‘in; ‘
vmeans forming a' briquetting ,chamberjinwwhich
briquettes are formed ‘under pressure completely
I 'jection plunger for vtransferring plastic material
from'the material‘ receiving chamberto" the in
jectioni chamber and ejecting plastic material
independent of said injection'chamber andma- '
vterial ‘receiving chamberfand ‘disposed adjacent
said material receiving chamber and said'injec
from] the; injection chamber, ' means 7 forming > a
briquetting chamber in vwhich briquettes are
.formed under pressure completely independent of
said injection‘ chamber and material receiving
f chamber and disposed adjacent said material re
ceiving chamben' passage means between said
'briquetting'. chamber and said material receiving
"chamber through which briquettes are trans
ferred from the briquetting chamber to the ma
tion chamber, a pair of opposed plungers means ,
reciprocable in said briquettingichamber, passage
.means ‘between said briquetting chamber and
said material; receiving chamber through which
briquettes are transferred, a supply‘chamberdis
posed adjacent saidgbriquetting- chamber and
communicating therewith,’ andl means for recip-l
rocatingzsaid briquetting plungers/in said; bri
~ terial receiving chamber, and opposed plunger
- means operablytraversing said briquettingcham
quetting chamber to position them in spaced rela
her for briquetting plastic material therein and
.tionship'» beneath. saidg supply, chamber whereby
Itransferring the same to said passage means;
- "8: Amolding machine including in combina
' to, receive plastic material therebetween from said ,
supply: ‘7 chamber; _ to apply. ‘pressure ,1 on the .said
:tion,;an injection apparatus for ejecting'vpla‘stic
material between-said plungers and transfer the
zmaterialrinto a mold including'an injection cham 20 compressed material: to saidipassage (means for
berin- which plastic material is heated and _a ma- >
transfer into said material receiving chamben; ' ~~
terial receiving chamber in which fresh charges
1 of .plastic'material are received, a-mold associ
Y '10. A molding machine'including in combina
tion; an- injection apparatusifor ejecting plastic
‘ated; withsaid injection chamber. and including
material into a‘mold including anjinjectioncham
her in ‘which plastic material isheated for'ejec
a fluid motor [for operating said'jmoldc an‘ injec
' ltion-rplungerjfor transferring plasticmjaterial
tion therefrom‘and a material receiving cham
from ;.the- material receiving chamber to the in-V ' ber to receive fresh charges of _plfastic,_material,
an injection (plunger reciprocable in said ma
;je_ctioné chamber and ‘ ejecting plastic- »material
-f-rom1 the-injection chamber, ?uid‘motor "means
v.for operating said injection plunger, meansform
ing" a briquetting chamber disposed’ adjacent said
terialreceiving chamber and said injection cham
30 ber, means’ forming a .briquettinggchamber ,in
which briquettes are :formed under pressure com
wmaterialreceivingchamber passagefmeahslber V '
‘ tween .said ibriqliétting 'chambercan'd ls'aid mate
rial‘. receiving Ichamber through i which" briquettes
rareqtransferred from ‘the briquetting cli'amberrito
the material receiving ‘chamberQ?uid motor vmeans
' for operating,‘ ‘said .briquetting plunger, vmeans,v
.means, hydraulically . connecting the. ,briqu'ettin'g
.pletely independent of said injection chamberand
'r’naterial receiving chamber ,andfdispo'sed. adja- .
centv said material receiving 1 chamber and said '
injection. chamber, a :pair of " opposed.’ plungers
means bothreciprocablein.said briquettin'gcham
.ber; ,yypassage means .7 between; ., said i ibriquetting
' chamberlgand. said .mat‘eriagl .receiving'ilc'hamber
plunger ‘motor means,’ with‘ the push ‘back sidejof
through which briquettes are tr‘arisferredéav sup
thelinjection; plunger motor means to operatelthe .40 ..ply :chaimber disposed. adjacent said vbriq'uetting V
;briquetting'plunger ,to?receive a charge of plastic ,_ chamber and communicating therewith, ‘means
7' material concomitant with'retraction of ,said in
jection'plunger; and 1 means hydraulically con
reciprocating both of ' said briquetting vplung
ers in said briquetting chamber to, position them
.necting'saidabriquetting ‘plunger, motor means
inrspacedrrelationship beneath said supply cham
with ~the push .back ‘side of said mold: operating 145 ber to compress material therebetween and trans¢ 7 motor 'to produceua briquetting operationbysaid
fer the compressed material to said passage means
,bl‘iquettingnplunger_'concomitant with opening
A melding ‘machine mowing in bah-mag
for .Vtransfer" into said material receiving cham
ber, and means. actuated by~movement of said
injection plunger for-regulating the'position of
' ti'on,Van'injectionv apparatus for ejecting plastic .50 onewof said Vbriquetting plungers to cohtrolgthe ,
material into ‘a‘mold including an injectionch'am
her in which plastic material is heated for ejecL
tiongtherefrom anda material receiving chamber
stroke thereof and determine-J the spaced rela
' tionship between said briquetting plungers to con
.trol'the size of the briquette formed therebetween.
toreceive fresh charges, of plastic material, an ’
' injection-plunger reciprocable; in said'material .55 ’
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