US2248464A

US2248464A - Die spotting and tryout press

Info

Publication number: US2248464A
Application number: US224146A
Authority: US
Inventors: Clement C Richard; Clifford H Kain
Original assignee: Allied Products Corp
Current assignee: Allied Products Corp
Priority date: 1938-08-10
Filing date: 1938-08-10
Publication date: 1941-07-08
Anticipated expiration: 1958-07-08

Description

July 8, 1941. c. c. RICHARD EIAL DIE SPOTTING AND TRYOUT PRESS 5 Sheets-Sheet 1 Filed Aug. 10, 1938 IIIII llllll July 8, W41. c. c. RICHARD EIAL DIE SPOTTING AND 'IRYOUT 'PRESS 5 Sheets-Sheet 2 Filed Aug. 10, 1938 MEL) ATTORNEY.

Juiy mm c. c. RICHARD ETAL.

DIE SPOTTING AND TRYOUT PRESS IHHHHHNHI l .ik N

5 Sheets-Sheet 3 11||||| IILF Filed Aug. 10, 1938 m. 0 T. m V. m C 7 m e C C /fforo July 8, 1941. c. c. RICHARD ETAL DIE SPOTTING AND TRYOUT PRESS Filed Aug. 10, 1938 5 Sheets-Sheet 4 Filed Aug. 10, 1938 5 Sheets-Shee t 5 flw HfA .r f m Q .2 Z w 0 5 z m. w lrl r i .0 8 m a 7 q a 5 a a 4 0 s 7 4 M o 7 7 6 w a you. J A: r. 7 s a a Q n W l 6 mm 5 a 8 v 7 6 M M w/ 7 5 2 7 a m 4 2 6 3 8 Patented July 8, 1941 iJNiTED DIE SPOTTING AND TRYOUT PRESS corporation of Michigan Application August 10, 1938, Serial No. 224,146

8 Claims.

This invention relates to die spotting and tryout presses, the object being to provide a new and unique structure for the purpose wherein a die is carried by a movable table to a position beneath the ram which carries the complementary die for spotting or tryout purposes, or carries the first named die from such position beneath the ram to a location permitting workmen to chisel, grind, file or otherwise work upon the die surfaces without necessitating the Workmen to occupy cramped and dangerous positions between the complementary dies.

In the following description, it is generally assumed that the ram supports the male die commonly known as the "punch and the table supports the female die commonly known as the die but it is to be understood that the die parts may be reversely positioned in the spotting and tryout operations.

In presses for the formation of sheet metal par-ts, it has heretofore been the practice to mount the punch on a movable ram and mount the die on a bolster plate fixed to the bed in vertical alignment with the punch. The cooperating surfaces of the die parts must match exactly in order that the metal formed thereby should be perfectly smooth in its contour. It is a troublesome matter, in the former presses utilized for this purpose, to assemble the die parts in position in the press due to the necessity of having to mount the die set in the press by use of a crane, jacks, skids or other means consuming considerable time and labor and tying up expensive crane equipment that could normally be used for other purposes and further, there has previously been considerable difficulty in properly positioning the punch and die in the press in respective attachment to the ram and bolster plate.

Our new and improved structure avoids such laborious operation and the time consumed thereby in the following manner:

The supporting table for the die is arranged to be moved to a position at one side of its operative position, it being secured directly to the table and the punch positioned on the die. The table may then be moved to position the die parts beneath the ram and the ram lowered to engage the punch shoe. The punch is then secured to the ram leaving the die attached to the table. A feature of the invention therefore resides in the provision of means for moving the table and die carried thereby from and to operative relation with the punch carried by the ram. This permits operation on the face Of the die by workmen in trueing the surface thereof to conform to the surface of the cooperative punch engageable therewith and the mounting of the dies in the press in their respective rela-.

v tionships is accomplished more readily andat less labor cost than is possible with previous presses. v

A further feature of the invention is involved in the mechanism for moving the ram 'to'bring the punch to surface contact with the die in what is known as the "spotting operation and in which the face of the punch is coated with a colored pigment and when the two diesare in surface contact, the high point of the die will be colored by the corresponding surfaces; of the punch and this has to be worked down by;han d processes such as chiseling, grinding and filing to secure a uniform surface on the cooperating die faces. 1

The last said mechanismisof such character that the ram may be moved at a high speed and; under comparatively low'hydraulic pressure to position the punch thereon at a point short of contact with the die and the ram then moved at low speed to bring the punch to surface con-.

tact with the die in order that the spotting may be accomplished. 1 j

The die parts, when they have been worked down by hand and are considered to have},attained practical uniformity in the contacting surfaces, may then be used in what is known as a tryout operationin order tofmally determine that the dies are in perfect cooperative relationship for the forming of sheet metal arti-.

' cles. Such tryou operations require-muchgreater pressure than is required in the ."spotting operations. A further feature ofv the invention therefore resides inthe provision of .con-. trol mechanism for the ram whereby the punch supported thereby may be moved under high speed and comparatively low pressure to a point short of contact with the die on the table and then moved at comparatively low speed to con-. tact with the die under high pressure to form,

' punch, trim, or otherwisetry outthe dieslon sheet metal previously inserted therebetween.

n The invention therefore seeks not only to pro.- vide a mechanism permitting the ready, mountfing of the punch and die in the press but also providing a structure wherein the danger to the; workmen, who formerlyhad portions or all of the body in hazardous positions between V the. punch and die parts in the finishing'of the surfaces, may now perform this finishing operation with the die withdrawn from operative relation with the punch carried by the ram, and thus the surface is readily accessible for any work to be performed thereon. This results in a great saving in that the die can be moved rapidly to or from the non-operative position to the subsequent die spotting position as many times as may be necessary to complete the spotting and tryout operations, until the entire surface has been finally formed, it being evident that the finishing of the die surface can be more easily and rapidly performed if the workmen have greater freedom of body movements and better access to the surface to be shaped in conformity to the punch.

The operation of the press is preferably by use of oil pressure and by electrical control thereof for causing operation of the die parts, either in the vertical movement of the punch in respect to the die or in the movement of the table carrying the die to and from its operative position in respect to the punch, all as is hereinafter more fully described and claimed.

A die spotting and tryout press embodying our invention in its preferred form is shown in the accompanying drawings in which Fig. 1 is a front elevation showing our improved press, the punch and die being shown in dotted lines indicating the open and the closed position thereof.

Fig. 2 is a plan view thereof partly in section to show a detail of the construction.

Fig. 3 is a side elevation taken from the right hand side of Fig. 1.

Fig. 4 is a vertical section taken on line 4-4 of Fig. 1 and showing the table operating cylinder in full lines.

Fig. 5 is a section taken on line 5-5 of Fig. 1.

Fig. 6 is a section taken on line 66 of Fig. 2 showing the means for locking the movable table in its operative relation with the punch carried by the ram.

Fig. 7 is a diagram showing the hydraulic and electrical circuits for control of the mechanism.

Fig. '7 is a supplementary diagram showing hydraulically controlled means for setting the brake and releasing the table lock.

Fig. 8 is a detail in elevation showing the selector lever and control buttons for the electric circuit.

The press is shown in one of its possible forms in front elevation in Fig. 1 and consists of the vertical standards I and 2 which are of hollow form and a base 3 and a crown 4. The ram 5, to the lower face 6 of which is secured the punch I, is shown by dotted lines. On the base 3 is mounted a table 8 which carries the die 9 shown by dotted lines and this table is movable to withdraw the die 9 from beneath the punch I.

The ram 5 has the opposite end portions l and i l extending into the hollow columns I and 2 and is attached to the upper end of the piston rods l2 and I3 respectively which operate in the respective cylinders I4 and I which is intended to apply pressure to either the lower or the upper side of the pistons 16 and I! respectively, shown more clearly in Fig. '7 and will thus move the ram upwardly or downwardly dependiiig upon which side of the piston the pressure is applied. As fluid is supplied to each of the cylinders simultaneously, either on the upper or k lower side, the pistons will move and maintain the ram with its lower face in a horizontal plane and to insure the maintenance of the ram in exactly a horizontal plane, there is a vertical rack l8 carried by the column I and a similar rack I9 carried by the column 2. A shaft 20 is carried by the ram and extends through a bearing 2| and 22 adjacent its opposite end and this shaft carries

end pinions

23 and 24 engaging in the respective racks l9 and I8. The gears and racks provide a constant surface contact which is a well known form of rack and pinion structure and the shaft secured to the ram serves to maintain the ram with its lower face 5 always in a horizontal plane at any point of its movement in a vertical plane, and it is a feature of this invention to provide a means for hydraulically moving the ram and for maintaining the ram With its face in a horizontal plane during movement under hydraulic pressure.

As will be understood more clearly from Figs. 3 and 4, the base 3 has a portion 25 extending from the front of the machine and at the extreme forward end has a pulley 28 on one side and 21 on the other side and has similar pulleys at the rear end as indicated at 28 in Figs. 2 and 4.

There are thus two pairs of pulleys on each side of the frame portion 25 and the rear side of the machine and on each side of the machine is a belt 29 for each pair of pulleys and these belts return on the under side of the machine through a sheet metal channel 30 on each of the opposite sides of the extension 25 through which the belts run. Each belt is attached to the table at the forward edge at 3| and at the rear edge at 32. These belts coupled to the table serve as an endless protection for the ways 33 on which the table 8 slides from its position under the ram to and from its position to be worked on. The table is moved on the extension 25 and portion thereof that extends between the columns I and 2 and is slidably supported in respect to such extension on ways 33 built as a part of the base 3 shown in Fig. 6.

The table is moved outwardly from position beneath the ram or from the outward position to beneath the ram by means of a hydraulic cylinder 36 which has a piston therein (not shown) but to the opposite sides of which liquid under pressure may be applied to move the table in the predetermined direction.

The piston rod 31 extends from the forward end of the cylinder 36 and is secured to a depending fiange and through an aperture in the portion 38 on the table and securely attached thereto as by a nut 33. Pressure applied to the rear of the piston in the said cylinder will move the table from the position shown in Fig. 4 outwardly from beneath the ram 5 and into a position readily accessible for workmen to true the surface of the die to shape in proper conformity with the surface of the punch 1 carried by the ram. By this structural arrangement, the workmen are in position to freely move about in the operation of trueing the die surface without necessity of cramping their bodies between the upper and the lower die as has heretofore been the practice, where the lower die is fixed in position beneath the ram. There is less danger to the workmen also in thus removing the lower die to a position from beneath the upper die, as accidental release of the upper die causing it to move downwardly, could result in injury to the workmen.

In the construction here shown, there is provided a brake shoe 48 and companion shoe 4|] on a wheel 4! secured to the shaft 20 on the forward face of the machine shown in Figs. 3 and 7. There is a similar shaft 20 on the opposite face of the machine as will be clearly understood from through pressure regulating valve 72 and line 13 Fig. 3 which likewise has pinion gears thereon at its opposite ends, as on the shaft 20, which ride in similar racksv (not here shown), and, as previously stated, the gears and racks maintain the ram with its lower face constantly in a horizontal plane in its upward or downward movement.

The brake is utilized to hold the shaft 29 from rotation and is clamped to the wheel by means of an arm 42 to a clamping means indicated generally at 43 in Fig. 1. The arm is swung by hydraulic pressure, being attached to a piston in a cylinder 44 and the arm moved by pressure of spring 42 in one direction to tighten the brake shoe and by hydraulic pressure in cylinder 44 in the opposite direction to release it.

It is desirable that the table be accurately fixed in position when moved to beneath the ram for cooperative relation therewith. This mechanism is shown in section in Fig. 6 and consists of a hydraulic cylinder 4'! (Fig. l) with piston rod 52 mounted on the base 3 of the machine and at the left side of the path of movement of the table which has the slide 35 engaging a complemental slide 33 on the base. A flange of the table 8 is formed with an aperture in which is secured a hardened member 48 having a coned recess 49 to receive a coned end on the lock pin 59. This pin is movable in a recess provided in a block secured to the base and is attached to the piston rod 52 of the hydraulic cylinder 41, shown in Fig. '7. It is not essential that the lock pin be moved hydraulically as hereinafter described, as other mechanism may conveniently be employed for the purpose, the essential point being that at the time the table is moved to beneath the ram it is required to be centered in respect thereto to maintain the die parts carried respectively by the ram and the table in alignment for registration.

It is to also be noted from Fig. 5, that the ram carries a bracket 53 on which is a contact element 54 which may engage a companion element 55 or 51 which are locked in any desired position on a bar 58 by means of a. screw 59 for each element 55 and M. The contact of the element 54 with one of the elements 55 or 51 determines the distance through which the ram is moved.

The hydraulic and electric systems, shown diagrammatically in Fig. 7, include an oil or liquid reservoir 55 in the base of the column 2 and an electric motor 46 and pumps operated thereby positioned in the base of the column l.

Obviously, the parts operable by hydraulic pressure must be entirely within the control of the operator as is also true with the electric circuits required for the various operations. In order that a complete understanding of the manner of control of the press and its operation may be had, we have shown the hydraulic and electric circuits diagrammatically in Fig. '7 in which the ram 5 is shown in its proper relation with the cylinders 14 and I5 while the table 8, for the purpose of clarity in showing the circuits, is offset in respect to the ram.

The hydraulic system includes the oil reservoir 45, the electric motor 46 which drives the high capacity low pressure pump 69 and the low capacity high pressure pump 51 The high capacity pump discharging through the line 65 to the pressure regulating valve 65 and thence through the conduit 6'! through the three-way unloading valve 68 and check valve 59 through the conduit 19. The high pressure, low capacity, pump 6| discharges through the conduit H and which joins the line 10 prior to its connection with the manually operated four-way valve 14. The four-way valve 14 is controlled by a lever 15 shown in Fig. 8 which may occupy a mid position or an upper or a lower position in the slot 16. With the lever I5 in the upper position, the oil flow is directed through the valve 74 to the conduit l1 bypass valve H and thence through conduit 15 to the solenoid operated four-way valve 18, and by means of the actuating solenoids l9 and (hereinafter more fully described) directed to conduit 8| and check valve 82 and flow control valve 9! to the conduits 83 and 84 which combine the previously split circuit again to form conduit 85 which leads to both the under sides of the piston l6 and I! to lift the ram, or from the valve 18 through conduit 89 which leads-to the upper side of the pistons l6 and Il to lower" the ram for tryout or spotting purposes. In the upper position of the operating lever 15, the valve 14 directs the oil under pressure through the conduit 11. In the lower position, the oil flow is directed through the valve 74 to the conduit 81 bypass valve 8'! and conduit 81 to the solenoid operated four-way valve 88 through

conduits

89 or 90, depending upon the selection as hereinafter described, to actuate the piston in the cylinder 36 to move the table 8 in or out. Thus with the lever 15 in its upper position, the application of oil under pressure to the one side or the other of the pistons IE or ll raises or lowers the ram, and in its lowermost position moves the table in or out, depending upon the position of the selector valve and the solenoid operated

valves

18 or 88.

1 In Fig. 8, the control panel shows several push buttons designated as B .13 13 B and B The electrical diagram in Fig. 7 just below Fig. 8 shows the circuit controlled by the push buttons. The input 220-volt circuit is indicated at A in Fig. '7 and the main power switch is shown at 9|. The

two lines 92 and 93 lead to the electric motor 46.

Branching off from the lines 92 and 93 are two lines, one line 94 leading to one end of the primary coil or transformer 95 and the other line 96 is common to the various solenoids used in operating the

valves

68, 18, 9'! and 88. On the low voltage side of the transformer 95 are five relay coils R R R and R each of which is energized by the respective push buttons B to B inclusive. On the:220-volt side of the primary are five relay contacts C C C C and 0 7 As heretofore stated, on the bar 58, there are two limit switches 55 and 51 which regulate the length of the vertical stroke of the ram in the upward or the downward movement and this limitswitch is indicated in two places as 54 in Fig.7.

' The function of the electrical circuit in spotting a die is as follows:

Assuming, that the punch l is attached to the ram and the die 9 attached to the table 3 in position for a spotting operation and assuming that the'dies are closed at the beginning of the series of operations, the first step is to start the electric motor to supply oil under pressure to the system. Then the lever 15 is moved to the up position to operate the ram. This movement of the valve directs the hydraulic power through conduit "H and bypass valve I'l to the right side of the piston in cylinder 44, exerting pressure thereon and moving it to the left compressing spring 2*? and by means of lever 42

releases brake shoes

49 and 49 thereby permitting brake wheel il to rotate and the ram to move up and down freely. Bypass ll is so regulated as to direct the oil flow to cylinder 44 at any predetermined pressure required to compress spring 42 before the oil will pass to conduit 71 and thence to solenoid operated four-way valve 18, in order to assure the release of this holding brake before the ram is caused to move. It is also to be assumed that the limit switch 54 is between the stops 55 and 51, the reason for which is subsequently described.

In order to raise the ram with the punch attached thereto, the operator pushes the button B which closes the circuit to the coil R through the normally closed limit switch 54. When the coil R is energized, the relay contact C is closed and the solenoid 80 energized setting the valve 18 to position to feed the cylinders l6 and I! through the line 8|, and valves 82 and 9'1 and conduit 85 to the under side of the pistons I6 and [7. So long as the push button B is held closed, oil flows to the under side of the pistons and raises the ram 5. If it is desired to limit the ram movement to certain height as a matter of economy in time operation, the up stop 55 is so set that the contacts of the limit switch 54 will be broken when the ram reaches the predetermined height.

Referring to the l2-volt circuit, when the normally closed limit switch 54 is broken, the circuit is also broken to the coil R and therefore the relay contact C is broken and the solenoid 80 is de-energized. The valve 18 is spring centered and thus it returns to center, cuts off and locks the circuit to the cylinders l4 and I5 and stops the vertically upward movement of the ram regardless of whether the push button remains held in contact or not. If it be desired to raise the ram further than the point where the'limit switch is opened by the stop 55, the button B is pressed which bridges the limit switch 54 audit is thus possible to raise the ram further by pushing the button B and B at the same time.

The switch B is a four-pole push button type for energizing coil R at the same time it bridges the limit switch 54. Thus at the same time the push button B is pressed to raise the ram higher than is provided for by the limit stop 55, we close the contact C and thereby energize the solenoids of the

valves

68 and 91. This action has the effect of unloading the discharge of the high capacity pump 60 to return to the tank by way of the unloading valve 68 to the conduit 99 thereby reducing the speed. This also chokes the outlet in the lower part of the cylinders I 4 and I5 by restricting flow through the valve 91 when its solenoid is energized. The check valve 82 only permits flow of oil in one direction to the under side of the pistons l6 and H.

The next action is to move the table from beneath the ram to position the die to be worked on in shaping its surface to conform exactly to the contact surface of the punch. Movement of the table is made possible by moving the lever of valve 14 to the down position in the lower part of the slot it of the panel. This directs the flow of oil to the conduit 81 and bypass 8'! shown in Fig. '7 to the right side of the piston in cylinder 41, setting up pressure to move the piston and piston rod 52 to the left compressing spring 52 and withdrawing the coned end on lock pin 50, thereby releasing table 8 for movement on ways 33 of base 3. Bypass valve 81* is also regulated to direct the oil flow to cylinder 41 at any predetermined pressure required to compress spring 52 before the oil will pass to conduit 81* and thence to solenoid operated four-way valve.88, in order to assure the release of the table look before the table is moved out.

It is readily seen, therefore, that lack of pressure in either or both lines 11 and 81, due to the unloading feature of valve 14 or the fact the pumps are not supplying oil to the hydraulic system, the

springs

42 and 52 act to set the ram brake and the table lock. Either of the latter is released by hydraulic pressure being conducted to cylinders 44 and 41 from valve 14 according to whether selector lever 15 is set to actuate the ram or the table.

After release of the table lock, the oil flows through conduit 8'! making pressure available at the valve 88, the button B is pressed thereby energizing the coil R and closing the contact C which energizes the solenoid I00 of the valve 88. When the solenoid is energized, the valve 88 is positioned to feed oil under pressure to the conduit 89 leading to the rear of the piston in cylinder 36 and opens the conduit 95 to the return line 99 and pressure is thus built up at the left of the piston in the cylinder 35 and the table 8 is moved outwardly on its ways.

It is to be noted that the invention is not confined to use of a hydraulically controlled brake or table lock as other structures may conveniently be utilized under the control of the operator to set the brake and to actuate the table lock mechanism. The hydraulic conduits l0, l3 and 99 of Fig. '7 are the same conduits TU, 13 and 99 of Fig. 7 and thus it will be readily understood how the hydraulic mechanism for actuating the brake and the table lock mechanism may be included in the hydraulic circuits of Fig. 7.

The necessary work may be done on the die part positioned on the table, when the table is in its outer position, after which it is required to move the table to bring the die thereon beneath and in registration with the complementary die part on the ram. This is accomplished by pressing the button B which energizes the coil R and closes the contact C to the solenoid I 0|. The closing of the contact connects the high pressure conduit 81 with the conduit leading to the cylinder 36 and at the same time opens the conduit 89 to the return line 99. This applies pressure to the forward side of the piston in the cylinder 35 and moves the table on its ways to its position beneath the ram which is determined by the stops 98 and is held in position by the hydraulic lock shown in Fig. 6. This lock is engaged due to the repositioning of lever 15 of valve 74 to the neutral position where the oil pressure is reduced due to the fact that this valve unloads to the tank in this neutral position, thereby releasing the pressure in cylinder 4'! permtting spring 52 to inject the locking member so into its rest 48.

Prior to the table being moved to the locked position, the face of the punch may be coated with a colored pigment and the press is then in condition for the spotting operation in which the ram is moved downwardly to bring the punch into contact with the lower die. To perform this operation, the lever 15 is first moved to the up position to select operation of the ram and as the limit switch 54 is now held open by the stop 55, it is necessary to press both the bridge button B and the down button B Closure of the circuits controlled by the bridge button B and down button B starts downward movement of the ram as the hydraulic liquid from pump 6| is discharged through line 86 to the upper side of the pistons l6 and I1, and when the limit switch has passed the stop 55, pressure-is 'released on the button B and downward move- 'ment is continued by pressing only the push buttom of these pistons. The lower stop 51 ispositioned to stop the rapid downward movement of the ram 5 a little distance before the punch, carried by the ram, comes into contact with the die in order that better control may be had of the 'actual spotting operation, so, as the ram descends,

the limit switch 54 is opened by the stop 51 which breaks the circuit to the coil R and deenergizes the solenoid l9 permitting the spring centered valve 18 to stop the flow of oil to and from the cylinders l4 and It. To complete the spotting operation and control the speed of further downward movement of the ram 5, both the push buttons B and B are pressed bridging the circuit to coil R and energizing coil 19. This, at the same time, unloads the high capacity pump 60 by means of the three-Way unloading valve 68 and restricts the flow from the cylinders I5 and 15 by means of the solenoid operated flow regulator 97.

It is to be noted that the check valve 69 prevents back fiow of the discharge from the high pressure low capacity pump SI and since the pressure regulator valve 12 is set for high pressure, a low capacity high pressure flow is obtained to operate the ram at the time of bringing the dies together in the spotting operation. This control of the ram in its downward movement permits the making of tryouts with this arrangement without increasing the capacity of the electric motor at the same time making it possible to attain speed of operation as is required at all times other than that required for the momentary spotting or trying out operations.

From the above description of the mechanism of the press and of the electric circuits, it is believed evident that we have devised a mechanism and a control for the mechanism through which all the various objects and features of the inventionare attained-namely, a press for the spotting or tryout of dies in the manufacture of the same for commercial use, the lower die of the pair being movable to position where, after it has been spotted by contact of the upper die and the high pointsindicated by the spotting operation,

the workmen are able to cut away the high points by any approved means while the die is in a readily accessible position, without necessity of the workmen introducing all or portions of the body between the dies as has been the previous practice By this means, a much more rapid and safe completion of the job is accomplished because it is possible to work on the face of the die, move it to and from position for spotting and again work the surface of the die at successive intervals until the surfaces of the two dies are in accurate conformity.

After the spotting of the dies has been completed, a piece of work such as sheet metal, may be introduced therebetween and the dies tried out by forming the piece to thereby determine that the dies function properly. By the arrangement of the parts and by the control of hydraulic circuits, the press is under perfect control of the operator at all times, which includes a high speed movement of the ram from its upper position toward the lower position where it may be stopped prior to reaching the lower die at which to the function of the valves in the control circuit and an, electric circuit under the operators control causing operation of the valves at the desired time.

Having thus fully described our invention, its utility and mode of operation, what we claim and desire to secure by Letters Patent of the United States is- 1. In a die spotting and'tryout press, a, vertically movable ram carrying a die, hydraulically actuated means for moving the ram a horizontally movable table carrying a complemental die, hydraulically actuated means for moving the table to position the die thereon at one side of the die on the ram to expose the entire surface of the table die for a finishing operation by Workmen and for returning the table to position the die thereon in alignment with the ram die, a hydraulic system for the said hydraulically actuated means, means under control of the operator to supply the hydraulically actuated means of the-ram with liquid at low pressure and large volume to produce high speed of movement thereof, means controlled by movement of the ram to cause cessation of supply of liquid to the companion hydraulically actuated means, and means under control of the operator for supplying the said hydraulically actuated means of the ram with liquid in low volume and under high pressure to thereby cause a slow movement of the ram and create a high pressure contact.

' ated valve elements in said hydraulic circuit, and

, under the control of the operator whereby operaan' electric circuit including switch elements .tion of any of the hydraulically actuatable elements may be produced at will.

3. In a die spotting and tryout press, a vertically movable ram carrying the die, a horizontally movable table carrying a complemental die, a, pair of parallel ways on which the table is movable, a pair of flexible belts each having its opposite ends connected with the table and respectively aligned with the Ways whereby, as the table is moved, each belt rides in close association with the face of the respective ways to thereby protect the same from accumulation of foreign matter thereon, means for moving the ram toward or from the table in the operative relationship of the dies, and means for moving the table.

4. In a press, a vertically movable ram for carrying a die part, a support for carrying a complemental die part, hydraulically controlled means for moving the ram toward and from the support, said hydraulically controlled means including a motor driven pump of high capacity and low pressure, a motor driven pump of low capacity and high pressure, and means for controlling operation of said pumps whereby the ram is moved by the high capacity pump through a portion of its travel toward the die on the support and thereafter moved by the low capacity high pressure pump to bring the die parts to pressure contact.

5. In a die spotting and tryout press, a vertically movable ram carrying a die, a horizontally movable table carrying a complemental die, means including a cylinder and a piston therefor for moving the table toward or from a position with the die thereon in vertical alignment with the ram die, means including cylinders and pistons for moving the ram with the die thereon toward or from cooperative relation with the table die, a hydraulic system for supplying liquid to said pistons and cylinders of the ram or table including a source of liquid supply, a pump for providing liquid under pressure to the hydraulic system, valve mechanism in the said hydraulic system operable to direct liquid under pressure to the ram or the table cylinders, solenoids for control of the said valves, electric circuits for the said solenoids, a selector station to which the said circuits lead, electric switching mechanism at the said station for closing or opening any of the said circuits at the will of the operator, a manually controlled means at the said selector station adapted to direct liquid under pressure to the ram cylinders to raise or to lower the same as determined by the selected switch or in another position to apply liquid under pressure to the table cylinders to move the table in or out as determined by the selected switch, said manually controlled means preventing application of pressure to move the ram or to move the table,

when the respective other element is being moved.

6. In a die spotting and tryout press, a vertically movable ram carrying a die, a horizontally movable table carrying a complemental die, a hydraulically actuatable means for moving the table with the die thereon toward or from a position in vertical alignment with the ram die, a hydraulically actuatable means for moving the ram and die thereon toward or from cooperative position with the table die, a hydraulic system by means of which fluid under pressure is suppliable to the hydraulically actuated means for moving the table or to the hydraulically actuatable means for moving the ram, and valve means under the control of the operator to supply liquid in said hydraulic system to the hydraulically actuatable means of either the ram or the table while maintaining the respective other liquid pressure applying means inoperative, means for automatically locking the table from movement when the die thereon is in alignment with the ram die, and hydraulic means forming a part of the said hydraulic system for moving the table and automatically releasing the table for movement prior to application of liquid under pressure by the operator to move the table from beneath the ram.

'7. In a die spotting and tryout press, a vertically movable ram carrying a die, a horizontally movable table carrying a complemental die, selective means under control of the operator for moving the ram vertically or the table horizontally to position the die thereon in or out of alignment with the ram die, automatic means for sustaining the ram in any possible vertical position when not being moved and automatically releasing said ram for movement upon actuation of the selective means to move the same, and selective means for sequentially moving the table horizontally with the complemental die thereon to position the same in vertical alignment with the die on the ram for spotting and tryout operations or to position the complemental die at one side of the ram die to permit loading the complemental die on the table and reworking of the same subsequent to the spotting or tryout operation, automatically operable means for locking the table in the spotting position, and means for releasing the table locking element by actuation of the selective means to position the complemental die at one side of the ram die.

8. In a die spotting and tryout press, a vertically movable ram carrying a die, a horizontally movable table carrying a complemental die, a hydraulically actuatable means for moving the table with the die thereon toward or from a position in vertical alignment with the ram die, a hydraulically actuatable means for moving the ram and die thereon toward or from cooperative position with the table die, a hydraulic system by means of which fluid under pressure is suppliable to the hydraulically actuated means for moving the table or to the hydraulically actuatable means for moving the ram, and valve means under the control of the operator to supply liquid in said hydraulic system to the hydraulically actuatable means of either the ram or the table while maintaining the respective other liquid pressure applying means inoperative, and hydraulically actuatable means for locking the table from movement when the die thereon is in alignment with the ram die, said hydraulic means being a part of the said hydraulic system and automatically releasing the table for movement prior to application of liquid under pressure by the operator tomove the table from beneath the ram.

CLEMENT C. RICHARD.

CLIFFORD H. KAIN.