US1781168A - Die-casting machine - Google Patents

Description

Nov. 11, 1930. E DOLLIN ET AL DIE CASTING MACHINE 8 Sheets-She et 1 Filed Feb. 23, 1928.

TTOIRIVEY Nov. 11, 1930. E DOLUN ETAL 1,781,168

DIE CASTING MACHINE Filed Feb. 2:5, 192s a Sheets-Sheet 5 Ill/VENT R3 Nov. 11, 1930. E, N, DOLUN ET AL 1,781,168

DIE CASTING MACHINE Filed Feb. 25, 1928 8 Sheets-Sheet 4 B Z Z ATT RIVEY NOV. 11, 1930. DOLLIN ET AL 1,781,168

DIE CASTING MACHINE Filed Feb. 23, 1928 8 Sheets-Sheet 5 m BY 19% .www

ATTO IVEY E. N. DQLLIN ET AL 1,781,168

DIE CASTING MACHINE I Fil ed Feb. 23, 1928 a Sheets-Sheet. 6

Nov. 11, 1930.

.8 i r i P DIE CASTING MACHINE Filed Feb. 23, 1928 8 Sheets-Sheet 7 A T (IR/VEY NOV. 11, 1930. N, DOLLINETAL 1,781,168

' DI P CASTING MACHINE Fil ed Feb. 25, 1928 s Sheets-Sheet 8 Fatented Nov. 11, 1930 PATENT OFFICE EDGAR N. DOLLIN, OF MALBA, NEW YORK, AND CONRAD C. JACOBSON, OF GLEN RIDGE,

NEW JERSEY; SAID JACOBSON ASSIGNOR TO JOHN ROBERTSON CO., INC., OF BROOK- LYN, NEW YORK, A CORPORATION OF NEW YORK, AND SAID DOLLIN ASSIGNOR TO ALLIED DIE-CASTING CORPORATION, OF LONG ISLAND CITY, NEW YORK, A COR- PORATION Application filed February 23, 1928. Serial No. 256,302.

This invention has reference to die casting machines and particularly relates to that type of machine in which the metal is forced into the die by a charge of fluid under high compression. In using machines of this character, the different operations employed, for the complete production of the casting, are performed by hand; but, due to the fact that compressed air is utilized to force themetal into the die, great care must beexercised to properly position and control the parts or serious accident will result.

Among the objects of our invention may be noted the following: To provide a machine which is largely automatic in its operation, and one in which a maximum of safety and accuracy are provided; to provide a'machine wherein the executive or functional parts of the machine are actuated by fluid means; to provide means such that the parts must be in their proper position before themetal is forced into the die; to provide automatic means by which the interacting mechanisms and their component parts are activated under perfect control to bring about accuracy of operation, eliminate the element of accident to operatives, and insure the production of perfect castings.

With the foregoing objects in view and others which will be set forth in detail during the course of this description, our invention consists in the parts, features, elements and combinations thereof hereinafter described and claimed.

In order that our invention may be clearly understood, we have provided drawings wherein:

Figure 1 is a view in side elevation of a machine, with parts broken away for clearness of illustration and parts in section, embodying our invention;

Figure 2 is a top plan view, the shaft carrying the handle for the control member being broken away and the handle being in section;

Figure 3 is a transverse sectional view on a larger scale, taken on line 3-3 of Figure Figure 4 is a longitudinal sectional view, on a large scale, through the charging end of the machine, the view being taken on the line of Figure 2; v

Figure 5 is a central, longitudinal sectional view through that part of the machinery housing supporting the fluid actuating means for advancing and retracting the sliding die-plate and the intensifying means, the section being taken on line 55 of Figure 2;

Figure 6 is a detail sectional view, on a largescale, of the control means, the section being taken on line 6-6 of Figure 8;

Figure 7 is a detail sectional view taken on line 77 of Figure 6; and

Figure 8 is a detail sectional lan View of the parts ShOWD lIl Figures 6 an 7, the view being taken on line 8-8 of Figure 6.

Referring to the drawings, the numerals 1O and 11 designate the frame parts of the machine, connected together by members 12.

The frame part or support carries the metal pot 13, and any suitable gas or electric heating means, not shown, occupies the space 14 under said pot. A metal charging trap or goose-neck 15 is adapted to be raised and lowered into said pot to be charged with molten metal. Fluid actuated means are provided for raising and lowering the gooseneck, as follows: W

A. hook portion 16 of the gooseneck is su ported on a yoke 17, the two legs of the yo e bein pivoted in bearing 18 at opposite sides of t e frame 10. The opposite end of'the gooseneck has a slotted arm 19, the slot or bifurcation receiving a pin 20 carried by arms 21, which are secured to'a shaft 22. The shaft 22 is mounted in bearing 23 on a plate 24,.slotted at 26, through which bolts 25 pass, said bolts being screwed into the top of the support 10. Set screws 27 in a flange 28, on the frame 10, bear against the plate 24 for adjustment of the latter. The shaft22 has secured to its outer end a pinion 29, Figure 4, which engages a rack 30 on a.

vertical shaft 31. A clutch 32 (Figure 2) may be interposed in the shaft 22 so as to allow for slight inaccuracies in lining up or for wearing of parts. The vertical shaft 31 is supported, for up and down movement, in a bearing 33, which may be integral with or supported by the plate 24' The upper and lower ends of the vertical shaft 31 are reduced of fluid pressure.

in diameter and act as rams and are engaged by the fluid actuating means. Housings or chambers 34 and 35 are provided for the rams ing on the ram 37, for lowering the goose-- neck is admitted through pipe 42, Which runs directly to the accumulator or source rected to the fact that the ram 37 is of considerably less cross-sectional area than the ram 36. The reason for this is that less pressure is required to depress the gooseneck and fluid pressure is always present in chamber 35. When it is desired to raise the gooseneck, an equivalent amount of. fluid pressure is admitted to the chamber 34 and, due to the greater crossesectional area of ram 36, a greater effective area is operated on by the fluid pressure enabling the heavier work of forcing the ram 36 downwardly to be performed to raise the gooseneck. When it is desired to lower the gooseneck, the control mechanism 41 operates to allow the pressure in chamber 34 to go to a waste line and the ram 37 to be raised, thus lowering the gooseneck. This arrangement makes for great simplicity of operation and does away with all valves and controls on the pressure line 42. Stops in the form of nuts 43 and 44,

on shaft 31, are provided for limiting the up and down movements of the rams 36 and 37. These stops cooperate with the ends of the bearing 33.-

The gooseneck, as particularly illustrated in Figure 4, is a casting of substantial weight and has a U-shaped chamber 45. One end of the gooseneck has a nozzle 46, and the top has connection with a compressed air supply pipe 47. When the gooseneck is lowered into the pot 13, as indicated in broken lines in Figure 4, the molten metal flows through the nozzle 46 into the chamber 45. When the gooseneck is raised, as shown in full lines, it is positioned with its nozzle 46 in communication with a flared passage 48 of a nipple or fitting suitably'held in a stationary die-holder 49. The charge of compressed air is then admitted through pipe 47, and the metal in chamber is forced through nozzle 46, passage 48, and into the dies. It isimportant that the gooseneck be properly positioned before the compressed air is admitted. If the nozzle 46 is not accurately positioned in relation to the passage 48, when the air is admitted, a serious acci- Special attentionis dident would result because the molten metal, instead of being forced into the dies, would be sprayed all around. Means are provided, so that the compressed air valve cannot be opened until the gooseneck is properly positioned, as follows:

Attached to shaft 22 is a crank 50 connected by link 51 to pitman 52 pivoted at 53 to a valve casing 54. The valve casing 54 houses two valves 55 and 56. Compressed air is supplied to the casing froma pipe 57 which leads to a compressor or other air supply. Valve 55 has a spring-pressed valve stem 58 projecting outside the casing and adapted to cooperate with an adjustable stop 59 on an operating lever 60, which is pivoted at- 61 to the valve casing. Valve 56 also has a spring-pressed valve stem 62' projecting out of the casing and adapted to cooperate with an adjustable stop 63 carried by the lever 60. Valve 55 admits the compressed air from line 57 to the casing, and valve 56 opens to atmosphere. Pivotally connected to the valve casing 54 and to pipe 47 is pipe 64. Thus, when the operating lever is. depressed or pulled down, the stem 58 is lifted and air valve 55 is opened and the stem 62 is depressed and valve56 is closed, thereby connecting the interior of the gooseneck with the source of compressed air. After the metal has been forced into the dies, the spring 65 raises lever 60 and valve 56 is opened while valve 55 is allowed to -close, valve 56 acting as a relief valve for pressure in the line 47 64 and interior of the gooseneck, and also acting as a vent to allow the air to escape from the gooseneck when it is again being charged with metal from the pot 13. Pitman 52 carries a stop 66 which engages the end 67 of operating lever 60, when the gooseneck is lowered. This of lever 60 until the gooseneck is properly positioned. Thus, the lever 60 cannot be depressed or pulled down to admit the compressed air until the gooseneck is in its proper position with nozzle 46 in alignment with passage 48 in the nipple.

The stationary die-holder 49, as shown in Figures 1 and 2, carries the stationary die 68, and the sliding die-holder 69 carries the movable die 70 and ejector box 71. The stationary die-holder is secured by bolts 72 to the frame 10, but may be shifted transversely so as to accurately position it in relation to the gooseneck nozzle and the character of dies that are being used. The frame-connect ing members 12, as shown in Figures 1 and 4, carry tongue and groove connections 73 for this purpose. Fluid actuated means are provided for advancing the sliding die-holder 69 so as to close dies 68 and 70, and said means will now be described.

Mounted on the frame or support 11 is a member 74, between which and the stationary die-plate 49 are four guide-bolts 75, upon which the sliding die-holder 69 may move back and forth. The bolts are threaded at 76 so that, when the nuts 77 are loosened, the member 74 may be adjusted so as to allow for more or less movement of the sliding die-plate, depending upon the thickness of the die. The means for positioning the member 74 will be described later. The member 74 has a large central bore 78 to accommodate the ram 79 for advancing the sliding dieplate. The ram 79 might be integral with the sliding die-holder, as illustrated in Figure 5, or it might be a'separate member. A

suitable stuffing box and packing 80 are provided at the point where the ram enters the bore 78. The fluid operating means is admitted to the bore 78 through pipe 81 which leads to the control means 41. Thus when the fluid enters the bore 7 8, it is obvious the sliding die-plate will be advanced to close the dies. It is very important that the dies be properly closed and held tightly closed for the same reasons as previously explained regarding the gooseneck being properly positioned. One of the most important features of our invention is the means for positively holding the dies in their closed position. What is termed an intensifying means are utilized for the purpose and said means will now .be described.

Positioned in back of the bore 78 is a plunger or intensifier 82. After the fluid actuated means has moved the ram 79 to position to close the dies, as shown in Figure 1, the control means 41 acts to admit fluid pressure into the chamber 83, through the pipe,

84. This fluid pressure is admitted back of the plunger-head 85, and causes the plunger or intensifier to enter the bore 78, as shown by dotted lines in Figure 1. This tends *to displace a certain amount of fluid in the bore 78; but, due to the fact that the fluid is positively held in the bore 78 by suitable valves, it is further com greatly increase thus powerfully holding the dies together so that it is impossible for the metal to escape when the compressed air forces the same from the gooseneck into the dies. Suitable ackino' 86, about the plunger and other pac ing 87, about the plungerhead, prevent the escape of fluid when the in tensifier is being operated. Fluid actuated means are provided to retract or pull back the sliding die-holder after the casting has been made or shot, the same including two bores 88, in the member 74, one above and the other below the bore 78 and both of smaller diameter than the bore 78. A pair of'cylinders 89' are accommodated in the bores 88 and rods 90 passing through stufling-boxes 91 are connected at 92 with the sliding die-holder 69. The fluid actuating medium is admitted to the bores 88 through pipes 93, which are connecteddirect- 1y to the accumulator or source of fluid supressed and the pressure is ply. The cross-sectional area of the ram the cross-sectional area of the rods 90, thus giving a greater efiective area for the fluid pressure means to operate on in the bore 78, and allowing the ram 79 to be advanced while the pressure is held in the bores 88. When the bore 78 is opened to the waste line by the control means 41, the cylinders 89 will operate to retract the sliding die-plate. Thus, there is no necessity for any valves or operating connections for the retraction of the sliding die-plate. v

The control mechanism 41 will now be described. The object of this control mechanism is to provide a simple means, whereby the operator, by moving a handle, applies first the fluid actuated means to close the dies,

and then applies the intensifier and raises by the pressure in the main cylinder, forcing it out of said cylinder, the gooseneck will be lowered, and the sliding die-holder retracted. The bore 78 is here referred'to as the main cylinder. mentioned are provided to cooperate with the control means, so that the intensifier can- Means as previously not be applied or the gooseneck raised until the dies have been closed; and means already described are provided so that the air cannot be admitted to the gooseneck until it is properly positioned. In this way a machine exceedingly simple and safe to operate is provided. The control means 41 is mounted on the member 74 and is particularly shown in Figures 6, 7 and 8. It comprises a base 94 which carries a block 95, having a series of passages and valves. The fluid from the accumulator, or source of fluid supply, is admitted to the member 95 through pipe 96.

It passes through passage 97, Figure 6, and

thence through vertical passage 98 and short passage 99 to vertical passage 100. In passage 100 is located a check-valve 101, Figure 7, which the fluid passes and enters chamber 102. It passes from chamber 102 through passage 103 to valve chamber 104, which houses valve 105. When valve 105 is opened, the fluid passes down and through short passage 106 to pipe 81, which goes to the main cylinder. This valve 105 is the first to be operated and by opening the same the fluid pressure is supplied to move the slidingdieholder in position to close the dies. Passage 97,'Figure 8, communicates by means of short passage 107 with valve chamber 108,

After valve 109 has been opened and the gooseneck raised and intensifier applied, the parts are in proper position to open the compressed air valve and force the metal from the gooseneck into the dies. Figures 6, 7 and 8 'show the parts in this position, and they are held there while the casting is being made. After the casting has been made, the parts may then be returned to their normal position. The valve 109 is closed and valve 112 is opened. Passage 113 leads from chamber to chamber 114 in which valve 112 is located. The fluid then passes into passage 115 and thence to waste line 116. The valve 112 allows the pressure to be relieved, and the gooseneck lowered and intensifier withdrawn. After the three valves have been opened and closed, the last valve 117 is opened. The valve chamberin which valve 117 is located is connectedby passage 118, Figure 8, to the main cylinder feed line, and valve 117 opens into passage 115, Figure 6, which leads to waste line 116, Figure 7.

Suitable means are provided to open andclose the valves in their proper sequence. Shafts 119 and 120 are mounted in brackets 121 and 122 secured to member 95. The shaft 119 carries cams 123 and 124, and shaft 120 carries cams 125 and 126. Rollers 127 mounted on bell-crank levers 128 are held in contact with cams 123, 124, 125 and 126 by virtue of springs 129 mounted on-studs 130, secured in brackets 131, in which the arms 128 are pivoted at 132. The short arms of the bell-crank levers '128 carry adjustable set screws 133, which have sockets 134 in their ends for cooperating with valve-stems 135 on the valves 105, 109, 112 and 117. All the valves, except the check-valve 101, are provided with screw-plugs 136, between which, plugs and valve members, are confined springs 137 for normally holding the valves in their closed osition. Suitable packing 138 is also provi ed for the valve-stems 135.

A large gear 139, Figure 8, secured on a shaft 140 having suitable bearings on the member 95, engages pinions 141 and 142 on the shafts 119 and 120, respectively. On the outer end of shaft 140 is a crank-arm 143, havin a-handle 144. When crank 143 is turned in a clockwise direction, it. rotates pinions 141 and 142.- Referring to Figure 2, when the arm 143 .is in the right-hand position or sition .A, an ofthe valves are closed. Vhen the arm is moved to the central position, or position B, pinion 141-is rotated by gear 140 and cam 123 engages one of the rollers 127 and opens valve 105. This allows the fluid actuating medium to enter- ..the main cylinder and move the sliding dieholder to close the dies. When the movement of the lever 143 is continued to its maximum" left-hand position, or the position shown in full lines in Figures 1 and 2, cam 124 operates to open valve 109, and valve 105 is closed. Valve 109 allows the fluid operating medium to raise the gooseneck and apply theintensifier. On the return of the lever toits normal position, the cams 125 and 126 open the valves 112, 117, respectively and the parts resume their normal position as previously described.

As previously stated, means are provided so that the gooseneck cannot be raised or the intensifier applied until the dies areclosed, and the means will now be described. Referring particularly to Figures 1, 2 and 3, an extension 145 from the member 74 has pivoted thereon a lever 146. The end 'of this lever is so positioned that itwill normallyprevent movement of the crank 143. This lever 146 must be removed from the path of the crank 143 before said crank 143 can be moved. Suitable means may be provided adjacent the control means for changing the position of lever 146, or, if the machine is being operated by two men, the helper may shift lever 146 from the other side of the machine. This will insure that neither the operator nor his helper will be in danger of having some part of their person near the moving parts of the machine. The handle 147 on the opposite side of the machine has rod 148, which is pivoted at 149 to lever 146. Spring 150 keeps lever 146 in a position to interfere with movement of crank 143, except at such times as handle 147 is pulled. A bell-crank lever 151 ispivoted on the extension 145. One arm of this bell-crank lever interferes with the movement of crank 143 when in its intermediate position or position B, and crank 143 cannot be moved from position B unt il the arm of the bellcrank lever interfering therewith has* been removed. This arm will not beremoved until the sliding die-holder has moved over and a closed the dies.

thus allowing the latter to be moved to the position for raising the gooseneck and applying the intensifier. A. spring 156, Figure 2, normally holds the bell-crank lever in position to interfere with the movement of crank 143. When crank 143 is being returned to its 1 initial position for starting another cycle of movements, it latches past bell-crank lever 151 and lever 146.

As previously mentioned, means are provided for adjusting the position of member 74, to compensate for inaccuracies and to take care of different conditions under which the machine must work, including the frame or support 11 having slidingly mounted in it, at 157, a plate 158 which has a rack 159 secured to its bottom central part. This rack 159 is engaged by a pinion 160 mounted on shaft 161 supported in the frame 11. Shaft 161 has an outer squared end 162 which may be engaged by a wrench'or handle to rotate pinion 160, and thus provide for a longitudinal adjustment or movement of member 74. After being properly set or adjusted, the member 74 is locked in position by bolts 163, Figure 1. Plate 158 carries strips 164 which engage grooves in member 74. A threaded bolt 165, having a squared end 166 and lock nut 167-is utilized to move member 74 transversely and lock it in its proper position. A hydraulic sliprjoint connection 168, Figures 1 and 2,

may be provided in fluid line 40, so that said pipe 40 maybe readily lengthened or shortened when the machine is being adjusted.

A brief rsum of the operation of the machine will now be given: Most of the views show the machine in position with the dies together, the gooseneck raised, and the intensifier applied. The crank 143, in its normal or control, position, would be to the right in Figure 1. By moving it to its control position, the fluid actuated means has advanced the sliding die-holder 69 and closed the dies. Moving the crank 143 clockwise from its control position to the position shown in Figure 1, raises the gooseneck and applies the intensifier. The lever 60 is then pulled down, the valve 55 is opened, and the compressed air enters the gooseneck and forces the metal into the dies. The crank 143 is then turned in an anti-clockwise direction and the fluid, operating upon the mechanism for holding up the gooseneck and applying theintensifier, is diverted to the waste line and the gooseneck is lowered and the intensifier withdrawn while said crank is being moved back to its control position.

Completing the movement of crank 143 to theleft, diverts the'fluid from the main cylinder bore and allows the dies to be separated and the sliding die-plate returned to its initial position. Ejector means, for ejecting the finished casting are common and not thought necessary to show, although such means are a part of our machine ,as constructed. The

parts have been omitted from the drawings to avoid confusion. The machine is now ready for another cycle of operations.

Numerous changes in details of construction and arrangements of parts, may readily be made by one skilled in the art, without departing from the spirit of the invention, as set forth in the ap ended claims.

Having thus descri ed our invention, what we claim and desire to secure by Letters Patent is: p

1. A die-casting machine having, in combination, a stationary die and a shiftable die, a ram for actuating the shiftable die,,fluid actuated means operating upon said ram tocause the same toposition the shiftable die accurately relatively to the stationary die, additional means acting directly upon the ram to lock the shiftable die when positioned, and a single means for controlling the action of both of the ram operating means.

2. A die-casting machine having, in combination, a stationary die' and a shiftable die, a ram for actuating the shiftable die, fluid actuated means operating. upon said ram to cause the same to position the shiftable die accurately relatively to the stationi ary die, a metal carrier for supplying molten metal to the dies, fluid actuated means for shifting the carrier to obtain and deliver the metal to the dies, additionalfluid means for locking the shiftable die at the critical .a ram for actuating the shiftable die, fluid actuated" means operating upon said ram to cause the same to position the shiftable die accurately relatively to the stationary die, auxiliary fluid actuated means operating directly upon said ram to hold the dies together, and a single means for controlling t e action of both of the ram operating means.

' 4. A die-casting machine having, in combination, a stationary die and a shiftable die, a ram for actuating the shiftable die, fluid actuated means operating upon said ram to cause the same to position the shiftable die accurately relatively to the stationary die, fluid actuated means operating parallel with the positioning means for retracting the shiftable die, and a single means for controlling the action of both of the ram operating means. y a

5. A die-casting machine having, in combination, a stationary die and a shiftable die, .a ram for actuating the shiftable die, fluid actuated means operating upon said ram to cause the same to position the shiftable die accurately relatively to the stationary die, a carrier for supplymg molten metal to the dies, fluid means for forcing the metal from the carrier into the dies, means for locking the shiftable die at the critical period, and

a single means for controlling the action of.

both of the ram operating means.

6. A die-casting machine having, in combination, a stationary die and a shiftable die, a ram for actuating the shiftable die, fluid actuated means operating upon said ram to cause the same to position the shiftable die accurately relatively to the stationary die, a carrier for supplying molten metal to the dies, fluid means for forcing the metal from the carrier into the dies, and a single controlling means for the ram operating means and to control the time of action of the metal-forcing means, whereby the dies may be first accurately registered.

7. A die-casting machine having, in combination, a stationary die and -'a shiftable die, a ram for actuating the shiftable die, fluidactuated means operating upon said .ram to cause the same to position the shiftable die accurately relatively to the stationary die, a carrier for supplying molten metal to theldies, fluid means for raising and lowering the carrier, fluid means for forcing the metal from the carrier into the dies, and a single means for controlling the action of the ram and the metal forcing means so as to prevent the metal being forced into the dies until the latter are in register.

8. A die-casting machine having, in com-- bination, a stationary die-holder, a sliding die-holder having a ram aflixetl thereto, cooperating dies carried by said holders, fluid means for actuating said ram to properly position said dies in relation toeach other, means for locking the ram at the critical period and. a single means forcontrolling the action of both of the ram operating means.

9. A die-casting machine having, in combination, a stationary die-holder, a sliding die-holder, cooperating dies carried by said holders, a ram to move said sliding dieholder toward said stationary holder, fluid actuated means to move said ram, additional fluid actuated means acting directly upon the ram for causing said sliding die-holder to retain its proper position, and fluid actuated means for controlling all the operations of said sliding die-holder.

10. A die-casting machine having, in combination, a stationary die, a cooperative sliding die, a ram to move said sliding die toward said stationary die, fluid means to move said ram, a chamber in which said ram' is housed and said fluid operates, and a plunger which is forced into said chamber after said ram has moved said slidin die.

11. In a die-casting machine, a 'pa1r of dies, a fluid actuated ram for forcing the dies together, an intensifying member in alignment with tional pressure for holding said dies together, and a single means for controlling .Said ram for applying addi the action of both of the ram operating fluid actuated controlling means forboth said ram and intensifying member.

13. In a die-casting machine, a pair of dies, a fluid actuated ram for forcing the dies together, an intensifying member in alignment with said ram for applying additional pressure for holding said dies together, fluid actuated controlling means for both said ram and intensifier, a metal charging trap for supplying metal to said dies, and fluid actuated means for raising and lowering said metal charging trap relatively to said dies.

14. In a die-casting machine, fluid actuated means for forcing the dies together, an intensifying member for applying additional pressure for holding said dies together, fluid actuated means for operating said intensifier, a metal charging trap for supplying metal to said dies, fluid actuated means for raising and lowering said metal charging trap relatively to said dies, and means for supplying compressed air to said metal charging trap to force the metal into said dies.

.15. In a die-casting machine, fluid actuated means for forcing the dies together, an intensifying member for applying additional pressure for holding said dies together, fluid actuated means for operating said intensifier,

a metal charging trap for supplying metal to -means for forcing the dies together, an intensifying member for applying additional pressure for holding said dies together, fluid actuated means for operating said intensifier,

a metal charging trap for supplying metal to said dies, fluid actuated means for raising and lowering said metal charging trap relatively to said dies, a valved control member for operating in sequence said fluid actuated means for forcing the dies together, and said fluid actuating means for operating the in tensifier, and raising and lowering said metal charging trap, and means cooperating with said valved control member so that said fluid actuated means for raising said metal char ing trap cannot operate until said dies are,

closed.

17. In a die-castingmachine, fluid actuated means for forcing t e dies together, an intensifying member for applying additional pressure for holding said dies together, fluid actuated means for operating said intensifier, a metal charging trap for supplying metal to said dies, fluid actuated means for raising and lowering said metalchargingtrap relatively to said dies, means for supplying compressed I air tosaid metal charging trap to force the metzl into said dies, and means for preventing said compressed air from being supplied 10 until said metal charging trap is properly positioned in relation to said dies.

18. A die-casting machine having, in combination, a metal carrier, a pair of dies one of which is movable relatively to the other,

means for shifting the movable die relatively to its mate to close the same to receive the metal from the carrier, means for driving the metal from the carrier into the dies, means for locking the movable die to prevent the latter means displacing it and means for controlling the driving means to prevent the metal from being forced from the carrier until the latter is in proper position relatively to the dies.

19. A die-casting machine having, in combination, a metal carrier, a pair 0 dies one of which is movable relatively to the other, means for shifting the movable die relatively to its mate to close the same to receive the metal from the carrier, means. for driving the metal from the carrier into the dies, means for locking the movable die to revent the latter means displacing it and uid means for controlling the action of the driving means 5 until the carrier is in proper position and the die-closing means has performed its functions. EDGAR N. DOLLIN- CONRAD C. JACOBSON.

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