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Oct. 8, 1946'.
c. E. MccoY
Filed Feb. 11, i942
2 Sheets-Sheet 1
Oct. 8, 1946.
c. a MecoY
_ 2,409,142
Filed Feb. 11, 1'942
v 2 sheets-sheet 2
_ .M
f,_ _ Mc___m
Patented Oct. 8, 1946-
' Clarence E. McCoy, Western Springs, 'Ill„'assi_gnor Yto 'Western Electric Company, Incorporated,
New York, >NJK., a corporation of NewYork
,Application =February 11, 1942, Serial No. 430,391
15 Claims. (01.18-16)
a threaded article where a> threaded mold core is
plate .8 comes into contact with upper nuts I0
which are adjustably mounted on threaded posts
9. Since the "knockout pins are vheld stationary
when the nuts 'I0 contact the plate 8, continued
upward movement of the force will effectively
used lto produce the threads, this core must, of
eject a molded article from the force.
This invention relates îto _a molding rapparatus
and more particularly to an apparatus -for com
pression molding threaded articles.
In the Vusual molding apparatus for molding
On the
other Íhand, when'the fo-rce is moved downwards,
the plate '8 contacts lower nuts Il `which are also
adjustably mounted on ‘the kposts "9 and the -pins
order to prevent it vfrom rotating and thus inter 10 are retracted so that their ends will be flush with
the surface of the 'force when the >mold is closed.
fering with lthe removal of the core.
These posts are rigidly Vsecured to -the beam 3S
Itis an object of the .present invention lto pro
at "their lower ends and their'upper ends enter
vide an efficient and effective apparatus for auto
suitable apertures 'in the peam 3-1.
matic compression molding of threaded articles.
A threaded core I2 is set in the lower section
In one embodiment of this invention, a mold
of the mold in the cavity 5, and >is connected to
ing apparatus for _molding internally threaded
articles may Ppe used comprising ~a resiliently
the mechanism at the‘base `of the apparatus by
course, be removed from the article by uri-screw
ing the core. It has usually been necessary that
the article be irregularly .shaped or knurled in
mounted sectional mold having a rotatable mold
core `and means for unscrewing the core prior to
a tubular 'column I3 'having a lflange 4T at its
lower extremity. ‘This ‘column _is suitably thread
the opening ofthe ymold so that the :molded article 20 ed to receive a nut 'I`6 and lool;> nut i5 which rest
on the >upper end o-f a coil‘spring I4 and are‘used
will he prevented from xrotating 'by »the vpressure
to adjust the load on this spring. The purpose
of the mold on >the article, the unscrewing of the
of this >spring is to permit the mold core to move
core being effected :before the Imold _is returned
downwards should therarn move too Ifar -or should
to the position from which it is opened.
ther advantages Aand objects will he apparent 25 something‘become ljammed in the mold. As may
be seen in Fig. ‘2, 'the lower portion of the tubu
in the following detaileddescriptíonftaken in `con
lar column I3'is`hol'low‘to receivespring I8 which
junction ~wit-h the accompanying »draw-ings where
rests on the'llD‘Der end of 1a Álow-speed shaft I9
of a vertical type ~speed reducer _212. The lower
Fig. 1 represents aside elevation partly in sec
tion of the »molding apparatus, the mold being 30 end ‘of thisf'tu'bular column «is designed to receive
Fig. 2 is :an _enlarged sectional View of apart of
the mold apparatus, with'the ¿mold closed;
Fig. '3 -is »a schematic-representation of a vcircuit
Vused with this molding apparatus.
The molding apparatus, as shown `in VVFigs. l1
and 2 comprises Vafbase 45 _on which are rigidly
mounted two standards A4. A cross-beam 31 is
attached to the top of these standards and sup
,the shaft ~I 9 and is suitably 'keyed thereto. Spring
-bumper jblocjk 2.0 .and ,ring Y2i hold a washer I'I
which supportsgthe‘lower end of spring id. Space
-is provided ‘for ñange v4l to Vmove downwards or
35 upwardsas vthe case may be, should lthe mold core
and the columniâ 'be moved. As explained, the
purpose .of ithis spring is to prevent damage to
the parts. Occasionally the ram motor will not
.be stopped lexactly as planned /but will move the
ports Ythrough springs 39e, cross-head 35. Cross 40 mold ,slightly further. 'By vmounting the mold
colte >on'the Aspring and 'providing room for the
head 35 inturn supports the movable cross-beam
associatedparts `to move'infit‘has‘been found that
35 by means of rods 38 which pass through suit
such'over-‘movement as occurs'is compensated for
able apertures in lcross-beam 31. A ram 3l is
and "hence‘injury'to the apparatus is avoided.
mounted in the center of the beam 31 and is pro
Fig. 4lshows‘the machine with the mo-ld open
vided with a gear 32 which is driven by a gear 45
to'receive molding material from a suitable mc
34 mounted on the shaft of a motor ‘33. Means
for controlling the operation of this motor are
tering device. v.In 'this -positionplate ,8 Vis in con
tact with Vthe upper .nuts and ._theknockout ,pins
conventional and, therefore, vare not shown.
p The molding .chamber is >separable and com
extend ibelow ‘the surface of tlîle‘force i4 a suffi
prises an upper section or forced mounted on the 50 cient distance to positivelyfeiect,anartiele .there
lower end of the ram SI, anda lower section '3,
having a cavity 15, mounted on the cross-beam
from. ‘The threaded portion of the mold core
`I21is'just‘below'the bottom of' themold cavity 5.
Molding >material-is then placed yin the lower part
Knockout pins ‘I are adjustably fastened to
of --the mold, -motor 33 ~is `actuated and the ram
a plate 8 which is suitably mounted inthe force
so that when the force is raised by the ram, the 55 3| begins to -rnove downward. -Plate Lil contacts
being completed again until this relay is closed
even though switch 28 be closed, since closing
the lower nuts Il and as the mold closes the
knockout pins are retracted. The ram continues
to move downwards after the mold is closed, thus
causing the beam 36 and cross-head 35 connected
thereto to move downward against the pressure
of springs 39. Spring I4 is heavy enough so that
the mold core l2 remains substantially stationary
and thus, as the mold moves downward, the core
will enter the mold cavity; and since the mold
contains suñicient molding material to just ñll
the mold when the core is inserted in the mold,
the material will be compressed so as to be
threaded and to assume the shape oi the mold.
When the mold core has‘enter‘ed the required
distance, that is, the distance necessary to pro
duce the number of threads desired on the molded
article, the downward movement of the mold is
switch 28 does not close relay 29. The closing'
of relay 29 may be accomplished only through
switch 21. As the beam `36 travels downward,
the arm 4| moves away from switch 28, and switch
28 closes. Arm 4| then contacts switch 21 which,
as aforesaid, closes relay 29, but, since in ener
gizing relay 29, the circuit to magnetic switch
30 is opened simultaneously by switch 21, the
circuit to the motor is not completed. It will be
obvious that if this were not done the motor 23
would be actuated as soon as relay 29 closed and
the mold core would rotate before the upward
movement of the mold began. Instead, when the
mold is completely closed and the ram has moved
downwards its full distance of travel, the switch
stopped by deenergizing the ram motor. Means
28 `is closed, relay 29 is closed by the switch 21,
for doing this are not shown.
but magnetic switch 30 is open and hence no power
The closed mold
andA associated parts then occupy the relationship
ls supplied to the motor 23.
shown in Fig. 2. A suitable timing mechanism is
employed to hold the mold closed a sufficient time
to cure the mo-lded material. At the termination
As the ram moves the associated parts upwards,
switch 21 operates and closes the circuit to mag
netic switch 30. Relay 29 is locked closed now
by the circuit through the closed switch 28. Clos
of this predetermined curing period, during which
the mold may be heated, the ram-driving means '
ing the magnetic switch 39 operates the motor
23. Motor 23 will then continue to operate until
is reenergized to operate in the reverse direction.
its circuit is broken by arm 4l contactingr switch
As the mold is moved upwards by> reversing the
28 and breaking both the power circuit to the
operation of the ram, the threaded core must be
motor and the locking circuit to relay 29.
unscrewed from the molded article. The core is
Because the force 4 presents a substantially
rotated by the shaft I9 of the speed reducer 22
greater surface to the molded article, the molded
which is driven by a motor 23 to which the re
article will adhere to the surface of the force in
ducer is connected by a V-belt 28 running over
stead of the lower part of the mold and will be
adjustable pulleys 24 and 25. 'I‘he operation of
completely removed from the mold cavity by the
this motor is controlled by micro-switches 21 and
28, relay 29 and magnetic switch 38 as will be 35 upward travel of the force. As the upward move
ment continues, the plate 8 contacts nuts I9 and
explained in detail hereinafter. The speed of
the knockout pins are then actuated, thus eject
rotation of the mold core is carefully synchronized
ing the molded article from the force. An air
with the speed of upward movement of the mold
blast may then be used to remove the molded
by means of the adjustable pulleys 24 and 25
so that the molded article is withdrawn from the 40 article from the apparatus as it drops from the
force. Means for doing this are conventional and
threaded core at the same rate as the threaded
are no part of the present invention. As the
core is released from the molded article by be
ram moves upwards, the springs 39 return cross
ing unscrewed, thus putting no undue pressure
head 35 and beam 36 to their positions before
on the threads of the molded article. Since the
pressure was applied by the ram. The upward
mold remains closed until it has moved upwards
travel of the ram is stopped when a switch (not
the same distance it moves downwards While
shown) deenergizes the ram-driving means, thus
closed, it will be apparent that the molded article
completing the cycle of operation.
will be firmly held by the mold pressure. This
While the foregoing describes a mechanism for
pressure effectively prevents rotation of the ar
ticle as the core is unscrewed even though the 50 producing a particular internally threaded part,
the design is equally applicable to other exter
surface of the article is in no way roughened.
Thus, smooth-surfaced threaded articles may be
molded in this machine and the threading means
removed automatically therefrom with no danger
of the article rotating and consequently interfer
ing with the removal of the threading means.
Power to the motor 23 is controlled through
the switches 21 and 28, locking relay 29 and the
magnetic switch 30. As may Abe seen in Fig. 1,
a threaded rod 42 is mounted on the under side
of the movable cross beam 36 and an arm 4I is
adjustably mounted thereon and at right angles
nally or internallythreaded parts, and it will be
understood that the nature and embodiment of
the invention herein described is merely illustra
tive and many changes and modifications may
be made therein without departing from the spirit
and scope of the present invention.
What is claimed is:
l. An apparatus for compression molding a
threaded article including a sectional mold, a
rotatable, threaded mold core, means for clamp
ing the sections of said mold together to close
said mold, means for moving said mold. a motor
>for rotating said core, a current supply for said
65 motor, a magnetic switch for controlling the
energization of said motor, a double pole relay
thereto. This arm operates the micro-switches
21 or 28 depending on the position of the cross
beam 36. When the mold is fully opened, micro
switch 28 is contacted by the arm 4I and is opened.
associated with said magnetic switch for oon
This is the position shown in Fig. 1. As may be
trolling the _energization of said magnetic switch.
seen in Fig. 3, which shows the circuit used, open
a normally closed single contact switch connected
ing micro-switch 28 breaks the circuit to the
magnetic switch 38 which in turn stops the motor 70 to said current supply, said switch being oper
able to deenergize said relay a double contact
23. At the same time it opens the relay 29. Re
switch normally biased to complete a circuit from
lay 29 and micro-switches 21 and 28 must all be
said Single contact switch to said magnetic switch
closed to actuate magnetic switch 39. Thus, it
but movable to open said circuit and to energize
will be apparent that opening relay 29 by the
said relay, a holding circuit completed by the
actuation of switch 28 prevents the circuit from 75 energizing of said relay when said single contact
switch is closed for holding said relay closed as
netically operated switch energized by the actu»
said double contact switch returns to its normal
biased position, a second circuit prepared by the
energizing of said relay, said second circuit con
necting the magnetic switch to the double con
tact switch, and means operable in response to
the movement of said mold for alternately actu
ating said single contact switch and said double
contact switch.
ation of said double contact switch, means for
energizing said magnetically actuated switch upon
the actuation of said double contact switch, said
motor being deenergized upon the actuation of
the single contact switch.
4. In an apparatus for molding a threaded ar
ticle, a separable molding die having an upper
and a lower section, a, resilient support for said
2. An apparatus for molding threaded articles 10 lower section, a rotatable threaded mold core
comprising a mold section, a resilient support
receivable in said lower section, said cone being
therefor, a rotatably mounted threaded core re
substantially stationary in a longitudinal direc
ceivable in said resiliently mounted mold section,
tion reversible means for moving said upper sec-`
a second mold section movable toward said resil
tion with respect to said lower section to clamp
said sections together and to move said sections
iently mounted mold section to close the mold,
means for moving said movable mold section to
ward said resiliently mounted mold section to
close the mold, compress the support and to cause
as a unit against the pressure of said resilient
support to cause said core to enter said lower
section, and means for rotating said core to un
said rotatable core to move into said resiliently
thread said core from said article during the
mounted mold section, means for reversing the 20 reverse movement 0f said mold moving means and
movement of said movable mold section whereby
while the die is closed.
said resilient support will retain the mold closed
5. In an apparatus for molding a threaded ar
during a predetermined portion of the movement
ticle, a separable molding die having an upper
of said movablevmold section, and means for ro
and a lower section, a resilient support for said
tating said core to unthread it from a molded 25 lower section, a resiliently mounted rotatable
article While the mold is closed during said reverse
threaded mold core substantially stationary in
a longitudinal direction receivable in said lower
3. An apparatus for compression molding a
section, reversible means for moving said upper
threaded article including a sectional mold, a ro
section with respect to said lower section to clamp
tatable, threaded mold core, means for clamping 30 said sections together and to move said sections
the sections of said mold together to close said
as a unit against the pressure of said resilient
mold, means for moving said mold sections, a
support to cause said core to enter the lower
motor, a motor control circuit including a single
section, and means for rotating said core to un
Contact and a double contact switch operable in
thread said core from said article during the
response to movement of one of said mold sec 35 reverse movement of said mold-moving means
tions, a magnetically operated switch for energiz
and while the die is closed.
ing said motor, a holding circuit for said mag
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