US1960992A - Die-casting machine - Google Patents

Description

May 29, 1934.

W. J. DURING El AL DIE CASTING MACHINE Filed Jan. 19, 1951 62 u L 2' 4 55 3 m 43 I I4 4'3 4 4-3 J2 H E 3 I 1' f0 48 C 4s 94 4:! 9 4f.

5 Sheets-Sheet 1 w 'rlvfss U l/vvenron y 1934- w. J. DURlNG ET AL 1,960,992

DIE CASTING MACHINE Filed Jan. 19, 1931 5 Sheets-Sheet 2 .BY I

I W/TNESS' 3 Q W May 29, 1934. w J DURlNG ET AL 1,960,992

DIE CASTING MACHINE Filed Jan. 19, 19 3 Sheets-Sheet 3 I s 8 M m A25 1 llama m3 [/7 0 lfl/z l I Mo "0 0 i rn..,i I ,3 /3/ MB 6 x ll A 2/ 4 W J I IZH B ZI I/fi'NTIIR WIT/v5 -s 8 ma Patented May 29, 1934 I Q Q UNITED STATES PATENT OFFICE DIE-CASTING MACHINE William J. During, Syracuse, N. Y., and Nathan Lester, Cleveland, Ohio, assignors to Precision Castings Company, Inc., Syracuse, N. 1., a corporation of New York Application January 19, 1931, Serial No. 509,758

Claims. (Cl. 22-48) This invention relates to improvements in diethe top of the furnace to form a closure for the casting machines in which a vertically movable upper end of the heating chamber as 3 provided die section operates in conjunction with a fixed in the furnace.-

die section. One side of the furnace is provided with an One of the objects of this invention is to proopening 4 in communication with the chamber 3, duce an apparatus adapted to form castings from and is closed by a suitable cover or door 5 hingedaluminum, brass or other materials, wherein the 1y connected as at 6, or otherwise removably se- 'molten metal is fed by vacuum and atmospheric cured to the furnace for the purpose of permitpressure from a crucible or melting pot into a ting the opening of the chamber3 and the placing suitable delivery or pressure pot. of a crucible or melting pot as 'l in said chamber. 65

Another object is to provide means for auto A suitable means may be provided for melting the matically controlling the flow of the molten metal metal contained in the melting pot I, such as the into the pressure pot for each casting operation gas burner 8 built at a convenient location in the to substantially the amount required to fill the wall of the furnace 1. I

Upon the cover plate 2 is mounted a fixed die 70 A further object is to provide means for ejectplate 9 which, in this instance, is maintained in ing the molten metal from the pressure pot into substantially parallel spaced relation with the a suitable die or mold under very high pressure. cover plate by means of integral downwardly pro- A still further object is to provide means whereiecting sides 10. The die plate 9'is fixedly secured by the surplus metal remaining in the delivery to the cover plate 2 by means of bolts or screws 75 pct, after a casting has been formed, will be 11 which pass through openings in laterally automatically ejected from the delivery pot into formed flanges 12 provided at the lower edge of the melting pot as the casting is being ejected the sides 10 and screw-threaded in the cover from the die cavity. plate 2.

$ Still another object is to provide simple and The fixed die plate 9, in this instance, extends 89 eflicient means whereby the various moving parts over substantially the entire surface of the cover of the apparatus may be easily and positively plate 2 and is provided at one end thereof with controlled by the operation of a single lever. a downwardly projecting wall or flange 13 adapted Other objects and advantages will more fully to form one head plate of a cylinder 14 which is l appear from the following description, taken in positioned adjacent the outer face of the wall 13 connection with the accompanying drawings in to extend outwardly therefrom in a horizontal which: plane.

Figure 1 is a front elevation of an apparatus The outer end of the cylinder 14 is closed by embodying the various features of this invention, a cover plate 15 which, together with the cylinder certain parts being shown in section. The appa- 14, are secured to the wall 13 by means of suitable ratus is illustrated in the casting position. bolts or screws lfi which pass through suitable Figure 2 is a vertical longitudinal sectional openings in the plate 15 and are screw-threaded view of the apparatus shown in Figure 1, with the in the wall 13. A piston 17 is mounted for lon-v various parts illustrated in the inoperative or gitudinal reciprocative movement in the cylinder 10i casting ejecting position. 14 and is provided with a piston rod 18 which ex- 95 Figure 3 is an enlarged detail horizontal sectends outwardly from the cylinder 4 through a tional view taken substantially on line 33, Figsuitable opening 19 provided in the wall 13 and ure 1. has the outer end thereof connected by a link Figure 4 is an enlarged detail sectional view 20-to a plunger 21 mounted for longitudinal retaken on line 4-4, Figure 2. ciprocative movement in the pressure chamber .100

Figure 5 is an enlarged vertical longitudinal 22 formed in a pressure or delivery not 23. sectional view through the control valve, and The link 20 is removably connected with the taken subst n i lly li Figure 1. piston rod 18 and the plunger 21 for the purpose Figure 6 is a vertical sectional view taken of permitting the link .tobe quickly and easily 60 through the vacuum control valve in the plane removed for the purpose of substituting links of 1 of the line 6--6, Figure 5. greater or less lengths.

The apparatus, as illustrated in the drawings, The delivery pct 23, in this instance, is secured consists of a furnace 1 formed of any suitable to the underface of the fixed die plate 9 in any material. The furnace is provided with a cover suitable manner as by screws 24. The pressure plate 2 secured in any well-known manner to chamber 22 in the delivery pct 23 has the side no 1 walls thereof disposed in a substantially vertical plane, while the end thereof adjacent the cylinder 14 is closed by the plunger 21.

It may now be understood that the molten metal contained in the chamber 22, may be forced under very high pressure by the action of plunger 21 into the die cavity. For instance, by supplying fluid, as oil, to the outer end of cylinder 14 at 3,000 pounds pressure per squareinch and with the piston 17 four inches in diameter the pressure exerted on the plunger 21 is approximately 37,500 pounds per square inch, and with the plunger formed 1% inches square, it follows that the plunger normally exerts approximately 12,250 pounds per square inch on the molten metal as the die cavity becomes filled.

The lower wall of the delivery pot 23 is provided with an aperture or port 25 extending therethrough with the outer side surface thereof substantially in alignment with the inner end of the plunger 21 when said plunger is in its extreme outer position. 7 a

A feed tube 26 is secured to the lower face of the delivery pot 23 by means of flanged clamps 27 engaging a flange 28 provided at the upper end of the feed tube 26 and secured by bolts 29 or their equivalent to the delivery pct 23. The feed tube 26 extends downwardly from the delivery pct 23 in a vertical plane through a suitable opening 30 provided in the cover plate 2 and has the upper end thereof in registration with the port 25 and the lower end positioned to extend some distance into the melting pot 7.

The forward or outer end of the chamber 22 is in communication with an aperture or nozzle 32 formed in a nozzle block 33 positioned in a suitable opening formed in the fixed die plate 9 and which is in communication with a gate or sprue die opening 34 provided in the fixed die section 35 secured by any suitable means as screws 36 to the upper face of the die-supporting plate 9.

The die section 35 forms one portion of a die member 38, the other portion of which, as 39, is secured in any suitable manner to a movable die supporting plate 40 slidably mounted for longitudinal reciprocative movement upon a plurality of, in this instance four, vertically disposed spacing rods 41. I

These rods 41 are each disposed at substantially the corner of an imaginary square and have the lower ends thereof secured to the fixed die supporting plate 9, while the upper ends of these rods are screw-threaded and support a cylinder plate 42 which is adjustably secured to the rods 41 by means of nuts 43 screw-threaded on the rods 41 and positioned one adjacent the upper and lower face of said plate.

The movable die-supporting plate 40 is operably connected with the cylinder plate 42 by a toggle mechanism 44 which, in this instance, consists of a pair of links 45 pivotally connected at 46 in transverse spaced relation to respective upwardly extending lugs 47 secured to or made integral with the upper face of the movable die plate 40. The outer ends of these links 45 are pivotally connected at 48 with one end of respecarms in spaced relation during the operation thereof.

Each of the links 51 have the free or outer edges thereof made concentric with the respective pivots 52 and provided with gear teeth 55 which are adapted to mesh with respective sides of a double-faced rack member 57 which is adjustably secured to one end of a piston rod 58 by means of nuts 59 screw-threaded on the end of the rod 58 and positioned one adjacent opposite faces of an outwardly extending lug 60 secured to or made integral with the rack 57.

The piston rod 58 extends upwardly in a vertical plane from the rack 57 through asuitable opening 61 provided in one of the end plates 62 of a cylinder 63 and is secured to a suitable piston 64 mounted for longitudinal reciprocative movement in the cylinder 63.

The cylinder end plate, 62 is mounted upon the upper end of upwardly extending bracket 42' secured to or made integral with the cylinder plate 42. The outer or upper end of the cylinder 43 is also provided with an end plate 65 which, to-= gether with the cylinder 63 and end plate 62, are securedto the bracket 42' and to each other by means of bolts or screws 68 which pass through registering openings in the end plates 61 and 65 and are screw-threaded in the upper end of the bracket 42'.

Each of the links 51, in this instance, is provided with a web or lug 51' adapted, when the toggle mechanism is in the collapsed position, to engage the outer edge of the adjacent portion of the respective arms 49 for limiting the collapsible movement of the toggle, as illustrated more clearly in Figure 2.

The adjacent ends of the links 45 and arms 49 are each provided with abutting shoulders 45' and 49 respectively, adapted when the toggle mechanism is in the extended position, to engage each other and assist in maintaining the pivots 46, 48, 54, 50 and 52 in the same straight line.

The manipulation of the toggle mechanism 44, is for the purpose of' moving the die section 39 into and out of casting relation with the other die section 35, and this is accomplished through the medium of the rack 57 as it is moved vertically by the piston 64 which. causes corresponding rocking movement of the co-acting links 51.

This rocking movement of the links 51 will rock the arms 49 about their pivotal connection 54 with the head 55 and thereby move the links from the extended position to the collapsed position or vice versa, which in turn, will cause a corresponding vertical movement of the movable die plate 40 and die section 39.

Secured to the cross head 55 in any suitable manner as by screws 67 is a plate 68 which has secured thereto a pair of downwardly projecting rods 69 which extend through suitable openings in the die-supporting plate 40 and have their lower ends positioned in a recess 70 formed in the underface of the die plate 40 and secured to a second ejector plate '71 similar to the plate 68.

To the ejector plate 71 is secured a plurality of, in this instance two, ejector pins 72 which extend downwardly from the ejector plate 71 through suitable openings in the die section 39 and have, when the die sections 39 and 35 are in casting relation with each other, the inner ends thereof in registration with the die cavity to form a smooth continuous surface therein, as illustrated more clearly in Figure 1.

The ejector pin 72, being connected with the cross head 55, will travel a less distance during the upward movement of the movable die plate 40 than the die section 39 due to the pivotal ac--' tion of the arms 49 and links 45 which will cause the lower ends of the ejector pins 42 to extend below the lower face of the die section 39 when said section is in its extreme upper position, and thereby cause the ejection of the casting from the die section during said upward movement, as illustrated in Figure 2.

The die section 39 is also provided with an annular recess 74 extending inwardly from the upper face thereof to within a relatively short distance of the wall of the die cavity, and a second annular recess as 75 smaller in diameter than the recess 74 and which extends from the recess '74 to the die cavity. In these recesses 74 and '15 is slidably mounted, a pin 76 which has the upper end thereof provided with an enlarged,annular sage 34 when the die sections 35 and 39 are in casting relation.

The lower end of the pin 76 has, in this instance, a conical formation adapted to extend a short distance into the gate 34 but is of slightly less diameter than said gate so as to provide a very slight passageway between the wall of the gate and the adjacent portion of the pin '76, for

the purpose of permitting passage of air between said pin and walls of the gate when a vacuum is produced in the die cavity, but at the same time, prevent the passage of molten metal past-the end of the pin 76 due to the solidifying of the metal as it enters between the pin-and gate due to the,

relatively small passageway therebetween, as will be hereinafter more fully explained.

The vacuum in the die cavity may be produced in any suitable manner when the die sections 35 and 39 are in casting relation, and for this purpose, the flxed die section 35 is provided with a pair of passages 80 which extend inwardly from one side of the die in parallel spaced relation, and have the inner ends thereof terminating in an upwardly projecting portion or port 80' in communication with the upper face of the die between the die cavity and the outer face of said die.

The upper face of the fixed die section 35 is also provided with a slight recess as 81 extending between respective ports 80' andthe adjacent portion of the die cavity so that when the die sections 35 and 39 are in contact with each other, the recesses 81 will form a very shallow passage between the respective ports 80' and the die cavity for permitting the air to be drawn therethrough in producing the vacuum in the die cavity and pressure chamber 22.

The outer ends of each of the passages 80 are connected with a conduit 82 which extends outwardly therefrom a short distance and is connected with a common conduit 83, which is connected at the opposite end thereof with a suitable air' control valve. 84 adapted to automatically connect the die cavity with a suitable vacuum-' producing means during the operation of the casting apparatus, in a manner hereinafter more ing in the chamber 22 after the casting has been formed, will be collectedat the forward end thereof and it is, therefore, necessary that this surplus metal be removed from the pressure cham- ;ber before another casting is formed, and for this purpose, the forward or inner end of the plunger 21. is provided with a vertically disposed dove-tail slot 86 in which the metal in the pot will collect during the casting operation and after the casting has been formed, the metal remaining in the pot will solidify due to the small quantity thereof, and thereby be connected with the plunger 21 so that as the plunger 21 is moved outwardly to its original position, the metal remaining in the chamber 22 will be drawn outwardly with the plunger and broken from contact with the sprue at its smallest diameter, that is, where the aperture 32 communicates withv the pressure chamber 22.

As the plunger 21 reaches its outer position, the forward end thereof containing the dove-tail slot will be in registration with the port 25 provided in the lower wall of the delivery pct 23. The solidified metal connected with the plunger 21 may now be forced downwardly through the port 25 and feed tube 26 into the melting pot '7, and for this purpose, a suitable ejector plate 87 adapted to be received in the slot 86, is mounted for vertical reciprocative movement in a slot 88 provided in the fixed die plate 9 at one side of the die 35 and in registration with the slot 86 when the plunger 21 is in its extreme outer position.

The upper end of the ejector plate 87 is posi tioned, in this instance, in a slot 89 formed in the upper face of the fixed die plate. 9 and which extends longitudinally of said plate in an outward direction from the vertical ejector plate slot 88, and has the outer vertical face thereof provided with .a series of gear teeth 90 adapted to have meshing engagement with similar teeth formed on one end of a rock arm 91 which is rotatably mounted upona pin 92 which extends through an opening provided in the arm 91 intermediate the ends thereof and has its ends secured in the opposite walls of the slot89.

The opposite or outer end of the arm 91 is also provided with gear teeth adapted to have meshing engagement with similar teeth provided on the lower end of an upwardly extending vertically disposed ejector rod 94.

The lower end of the rod 94 is slidably mounted in a suitable aperture 95 provided in the upper face of the plate 9 adjacent the outer end of the slot 89, while the upper end of the rod 94 extends upwardly through a suitable opening provided in an outwardly extending horizontally disposed arm 96 secured to or made integral with the adjacent vertical side of the movable die-supporting plate 40, as illustrated more clearly in Figure 2.

Two sets of nuts as 97 are screw-threaded upon the rod 94, the sets being positioned at opposite sides of the arm 96 in such a relation to the movement of said arm as to cause the arm to produce the desired rocking movement of the rock arm 91 and the ejector plate 8'7 as the mov able die plate40 approaches the limit of its upward or downward movement. In other words, 0

when die sections 35 and 32 are in casting relation, the lower positioned nuts 9? are so ar raimed on the rod that the arm 93 connected with the plate so will cause the rod or to be in its lowermost position which will cause the ejector plate 87 to be in its extreme upper position with the lower end face thereof in registration with the lower face of the fixed die plate 3 so as to form a smooth continuous surface over the plunger 21 for permitting said plunger to moved inwardly for ejecting the molten metal from the pressure chamber 32.

The distance between the upper and lower positioned nuts 9'? is such that as the movable die supporting plate 10 approaches the limit of its upward movement and after the plunger 21 has been returned to its extreme outer position, the arm 86 will engage the upper positioned nuts 97 to cause the upward movement of the rod 94 and, therefore, the downward movement of the ejector plate 87, due to the action of the rock arm 91 which will force any metal connected with the inner end of the plunger 21 from contact with said plunger and through the port 25 and feed tube 26 into the melting pot 7 where it will again become molten as it drops into the molten metal contained in the pot 7.

Each of the pistons 17 and 64 is actuated in its respective cylinders Hand 63 by fluid, as oil under pressure, and for this purpose, each of these cylinders is connected by respective conduits with a suitable control valve 100 which, in turn, is connected with a suitable source for supplying fluid under pressure, not shown. For instance, cylinder 14 1s provided with ports 1G1 and 102 provided in the end plate 15 and wall 13 respectively andwhich are in communication with respective ends of said cylinders.

The ports 101 and 102 have their outer ends connected by respective conduits 103 and 104 with the control valve 100. Likewise the cylinder 63 is provided with a pair of ports 105 and 106 formed respectively in end plates 62 and 65 with the inner ends thereof in communication with the adjacent ends of the cylinder 63. The outer ends of these ports are connected by respective conduits 107 and 108 with the. control valve 100.

The control valve 100, in this instance, consists of a substantially rectangular body member 110 secured in any suitable manner as by screws 111 to the upper face of a bracket 112 secured to or made integral with one of the vertical walls of the furnace 1.

The valve body 110 is provided with a cylindrical opening or chamber 113 which extends longitudinal therethroug'h. The ends of the chamber 113 are closed by suitable end plates 114 and 115 secured by screws 116 or their equivalent to respective ends of the body 110. The upper portion of the body 110 is provided with an inlet port 117 which has the inner end thereof communicated with the chamber 113 by means of an annular recess' 118 formed in the wall of the chamber 113.

The outer end of the port 117 may be connected in any suitable manner as by a conduit 113 with the source of fluid supply. The body 110 is also provided with a plurality of, in this instance four, control ports 120 arranged in pairs with a pair positioned at each side of the inlet port 117.

These control ports 120 are connected with the chamber 113 by respective annular recesses 121 formed similar to the recess 118 in the wall of the chamber 113 and spaced equal distances from each other and from the recess 118 so as to form respective inwardly projecting flanges 122 he chamber 113, said flanges being 1 J equal width.

the chamber 113 adjacent the cover plates 11% and 125 are also provided with annular recesses 123 which are in communica- The piston 126 is provided near the ends thereof with outwardly extending annular flanges 12; of substantially the same diameter as the chamber 113 and having a width eoual to the width of the chamber flanges 122 so as to form a fluid-tight connection between the piston and the wall of the chamber 113 where these flanged portions 122 occur for the purpose of separating certain groups of recesses 121.

The distance between the piston flanges 12? in this instance, is equal to the distance between the outer face of the outer positioned recess 121 of the chamber 113 and the outer face of the recess 118 positioned at the opposite side of said recess to that at which the first-mentioned recess 121 occurs.

The piston 126 is moved longitudinally through the chamber 113 by means of a piston rod 128 which has one end thereof connected with said piston and extends outwardly through a suitable opening as 129 provided in one of the end plates as 115 and has the outer end thereof connected with a suitable rack member 130 slidably mounted in a suitable guide 131 provided in a bracket 132 secured to the valve-supporting bracket 112.

This rack 130 may be actuated by any suitable means such as a lever 133 pivotally connected intermediate its ends as at 134 to the bracket 132 in a plane above the rack 130. The lower end of the arm 133 is made concentric with the pivot 134 and provided with gear teeth 135 adapted to have meshing engagement with the teeth of the rack 130. The lever 133 may be maintained at predetermined positions for the purpose of maintaining the piston 126 in certain relation with the control ports and for this purpose, the lever 133 is provided with a plunger 136 slidably mounted in a suitable slot 137 provided in the lever 133 and adapted to engage in a slot 133 provided in the upper portion of the bracket 132 above the pivot 134 and made concentric with said pivot.

The slot 138 is also provided with a plurality of, in this instance three, radially disposed grooves or notches 139 formed in the upper periphery thereof adapted to receive a lateral projection formed on the plunger 136. The plunger 136 may be .yieldingly maintained in contact with the notches 139 by any suitable means such as a rod 140 having one end connected with said plunger and the other end extending upwardly through a suitable opening in the lever 133 and terminating in an inwardly extending annular recess 141 provided in the upper end of lever 133 and connected with a suitable nut 142.

A spring 143 is positioned in the recess 141 between the nut 142 and the lower end of said recess for yieldingly maintaining the plunger 136 in its upper position in contact with the groove 139.

The vacuum control valve or, in this instance,

is operably connected with the piston rod 126 by means or a crank arm 145 having one end thereof connected with a stem 146 which is connected to or made integral with the valve rotor 147 while the other end thereof is operably connected with a grooved collar 148 secured to the rod 128 so that when the piston 126 is moved in the chamber 113 for causing the piston 64 to be moved downwardly for the purpose of bringing the die section 39 into casting engagement with the die section 35, the valve 84 will be opened for the purpose of connecting the die cavity with the means for producing a vacuum in the die cavity and pressure chamber 22, and when the piston 126 in the chamber 113 is again moved for the purpose of admitting fluid to the head end of the cylinder 14 to cause the piston 17 to be moved inwardly in the cylinder 14 'to cause the plunger 21 to force the molten metal from the pressure chamber 22 into the die cavity, the valve 84 will be closed for cutting oil the connection between the die cavity and the vacuum-producing means.

It will be noted by referring to Figure 5, that the conduit 103 for the cylinder 14 is connected with the control port 120 positioned farthest from the inlet port 117 adjacent the outer end of the chamber 113 and that the conduit 104 for the cylinder 114 is connected with the control port 120 adjacent the inlet port 11! and positioned at the opposite side thereof tothat at which the port for the conduit 103 is located.

The conduit 107 for the cylinder 53 is connected with "the control port 120 positioned farthest from the inlet port 117 and adjacent the inner the control valve 100 in the position illustrated in Figure 5 and the vacuum control valve 84, as illustrated in said Figure 5, in the closed position, it is evident that the rod ends of each oi the cylinders 14 and 63 are connected by the control valve 100 with the inlet conduit 119 and, therefore, with the source of fluid supply under pressure and that the head ends of these cylinders are connected by the respective conduits 103 and'l03 with the exhaust conduit 125.

"Now, by manipulating the lever 133 to move the valve piston'126 inwardly the distance between two adjacent control ports 120, the rod end of the cylinder 63 will be connected with the exhaust conduit 125 while the head end of said cylinder will be cut oil from the exhaust conduit 125 and connected with the inlet conduit 119 which will admit fluid under pressure to the upper end of the cylinder 63 and cause the downward movement of the piston 64 contained there- This downward movement of the piston 64 will cause the toggle mechanism 44 to be moved to the extended position which will carry the movable die-supporting plate 40 and die section 39 connected therewith downwardly to bring the die section 39 into casting relation with the fixed die section 35, as illustrated in Figure 1. At the same time, the vacuum control valve 84 will be opened and connect thedie chamber and there- As the molten metal contained in the melting pot I must be maintained above the inlet to the feed tube 26 or substantially at a level indicated by the dotted line X, the molten metal contained in the pot '7 will be forced by atmospheric pressure upwardly through the feed tube 26 into the pressure chamber 22 and as the chamber 22 becomes fllled with the molten metal, the metal will gradually rise until it reaches the stud '76 and as the metal flows between the stud 76 and the wall of the gate 34, the metal will become solidifled therein due to the relatively small passageway, as hereinbeiore described, thereby cutting oif the vacuum and discontinuing the flow or metal upwardly through the i'eed tube 26.

As this takesplace, the lever 133 is again manipulated to cause the i'urther outer movement of the piston 126 in the control valve 100 for the purpose of disconnecting the rod end of the cylinder 14 with the fluid under pressure and connecting it with the exhaust conduit 125 and connecting the head end 01' saidcylinder with the source of fluid supply and, at the same time, close the vacuum control valve 84 for the connection of the die cavity of the vacuum-creating means. This will cause the inward movement of the piston 1'7 and plunger 21 connected therewith, and as the part 25 in the delivery pct 23 is closed by the plunger, the remainder of the molten metal contained in the pressure chamber 22 will be forced under very great pressure upwarde 1y through the gate 34 which'will cause the stud 76 to be moved upwardly against the action of the spring '17 and permit the molten metal to flow into the die cavity.

Owing to-the relatively narrow depths of the recesses 81 connecting the die cavity with the vacuum ports 80', the'molten metal flowing into said recesses fromthe. die cavity, will immediately become solidified and thereby close said recesses and prevent the molten metal from flowing into andclosing the vacuum-ports 80. As the die cavity becomes filled, the surplus metal remaining in the pressure chamber 22 will become solidifled and connected with the plunger 21, due to the metal, engaging the dove-tail slot 86 in said plunger.

The lever 33 which is, at this time, in the position illustrated by dotted lines in Figure 5, will now be moved in the opposite direction from the previous movement to return-the piston 126 to its original position at the inner end of the chamber 113. This inward movement 01 the piston 126 will first reverse the fluid pressure in the cylinder 114 which will causejthe outward movement 130 of the piston l'l'and the return of the plunger 21 to its original outermost position in the pressure pct 22 with the inner end of said plunger in registration with the port 25 and feed tube 26.

' As this movement of the piston 126 is continued, the rod end of the cylinder 63 will be connected with the source of fluid pressure which will cause the upward movement of the piston 64 contained therein and the consequent moving of the toggle mechanism 44 from the extended to the collapsed position which will cause the separation of the die sections 35 and 39 and the ejection of. the casting from the die cavity by the action of the ejector pin '72 in the manner hereinbefore described. I

As the die section 39 and movable die-supporting plate 40 approaches its extreme upper position, the arm 96 will engage the upper positioned nuts 9'1 and move the rod 94 upwardly thereby rocking the rock arm 91 about the pivot 92 and forcing the ejector plate 87 downwardly to the position illustrated in Figure 2, thereby causing the surplus solidified metal connected with the plunger 21 to be moved downwardly out of engagement with the slot 86 and thru the port 25 and feed tube 26 into the melting pot 7.

As the control valve is again manipulated for repeating this cycle of operations, the ejector plate 3'7 will again be returned to its uppermost position by the arm 96 coming in contact with the lower positioned nuts 97 as the plate to and die section 39 connected therewith, approach their lowermost position with the die section 39 in contact with the die section 35.

It will be noted that the vacuum control valve 84 is so operated, that when the die sections are in contact with each other, the valve will be in the open position for connecting the die cavity with the vacuum-producing means, and 'that when the piston 126 is moved in the control valve 100 for causing the upward movement of the piston 64 to raise the movable die section 39 out of engagement with the section 35, the valve 84 willbe closed by the action of the rod 128 upon the arm 145, thereby closing the vacuum line as the die cavity is opened. The vacuum line will thus remain closed until the piston 126 is again operated to cause the closing of the die 38 when the valve 84 will again be opened for connecting the closed die cavity with the vacuum-producing means.

Although there is shown and described the preferred embodiment of this invention, it is not desired to be limited to the exact form and relation of the parts shown, as various changes may readily be made without departing from the spirit of this invention as set forth in the appended claims.

We claim:

1. In a die-casting machine in combination with a die member and a melting pot, of a pressure chamber mounted in casting relation with the die member, metal-conveying means connecting the chamber with the interior of the pot,

pressure means connected with the die adapted to produce a vacuum in the die and chamber to cause molten metal contained in the pot to fiow into the pressure chamber, and means for ejecting the metal from the chamber into said die.

2. In a die-casting machine the combination with a die member and a melting pot, of a pressure chamber mounted in casting relation with the die member, metal-conveying means connecting the chamber with the interior of the pot, pressure means adapted to cause molten metal contained in the pot to fiow into the pressure chamber, means for automatically limiting the amount of metal flowing into the chamber, means for ejecting the molten metal from the chamber into the die cavity to form a casting, and

separate means for ejecting the surplus metal re-- casting is formed from said chamber into the pot.

4L In a die-casting machine the combination with a die member and a melting pot, of a pres-'- sure chamber mounted in casting relation with the die, means for feeding molten metal from the weapon pot into said chamber, a plunger mounted in the chamber, means for actuating the plunger to eject the moiten metal from the chamber into the die to form a casting, and means for ejecting the sur- 7 plus metal remaining in the chamber after the casting is formed from said chamber into the pot.

5. In a die-casting machine the combination with a die member, and a melting pot, of a pressure chamber mounted in casting relation with the die, means for feeding molten metal from the pot into said chamber, a plunger mounted for reciprocative movement in the chamber and normally positioned at one end thereof, means for feeding molten metal from the melting pot into the pressure chamber, means for reciprocating the plunger to eject the molten metal from the chamber into the die to form a casting, said plunger having means adapted to engage the surplus metal remaining in the chamber after the casting has been formed to cause said surplus metal to move with the plunger to the normal position thereof, and means adapted, when the plunger is in the normal position, to eject said surplus metal from the chamber into said pot.

6. In a die-casting machine the combination with a die member and a melting pot, of a pressure chamber mounted in casting relation with the die member, metal-conveying means connecting the chamber with the interior of the melting pot, means adapted to produce a vacuum in the die cavity and chamber, for causing molten metal contained in the pot to fiow into the pressure chamber, and means connected with the die for limiting the amount of metal flowing into the chamber.

7. In a die-casting machine the combination with a die member comprising fixed and movable sections, and a melting pot, of a pressure chamber mounted in casting relation with one of said die section's, metal-conveying means connecting 1 the chamber with the interior of the melting pot, a vacuum line connected with one of the die sections adapted to produce a vacuum in the die cavity, pressure chamber and metal-conveying means for causing molten metal to flow into the chamber when the die sections are in contact with each other, and means for automatically closing said vacuum line when the die sections are separated.

8. In a die-casting machine the combination with a die member comprising fixed and movable sections, and a melting pot, of a pressure chamber mounted in casting relation with one of said die sections, metal-conveying means connecting the chamber with the interior of the melting pot, means adapted to produce a vacuum in thedie cavity, pressure chamber and metal-conveying means for causing molten metal contained in the pot to fiow into the pressure chamber, means for automatically limiting the amount of metal fiowing into the chamber, means for ejecting the molten metal from the pressure chamber into the die to form a casting, means for ejecting the casting from the die sections, and means for automatically ejecting the surplus metal remaining in the chamber after the casting has been formed from the chamber into the pot as the casting is ejected.-

9. In a die-casting machine the combination with a die member comprising fixed and movable sections, and a melting pot, of a pressure chamber mounted in casting relation with one of said sections, means for feeding the molten metal from the pot into said chamber, means for ejecting the molten metal from the chamber into the Ill Ill

d e to form a casting, means for separating the 156 die sections to eject the casting, and means automatically actuated by the separation of the die sections for ejecting the surplus metal contained in the chamber after the casting has been formed from the chamber into the melting pot.

10. In a die-casting machine, the combination with a die member having an inlet opening and a melting pot of a pressure chamber mounted in casting relation with the die member, metal-conveying means connecting the chamber with the interior of the pot, pressure means secured to the die adapted to cause molten metal contained chamber, and spring-actuated means for automatically varying the size of the die inlet opening for preventing metal flowing into the die as the chamber becomes fil1ed..

12. In a die-casting machine, the combination with a melting pot and a pressure chamber adapted to receive molten metal from the pot, of a die member having an inlet opening in casting relation with said pressure chamber, pres.- sure means adapted to cause molten metal to flow from the pot into the pressure chamber under a lesser pressure for filling the chamber, and from the chamber into the die cavity under a greater pressure, and means for automatically varying the size of the die inlet opening for preventing the flow of metal into the die cavity during the filling of the chamber and permitting the flow of metal into the die cavity as the metal is forced from the chamber. 7

13. In a die-casting machine, the combination with a melting pot, of a pressurechamber adapt-' ed to receive molten metal from the melting pot,

and pressure-chamber for causing molten metal contained in the pot to flow into said chamber, means for ejecting the molten metal from the chamber into the die cavity, and spring-actuated means associated with said inlet opening for preventing molten metal being drawn into the die cavity by suction and adapted to permit the flow of the molten metal into the die cavity during the action of the. ejecting means.

14. In a die-casting machine, the combination with a die member and a pressure chamber mounted in casting relation with said die, of a plunger mounted for reciprocative movement in said chamber, means for reciprocating the plunger to eject the molten metal from the chamber .into the die to form a casting, said plunger having means adapted to engage the surplus metal remaining in the chamber after the casting has been formed to cause said surplus metal to move with the plunger to the initial position, an ejector plate mounted for reciprocative movement into the chamber for ejecting the surplus metal from said plunger, and means operated by a movable member of the die-casting machine for automatically actuating the ejector plate when the plunger is in the initial position for ejecting the surplus metal from said plunger.

15. In a die-casting machine, the combination with a sectional die member and a pressure chamber mounted in casting relation with said die, of a plunger mounted for reciprocative movement in said chamber, means for reciprocating the plunger to eject the molten metal from'the chamber into the die to form a .casting, said plunger having means adapted to engage the surplus metal remaining in the chamber after the casting has been formed to cause said metal to move with the plunger to the initial position, means for separating the die sections to eject a casting, an ejector plate mounted for reciprocative movement into the chamber, and means con- .necting the ejector plate with one of the die sections whereby said ejector plate will be actuated by said die sections during the said separating movement to eject the surplus metal from said plunger.

WILLIAM J. DURING. NATHAN LESTER.

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