US1719764A - Die-casting machine - Google Patents

Description

July 2, 1929. J. s. GULLBCRG DIE CASTING MACHINE 8 Sheets-Sheet Filed June 8, 1927 NWN N QN EN SN NNN NQ. www

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DIE CASTING MACHINE Filed June 8, 1927 8 Sheets-Sheet 5 l /09 za@ July 2, 1929. J. s. GULLBORG 1,719,764

DIE CASTING MACHINE Filed June 8, 1927 8 Sheets-Sheet 6 /ff H4! 237 July 2, 1929. J, 5 GULLBQRG 1,719,764

DIE CASTING MACHINE Filed June 8, 1927 8 Sheets-Sheet 7 July 2, 1929. 1 Q GULLBORG 1,719,764

DIE CASTING MACHINE Filed June 3, 1927 8 Sheets-Sheet 8 Patented July 2, 1929.

j UNITED STATESV PATENT oFFlcE.

JOHN S. GULLBORG, OF CHICAGO, ILLINOIS, ASSIGNOR T0 ALEMITE DIE CASTING AND MANUFACTURING COMPANY, 0F CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

DIE-CASTING MACHINE.

Application led June 8,

This invention relates to die casting ma-V chines, and more particularly'to a machine employing core members in conjunction with the die mold, and pneumatic means for injecting the molten metal into the mold.

In die casting machines of the character referred to the cast metal in the mold shrinks about thel core necessitating relatively great power for extracting or withdrawing the cores from the molds. One of the objects of the presentinvention is, therefore, to pro vide a suitable arrangement of shafts and levers 'whereby the power for pulling the cores can be readily developed without necessitating the revision of a machine of unusual size which would be objectionably cumbersome and heavy. In the machine of the application the parts are so arranged as to provide a neat `and compact structure capable of developing relatively great power for pulling the cores.

I have found that, in die casting machines it is very desirable to have means whereby injection of the metal into the mold is prevented When the mold is closed, to permit adjustment of parts, cleaning of the mold section, etc. without danger to the operator due to injection of molten metal into the inold when the mold is not tightly closed.

As a further protection to the operator I provide shield members which are raised and lowered in synclironism with the operation of the machine, these shield members being lowered so as to be positioned about the mold during the actual casting operation in which the molten metal is kinjected into the mold under pressure. The means for oper! ating these shield members cooperate with the means for preventing injection of the metal into the mold in such manner that the shields are held in inoperative or raised position when the safety means referred to 1s operative to prevent injection of metal into the mold., thus permitting the mold sec tions and associated parts t-o be readily viewed and giving ready access. to such members for adjustment thereof. The means for operating the shields and for controlling the air pressure for injecting the molten metal into the mold is also'adapted to permit independent raising of the shields when they are in lowered or operative position, thus permitting access to the mold from either side of the machine. This is of practical importance as doing awaywith the necessity 1927. serial no. 197,337.

for' raising both of the shields when it is desired to have access to one side of the mold only.

As the molten metal is injected into the mold under high pressure, approximately 350 pounds tothe square inch, the cast articles have a tendency to adhere to the mold at times and it is desirable to provide means for loosening or stripping the articles from the mold. For this purpose I provide, in conjunction with the movable section of the mold, a plurality4 of stripping pins and a plate therefor. To operate this plate I provide means for limiting movement of the plate with the movable mold section, such means exerting a leverage effect on the plate providing very appreciable power for moving the plate, at the end of its travel in either direction with the movable mold part, `oppositely to the mold section. This insures insertion and withdrawal of the pins into and from the mold lsection at proper time facilitating stripping of the work from the mold. This means for operating the stripping pins is also capable of adjustment to cause movement of such pins and, consequently, the plate `toward the movable mold section so as to cause such pins to project into the mold during the molding or casting operation. In this case the pins are not employed as stripping members, but are replaced'by aA corcto provlde a suitable opening in the` article cast or molded.

To insure accuracy of operation I provide means whereby the connection between the cores and the operating means therefor can be ,adjusted to vary the timed relation of the operation between such cores, this means also being capable of adjustment tov vary, within limits, the leverage effect exerted on the re-` spective cores for withdrawing the same. This adjustability of `parts renders it possible to so dispose the operating mechanisms for the cores that such parts are disposed substantially on dead center when the cores are in operating position in the mold, thus locking. these parts against displacement during injection of the molten metal into the mold. Further objects and advantages will appear from the detail description.

In the drawings Fig. 1 is a plan view of a die cast-ing machine constructed in accordance with my invention, the shields being omitted and indi-` cated in broken lines;

f shaped recess in the upper arm 13a of an Fig. 2 is a left side view of the machine with the mold open;

Fig. 3 is a View similar to Fig. 1 with the mold closed; v

Fig. 4 is a right side view of the machine with the mold open;

Fig. 5 is a front view ofthe machine;

Fig. 6 is a rear view of the-machine;

Fig. 7 is a section taken substantially on line 7--7 of Fig. 2;

Fig. 8 is a detail of the drive and reverse mechanism;

Fig. 9 is a sectional detail of the adjustable eccentric connection of one of the core operating arms;

Fig. 10 is a detail, partly in section, of the `handle and associated parts for operating thesafety lock;

' Fig. 11 is a detail of the air switch safety control bars;

Fig. 12 is a semi-diagrammatic view of a modified form of toggle operating lever and associated parts;

Fig. 13 is a fragmentary detail showing the manner of using the stripping pin lever for pulling a core;

Fig. 14 is a detail, partly in section, of

the mounting of one of the core supportmg arms.

The machine includes a main frame including a table or bed 1 supported by suitable uprights or leg members 2, -the bed and the legs being suitably braced and connected together. A tank or furnace 3 is suitably supported at the front of the machine for containing the molten metal, the furnace illustrated being gas heated, though it will be understood an electrically heated furnace or any other suitable or preferred type of furnace can be employed. A ladle 4 operates in the tank of furnace 3, this ladle being arched or curved upwardly at its inner portion and provided at its inner end with a nozzle 5 adapted to fit into the gate or sprue opening of the die mold formed, in this instance, of two sections 6 and 7. A particular construction of the furnace and the ladle is disclosed in my patent, for Die casting machine,I Number 1,637,566, dated August 2, 192.7. It is not necessary to illustrate or describe in detail the construction of the furnace and ladle, it being understood that any suitable furnace or ladle can be employed.

0 'I `he upper portion of the ladle 4 is rlgidly secured by bolting` or otherwise to the blght portion of a U-shaped frame 8, the arms of which are pivotally secured at their outer ends, at 9, to the upper ends of the arms of a yoke 10 the base 11 of which 1sprovided with a dove-tail under portion 12 slidably mounted in a correspondingly L-shaped bracket 14, the vertical arm 'of which is similarly mounted in a supporting and guide member 15 depending from a front bar 16 secured across the front end of the main frame. The bracket 14 is adjusted on member 15 by an adjust-ing screw 17, in a known manner, the yoke being adjusted 0n arm 13EL in a similar manner by means of a screw 18. The ladle is thus supported for swinging movement about a horizontal axis extending transversely of the front of the main frame of the machine, and is capable of horizontal and vertical adjustment to insure proper register of the nozzle 5 with the sprue opening of the die mold.

A drum shaft 19 is rotatably mounted transversely of the machine and adjacent the rear end thereof in bearing blocks 20 of the main frame. Two drums 21 are secured on this shaft for rotation therewith. Each of these drums is provided, in its inner face,

with a box cam 22. Each drum is also provided with a circumferential box cam 23. These cam drums are similar to the cam drums disclosed in my Patent 1,322,502 of November 19, 1919. The end box cams receive rollers 24 mounted at opposite sides of the rear end of a lever 25 rockably mounted on the lower portion of the main frame adjacent its forward end, at 26. The pivot rod 26 upon which the forward end of lever 25 is mount-ed passes through cross pieces 27 at opposite sides of the main frame and secured to two adjacent uprights or legs of this frame As will be noted more clearly from Fig. 5, the front or forward end of lever 25 is bolted or otherwise suitably secured to flanges 28 at the inner ends of the sleeves 29 rockably mounted upon the pivot rod 26. The sleeves 29 are held against inward movement toward the ends of the rod 26 by collars 30 secured on the rod by set screws. Each sleeve is provided, at its outer end, with an arm 31 extending forwardly therefrom and pivotally secured at its forwardend by a pin 32 in the lower end of the bifurcated clevis 33. A connecting rod 34 is threaded into the upper end of clevis 33 and secured in adjustment therein by a jaln nut 35. The upper portion of this rod is slidably mounted in a clevis 36 pivoted at 37 to the inner end of the U- shaped support-ing frame 8. An expansion coil spring 38 is mounted about the rod 34 and confined between the lower end of clevis 36 and a washer 39 held in adjustment on the rod by a nut 4() threaded thereon. Upon rotation of the drum shaft and, consequently, the drum, the lever 25 is rocked about the pivot rod 26 alternately raising and lowering the ladle 4, the nozzle 5 thereof fitting snugly into the sprue opening of the lnold when the ladle is raised. The springs 38 possess sufficient strength to hold the nozzle 5 snugly to its seat during the injection of the metal into the mold and also provide cushioning means for preventing injury to the ladle or the parts associated therewith.

The box cams 22 also receive rollers 41 at opposite sides of a toggle operating lever 42 which is pivotally mounted at its forward end at 43, in arbracket 44 depending from table l. This lever extends rearwardly of the machine between and beyond the'cam drum and is connected, adjacent its rearward end, by a link 45 to the toggle construction 46. By'reference to Fig. 6it will be noted that the link '45 is formed of two members 47 bolted together and held in spaced rela tion by suitable spacers, the lower ends of these members being disposed at opposite sides of the rear end of the lever 42. At their upper ends the members 47 are bent outwardly to lit between a pair of inner tog gle links 48 pivotally secured at their lower ends by a pivot rod 49 to bracket uprights 50 secured to the rear end of table 1. links 51 similar to the links 48 are also secured to the upright 50 by pivot rod '49, the bracket uprights serving as spacers for the lower ends of each pair of links 48 and 5l. The upper or forward ends of each link 48 and 51 is disposed at opposite sides of a lug 52 projecting from the rearward end of a spacing block 53 secured between the rearward ends of a pair of forward toggle links 54. A similar block 55 is secured between theforward ends of the links 54 and receives threaded rods 56 .slidable therethrough, adjusting nuts 57 being threaded on these rods at the opposite ends of the block 55. The forward pairs of toggle links are hingedly secured to the rearward pair of toggle links by the pintle rod 58 secured through the forward ends of the links 48 and 51 and extending through the lugs 52.

Each of the rods 56 is provided, at its forward end, with a clevis in the form of an eye which extends into a slot 59 provided in a bracing web 60 adjacent each side of a carriage 61l slidably mounted on bed or table 1 (Fig. 7 A pintle rod 63 passes through the eyes or shackles 58 of the rod 56 estab-- lishing hinged connection between these rods and the carriage. The blocks'and the adjusting nuts on the rods provide. convenient means for adjusting the effective length of the toggle and, consequently, regulating the travel thereof to suit conditions.

As will be noted more clearly from Figs.

1 and 3, the connection between the upper end of the toggle operating link 45 and the toggle 46 formed b v the links 54 and 51 is in advance of the hinge of the toggle, the link plate or members 47 being pivotally secured at their upper ends to the inner forward links 54 of the toggle by pins 64.

The carriage 61 is provided at its forward end with a rectangular plate 65 upon which is bolted or otherwise suitably secured thev Outer operating relation to mold section 6, at which time the toggle is on dead center, as illustrated 1n Fig. 3, to lock mold section 7 in operative position, mold section 6 being held rigidly in position by being bolted to the inner face of a heavy bracket plate 66 disposed transversely of table 1 adjacent the forward end thereof and ixedly secured to the table. When the mold has been closed and the cores have been moved into operative position relative to the mold, when cores are used, the ladle 4 is raised into operative position and air under pressure is admitted into the upper end of this ladle injecting the molten metal into the mold. The mold then remains closed for a short time, sufficient to permit the metal to set,

ythe cores, if used, being then drawn and the stripping plate 67 is secured upon the forward vend of a supporting and guide shaft 68 slidably mounted in short sleeve 69 at the upper ends of the'arms of a supporting and guide frame 70 of substantially elongated U-shape which is secured to the upper face` of the adjacent portion of carriage 61. Stripping pins 71 are threaded through pla-te 67 and are secured in adjustment therein by jam nuts 7 2. These plates operate through aligned openings through plate 65 of the carriage and movable section 7 of the die. A block 73 is suitably secured on the supporting and guide shaft 68, as by clamping. This block is connected by a pair of links 74 to the angle of an angle lever 75 rockably mounted on the pintle rod 63. The lower portion of this lever is bifurcated providing two arms 76 of substantially rectangular shape by means of which the lever is mounted upon the pintle rod 63, the space between these arms accomodating the shaft 68. The links 74 are pivotally secured at 77 to the upper ends of the arms 76, these links being disposed adjacent the inner faces of the arms. Each of the arms 76 is also provided, adjacent its lower end, with a suitable opening 78 by means of which the links 74 can be attached to the arms of the lever at the lower end thereof. Upper arm 75 of the lever extends lforwardly therefrom and is connected by a link 80 to a block 81 slidably mounted on a guide rod 82 supported over the carriage centrally thereof and disposed longitudinally abovel the table 1. The forward end of this rod is secured through. a

cross member 83, the end port-ions of which rights A50. This cap member is provided f with the rear pair of nuts 88.

with a central boss 86 through which the rearward end of the rod 82 is secured. The

rods -84 also pass through eyes provided at i movement of the block 81 in either directionl upon the rod 82. With the carriage 61 in its forward position and the die mold closed, as illustrated in Fig. 3, the block Slis in con# tact with the forward pair of nuts 88 and the lever 75 has been swung into its rearward position retracting the pins 71 and moving them into inoperative position, as illustrated. With the parts in this position the plate 67 is in its rearmost position relative to the plate 65 and the link 7 4 is preferably on dead center so as to lock the plate 67 against rearward movement, though this is not essential.

. Upon opening of the die, the carriage 61 is moved rearwardly of the machine into the position. illustrated in Fig. 2. During this movement of the carriage, the plate 67 moves with the carriage until the block 81 contacts This prevents further rearward movement of the plate 67 and upon continued rearward movement of the carriage, lever is rocked about the pintle rod 63 so as to ,exert a leverage etl'e'ct acting through the links 74 which forces the plate 67 toward mold section 7, projecting the stripping pins through the mold openings so as to strip the work therefrom. In this connection it is to be noted that the work or article cast will adhere to the section 7 of'the mold, rather than to the section 6, due to'a small portion of the molten metal enteringabout the inner ends of the stripping pins during the casting opera'-A Particular' attention is called to the tion. fact that the connection between the plate 67 and the lever 75 is a. toggle connection. This is'important as the metal of the`cast article is comparatively soft at the time of stripping thereof from the mold section and a sudden blow would be apt to cause a fracture which would not heal as the metal takes its final set, thus rendering the article worthless. The provision of the toggle connection avoids this objection as it ensures that the initiation of ejecting operation takes place relatively slowly. The stripping pins exert, at first, a relatively slow pushing effect which serves to loosen the article from the mold section without subjecting it to a sharp blow. As the opening movement of the mold section continues the relative movement of the stripping pins is accelerated, quickly stripping the work from the mold. Upon forward movement of the carriage to return `the die section 7 to closed or o erative )osition, the plate 67 will travel with the earriage until block 81 contacts with the forward pair of nuts 88. This will stop the forward travel of the plate, after which the lever 75 will exert a leverage effect through the links 74 which will cause the plate 67 to be moved rearwardly away from plate 65, thus retracting the pin, as illustrated in Fig. 3. In either case quickoperation is obtained since the plates 65 and 67 are caused to move oppositely, the movement of the plate 67 being relatively fast due to the connections between lever 75 and the supporting and guide sha-ft 68. This is particularly desirable in stripping the work from the mold and is also of some assistance in speeding up production.

It is desirable, at times, to substitute a core for the stripping pins as, for instance, when casting cylindrical shells. In Fig. 13 I have shown a mold section 7 a mounted on plate 65 of carriage 61. This section has an opening receivin a cylindrical core 350, and .a recess surroun ing the core for reception .of metal to form a cylindrical casting 351.

This core is connected by a link 352 to the forward ends ofl arms of lever 75. The plate 65 of the carriage is provided with a suitable opening 65l to'accommodate the core. lith the core connected to the lever in this manner, when the mold section 7 a is moved forwardly into operative position, contact of block 81 with the forward pair of nuts 88 serves to project the core 350 into the mold and, upon opening of the mold, contact of block 81 with the rearward pair of nuts 88 serves to pull the core member out of the mold section 7a. In this manner the lever 75 and associated parts can be quickly and easily adapted'for operating a core member, when circumstances require.V

To facilitate rearward movement of the carriage 6l I provide a counterweight 90 to which is secured achain 91 passing over a pulley 92 mounted in a bracket 93 secured to the rear end of table 1. The forward end of this chain is secured to a securing strip 94 which, in turn, is secured to the plate or base portion of the elongated U-shaped frame 70.

Each of the box cams 23 receives a roller 95 mounted at the inner end of a pair4 of links 96 and 97, the inner ends of which are pvotally secured together by -a suitable pin upon which the roller is mounted. The u per end of link 96 is pivoted at 98 in a bracket 99 depending from table 1. The outer end ,of link 97 is pvotally secured at 100 to the lower end of an arm 101 which is secured on the rearward end of a rock shaft 102 mounted in suitable bearing members on the main frame of the machine. An arm 103 is seeuredon the forward end of each shaft 102. As will be noted more clearly from Fig. 9, this arm is slotted longitudinally to receive a block 104 of dovetail cross section. This block is provided with a central bore and is interiorly threaded for cooperation with. an adjusting screw 105 confined in a recess 106 in arm 103. This provides simple and efficient means for adjusting the block longitudinally ,of the warm. This block is provided, on its outer face with a pin by means of which the eye 107 of a connecting rod 108 is pvotally secured to the arm. By adjusting the block 104 the eccentric connection between the shaft and the rod 108 can be varied to suit circumstances. Rod 108 passes through a sleeve 109 pvotally secured at 110 to an operating lever 111 pivoted at its lower end, at 112, in bearing locks 113 secured to the base portion of thev main frame. The upper end of lever 111 is connected by pin and slot connections 114 to the outer end of a supporting and guide rod 115 which is slidably mounted for horizontal reciprocation in a cylindrical enlargement 116 of the bracket plate 66. A

core supporting and Aoperating arm 117 is mounted on each rod 115 and is locked in adjustment thereon by a jam nut 118. This arm extends rearwardly of the machine bevond the bracket plate 66 and is slotted longitudinally for reception of a core supporting rod 119, which is adjustably secured in the slot 120 by nuts 121 threaded on the rod at opposite sides of arm 117. The rod 119 carries at its inner end a suitable core 122 for cooperation with the die mold it being understood that the particular size and shape of the core, as well as the construction thereof, may be varied within wide limits to suit the particular type of work being done. VThe rods 115 are held against turning movement in any suitable manner, as by being splined in the enlargement 116. It will also be noted that the outer ends of these rodsA are provided with diametrical slots which snugly receive the upper end portions of the levers 111 which serve to efectually prevent turning movement of these rods. In Fig. 14 I have illustrated rod 115 as hav ing an outer reduced portion 115l onto which the nut 118 is threaded. 'This reduced portion is connected to the body portion of the rodby a tapered or frusto-conical element 115b which tits into a corresponding recess in arm 117. By loosening the nut 118 the arm is released and can be readily turned about the shaft into any desired position, after which it is very effectively secured in adjustment by turnlng the nut onto the shaft so as to force the arm into locking contact with element 115". The manner of mounting the arms 117 upon the supporting and guide rods therefor,combined with the manner of mounting the core rods on the arms, permits ready adjustment of the cores to insure proper relation thereof to the dies.

The bracket plate 66 is provided with a central vertical enlargement 123V extending from the central portion of the cylindrical enlargement 116 and'forming therewith a T-shapedstructure. The enlargement 123 slidably receives a supporting and guide rod 124 similar to the rod 115. A third core supporting arm .117 is secured on the upper end of rod 124 and receives a core supporting rod 119 adjust-ably secured in position by means of nuts 121 disposed at opposite sides or faces of the arm 117. The rod 124 is provided, adjacent its lower end, with a diametrical slot 125 -which receives a rounded head 126 at the inner end of an operating lever 127 which is loosely connected at its outer end, at 128, toa bracket extension 129 of the bracket plate 66. The head 126 is pvotally secured to rod 124 by a suitable pin 130 passing through the rod andthe head and the enlargement 123 is provided withl a slot extending to within a short distance of the lower'end thereof to accommodate vertical movement of the lever 127. The connection between the outer end of this lever and extension 129 is sufficiently loose to permit a certain amount of lengthwise movement of the lever 127 to accommodate reciprocation of the. inner end thereof. This connection-is preferably a pin and slot connection, though a loose connection of other type may be employed. The lever 127 is connected, adjacent its inner end, to a block 104 adjustably mounted in arm 103,

this block being adjusted by screw 105. A.

block isl provided with a pin 106 'which passes through the eye 107 of a connecting rod 108 adjustably secured through sleeve 109 by mea-ns of nuts threaded on the rod at opposite ends of the sleeve, this sleeve being pvotally secured to the lever 127 at 110. It will be noted that the connections between the lever 127 and its operating arm are similar to the connections between the lever 111 and its operating arm. The arm 103 for operating the lever 127 is secured on the forward end of a counter shaft 130 rockably mounted at the right hand side of the machine in a bearing sleeve 131 formed at the upper endof upright 88, the forward end of this shaft being mounted in a boss 132 of bracket plate 66. A collar 133 secured on the shaft adjacent boss 132 prevents endwise movement of the shaft toward the right hand end of the machine. This` arm 136 may be formed integrally with arm 101 or may be formed separately therefrom, as circumstances may require. In theform illustrated, the two arms are shown as being integrally united by a common hub which is secured upon the shaft. n

During rotation of the cam drums, the box cams 23 thereof act to operate the levers 111 and 127 and, together with the associated shafts and arms, exert a powerful leverage effect which serves to very effectually pull the cores from the die mold. In the form of die mold illustrated, and the cores therefor, the upper or top core is considered as the main core and the connections between the core pulling levers and operating arms therefor are so adjusted that this top core is pulled.v first, the side cores acting to anchor the work in the mold until the main core is pulled, after which the side cores are pulled and the mold is then opened,

the movable section being moved rearwardlyv of the machine with the carriage in the manner described. In this connection, the independently adjustable connections between the respective core operating levers and the operating shaft therefor are of value as permitting adjustment of the core operating means independently to obtain desired timing of the cores.

Each of the car'n drums is provided with a head 137 securedv in the outer end thereof, this head being provided with an eccentric 138. A shield operating lever 139 is pivoted at its forward end at 140 on a bracket 141 depending from a brace bar 142 connecting .two of the uprights of the main frame, this bar alsohaving a vertical arm 143 which carries the bearing block or sleeve 20 for shaft 19, the upper end of this vertical arm 143 being bolted to table 1. The lever 139 is of flattened V-shape and a roller 144 is mounted at the angle of this lever and bears against the periphery of the eccentric 138."1The rearwardend of the lever is pivotally secured at 145 to the lower end of a clevis 146 from which extends an operating rod 147.- As will be more clearly noted from Fig. 4, this rod is provided at its upper end with a clevis 148 secured thereon, this clevis by links 186 the upper ends of which are pivoted tothe levers, the lower ends of these links being pivoted to arms 187 projecting upwardly from the shields. Each of the shields is slidably mounted, by means of associated brackets for vertical movement on guide rods 188 secured tothe table 1. As indicated in Fig. 1, the shields are shaped to fit about and enclose a mold and the cores and the operating mechanisms therefor at the sides of the machine, these shields cooperating with the bracket plate 66 and the carriage 61 to so enclose the mold as to eliminate possibility of the molten metal being sprayed outwardly 'beyond the table in the event of a defective mold or core, or in t-he event that the air should be admitted to the mold before complete closing thereof due to a defective mold or an object becoming positioned between the mold sections. The eccentrics 138 for operating the levers 139 are so disposed that the shields are lowered into full operative position in contact with the upper face of table 1 as the movable die section approaches full closed position, and remain in this lowered operative position until after the metal has been injected into the mold and the air valve has been closed and the air exhausted from the ladle which is returned to inoperative position before the shield members are raised. y This serves to efectually protect the operator and aliy bystanders from injury due to molten metal being sprayed out of or beyond the mold.

Referring more particularly to Figs. 2, 4 and 6, lever 150 at the right hand side of the machine (upper left hand side of Fig. 4) is connected, to the rear of clevis 148, to the upper end of a link 189 the lower end of which is pivotally secured to the forward end of an arm 190 secured on a rock shaft 191 which is rockably mounted through the bracket uprights 50 and through bearing brackets 192 secured to table 1. A forwardly directed arm 193 is secured to the other end of shaft 191 and is connected by link 194 to the inner one of two strips or plates 195 and 196 of elongated rectangular shape which are slidably mounted for vertical movement in guide structures 197 and 198 secured to the main frame and to a bracket 199, respectively, the bracket being of approximately L-shape and secured to the bracket uprights 50. The outer plate 196 is connected by a link 200 (Fig. 1) to the rearward end of lever 150 at the left hand side of the machine. The two plates 195 and196 are thus connected to the shields so as to be raised when the shields are lowered and vice versa. As these plates are movable independently .of each other, this permits raising of either of the shields independently of the other, when the shields arein lowered operative position, so as to permit ready access to the die mold and associated parts from either side of the machine. Tliisfeature is, at times, practical utility. e

As` will be noted more clearly from Figs. 3 and 11, each of the plates or bars 195 and 196 is provided in its forward end with a cut-out or recess 201 of arcuate shape adapted for reception of a roller 202 mounted between a pair of strips forming a link 203 the rearward end of which is connected by a second link 204 to the bracket 199. The forward end of links 203 is pivoted to the upper end of a lever 205 which is pivoted at 206 on a bracket secured to the main frame. A roller` 207 is mounted on the outer face of this lever at the lower end thereof and contacts with the periphery of a cam discl 208 secured on the outer end of shaft 19. This disc is provided with a recess 209 disposed to permit `forward movement of the lower end of the lever toward the shaft 19, and the lower end of the lever is urged toward the disc 208 by a plunger 210 whichcontacts with thevv lever adjacent the roller 207 and is urged toward the lever by -an expansion spring 211 mounted about the plunger and 'confined between a collar 212 secured thereon and adjusting screw 213 which is bored out and slidably receives the rearward portion 'of the plunger. This screw is threaded through the outer arm of an4 L-shaped bracket 214 secured to the frame and the forward portion of the plunger is slidable through a bracket projecting from the frame. The disc 208 serves to normally hold the lever 205 in the position illustrated in Fig. 2 during the greater portion ofthe rotation of the cam drum. When' the cut-out or recess 209 is brought into alignment with roller 207, in the normal operation of the machine, the roller enters this recess swinging the upper end of the lever rearwardly and causing the roller 202 to enter the recesses 201 of the plates or bars 195and 196, this operation occuring when the shields are in lowered operative position raising the plates into such position as to permit entry of the roller 202 into the recesses 201. It is to be noted that, when the shields are not in full lowered position, the roller 202'con tacts with the forward edges. of the plates 195 and-196 and these plates serve to prevent4 rearward movement ofthe upper portion of lever 205 even though the recess 209 is brought into alignment fvwith the roller 207.

The valve control lever 205 is connected, below its pivot 206, to the lower end of a `valve operating lever 215, by means of a pull rod 216; The lever 215 is pivotally mounted at 217 upon` a bracket 218 secured to the table 1. The upper end of lever 215 is connected, by means of a clevis 219, to the operating rod or stem of a4 valve indicated generally by 220. This valve includes of great a suitable casing within .which is slidably mounted a valve proper of the D type the stem of which is connected to the lever 215 to be shifted thereby into operative and inoperative positions. Compressed air under a pressure of approximately 350 pounds per sq. inch is supplied to the casing of the valve by means of a pipe 221 opening through the top ofthe casing, and this casing is rovided with a suitable outlet or exhaust el ow 222. For supplying air from the valve structure to the upper portion of the ladle a suitable connection is provided including a nipple 223 to which is connected an elbow 224 by a suitable coupling 225 permitting relative turning movement of the elbow. A short pipe 226 is secured to the elbow and slidably receives a length of pipe 227 connected by an elbow 228.to a short pipe 229 which is secured to the frame 8 for supporting thev ladle, this latter pipe 229 being threaded into. anopening adjacent the upper end of the ladle, this Vopening being disposed closely adjacent the. lower end of a closure plug 230 threaded into the upper end of the'ladle. tion between the air control valve structure and the ladlel for supplying air to the ladle above the molten'metal therein and under pressure at suitable times in the operation of the machine. The particular construction of the valve. employed and the arrangement of the air inlet andexhaust ports is disclosed in my Patent 1,322,501 of November 18, 1919 and need not be illustratedl or described in detail here. The valve mechanism is so arranged that, when the lower end of the control lever 205 is moved forwardl and the roller 207 enters the recess 209 o cam disc 208, the valve is opened to admit air into the ladle injecting the molten metal into the mold. This opening of the valve takes place after the mold has been closed and the ladle has been raised into operative position, the shields being also in full lowered operative position. Upon continued rotation of disc 208 the recessed portion thereof is moved out of alignment with roller 207 and the lever 205 is rocked about its axis moving the pulll rod 216 rearwardly and shifting the valve into inoperative or open position permitting the air in the upper portion of the ladle to discharge through the elbow 222.- VThe shields are then lifted, ,the cores are pulled, and the mold is opened so as to strip or remove the work therefrom.

As previously pointed out, when the bars or plates 195 and 196 are ,in lowered position the recesses 201 thereof are below and out of alignment with the roller 202 so that the lever` 205 cannot be rocked in proper direction to open the air valve. In conjunction with these plates I provide a safety device for holding the shields raised and for preventing opening of the air control valve This provides a suitable connecsleeve 232 carried by the upright 87, the

other end of this rod being mounted through a lug 233 projecting from the guide member 198. An operating handle 234 provided with a fork 234a which straddles rod 231, is pivotally securedto the rod by a pin 234b, this handle normally resting in a recess 235 in an extended portion of the sleeve 232. An arm 236 is secured to the other end of the ro'd and is provided with a locking finger 237 disposed to engage through alined openings 238 in the plates 195 and 196 when these plates are lowered and the handle 234' is moved out of recess 235 and swung into position .beyond the rearward end of sleeve 232 to permit turning of the shaft and lowering of arm 236 into operative position. When the arm 236 is lowered the finger 237 locks the plate in lowered position so as to hold the shields in raisedl or inoperative position and these plates cooperate vwith the roller 202 to prevent opening of the aircontrol valve. This provides a very simple and highly efficient safety means which permits opera'tion -ofthe mold and associated parts without injecting metal into the mold. By thismeans I assure that no metal will be injected into the mold except when the shields are in lowered operative position. This feature is of great importance as provtecting'the operator against injury by molten metal in the event of defects in the mold or the cores, as previously pointed out, and is also of importance as permitting operation of the mold to obtain accurate adjustment A drive shaft 239is mounted in suitable bearing members adjacent the back of tablev l and transversely thereof. This shaft has a sprocket 24() (Fig. 3) keyed thereon which is connected by a sprocket chain 241 to a sprocket gear ringI .which is secured to the left hand drum 21 as considered in Figs. 6 and 7. `A suitable tightening device 242 (Fig. is'provided for maintaining the chain under proper tension. A pulley 243 is keyed on the outer end of shaft 239 and .is driven by a belt244 which passes about a pulley 245 keyedon a pulley shaft 246 supported by suitably disposed hangers 247. Two other pulleys 248 and 249 are mounted loose on shaft 246 and are driven oppositely,

as indicated by the arrows in Fig.8, from pulleys on a line shaft not shown). Either of these pulleys, selectively, can be operatively connected to shaft 246 through the medium of a suitable clutch 249 'splined on the shaft and operated by a shift lever 250 having a fork for shifting the clutch, the rod portion of this lever being rockably mounted in a suitablebearing at its upper end and in a bracket 251, at its lower end,

this bracket being secured to one of the hangers 247. An arm 252 is secured on rod 250 and is connected by a rod 253 to an arm 254 which is secured on a rod 255 extending Aupwardly from the machine.` By shifting the clutch 249 pulley 243 may be driven in either direction or operation of the machine may be stopped by shifting the clutch into neutral lor central position. Normally the pulley 243 is driven by pulley 248 so as to be rotated in a vclockwise direction during operation of the machine. employed for reversing the direction of -rotation of pulley 243 only in emergencies as, for instance, when it is desired to open the die mold after artially closing the same and without comp etely closing the mold.

For controlling the operation of the machine I provide a main control lever 256 whichis secured 0n a rod 257 rockably supported in suitable bearings transversely of the machine, the left hand portion of this rod extending through a sleeve bracket 258 secured to the main frame of the machine. The mounting of this lever and associated parts will be better understood by referring to Figs. 1, 2, 4 and 6 of the drawings. The control lever is provided with a detent 259 which cooperates with a sector or rack 260 secured to the outer end of sleeve bracket 258, in a known manner, for holding the lever in adjustment. A cam plate 261 is secured to Pulley 249 is an arm 262 which is loosely mounted on shaft 257, this cam plate bein disposed closely adjacent the outer face o lever 256.

The detent 261 is of sufficient width to contact with the upper edges of the cam plate and the rack. The rack is provided with three notches, a, central notch and one adjacent each end thereof, and the cam plate is .provided with recesses receiving the detent 259 when the operating lever is in either neutral or operating position, these recesses having cam surfaces for raising the detent and releasing the lever.

Arm 262 is connected by a link 263 to anl arm 264 secured on the outer end of a stub shaft 265 rockably mounted in a sleeve bearing 266 secured to the main frame of the machine. An arm 268 is secured on the inner end of this stub shaft and has its upper 'end connected by a tension spring 269 to arm 143 of the frame member 142. Arm 268 is further provided, at its lower end with an arm 269 of approximately L-shape, at the'lower end of which is mounted a roller 27() which projects into the adjacent head 137 of the drum and is disposed for contact. with a cam member 271 secured to the peripheral flange of this head. When the casting operation is complete and the movable mold section 7 has been moved into full open position, cam member 271 contacts with roller 270 so as to swing the cam plate 261 1n a clockwise dlrectlon, as considered ing or slot of thc rack 260. When the drum' is again rotated roller 270 passes out of contact with the cam member, or, more correctly stated, the cam member passes out of contact with the roller, permitting movement of arm 268 in a counter clockwise-direction under the influence of spring 269, this movement of the arm being limited by a stop pin 272. The construction o f the rack plate and cam plate is disclosed in my Patent 1,322,501 issued November 18 191.9, andl need not be more fully illustrated or described in detail here. p

Referring more particularly to Figs. 1 and 4, an arm 273 is secured on the other end of rod 257 and is connected by link 274 to one arm of a bell crank lever 275 pivotally mounted at276 on one of the uprights o-f the main frame. The other arm of this lever is yconnected by a link 277 to the upper end of a plate 278 rockably mounted at its lower end at 279 on a bracket 280 secured to table 1. The rearward end of link 27 7 is disposed between the plate and an arm 281 which is secured to the plate (Fig. 1); The inner end of this arm is connected by a rod 282 to an arm 283 which is secured on the shift rod 255, which passes through a guide member 284 secured on one of the brace rods 84.

A Y-member 285 is secured on plate 278 with the arms of its head disposed in angular relation to form a flat V-shape, these arms forming camelements 286 which are oppositely disposed. A suitable frame 287 is pivotally mounted at its rearward end at 288 on a bracket 289 extending from the table.

This frame carries at its upper portion a brake shoe 290 disposed to contact with the upper portion of pulley 243 when the frame is lowered. A tension spring 291 connects the frame, adjacent the forward end thereof, to the frame of the machine and acts to hold brake shoe 290 tightly against the pulleyl ation of the machine. This alsoipermits downward movement of the brake shoe frame. by the spring 291 so as to apply the brake to the pulley 243 preventing turning thereof. When the control lever is rocked rearwardly of the machine'into operative position, the plate 278 and consequently the Y member -285 are swung in a counter clockwise direction as considered in Fig. 4 shifting the clutch 249a into position to establish driving connection between the pulley 248 and shaft 246. At the same time, the right hand arm 292, as considered in Fig. 4 of the Y member acts to lift the roller 292 raising the brake shoe frame 287 and releasingl the pulley 243. At the end of the operation, when the main control lever is released so as to move from the position illustrated in Fig. 3 to that illustrated in Fig. 2, the pressure of the roller 292 upon the arm of the Y member acts to return the operating lever to neutral position through the shaft 257 and the connections between the shaft and the Y member. As previously explained, the control lever is moved into its forward reverse position only in emergency. For this reason the cam plate 262 preferably extends beyond the emergency slot in the rack so that the control lever can not be secured in emergencyposition and, if desired, the emergency slot in the rack plate may be omitted. In my Patent 1,322,501 I have shown an arrangement of control and shifting mechanisms very similar in their broader aspects to the mechanism herein illustrated and described, though I have found that the mechanisms of the present application are more satisfactory inl operation than the mechanisms of my patent referred to.

It is thought that the operation of my machine will be readily understood from the above description, though a brief rsum may be desirable. In operation, assuming that the die mold is open and t-he parts are in the positions illustrated in Fig. 2, the shields being raised as in Fig. 4; upon rotation of the cam drum the die `mold is closed, the shields are lowered into full operative position, the ladle is then raised so as j to position the nozzle 5 tightly in the sprue opening of the mold, and the roller 207 then enters recess 209 of disc 208 permitting movement'of lever 205 in .proper direction to admit air into the upper portion of the ladle above the molten metal, thus injecting the metal into the mold.v The recess' 209 is preferably of sufficient length to insure that the metal in the ladle will be subjected to air pressure for a sufficient time to asraised, the cores are pulled, and the mold is opened, the work being stripped from the mold section 7 as it approaches the limit of its rearward movement. At this time the control lever 256 is released and returned to central or inoperative position. It may be desirable at times, particularly when working on large pieces, to retain the air valve for admitting air pressure to the ladle open for a greater length of time than would be possible by permitting the continuous rotation of the drum. This result can b e readily accomplished by throwing the control lever 256 into central or neutral position as the roller 207 enters recess 209. As long as the lever is maintained in this position the molten metal in the ladle 4 will be subjected to air' pressure. In this connection it is particularly pointed out that the provision of the brake shoe and associated parts is advantageous in that the brake is applied to the pulley as soon as the lever is shifted into neutral position stopping rotation of the drums immediately and preventing opening of the air valve, when the roller 207.*.is in recess 209, until the lever has been returned to operative position.

The connections between the cores and the operating arms therefor are adjustable, as

previously pointed out.- In the mold illustrated in Fig. 2, the top core 122 is the main core and serves to close the upper end of the mold cavity, being provided with an annular flange at its upper end for this purpose. The connection for the operating arm for this main core is adjusted so that this core is pulled first, the other cores acting 'to anchor the Work in the mold during pulling of the main core. After the main core has been pulled, the other cores are pulled and the mold is then opened. The adju`stable connection between the respective cores and the operating arms therefore permits the adjustment of the cores so as to vary the timed relation thereof, permitting the cores to be pulled simultaneously or successively in any desired order as circumstances may requ1re. v

In Fig. 12 I have illustrated semi-diagrammatically modified means for operating the carriage toggle. This lever 293 consists of a forward straight portion pivoted at 43, the rearward end portion of which is bent substantially at right angles to provide an upwardly extending arm 294. Arm 294 is connected by a link 295 to the rearward link of toggle 46. During upward movement of the lever 293 the link 295 moves upwardly and rearwardly, the horizontal component of the movement of the link exerting a pulling effect on the forward link of the toggle 46 so as to assistv in the rearward movement of the carriage and associated parts. Durin downward movement 0f the link 295 this horizontal component exerts a pushing effect 46 to produce a double toggle structure which is highly, efficient as giving ample travel of the carr'iage and sufficient force to pull the carriage and the movable die section back. This double toggle renders it possible to use smaller cam drums than is possible where the means for operating the carriage shown in Figs. 2 and 3 is employed,

and to effect a corresponding reduction in size and weight of the associated parts of the machine. The form of carriage operating means shown in Fig. 12 is, therefore, to be considered as the'preferred form.

The uprights or legs 2 ,u on which the forward ends of the rock-sha ts 102 are journalel andpboxes 113, are subjected to severe strains during pulling of the cores and it is necessary for this reason, to properly brace these members. Side sills 300 are bolted to the lower ends of the legs supporting the table 1. These sills are connected by a crossbar 301 which extends beneath the sills and is bolted or otherwise suitably secured thereto. The-end portions of bar 301 extend beyond the sills and form, in effect, bed plates upon which the boxes seat, these boxes being bolt-ed to the ends of the bar. 'Ihe front legs 2 are connected by a cross-bar 302 and the back legs are connected by a cross-bar 303. This produces, in effect, a box structure the interior of which is unobstrueted to accommodate the drums and associated iarts. The shafts 102 are disposed closely adjacent the upper ends of the legs 2 and thedistance between the lower end of each of these legs and the corresponding member 113 is very short. During pulling of the core, the inward pressure exerted on the sill at the lower end of the leg is largely counteracted by the outward pressure exerted by lever 111. The cross-bar 301 acts as a tension member to resist the outward pressures of levers 111 and the short lengths of sills connecting members 113 and the lower ends of the next to the front legs 2 have ample strength to resist the inward pressures exerted by the legs. The table and the legs are thus combined with the sills to produce a structure well adapted to receive and support the various parts of the machine and which possesses ample strength to resist the severe strains to which these parts are necessarily subjected in use.

I have found, that when the form of lever illustrated in Fig. 12 is used, with the link associated therewith in the manner illustrated, it is not necessary to employ a counterweight or equivalent means to obtain ease of operation of the carriage. In fact, the employment of the counterweight is not essential in either form of construction, but I find that it is advantageous in the form illustrated in Figs. 1 to 7 as facilitating ease and smoothness of operation of carriage.

What I claim is 1. In a die casting machine, a die mold including a movable section, means for operating said mold section, a plate mounted for movement with the mold section, link mechanism actuated by the movement of the mold section for moving the plate with respect to the mold section, stripping pins carried by the plate and slidable through the mold section, and stop means limiting the movement of the plate with the mold section in either direction for retracting and projecting the pins.

2. In a die casting machine, a die mold including a movable section, means for operating said mold section, a plate mounted for movement with the mold section, link mechanism actuated by the movement of the mold section for moving the plate with respect to the mold section, strip ing pins carried by the plate and slidable t rough the mold section, and stop means limiting the movement of the plate with the mold section'in either direction for retracting and projecting the pins, said stop means being adjustable to vary the extent of travel of the plate with the mold section.

3. In a die casting machine, a die mold including a movable section, means for operating said mold section, a plate mounted for movement with the mold section, th plate and the mold section having relative movement, stripping pins carried by the plate and slidable through the mold section, stop means limiting movement of the plate with the mold section in either direction for retracting and projecting the pins, and lever means cooperating with the stop means for moving the plate oppositely to the mold section when said plate reaches the limit of its travel in either direction with the mold section and during the remaining travel of said mold section. t Y y 4. In a die cast-ing machine, a reciprocating carriage, a die mold section mounted on the carriage for travel therewith, a plate slidably mounted on the carriage for relative movement, pins carried by the plate and operating through the mold section and the adjacent portion of the carriage, a rod, a sleeve slidable on the rod, a lever on the carriage, a link connecting the lever and the sleeve, stops on the rod limiting travel of the sleeve in either direction, operating connections between the lever and the plate, vand means for operating said carriage.

5. In a die casting machine, a reciprocating carriage, a die mold section mounted on the carriage for travel therewith, a plate v plate, a link connection between the lever above its ulcrum and said rod, and means for operating said carria e. i 0

6. In a die casting mac ine, a reciprocating carriage, a die mold including a section mounted on the carriage for travel therewith, core members cooperating with the die mold, a cam drum, a toggle for operating the carriage, a plate mounted on the carriage for travel therewith, the plate and the carriage having relative movement, means limiting movement of the plate with the carriage in either direction, pins carried by the plate and operating through said mold section and the adjacent portion of the carriage, and operating connections between the cam drum and the carriage and both the core members for operating said carriage and ,said core members in synchronism.

7. In a die casting machine, a reciprocating carriage, a die mold including a section mounted on the carriage :tor` travel therewith, core members cooperating with the die mold, a cam drum, a toggle for operating the carriage, a plate mounted on the carriage for travel therewith, the plate and the carriage having relative movement, means limiting movement of the plate with the earriage in either direction, pins carried b the plate and operating through said mol section and the adjacent ortion of the carriage, and lever operating connections between the cam drum-and both the carriage and the core members for operating said carriage and said core'members in synchronism.

8. In a die casting machine, a main bracket at the forward portion vof the machine,

a die mold section on said bracket, a reciproeating carnage, a second `mold section mounted on the carriage and movable therewith into and out of operative relation to the first moldsection, supporting and guide rods slidably mounted on', the bracket for movement laterally thereof,'arms secured on said rods, cores carried by the arms and cooperating with the mold laterally thereof, operating levers fulcrumed on axes disposed longitudinall of the machine and having loose connectlon with said rods, a cam drum adjacent the rear of the machine, operating connections between the drum and the carriage and o erating connections between the drum and t e levers for operating the cores in synehronism with the operation of the carriage. v

9. In a die casting machine, a main bracket at the forward portion of the machine, a' ldie mold section on said bracket, a reciproeating carriage, a second mold section ,mounted on the carriage and movable therewith into and out of operative relation to the rst mold section, supporting and guide rods slidably mounted on the bracket for movement laterally thereof, arms secured on said rods, cores carried by the arms and cooperating with the mold laterally thereof, op-

erating levers fulcrumed on axes disposed longitudinally of the machine and having loose connection with said rods, a cam drum adjacent the rear of the machine, operating connections between the drum and the earriage, and operating connections between the drinn and the levers for operating the cores in synchronism with the opera-tion of the carriage, the connections between the drum and the res eetive levers being independently adj ustab e to vary the relative timing between the respective cores. i

10. Inla die casting machine, a main brack- V etat the forward portion of the machine, a

die mold section on said bracket, a reciproeating carriage, a second mold section mounted on the carriage and movable therewith into and out of operative relation to the first mold section, supporting and 'guide rods slidably -mounted on the bracket for movement laterallythereof, arms secured on said j rods, cores carried by the arms and cooperating with the mold laterally thereof, o rating levers fulcrumed on axes dispose longitudinally of the machine and having loose connection with said rods, a cam drum adjacent the rear of the machine, operating conl nections between the drum and the carriage,

containing molten metal, a die mold, a.y ladle operating in the tank,said ladle being closed at one end and havinga nozzle at its other end adapted for engagement with the sprue opening of the die, an air pressure supply pipe connected to the ladle adjacent the closed end thereof, valve means controlling the admission and exhaust of air to and from the ladle, shields movable into and out of position to. enclose `the die, and positive connecting means for moving the shields into and out of operative position, said means operating in the tank, said ladle being closed at one end and having a nozzle at its other end adapted for engagement into the sp1-ue opening of the die, an air pressure supply pipe connected to the ladle adjacent the `closed end thereof, valve means controllinnr the admission and exhaust of air to and from the ladle, shields movable into and out of position to enclose the die mold, means for moving the ladle into operative position, positive connecting means for moving the shields into and out of operative position, said means permitting movement of the shields independently into inoperative position when said shields are in operative position, and means cooperating with said shield operating means foroperating the air control valve in timed relation with the operation of the shields and the ladle, said cooperating means preventing opening of the air valve until the shields are in full operative position.

.13. In a die casting machine, a tank for containing molten metal, a die mold, a ladle operating in the tank, saidladle being closed at one end and having a nozzle at its other end adapted for engagement into the sprue opening of the die, an air pressure supply pipe connected to the ladle adjacent the closed end thereof, valve means controllinor the admission and exhaust of air to and from-the ladle, shields movable into and out of position to enclose the'die mold, operating means for the' respective shields, two slidably mounted members disposed closely adjacent each other and connected to the respective shields for movement therewith, means operating in synchronism with the ladle and the shields for operating the air pressure control valve, said valve operating means coacting with the slidable members for holdin the valve in inoperative position when the s ields are in inoperative position, and means for securing the slidable members against movement when the shields are in inoperative position.

14. In a die casting machine, a die mold, means for injecting vmolten metal into the mold, said means including an air pressure suppl pipe, a control valve in said pipe, shiel s mounted to be lowered and raised into and out of. position to enclose the mold, a cam drum, cams on the drum, levers connected to the respective shields and held by the weight thereof in contact with the cams for raising and lowering the shields upon rotation of the drum, means for operating the valve in synchronism with raising and lowering of the shields, control means movable with the shields and cooperating with

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