US1939960A - Die-casting machine - Google Patents

Description

Dec.- 19, 1933.y w. J. UURINGv Dm CASTING MACHINE Filed det. 9, 1929 y 5 Sheets-Sheet 1.

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w. JI DURING DIE CASTING IIACHINB rma opt. 9. 192e 5 Sheets-Sheet 3 I Patented Dec. 1 9, 1933 1,939,960 DIE-CASTING MACHINE William J. During,

Precision Castings Syracuse, N. Y., assigner to Company, Inc., Syracuse,

New York, a corporation of New York Application October 9f'1929. Serial No. 398,374

22 Claims.

This invention relates to certain new and useful improvements in die-casting machines.

` The main object of this invention is to produce an apparatus for making die casting which will be durable in construction, positively and quickly operated and easily controlled at a maximum degree of safety. In carrying out the foregoing 4objects of this invention, I have constructed a die-casting machine with a carriage which supports the die plates and die sections pivotally mounted on the frame of the apparatus in such a Vmanner that by moving the carriage about its pivot the casting forming die will be brought into and out of the casting position; to provide means whereby the pivotal movement of the carriage and the operation of the die supported thereby will be accomplished by liquid, preferably oil, under pressure; to provide a mechanism whereby the carriage and movable die section may be controlled simultaneously by the operation of a single valvemechanism; to so construct and mount the pressure pot on the frame of the apparatus that it may be connected to and be operated by the die supporting carriage to bring the pressure pot into and out of the casting ported by the carriage; to admit air to the pressure potthrough the supporting shaft therefor, for the purpose of forcing the molten metal into the die; and to provide a swiveljoint for the fluid pipe lines composed of nonexible pipes for connecting the carriage and die operating means with the iluid control valve and also for the air line to the pressure; pot which will permit the free pivotal movement of the'carriage and pressure pot and at the same time prevent leakage of liquid or air at the joints of said pipe lines. Othei. objects and advantages relating tothe details o the structure and the form and relation of the parts thereof will more fully appear from the following description taken in connection with the accompanying drawings in" which:-

Figure 1 is a top plane of an apparatus embodying the various features of this invention.

Figure 2 is a longitudinal vertical sectional View taken in the planeA of line 2 2, Figure 1.

Figure 3 is an end elevation of the rear or die supporting end of the apparatus.

Figure 4 is a'detail enlarged vertical section of the oil'control valve taken on line 4 4, Figure 2.

Figure 5 is a partial side elevation of the forward end of the machine illustrating the arrangement of the air line for the pressure pot. l liig-u're 6 is an enlarged detail vertical section position simultaneously with the die sections supof the air control valve taken on line 6 6, Figure 1.

Figure 7 is a detail section taken on line 7 7. Figure 2 showing the mounting for thecarriage,

operating plunger and the manner of connecting the oil line therewith.

Figure 8 is a detail vertical section through the pressure pot supporting shaft illustrating the manner of connecting the air taken on the line 8 8, Figure 1.

linetherewith Figure 9 -is a detailed horizontal sectional view taken on line 9 9, Figure 2, illustrating the toggle joint for operating the movable die plate.

Figure 10 is a sectional view similar to that shown in Figure 9 with Figure l1 is a detailed the toggle joint extended. vertical sectional View taken on line 11 11, Figure 2.

Figure 12 is a detailed. vertical section taken on line 12-12, Figure 2.

The apparatus as illustrated in the d awings consists of a base 1 having a furnace ch ber 2 the furnace chamber 2 in a plane above the melting pot 4 and is journaled in suitable bearings 7 which are adjustably lface of the cover which pass through secured to the upper surplate 3. by bolts or screws 3 elongated slots 8 provided in the base of bearing member 7 and are SCTEW threaded in the cover plate 3.

The bearing members 7 are positioned one at either side of the cover plate and are adjustably secured thereto for the the pressure pot laterally nozzle of said pressure pot with the sprue die section plish this ne adjustment of said pressure pot,

the bearing members 7 purpose of adjusting to bring' the delivery into proper alignment and in order to accomare each provided with a screw 7', said screws having their outer ends rotatably secured in a suitable upwardly extending boss 3' provided near the rear end of the cover plate 3 while the forward end of the screws 7 are screw threaded into respective bearing members 7 near the base thereof so that by turning the screws 7 the bearings? may be moved rearwardly or forwardly and thereby properly adjust the pressure pot relative to the sprue die section after which the bearings 7 may be securely clamped to the cover plate 3 by the The shaft 6, in this instance, is provided with a pair of collars 9 secured tol the rshaft and positioned one at either side of one of the bearing members 7 for preventing the longitudinal movement of the shaft 6 and, therefore, the corresponding movement of the pressure pot supported by said shaft.

The pressure pot 5, in this instance, is a substantially U-shaped member in vertical cross section having the upwardly extending leg and the lower portion thereof provided with a chamber 10 for receiving the molten metal. The outer end of the other or rearwardly extending leg is provided with a delivery nozzle 11 secured therein and connected with the chamber 10 by a duct 12 through which the molten metal is received by the chamber 10 from the melting pot 4 and through which the metal is delivered from the chamber 10 to the die in a manner hereinafter described.

To the upper end of the vertical leg of the pressure pot 5 is secured by bolts 13 an upwardly extending supporting bracket 14 which is rigidly secured to the horizontal rock shaft 6 intermediate the bearing members 7 to rotate with said shaft.

The bracket 14 is provided with a vertical opening 15 therein which extends downwardly from the shaft 6 with the outlet or lower end in registration with the pressure-pot chamber` 10.

The shaft 6 is provided with a longitudinal bore 16 arranged coaxially therein and extending from one end of said shaft inwardly to substantially the vertical plane of the opening 15 in the bracket 14.

The bore 16, inthis instance, is connected wfith said opening 15 by a bore 17y which extends dia'- metrically through the shaft 6. and 8.)

The bores 16 and 17 in the shaft 6 and the opening l5 in the bracket 14 are provided for introducing compressed air into the pressure pot 5 for forcing the molten metal into the die. The bore 16 in the shaft 6 may be connected to any suitable source for containing air under pressure as to a tank, not shown, and for this purpose,

have indicated in Figure 5 a conveniently controlled air line for introducing the airvinto saidA shaft and may, as shown, consist of a pipe line 18 adapted to be connected at one end to any suitable source of air supply while the other end, in this instance, is connected to a horizontally disposed'pipe 19 positioned in a plane below the shaft 6 which in turn is connected with a suitable air control valve 20 by means of a vertically extending pipe 21.

The pressure gage as 22 may be connected with the pipe 19 for registering the amount of air pressure in said pipe.

An auxiliary pipe line as 23 may be provided for reducing the air pressure when desired and may, as shown, lbe connected between the air line 18 and the vertically disposed pipe 21 intermediate the pipe 19 and the control valve 20.

A suitable pressure reducing valve 24 of any standard make may be connected in the line 23 intermediate the air -line 18 and vertical pipe 21 while a pair of hand operated control valves 25 and 25 may be provided in the line 23 one at either side of the pressure reducing valve 24.

The air line 18 is also provided with a pair of hand operated control valves 26 and 26' positioned one at either side of'the outlet opening for the line 23.

The control valve 20 may be of any standard (See Figures 2 n construction and, in this instance, consists of a vertically disposed body member 27 which is secured to one of the vertical sides 28 of the furnace member 2 in a plane below the shaft 6 by screws or bolts 29.

The body 27 is provided with a pair of spaced valve chambers 30 and 31 near the upper end thereof, each of said chambers 30 and 31 being provided with respective outlet chambers 32 and 33 positioned invertical alignment with and in a plane below said chambers and connected thereto by respective ports 34 and 35.

The ports 34 and 35 are each provided with respective control valves 36 and 36 for opening and closing said ports. The valves 36 and 36 are each provided with vertically disposed downwardly extending valve stems 37 which extend through respective outlet chambers 32 and 33 into a valve operating chamber 38 positioned below the outlet chambers 32 and 33.

The lower end of each of the valve stems 37 rest upon respective rock arms 39 which in turn are secured to a rock shaft- 40 at substantially right angles to each other for movement therewith, the rock shaft 40 being journaled in the side walls of the chamber 38 and extending rearwardly to a convenient position near the rear of the machine where it is provided with a suitable operating lever 48. The rearwardly extending end of the shaft 40 may be supported in any suitable manner as by spaced brackets 49 and 50 which are secured to the side of the frame as 1 and 28 respectively.

Valves 36 and 36 are normally yieldingly held in the closed position against their respective ports 34'and 35 by means of compression springs 41 coiled about the lower portion of said valve stems and positioned between the lower wall of the respective outlet chambers 32 and 33 and an annular plate or washer 42 secured to the lower end of the respective valve stems 37.

The outlet chamber 32 positioned at the lefthand side of the vcontrol valve frame 27 is connected with the valve chamber 31 positioned at the righthand sideof said frame by an annular -passage 43 while the outlet chamber 33 is provided with an exhaust port 44 which leads to the atmosphere.

The valve chamber 30, in this instance, is connected with the inlet pipe 2l while the valve chamber 31 is provided with an outlet pipe 45 which has the lower end connected to the upper portion of the case 27 and the other end connected to the horizontal shaft 6 by means of a swivel joint 46 and pipe 47 so that when-the rock shaft 40 is rocked by any convenient means, as by the lever 48 to lift the valve 36 in the charnber 30, the air will be admitted to the chamber 10 of the pressure pot 5 through the outlet chamber 32, passage 43, valve chamber 3l, pipe 45. swivel joint 46 and pipe 47 thence through the bores 16 and 17 in the Ashaft 6 and passage 15 in the bracket 14. The air, in this instance, as is customary in machines of this class is admitted under pressure to the chamber 10 of the pressure pot 5 for the purpose of forcing the molten metal from the pressure pot into the die after which the air pressure may be relieved in the chamber 10 by rocking the shaft 40 to permit the respective spring 41 to close the valve 36 in the chamber 30 which will cut off the supply of air and then by continuing the movement of the rock shaft 40, the arm 39 will be brought into contact with the valve stem 37 36' positioned in the valve chamber 31 to lift said of the valve f dotted lines and back valve and thereby open the port 35 which will release the air pressure in the pressure pot 5 by permitting the air to escape through the exhaust port 44 to the atmosphere.

The swivel joint 46 used in the air line to permit the free rocking movement of the pressure pot supporting shaft 6 is of a simple construction and has been found by actual practice to be particularly effective in preventing the escape of air and as shown in Figure 8 consists of a substantially tubular body kportion 51 Yhaving inwardly extending annular ange 52 intermediate the ends thereof and adapted to receive a rotatable tubular member 53 which is mounted in said flange co-axially therewith and provided at one end with an 'utwardly extending annular flange 54 adapted to engage one surface of the flange 52 on the body 51 for limiting the longitudinal movement ofthe member 53 in one direction, while a bushing 5 5 is removably secured in the adjacent end of the body 51 for retaining the member 53 in its proper position within said body and at the same time provides for its removal byiirst removing the bushing 55.

The bushing 55 is provided` with an internal thread for receiving one end of the air supply pipe 45 while the pipe 47 connecting the swivel jointy to the shaft 6 may be connected to the outer end of the tubular member 53 in any suitable manner as by pipe coupling 56.

A suitable packing is placed around the member 53 adjacent the flange 52 and is held in place by a packing nut 57 which is screw threaded in the opposite end of the body 51 to that at which the bushing 55 is placed. j

The pressure pot 5 is rocked about the vaxisof the shaft 6 to bring the delivery nozzle 11 from the loading position within the melting pot 4 which is normally below the level of the metal therein so that the pot 5 will be filled by gravity through said nozzle as indicated by full lines Figure 2 to the casting position as shown by again.

This rocking movement of the pot 5 is produced by the pivotal movement of the die carriage 59 which has the front or sprue die supporting plate as 60 connected to a pair of upwardly extending spaced arms 61 which are made integral withthe bracket 14 by a link 62.

The link 62, in this instance, is composed of a threaded member 63 which is pivotally connected at 64 to the upper horizontal edge of the front plate 60 and a second threaded member 65 which has the forward end thereof positioned between the upper ends of the arms 61 and pivotally connected therewith by a pin 66 carried by the upper ends of said arms and passing through a longitudinal slot 67 provided in the forward end of the member 65, the two threaded members 63 and 65 being joined together by a union nut as 68 having reverse threads and screw threaded on said members thereby forming a turnbuckle by the manipulation of whichI the degree of rocking movement of the pressure pot 5 may be governed.

The slot 67 in the member 65 is of such a length as to compensate for the different arc movements of the two pivotal connections of the link 62,`

as clearly illustrated in Figure 2.

'I'he carriage 59, in this instance, is composed of a. front or sprue diesupporting plate 60 and a similar cylinder supporting plate 70 secured in spaced relation thereto by a plurality of, in this instance, four parallel rods 71 secured to the front plate 60 preferably one near each corner thereof and extends rearwardly through corresponding holes provided in the plate 70, a portion of the rear ends of the rods 71 are threaded to receive a pair of lock nuts 72 positioned one on either side of the plate 70 for adjustably securing said plate in a4 predetermined position relative to the plate 60.

The plate 60, in this instance, is a relatively thin rectangular plate having the upper horizontal edge thereof provided with a pair of spaced outwardly extending lugs 73 intermediate the vertical sides thereof and between which one end of the link 62 is positioned `and to which said link is pivotally connected.

The lower horizontal edge of the plate 60 is provided with a pair of downwardly extending lugs or arms 74 adapted to co-operate with a supporting bracket 75 which is secured to the upper face of the base 1 by screws 76 intermediate the ends thereof for pivotally supporting the plate 60 and, therefore, the carriage 59, said plate 60 being pivotally mounted on the shaft 77 which passes through corresponding openings in the arms 74 and hasthe outer ends thereof secured in the bracket 75.

A second plate 78 for supporting the rear die section is slidably mounted on the rods 71 intermediate the plate 60 and the cylinder supporting plate 70 forcarrying said rear die section to and from the forward or sprue die section to cooperate therewith during the time the casting is being formed.

The plate 78 is a substantially rectangular plate having holes provided in the four corners thereof adapted to receive the guide rods 71 therethrough, said plate being provided with a rearwardly extending leg 79 positioned near the lower horizontal edge thereof and extending at substantially right angles thereto. The under or lower surface of the leg 79 is provided with a way 80 adapted to have slidably mounted therein a carriage operating block 81.

The block 81 is adjustably held in a predetermined position relative to the plate 78 by a screw member 82 which has one end rotatably secured to the rear vertical side of the block 81 by a hardened bushing 83 screw threaded in a suitable aperture in said rear side of the block 81 and provided with a centrally located hole adapted to receive the screw 82 therethrough, said screw being provided with an annular flange 84 at its forward end, said flange being positioned in an annular recess provided in the block 81 just ahead of the bushing 83 so that the flange head 84 is rotatably secured to the block 81 by the bushing 83.

The screw 82 extends some distance rearwardly from the block 81 and passes through a suitable hole provided in a lug 85 which is secured to the under side of the leg 79 at the rear end thereof. The screw 82 is screw threaded in the lug 85 so that by turning the screw, the block 81 may be moved rearwardly or forwardly along the way for properly positioning the carriage 59 when in a down or unloading position, the carriage being maintained in its down position by a link 86 pivotally connectedA at 87 to the front face of the block 81 and extends downwardly at an angle thereto with the other end pivotally mounted on a horizontal pin 88 which is secured to a rearwardly and downwardly extending arm 89 provided on the bracket 75 in a plane`in advance of ghe pivot 87 when the carriage is in its down posiion.

The carriage 59 is rocked about its pivot 77 to bring it from the down position to the up or casting position by means of a suitable uid, as oil under pressure, being admitted to a lift cylinder as 90 which consists, in this instance, of a pair of relatively long tubular telescoping members as 91 and 92. The outer member 91 which constitutes a ram has its upper end closed by a cap 93 secured thereto and its lower end is provided with a packing nut 94 screw threaded thereon and cooperates with a suitable packing as 95 to prevent leakage of fluid around the tubular inlet member or cylinder 92.

The inlet member 92 extends through a suitable opening in the nut 93 and into the inner chamber of the ram 91. The inlet 92, in this instance, is slightly lower than the ram member 91 and has its outer or lower end screw threaded into one side of a vertically disposed rock shaft 96 which extends transversely of the base 1 in a plane below the ram 91.

The -cap 93 of the ram 91 is provided with an upwardly extending lug 93 which is positioned in a slot 97 provided in the block 81 and is pivotally connected to said block by a pin 98 which passes through an aperture in the lug 93 and has its ends secured in the block 8l at opposite sides of the slot 97.

The rock shaft 96 is rotatably mounted in a pair of supporting brackets 99 positioned one at either end of said shaft and secured to the inner face of the longitudinal sides of the base 1 by bolts 100. The shaft 96 is provided with a longitudinal co-axial bore 101 which extendsfrom one end thereof inwardly to substantially the central portion of said shaft where it registers with the opening in the inlet member 92 of the lift cylinder 90 thereby forming a fluid passage through the shaft 96 inlet member 92 to the inner chamber of the ram 91 so that when fluid, as oil under pressure, is admitted to said chamber the ram 91 will/y be forced upwardly and thereby rock the carriage' 59 about the shaft 77 to bring said carriage to the casting position as illustrated by dotted lines in Figure 2.

As the carriage .59 is being moved from the down position to the up or casting position the movable die plate 78 will be carried forward along the guide rod 71 by the link 86 which swings about the shaft 88 and therefore will carry the block 81 and the plate 78, to which said block is secured. about the shaft 88 as a pivot as illustrated by dotted lines in Figure 2.

This longitudinal movement of the die supporting plate 78 is for the purpose of bringing the die section as A, Figure 2, carried thereby into cooperative relation with the die section as B secured to the front plate 60.so that said die sections will be in position to receive the metal when the delivery nozzle 11 of the pressure pot 5 registers with the receiving nozzle 102 which is secured to the substantially central portion of the front plate 60.A The link 86 is assisted in moving the die plate 78 to the casting position by a cylinder, a piston mounted therein and a toggle joint connecting said piston with the plate 78 in the following manner. The cylinder as 105 extends rearwardly from'the end plate 70 of the carriage 59 and is secured thereto in any suitable manner as by a plurality of, in this instance four, bolts or screws 106 which are arranged in spaced relation preferably at the corner of a square and have their inner'i'ends secured to the plate 70 and extend rearwardly therefrom through suitable holes provided in the head 107 of the cylinder and are provided with nuts as 108 screw threaded thereon for clamping the cylinderhead 107 and cylinder 105 to the plate 70. i

A piston 109 is reciprocallyA mounted within the cylinders 105 and is provided with a piston rod 110 which extends forwardly'lthrough a suitable opening in the plate andihas adjustably secured to the outer end thereof a sliding rack member 111 which is provided with rack teeth on its opposite vertical sides for operating the movable die plate 78.

For the purpose of securing the piston rod to the rack said rack is provided with an upwardly extending lug 112 having an aperture therethrough adapted to receive the rod 110 said rod being clamped thereto by suitable nuts 113 positioned on either side of the lug 112.

The under surface of the rack 111 is provided with a pair of spaced downwardly projecting portions 114 extending longitudinally thereof and having their adjacent inner faces beveled to correspond to the beveled opposite sides-of an upwardly and longitudinally extending guide portion 115 provided on the upper surface of the rearwardly extending leg 79 of the movable die plate 78 for guiding the rack in a rectilinear manner.

A pair of studs as 116 positioned one on either side of the rack 111 are secured or made integral with a forward vertical surface of the plate 70 and on each of head studs is pivoted a gear segment 117 meshing with the adjacent rack teeth. 105

Secured to each gear segment is an arm 118 Awhich swings with the gear segment and is connected by a lever 119 with a link 120 which is pivoted .to said lever, said link 120 being also pivoted on a rearwardly projecting lug 1.21 provided on the rear vertical face of the movable plate 78.

.These levers 119 and links 120 are provided with projections y122 and 123 respectively which when in the extended positon as illustrated in Figure 10 abut against each other and prevent the link and lever construction from passing beyond the dead center.

In other words the pivots of the arms 118, levers 119, links and pivots. on the plates 70 and 78 120 will be on a straight line when the die sections are in the closed or casting position and thereby locking the d'e sections/in this position and preventing any possibility of the die opening due to I the backward movement of the die supporting 125 plate 78 when 'the metal is forced into said die even though the/pressure in the cylinder 105 is for any reason/ released. To the lever 119 is pivoted at 12d/intermediate the ends thereof, an ejector head 125/which is supported by said levers and caused to "move longitudinally between the stationary plate 70 and movable die plate 78 but to aless degree than the said plate 78 by the action of the levers during the opening and closing on the die sections as illustrated in Figures 9 and v10.

This ejector head 125 is provided with a pair of spaced ejector rods 126 which-extend forwardly from the head 125 through the plate 78 into suitable apertures in the die section A with their 140 outer ends registering with a casting face of the mould cavity vin said die to form a part thereof when thedie ection is in the extended or casting position as s own in Figure 10 and when the die section iti/is` moved to the open position the ejector rods 126s-will extend beyond the casting face of the mould cavity due to the different degree of longitudinal movements of the die plate 78 and the ejectorhead 125 and thereby eject a casting 150 carried by said die. I

` diesection Ay may be operated in the cylinder 105 by any suitable fluid, preferably oil under pressure. The oil may be furnished from any suitable source as from an oil pump orpressure tank, not shown, through a pipe line as 130 to any suitable oil control valve 131 as illustrated in Figure 4, and which is mounted in a horizontal plane below the carriage 59 and at the rear of the lift cylinder 90 upon a bracket 131 which is secured to the longitudinal sides of the base 1.

The valve 131 in this instance consists of an inlet chamber 132 positioned in the lower portion of the valve casing 133 to which the inlet pipe `130 is connected. The inlet chamber 132 extends approximately from end to end of the valve casing 133 with the ends thereof terminating in an upwardly extending vertical portion 132 which are connected by ports 134 and 135 to respective control chambers 136 and 137 positioned intermediate the -end chambers 132', said control chambers 136 and 137 being connected with a common discharge chamber 138 located intermediate the control chambers and substantially midway between the ends of the casing 133 by respective ports 139 and 140.

The ports 134, 135, 136, 137, 139 and 140 are substantially circular in cross section and of the same diameter and are arranged in the same plane longitudinally of the valve casing 133 and adapted to receive therein a suitable piston as 141 which is provided with a piston rod 142 secured at one end thereof and which extends outwardly through the casing 133 of the valve and the adjacent side 1' of the machine at 143' with a suitable operating lever 143 which is pivoted at 144 to a bracket 145 secured to die casting machine.

The piston 141 is adapted to be moved longitudinally intherespective ports by the lever 143 for the purpose of connecting the control chambers 136 and 137 with the respective ends 132 of the inlet chamber 132 or with the discharge chamber 138 and for this purpose the piston 141 is provided with a reduced portion 146 -intermediate the ends thereof.

One of the ends of the piston as 147 is also reduced in diameter to permit vthe port 134 to be 'opened without an excessive movement of the piston 141. The control chambers 136 and 137 are each connected with an outlet pipe 148 and 149 respectively which are connected at their opposite ends to the front and rear end respectively of the cylinder 105.

'Ihe pi-pe 149 is also providedl with a pipe 150 connected therewith and which is also connected to one end of the rock shaft 101 provided for supporting the lift cylinder 90.

In order that the cylinder 105 carried by the carriage 59 may move. from the down position to the up or casting position and return without interfering with the supply of oil thereto the pipes 148 and 149 leading from the valve 11,31 to said cylinder are each carried upwardly from the valve 131 for a short distance and then are carried forward under the carriage 59 to substantially the plane of the plate 78 when the carriage is in its downposition and then rearwardly to the plane of the cylinder 105 and then'upwardly and into the respective ends of said cylinder.

In order that portions of each of the pipesA 148 and 149 may be rotated relative to other portions thereof to permit the swinging movement of the cyll der 105 I have provided at suitable places in said pipe lines a swivel joint 154 which the side 1f of the control chamber 136 with thel discharge chamsaid swivel joints 154 being constructedsubstantially the same as the swivel joint 46 provided in the air line leading to the pressure pot 5 and the construction of which has hereinbefore been explained. The pipe line 150 which leads from the pipe line 149- to the lift cylinder rock shaft 96 is also provided with one of these swivel jointsy 154 which is positioned in the pipe 150v where it is secured to the shaft 96 for the purpose of permitting the rotation of said shaft Without interfering with the remaining portion of the pipe line 1,50.

The discharge chamber 138 is connected with an outlet pipe 156 which may lead to the source of oil supply for the purpose of relieving the oil pressure in the different units when it is necessary to do so.

Operation With the machine positioned as shown in the drawings, ,that is, with the pressure pot 5 positioned with the nozzle 11 submerged in the metal contained in the melting pot 4, the air control valve 20 will be positioned as illustrated in Figure 6 with the inlet valve 36 closing the port 34 and with the' exhaust valve 36' in the opened position. u

The-die supporting carriage 59 will be in the down position and the oil control valve 131 will be set as illustrated in Figure 4 with the piston 141 moved outwardly to close the Apots 135 and 139 and open the post 134 and 140 thereby shutting off the supply of oil from the inlet chamber 132 toy the controlv chamber 137 and consequentially to the lift cylinder and the rear end of the .die operating cylinder 105.

The control chamber 136 will be in communication with the inlet chamber 132 which establishes oil pressure in the forward end of the cylinder 105 and thereby positions the piston 109 at the rear of the cylinder 105.

When it is desired to operate the machine it is only necessary for the operator to manipulate the lever 143 to move the piston 141,*inwardly thereby closing the ports 140 and 134 and' opening the ports 135 and 139 thereby establishing communication between the control chamber 137 and the inlet chamber 132 and connecting the ber 138. f

This positioning of the valve 141'wi1l supply oil under lpressure through the port 135, control chamber 137 and pipe line 149 and pipe line 150 and rock shaft 96 to the lift cylinder 90 which will cause the die supporting carriage 59 to rock aboutits pivot 77 to bring it to the casting position.

At the same time the oil under pressure will be delivered through the remaining Aportion of the pipe line 149 to the rear end of the die control cylinder 105 which will cause the piston 109 and the die supporting plate 78 to move forward simultaneously with the upward pivotal movement of the carriage 59. v

This forward movement of the piston and plate the die section B whereupon the toggle joint actuated by the rack 111 will have reached the extended position thereby locking the movable die 78 will continue until the die section A engages section A in the casting position in contact with the stationary die section B.

' As the plate 78 and die section A carried thereby reaches the casting position the ejector rods 126 will have been moved outwardly by the head 125 and the outer ends of said ejector rods will be in alinement with the casting face of the mould cavity of the die section A.

As the carriage 59 is being moved upwardly about the pivot 77 the link 62 connecting the die supporting plate 60 with the pressure pot arm 61 will move along the pin 66 until said pin engages the rear end of the slot 67 whereupon the pressure pot 5 will then be rocked about the axis of the supporting shaft 6 by the continued pivotal movement of the carriage 59 to bring the nozzle 11 from the submerged position in the melting pot 4 into the casting position in registration with the receiving nozzle 102 in the plate 60.

As the delivery nozzle 11 engages the receiving nozzle 102 the pressure pot 5 and the carriage 59 will be brought to a standstill in position for casting. u

Now by manipulating the lever 48`to rock the shaft 40 the exhaust valve 36 of the air control valve 20 will first be moved by theaction of the respective spring41 to close the pot 35 then by the continued rotation of the shaft 40 the inlet valve 36 will be lifted to open the pot 34 which will permit the air to enter from the pipe 21 through the chamber 30 passage 43, chamber 31 and pipe 45'to the interior of the rock shaft 6 and thence through the opening 15 in the bracket 14 to the pressure chamber 10 for forcing the molten metal contained in said chamber through the discharge nozzle 11 into the mould cavity of die sections.

Then by reversing the movement of the lever 48 theinlet 4valve 36 will be moved by the action of its respective spring 41 to close the port 34 thereby cutting off the supply of air to the pressure chamber 10, then by the' continued rotation of the rock shaft 40 the-exhaust valve 36' will be moved to open the port 35 which will release the air pressure in the chamber 10 by permitting the excess air to escape through the outlet chamber 33 and exhaust port 44. Now by manipulating the lever 43, of theoil control valve 131 to move the piston 141l outwardly from the diev position to the full position as shown in Figure 4 thereby cutting off the supply of oil to the lift cylinder and the rear end 0f the die control cylinder 105.

At the same time the port 134 will be opened which will establish communication between the control chamber 136 and the inlet chamber 132 which will admit oil under pressure through the pipe line 148 to the forward end of the cylinder which will force the piston 109 rearwardly thereby opening the die sections by the rearward movement of the die plate '78. The carriage 59 will now return by gravity to the down position by the oil which is in the rear portion of the cylinder 105 and in the lift cylinder 90 escaping through the control chamber 13'7, port to the discharge chamber 138 and return line During the rearward movement of the plate '7 8 the ejector rods 126 will be moved outwardly through the mould cavity in the die section A thereby ejecting the casting carried therein.

At the same time the pressure pot 5 will have been rocked about the axis of the shaft 6 by the pivotal movement of the carriage 59 to again bring the nozzle 11 into the submerged `position in the melting pot 4.

Although I have shown and particularly described the preferred embodiment of my invention I do not wish to be limited to the exact deta'ilrsof construction shown as various changes in the construction of the parts and in the arrangement thereof may readily be made without departing from the spirit of this invention as set forth in the impending claims.

What I claim is:-

1. A die-casting machine comprising in combination a movable die-supporting carriage, a movable pressure chamber adapted to contain molten metal mounted adjacent said carriage, a frame for supporting the carriage and pressure chamber means mounted on the frame for moving the carriage toward and from the pressure chamber, and additional means mounted independently of the frame and actuated by the carriage for moving the pressure chamber to and from said carriage.

2. A4 die-casting machine comprising in combination a movable die-supporting carriage, a

movable pressure chamber adapted vto contain molten metal mounted adjacent said carriage, a frame for supporting the carriage and pressure chamber means mounted on the frame for moving the carriage toward and Afrom the pressure chamber, and additional means mounted independently of the frame whereby the pressure chamber will be moved by the carriage to and from the carriage after an initial movement of said carriage.

3. A die casting machine comprising in combi nation, a movable pressure chamber adapted to contain molten metal, a die supporting carl riage pivoted to swing to and from said pressure chamber, means actuated by the carriage whereby said pressure chamber will be moved 'by the carriage to and from said carriage, and means for moving the carriage.

4. A die casting machine comprising in combination a pivoted pressure chamber adapted to contain molten metal, a pivoted die supporting carriage means for rocking the carriage to and from the pressure chamber, and means actuated by the carriage whereby the 'pressure chamber will be moved by the carriage to and from said carriage.

5. A die casting machine comprising in combination, a pressure chamber adapted to containmolten metal, a hollow rock shaft extended over said chamber and journaled at opposite sides thereof, means rigidly securing the chamber to said shaft adapted to convey iiuid from the shaft to said chamber, a die supporting carriage movable to and from the pressure chamber, means connecting the carriage and pressure chamber whereby the pressure chamber will be moved by the carriage to and from said carriage, means for moving the carriage, and means connected with the rock shaft for introducing air under pressure through said shaft to the pressure chamber.

6. A die casting'machine comprising in combination, a pressure chamber adapted to contain molten metal, a hollow rock shaft extended over said chamber and joumaled at opposite sides thereof, means rigidly securing the chamber to said shaft adapted toconvey fluid from the shaft to said chamber, a die supporting carriage movable to and from the pressure chamber, means actuated by the carriage whereby the. pressure chamberwill be moved by the carriage to and from said carriage, means for moving the carriage, and means'connected with the rock shaft for 'introducingair under pressure through said shaft to the pressure chamber.

'7. A die casting machine comprising in combination, a pressure chamber adapted to contain molten metal, a hollow rock shaft extended over said chamber and journaled at opposite sides thereof, means rigidly securing the chamber to said shaft adapted to convey fluid from the shaft to said chamber, a die supporting carriage movable to and from the pressure chamber, means connected with the carriage and pressure chamber whereby said chamber will be moved by the carriage to and from said carriage, means for moving the carriage, and means connected with the rock shaft for introducing air under pressure through said shaft to the pressure chamber.

8. In a die casting machine' the combination with a melting pot for containing molten metal of a pressure chamber secured for rocking movement to a shaft and provided with a delivery nozzle normally submerged below the surface of the molten metal for permitting said metal to flow into the pressure chamber, a die supporting carriage pivoted to swing to and from said nozzle, means connecting the carriage with the pressure chamber whereby said pressure chamber will be rocked by the movement of the carriage about the axis of said shaft to bring the nozzle from the submerged position in the melting pot into engagement with the carriage and return and means for moving said carriage.

9. In a die casting machine the combination with a melting pot for containingmoltenmetal of a pressure chamber secured for rocking movement to a shaft and provided with a delivery no-zzle normally submerged .below the surface of the molten meta-l for permitting said metal to flow into the pressure chamber, a die supporting carriage pivoted to swing to and from said nozzle, an adjustable link connecting the carriage with the pressure chamber for causing said pressure chamber to be rocked by the movement of the carriage about the axis of said shaft to bring the nozzle from the submerged position in the melting pot to engagement with the carriage and return and means for moving said carriage.

10. In a die casting machine the combination with a melting pot for containing molten metal of a pressure chamber secured for rocking movement to a hollow shaft and provided with a nozzle normally submerged below the surface of the molten metalJ for permitting said metal to flow into the pressure chamber, a die supporting carriage pivoted to swing to and from said nozzle means connecting the carriage with the pressure chamber whereby said pressure chamber will be rocked by the movement of the carriage about the axis of said shaft to bring th-e nozzle from the submerged position in the melting pot into engagement with the carriage and return, means connected with the hollow shaft for supplying air under pressure through said shaft to the pressure Chamberland means for operating the carriage.

11. In a die-casting machine in combination with a pressure chamber, of a die-supporting carriage pivoted to swing to and from said pressure chamber, and means for moving the carriage comprising a hollow rock shaft, and fluid-actuated means secured to said shaft to rock therewith and pivotally connected with the carriage, and means for supplying fluid under pressure through said shaft to the fluid-actuated means.

12. In a die casting machine in combination with a pressure chamber of a die supporting carriage pivoted to swing to and from said pressure chamber, a non-compressible fluid operated means for moving the carriage comprising a hollow ram pivotally secured to the carriage', a tubular inlet member mounted for longitudinal movement in'said ram and secured for pivotal movement to a hollow rock shaft and means for supplying fluid under pressure through said rock shaft to the interior of the ram. i

13. In a die casting machine in combination with a pressure chamber and a sectional die, of a pivoted die carriage having a stationary die plate and a piston and cylinder operated by a noncompressible fluid secured. in spaced relationl thereto, a movable die plate connected with said piston and mounted for reciprocative movement on the carriage intermediate the stationary plate and cylinder, non-compressible fluid operated means for moving the carriage comprising a hollow ram pivotally secured to the carriage, a tubular inlet member mounted for longitudinal movement in said ram and secured for pivotal movement to a hollow rock shaft and fluid control means connected with the rock shaft and said cylinder for simultaneously supplying fluid under pressure through said rock shaft to the interior of the ram and to the cylinder to move the carriage and die section to the casting position and return.

14. In a die casting machine in combinationvlo with a sectional die of a pivoted pressure chamber having a discharge nozzle, a pivoted die carriage having a stationary die plate and a pistonand cylinder operated by a non-compressible fluid secured'in spaced relation thereto, a movable die plate connected with said piston and mounted for reciprocative movement on the carriage intermediate the stationary plate and the cylinder, means connecting said pressure chamber with the carriage for moving the nozzle to and from said carriage, a non-compressible fluid operated means for moving the carriage comprising a hollow ram pivotally secured to the carriage, a tubular inlet member mounted for longitudinal movement in said ram and secured for pivotal movement to a hollow rock shaft and fluid control means connected with the rock shaft and cylinder for simultaneously moving the carriage die sections and discharge nozzle to the casting position and return.

15. In a die casting machine in combination with a sectional die and a melting pot for containing molten metal of a pressure chamber having a discharge nozzle normally submerged in the metal mounted for rocking movement on a hollow shaft, a pivoted die carriage having a stationary die plate and a piston and cylinder operated by a non-compressible fluid secured in spaced relation thereto, a movable die plate connected with said piston and mounted for reciprocative movement on the carriage intermediate the stationary plate and cylinder, means connecting said pressure chamber with the carriage for moving the nozzle to and from. said carriage, a non-compressible fluid operated means for moving the carriage comprising a hollow ram pivotally secured to the carriage, a tubular inlet member mounted for longitudinal movement in said ram and secured for pivotal movement to a hollow rock shaft, a fluid control means connected with the second mentioned rock shaft and cylinder for simultaneously moving the carriage, die section and discharge nozzle to the casting position and return and a separate control means connected withthe first mentioned rock shaft for supplying air under pressure through said shaft to the pressure chamber while in the casting position.

16.-':fIn a die casting machine, a pressure pot having a pressure chamber therein adapted to contain molten metal, and a delivery nozzle consides thereof, means rigidly securing the pot to the shaft and adapted to convey fluid from the lshaft to said pot and means secured to the rock shaft for supplying air under pressure through said shaft to the pressure chamber for forcing the metal from said chamber through the nozzle.

17. In .a die casting machine in combination with a'melting pot and a movable die supporting carriage of a pressure chamber secured for pivotal movement to a rock shaft, said chamber being provided with a delivery nozzle normally submerged in the metal and said shaft having a bore therein in communication with the pressure chamber, means actuated by the carriage for rocking said chamber to bring the delivery nozzle from the submerged position into casting relation with the carriage and return and means for supplying air under pressure through the shaft to the pressure chamber when the delivery nozzle is in casting relation with the carriage.

18. In a die casting machine in combination with a melting pot and a movable die supporting carriage of a pressure chamber secured for pivotal movement to a rock shaft, said chamber being provided with a delivery nozzle normally submerged in the metal and said shaft having a bore therein in communication with the pressure chamber, means actuated by the carriage for rocking said chamber to bring the delivery nozzle from the submerged position into casting relation with the carriage and return and air control means comprising an air valve and a swivel joint connecting said Valve with the rock shaft for supplying air under pressure through said shaft to the pressure chamber when the delivery nozzle is in casting relation with the carriage substantially as described.

' 19. In a die-casting machine in combination with a frame and a pressure chambermounted on said frame, of a die-supporting carriage pivotally secured to the frame to swing to and from said pressure chamber, said carriage having a stationary die plate secured thereto and a movable die plate mounted for reciprocative movement thereon, means for moving the carriage, and means pivotally connected with the frame and with the movable die plate for moving said plate toward and from the stationary die plate during the pivotal movement of the carriage.

20. In a die-casting machine in combination with a frame and a pressure chamber ,mounted on said frame, of a die-supporting carriage pivotally secured to the frame to swing to and from said pressure chamber, said carriage having a stationary die plate secured thereto and a movable die plate mounted for reciprocative movement thereon, means for moving the carriage, means pivotally connected with the frame and with the movable die plate for moving said plate toward and from the stationary die plate during the pivotal movement of the carriage, and additional means for automatically locking the movable plate in the forward position.

21. A diecasting machine comprising in combination a pressure chamber adapted to contain molten metal secured for rocking movement to a hollow shaft, a die supporting carriage movable to and from said pressure chamber, means actuated by the carriage whereby the pressure chamber will be moved by the carriage to and from said carriage, and means secured to the rock shaft for introducing air under pressure through said shaft to the pressure chamber.

22. In a die casting machine in combination with a pressure chamber and a frame, of a diesupporting carriage pivoted on the frame to swing to and from said pressure chamber, a non-compressible fluid operative means for moving the carriage comprising a. pair of telescoping members, one of said members being pivotally vsecured to the carriage and the other members pivotally secured to said frame, and means for supplying fluid under pressure to the interior of the members.

WILLIAM J. DURING.

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