Патент USA US2113115код для вставки
April 5, 1938. |-|_ F, MacMlLLlN ET AL 2,113,115 . HYDROMECHANICAL PRESS'Filed May 25, 1954 /30. 4 Sheets-Sheet l April 5, 1938. H. F. Mac-MILLIN ET Al. V 2,113,115 HYDROMECHANICAL PRESS Filed May 25, >19.1.54» 4 Sheets-Sheet 3 36 37 1 /A/l/E/V TORS ATTORNEYS April 5, 1938. ' H. F. MacMlLLlN ET Al. 2,113,115 HYDROMECHANICAL PRESS Filed May 25, 1934 NìI 4 Sheets-Sheet 4 Patented Apr. 5, 1938 y 2,113,115 UNITED STATES PATENT oFElcE ’ 2,113,115 i HYDRQMECHANICAL PnEss Howard F. MacMillin and Don C. Youngblood, Mount Gilead, Ohio, assignors, by mesne assign ments, to The Hydraulic Press Corporation, Inc., Wilmington, Del., a corporation ol' Dela Ware Application May 25, 1934, serial No. '127,550 (c1. 10o-11) 3 Claims. 'I'his invention relates to presses, and, in par ticular, to hydraulic presses having mechanical connections for the application of hydraulic power. Figure 3 is a longitudinal section through the control valve shown in Figures 1 and 2, but with the parts in a “reverse” position to produce an upward stroke of the platen; - One object of our invention is to provide a hydromechanical press wherein` the power is pro duced by hydraulic means but applied by me chanical connections. Another object is to provide a hydromechani cal press having a horizontally-disposed hydraulic> cylinder-and-piston assembly arranged to move a vertically-disposed platen, as through toggle Figure 4 is a side elevation of the press shown in Figure 1, the control valve being- omitted to conserve space; Figure 5 is a vertical section along the line 5-5 of Flgure 1; 15 cal press wherein a hydraulic ram moving in Figure 6 is a wiring diagram of the control circuit for the press of my invention; Figure 'l is an enlarged detail view- showing the crank shaft and solenoid connections. General construction. of the press one direction is caused to move a platen in a Referring to the drawings in detail, Figure 1 or crank connections therebetween. Another object is to provide a hydromechani _direction perpendicular thereto. ' shows a press having a base l and a top piece 2 Another object is to provide a hydraulic press having mechanical means for adjusting the maxi 20 mum position reached by the platen during oper ation. ' Another object is to provide a hydromechani cal press wherein an adjustable wedge is used to regulate the position reached by the platen 25 in its motion. Another object is to provide a hydraulic press having a hydraulic cushion in one of the press ing surfaces, this cushion embodying means for stopping or reversing the action of the press 30 when the pressure upon the cushion reaches a predetermined amount. Another object is to provide a hydromechani cal press with a hydraulic cushion in one of the pressing surfaces thereof, together with an elec 35 trical switch actuated by the pressure undergone . by the cushion in such a manner that the switch is operated to energize an electrical circuit which in turn changes the motion of the press when the pressure upon the cushion exceeds a pre 40 determined amount. ` Another object is to provide a hydroinechani-cal press having electromechanical control means for permitting the press to be manually con trolled, pressure-controlled, or position-controlled 45 in either a semi-automatic or completely-auto matic manner. v11s agency of the strain rods l, on which are threaded the nuts 5.- Secured to the side members 3, as 20 by the screws 6, are the retaining members l. The latter are arranged adjacent to the guide portions 8, serving to receive the press platen 9 and guide it in its vertical reciprocation. The platen 9, on its lower surface, is provided with a 25 slot I0 adapted to hold a die, work pieces or other suitable devices. Journaled in the bear ings II inthe upper partcf the platen 9 is a cross shaft I2 (Figures 1 and 5), to which a link member I3 is pivotally secured. The opposite end of the link member i3 is In> the drawings: Figure 1 is a front elevation, partly in section, of the hydromechanical press of my invention, 50 -showing the control valve in longitudinal sec tion, and in a neutral position; Figure 2 is a longitudinal section through the control valve shown in Figure 1, but with the parts arranged in the “forward” position so as v 30 pivotally mounted upon the cross shaft I4, which is journaled in the bearings l5 on the yoke por tion I6 of the hydraulic cylinder Il. The cross shaft I4 also pivotally supports the link mem 35 bers I8, whose upper ends are pivotally mount ed upon the cross shaft I9. The ends of the cross shaft I9 are journaled in the bearings 20, arranged within a movable anchor block 2|, which in turn is reclprocable along vertical guide 40 portions 22v on the side members 3 and held in position by the side plates 23, bolted thereto by the screws 24 (Figure l). The upper part of the anchor block 2l is threaded to receive the vertical rods v 25. ` 55 to produce a down-stroke of the platen; interconnected by side members 3 through the The latter pass upwardly 45 through the top member 2 and are provided with coil springs 26, held in place by the threaded nuts 21. Accordingly, the anchor block 2| is yieldably urged upward against. the press top member 2 by the springs 26. The anchor block 50 2l likewise contains a stud screw 28, which is received within, the bore 29 of the top member 2. The latter is hollow to provide a tank for the ñuid‘_used to operate the various hydraulic mechanisms of the press. 55 v 2,113,115 2 To adjust the position of the anchor block 2|, a movable wedge 39 is provided (Figure 5), and interposed between the anchor block 2| and the lower surface of the press top member 2. When this Wedge is moved horizontally, as by the hand wheel 3| upon the threaded stud shaft 32, the wedge 39 moves in or out and consequently moves the anchor block 2| up or down. 'This adjust ment of the position of the anchor block 2| reg 10 ulates the lowest position of the platen 9 during vided with a spring |32 held in position by a col- _ lar |33. The reciprocation of the control rod |3| is limited by the collar |34 mounted on the lower end thereof. An adjustable collar |35 is also placed upon by the control rod |3I, and is adapted to be engaged-by the contact sleeve |36 of the arm |31 bolted to the extension |59 0f the platen 9. (Figure 4.) 'I'he platen 9 is also provided with an arm |38 its working strokes. 'I'he hydraulic cylinder I1 contains a piston 33, having a contact sleeve |39, adapted to slide up and down along the switch rod |93 (Figure 4) whose piston rod 34 is threaded into a swivel and engage an adjustable collar |49 thereon. 'I‘he switch rod |93 reciprocates vertically in bored lugs |4| and |42, attached respectively to the top mëfmber- 2 and the side member 3 of the press. The switch rod |93 is surrounded by the coil spring |43 held in place by the threaded cap |44. The reciprocation of the switch rod |93 is limited by the collar |45, engaging a lug |4| on 20 the top member 2 of the press (Figure 4). The control rod |3| isprovided with an adjust block 35, arranged to swivel around the shaft 36. 15 'I'he latter is mounted upon a bracket 31, se cured to the side members 3 of the press (Figure 5). To prevent leakage between the piston rod 34 and the cylinder |1, through which it passes, an adjustable gland 38 is provided, and arranged 20 to compress a packing 39, whereby such leakage is prevented. The base portion I of the press contains a cushion block 49 reciprocable in a bore 4| against the pressure of the coil spring 42. The lower por 25 tion of the cushion block 49 serves as a hydraulic piston, and the space between it and the bottom of the bore 4| contains fluid, such asA oil. The leakage of this fluid is prevented by the adjust able gland 43 adapted to compress the packing 44 30 around the cushion member 49. A pipe 45 leads from the bottom of the bore >4| to the switch-actuating cylinder 96. ‘Within this cylinder 96 is a piston 95 reciprocable against theurge of a coil spring 91. 35 control rod | 3| therethrough. The latter is pro The tension of the spring 91 is adjusted by the threaded plug 98, through which passes the piston rod 94. 'I'he lat ter is adapted to engage the switch knob 93 of an electrical switch 99, whose connections will be hereinafter more fully disclosed. Thus when 40 the platen 9 causes pressure to be exerted upon the cushion 49, the latter will transmit this pres sure by the fluid within the bore 4| to the switch cylinder 96. When this pressure becomes suffi cient to overcome the resistance of the spring 91, 45 the piston rod 94 will engage the knob 93 and throw the switch 99. Controlling devices for the press , 'I'he press is arranged so that it may be oper 50 ated in a variety of ways. First of all, it may be operated by hand, so that each motion of the platen 9 downward or upward is controlledby a hand lever shifted by the operator. able collar |29 which serves to engage the knob |2| of a switch I |1 (Figure 4), when the upward limit of the platen is reached. Similarly, the switch rod |93 is provided with an adjustable collar |92 adapted to engage the knob |9| of a switchl 9| when the lowermost position of the platen 9 is reached. The control rod |3| is also provided with a 30 collar |46, engaged by the crank |41, mounted upon the crankshaft |48. 'I'he latter is supported in the lugs |49 on the side member 3 of the press, and is provided with a hand lever |5I, by which the crankshaft |48 may be turned. (Figures 1 and 4.) Y 'I'he opposite end of the crankshaft |48 is pro vided With a lever |52, which is connected by the link |53 to a yoke |54 on the end of the arma ture shaft |55 of the solenoid |56. Accordingly, 40 when the solenoid |56 is energized, the crank shaft |48 is rotated. ` The coil spring |51 is ar ranged between a vhook |58 on the side member 3 and a lever |59, mounted upon the shaft |48 and extending in an opposite direction from the lever 45 |52 (Figures 4 and '1). i Also secured to the crankshaft |48 is a lever |69, which engages a link |6| , to the opposite end of which lis attached the valve connecting rod |62 (Figure 1). 'I'he latter passes through the end 50 walls of valve casing |63, within which recipro cates the'valve member, generally designated |64. The valve member |64 is provided with a neck The press may likewise be controlled for “semi |65, upon which spaced heads |66, |61 and |68 55 automatic operation”, whereby the plunger per cornes to rest; or else it may be controlled for are arranged. 'I'he valve neck |65 also contains a bored passage |69 so as to nàaintain communi cation between opposite sides of the valve head |61. The valve casing |63 is provided on one side "completely automatic operation”, whereby the with the spaced ports |19, |1|, and |12, all of. plunger performs a working stroke, reverses it self, returns to its starting position, performs an other working stroke, reverses itself again, and so on, repeating the working strokes indefinitely 'until stopped by the operator. The reversal of the platen may be either “pressure controlled” so leading to the tank |15 of a hydraulic pump |16.„ The pressure line |11 from the _hydraulicpump»A |_16 enters the valve casing |63 :by the îport |13., whereas the suction line |18 proceeds downwardly forms a working stroke, reverses itself, proceeds to the top of its return stroke and automatically as to occur when the pressure exerted by the platen reaches a predetermined amount; or “po sition-controlled”, as when the platen reaches a predetermined position. These results are ob 70 tained by the control devices shown in Figures 1 and 4, and by the electrical circuit shown in Figure 6. . The top member 2 and the base member I of the press are provided with lugs |39, which are 75 bored to permit the vertical reciprocation of the these being connected to the discharge pipe |14, y into the tank |15. , The valve casing |63 also contains ports |19 and |89, from which pass the pipes |8| and |82. These proceed respectively to the opposite ends of the hydraulic cylinder |1 (Figure 5). Thus when the valve member |64 is set, as shown in 70 Figure 1, the pump by-passes its fluid and the press remains in a neutral position. In the Fig ure 2 arrangement, pressure fluid passes through ' the pipe |8| into the space in front of the pis ton head 33, causing the cylinder |1 to recipro 75 2,113,115 cate and execute a downward motion of the platen 9 (Figure 5). Conversely, when the valve member |64 is arranged as shown in Figure 3, pressure fluid will enter the space behind the 3 of the pressure cylinder 96 and the piston rod 94, the latter disconnects the pilot circuit and dc energizes the holding coil 1| of thc magnetic switch 50, thereby de-energizing the solenoid |56. the cylinder I1 to reciprocate rearwardly and The spring |51 then causes the valve member |64 to move to its Figure 3 position, thus starting an draw the platen 9 upward. Thus the operation upward stroke of the platen. of the valve member |64 may-be controlled man ually by the hand lever |5|, or else electrically If, on the other hand, the arms 84 and 85 of the double-throw switch 83 are closed upon the piston head 33 by way of the pipe |82, causing by the action of the solenoid |56. . Electrical control circuit contact pointsl 88 and 89, the platen-operated lower position switch 9|, which is normally closed, will be thrown open when the switch rod The electrical circuit whereby the solenoid |56 - |03 is moved downward by the platen until the and the electrical accessories of the press are collar |02 engages the switch knob |0| and opens connected or disconnected is shown in Figure 6. the switch. This again de-energizes the hold ing coil 1| ofthe magnetic switch 50, and accord Electrical energy for the operation of the cir cuit is received from the power lines 55 and 56 ingly de-energizes the solenoid |56, and thus in and passes to the magnetic switch, generally a similar manner to that previously‘described, causes the valve member |64 to be'shiited> to its designated 50. The magnetic switch 50 is a two reverse position (Figure 3) under the action of pole normally-open main switch, which is pro vided with switch arms 59 and 60, adapted to ‘the spring |51. Thus by throwing the double engage switch points 6| and '62, to which the throw switch 83 in one direction, the press bc power lines -55 and 56 are respectively connected. The switch arms 59 and 60 are normally kept out of contact with the switch points 6| and 62 by being mounted upon the shaft 63, which is rotated in the direction of the arrow by the spring 53 attached to the arm 52 and anchored to the hook 54. The solenoid |56 isenergized by the lines 51 and 58 coming from the switch arms 59 and 60. ' ï The magnetic switch 50 is rotated in the op posite direction >to thc arrow and thereby closed by an electrical vpilot circuit connected across Ll the lines 55 and 56. This pilot circuit com prises three branches 65, 66, and 61, having'a common circuit portion 68, connecting each branch to the power line 56. The branches 85, 66 and 61 also have a common circuit portion 69 40 connecting them to the power line 55. The cir cuit 68 includes the holding coil 1I, which, when energized, serves to close the switch 50, this comes reversible when a predetermined pressure is reached, whereas by throwing it in the oppo site direction the press becomes reversible when a predetermined position is reached. When the holding coil 1| has been once cuer gized, however, and the contactor bar 14 caused to engage the contact arms 15 and 16, the hold ing coil 1| will be maintained in an energized _' condition through the lines 82 and 69, togethm~ with either of the circuits previously described, until either the emergency reverse switch 88, thc pressure reverse switch 90, or the lower position reverse switch 9| is opened. _ The holding coil 1| is connected by the lines 68 and 19 through the push button starter switch | |2 and the lines | I3 and 69 to the power line 55, previously mentioned. Assuming that the mag neticy switch 50 is open (Figure 6) and the var rious circuits de-energized, the closing of thc manually operated push button starter switch ||2 energizes the pilot circuit through the lines armature 12 attached to the switch shaft 63, as ` 68, 19, H3, and 69. This energizes the holding action being performed by its attracting the at 13. The opposite end of the armature 12 carries a normally-open contactor bar 14. When the holding coil 1| is energized, the contactor bar 14 engages the contact arms 15 and 16, thus connecting theline 65 with the line 69, and com pleting the pilot circuit through the former. The line 68 contains the manually operated switch 10 (Figure 6), whereby the holding coil 1| may be permanently de-energized. The line 68 contains a branch line 19, leading to a nor mally-closed emergency reverse push button switch 80, from the opposite side of which leads the line 8| to one arm 84 of the double-pole dou ble-throw switch 83. To the opposite arm 85 thereof is attached the line 82 leading to the 60 Contact arm 15 of the magnetic switch 50. The double-pole double-throw switch 83 con tains a pair of switch points 86 and 81 which, when engaged by the switch arms 84 and 85, will close `Jthe circuit through the normally closed pressure-responsive switch 90. Converse ly, when the arms 84 and 85 engage the opposite contact points 88 and 89 of the double-throw switch 83, the circuit will be closed through the normally-closed lower position switch 9| oper ated by the extension |50 of the platen 9. ' Assuming the switch arms 84 and 85 to be engaging the switch points 86 and 81, when the pressure -within the chamber 4| beneath the cushion 40 exceeds Va predetermined amount and 75 throws the pressure reverse switch 90 by means coil 1| and closes the magnetic switch 50. The 45 contacter bar 14 then engages the contact arms 15 and 16, maintaining the holding coil 1| in an energized condition even when the push button starting switch I|2 is released and opened. Under the action of the above described cir 50 cuits, the platen will move downward and engage the dies and Work pieces, reversing itself when the predetermined pressure or the predetermined position is reached, according to the setting ol the double-throw switch 83. The platen then rc 55 turns to its topmost position and comes to rest. This mode of operation is termed “semi-auto matic operation”. When “completely automatic operation” is de sired, so that the platen immediately starts an 60 other downward stroke after reaching its top most position, the circuit shown at the bottom of Figure 6 comes into play. This circuit includes the manually-operated switch ||5 connected on one side to the line 68 by the line 61 and on the 65 other side by the line ||6, running to the upper position switch ||1. The latter is a normally open switch which is closed when the platen pushes the control rod | 3| upward and causes ` the collar |20 to engage the switch knob |2| 70 and close the switch ||1. This again energizes the holding coil .1| of the magnetic switch 50. thus energizing the solenoid |56, shifting the valve member |64 to its .“working stroke” posi tion (Figure 2), and causing a downward stroke 75 4 2,113,115 of the platen to take place. The platen will then actuated by said platen, a member adapted to move downward, release the upper position switch I il, and will continue its movement until it causes either the pressure control switch 90 or the posi reverse the movement of a fluid, electrical means tion-controlled switch 9i to be thrown, thereby de-energizing the solenoid |56 and reversing the' action of the press. In this manner, the press is caused to repeat its working strokes indefinitely until the manual switch H5 is opened. ’I‘he reversal of the platen at the end of a work ing stroke, either at “position” limit or at "pres sure” limit, together with an electromechanical circuit for operating the press in a “semi-auto matic” or “completely-automatic” manner, has been disclosed in the present specification. It will be understood that we desire to compre hend within our invention such modifications as may be necessary to adapt it to varying condi tions and uses. Having thus fully described our invention, what we claim as new and desire to secure by Letters Patent is: 1. In combination in a press, a movable platen, a hydraulic cylinder-and-piston assembly adapt 25 ed to move said platen, a cushion adapted to be actuated by said platen, and means for causing the reversal of motion of said platen responsive to the attainment-of a predetermined pressure upon said cushion, said reversing means com 30 prising a member adapted to reverse the move ment of a fluid, electrical means adapted to shift said member to reversing position, and a pressure-responsive switch operatively connected to said cushion and adapted to be operated to 35 control the actuation of said electrical means in response to the attainment of said predeter mined pressure-upon said cushion. 2. In combination in a press, a movable platen, a hydraulic cylinder-and-piston assembly adapt 40 ed to move said platen. a cushion adapted to be adapted to shift said member to a reversing po sition, a switch adapted when operated to ener gize said electrical means to shift said member to a reversing position, and a hydraulic plunger connected to said cushion and adapted to oper ate said switch to energize said electrical means and shift said member to reversing position in response to theÀ attainment of a predetermined pressure upon said cushion whereby to reverse the direction of travel of said platen in response to its causing a predetermined pressure to be exerted upon said cushion. 3. In combination in a press, a movable platen, A a source of pressure fluid, a hydraulic cylinder and-piston assembly adapted to move said platen, a member adapted to reverse the movement of the iiuid, a cushion adapted to be actuated by said platen, between said source and said assem bly, electrical means adapted to shift said mem ber to a reversing position, a switch adapted when operated to energize said electrical means to shift said member to a reversing position, and a ' hydraulic plunger connected to said cushion and 25 having yielding means associated therewith ar ranged to oppose the shifting of said plunger when acted upon by the pressure ñuid trans mitted thereto from said cushion, said plunger being adapted to operate said switch to energize 30 said electrical means and shift said member to reversing position in response to the attainment of a predetermined pressure in said cushion suf ñcient to overcome the opposition of said yield ing means whereby to reverse the direction of 35 travel of said platen in response to its causing a predetermined pressure to be exerted upon said cushion. HOWARD F. MAcMILLIN. DON C. YOUNGBLOOD.