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Патент USA US2408912

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" Oct. s, 1946.
A. A. BURRY
‘ 2,408,911
PLASTIC MOLDING MACHINE
Filed Nov. 11', 1943
5 Sheets-Sheet l
‘D
0
Infeh I01:
Oct. 8, 1946.
A. A. BURRY
2,408,91 1
‘PLASTIC MOLDING MACHINE _
Filed Nov. 11, 1943
SYSheetS-Sheet 2
0ct..8, 1946.
A. A. BURRY
2,408,911
PLASTIC MOLDING MACHINE
Filed Nov. 11, 1943
5 Sheets-Sheet 3
26
4
14A
16’24
i5
J6 J6
\
W
.22
/
£75"
cf» 3, 1943
A. A. BURRY
_
2,408,911
PLASTIC MOLDING MACHINE
Filed Nov. 11, 194:
1
5 Sheets-Sheet 4
1
_
Inr/én for.
i?-
16
.
.
/
1%‘
0a. s, 1946.
I
A. A. BURRY
PLASTIC MOLDING MACHINE
2,408,911
2,408,911
Patented Oct. 8, 1946
UNITED STATES PATENT ‘OFFICE 1
2,408,911
PLASTIC MOLDING MACHINE
Arthur A. Burry, Toronto, Ontario, Canada, as
signor to Cyril Fuller
Application November 11, 1943, Serial No. 509,936
'
5 Claims.
(01. 18-16)
1
section taken on the line 4-—4 of Figure 3 or the
This invention relates to machines for moldiner
articles from plastic materials under extremely
heavy hydraulic pressure and the principal ob
toggle operating mechanism.
_
Figure 5 is a horizontal sectional view of the
abutment end of the machine taken on the line
5—5 of Figure 3.
Figure 6 is an enlarged longitudinal sectional
jects of the invention are to provide a machine
in which the faces of the molding die blocks will
be held in contact during the molding operation
under hydraulic pressure, overbalancing the
view of the injection plunger cylinder and heater
taken on the line 6-6 of Figure 1.
The machine herein shown and described com
that the articles produced will be perfectly
formed and free from ?ns caused by leakage of 10 prises a base I having a horizontal bed plate 2 at
one end thereof on which is rigidly mounted an
the plastic between the mold faces.
abutment 3 through which extends a pair of hor
A further important object is to devise a mech
izontal tie rods 4, the inner ends» of which are
anism in which the dies will be separated instan
anchored in a ?ange 5 extending transversely of
taneously following the completion of the injec
tion operation so that the molded articles may be 15 the base intermediate of its length.
A pair of horizontal tie rods 6 arranged above
cleared from the dies with great rapidity and be
the rods 4 and parallel therewith are secured at
fore the material has become chilled.
pressure of the plastic injection mechanism so
A still further object is to devise a machine in
which the stresses are uniformly distributed be
tween the several moving elements, thereby re
one end in the abutment 3 and the inner ends
extend through a die block holder ‘I whichv is
20 slidably mounted on the tie rods 4 adjacent to the
flange 5.
lieving excess stresses at any particular point in
A die block holder 8 is slidably mounted on the ,
the structure.
tie rods 4 and 6 between the member 1 and the
One of the principal features of the invention
abutment 3. The holder 8 is formed with a cen
consists in the novel construction and arrange
ment of a locking toggle between a movable die 25 trally arranged lug projection 9 which is provided
with a transverse horizontal slot ID in which is
holder and a ?xed abutment whereby the die
holder may be operated to close the die carried ' mounted a hardened steel block II which has an
thereby against the opposing die and to be moved
upwardly bevelled curved face I2 terminating in
a bottom lip l3.
.
away from same with a rapid reciprocating move
ment free from endwise pressure, a hydraulically 30 The abutment 3 is formed with a cylindrical
ori?ce l4 having an annular shoulder l5 at the
operated member being interposed between the
inner end, and threaded into the outer end of said
said toggle and the ?xed abutment to apply a
ori?ce is a ?anged block 16.
?nal closing pressure between the dies.
Slidably mounted in the cylinder ori?ce I4 is a l
A further feature of importance consists in the
novel construction and arrangement of hydraulic ' piston block H which has a reduced end extend
ing beyond the shoulder l5 and spiral compres
means for breaking the toggle and moving the
sion springs l8 housed in recesses in the piston
dies apart and for returning the movable die
engage the shoulder and urge the piston inwardly
holder and toggle into closed position.
toward the end block IS.
A still further feature of importance consists
in the ?exible coupling of the stationary die 40 The inner end of the piston I‘! is spaced from
the inner end of the block I B and both the piston
holder with the cylinder of the injection ram
and block are provided with ?anged washers l-9
whereby hydraulic pressure is applied to pull the
cylinder into operative contact with the station
ary die in opposition to the pressure exerted by 45
the injection plunger.
‘
In the accompanying drawings:
Figure 1 is a plan view of my improved molding
machine.
held in position by centre plates 20 secured by
suitable countersunk screws.
A port 2| extends through the base of the
abutment 3 midway between the inner ends of
the piston I1 and block l6 and is connected to a
suitable valve-controlled source of hydraulic pres
sure supply.
Figure ,2 is a side elevational view of the ma
The piston‘ block I‘! is formed with a part-cy
50
chine.
lindrical recess .22 in the end projecting from the
Figure 3 is an enlarged vertical longitudinal
cylindrical ori?ce and in this recess is secured
mid-sectional view of the abutment end of the
machine and the movable die holder and toggle
mechanism taken on the line 3-3 of Figure 1.
Figure 4’ is a part vertical elevation and half
by transverse bolts 23 a cylindrical member 24
which is provided with reduced trunnion ends 25.
Rotatably mounted on~the...trunn.ion ends 25
2,408,911
3
4
are a pair of side plates 26 which are formed
ticles out of the die.
with outwardly extending bearing trunnions 27
arranged intermediate of their length.
release position by coil compression springs 43.
The ends of the bar 42 project beyond the block
8, as illustrated particularly in Figure 5, and are
adapted to engage the ends of rod members 44
A plate 28, preferably of hardened steel, is se
cured between the side plates 26 with one end
snugly abutting the cylindrical member 24 se
cured to the piston, and the other end thereof
threaded in lugs 45 extending from the abut
ment 3.
is curved to correspond to the curvature of the
face I 2 of the block I I, said curvature,being1prefe
The threaded rods 44 may be adjusted to any
desired position v.so that-the free ends, thereof
wilt. engagegthe;j‘knock-outt?bar 42 as; the block
8 is moved by the upward operation of the toggle,
and by the manipulation of a suitable valve
mechanism, which may be controlled by the
erably theuarc of a circle, the centreof which ,is .,
located above the axial centre of the member 24
on which the side plates swing so that the plate;
28 will swing up and clear the curyedwface of
the block I I.
Mounted on the'trunnions v2'I are .apai‘niof
upward-swinging of the plate 28 or the longitudi
nalinovement of the die block holder 8, ?uid
ppressure'to the cylinder 35 may be reversed, that
is to say, the port 39 leading to the bottom of
thecylinder will be-connected to exhaust and the
port. 40~will be connected to the pressure side
of a suitable hydraulic ?uid supply.
links 29 which extend, alongside the plate_s_,;;28.gg
and are pivotally connectedto trunnion ,exten- _
sions 30 on the sides of the lug'~9-of the die‘bl'ock
holder 8.
The link members 29 pivotally mounted on the
sidelplatesjli form‘ a toggle ,connecting the pis
ton Il'with the movable die. block slidably'mount
ed Q11 thelongitudinal tiebars? and 6. "
Fluid thusv enterstheltop of the cylinder and
forcesthe piston 34‘ downwardly, thereby swing
ing the' plate 28; and through the toggle, return
‘
The ,plate28mounted on and‘swinging with
the‘ side plates of the toggle'when‘in its lowered
positipnlgas‘illustrated in Figure 3; forms a lock
or‘ rigid istrut between the piston and the block 8.
The plate 28"‘haswsegcuredhto its'underside a
bracket, 3I.__which' is‘ formed with'a downward
extending jawhandgbetweenrthe side lugs (32 of
the jaw is -_pivo_tally fmounteda plunger rod 33."
The bar 42 is held in the
25
ing the die-holding block 8 to its original posi
tion," the’ plate 28 ‘having its arc-shaped face
brought into- snug’ engaging contact with the
curved‘face I 2- of the block II.
This movement of the block 8 brings the die
faces-into close engagement and through the
manipulation of —a suitable control switch 45'
pivotally mounted intermediate of its length on
hollowedv gudgeons ‘36~suppo_rted in brackets 31
‘engaged by, the plate 28; or any other part of
the toggle mechanism; the valve controlling the
inlet of hydraulic-pressure ?uid to the port 2I
is‘ open,-~and the pressure ?uid ?owing in be
tween‘ the block- IBand piston ll applies endwise
pressureto the piston which is transmitted along
secured to- the underside of the bed plate 2 either
thelhorizontalcentre line through the block 24,
A piston. 34 is" mounted on the rod .33‘ and op
erateswithina cylinder '35 arranged in substan
tially?right angular relationto the'plate 28,-and
the plate 28 and the block, II to the block 8 car
ryingthedie, thus applying hydraulic pressure to
withl'a port 33:1eadingto the bottom end of the 40 force the‘ contact faces of the dies together with
a pressure that willprevent leakage of the plas
cylinder ‘35,"and the ‘other of said gudgeons is
tic .materialwhich will then be forcedv into the
connected to a port 40 leading to the top of the
die.
cylinder. j Suitable'lt'ubular- connections are pro
The die-holding ‘block '1, which is mounted on
vided with/‘each of they gudgeons to conduct hy
draulic' pressure respectively-to the bottom and ‘ the. lowergtie ‘rod 4, engages the flange 5 to resist
side of a3s1ot_38. ;
Oneor the hollow‘ gudgeons 36 is connected
top-of; thecylinder and to provide alternately for
the exhaust of pressurefluid. ‘
It‘will be understood, that by the application
of ?uid-‘pressure within the cylinder 35? against
the bottom end of the piston 34, the piston and
plunger-rod 33 are forced upwardly; the pressure
?uidiexhaustingthrough the port 40'.
The upwardr’movement; of the rod‘ 33' lifts the
plate‘ 28 swinging it on ‘its; trunnion bearing
supports on the'gends of themember 24. i ' '
It will be understoodthat there is ‘no binding
pressure between the face I2 of the block II
and the'plate 28>duevto>the pressure of the springs
I 8‘ against! the piston, forcing» it inwardly toward
the end block I6, there being-~no-_?uid pressure
between the said block I6 and piston. '
‘
As the vplate 28 is swung upwardly through the
raising-of the piston 34 the side links 28 exert
a longitudinal pullupon the trunnions of they
the'Iendwise pressure exerted thereagainst by the
hydraulic ?uidwdirected against the piston I1.
Theiupper side of the block 11 also engages the
limitinginutof-the upper tie rods 6.
ThehaseLI is provided with'a bed plate 48 on
which?'s. mounted, for limited endwise displace
merit, a frame 4.‘! which has longitudinally spaced
vertioal?angesnn and 49... A cylinder 50 is se
cured to the .outward. face of the ?ange 48 and
operatingin said. cylinder. is a piston 5|, the
plunger..52.-of which .extends through a suitable
packing .boxin the ?ange 48.
A ram-i 53.:is. secured in_the.end of the plunger‘
and extends through‘ an ori?ce in the ?ange 49
andslidablyengages .a tubular liner 54 mounted
'ina cylindrical?anged spacing member 55 se
curedi tdthe. flange .49..
A chute i?gextending. ,-_from ‘a suitable hopper‘
containingethe, powdered plastic material, enters‘.
,‘ltheggspacer;and;_;liner;intermediate/poi its length .
‘and feeds the material into thellinenin frontof thereby-pulling the die momma-ma by the block- I ‘ the ram 53.
block 8, thereby sliding the block, and the die
block carried thereby} toward: the abutment,_
8 away-from the (die lblocklc'alrried by the block a
‘I, so that the faces of the dies are separated a '
su?lcient distance to allow the articles molded
with thedies to be moved clear ‘or the‘ dies_.l
The slidable block 8 is provided with a trans
Abylinder. 51, .surroundedby a heating mem
ber 58, is coupled to the end of the cylindrical
“spacer member‘ 55~by a grooved clamping ring 58;
'a bushing 58 being interposed between the end
of lthe=_lfinery~§4‘ and the cylinder.’
verse slot _4I in which is mountedQaf‘knock-out” ~
The construction _of the heater cylinder “does
bar. 42 which is provided with suitable. pins extend- ~
not form‘p'art‘of this_..,invention but the surround- ’
inglthrough theblock 8' to push‘the molded'ar 75. ing heater i‘proyides ‘a temperature ‘which’ serves
2,408,911: '
6
5
to plasticize the material forced through the bore
thereof by the operation of the ram 53, and the- '
more-or-less ?uid plasticized material ?ows
through the central opening of a nozzle 60 which
is bedded into sealing contact with a recess 1
the die mounted on the block ‘I.
v
-
It will'be noted that the hydraulic pressure
ings and joints are not operated- under pressure,
but ‘after the toggle has been 'closedpressure is
applied hydraulically by the introduction of the
hydraulic-?uid through the port 2| to iorcethe
piston 11 andits connected parts‘ to apply the
pressure directly through the locked toggle to the
die block.
-
It will be noted that the cylinder 35 is mounted
applied to the outward end of the piston 5|
on horizontal pivots so that the cylinder swings
through the port 6| in the end ?ange of the cyl
inder 50, is directly opposed to the hydraulic 10 freely in a vertical plane in raising and lowering
pressure applied to the die block through the
piston ll arranged in the abutment 3.
the toggle.
‘
the die blocks, and in order to obviate this and
as indicated in Figure 3, and by the operation of '
The plungers 62 of these cylinders 61 are con
nected to lugs 63 formed at either side of the
trolled valve is opened to admit hydraulic pres- '
It will be readily understood that contact mak
The operation of the plunger piston for inject- » ing and breaking'devices may be arranged at vari
ous parts of this mechanism to operate relays
ing the plastic material into the mold will be
controlled by suitable switches to follow im 15 'for the control of suitable time-controlled valves
so that the sequence of operation will follow in
mediately after the application of pressure to the
the proper order and with the proper timing. '
dies through the piston l1.
Assuming that the desired dies are properly
With the endwise pressure exerted against the
secured in position on the die holders 1 and 8
plastic by the plunger. it has the tendency to
force the cylinder, the spacer member and the 20 and the dies have been brought together face-to
face, the plate 28 will be in a horizontal position,
heating cylinder 51 away from its contact with
a valve hydraulic pressure is'admitted through
the consequent leakage of the plastic around the
the port 2! to apply pressure back of the piston
nozzle end of the injection cylinder, I provide a
pair of hydraulic cylinders 6] arranged at either 25 H and thereby force the die blocks together.
Immediately following the application of this
side of the spacer member and connected to the
hydraulic pressure against the dies a suitable vcon
?ange 49 of the frame 41.
sure through the ports 6| to the cylinder 50. A
block ‘I.
'
30 quantity of plastic material will have been de-'
posited in front of the plunger 53 through the
'Hydraulic pressure is directed into the ends of
hopper chute 56, and the movement of the plung
the cylinders 61 closest to the block ‘I through
er forces the charge of plastic material longitudi
conduits 54, and the pressure directed thereinto
nally into the cylinder 51 of the heater, forcing
operates against pistons carried by said plungers
within the cylinders 6| to create a direct pull 35 a charge of the plastic material previously fed
into the heater out through the nozzle 60 to ?ll
upon the plungers 62 and the block 1, holding
the die cavities.
'
'
the block ‘I and its die in close engaging contact
Hydraulic pressure is constantly applied to the '
with the end of the heater cylinder nozzle.‘
cylinders 6| so that the die block carried by the
Suitable switches and levers are arranged in
a panel 65 on the side of the base‘ | to effect the 40 holder 1 will be held tightly against the nozzle
66 to prevent leakage of the plastic material.
"
necessary control for starting and stopping, and
At the completion of the stroke of the piston 5|
suitable valves and other devices are arranged
and its plunger 53 suitable valves will be auto
within the :base I for controlling the time period
of movement of the different elements.
'
matically operated to connect the ports 66 at the
i
A machine constructed as described is found ~ — inner end of the cylinder 50 with the hydraulic
to be extremely e?icient in operation.
A very high pressure is exerted by the main
injection plunger 53 and this pressure is expended
in one direction centrally against the die blocks
but the pressure in the cylinder tends to force
the cylinder and the injection nozzle away from
the die blocks. This tendency is overcome by
an opposing pull exerted by'the plungers in the ~
cylinders 65! which are attached to the frame
carrying the main cylinder and their plungers
are connected to the block ‘I as described. Thus
a pull is exerted in one direction on the block 1
to counteract the pressure against the block. ex
erted through the injection plunger.
'
This equalization of pressures eliminates the
necessity of. ?ne adjustment in the setting of ‘the
main plunger cylinder and its connected parts
and also avoids the necessity of providing ex
tremely heavy main frame structures.
The ‘pressure applied to the meeting die blocks
through the operation of the piston ll arranged
in the abutment 3 is transmitted from the abut
ment 3 to the ?ange 5 and substantial equaliza
tion occurs through the pull in the opposite direc
tion exerted upon the block 1 by the plungers in
pressure supply and to open the port 6| to ex
haust, thereby reversing the travel of the piston
5| and the plunger 53.
Following the operation of the valve to e?ect
the return movement of the plunger 53 the valve
controlling the pressure through the port 2|
against the piston I‘! will be closed and the pres
sure allowed to exhaust.
Immediately following the release of pressure
. against the piston ll hydraulic pressure is di
rected through the port 39 to the bottom end of
the cylinder 35 to force the piston 34 therein in
an upward direction, operating the hinged plung
er 33 to swing the plate 28 upwardly, and simul
taneously operate the toggle links 29 to pull upon
the block 8, sliding it on the longitudinal tie rods
and separating the die blocks.
The movement of the block 8 effected by the
operation of the toggle brings the “knock-out”
bar 42 into contact with the adjustable rods 44,
and the movement of the bar 42 is arrested while
the block 8 continues to move, thereby forcing
suitable “knock-out” pins connected to the bar
42' or engaged thereby to push the molded arti
cles out of the die cavities from where they will
fall into a suitable receptacle.
the cylinders 6|.
Upon the completion of the upward stroke of
The arrangement of toggle mechanisms herein
the plunger 33 and the operation of the toggle and
described is extremely important. As the toggle
the block 8 the flow of pressure ?uid through the
operates freely through the manipulation of the
vertical plunger 33 in the cylinder 35 the bear 75 port 39 is closed and the port is open to exhaust,
2,408,811.
while1,-simu1taneo.usly
the
7
8 ,
port 40 leading to the, a
top of thecylinder is open to the inlet ‘of a pres
suret?uidand 1the;plu,nger'33“is ~moved :dOWl'lm _.
draulicmeanspivotally connected to and extend-,
lug-substantially right angularlylrom- said strut ' =
platejor raising» andv lowering. said toggle to move”.
wardly, ‘ therebynswinging theeplate' "28s- and the».
thatoggle-connectednie from» and‘ to themating ' ~
toggle‘links downwardly: so that-the block ,8 is: in
moved ‘horizontally ;to I bring-the - .1 dies- carried. ->
thereby back into face contact with the dies ,carr- -
ried ‘bythe block 1.
to swing; in- a vertical‘plane havinghollow trun-i ,
Inthe meantime. the ?ow of pressure ?uid to
the, vplunger cylinder 50 ' has been automatically
discontinued on the completion of the return
3. In a machine asnclaimed in claimv.2,va ~hy-a
draulic, ,cylinder .-mounted on\ horizontal - pivots
'10
strokelpf the plunger, and when the plate 28v has
beenswung downwardly. into ‘contact with the,
faceJZ of the block _II the pressure is again an-.
tomatically-applied to the piston I‘! while pressure.
is discontinuedthrough theportAUto the plunger. .
33.
It will be readily appreciated that numerous
formsof-control devicesin the formof relays,
nion-pivot'supportaa port leading from onehof.‘
saidwhollow trunnions’to the bottom end of said,
cylinder-,e porteleadinggfrom the other of said
trunnions to the?topiof ‘said cylinder, gandoa.
plungerv ‘mountedtin said cylinder . and . pivotally
connected atits upper end with thelockingstrut ‘
plate-‘piyotally connected with the hydraulically
operatedsmember in said abutment.
4. A plastic molding "machine, comprising ,a ,
base; an abutment-mountedat one end voil-said
base, ,a ?ange rigid-with-said base spaced from
switches and .valves may .be-utilized to accomplish 20 saidrabutment, horizontal tie rods extending‘ from;v
the sequence of operations of‘ the various elements.’
'said;abutment to ‘said-‘?ange, a die block holder, >
of’, this. machine, as has been herein described.‘
mounted on. said, tie ,rodsadjacent to said ?ange. ,
In the operation of a machine-such as described
it is sometimes found necessary to clear the in:
jection nozzle of plastic material which may flow 25
therefrom. during the periods when the pressure
‘
maybe relieved and in orderto accomplishthis
resultthe hydraulic pressure to the cylinders 6|
may be reversed, sothat the-plungers will be forced
a die blochholdenslidably mounted on-said tie, _
rods‘between- the aforesaid holder and said abut-g.
ment,‘ a horizontally movable-hydraulically oper_- I
atedimemberr mounted in said abutment, toggle -
links
connecting said hydraulically
operated _
member, with said slidable: die block- holder,- a
rigidlmember extending _from the toggle member.‘
outwardly to move the die holder 1 in the direc-v 30 connected to said hydraulically operated member; ,1
tion of the die holderB, while thetoggle is raised,
and adapted to engage in looking contact with
thereby. moving the block _1 andits‘die clear of v
said
slidable die-block holder toform a, rigidstrut
the ‘injection nozzle 6 and. permitting access
therebetween,- and mansion operetinesaid rigid. .
thereto for cleaning‘ or repair. .
What ,Iclaim as my invention is;v
locking ,imeinberito - ?rst clear- the rigid member - >
35 ‘from-Flocking contact‘with‘ the die block holden;
1. In a plastic molding machine, the combina- 7
thenrnoving said; dierblockl holder’ longitudinally >
tion with a pair of separable dies, of, toggle links:
on-saidltielrod, and then returningthe die block
connected with one of said dies to move same to
holder andjlocking sameprior to the application
ward and fromthe other of said dies, a strut plate .
of, compression pressure by, said hydraulically
separate from said toggle links’ adaptedto be '40 Operated. members ~
moved without compressive pressure .to engage-v
and lock the toggle operated die, hydraulic means
5.,Aplastic molding injection machine, com»
prisinga base, an injection cylinder plunger and a
arrangeduin angular relationtosaidstrut plate a
to move same into- and out of. lockingposition,v
heating,cylindenconnected, therewith mounted on
pressure directly to said. strutrplaterand die fol- V.
lowing thecompletion. of therclosingamovement .
of said strut plate and toggle links. .
and arranged-one at either-side of said injection
cylinder, .plungersmounted in saidpair of hy
said base, a diehqlder movably mounted on said
and hydraulic means’ for-applying- compressive. 45 base; a pair of ‘hydraulic cylinders mounted upon
draulic. cylinders rigidly connected to said mov
2. In a plastic molding machine, v‘the combina
ableidie vholder, means for directinghydraulic
tion with a pair of separable dies, of togglelinks '50 ?uidpressure
into said pair of cylinders to oper
pivotally connected to one of said dies, an abut
ate, said plungers to exert, a pulling force between;
ment arranged in ‘opposed relation to the latter,‘
saiddnJ'ectionCyhnder andsaid die block'in op
die, a hydraulically operated member mounted in
position to the vpressure exerted against the! die
saidabutment, toggle links pivotally connected to
bloclgby the ram of the injection-cylinder, a die
said hydraulically .operated member and.piv_-,_ . 55 block movably'mounted to and from engagement ,
otally connected to the aforesaid toggle?links'
with,.the aforesaid .die block, means for moving
a rigid, strut plate carried by the togglelinkcon- .. the latter die block toand from engagement with
nected to the hydraulically operated memberar
the. aforesaid dieblock, .and ‘means for exerting,
ranged to engagein locking .contactfree from.
hydraulic pressure against said movable die block
endwise pressure _ between the .die, connected to 00 in oppositionto the pressure exerted thereagainst
said‘toggle and said hydraulically operatedmeml-y- . ‘by the-‘operationof the injection plunger.
ber-to form a rigid strut therebetween, and hy:
ARTHUR A. BURRY.
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