US1627784A - Die-casting machine - Google Patents

Description

May 10, 1927.

1,627,784 May lof 1927 T. c. KoRsMo DIE CASTING MACHINE Filed June' 28, 1925 Y 4 Sheets-Sheet 2 /28 /3 y v M f'/.\ @9,1 i A@ f 5' ATTORNEYS May 10 1927. v 4 1,627,784

T. c. KoRsMo DIE CASTING MACHINE Filed June 28, 1926 4 Sheets-Sheet 5 L. ALV, BY ma A TT ORNE YS May 10 1927.

' T. C. KORSMO DIE CASTING MACHINE Filed June 28, 1926 4 Sheets-Sheet 4 INVENTOR I (E.

ATTORNEYS Y Patented May lO, 1927."

UNITED STATES PATENT OFFICE.

TORBJORN CONRAD KORSMO, OF MADISON, WISCONSIN, ASSIGNOR TO MADISON-KIP? CORPORATION, F MADISON, WISCONSIN, A CORPORATION OF WISCONSIN.

DIME-(menarel Macmms,

Application led .Tune 28, 1926. Serial'llo. 119,143.

This 'invention relates to die casting ma- 'chines and more especially to those in which the molten metal is injected into the die by air under pressure.

In prior art machines .the molten' metal 1s usually contained in a pressure chamber or goose neck to which air is admitted through a valve from a pressure line. The quantity of air admitted and the rate of admission are not subject to as close control as is desirable, and one of the prime objects of the present invention is to secure such control iu a simple and practical manner.

In a prior application, Serial No. 13,543, filed March 6, 1925, there is described and claimed a machine in which the air under pressure is furnished by a spring urged piston, which is set or stressed during the closing movement of the dies by the die actuating mechanism and released-after the dies are closed.

The more important features of novelty described herein are applicable to such a machine, but in order to develop additional features of novelty, the invention will be here described as embodied in a new type of machine, in which air from a pressure line is admitted and exhausted to move a piston or abutment, and this abutment by its movements displaces the air which acts directly on the molten metal.

Viewed from a somewhat different angle, the piston serves as a limiting partition., which controls the quantity of air admitted to act against the metal, and prevents cold air from the supply line from flowing into contact with the molten metal. By controlling the rate of movement of the piston, and by controling the air displacing action of the piston, it is possible so to determine the How of metal to the die as to secure the best eect, and consequently freedom from blow holes and like defects.

Certain features of novelty herein described niay also be used in those machines in which air from a supply line. acts di'- i'ectly on the molten metal, and no-necessary limitation to use with the particular machine herein described is implied as to such features.

The preferred embodiment of the inven-v tion is illustrated in the accompanying draw! 'ings` in which,

Figure l is a side eevation of the machine with the driving motor and controlling clutch mechanism broken away. The dies are shown closed and the piston has completed its working stroke.

Figure 2 is a plan view of the same. Figure 3 is an enlarged plan View' of the cylinder and piston mechanism with parts broken away to show the construction. 'llic piston is shown at the start of the working stroke.

' Figure 4 is a fragmentary View, part in elevation and part in vertical section, showing the inlet valve mechanism open (at the start of the pistons working stroke).

Figure`5 .is afragmentary view in section showing the exhaust valve mechanism closed (during the Working stroke) 'Figure 6 is a section 'on the line 6-6 of Fig.

Figure 7 is a view similar to Fig. 3, but showing the partsin the positions assumed whenthe dies are open but moving toward closed position.

Figure 8 is a View similar to Fig. 4 but showing the parts in the position of Fig. 7 IFigure 9 is a section on the line 9-9 of Figure 10 is a fragmentary vertical axial section showing the position of tlie parts when the dies are wide open. y

Figure 11 is an enlarged fragmentary section of the upper end of the goose neck and the bleed valve.

Figure 12 is an enlarged transverse section on the line 12-12 of Figure 10.

In order to disclose the invention fully it is necessary to describe it in combination with dies and die actuating mechanisms. Devices described and claimed in Patent N o. 1,590,246, dated June 29, 1926, and prior application Serial No. 86,285, filed Febru- I-ary 5, 1926, have been chosen for this purpose. Forthis reason such devices are not claimed herein.

In the use of the machine it is at times hand end in Fig. 1. Tn the machine as constructed they extend further and carry a motor and clutch supporting cradle. This, however, is not a part of the present invention and is omitted to simplify the drawing. In the complete machine, therefore, there are additional base members to carry the extending portions of the rods 16, and this extension is sufficient to permit the carriage to move to the right a distance approximately equal to the interval between the base members 15 shown in Fig. 1.

A housing 17 is provided with lugs 18 which embrace and are slidable upon the rods 16. Spaced from the housing 17 and also slidable on the rods 16, is a yoke 19 which carries a .so-called hot plate 20. The hot plate is a support on which the fixed die part 23 is removably mounted. The hot plate is connected with the housing'l by means of four guide bars 21, the guide bars serving as means to support and guide the movable die carrier 22, on which the movable die part 24 is removably mounted.

' Thus the yoke 19 and housing 17 are connected together by the bars 21 to form a carriage structure which is slidable bodily from its normal positionshown in Fig. 1 to the right, and the effect of such motion is to carry the hot plate 20, the die carrier 22, and the related actuating mechanism bodily to the right away from the melting pot, which will shortly be described.

The housing 17 encloses a worm wheel 25, which'is driven by a worm 26 also enclosed in the housing 17. The Worm is mounted on a shaft 27 and is driven by an electric motor through a clutch mechanism, both mounted to the right of the housing 17, and both omitted from the drawings, as already explained. l

The worm wheel is mounted on a shaft 28 which extends out of the housing 17 and carries at its opposite ends parallel cranks of equal radius; these cranks are indicated by the reference numeral 29, Iand each has a crank pin 30 and a cam 31, the cam being preferably formed integral with the crank. The identical connecting rods 32 are provided each with a longitudinal slot 33 in its swinging end, and this slot receives the corresponding crank pin 30. Adjacent the inner end of each slot 33 is a follower roller 34 which coacts with the periphery of the corresponding cam 31. The other end of each rod is connected by a wrist pin 35 with a corresponding block 36 which guides the wrist pin 31 in a right line passing through the axis of the shaft 28.

The cams 31 are identical and symmetrical with reference to lines radial with respect to the axis of the shaft 28. One portion of the periphery of each cam is arcuate and concentric with the crank pin 30. When this portion of the cam coacts with its follower reame@ roller 34 crank pin 30 is confined in the outer end of slot 33 and a simple crank and connecting rod drive exists between the shaft 28 and each block 36. The remaining portion of each cam 31 is so formed that, coacting With the follower roller 34, it moves the crank pin 30 in the slot 33 at such a rate as to neutralize the effect of the crank pms motion on the block 36. Consequently, while the cranks 29 swing with the rollers 34 in contact with the so called dwell portions7 of the cams, the blocks 36 stand at rest.

1t will'be observed also that the transition from the dwell portion of the cams to the arcuate portion is sudden and that therefore the blocks 36 are reciprocated simultaneously with approximately harmonic motion but come suddenly to rest in the inward motion, dwell, and then suddenly start to move outward. The blocks 36 are connected to actuate the movable die part and also certain other timed portions of the mechanism. This cam mechanism and the operation of the die part so that it has a sudden opening movement are claimed features in certain of the prior applications above identified.

The crank connecting rod and cam mechanisms are strict duplicates, as has been suggested, and operate strictly in phase with each other. Each of the blocks 36 is fixed on a corresponding rod 37 and adjustable thereon by means of clamping nuts 38. The rods are guided in bearings 39 mounted on the housing 17 and in bearings 40 mounted on the yoke 19. They project to the left beyond the bearings 40 in order to actuate related mechanism hereinafter described. They pass through guide bearings 41 on the die carrier 22 which they operate positively in an opening direction, and yieldingly in a closing direction. The positive opening eugagement is through a pair of nuts 42 which are threaded on the rods 37 and which are locked together in the manner of check nuts. One of these directly engages bearing 41. The yielding engagement is through springs 43 which are seated against a pair of check nuts 44 also threaded on the corresponding rods 37.

Mounted between the leftmost base members 15 is a furnace chamber indicated generally by the reference numeral 45 having heating means diagrammatically illustrated at 46. 'Any type of furnace and any type of heating means might be used.

Resting in the top of the furnace chamber 45 is a melting pot 47 which is bodily removable.

It will be observed that in the leftmost position of the yoke 19 and housing 17, the die parts 23 and 24 are above the right hand end of the melting pot 47 in position to be engagedV by the goose neck hereinafter described.

Beyond the furnace chamber 45 and lli lil

aligned with the base members 15 are two supports 48, each'of which'has at its upper end a lug 49, through which a corresponding hinge pin 5,0 is inserted.l Straddling the lug 49 of each base member 48 are pairs of lugs '51- on each sideof a base casting 52'. By

withdrawing either hinge pin 50 thebasic casting 52 may be swung around the remaining pin 50. The member 52 carries the cyllinder 53 and theeffect of such action is to sible, therefore, to adjust the cylinder in the.

direction of its axis, and this adjustment -is useful to'position the end of the gooseneck relatively to the die.

The goose neck .is shown at 60 and is pivoted at 61 to a bracket formed on the forward end of the cylinder. The end of the goose neck is vformed with a nozzle 62 which coacts with a recess in a shiftable'nozzle plate 63 pivoted at the lower side of the fixed die part 23. The nozzle plate 63 is formed with'a recess and a communicating through port, as is clearly shown in Figure' i' 10, and seatsagainst lthe lower face of the two die parts 23 and 24, after these are closed together, with the throughport in the nozzle plate 63 in Aregistry with the sprue hole in the die, and the 'nozzle 62 in the recess and in registry with the through port.

Consequently, the adjustment effected by the screw 59 is such as to establish the proper relation between the nozzle 62 of goose neck 60 and the recessvi'n the nozzle plate 63. p

The goose neck is actuated by a vertically movable cross head 64 with which it is releasably connected. This releasable connection consists of an upward extension 65 on the goose neck, which'has laterally extendj ing trunnions-66 (see Fig. 12). The cross head 64 is formed with a vertical slot 67 having lateral extensions 68 in which the trunnions 66 engage. Consequently, in the normal position of the parts the vertical motion of the cross head 64 is imparted directly to the goose neck 60. The cross head 64 is carried by the yoke 19 and when this is withdrawn to the right the cross head 64 'moves with itand automatically releases the goose neck 60.

The cross head 64'is guided on the back of the hot plate 20. On the face of this are two projecting lugs 69 which carry vertical bar guides 70. On the bar guides 70 are vertically slidable tubular members 7l which are ixed at their lower ends inthe cross head 64 and at their upper ends in a crossyoke 72. Thel tubular members are further guided by a-pair of apertured lugs 73 which are also carried by the hot plate 20. The yoke 72 is actuated throughv yielding yconnections at each side of the machine froina corresponding one of the rods 37. The rod 37 passes through an eye 74 on one arm 75 of a bell crank. Stop lugs 76 and 77 on the rod 37 engage the arm 75 and actuate thesame. Each arm is journaled at 78 on the yoke 19 and has rigidly connected therewith another arm 79 which'has a pin and slot connection 80, with the upright rods 8l. The rods 81 are slidable through lugs 82 ou the cross yoke 72, and yielding connections'1 between the rods 81 and the yokes 72 are afforded by the compression springs 83 and 84 mounted above and below the lugs 82 and adjustably stressed by the nuts 85 and 86.

The parts are so timed that the die part- 24 engages the die part 23 before the rod 37 reaches its leftward limit of motion and before the goose neck 60 has been raised to its upper limit of motion. The rods 37 then continue to move to the left, stressing the springs 43 and-increasing the closing pres- 9 sure. on the two die parts. This vcontinued motion causes the goose neck nozzle 62 to engage the plate 63 and force it against the lower face of the die parts 23 and 24, which are at this time in close contact with each other. This occurs before the rod 37 has completed its leftward motion, and the final portion ofthe motion is used to actuate the air mechanism which establishes pressure within the goose neck 60 and forces the molten metal from the goose neck into the die by way of the nozzle plate-63.

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The air so used is' displaced by a piston in the cylinder- 53 and this piston is actu'- ated by compressed air admitted behind it from a pressure line.

The mechanism now to be described involve-s the major portion of the present invention. The die actuating mechanism and the goose neck actuating mechanism, generally speaking, are ancillary features claimed elsewhere and are here described only in the interest of a full and adequate explanation of the invention.

The cylinder 53 contains a' piston 90 to which is fixed a piston rod 91.' The cylinder is closed at both ends by heads, and at the forward end has a port 93 which extends to a cup shaped recess 94 formed in a projecting nipple. With this coacts the convex nipple 95 having a registering port which communicates with the interior of the goose neck 60. The nipple 95 seals in the recess 94 when the goose neck is drawn up with its discharge nozzle 62 in engagement with the nozzle plate 63. When the piston 90 moves to the right it displaces airfrom the cylinder through the port 93 and into the goose neck 60.

The rod 91 extends through a stufiing box 96 and is connected toa crossyoke 97 by means of which the piston is retracted and also controlled in its movements. The yoke 97 is connectedby two rods- 98 with a yoke 99 having two guide bearings 100 which slide each on a corresponding one of the two rods 37 near the rear ends thereof. This yoke. 99 is provided ateach end with an extension 101, to each of which is bolted a corresponding piston rod' 102 of an oil retarding device. Each rod 102 is connected to a corresponding piston 103, and each such piston works in a corresponding cylinder 104 supported by a bracket 105 on the base member 52. The cylinders contain oil.

A by-pass pipe 106 connecting the opposite ends of the .cylinder 104 is controlled by a throttling valve 107. By adjusting the valves 107 it is possible to'determine the4 `rate of movement of the piston 90 to the right. Its motion to the left is mechanically effected and is relatively so slow that the oil checking devices are then without material effect.

Each of the bearing members 10() is formed with a vertical guideway in which is mounted a shouldered latch pin 108. When the rods 37 move to their extreme right hand positions, which they do after the piston 90 has been forced to the right hand limit ot its motion, the ends of the rods 37 over-l run the latch pins 108 and these pins drop and engage the ends of the rods, so that on the return -movement lof the rods 37 to the left vthey displace the piston 90 also lto the left. As stated, this motion takes place slowly` so that the oil checks have no appreciable effect.

As the piston reaches its letthand limit of motion. and before the goose. neck 60 has been fully raised, vthel latch Amembers 108 are raised so as to disconnect the yoke 99 from thev rods 37. This is effected by an inclined cam 109 formed on the end of a bar which is adjustably mounted at 110 in a bracket 111. This bracket 111 :is supported on the rear cylinder head and in turn supports the valve mechanism now to be descrlbed.

The function ot this valve mechanism is to admit air to the space to the left of the piston 90 to force this piston to the right, and thereafter to vent the space to atmosphere to permit the piston 90 to be returned without resistance to its initial position as just described. Briefly stated, the rods 37 at their limit of motion to the left, and consequently during the dwell period, close en exhaust port leading 'from a space to the left of thepiston 90 and open an admission port leading to such space from any suitable source of pressure fluid. In all other positions of the rods 37 the exhaustside of the machine which is nearer to the.

observer in Fig. 1. The inlet valve chest is shown at 112, and the air supply line at 113, see Figs. 3, 4 and 8. The space within the valve chest is divided into two parts by a valve seat 114 with -which coacts the poppet valve 115, which tends to seat under pressure entering through 'the pipe 113. To the stem. of the valve 115 is connected a rod 116 mounted in a guide 117` and on the rod 116 there is threaded at 118 an adjustable extension 119, with which the end of the rod 37 collides after the corresponding latch 108 is released.`

The motion of the rod 37 after this latch is released unseats the valve 115 and allows pressure fluid to enter by way of valve 115,

chamber 120, pipe 121, pipe 122, and port 123, to the space at the left end of cylinder 53. The threads 118 permit the extension 119 to be adjusted so as to time the inlet valve. The exhaust valve is essentially similar but reversed in arrangement. The exhaust valve chest isshown at 124 and the haust pipe leading to the atmosphere at Within the chest 124 is a seat 126 with which the exhaust valve 127 coacts. This valve is reversely seated with respect to the inlet valve, and its stem is connected to a sliding yoke 128 which is urged in a valve opening direction by two compression springs 129. The yoke 128 carries fixed to it a rod 130 which slides in a bearing 131, and which carries threaded to it at 132 an adjustable extension 133. The adjustment of this extension allows the closing of the exhaust valve to be timed, and the extension 133 is directly in the path of the end ot that rod 37 which is farthest from the observer in Fig. 1. The'inlet and exhaust Valves are timed so that the exhaust valve closes approximately at the time the inlet valve opens. The valve chest 124 is connected by a pipe 134 with the pipe 122 already described, and hence controls a pas- 'sage leading from the left end of the cylin der 53 to the atmosphere.

The mechanism so far described provides a complete operative structure which functions as follows: Assume that the melting pot is filled with metal, that the air supply pipe 113 is connected to a suitable source of air under pressure, and that the cranks 29 are horizontal and to the right. Under these conditions the air inlet valve is closed, the piston 90 is in its extreme right hand position, the dies are wide open, and the rods 37 are at the right hand limit of motion, i. e., far enough to engage behind the latches 108. The goose neck 60 is submerged in the molten metal and is filled therewith.

As the cranks 29 revolve the die carrier 22 moves to the. left and the goose neck starts to rise. The die part 24 engages the fixed die part 23 and shortly after this has occurred the goose neck 60 forces its nozzle 62 against the nozzle plate 63 and.V clamps the latteragainst the lower faces of the die. However, before this occurs the latches 108 will have been released by the cams 109, so that the piston 90 comes to rest before the l nipple 95 seals in the recess`94. This eliminates any possibility that the motion of the piston will drawn molten metal from the goose neck into the cylinder.

Shortly after the dies have closed and the piston 90 has cometo rest the nozzle 62 on the goose neck engages the nozzle plate 63, efecting a tight seal between the nozzle, the nozzle plate, and the bottom of the die. At the same time, the nipple 95 engages in a recess 94 and conditions are established for shooting the castin A slight further movement of the rods 3 closes the exhaust valve 127 and opens the inlet valve 115, whereupon air pressure is admitted from the line 113 to act against the rear of the piston 90 vand to force it to the right at whatever speed is permitted by the adjustment of the valves 107. The rods 37 remain at their left hand limit of motion for a considerable period, during the dwell caused by the cam 31 intended to allow the casting to freeze in the mold. vAt the end of this period the rods 37 again start to the right, closing the inlet valve and opening the exhaust valve,

so that the piston is once more free to be forced back to the left in the ensuing cycle of operations.

The machine just described is entirely operative, but a more refined operation can be secured by the addition of certain op-l tional details now to be described. The first of these is the throttling vent valve whose casing 140 is threaded into the goose neck 60, see Figs. 10 and 11. A needle valve 141 adjustable by a milled head 142 and threaded in the body 140, affords a minute adjustable ventport leading from the goose neck to the atmosphere.

In certain cases it has been found desirable to reduce the impact of the entering air upon the metal in the goose neck at the beginning of the piston movement, and thls throttling vent valve has been found highly effective in overcoming diiiiculties encountered. Its utility varies with the nature of the mold, and it need not always be used.

The second refinement is a valve mechanism which functions to release all pressure from the vgoose neck at any desired time in the cycle, and in any event before the goose neck starts to lower. A pi e 150 leads from the port 93 to a valve cham er 151, see Figs.

nection and controlling 3, 4 and 10. Within the chamber 151 is a poppetvalve 152 which is seated by pressure in the chamber 151 and also by a spring 153. The valve 152 controls the flow to a vent port 154. It is forced open at the proper tune by a thrust rod 155 which is urged to the right by a spring 156, and which is arranged to be forced back by one arm 157 of a bell crank pivoted at 158 on the housing 17. The other arm 159 of the bell crank carries a roller 160` which runs on a cam 161 adjustably mounted on the shaft 28. This cam is ordinarily arranged to open the valve 152 shortly after the piston 151 reaches the right hand limit of its motion, and maintain it open at least lon enoughto insure the complete venting o the pressure.

The use of the piston has a particular advantage, in that it permits very rigid control of the'rate of air admission to the goose neck, and in that the air injected to the goose neck is takendirectly from the space above the melting pot. Air taken from above the melting pot has a reduced oxidizing tendency, and moreover is heated.

Approximately equivalent results can, however, be secured by omitting the pist0n 90 and its connected parts, that is, generally speaking, the rod 91, the yoke 97, rods 98, and the yoke 99 with the connected latches and oil cylinder mechanism. In such casethe inlet and exhaust valves 115 and 127 handle the admission of air directly from the air line 113 to the goose neck. The use of the bleed valve shown in Fig. 1 and of the positive vent valve 152 is optional, but is Y here probably more desirable even than when the piston is used, because of the modifylncr characteristics which they possess.

-What is claimed is: 1. The combination with a die casting machine of the type in which the molten metal is forced into the die by gas under pressure enterin through a 'pressure connection, of a mova le abutment inter osed 1n said conow therethrough and means for regulating the movement of said abutment.

2. The combination with a diecastingtmachine of the type in which molten metal from a supply thereof is forced into the die' by gas under pressure entering through a pressure connection, of a movable abutment interposed in saidv connection and controlling :How therethrough; mechanical means for restoring said abutment to its initial position after movement by pressure; and means for causing said abutment to draw gases into said connection from adjacent the molten metal supply during such restoring movement.

3. The combination with a die casting machine of the type-in which molten metal from a. supply thereof is forced into the die by gas under pressure entering through a pressure connection; of a movable abutment interposed in said connection and controlling flow therethrough; means for regulating the movements of said abutment when shifted by such fluid under pressure; mechanical means for restoring said abutment to its initial position after movement by pressure; and means for causing said abutment to draw gases into said connection from adjacent the molten metal supply during such restoring movement.

4. The combination with a die casting machine of the type in which molten metal '1s displaced from a pressure chamber into a die by pneumatic pressure; of an abutment periodically movable to establish such pressure; and elastic fluid pressure motor means for so moving said abutment.

5. The combination with a die casting machine of the type in which molten metal is displaced from a pressure chamber into a die by pneumatic pressure; of a piston periodically movable to establish such pressure; elastic fluid pressure motor means for so moving said piston; and an adjustable retarding means operatively connected with said piston.

6. The combination with a die casting mal chine of the type in which molten metal is ldisplaced from a pressure chamber into a die by pneumatic pressure; of a piston periodically movable to establish such pressure; elastic fluid pressure motor means for so moving said piston; and a liquid displacing check device operatively connected to control the movements of said piston.

7 The combination with a die casting mav chine vof the type in which molten metal is displaced from a pressure chamber into a die by gas pressure; of a constantly open bleed port acting to vent gas from said pressure chamber.

8. The combination with a die casting machine of the type in which molten metal is displaced from a pressure chamber into a die by gas pressure; of a constantly open bleed port acting to Vent gas from said pressure chamber; and means for adjusting the effective area of said port.

9. In a die casting machine, the combination of a separable die; a pressure chamber movable into and 'out of connection with said die; an abutment movable to force air into said pressure chamber to expel metal therefrom into said die; means for operating said die, pressure chamber and abutment in timed relation; and means for venting said pressure chamber to atmosphere after said abutment has completed its Working stroke and While said pressure chamber is in connecting relation With said die.

10. In a die castin machine the combination of a die including separable parts; a

pressure connection which when inactive is open to atmosphere; a molten metal container; a pressure chamber movable 'between filling position beneath the molten metal, in which it is disconnected from the die and pressure connection, and an active position in Which it connects With the die and pressure connection simultaneously; a mechanism operable to establish pressure in said connection; a valve operable to exhaust pressure from said connection and chamber While connected with each other; and actuating means arranged to closelthe dies, move the pressure chamber-'to connected position, operate the pressure establishing mechanism,l operate the exhaust valve While the pressure chamber is in connecting position, and then shift thepressure chamber to filling position and open the die.

11. In a die casting machine, the combination of a molten metal container; a separable die; a pressure chamber adapted alternately to dip into said container and connect with the die; actuating means common to the die and pressure chamber for shifting them in timed relation, first closing the die and then connecting the pressure chamber therewith; a pressure connection leading to said pressure chamber; a movable abutment interposed in said connection; and means operable by said actuating means and controlling the admission of pressure fluid behind said abutment.

12. In a die casting machine, the combina` tion of a molten metal container; a separable die; a pressure chamber adapted alternately to dipinto said container and connect with the dle; actuating means common to the die and pressure chamber for shifting them in timed relation, first closing the die and then connecting the pressure chamber therewith; a pressure connection leading to said pressure chamber; a movable abutment interposed in said connection; means operable by said actuating means and controlling the admission of pressure fluid behind said abutment; and means for regulating`the movement of said abutment under pressure by said Huid. l

13. In a die casting machine, the combination of a molten metal container; a separable die; a pressure chamber adapted alternately to dip into said container and connect with the die; actuating means common to the die and pressure chamber for shifting them in timed relation, first closing the die and then connecting the pressure chamber therewith; a pressure connection leading to said pressure chamber; a movable abutment interposed insaid connection; means operable by said .actuating means and controlling the admission of pressure fluid behind said abutment; and means operable by said actuating means in its die closing movement serving to retract said abutment and then release the same.

14. In a die casting machine, the combination of a molten metal container; a separable die; a pressure chamber adapted alternately to dip into vsaid containerand connect with the die; actuating means common to the die and pressure chamber for shifting them in timed relation, first closing the die and then connecting the pressure chamber therewith;

a pressure connection leadin to said pressure chamber; a movable a utment interposed in said connection; means operable b said actuating means and controlling the at mission of pressure fluid behind said abutment; means for regulating the movement of said abutment under pressure by said fluid; and means operable by said actuating means in its die closing movement serving to retract said abutment and then release the same.

15. In a die casting machine, the combination of a molten metal container; a separable die; a pressure connection; a pressure chamber adapted alternately to dip into said container and to connect with said die and connection simultaneously; actuating means common to the die and pressure chamber for shifting them in timed relation, closing the die and connecting the pressure chamber; a movable abutment interposed in said pressure connection; and means operable in timed relation by said actuating means to admit pressure fluid behind said abutment and thereafter vent the pressure chamber, both while the latter is in connecting position.

16. In a die casting machine, the combination of a molten metal container; a separable die; a pressure connection, a pressure chamber adapted alternately to dip into said container and to connect with said die and connection simultaneously; actuating means common to the die and ressure chamber for shifting them in time relation, closing the die and connecting' the pressure chamber; a movable abutment interposed in said pressure connection; means for regulating the movement of said abutment; and means operable in timed relation by said actuating means to admit pressure fluid behind said abutment and thereafter vent the pressure chamber, both while the latter is in connecting position.

17. In a die casting machine, the com'- bination of-a molten metal container; a separable die; ay pressure connection, `a pressure chamber adapted alternately to dip into said container and-to connect with said die and connection simultaneously; actuating means common to the die and pressure chamber or shifting them in timed relation, closing the die and connecting the,pressure chamber; a movable abutment interposed. in said pressure connection; means operable in timed while the latter is in connecting position;

and means shiftable by the die actuating means as the dies close, serving to restore said abutment.

18. In a die casting machine, ,the combination of a molten metal container; a separable die; a pressure connection, a ,pressure chamber adapted alternately to dip into said container and to connect with said die and connection simultaneously; actuating means common to the die and pressure chamber for shifting them in timed relation, closing the die and connecting the pressure chamber; a movable abutment interposed in said pressure connection; means operable in timed relation by said actuating means to admit pressure fluid behind said abutment and thereafter vent the pressure chamber, both while the latter is in connecting position; and an adjustable valve controlling an independent vent from said ressure chamber.

19. In a die casting mac ine, the combination of a die having a movable part; apressure chamber movable into and out of connecting relation with said die; reci rocating actuating means having yielding riving connections with the movable die part and the pressure chamber; a piston' arranged to force air into said chamber; a pressure line; valve mechanism controllin the admission of Huid from said, pressure line a ainst said piston to move the same in air orcing direction; means whereby said actuating means operates said valve mechanism as the former reaches its limit of motion in die closing direction; a latch connection between said actuating means and piston when the latter moves in die closing direction for retracting the piston; and means forA releasing said latch connection before said valve mechanism is operated.

20. In a die casting machine, the combination of a die having a movable part;

a cylinder having a discharge port at its forward end; a pressure chamber movable into and out of simultaneous connection with said port and the die; reciprocating actuating means having yielding connections arranged irst to close the die and then kconnect the pressure chamber, and to operate reversely in the reverse order; a piston in said cylinder; a pressure line leading to the rear end of said cylinder; valve mechanism controlling the admission of pressure from said line to the rear end of said cylinder, said mechanism being operable by sald actuating means at the limit of its motion in die closing direction; a latch connection between said actuating means and piston arranged to move the latter rearwardly as the die is closed; and means for releasing said latch before the pressure lll chamber reaches connecting position and prior to the operation of said valve mechanism.

21. In a die casting machine, the combination of a die having a movable part; a cylinder having a discharge port at its forward end;` a pressure chamber movable into and out of simultaneous connection with said port and the die; reciprocating actuating .means having yielding connections arranged yfirst to close the die and then connect the pressure chamber, and to operate reversely in the reverse order; a piston in said cylinder; means for controlling the movements of said piston; a pressure line leading to thc rear end of said cylinder; valve mechanism controlling the admission of pressure from said line to the rear end of said cylinder', said mechanism. being operable by said actuating means at the limit of its motion in die closing direction; a latch connection be` tween said actuating means and piston arranged to move the latter rearwardly as the die is closed; and means for releasing said latch before the pressure chamber reaches connecting; position and prior to the operation of said valve mechanism.

In testimony whereof I have signed my name to this specification.

TORBJ ORN CONRAD KORSMO.

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