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'Nov. 12, 1946._
' 2,410,909
Filed .April 28, 1944
Patented Nov. 12, W46
Warren’ R. Tucker, Dayton, ' Ohio, assignor to
H-P-M Development Corporation, Wilmington,
DeL, a corporation of Delaware ,
Application April 28, 1944, Serial No. 533,105’
4 Claims. - (01. 1s-T30)
This invention relates to molding apparatus
and, in particular, to a hydraulically actuated
?tted with a booster ram for the purpose of
molding machine.
the beginning of- a working cycle. A valve is pro
effecting the rapid closing of the mold halves at
' I'n them'olding of plastics and similar sub
vided which directs pressure ?uid to the main
stances the': functions‘ to be accomplished by a
clamping area'of the upward acting ram when
machine include the clamping together of mold
the mold halves are closed so as to maintain the
halves or dies having cavities therein de?ning
same clamped together under full clamping force.
the shape of the workpiece to be formed and, the
“A pressure responsive Valve is included in the
injecting into the said cavity moldable material.
hydraulic connection between the injection
Usually the functions of clamping the molds 10 plunger and the main clamping plunger so that
together and injecting the plastic therein are - when the clamping pressure has reached the de
accomplished by separate units which may, if
sired level the actuation of the injection plunger
desired, be integrated by a timer or other suit
automatically follows. Asecond ?uid connection
able interlock so as to provide for a substantially
is provided between the retraction areas of the
automatic cycle. Also, the power units for sup 15 two plungers so that when the mold halves are
plying power for‘clamping and injecting are usu
' opened, the injection plunger automatically re
ally separate devices which may be mounted on
tracts also.
a common base or frame.
Detailed description
The primary object of the present invention
is to provide a molding machine wherein the 20
Referring more particularly to the drawing,
functions of mold clamping and plastic injection " the press according to this invention comprises
are combined in a relatively simple structure.
a cylinder ll! within which is reciprocably mount
It‘ is. another object to provide a hydraulic cir
ed the double acting plunger ||. Attached to the
cuit for a machine of this type wherein the func
end of the plunger H by any suitable means is a
tion of injection is positively and automatically
platen I2 which is adapted to'carry a mold or die
sequenced relative to the function of clamping.
' half l3. The die half M which is adapted to co_
It ‘is still another object of vthis invention to
operate with the die half I 3 is carried by the ?xed
provide an improved hydraulic actuating system
for a molding machine of this type.
press bed l5.
The bed l5 is rigidly secured to, and positively
These and other objects will become more'ap 30 spaced from the cylinder ill by means of the
parent upon reference to-the following descrip- ‘
strain rods l6 and nuts H.
tion and the attached drawing, which is a sec
‘The cylinder Ill and plunger || may be ?tted
tional view of a molding press constructed ac
with a booster ram, l8 so as to provide for the‘
cording to this invention and provided with an
rapid closing oflthe mold halves. The booster
improved hydraulic actuating system.
35 ram I8 is bored axially as at I9 to provide for
> General arrangement
?uid communication with the bore 28 in the
plunger ll‘. ' The plunger I |. is also bored as at
' The general arrangement of the press and sys
2| to receive theinjection plunger 22.‘ The in
tempof this‘invention, as shown in the drawing,
jection plunger 22 comprises a piston portion re
comprises, preferably, an upward acting hydrau
licram to which is attached a platen; The platen
40 ciprocable in the said bore 2i and a reduced
- diameter portion 23 which extends through the
is'adapted to carry one of the pair of mold'or die
platen l2 and enters a cavity 24 within the mold
half IS. The cavity 24 is for the purpose of re
supported on a ?xed bed member.
ceiving i the moldable‘ material which is to be
The upward acting ram is bored to receive a 45 transferred or injected by the plunger 23 into
reciprocating plunger, the function of which is to ' the cavities 25' inthe mold halves | 3 and I4.
halves, the other of which is suitably stationarily
‘ transfer or inject plastic into the cavities Within
the mold halves when the latter are closed to
The upper endof the bore 2| is connected by
a passage 26 with the smaller or retraction area
of the plunger | |. The lowerend of the bore 2|
~~According to this invention, the pressure ?uid 50 is connected through a check valve 21 with the
for ‘actuating the injection plunger is derived
booster bore 20. The check valve 2‘! permits ?uid
from~4the main area 1of the said upward acting
flow from the bore 2| to the bore 20 but not vice~
plunger,‘ thereby insuring-thatthemold halves
are clamped together before the plastic is injected
' 'The'lower end 01‘ the bore 2| is likewise con
therein, The main plunger may, if desired,_be 55 nected‘
a passage 28 with a valve 29 mounted
rod 53 and the valve member 52 upwardly to
establish ?uid communication between the con
duit 43 and the advancing side of the plunger ||.
Preferably, the valve member 52 is shifted just
in the platen l2. The valve 29 is connected by a
passage 30 with the larger or advancing side of
the plunger ||. The valve 29 is preferably an
adjustable pressure responsive valve and is ef
fective, upon the accomplishment of a predeter
prior to the actual closing of the molds so that
the upward speed of the plunger II is substan
tially reduced thereby preventing any damage to
mined pressure on the advancing area of the
plunger H, to establish ?uid communication be
the mold halves l3 and I4.
tween the said advancing area of plunger | l and
After the mold halves l3 and I4 have been
the advancing area of the plunger 22.
For the purpose of supplying ?uid pressure to, 10 engaged, the pressure on the advancing side of
the plunger | I builds up until the desired clamp
the press, a pump 48 is provided which delivers .
ing force is developed by the said plunger. When
pressure ?uid to a distributing valve 4|. The
the required pressure has been developed, the
valve 4| is connected by a conduit 42 with the
retraction side of the vplunger H and, by a con
duit 43 with the bore IQ of the booster plunger
I8. A conduit 44 connects the valve 4| with a
reservoir 45 from which ?uid is drawn by the
pump 45 through a conduit 46.
A conduit 41 which includes a check valve 48
interconnects the advancing area of the plunger 20
same is effective to shift the valve 29 to establish
?uid communication between the passages 28 and
35 thereby permitting pressure ?uid from the
said advancing area to actuate the plunger 22
to accomplish the injection of the molding mate
rial into the cavities 25.
Upon the accomplishment of a dwell period,
if desired, the plunger l | is retracted to open the
|| and'the reservoir 45. The valve 48 permits
mold by shifting the valve 4| into position to
free ?ow from the reservoir to the said advancing
deliver pressure ?uid through the conduit 42 to
area but prevents the ?ow of ?uid in the oppo
the retraction area of the said plunger while
site direction. The purpose of this connection,
simultaneously exhausting the booster bore 20
which will become more apparent hereinafter, is
and the advancing area of the plunger l|.
to permit the ?lling with hydraulic ?uid of the
When the plunger | | retracts, the plunger 22 is
advancing chamber of the cylinder Hl during the
also retracted by ?uid conducted thereto through
initial rapid closing of the mold halves.
the passage 26. As the plunger 22 retracts the
A conduit 55 which includes a two-way valve
5| connects the advancing chamber of the cylin 30 ?uid on the advancing side thereof passes
through the check valve 21 into the booster bore
der H] with the conduit 43. The valve 5| in
26) from which it is exhausted as previously men
cludes a valve member 52 adapted, selectively, to
tioned- As the platen l2 approaches its fully
establish or interrupt the continuity of the con
retracted position the arm 59 engages the collar
duit 5B. Attached to the valve member 52 is a
54 and moves the valve member 52 downwardly
rod 53 which passes through lugs providedon
into the position shown in the drawing, at which
the bed and cylinder of the press. The rod 53
time the member 51 engages the collar 56 there
has attached thereto a collar 54 which is engaged
by retaining the valve member 52 in its down
by a spring 55 which tends to urge the said collar,
ward position until the platen again moves up
together with the rod 53 and the valve member
52, upwardly. For the purpose of permitting the 40 wardly to actuate the said latch member. When
the valve member 52 has been moved into posi
advancing chamber of the cylinder H] to be ex
tion to interrupt ?uid communication between
hausted when the valve 5| is closed, the said
the advancing chamber and the conduit 43, the
valve is bypassed by a conduit including a check
check valve 60 is effective to permit the exhaust
valve 60 which permits ?uid ?ow from the said
45 of ?uid from the said advancing chamber.
advancing chamber but not vice-Versa.
It will be apparent that various modi?cations
The rod 53 also has attached thereto a collar
may be made in the structure and hydraulic cir
56 which is adapted to be engaged by a latch
cuit of the device shown in the drawing without
member 51 which is effective to maintain the rod
in any way departing from the spirit of the in
53 and the valve member 52 in their down-ward
position until the press platen l2 has reached a 50 vention. For example, the valve 5| could be
operated by pressure established within the
predetermined position during the advancing
booster bore 26 without materially effecting the
stroke thereof. An adjustable member such as
operation of the press. Likewise, the particular
the screw 58 is provided in the platen l2 .for the
arrangement of valves and passages is only in
purpose of engaging the latch 51 at the said pre
determined position. The platen |2 likewise has 55 tended to be exemplary and does not represent
the only possible arrangement.
an arm 59 formed thereon which} engages the col
, It will also be apparent that this invention can
lar 54 andmoves the same, together with the rod
53 and the collar 56, downwardly until the latch
member 51 engages the collar 56 when the platen _
reaches a predetermined retracted'position.
be applied to a horizontally disposed molding
machine as well as vertical machine without
60 materially eifecting the mode of operation of this
invention. Also, it will be apparent that a press
In operation, a charge of plastic or material to
be molded, is placed within the cavity 24. The ‘
valve 4| is then shifted to deliver ?uid into the 65
conduit 43 and thence through the bore l9 into
the bore 20 while simultaneously exhausting the
retraction side of the plunger || through the
conduits 42 and 44;
constructed according to this invention is not
necessarily limited in scope to the molding of
plastics. cut could as well be used for die casting
of metals and similar operations.
Accordingly, it will be understood that I do not
wish to be limited by the particular structure and
arrangement shown in the drawing, but desire to
comprehend such modi?cations thereof and sub
With the valve 4| so shifted, the plunger ||' 70 stitution of equivalents‘ as come within the scope
of the appended claims and the invention.
moves upward rapidly until the screw 58 en
Having thus fully described my invention, what
gages the latch 51 rotating the latter clockwise
I claim as. new and desire to secure by Letters
so as to release the collar‘ 55 from engagement
therewith. When the collar 56 is disengaged from ,, 1 Patent,'is:
the latch 51, the spring 55 is effective to move the 75
1. In combination; a cylinder; a ?rst plunger
reciprocable in said cylinder; a bore in said ?rst
plunger co-axial with said cylinder; a second
plunger reciprocable in said bore; valve means
hydraulically connected with said ?rst and said
second plungers and operable in response to a
predetermined pressure on said ?rst plunger for
establishing ?uid communication between said
plungers; and a ?uid source for supplying pres
3. The combination in a molding press having
a stationary platen and a movable platen; of a
double acting ram connected with said movable
platen for clamping mold halves together; cen
tral axial bores extending into said ram from
opposite ends thereof; a booster plunger extend
; ing into one of said bores; a double acting in
jection plunger reciprocable in the other of said
sure ?uid to said ?rst plunger for actuating the
bores and extending through said movable plat
same, a ?rst passage‘ in said ?rst plunger con 10 en, a fluid source to supply actuating ?uid to said
necting one side of the same to one side of said
booster plunger for rapidly closing said mold
second plunger, a second passage in said ?rst
halves and to one side of said clamping ram for
plunger connecting the other side of the same to
maintaining said mold clamped together said ram
the other side of the second plunger, said valve
having a first passage connecting one side of
means being located in said second passage, and 15 the same to one side of said injection plunger;
means connecting said passages to said ?uid
a second passage in said ram connecting its other
side to the other side of said injection plunger;
2. In a molding press; a double acting clamp
pressure responsive means in said second pas
ing ram; a central axial bore in said ram; a
sage; a third passage extending through said
double acting injection plunger reciprocably 20 booster plunger and said ram to said other side
mounted in said bore; means continuously hy
of said injection plunger; and a check valve in
draulically connecting the retraction side of said
said third passage, said source being connected
plunger with the retraction side of said ram com
to said passages.
prising a ?rst passage in said ram connecting one
4. In a molding press having a stationary plat
side of the same to one side of said injection 25 en for supporting a stationary mold half and a
plunger; a second passage in said ram connect
movable platen for supporting a movable mold
ing the other side of the same to the other side
‘half; a double acting ram connected with said
of said injection plunger; valve means in said
platen for actuating the same in mold closing and
second passage connected with the advancing
opening movements; central axial bores extend
side of said plunger and the advancing side 30 ing into said clamping ram from opposite ends
of said ram and operable in response to a pre
thereof; a double acting injection ram recipro
determined pressure on the latter for estab
cable in the one of said bores adjacent said plat
lishing ?uid communication between said ad
en, a stationary booster ram extending into the
vancing sides; a third passage leading from said
other of said bores; and means of supplying actu
other side of said ram to said other side of said 35 ating .?uid sequentially to said rams for a com
injection plunger and valve means therein oper
plete molding cycle said last named means in
able during the retraction stroke of said plunger
cluding a ?rst passage in said ram connecting
for bypassing said pressure responsive valve; and
one side of the same to one side of said injec
a source of pressure ?uid connected to each of
tion plunger; a second passage in said ram con
said passages and selectively operable for sup 40 necting its other side to the other side of said
plying ?uid to the advancing or the retraction
injection plunger, pressure responsive means in
side of said clamping ram; whereby the supply
said second passage, a third passage extending
of pressure ?uid to the advancing side of said
through said booster plunger and said ram to said
clamping ram is effective to move the same into
other side of said injection plunger; and a check
clamping position and, subsequently, to actuate
said injection plunger and the supply of pres
sure ?uid to the retraction side of said clamping
plunger is effective simultaneously to retract both
said ram and said plunger.
valve in said third passage and a source of ?uid
connected to said passages.
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