US1478117A - Die-casting machine - Google Patents

Description

Dec. 18, 1923. 11,478,111?

' w. A. HEINZE DIE CASTING MACHINE Filed Dec. 12 1921 8 Sheets-Sheet 1 INVENT R'.

Wwdrflf w BY Q 2 m 4 TTORNEY.

Dec 18, 1923.

w. A. HEINZE DIE CASTING MACHINE Filed Dec. 12. 1921 8 Sheets-Shet 2 Dec, 18,1923. 11,478,117

W. A. HEINZE DIE CASTING MACHINE A TTORNE Y.

Dec. 18, 1923.

W. A. HEINZE DIE CASTING MACHINE Filed Dec. 12 1921 8 SheetSheec 4 Nbx l l I I 1 \l INVEN TOR.

ATTORNEY.

10. 18,1923. mwm

W. A. HEINZE DIE CASTING MACHINE Filed Dec. 12. 1921 8 Sheets-Sheet 5 Dec. 18,1923. 4 1,47%,1137

W. A. HEINZE DIE CASTING MACHINE Filed Dec. 12 1921 8 Sheets-Sheet 6 m G 1 Nl EX TOR.

ATTORNEY.

11 47831117 w. A. HEINZE DIE CASTING MACHINE Filed Dec. 12 1921 8 Sheets-Sheet 8 ATTORNEY.

Patented Dec. I8, I923, v

s eaten-r creme WILLIAM A HEINZE, OF CHICAGO, ILLINOIS, ASSIGNOR'TO CRANE COMPANY. OF

' CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS. I

DIE-CASTING: MACHINE.

Application filed December 12, 1921. Serial No. 521,608.

To all whom it may concern: apparatus of novel construction adapted to to Be it known that I, WILLIAM A. HEINZE, be quickly and easily put into and out of opa citizen of the United States, residing at oration and to be adjusted so that the cores Chicago, in the county of Cook and State of may be pulled either independently or in 5 Illinois, have invented certain new and useunison and either before or during separaful Improvements in Die-Casting Machines, tion of the dies. as

of which the following is a; specification. My invention also contemplates novel This invention relates to die-casting mameans for effecting quick injection of the chines, and has more particular reference to molten metal into the mold; also the provilo a vertical machine, so called by reasonof its sion of an improved clamping and locking general design characterized by vertically device for the charging door of the meltco separable die'members. ing pot.

One of the primary objects is to provide I have further aimed to provide a. practia generally im roved die-castin machine by cal and effective means for controlling the means of whic a superior gra e of castings various operations and to this end I prefer may be economically and efliciently proto employ a fluid-pressure operated mechaca duced. nism including a fluid pressure clutch and In furtherance of this'general object, my fluid pressure valve mechanism. The valve invention contemplates mounting the die mechanism is controlled in part by manual members in novel relation to the melting pot, operation and in part by cams. The opwhereby neither said die members nor the erator starts the machine by means of the die-supporting frame is subjected to heat manual control, and the several operations from the melting pot. In this regard, prior will 'b automatically performed in the machines are objectionable in that one or proper sequence under control of the cammore die members are located either above or operated valve mechanism, and the machine in contiguous relation to the melting pot and will be automatically stopped at the end of 7c become heated thereby. This heating of the "a cycle. In this connection, I have aimed to die members is inimical to efficient producprovide an improved fluid-pressure clutch. tion of castings. The present invention, Other objects and attendant advantages so therefore, insures the most desirable tem will be appreciated by tho-se'skilled in this pcrature for economica production of high art as the invention becomes better underno grade castings. V stood by reference to the following descrip- More particularly, my invention provides tion when considered in connection with the a die-casting machine characterized by a staaccompanying drawings, in which to tionary melting pot and accessories, and a Figure 1 is a side elevation of the control horizontally movable carriage equipped with side of a die-casting machine embodying my separable die members adapted to be closed invention showing the parts in the idle posiand opened and to be moved into and outof tion and the melting pot in section; nozzle tension position by suitable mecha- Fig. 2 is a similar side elevation, but showon nism. Inasmuch as the dies and carriage are ing the die carriage moved forwardly to the remote from the melting pot the most desirnozzle t nsion position; so able die temperature is insured. Fig. 3 is across sectional view through Other objects reside in the provision of the melting pot taken on the line 3-3 of novel mechanism for opening and closing Fig. 2; 45 the die members and for feeding the die car- Fig. 4 is a plan view of the machine as riage to and from the nozzle tension posishown in Fig. 2, omitting the core-pulling tion in which a-charge of molten metal is mechanism; injected into the mold formed by the dies, Fig. 5 is an elevation of the side of the Another object is to provide a core-pulling machine opposite from that shown in Fig. 2;

Figs. 6 and 7 are developments of the die closing and opening cam and of the die carriage cam, respectively;

Fig. 8 is an end elevation looking at the melting pot end of the machine;

Fig. 9 is a horizontal sectional view taken substantially on the line 9-9 of Fig. 2;

Fig. 10 is a detail view of the core-pulling cam shown in Fig. 9;

Fig. 11 is a detail section of the metal feed cam taken on the line 11-11 of Fig. 5;

Fig. 12 is a fragmentary end view as taken on the line 12-12 of Fig. 9;

Fig. 13 is a fragmentary sectional view taken substantially on the line 13-13 of Fig. 9;

Figs. 14, 15 and 16 are diagrammatic views showing different positions of the clutch shifting valves, the section through the four-way valve being taken on the line 14-14. of Fig. 2;

Fig. 17 is an enlarged sectional view taken on the line 17-17 of Fig. 9;

Fig. 18 is an enlarged section through the air injector valve taken substantially on the line 18-18 of Fig. 4;

Fig. 19 is an enlarged sectional view through the automatically operated clutchcontrol valve taken substantia'ly on the lines 19-19 of Figs. 4 and 20;

' Figs. 20 and 21 are sectional views taken on the lines 20-20 and 21-21, respectively, of Fig. 19; and

Fig. 22 is an enlarged sectional view taken substantially on the line 22-22 of Fig. 4.

In the present embodiment of my invention characterized by a so-called vertical machine, the melting pot and its accessories, and the die members and their supporting means and cooperating parts are respectively located and independently mounted on a bed, but adapted for cooperation in a particularly advantageous manner. The main driving mechanism is aso located on the base, so that in effect, there are three distinct groups of mechanism. so co-ondinated however, as to produce a complete cycle of operations, resulting in the production of a die casting. These groups of mechanism will be described in the order named. 4

Referring first to the metal melting po and appurtenant parts, it will be observed that-this group is mounted on a supporting bracket 26, in turn rigidly mounted on one end of a heavy cast iron base 27. Upon the support 26 is mounted a suitable fire box 28 lined with fire brick and carrying a melting pot designated generally by 29. The melting pot has a flanged edge 31 resting on the top of the fire box '28 and the open top of the pot is closed by a cover 32 having a charglng opening 33 adapted to be closed by'a door 34. I propose to firmly damp and lock this charging door in closed position to positively prevent admission of air to the melting pot and consequent oxidation of the metal. As shown, the door 34 is pivotally supported at 35 by a pair of levers 36 fixed to a rock shaft 37 mounted on the cover 32 and forming a fulcrum for the levers. One end of the shaft 37 is extended to provide a cranked handle 38 by means of which the charging door may be swung back and forth. To the outer end of each lever 36 is pivoted a clamping lever 39 having an eccentric finger 41 engageable with a latch 42 for clamping and locking the charging door in closed position, as will be obvious. By swinging the clamping levers 39 upwardly, they will be released from the latches, permitting the hand crank 38 to be operated for opening the charging door. The levers when swung upwardly are supported by stops 40 above and out of contact with the cover 34.

The melting pot may be heated by any suitable means, such for examp'e as gas burners 43, a series of which are mounted in the fire box beneath the melting pot, each equipped with an individual valve 44 connected with a cross-head mixture supply pipe 45. The proper gas mixture is obtained by mixing gas from pipe 45 with air from pipe 45 in the T 45. A door 46 is provided at one side of the fire box for inspection of the burners.

The melting pot is shaped to provide a goose neck pressure chamber designated generally by 47, having a centrally disposed pressure inlet end 48, to which is connected a fluid pressure (preferably air) supply pipe 49, and the opposite end of the chamber terminates in a restricted discharge opening 51, to which is connected a metal injecting nozzle 52 adapted to align with the dies to be later described. A metal flow valve in the form of a punger 54 is adapted to be moved vertically by a lever 55 above the melting pot for opening and closing a port 56, at the low point of the melting pot to thereby control the supply of molten metal to the chamber 47 as is well understood in this art. The means for operating the metal flow valve 54 and for admitting fluid pressure to the chamber 47 for the purpose of squirting a charge of molten metal through the nozzle 52, will be described hereinafter.

Referring now to the second group of apparatus. viz: the die members and their supporting and cooperating parts, it will be observed that these and likewise the core-pulling devices or apparatus are co-ordinated on a carriage which is slidable horizontally on the base forwardly toward the melting pot on the base 27 and carrying a. rigid upstand ing carriage frame designated generally by 59. This carriage frame has side walls 61 and 62, joined by a front wall 63. The upper end of the carriage frame is braced by vertical brace rods 64 connected at their lower ends to the carriage base and at their upper ends through the agency of a bracket 65 to the carriage frame. The front wall 63 of the carriage frame has vertical dove-tail ways 66 upon which upper and lower crossheads designated generally by 67 and 68 respectively, are vertically slidable. Each cross-head has a horizontal portion 69 to which one or more die members are adapted to be bolted or otherwise secured. In the present example. I have shown for purpose of illustration, die members 71 and 72 disposed intermediate and bolted to the horizontal portions 69 of the cross-heads 67 and 68 respectively. The casting formed in the mold thus provided is indicated by 75. The molten metal will be injected into the mold through the ingate 76, Fig. 9, as described later. It will, of course, be understood that the present dies are simply for purpose of illustration.

Mechanism is now the cross-heads 67 and close and open the dies prises a pair of cylinder cams 77 and 78 fixed to a vertical shaft 79 disposed intermediate the sides of the carriage frame and journaled in suitable bearings carried by brackets 81, fixed to said frame. The cams 77 and 78 operate cross-head levers 82 and 83 respectively, through means of suitable roller and cam; connections, and said levers fulcrumed intermediate their ends at 84 on the carriage frame are respectively connected by links 85 and 86 to the cross-heads 67 and 68. Said links are adjustably connected by nuts 87 to the cross-head levers to vary the approach of the cross-heads. The cam wayoneach cam is identical except that they are reversed to simultaneously feed the cross-heads toward and away from each other. A development of the cam 77 is shown in Fig. 6, in which the functions of the cam are specified. It will be understood, however, that this example is simply for purpose of illustration. The mechanism for driving the cam shaft 79 will be described hereinafter, it being sufficient to note at this point that when the machine is in the idle position shown in Fig. 1, the cross-heads and die members are in separated relation held open by the cam portions 88. When the machine is started as will be described later. the cam portions 89 will close the dies and during the interval determined by the cam portion 91. a charge of molten metal will be injected into the mold formed by the dies. The cam portion 92 separates or opens the dies, and during this opening movement the provided for moving 68 on the ways 66 to or mold. This comcasting will be ejected from the die members by ejecting rods 93. These rods as shown in Figs. 5 and 13, pass through the horizontal portion 69 of the cross-heads and are attached to the ejector pin plates which they operate and are guided and controlled by brackets 94 interposed between and fixed to the brace rods 64. Each ejector rod is equipped with a pair of inner lock nuts 95 and outer lock nuts 96 positioned so that when the dies are closed as shown in Fig. 5, they will ensure withdrawal of the ejector pins into proper position to permit the metal to be poured into the mold. When, however, the die members open, the nuts 95 will be brought into engagement with the brackets 94, thereby causing the ejector pins to be projected into the mold to eject the casting as the die members continue to separate. These ejector rods and the pins controlled thereby will obviously be brought into proper relation to the die members when said die members are again closed.

The core-pulling apparatus will now be described. reference being had more particularly to Figs. 9, 10, 12, 13 and 17. Upon the upright cam shaft 79 is fixed a core-pulling cam 98, in the cam way of which is located a follower roller 99 carried by a rack 101. This rack slidably supported by the casting 102 fixedly mounted between and upon the sides 61 and 62 of the carriage frame, is adapted to be moved back and forth by and radially of the cam 98. A spur pinion 103 meshing with said rack is fixed to a cross shaft 104 journaled in bearings carried by the bracket 102, which shaft is equipped at each end with a bevel gear 105. Each bevel gear 105 meshes with a complemental bevel gear 106 fixed to a sleeve 107 suitably journaled on the carriage frame. Each sleeve 107 drives through intermediate mechanism, a. pair of core-pulling devices located on the adjacent side of the carriage frame, one core-pulling device being provided for each end of a die member. Inasmuch as the corepulling apparatus at each side of the machine is similar, a description of one will apply to both. As shown in Fig. 17, the sleeve 107 is provided at its other end with a fixed spur insert 111. A shiftable clutch-112 splined on the shaft 108 extending through the sleeve and having clutch teeth complemental to those on the gear 109, is adapted to be movedinto and out of engagement with the latter. A spring-pressed ball 113 serves by engagement in either of the notches 114 or 115 to locate and hold the shiftable element- 112 in the clutch engaged or disengaged position. The gear 109 drives a spur gear 116 loose on a shaft 117 in turn journaled on the carriage frame. Driving connection between the gear 116 and the shaft 117 may be established at will by means of the manugear 109 carrying a clutch tooth 79, (which idly mounted on ally shiftable clutch element 118 similar in construction and operation to the clutch element 112 just described. Each shaft 108 and 117 is adapted to operate a core-pulling device comprising as shown in Figs. 9 and 13, a. core element 119 connected to a rack member 121 slidably mounted on a bracket 122 fixed to its respective cross-head. The connection between each of said shafts 108 and 117 and its core-pulling rack comprises a pinion 123 meshing with said rack, and telescoping shaft members 124 connected at opposite ends by means of universal joints 125 to the pinion 123 and its respective driving shaft. From the foregoing, it will be manifest, with the parts in the core-inserted position shown in said figures, that when the cam 98 is revolved in a clockwise direction vie-wing Fig. 9, the operating trains between said cam and the several core elements will be operated to simultaneously pull the cores. That is, the rack 101 will be drawn inwardly, thereby revolving the gears 105, 106, 109 and 116 and the shaft connections between the latter two gears and the core-pulling pinions and racks. Any one core-pulling device may obviously be disconnected from this driving mechanism by disconnecting its respective toothed Clutch. Furthermore, the timing of the core-pulling operation of any core element with respect to other operations, may be varied simply by withdrawing the selected clutch element and rotatably adjusting it with respect to its driving gear. It follows, therefore, that inasmuch as the core-pulling cam is driven by the cam shaft as will be presently seen is driven in timed relation with the mechanism for feeding the die carriage into and out of nozzle tension position) said adjustment enables the cores to be pulled either before or during separation of the dies, or at any time governed by the circumstances of any particular job.

Coming now to the drive mechanism, it will be observed that this is carried by a supplemental base bracket 119, in turn rigthe main base at the end opposite from the melting pot. Said mechanism includes a driving friction clutch pulley 80 loose on a driven shaft 90 in turn suitably journaled in bearings 100 carried by the supplemental base part. This clutch pulley, of a standard construction, is adapted to be engaged by the expanding action of a pair of levers 110. A shiftable clutch cone 120 on the shaft 90 is employed for expanding the arms 110, said clutch cone being operated by fluid pressure as shown in Fig. 22. The fluid pressure (air) clutch includes an guter cylinder body 126 fixedly supported cylin der wall 128. uponwhich a piston 129 is reciprocable.- The piston is equipped at its head with cup leathers 131 secured in a bracket 127 and carrying an inner position by a cup ring 132, and at its up posite end is connected to the clutch cone 120. A cylindrical head 133 threadingly engaged on the outer cylinder body, carries a suitable stufiing box sealing the piston passage. Air pressure may be admitted to opposite ends of the cylinder through passages 134 and 135 for moving the piston back and forth. The shaft 90 carries a worm 136 meshing with a worm gear 137 journaled in a casing 138 and held against axial translation therein. 1 shaft 139 splined and supported at one end in the hub of the worm gear 137 is journaled at its opposite end in a bearing 141 carried by the carriage'frame. The shaft 139 in turn is held against axial translation in the bearing 141, and conse ucntly travels with the carriage frame. aid shaft'139 carries a cylinder cam 142, a development of which is shown in Fig. 7. In the annular cam way of this cam is located a roller 143 carried by a draw bar 144 adjustably secured to a bracket 145 fixed to the supplemental base part 119. By rotation of the cam 142 through engagement of the air clutch, just described, the die carriage will be moved forwardly and backwardly on the base in the cycle noted in Fig. 7. The shaft 139 carries at its forward end a fixed bevel gear 146 meshing with a bevel gear 147 fixed to the, vertical cam shaft 79. Thus, the die opening and closing cams 77 and 78, the core-pulling cam 98, and the carriage feed cam are simultaneously driven from a common driving means, and it follows that the cam-driven mechanism will be operated in predetermined timed relation.

Said drive mechanism also drives a cam shaft 148 through the agency of spur gears 149, 150 and 151, and said cam shaft carries an air injector cam 152 and a metal flow cam 153, best shown in Figs. 4, 8 and 11. A roller 154 following the cam 153 is carried bv a vertical lift rod 155'urged downwardly by a spring 156, said lift rod being pivot ally connected at its upper end to the metal flow valve lever 55 referred to above. The cam 153 is designed to raise and lower the metal flow valve 54 at the proper times. The cam 152 is designed to effect instantaneous injection of air into the pressure end 48 of the pouring chamber 47 described above. This cam operates a roller follower 157 and a fixed follower 158, the latter of which is adapted to ride on a cam shoe 159. These followers attached to the lower end of a valve lifter or tappet rod 161, are urged downwardly against the cam surfaces by a spring 162. The tappet bar under control of the rotary cam just described, is designed to actuate an air injector valve comprising a pair of poppet valves 163 and 164 carried in a casing 165 mounted on a bracket 160carried by the fire-box 28. This cam raven? construction provides for quick opening of the air supply valve to effect instantaneous injection of the molten metal into the mold. This quick action is obtained by the abrupt radial surface at the heel end of the cam shoe 159, permitting the follower 158 to drop instantly and more rapidly than is possible with the ordinary cam and roller action; It will be seen that this quick cam action causes the upper tappet finger 166 on the tappet rod 161 to open the spring-seating poppet valve 164 as shown in Fig. 18, allowing the fluid pressure (air) to pass from the supply chamber 167 through the chamber 168 and the pipe 49 mentioned above, to the pressure end of the pouring chamber 47. thereby forcing a charge of metal from said pouring chamber, as shown 'in Figs. 2 and 3. The air pressure will, of course, be appropriate for the particular metal and shape of the casting so that the metal will be instantaneously forced into the mold. Subsequently, the cam 152 will raise the rod 161 causing the upper tappet finger 166 to close the valve 164 to shut off the air supply and causing the lower tappet finger 169 to unseat the exhaust valve 163 to relieve the pressure on the metal in the pouring chamher;

The fluid clutch described above for putting the machine into and out of operation is controlled by manually and automatically operated valves which will now be described. This clutch shown in Fig. 22, is connected by pipes 171 and 172 to a four-way valve comprising (Fig. 14) a casing 173 and a retary valve 174 having passages 175 and 176 adapted to register with the four passages in the casing 173. The valve-member 174 may be manually oscillated by means of the control lever 177. The casing 173 is also connected by pipes 178 and 179 to a valve casing 181 as shown in Figs. 14 and 19. Said casing 181 supported in a stationary posi-' tion by a bracket 182 on the base, carries an upper and a lower pair of spring-seating poppet valves 1834184 and 185-186. respectively. These valves are adapted to be actuated by upper and lower tappet fingers 187 and 188. carried by a tappet rod 189 vertically slidable in bearings 191 in the casing 181 and equipped at its lower end with a roller 192 adapted to he raisedand lowered by a cam 193 on the carriage base 57. The air pressure taken into the casing 181 through the air-supply pipe 194 is adapted to be alternately delivered by action of the poppet valves to the pipes 178 and 179 according to the position of the tappet rod 189, and through said pipes to the four-way valve and thence to the fluid pressure clutch. I

These poppet valves comprise. in effect. an automatic reversing valve. The four-way valve is a manually operated reversing valve. The purpose of these valves is to enable the operator to put the machine into operation by manipulation of the control lever 177 to engage the fluid pressure clutch, and to automatically disengage said clutch after a cycle of operations by automatic action of the poppet valves. Referring now more particularly to Figs. 1, 14 and 19, in which the clutch is disengaged and the machine is in idle position, it will be seen that the roller 192 is elevated by the cam 193, thereby causing the tappet finger 188 to open the valves 185 and 186. This permits the air pressure to pass the valve 185 and communicate with the pipe 178 through a horizontal passage 190, a vertical passage 195, and a second horizontal passage 196 communicating directly with said pipe 178. iVith the position of the control lever 177 as shown in Fig. 14, air pressure will be admitted through the pipe 172 to the clutch, thereby disengaging the same, as shown in Figs. 14' and 22, the exhaust passing back through the pipe 171, the passage 176 in the four-way valve, the pipe 179. the open valve 186, and out through the exhaust port 197. When now it is desired to engage the clutch to start the machine, the operator swings the control lever 90 degrees in a counterclockwise direction viewing Fig. 14. to the position shown in Fig. 15. This shifting of the four-way valve directs the supply pressure to the pipe 171 and the passage 134, Fig. 22, thereby forcing the piston to the opposite end of the cylinder and engaging the clutch. The air thus displaced by the piston passes back through the pipes 172179 and through the port 197 in the poppet valve casing as shown in Fig. 15. The machine having been thus put in op eration, the die carriage will be fed forwardly until the roller 192 rides off the cam 193, thereby lowering the tappet rod 189 and reversing the action of the poppet valves. as shown in Fig. 16; but the effect of this reversing action on the clutch is precluded by the operator swinging the control lever from the position shown in Fig. 15 to that in Fig. 16. That is. the upper poppet valves 183 and 184 will be opened by the tappet finger 187 and the lower poppet valves will be closed by their respective springs. The air will pass through the valve 183, and a horizontal passage 198 in the valve casing, down through a longitudinal passage 199 and through a second horizontal passage 201 communicating directly with the pipe 179. At this instant. it is necessary for the operator to swing the control lever 177 to the position shown in Fig. 16, to continue delivery of the air pressure from the pipe 179 to the pipe 171 to maintain the clutch engaged. In this position, the exhaust passes back through the pipe 172, the four-way valve, up through the valve 184 and exhausts through the port 202. This condition of the valve maintains until the cycle has been completed, at which time the cam 193 will lift the tappet rod 189, thereby reversing the poppet valves, as shown in Fig. 14, and causing the clutch to be disengaged. The cam 193 may be adjusted on the carriage base to vary the stopping point, and in some 1nstances it is desirable to employ more than one cam on the carriage base, such for example as the cam 203 indicated in dotted lines in Fig. 1, for the purpose of stopping the forward travel of the die carriage before the nozzle is reached and the dies closed. for the purpose of inserting a special core or other hand-operated device in the mold. It should be understood. however, that my invention is in no way limited to the particular form of valve mechanism for controlling the fluid pressure clutch, as other forms might be employed to the same end.

A complete cycle of operations is as follows, reference being had particularly to Figs. 6, 7 and 10, which plainly show the action of the die closing and opening cam, the carriage-feed cam and the core-pulling cam respectively, and the co-operative relation of these cam functions. The idle position is shown in Fig. 1; and when the operator desires to start the machine, he swings the control lever 177 to the position shown in Fig. 15, and then back to the position shown in Fig. 16 as described above, for the purpose of engaging the fluid pressure clutch. This causes all of the cams to be operated in positively timed relation. The die carriage will then be fed forwardly and at the same time the'die members will be moved together to close the mold. As shown in Figs. 6 and 7 the dies will be closed prior to the nozzle tension position, so called because the die box or rather the ingate portion thereof is pressed against the seat of the metal injecting nozzle 52, in which position the metal may be delivered through said nozzle into the mold. During the die closing movement the cores start in as indicated in Fig.10, and after the nozzle tension position is reached, the air injector cam 152-- 159 will open the air valve 164, Fig. 18. causing a charge of metal to be instantaneously squirted with proper pressure through the nozzle 52 into the mold. Before the cores start out. the exhaust valve 163 will be opened by the valve 152 to relieve the pressure on the metal in the pouring chamber, and subsequently the carriage will be started backward to withdraw the dies from the nozzle tension position. While the carriage is backing away, the dies will be opened and during this time the cores will be withdrawn. Thedies remain open and the cores retracted during the idle position; and during this idle period the metal flow valve 54 will be raised by its cam to replenish the pouring chamber. It will be understood that this particular cycle of operations is for purpose of illustration merely and that the invention comprehends appl1cation of the principles disclosed herein to suit the various conditions and requirements of different die-casting jobs for which a machine of this kind is intended.

As regards the relative location of the melting pot and the die carriage, it will be observed that the dies are in fact only temporarily near the melting pot, that is, during the nozzle tension position. It follows, therefore, that the temperature of the dles may be easily controlled and maintained at an even temperature, which is an important factor in the production of high grade die castings, and furthermore, the frame of the machine is notsubjected to excessive heat which would tend to warp and weaken its structure.

It is believed that the foregoing conveys a clear understanding of the objects and principles prefaced above, and while I have illustrated but a single working embodiment, it should be understood that considerable change might be made in the construction and arrangement without departing from the spirit and scope of the invention as expressed in the appended claims:

I claim:

1. In adie-casting machine, the combination of a stationary melting pot and metal-injecting nozzle, and vertically sepa' -rable die members remote from said melting pot and nozzle and adapted to be opened and closed and to be moved laterally into and out of nozzle tension position.

2. Ina die-casting machine, the combination of a stationary melting pot, pouring chamber and nozzle, a horizontally movable carriage equipped with separable die members. and mechanism for closing and opening the die members and for moving the carriage horizontally to bring said members into and out of a nozzle tension position.

3. In adie-casting machine. the combination of a melting pot, a. pouring chamber. a. stationary nozzle. vertically separabledie members. and mechanism, for closing and opening said die membersand for moving them horizontally into and out of a nozzle tension position.

4. In a. die-casting machine, the combination of a base, a melting pot on the base having a stationary metal-injecting nozzle, a carriage slidable horizontally on the base toward and from said nozzle, and vertically separable die members on the carriage adapted to be moved by the latter into and mounted on and movable with said carriage, a die member on each cross-head, means movable with the carriage for moving the cross-heads in die closing and opening movements, and means for moving the carriage to bring the die members into and out of nozzle tension position.

6. In a die-casting machine, the combination of a melting. pot, a metal-injecting nozzle, a reciproeable carriage, separable die members on said carriage, cam-operated means movablewit-h the carriage for closing and opening the die members, and means for relatively moving the die members and said nozzle to bring said parts into and out of nozzle tension position.

7. In a die-casting machine, the combination of a stationary melting pot having a metal injecting nozzle, a horizontally movable carriage, separable die members on the carriage, a rotary cam for moving each die member from an open to a closed position, and a rotary cam for moving said carriage to carry the die members into and out of nozzle tension position.

8. In a die-casting machine, the combination of a melting pot, a metal-injecting nozzle, a carriage horizontally slidable toward and from said nozzle, a pair of cross-heads vertically slidable on the carriage, a. die member on each cross-head, a vertical cam shaft on the carriage, cams on said shaft, means operated by said cams for vertically moving said cross-heads to close and open the die members, and means for moving said carriage into and out of nozzle tension position.

9. In a die-casting machine, the combination of a base, a stationary melting pot on said base equipped with a metal-injecting nozzle, an upright carriage horizontally slidable onthe base toward and from the melting pot, upper and lower cross-heads vertically slidable on thecarriage, a die member carried by. each cross-head, a crosshead lever on the carriage for vertically moving each cross-head. cam means on the carriage for rocking said levers to close and open the die members, and drive mechanism on the base for operating said cam means and for moving the carriage into and out of nozzle tension position.

10. In a die-casting machine, the combination of a base, a stationary melting pot on said base equipped with a metal-injecting nozzle, an upright carriage horizontally slidable on the base toward and from the melting pot. upper and lower cross-heads vertically slidable on the carriage, a die member carried by each cross-head. a crosshead lever on the carriage for vertically moving each cross-head, cam means on the carriage t'or rocking said levers to close and open the die members. drive mechanism on the base. a cam shaft associated with the carriage and driven by said mechanism, a cam on said shaft for moving the carriage horizontally, and a driving connection between said sha'ft and said die-operating cam means.

11. In a die-casting machine, the combination of a base, a melting pot and metalinjecting nozzle stationary on the base, drive mechanism on the base, a carriage movable on the base toward and from the melting pot and having separable die members, and cams traveling with the carriage and operated by said drive mechanism for closing and opening the die members and't'or mov ing the carriage to and from the nozzletension position.

12. In a die-casting machine, the combination of a base, a melting pot and metalinjecting nozzle stationary on the base, drive mechanism on the base, a carriage movable on the base toward and from the melting pot and having separable die members, cams traveling with the carriage and operated by said drive mechanism for closing and opening the die members and for movin the carriage to and from the nozzle tension position, and control means for said drive mechanism operated in part by movement of the carriage.

13. In a die-casting machine, the combination of a stationary melting pot, a carriage movable toward and from the melting pot and equipped with separable die mem bers and core-pulling mechanism, a carriage feed cam, a die opening and closing cam and a core-pulling cam carried by said carriage, and driving means for operating said cams.

14. In a die-casting machine, the combination of a stationary melting pot, a carriage movable toward and from the melting pot and equipped with separable die members and core-pulling mechanism. a carriage feed cam, a die opening and closing cam, and a core-pulling cam, both mounted on and movable with said carriage, and driving means for operating said cams including a fluid pressure clutch.

15. In a die-casting machine, the combination of a pouring chamber having an air pressure end and a nozzle end, an air injector valve connected with said pressure end, a carriage movable toward and from said nozzle end and equipped with separable die members and core-pulling mechanism, a cam for operating said injector valve, :1 carriage feed cam. a rotary die opening and closing cam and a rotary core-pulling cam mounted on said carriage, and drive means for operating said earns.

16. In a die-casting machine, the combination of a pouring chamber having an air pressure end and a nozzle end, an air injector valve connected with said pressureend.

a carriage movable toward and from said nation of separable die'members, means. for

closing and opening said die members, a core-pulling device movable with each d e member, and means for operating said corepulling devices to pull the cores, said means including an adjustment whereby the cores may be timed to pull either beforeor during separation of said die members.

18; Ina die-casting. machine, the coinbi-.

nation of separable die members, means for closing and opening said die members, a core-pulling device movable with each die member, a pair of intermeshing gears, an operating c'onnection between each gear and one of said core-pulling devices, and means for driving one of said gears to operate both core-pulling devices.

19. In a d1e-cast1ng machine, the combination of separable die members, means for closing and opening said die members, a core-pulling device movable with each die member, a pair of intermeshing gears an operating connection between each gearand one of said core-pulling devices, means'for driving one of said gears to'operate both core-pulling devices, means for operating said die closing and opening means and said core-pulling driving means in timed relation, and means for varying said timed relation to cause the core-pulling devices ,to pull the cores at relatively diflerent times with respect to the movement of the die members.

20. In a die-casting machine, the combination of separable die members, a'corepulling device for each die member. intermeshing gears, a driving connection between each gear andone of said core-pulling devices. and cam-operated means for driving one of said gears to simultaneously operate said core-pulling devices.

21. In a die-casting machine, the combination of separable die members, a corepulling device movable with each die memher, a pair ofintern'ieshing gears, a driving connection between each gear and one of said core-pulling devices, andmeans for driving one of said gears, whereby to operate both core-pulling devices in unison.

22. In a die-casting machine, the combination of relatively movable die members. a core-pulling device movable with one of the die members, a drive shaft, and an extensible shaft having a universal connection at one end with said core-pulling device and another at its opposite end with said drive shaft, and adapted for operatingsaid core-pulling device at any position of the die member or during movement thereof. a 23'. In a die-casting machine, the combination of a metal-injecting nozzle, a carriage movable toward and from said nozzle and equipped with a pair of separable die members, a core-pulling device associated With each die member, mechanism for closing and opening the die members and for moving the carriage into and out of nozzle tension position, and a cam carried by said carriage ,for operating said core-pulling devices.

24. In a die-casting machine, the-combination of a metal-in ecting nozzle, a carriage -movable toward and .from said nozzle and equipped witha pair of separable die member", a core-pulling device associated with each die member, mechanism for closing. and opening the die members and for moving the carriage into and out of nozzle tension position, and means mounted on the carriage for operating said core-pulling device said means being adjustable to pull the cores either before or during separation ofthe die members. v

- 25. In a die-casting machine. the combination with die members, core-pulling mechanism comprising a core-pulling member associated with each die member, a rack on each core-pulling member, a pinion meshing with each rack, a pair of intermeshing "driving gears, and a driving connection between each driving gear and one of said pinions.

26. In a die-casting machine, the combination with die members, core-pulling mechanism comprising a core-pulling member associated with each die member, a rack on each core-pulling member, a pinion meshing with each rack, a pair of intermeshing drivrack, a pair of 'intermeshing driving gears,

and a driving connection between each driving gear and one of said pinions, each connection including means for relatively ro tatably adjusting its pinion and driving gear.

28. In a die-casting machine, the combination of a metal-injecting nozzle, a carriage movable toward and from saidv nozzle, a pair of separable die members on said carriage, a core-pulling device movable with each die member. means for closing and opening the die members, means for moving the carriage into and out of nozzle tension position, and means carried by the carriage tion of separable die members, a core-pulling device, means for closing and opening the die members, and meansfor operating said core-pullin device to pull the core at a predetermine time in relation to closing and opening the die members said means including adjustable mechanism for vary-.'

ing the time at which said core will be pulled.

30. In a die-castin machine, the combinaof a pair of separab e die members, a core pulling device at each end of each die member, a pair of intermeshing gears for both the core-pulling devices at each end of said die members, connections between each pair of gears and its respective core-pulling devices, and a common means for driving said gears to operate the core-pulling devices. v

31. In a die-casting machine, the combination of a pair of separable die members, a core-pulling device at each end of each die member, a pair of intermeshing gears for both the core-pulling devices at each end of said die members, connections between each pair of gears and its respective core-pulling devices, a core-pulling cam, and means oper .ated by said cam and in driving connection with one gear of each pair, whereby said core-pulling devices will be operated from said cam.

32. In a die-casting machine, the combination of a stationary melting pot having a metal-injecting nozzle, a carriage movable toward and from said nozzle, a pair of separable die members on. said carriage, a core-pulling device movable with each die member, means for closing and opening the die members, means for moving the carriage into and out of nozzle tension position, and means on the carriage for operating the core-pulling device in predetermined time relation with said die and carriage moving means said means including an adjustable clutch for varying the time of operation of said core pulling device.

33. In a die-casting machine, the combination of a stationary melting pot having a metal-injecting nozzle, a carriage movable toward and from said nozzle, a pair of separable die members on said carriage, a core-pulling device movable with each die member, adjustable means for varying the time of operation of said devices, means for closing and opening the die members, means for moving the carriage into and out of nozzle tension position, and drivin mechanism for operating said die, carriage and core-pulling operating means including a fluid pressure clutch.

34. In a die-casting machine, the combination'of a melting pot, a metal-injecting nozzle, a carriage equipped with separable die members and movable with respect to said nozzle into and out of nozzle tension position, mechanism including rotary cams for closin and opening the die members and moving t e carriage into and out of said nozzle tension position, and fluid pressure control means includin a fluid pressure clutch for controlling said mechanism.

35. In a die-casting machine, the combination of a melting pot, a pouring chamber having a nozzle, a metal flow valve between said pot and chamber, means for admitting fluid'pressure to the chamber for injecting a charge of metal, a carriage movable to-' ward and from the nozzle and equipped with separable die members, a control member, mechanism rendered operable by said control member for automatically closing the die members, moving the carriage forwardly to a nozzle tension position, opening said metal flow valve admitting fluid pressure to said chamber, retracting said carriage and opening the die members, and means for automatically stopping the mechanism at the end of the cycle.

36. In a die-casting machine, the combination of abase, a melting pot and accessories therefor mounted on one end of the base, drive mechanism mounted on the opposite end ofthe base, a carriage slidable horizontally on the base intermediate said melting pot'and drive mechanism and carrying separable die members, and means including I WILLIAM a. HEiNzE.

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