Oct. 8, 1946'. 2,409,142 c. E. MccoY MOLDING APPARATUS Filed Feb. 11, i942 2 Sheets-Sheet 1 44 l5. I6 / l l ,8f Ã A;fran/vf? Oct. 8, 1946. ` c. a MecoY _ 2,409,142 HOLDING APPARATUS Filed Feb. 11, 1'942 v 2 sheets-sheet 2 2 _yÑ 3. fw_„J _ .M a; ß, M.\ _ mw? f,_ _ Mc___m 2,409,142 Patented Oct. 8, 1946- vUNITED STA-rss PATENT for-‘FICE ' 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) 1> 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 m 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 open; 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 2,469,142 3 . 4 4 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 60 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 2,409,142 5 6 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 movement. 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 CLARENCE E. McCOY.