US2567715A - Hydraulic press control - Google Patents

Description

Sept. 11, 1 51 E. F. KEUSCH ET AL 2,567,715

HYDRAULIC PRESS CONTROL Filed Feb. 19, 1946 5 Sheets-Sheet 1 Fl G. L

arr/0W5 EFKauscn d L O REICHELT.

Sept. 11, 1951 E. F. KEUSCH ETAL HYDRAULIC PRESS CONTROL Filed Feb. 19, 1946 5 Sheets-Sheet 2 gvwa/wbcws E. F. KEuscH 0 L0. Rmcmzur.

Sept. 11, 1951 E. F. KEUSCH ET AL 2,557,715

HYDRAULIC PRESS CONTROL Filed Feb. 19, 1946 5 Sheets-Sheet 5 E. F". KEUSCH L O. REICHEL FIG. 3.

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Sept. 1 1, 1951 E. F. KEUSCH ET AL HYDRAUL IC PRESS CONTROL 5 Sheets-Sheet 4 Filed Feb. 19, 1946 m m N hmmx 5mm &

m A F Sept. 11, 1951 5 Sheets-Sheet 5 Filed Feb. 19, 1946 4 53 M d W a T. Ca i \ol my N I C H 0 a w m SQ human L a .M E KR gm 9n mmm I|1l F m5 0% r EL A v\ fl.. t! mmn hmm Patented Sept. 11, 1951 2,567,715 HYDRAULIC rimss CONTROL Edwin F. Keusch, Verona, and Lester 0. Reichelt, Cranford, N. J., assignors to Western Electric Company, Incorporated poration of-New York v: Application February 19, 1946, Serial N 0. 648,689

22 Claims. 1

This invention pertains to control systems ior molding presses, and in particular to such systems for controlling the operation of angle molding presses.

' One object of the invention is to provide a hydraulic-electrical control system for the automatic operation of an angle molding press.

Another object is to provide a control system which is highly eflicient in automatically efiecting selective operation of the vertical and'ho'rizontal rams of the press through various cycle portions at different speeds and at predetermined time intervals.

" Another object is the provision of a low. pressure, high volume pump to obtain fast operation of a hydraulic ram and a high pressure, low

volume pump to obtain low speed operation of the ram for actual molding operation in cooperation with means for. rendering one of the pumps ineffective upon the occurrence of a predetermined condition.

Another object is the provision of selective controls for hand and cycling operations and of an interlocking protective system to permit either selective manual operation or automatic cycling operation of the rams.

Another object is to provide a controlled timing system for an angle molding press-whereby the molding die is closed by the rams to subject the molding material therein to a predetermined pressure and then one of the rams retracts a desired distance to permit breathing for the escapement of gases from the molding die and subsequently again reverses to apply an increased molding pressure until the end of the cure of the molded article. molding die is of particular advantage in the melding of synthetic resin materials and similar chemical compounds where the breathing period expedites the proper distribution of the molding materials in the die,-permittingth escapement of gases and thus insuring solid molded articles of uniform quality.

Another object is to provide safety switches in the electrical control system to limit the out and This feature of breathing the down travel of the horizontal and vertical rams to prevent damage to the press; 7 With these and other objects in view, the invention comprises an interlocking selective control system, particularly for angle molding presses wherein the movements of the horizontal and ver tical rams of the press are controlled by the admission and release of pressure fluid supplied by a low pressure, high volume pump and a high pressure, low volume pump by means of pilot con- New York, N. Y., a cortrolled valves operated by electric solenoids, the latter being energized and deenergized by an electrical system to provide various speeds of operation of the rains and to control their movements at predetermined intervals.

Other objects and advantages will be apparent from the following detailed description when considered in conjunction with the accompanying drawings, wherein: a

Fig. l is a fragmentary front elevational view of an angle molding press equipped with a three part molding die and showing limit switches controlling the out and down movements of the horizontal and vertical rams respectively;

Fig. 2 is a diagrammatic view of the fluid pressure system fOr controlling the movement of the horizontal and vertical rams of the angle molding press of Fig. 1

Figs' 3, 4, and 5 constitute a wiring diagram illustrating the electrical control system for the structures shown in Figs. 1 and 2, and

Fig. 6 is a perspective View of part of a phenol plastic mounting strip made in a three part molding die on the angle molding press of Fig. 1 controlled by the present invention.

Referrin now to the drawings, attention is first directed to Fig. l which illustrates an angle molding press designated generally by the reference numeral ID. This angle molding press includes a case steel base II to which are secured four columns or posts l2 which carry a crown or head l3. The two left posts l2 are housed within a vertical steel strut M which is held in accurate alignment by keyways H5 at junction points with the head [3 and base II. Mounted centrally in the head I3 is a vertical hydraulic cylinder l5 which contains a reciprocable piston ll secured to a ram I8 (Figs. 1 and 2). I

A cross head [9 having a flange 201s secured to the vertical ram It. This flange is machined and brass lined. and engages a vertical guide slot in the strut I4 to positively guid and align the ram in its up and down movement. Fastened to the under side of the cross head l9 on the vertical ram I8 is an upper part 2| of a three part molding die 22 for making the molded article or mounting strip 23 shown in Fig. 6. .A left hand stationary portion 24 (Fig. 1) of the die 22 is held in proper alignment in a cross head 25 secured in the frame I I, and a movable right hand portion 25 of the die is secured in proper alignment in a cross head 21 secured to a horizontal ram 28.

the die parts 24 and 26 closed, and the vertical 7 ram I8 is used for applying the molding pressure through the third die part 2|. Alsosuitable means (not shown) is provided tor heating the molding die to cure the molded article-l Hydraulic system The hydraulic orfluid pressure systemicr actuating the horizontal and vertical rams oft-he press includes an oil reservoir (Fig.2) two highprQS sure, low volume pumps 363'| driven by a double end motor 38,, a. prefill or low pressure high volume pump 35 driven by a motor 40; three inure way hydraulic valves El, 42 and 43', which are solenoid controlled and pilot operated and interconnected by pipe lines to carry the oil under pressure. as, disclosed in Fig .2.

Each of; the four-way valves 4|, 42 and 43 is spring, centered dual, solenoid pilot operated with cylinder ports closed and supply port opened to exhaust in neutral position when both solenoids are deenergized. This construction permits unloading the pump volume back to the oil; reservoir 35' during idle operation. These four-way valves are of standard well known construction and need not be described further.

The horizontal ram 28 is moved toward the left to in position, to close the die parts 24 and 2B- by the energization of a horizontal in advance solenoid 45 which operates a pilot valve 46 to shut its normal exhaust line 41. to the oil reservoir. High pressure oil then flows from pump 55 through pipe 48, pilot valve 46 and pipe 49 to actuate the four-Way valve 4| to permit oil under low pressure and high vQlumeto be fed from the tank 35 through lowpressure pump 39, pipe 50, valve 4|, pipe 5| into the right hand end of the horizontal cylinder 30. simultaneouslya solenoid 52* is energized to operate its pilot valve 53. Operation of" this pilot valve closes itsexhaust line 54 to the oil reservoir and high pressure oil then flows from pump 36 through pipe 55, pilot valve 53 and pipe 56 to actuate valve 42. The actuation of valve 42 causes high pressure oil also to be admitted into the right hand end of the horizontal cylinder 30 from the tank' 35 through'high pressure pump 3-'|, pipe 51, valve 42 and pipe 58' into the cylinder 30* to move the ram 28 at high speed toward the left to in position.

The four-way valve 42 is so constructed that upon providing communication between the pipes 51 and 58, communication is also simultaneously established between an exhaust pipe 59 and a pipe so as to allow the fluid on the'leftside of the piston 23 of the ram 28 to exhaust through the pipe 60, valve 42, pipe 58 to the oil reservoir 35.

As the horizontal ram 28 moves at high speed toward the left, an arm 6| on a, rod 62 secured to and, movable with the ram 28 opens a normally closed limit switch 63 (Figs. 1, 2, and 4) which deenergizes horizontal in advance solenoid 45 to shut off the low pressure, high volume oil to the horizontal cylinder 30 and permit the. ram 28 to con.- tinue to advance at slow or pressing speed under high pressure, low volume. oil from the pump 31. The ram 28 moves to in. position, toward they left until the die parts 24 and 26 are closed when .4 another arm 64 fixed to the moving rod 62 operates a limit switch 65 which connects power to effect operation of the vertical ram I1. Another limit switch 66 operated by an arm 61 on the rod 62 controls the in travel of the horizontal ram 28.v toward the left and limit switch 5.8 operated by the arm 51 controls the on movement of the ram 28 to the right to prevent damage to the press.

In controlling the movement of the vertical ram |,-8, electrical power is applied to energize a vertical down in advance solenoid 10 (Figs. 2 and 3 which operates. its pilot valve H. Actuation oi the, pilot.- valve closes its exhaust line 2 to oil reservoir 35 and causes oil under pressure to flow from pressure pump 35 through pipe 13, pilot valve 'l-I; pipe 14, to valve 4| to cause operation thereof. This actuation of valve 4| admits low pressure, high volume oil from pump 39 through pipe 5.0, through valve 5i and pipes IS-J6 into the top of the vertical cylinder [iii A. moment later vertical down solenoid 'I-TKiFi'gs. 2' and 3') is energized to actuate valve 43. This operation of valve 43 also admits high. pressure. low volume oil into the. top of cylinder Hi. from pump 36 through pipe 8|, valve 43,. pipes 82 and 16.

The low pressure, high. volume oil. flowing into the top of" cylinder 16 causes thepiston I"! and vertical ram it, to move down at fast speed until limit switch 83 is operated by an. arm 84 fixed to a. vertical rod 85, which is-secured tea-no; travels with the vertical ram Nil Actuation of limit switch 83 deenergizes vertical down in advance solenoid 10 thereby returning valve 4| to neutral position and stopping the flowof the low pressure, high volume oil through pipe T5. The ram 18 continues downward under the influence of the high pressure, low volume oil at pressing speed and applies pressure on the molding die 22' until a. timing device energizes a vertical up solenoid 8'3 to operate apilot' valve 39 which actuates the valve 43 to stop the flow of oil through pipes 82 and 16 and cause oil to flow through line all and foot valve 9| into the lower end of vertical cylinder IE to move the ram i8- upward. The foot valve 9| is inserted in the pipe line 90 to maintain su-fll'c-ient pressure under the vertical piston I! to prevent the ram l8 from dropping under its own-weight when the hydraulic system is not in operation.

The founway valve 43 is so constructed that upon providing communication between pipe lines 82 and 15 to move the ram; 8 downward, CQl'li=- muni'cation is also established with the inner lower end of cylinder It by the foot valve el and the pipeline 96 so as to allow the fluid below the piston IT to exhaust to the reservoir 35. Also when the pilot valve 89 actuates the valve 43 to move the ram l8 upward, the valve 43 also provides communication therethrough between pipes 16, 82 and exhaust pipe 59 to permit the fluid above the piston H to exhaust to the reservoir 35.

A limit switch 92 is, provided in the path of travel of) the vertical ram to limit its downward movement and is operated by an arm 53 secured toflthe ver ical arm which moves with the vertical ram, l8... Another limit, switeh 94 limits the upward. movementv of the vertical ram l8 and. islikewiseoperated by the 93.

- A horizontal out? solenoid 9.5, is then actuated to: operate its pilot valve 96 which operates valve 42. to stop the flow. of oil through pipe 58 and cause: oil, to. flow through the pipe 60 into. the left hand. end of, horizontal cylinder 30 to move the 5. ram- 28 to its "out or righ t'handnormal position when the press is ready for reloading and the next cycle. This operation of the valve 42 by the pilot valve 96,- not only shuts ofi the flow of oil from pipe 51 to pipe 58 but also connects pipe 58 with exhaust pipe 59 so that the oil on the right side of the piston 29 can exhaust to the reservoir 35. l I Press controls The above described hydraulic functions of the press are controlled by the electrical system shown in Figs. 3. 4, and 5. There are two conditions to be satisfied in operating the press under different conditions; namely, hand and automatic cycling operations, these operations-being so interlocked that they cannotbe: operated simultaneously. Hand operation involves moving either ram in either direction at slow speed as long-as a contact button for the function desired is held depressed and so interlocked that only one functioncan be accomplished at a time.

Automatic cycling operation must satisfy four conditions; angle molding, with or, without breathing, involving both horizontal and vertical rams, and standard vertical molding with or without breathing and the horizontal ram inactive.

Automatic cycling under the first condition with the breathing function involves the following sequence of operations: depressing a button causes the horizontal ramto move in at fast speed to a predetermined point where the speed is reduced and the die is closed to set up controls for operation of the vertical ram. Depressing a sec-.

.ond button causes the vertical ram to move down at fast speed to a predetermined point where 'speed'is reduced and the die closes at slow speed. Pressure is built up in the mold to the desired degree. The vertical ram then reverses and moves up a short distance, sufiicient to allow the mold to breathe. The vertical ram reverses again and moves down to apply molding pressure until the end of the cure. The ram then moves up to the end of its upward travel and the horizontal ram opens the die by returning to its outward limit, and the cycle is completed.

The same cycle without breathing involves the selective omission of the short upward movement of the vertical ram.

Standard operation with vertical ram only involves selective operation as above for breathing, and a positive lock out of the horizontal ram function.

The electrical control system and operation of the press Assuming that the press is in its open or normal position as shown in Figs. 1 and 2, the closing of a main switch I (Fig. 3) energizes a relay IOI which closes its contacts I02I06 to a 440 volt A. 0. power supply, indicated at I01. The closing of the contacts II06 establishes an energizing circuit through the primarywinding I08 of a step down transformer I09. A secondary winding IIO of the transformer supplies 110 volt A. C. power to lines III and H2 (Figs. 3 and 4). A conductor II3 connected across the power lines. III and II2 lights a green pilot lamp I I4 to indicate that the transformer is delivering power. Closure of switch II5 (Figs. 1 and 3) turns on a plurality of machine lights II6 through a conductor II1 to provide proper-vision for the operator.

The operator then momentarily presses a start button I I8 (Figs. 1 and 4) to on position to energize a main motor relay II9 through a circuit one of the relays I51, I58 or from power line III through the closed contacts of the start button I I8, conductor I2 I, the winding of relay H9, conductor I22 back to powerline II2. Also a pilot light I20 is lighted from power line I I I through the closed contacts of start button II8, conductor I2I, conductor I23, through the pilot light I20 back to powerline II2. Operation of the relay I I9 closes its contacts I24 (Fig. 3) to eflect operation of the double end main pump motor 39 (Figs. 2 and 3) from the source of power I01 through closed contacts I02I04 and conductors I26. I21 and I28. The main motor relay I I9 is maintained energized through its own interlock contact I29 and conductor I30.

Manual control Hand control only is possible at this point since the power lines I I I-I I2 from the transformer I09 are broken at open contacts I3I-I32 (Fig.

4). To obtain hand control of the press, a hand line I I 2. This red light indicates that the press is now set up for hand control. At the same time, automatic operation of the press is rendered inipossible by the opening of top contacts I48 or switch I33 when it was depressed to set up hand .control. If it is desired to move the horizontal ram 28 to the in or left position under hand control, the operator depresses button switch I52 (Fig. 4) and holds it closed whereupon a circuit is established from power line I I I through contacts I46 of locked switch I33, normally closed contacts I30 of cycle control relay I4I, normally closed contacts I39 of vertical control relay I42, closed limit switch 66. closed contacts of manually operated button switch I52, through the winding or inch horizontal in" relay I53 (Fig. 4) normally closed contacts I54, I55 and I56 of inch horizontal out relay I51, inch vertical down relay I58 and inch vertical up relay I59, respectively, then through ponductor I34 to power line II2. Energization of relay I53 closes its normally open contacts I60 (Fig. 3) to operate horizontal in solenoid 52 from power line I28, conductors I64--I65, through the winding of horizontal in solenoid 52, closed contacts I60, conductors I6IiI61 back to power line .126. Operation of the solenoid 52 (Figs. 2 and 3) efieots the in slow or inch operation of the ram 28 to the left. Release of pressure on the button I 52 by the operator immediately interrupts the function and horizontal ram 28 can be stopped in any position. Likewise the operation of horizontal out button switch I10, and vertical up button "I (Figs. 1 and. 4) or a vertical down button I12 will establish a particular circuit to energize a desired I59 to close contacts -I6I, I62 or I63 in Fig. 3 to operate a desired one of a plurality of solenoids 95, 11 or 8B which operate the horizontal or vertical rams in the manner hereinbefore described for the hydraulic system.

The relays I53, I51, I 58 and I59 are interlocked in a conventional manner as shown in Fig. 4 so The limit switches 66 and 92 To. obtain automatic operation of the press with breathing of the molding die 22, the horizontal ram 28 must be. completely withdrawn to its out or right position so that contact I83 of limit switch 68 is closed before the start of operations. Also the vertical ram I8 must be in'its full opposition to operate switch 94. With this presetting f the press and the hand control switch in the off position, the operator then closes cycle lock button switch I80 (Figs. 1 and 4) which energizes the cycle control relay I4! from power line. III through. closed contacts of an emergency switch I8I, the lower closed. contacts I82 of operated lock switch I80, a normally closed contact I83 of limit switch 63, the wind.- lng of relay I4I, closed contact I84 of the unoperated horizontal control relay I49, and conductor I85 to power line II2. relay. [H is maintained energized through a looking circuit from the power line II2 through conductor I85, closed contact I84, the winding of relay I4I, back through its now closed contact I88, conductor I19, closed contacts of emergency switch I8I to power line III. Energization of the cycle control relay I4I opens its contact I38 and renders the hand control inoperative and closes contacts I3l and I32 to connect power to lines I81-I88 of the automatic control circuits oi Figs. 4 and 5'. The operation of relay I4I also closes its contact I89 to connect power to circuits for controlling the horizontal and vertical cycling or the horizontal and vertical rams of the press. The establishment of power to lines I81 and I88 lights. a green lamp I90 through conductor I9I, which green light indicates that power is established for automatic operation.

The cycle lock switch I80 is returned to of! position. The operator then momentarily dcpresses horizontal ram control button switch I92 (Figs. 1 and 4), toenergize the horizontal in advance relay I93 (Fig. 4.) from power line III, through closed contacts I48 of unoperated hand control switch I33, upper closed contacts I94 of cycle lock switch I80, closed contacts I89 of cycle control relay I4I, conductor I95, closed contacts of operated horizontal controlswitch I92, normally closed contacts I96, I91 and I98 of unoperated vertical control relay I42, horizontal out relay I99, and vertical down relay 290, the winding of relay I93, through a normally closed contact 20I of unoperated vertical up relay 202 (Fig. 5), conductor 203 to power line I88. The relay I93 is maintained energized through a lock up circuit from power line I81 through normally closed limit switch 63, conductor 204, now closed contacts 205 of the energized relay I93, the winding of relay I93, closed. contact 20-I, conductor 203 to. power line I88. A normally open contact 2.06 on relay I93 closes therebyenergizing the fill motor relay 201 from power line I81 through conductor 208, closed contact 206, conductor 209, the winding of relay 201, the closed contact 2I0 of. previously energized main motor relay M9 to power line I88. The fill motor relay 201 is maintained energized through a locking circuit. from power line I88, through closed contact 2I0, the winding of relay 201, closed contact 2 II of energized relay 201, conductor 2I2, the normally closed contact of limit switch 83 to power line I81.

Operated relay 201 closes its contacts 2I3 (Fig.

Cycle control a I 3) to connect power to fill pump motor from source of power I01 through closed contacts I02-I04, conductors I26-I2B, conductors 2I4, closed contacts 2I3, to motor 40 which operates high volume oil pump 39 (Fig. 2).

Energized relay I93 also closes its contact 2I5 (Fig. 3) thereby energizing the solenoid of the horizontal in advance pilot valve 46 (Fig. 2) from power line I26 through conductors I61-I 66, closed contact 2I5 through the winding of solenoid 43 and conductor I64 to power line I28.

Also the operation of relay I93 closes its normally open contact 2I6; and energizes the horizontal in relay 2 I1 from power line I81 through a normally closed contact 2I8 of vertical switch 2 l9, conductor 220, closed contact 2I6, the winding of relay 2I1, conductor 22I to power line I88. Relay 2'" is maintained energized through a locking circuit from power line I81, through closed contact 2 I8, conductor 220, c0nductor'222', closed contact 229 of energized relay 2I.1,normally closed contact 224'; conductor 225, closed contact 226 of energized relay 201, conductors 221-228, the winding of relay 2 I 1, conductor 22| to power line I88.

Energized horizontal in relay 2I1 closes its contact 230 (Fig. 3) thereby energizing the sole"- noid 52 of the horizontal in pilot valve 53 (Fig. 2) from the power line I28, conductors I64-.I65,

the winding of solenoid 52, closed contact 230,

conductor I61 to power line I26.

This dual energizatlon of solenoids 45' and 82 (Fig. 2) operates the pilot valves 46 and 53 respectively, which in turn operate the valves H and 42 to admit low pressure, high volume oil from pump 39 and high pressure, low volume oil 7 from pump 31, respectively, to the right end of cylinder 30 through pipe lines as hereinbefore described for the hydraulic. system to movethe piston 29 and the horizontal. ram 28 tothe left or in position. at fast speed.

The horizontal ram 28 moves forward on fast advance under the combined efiect of the high volume delivery of the pump 39 and the low volume delivery of the'pump 31 until limit switch 63 is operated by the arm 6I movable with the ram 28, whereupon. switch 63 opens the locking circuit through the horizontal inadvance relay I93. Relay I93 deenergizes and opens its. contact 2 I 5 (Fig. 3) to deenergize, the solenoid 45 of the pilot valve 46 to permit. the valve 4 I to return to neutral position thereby shutting off the high volume delivery of the pump 39 to operate horizontal ram 28.;

The horizontal ram 28 continues to advance. at slow or pressing speed under the effect of the high pressure, low volume delivery of pump 31 until the die parts 24, 26 are closed when limit switch is closed by arm 64 (Fig. 2). The closing of limit switch 65 energizes a vertical lock out relay 23I (Fig. 4) from power line I81 through the winding of relay 23I, closed limit switch 65, conductors 232-233 to power line I88. Relay 23I operates and closes its contact 234 (Fig. 5).

With horizontal in relay 2 I1 still energized to maintain energization of solenoid 52 of pilot valve 53 which'thus keeps valve 42 in position to continue to supply oil under pressure to the right side of; piston. 29 to maintain the horizontal ram 23 in in position to keep the die parts 24-26 closed. At this. point molding material is introduced into the die and the operator momentarily depresses a cycle vertical button switch 235 (Figs. 1 and 5) which establishes an energizing circuit for a vertical down advance relay 236: (Fig. 5) from power line- III through normally closed up- .per contacts I48 (Fig. 4) of unoperated hand control switch I33, through normally closed upper contacts I94 oi unoperated cycle lock switch I80, closed contacts I 89 of energized cycle control relay I4I, conductor I95, conductor 231, closed contacts 234 of energized relay 23I, upper closed contacts 229 of closed button switch 235, conductor 238, the winding of vertical down advance relay 236, normally closed contact 238 of unoperated vertical up relay 202, conductor 240 to power line I88. The vertical down advance relay 236 is maintained energized through a locking circuit from power line I88, conductor 240, closed contact 239, the winding of relay 236, conductor 24I, closed contact 242 of energized relay 2%, conductor 243 through closed limit switch '83 to power line I81.

Energized relay 236 closes its contact 246 thereby energizing solenoid 10 of the vertical down advance pilot valve N (Fig. 2) from power line .I26 (Fig. 3) through conductors I61I66, contact 246, ,.the winding of solenoid I0, conductor I64 to power line I28. 9

Another contact 245 (Fig. of energized relay 236 is opened to prevent false up operation of vertical ram I8.

The momentary closing of the vertical cycle switch 235 also closes a circuit through the previously closed contact 234 of energized relay 23I to operate a timer 241 from power line I I I through upper closed contacts I48 of unoperated hand lock switch I33, the upper closed contacts I94 of unoperated cycle lock switch I80, closed contact I89, conductors I95, 231,v closed contacts 234 of operated vertical lock out .relay 23I, closed contacts 244 of closed switch 235, normally closed contact 248 of an unoperated breathing out relay 258 (Fig. 5), conductor 25l, the winding of the timer 241, conductors'252 and 253 to power line I88. The energization of the timer 241 effects the closing of its contacts 254 to create a locking cir- 'cuit therefore from power line I I I through closed contacts I48 of switch I33, closed contacts I94 of switch I80, closed contact I89, conductors I85, 231, closed contact 234, through conductors 25Ii- 256, closed contacts 254, the Winding of timer 241, conductors 252-453 to power line I88.

Energization of the timer 241 also closes its 'contact 251 to energize the vertical down relay 208 (Fig. 5) from power line III, through closed contacts I48 of hand lock switch I33, upper closed contacts I94 of cycle lock switch I80, closed contact I89, conductors I95, 231, closed contact 234.

conductors 255, 258 and 259, closed contact 251,

the winding of vertical down relay 200, the normally closed contacts 288 of unoperated vertical up relay 202, conductor 26I, to power line I88. Another contact 262 of operated timer 241 is opened to prevent operation of a timer 263 and false up operation of vertical ram I8.

Energized vertical down relay 280 closes its contact 264 (Fig. 3) thereby energizing down solenoid 11 to operatevertical down pilot valve 18 (Fig. 2) from power line I28 through conductor I64, the winding of down solenoid 11, closed cont-act264,

conductors I66-I8'I to power line I2 6.

This dual energization of down solenoids 10 and 11 operates pilot valves H and 18 (Fig. 2), respectively, which in turn operate the valves M and 43 to send oil under pressure through pipes 15 and 82 into pipe 16 to the upper end of vertical cylinder I6 to move the vertical'ram I8 downward atfast speed. The ram I8 continues to move down at fast advance speed under the combined effect of the high volume delivery of down advance relay 236 by opening the locking circuit. Contact 246 (Fig. 3) of deenergized relay 236 then opens to deenergize vertical down advance solenoid 18 to permit valve 4| (Fig. 2) to return to neutral position thereby shutting oil the .high volume delivery of the pump 38.

The operation of limit switch 83 also opens the locking circuit to fill motor relay 281 which deenergizes and opens its contacts 2I3 (Fig. 3) to stop the operation of fill pump motor 40.

With the vertical down relay 200 still energized to maintain contact 264 (Fig. 3) closed and down solenoid 11 energized, pilot valve 18 remains operated to keep valve .43 in position to continue to supply oil under pressure to the upper side of vertical piston I1. Thus vertical ram I8 continues down at pressing speed under the influenc of the high pressure, low volume oil ofpump 36 until die part 2| cooperates with closed die parts 24, 26 to apply pressure on the molding material. Molding pressure is continued until the timer 241 times out after a, predetermined interval. In the meantime, the operated vertical down relay 280 has closed its contact 261 to energize a' control relay 268 from power conductor I95 through conductor 231, closed contact 234, conductor 255, conductor 258, conductor 269, closed contact 210 of limit switch 94 (Figs. 2 and 5), conductors 21l- 215, closed contact 261, the winding of control relay 2468, conductor 213 to power line I88.

A locking circuit for control relay 268 is created from power line I88 through conductor 213, the winding of relay 268, its now closed contact 214, conductors 215, 216 and 21I, normally closed contact 210 of up limit switch 94 (Figs. 2 and 5), conductors 269, 258 and 255, closed contact 234 of the vertical lock out relay 23I, conductors 231 and I95, closed contact I 88 of the cycle control relay I4I, the upper closed contacts I94 of the cycle lock switch I80, through the upper closed contacts I48 of hand lock switch I33 to power line III. The energization of control relay 268 also closes its contacts 211, 218.

The operation of relay 268 also closes its contact 219 (Fig. 4) to maintain horizontal in relay 2I1 energized through a locking circuit from power line I 88 through the conductor 22I, the winding of relay 2II, conductor 228, conductor 280, the closed contact 219, conductor 28I, con- -ductors 222, 220, the closed contact 2I8 of vertical switch 2I9 to power line I81.

Thus through the continued energization of horizontal in relay 2I1, the horizontal ram is maintained in ,in position to keep the die parts 24, 26 closed until control relay 268 is deenergized.

After'a predetermined interval, the timer 241 times out and opens its locking circuit through its contact 254 to deenergize its winding. Also 'contact 251 of timer 241 is opened to deenergize vertical down relay 200 which in turn opens its contact 264 to deenergize solenoid 11 (Fig. 3)

to return valve 43 to neutral position and shut off the flow of high pressure oil into the upper end of vertical hydraulic cylinder I8 to release vertical 'ram I8.

At this point the winding of another timing mechanism 263 is energized from power line I88 through conductors 284285, the winding of timer 263, conductors 286281, a normally closedcontact 288 of an unoperated control relay 289, closed contact 218 of energized control relay 268, normally closed contacts 262 and 298 locking circuit frompower line I88 over conductors 284-285, through the winding of timer 263, its closed contact 293, conductors 294, 295, 29I, 292, 258, 255, closed'contact 234, conductors 231, I95, closed contact I89, upper closed contacts I94 of cycle lock switch I80, upper contacts I48 of hand lock switch I33 to power line III.

Timer 263 starts timing and closes its contact 296 to energize vertical up relay 282 (Fig. from power line I88 through conductor 291, the winding of relay 282, closed contact 296 of operated timer 263, normally closed contacts 298 and 245 of unoperated vertical down relay 280 and vertical down in advance relay 236, respectively, through conductors 380, 38I, 216, '21I, closed contact 210 of up limit switch 94, conductors 269, 258, 255, closed contact 234 of energized vertical lock out relay 23I, conductors 231, I95, closed contact I89 of energized cycle control relay I4l, upper closed'contacts I94 of unoperated cycle lock switch I80, closed contacts I48 of hand lock switch I33 to power line III. The energization of vertical up'relay 282 closes its contact 302 (Fig. 3) which energizes solenoid 88 to operate pilot valve 89 (Fig. 2)

which operates valve 43 to admit oil under pressure from pump 36 through pipe SI, valve 43, through pipe 98, and foot valve 9| into the lower end of vertical cylinder I6 to move the piston I1 and vertical ram I8 upward. The die part 2I (Fig. l) is thus moved upward to open the die 22 to permit breathing whereby any trapped air or gas in the mold may escape.

The energization of vertical up relay 282 also closes its contact 383 to operate the control relay 289 from power line I88 through conductor 384, the winding of relay 289, closed contact 383 of energized relay 282, conductors 305-396, closed contact 211 of energized control relay 268, conductor 301 to power line I81. control relay 299 closes its contact 308to establish a locki g circuit from power line I88 through conductor 304, the winding of relay 289, closed contact 388, conductors 309, 3I8, 386, closed contact 211, conductor 381 to power line I81. Energized control relay 289 also opens its contact 288 and closes its contacts 3I I and 3I2.

After a predetermined interval when timer 263 times out, contact 296 is opened to deenergize vertical up relay 282, which opens contact 382' (Fig. 3) to deenergize up solenoid 88 which permits valve 43 (Fig. 2) to return to neutral position and stop the flow of oil through pipe 98 and thus discontinue the upward movement of vertical ram I8. Also,'when timer 263 times out, a circuit through another timing mechanism 3I3 is completed from power line I88, through a conductor 3I4, winding of timer 3I3, conductor 3l5, normally closed contact 3I6 of an unoperated control relay 3I1, closed contact 3I2 of en.- ergized control relay 289, normally closed ,contact 3I8 of deenergized timer 263, conductors 3I9, 328, I, 216, 211, closed contact 218 of up limit switch 94, conductors 269, 258, 255 closed contact 234' of energized vertical lock out relay The operation of ace-7:113

' also closes 12 23I, conductors 231, I95, closed contact I89, upper closed'contact I94 of cycle lock switch I88 and-closed contacts I48 of hand lock switch I33 to pcwer'line III.

A locking circuit to maintain the timer 3I3 energized is established from power line I through conductor 3, the winding of timer 3I3, its closed contact 32I, conductors 322, 295, 29I, 292, 258, 255, closed contact 234 of energized vertical lock out relay 23I, conductors 231, I95, closed contact I89, upper closed contacts I94 of cycle lock switch I60, closed contacts I49 of hand lock switch I33 to power line III.

The operation of timer 3I3 closes its contact 323 which sets up a circuit to energize vertical down relay 208 from power line I88 through conductor 26I, normally closed contact 268 of unoperated vertical up relay 282, the winding of vertical down relay 288, conductor 324, closed contact 323, conductors 325, 292, 258, 255, closed contact 234 of energized vertical lock out relay 23I, conductors 231, I95, closed contact I89, upper contacts I94 of cycle lock switch I80, closed contacts I48 01'' hand lock switch I33 to power line III.

Operated vertical down relay 288 closes its contact 338 which establishes a circuit from power line I88 through conductor 33I, the winding of control relay 3I1, previously closed contact 3I I of energized relay 239, conductor 332, closed contact 338 of relay 208, conductors 333, 324, 3I0, 386, closed contact 211 of energized control relay 268, conductor 381 to power line I81. Control relay 3I1 establishes a locking circuit from power line I86 through conductor 33I, the winding of relay 351, conductor 335, closed contact 336 of energized relay 3I1, conductors 331, 338, 334, 3"), 306, closed contact 211 of energized control relay 268,

conductor 381 to power line I81.

Operation of vertical down relay 288 (Fig. 5) its contact 264 (Fig. 3) to energized down solenoid 11 which operates its pilot valve 18 (Fig. 2) to operate valve 43 thereby causing oil under pressure to flow through pipes 82, 16 into the upper end of vertical cylinder [6. Ram I8 then moves down to apply pressure to the molding die 22 until the end of the cure of the -molded article as determined by the timin mechanism 3I3.

At the end of the cure of the molded article in the molding die, the timer 3I3 times out thereby opening contact 323 to deenergize the vertical down relay 280 and stop the flow of oil under pressure into the upper portion of vertical cylin-' der I6. Timer 3 I 3 in becoming deenergized closes its contact 339 to establish an energizing circuit for vertical up relay 282 from power line I88 through conductor 291, the winding of relay 202, conductor 348,. closed contact 34I of energized control relay 3I1, normally closed contact 339 of deenergized timer 3I3, conductors 3,42, 325, 292, 258, 255, closed contact 23.4, conductors 231, I95, closed contact I89, upper closed contacts I94 of cyclelock switch I88, upper closed contacts I48 of hand lock switch. I33 to power line I I I.

Energization of vertical up relay 282 effects the closing of its contact 302 (Fig. 3) which energizes'up solenoid 88 (Fig. 2) to operate pilot valve 89. This pilot valve operates valve 43 to cause :oil under pressure to flow through pipe 98 and past valve 9I into the lower end. of cylinder I6 to normally closed contact 219 (Fig. connected deenergization of relay 2I1 opens its contact 239 (Fig. 3) to deenergize solenoid 52 (Fig. 2) to close pilot valve 53 which returns valve 42 to neutral position and thus shuts off the high pressure oil through pipe 58 into the horizontal cylinder 39 thereby removing pressure on the right hand side of horizontal piston 29.

Also the operation of up limit switch 94 closes its normally open contact 343 (Fig. 4) to establish a circuit from power line I81 through closed contacts 343, closed contact 344 of out limit switch 68, conductor 345, the winding of horizontal out relay I99, normally closed contact 346 of unoperated horizontal in advance relay I93, normally closed contacts 341 of unoperated horizontal in relay 2I1, conductor 348 to power line I89. The energization of horizontal out relay I99 closes its contact 359 (Fig. 3) to energize out solenoid 95 to actuate its pilot valve 96 (Fig. 2) to operate valve 42 which causes oil under pressure to flow from pump 31 through pipe 51, valve 42 and pipe 69 into the left end of horizontal cylinder 39 to move the piston 29 and horizontal ram .28 to the right toward out" position until arm 6| (Fig. 2) on rod 62 traveling with the horizontal ram 28 operates the out limit switch 68 when movement stops with die 22 fully opened to permit removal of the molded article or mounting strip 23 (Fig. 6) therefrom.

The operation of limit switch 69 (Fig. 4) opens its normally closed contact 344 to open the energizing circuit to the horizontal out relay I99. The deenergization of relay I99 opens its contact 359 (Fig. 3) to deenergize out solenoid 95 (Fig. 2) to close pilot valve 96 which allows valve 42 to return to neutral. Valve 42 thus shutsofl the oil under pressure through pipe 69 (Fig. 2) to stop the movement of the horizontal ram 28 in its outermost position to the right. The die 22 is then open and ready to be put through another cycle of pressing, breathing and repressing for predetermined intervals as controlled by the hydraulic, electrical and timing mechanisms as hereinbei'ore described.

Automatic cycling operation without breathing gizing circuits to timers 241 and 263 thereby rendering them non-operative. Relay 259 also closes its contacts 352, 353, which condition circuits to energize control relay 3" and timer 3I3, respectively, at the proper times.

With the breathing selector switch 35I closed to out position to eliminate the breathing cycle,

14 I96 whereupon the switch I89 is released to return to normal position to close its upper contacts I94. The operation of the cycle control relay I4I renders hand control non-operative and closes contacts I 3I-I32 to connect power to lines I91 and I89 which lines are connected to the automatic control circuits of Figs. 4 and 5.

The operator then closes horizontal control switch I92 to control the horizontal ram by energizing the horizontal in advance relay I93 which is maintained energized through its own interlocked contacts 295. The operation of the relay I93 energizes the fill motor relay 291 and horizontal in relay 2| 1.

The operation of relays I93 and 2I1 controls the operation of contacts 2I5 and 239 (Fig. 3) to energize horizontal in solenoids 45 and 52, which in turn controls hydraulic valves 4| and 42 (Fig. 2) as vhereinbefore described to admit oil, under pressure, into the right end of horizontal cylinder 39 to move the horizontal ram 29 toward the left to in position. The horizontal ram as it closes, the die parts 24, 26 operates limit switch 63 to open the energizing circuit for relay I 93 which opens contact 2I5 to deenergize solenoid 45 to'return hydraulic'valve 4| to non-operative neutral position but permits valve 42 to continue to apply oil under pressure to the right end of the horizontal piston 29 to keep die parts 24, 26 closed. The horizontal ram also operates limit switch 65 which sets up an energizing circuit to actuate vertical lock out relay 23I and close its contact 234 to power.

The die is now closed, molding material is introduced, and the operator then closes vertical control switch 235 (Fig. 5) to efiect operation of vertical down advance relay 236, which is maintained energized by a locking circuit from power line I88 through conductor 249, normally closed contact 239, the winding of relay 236, conductor 24I, closed contact 242, conductor 243 through closed limit switch 83 (Figs. 2 and 4) to power line I91.

The operation of vertical down in advance relay 239 closes its contact 246 (Fig. 3) to energize down advance solenoid 19 which operates valve 4| (Fig. 2) to send oil under pressure through pipes 15, 16 into the upper end of cylinder I6 to move the vertical ram I8 downward.

The closure of vertical control switch 235 and the previous closure of contacts 353 by the enerthe operation of the press proceeds as hereinbefore described for automatic cycling operation. That is, briefly summarizing the prior operations, the operator momentarily closes cycle lock switch I89 (Figs. 1' and 4) to energize the cycle control relay I4I which establishes and maintains an energizing circuit through its own interlock contact gized breathing out relay 259 establishes a circuit from power line I 88 through conductor 3I4, the winding of timer 3I3, conductor 354, closed contact 353, conductor 355, closed contacts 244 of switch 235, closed contacts 234 of operated vertical lock out relay 23I, conductors 231, I95, closed contact I89, upper closed contacts I94 of cycle lock switch I99, closed contacts N8 of unoperated hand lock switch I33 to power line II I. Timer 3I3 is thus energized to close its contacts 32I and 323, and also opens its contact 339 (Fig. 5). I

The timer 3I3 is maintained energized through the closure of its contact 32I by a locking circuit from power line I89 through conductor 3I4, the winding-of time 3I3, its closed contact 32I, conductors 322, 295, 29I, 292, 258, 255, closed contact 234 of energized vertical lock out relay 23I, conductors 231, I95, closed contact I89, upper closed contacts I94 of cycle lock switch I99, up-

per closed contacts I48 of hand lock switch I33 to power line III.

Thevertical down relay 299 is also energized 15 to assist in the downward movement of ram I8 by a circuit from power line I88 through conductor 26I, normally closed contact 268 of deenergized vertical up relay 282, the winding of vertical down relay 288, conductor 324, closed contact 323 of energized timer 3I3, conductors 325, 282, 258, 255, closed contact 234 of energized relay 23I, conductors 231, I95, closed contact I88, upper closed contacts I84 of cycle lock switch I88, upper closed contacts I48 of hand lock switch I33 to power line III.

Vertical down relay 288 thus operates and closes its contact 284 (Fig. 3) to energize the down solenoid 11 which operates pilot valve 18 and valve 43 to send high pressure, low volume oil through pipes 82, 16 into the upper end of cylinder I6 to assist in the downward movement of vertical ram IS.

The dual operation of down solenoids 18 and .11 continues to control the downward movement of vertical ram I8 until the arm 84 on the rod 85 moving with the ram operates limit switch 83 to open the previously described locking circuit through conductor 243, contact 242, conductor 24I and deenergize the vertical down advance relay 235, which then opens its contact 248 (Fig. 3) :to deenergize solenoid 18. The vertical down relay 288 is continued energized to maintain solenoid 11 operated to apply molding pressure to the die through ram I8 until the timer 3I3 times out when its contact 323 is opened to deenergize the vertical down relay 288 which then opens contact 264 to deenergize solenoid 11 and release downward pressure on the vertical ram I8.

The energization of vertical down relay 288 7 closed its contact 281 to establish a circuit from power line I88 through conductor 213, the winding of control relay 258, the closed contact 261 of energized relay 288, conductors 212, 21 I closed contact 218 of limit switch 84, conductors 288, 258, 255, closed contact 234, conductors 231, I85, closed contacts I89, I84, I48 to power line III. Control relay 288 operates and closes its contacts 219, 214, 211, 218, and opens its contact 224 (Fig. 4).

A locking circuit for energized relay 288 is established from power line I88 through conductor 213, the winding of relay 368, its closed contact 214, conductors 215, 216, 2"l-I, closed contact 218 of limit switch 84, conductors 289,. 258, 255, closed contact 234, conductors 231., I95, closed contact I88, closed contacts I84 of cycle lock switch I38, closed contacts I48 of hand lock switch I33 to power line I I I.

Th closing of contact 211 by the operation of relay 288 establishes a circuit from power line I81 through conductor 381, closed contact 211, conductors 386, 3I8, 334, 338, 358', closed contact 352 of energized breathing out relay 258, conductors 358, 335, the winding of control relay 3I1, conductor 33I to power line I88. Control relay 3I1 operates to close its contacts MI, 336

and open its contact 3T8.

The closing of contact 34I establishes an energizing circuit for vertical up relay 282. from pow- I er line I88 through conductor 28?, the winding of relay 282, conductor 348, closed contact 341, normally closed contact 339 of" unopera'ted' timer 313 which has timed out, through conductors 342, 325, 282, 258 25 closed contact 234-, conductors 231, I85, closed contact I88, closed contacts I84 or cycle lockswitch' I 88, closed contacts I48- of hand lock switch I 33 to power line III.

. -The enereizatiorr cit up relay 282 (Fig. 5)

c 382 to power" line I I2..

16 Y causes the closing of its contact 382 (Fi 3) t5 energize u'p iiol'eneid 88 which operates pilot valve 88 (Fig. 2) and valve 43 to cause oil under pressure topass through pipe 98 and foot valve 9| into thelower end of cylinder I6 to move vertical ram I8 and die part 2I upward to open the die 22. r

When the vertical ram I8 reache its u per limit switch 84 is operated to open contact 218 (Fig. 5) and deencrgize up relay 282 which opens its contact 382 (Fig. 3) to deenergiz'e up solenoid 88. The deenergization of solenoid 88 closes pilot valve 88 (Fig. 2) to permit valve 43 to return toheutral position to shut off the oil through pipe 88 and stop the movement of ram I8 in its uppermost osition. The operation of the cycle then proceeds to move the horizontal ram to fo'ut position, thus opening the die io'r removal of the molded article and the press is now ready for another operating cycle.

Cycling 01 vertical ram only To obtain operation of the vertical ram I8 without operating the horizontal rain 28, the operator turns the vertical switch 2I8' (Fig. 4) to on position to open its. contact 218 and close its contact 368. The op ng fif' 001111511313 2 I9 ifi ders horizontal in relay 2I1 non-operative for the horizontal ram 28. The closing of contact 358 establishes an energizing circuit for vertical control relay I42 nonipower line III through 010886. Contact 3'68, the Winding of relay I42, normally closedinterlockiri'g contact 381 of unoper'ate'd horizontal control relay I43, conductor Vertical control may I42 operates and opens its interlocking contact I38, 383, I to render both hand and automatic controls noneoperative for the horizontal ram 2's so that it cannotb'e operated. Relay I42 also closes its contacts 364 and 365. The closure of contact 385" by passe's open limit switch. 85' to energize vertical lock out relay 231 from power line I81 through the winding of relay 23I, conductor 386, closed cdntact' 385', conductor 233' to power line I88. Cycle vertical switch 235 is then closed momentarily to energize vertical down advance raayzse which closes its contact 368 (Fig. 4) to establish an energizing circuit for the fill motor relay 2818mm power l'i'r're1 I8I through closed limit switch 83, conductor 381, closed contact 384 of relay 842, closed contact 3158 or elicigized vertical down advance relay 238, conductors 368, 289, the winding offi-llarnotor relay 281, the closed contact 218 of energized mainrnotor relay H8 '00 power line I88. Relay 281" then closes its contact 213 (Fig. 3) to efiect operation of pum motor 48 and high volume, low pressure pump 39. Y

E nergizationof vertical; downadvance relay 23 3 closes its contact 246' (Fig. 3-) to energize down advance solenoid 1:8 Solenoid 18 then operates pilot: valve 'I I (Fig.- 2) to actuate valve 4I= which causes oilunder pressure to pass through pipes 15, 16: into the upper end-divertical cylinder I8 to: move piston IT and vertical ram IB dOWnWaTd.

Thus with theclosing of vertical switch 218 and cycle verticalswitch. 235,. automatic cycling of the vertical. rami I8 can be had either with orwithout :b'reathi'ng',v depending upon] the position of the? breathing se1'e'ction switch-35I (Fig,

59:}. The sequelica of operations then occurs as Operation of horizontal ram only In setting up the machine withmolding dies it is often desirable as a protective measure to render the vertical ram non-operative when the horizontal ram is being manually controlled. When it is desired to operate only the horizontal ram under manual control, a horizontal switch 310 (Fig. 4) is closedv to energize the horizontal control relay.l43 fromgpower line III through closed horizontal switch 310, conductor 3', closed contact 363 of unoperated vertical control relay I42, the Winding of relay I43, conductor 312 to power line H2. The horizontal control relay I43, operates and opens its interlocking contacts I40, I84 and 3EI to render inch vertical down relay I58, inch vertical uprelay I59, cycle control relay MI and vertical control relay I42 non-operative. Thus upon the closures of horizontal switch 310 and of hand lock switch I33 the horizontal ram 28 can be manually controlled in its movement by the selective operation of button switches I52 or I10, while at the same time rendering it impossible to move vertical ram I8 because of the opening of the above described interlocking contacts I40, I84 and 36I.

Emergency stop The molding press is equipped with an emergency switch I8I (Figs. 1 and 4) whichwhen opened deenergizes cycle control relay MI. The deenergization ofrelay I 4I opens its interlocking contacts I86, I3I, I89 and I32 to render all control circuits ineffective and return all of the hydraulic valves 4|, 4 2 and 43 to neutral and thus stop the operation of both rams I8 and 28 immediately. The cycling control relay I 4| cannot be brought back into operation until cycle lock switch I8!) is again manually closed. The normally open contact I83 of out limit switch 68 also prevents operation of the cycle control relay I4I unlessthe horizontal ram 28 (Fig. 2) 'is all the way out to the right to close its contact I83.

It is to be understood that while the embodiment disclosed and described herein is a preferred one, the invention is susceptible to many different forms, and that other ln'strumentalities may be substituted for those disclosed, and that various changes and modifications may be made without departing from the spirit and scope of this invention as defined by the appended claims.

What is claimed is: v I

1. In a system for controlling hydraulic pressures, a first pump for delivering high volume low pressure fluid, a second pump for delivering high pressure low volume fluid, separate means for driving each of said pumps, a cylinder, a ram operated from the cylinder and controlled by the fluids from said'pumps, means for connecting both pumps to'the cylinder to moveth'e ram at fast speed, means for stopping the driving means for the first pump to move the ram at slow speed,'and an electrical circuit including a plurality of solenoids selectively controlled by the position of said ram for controlling the said plurality'of connecting means to movethe ram at selected intervals and'at predetermined speeds and. pressures.

2. In a hydraulic system for controlling the operation of a ram in a press, a prefill pump for operating the ram at high speed, a motor for operating the prefill pump, means for operating the ram at slow speed, and means for stopping the prefill pump motor upon the attaining of a predetermined condition so that only the means for operating the ram at slow speed is effective.

. driving the hydraulic power means, and an electrical circuit controlled by the position of each of said rams for rendering the driving means and the hydraulic power means selectively'effective singly and simultaneously to control the operation of the rams at predetermined speeds and at predetermined intervals.

4. In an angle molding press, a horizontal ram, a vertical ram, means for moving the horizontal 1 ram at high speed, means for moving the horizontal ram at slow speed, means for moving the vertical ram at high'speedymeans for moving the vertical ram atslow speed, pilot controlled directional valves for controlling all of said moving'means, means at a predetermined position in the path of movement'of each of the rams, for controlling said valves to render the high speed moving means ineffective and the slow speed moving means effective, and means at a second predetermined position in the path of movement of the rams for rendering the slow moving means ineffective after the ram has been moved slowly for a predetermined distance.

5. In an angle molding press, a horizontal ram, a vertical ram, a plurality of means for operating the horizontal and vertical rams, manual control means for controlling the operating means for each ram separately, control means for cycling the vertical ram independently of the operation of the horizontal ram, interconnecting means for rendering the manual control means-inoperative for said horizontal ram while the vertical cycling control means operates the vertical ram, automatic cycling control means for simultaneously controlling the operating means for both of the rams, and means for interlocking the manual control means and the automatic cycling means to permit the operation of only one of said control means at a time. w

6. In an angle molding. press, a horizontal ram, a vertical ram, means for, actuating the horizontal ram, a first control means for manually controlling said horizontal actuating meansto control the movement of the horizontalram, means for actuating the vertical ram, asecond control means for controlling the vertical actuating means to cycle the vertical ram independently of the horizontal ram, and selective means for rendering only one of said electrical circuits effective at one time so as to operate the rams independently of each other.

'7. In an angle'molding press, a horizontal ram, a vertical ram, a plurality of means for actuating each of the rams, an electrical system for controlling the actuating means including a first electrical circuit for manually controlling reciprocations of the horizontal ram, a second electrical circuit for automatically controlling reciprocations of the vertical ram in successive cycles, a plurality of interlocking switches selectivelyoperable in the electrical system for rendering only one of said electrical circuits effective at a time, and an emergency switch for rendering the interlocking switches, the electrical system and the ram actuating means ineffective.

'8. In a molding press, a ram, a first pump for moving the ram at fast speed to a predetermined point. a. second numn fnr mnvimz thn mm at slrmy 1.9 speed, :means at said predetermined point for rendering the fast moving pump ,ineffective and the slow moving pump effective for 'therram,

means at a second predetermined point in the movement of the ram for rendering the slowmoving pump ineffective after it has moved the ram a predetermined distance, "and means at a third predetermined point in the'movement of the ram stor limiting the retraction of the ram.

'9. In an angle molding press for operating a three-part molding die, a horizontal ram, a vertical ram, means for moving the horizontal ram to close two of the die parts, means for moving the vertical ram down to close the third die part with the othertwo closed die parts, means for controlling said moving means for the vertical ram so that the vertical ram applies pressure to "the'zdie for a first predetermined interval,'means ;for elevating said vertical rain at the end of said predetermined interval to permit the "die to breathe, timing means for maintaining said vertical ram in an elevated position for a second predetermined interval, and means to move said vertical ram down at the end of the second predetermined interval to again apply pressure to the die.

10. In an angle molding'press for operating a three-part molding die, a horizontal ram, a verticalram, means for moving the horizontal ram to close two of the 'die parts, means 'for moving the vertical ram down to close'the third die part with the other two, closed die parts,timing means for maintaining the die closed for a first predeterminedzinterval, means for elevating the verticalram at the end of said predetermined interval "to permit the die to breathe, means for maintaining said vertical ram in its elevated position for a second predetermined interval and thereafter to reclose the die, and selectively operable means for rendering the elevating means and the reclosing means ineffective so that-the horizontal and vertical moving means may be operated without the elevating and reclosing operation.

11. In an angle molding press, a horizontal ram, a vertical ram, means for moving the horizontal ram, means for moving the vertical ram, means for controlling the horizontal moving means to-move the horizontal ram at fast-speed, means effective at a predetermined position in the travel of the: horizontal ram to render the fast speed controlmeans ineiTective and move the horizontal ram at 510w speed, a limit switch in the path ofmovement of the horizontal ram for stopping it and rendering the vertical ram moving means effective at fast speed, means eflfec'tive at a predetermined position in the travel of the vertical ram forc'ontrolling its moving means to "the horizontafram, means for moving the vertical ram, means for rendering the horizontal moving means effective to close the twc die' parts and stop,,:means operated by the horizontal ram when :the' two die .parts :arei :closed for rendering the vertical ram'moving means effective to move the ram down to close the third part .of the die and apply molding pressure, a timing mechanism for rendering the moving means eifective to move the vertical ram up to open the die at a predetermined time, means eflective after a predetermined interval for again controlling the vertical moving means to move the vertical ram down to close the die and apply a molding pressure, another timing means effective after a predetermined interval to effect movement of the vertical ram upward, and means for stopping the vertical ram in its uppermost position and for controlling the horizontal rammoving means to move the horizontal ram to open the molding die.

13. In an angle molding press for operating a three-part molding die to compress a molding material into a molded article, a horizontal ram carrying a part of the molding die, a vertical ram carrying another part o'fthe molding die, means for moving the horizontal ram to close and hold two parts of the molding die together, means for moving the vertical ram to bring the third part of the molding die into closing relationship'with the other two die parts, a plurality of valves for controlling the moving means for the said rams, a horizontal in solenoid for operatinga valve to move the horizontal ram to in position to close two of the die parts,.a horizontal-out solenoid for controlling a valve to move the horizontal ram to outposition to open the molding die, a vertical up solenoid for controlling a valve to move the vertical ram up to open the molding die, a vertical down solenoid for controlling a valve to movethe vertical ram down to close the die and apply :molding pressure to the molding material, and electrical controlled means for operating the said solenoids in a predetermined sequence and at predetermined intervals to move the rams to close the-die to apply a given molding pressure, then release the molding pressure to permit breathing for the escapement of gases, reapplying molding pressure, and subsequently retractin the rams to open the molding die to release the molded article.

14. In an angle molding press, a vertical ram, a horizontal ram, means for actuating the vertical ram, means for actuating the horizontal ram, a first limit switch in the path of movement of the vertical ram for rendering the vertical ram actuating means ineffective when the ram reaches its uppermost position and for rendering the horizontal ram actuating means automatically effective to move the horizontal ram, a second limit switch positioned in the path of movement of the horizontal ram for rendering the vertical ram actuating means effective to move the vertical ram, means for maintaining the vertical ram actuating means ineffective so that the vertical ram remains at its uppermost position until the horizontal ram actuates said second limit-switch, and a third limit switch in the path of movement of the horizontal ram for controlling the horizontal actuating means to maintain pressure on the horizontal ram while the vertical ram moves downward.

15. In an angle molding press using a multipart die, a vertical ram for moving a die part, a horizontal ram for moving a die part, means for moving the vertical ram, means for moving the horizontal ram, a plurality of solenoids for controlling the ram actuating means to determine the down and up movement of the vertical ram and the in and out movement of the horizontal 21 ram, relays for controlling the solenoids, a plurality of timing devices for controlling the time of operation of predetermined relays, limit switches associated with each ram and electrically connected to predetermined relays, and means to energize the relays in a predetermined sequence to control the operation of the solenoids to render the ram actuating means efiective to move the rams and the die parts through a given cycle as determined by the timing devices and th operation of the limit switches, means to elevate and reclose the vertical ram to permit the die to breathe, selectively operable means tocontrol the vertical moving means to reciprocate the vertical ram in successive cycles independent of the horizontal ram, and interlocking switches for rendering the breathing means ineffective to cycle the vertical ram without breathing.

16. In an angle molding press for operating a three part die, a horizontal ram, a vertical ram, a plurality of means for operating the horizontal and vertical rams, manual control means for actuating the operating means to move the horizontal ram to close two of the die parts, manual control means for actuating the operating means to move the vertical ram down to close the third part of the die, and interlocking means effective upon actuation of one of the manual control means to prevent operation of the other manual control means.

17. In an angle molding press for operating a three part molding die, a horizontal ram, a vertical ram, a first manually controlled means for moving the horizontal ram to close two of the die parts, a second manually controlled means for moving the horizontal ram to open two of the die parts, a third manually controlled means for moving the vertical ram to close the third part of the die with the other two parts, a fourth manually controlled means for moving the vertical ram to separate and open the third part 01' the die from the other two parts, and means for interlocking all 01 the manually controlled means so that when one of them is operated the others are rendered incapable of operation.

18. In an angle molding press, a horizontal ram, a vertical ram, a low pressure-high volume pump, a high pressure-low volume pump, means to connect both of said pumps to either one of said rams for moving the particular ram at a high speed to a predetermined point, means positioned at said predetermined point for disconnecting the low pressure-high volume pump so that only the high pressure-low volume pump is efl'ective to move the particular ram at a slow speed, and means to prevent the simultaneous operation of both rams at high speed.

19. In an angle molding press, a ram, a plurality of electric motors, a control circuit for each of the electric motors, a plurality of pumps each driven by a particular one or said motors, said pumps supplying fluid pressure to drive the ram, and means controlled by the movement of the ram to interrupt the circuit to one of the electric motors to render one of the pumps nonoperative so that the movement of the ram continues at a reduced rate 01' speed.

20. In an angle molding press for operating a three part die, a horizontal ram for closing two parts of the die, a vertical ram for closing the third part of th die with the other two parts in closed position, a hydraulic pressure system for" supplying fluid under pressure to operate the rams, an electrical control circuit for controlling the hydraulic pressure system comprising a plurality of limit switches spaced along the path of travel of each of the rams and operated by the movement of the rams, one pair of said switches rendering a portion of the hydraulic system ineffective for each of the rams, a second pair of said switches rendering the entire hydraulic system ineffective for each of said rams, and a third pair of said switches electrically interconnecting the hydraulic system so that the movement of each of the rams is controlled by them ovement of the other ram, and a plurality of time delay relays for controlling the time and direction that the pressure is supplied by the hydraulic system to the vertical ram.

21. In an angle molding press, a horizontal ram, a vertical ram, means for supplying hydraulic power to move the rams, a first automatic electrical control circuit for controlling the supply of hydraulic power to the horizontal and vertical rams to simultaneously move them through a cycle of operations, a second automatic electrical control circuit for controlling the supply of hydraulic power to the vertical ram to move it through a cycle of operations, manual control means for controlling the supply of power to each of the rams to move either one in I, single direction, and selective means for rendering only one of the control means effective at any one time.

22. In an angle molding press having an electrically controlled hydraulic system for operating a multi-part molding die, a horizontal ram for moving one die part into closing engagement with a second die part, a vertical ram for closing the third part of the die with the two other die parts, electrically controlled hydraulic means for moving the horizontal ram to close the two die parts and stop, electrically controlled hydraulic means operated by the horizontal ram when the two die parts are closed to move the vertical ram down to close the third part of the die and apply molding pressure, electrical timing means for repeatedly rendering the hydraulic moving means eflective to move the vertical ram up a predetermined distance to open the die after predetermined timed intervals, other electrical timing means for, maintaining the die open for predetermined intervals and thereafterto close the die and apply molding pressures repeatedly to the die, electrical means for stopping the vertical ram in its upper open position after a predetermined number of cycles of up and down movements thereof and for moving th horizontal ram to open the die on completion of the molding operation, and electrical interlocking means for operating any ram independent of the other ram.

' EDWIN F. KEUSCH.

LESTER O. REICHELT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,863,448 Landenberger et al. June 14, 1932 2,070,720 Ernst Feb. 16, 1937 2,227,265 Lauterbach Dec. 31, 1940 2,232,103 Ernst et a1 Feb. 18, 1941 2,259,576 MacMillin Oct. 21, 1941 2,338,350 Oberholtzer Jan. 4, 1944 2,349,916 Stacy May 30, 1944 2,367,242 Stacy Jan. 16, 1945 2,398,227 Hubbert Apr. 9, 1946 2,409,725 Whitmore et al Oct. 22, 1946

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