US1713312A - Die-casting machine - Google Patents

Description

May 14-, 1929. 'w. o. WILL ETA!- DIE CASTING MACHINE Filed Feb. 1; 1926 ll Sheets-Sheet 1 WZS May 14, 1929. w o L ET AL DIE CASTING MACHINE Filed Feb. 1, .1926 l1 Sheets-Sheet 2 y 1929. w. 0. WELL, ET AL 1,713,312

DIE CASTING MACHINE Filed 192.5 11 Sheets-Sheet 3 y 14, 1929- w. 0. Wm. ET AL 1,713,312

DIE CASTING MACHINE Filed Feb. 1, 1926 ll S.heetsSheet 4 I i i I i 0 6 17., g i n z l j 1 :1 4 X 1 Q 62 a I 91 61 .2g I & Z4

74 74 1-- U 2 20 i 1 If 0 l X0 (D in I /1 v 412 I y 4, 1929. w. o. WILL. ET AL 1,713,312

DIE CASTING MACHINE Filed Feb. 1, 1926 l Sheets-Sheet 6 May 14, 1929. v w. o. WILL ET AL 1,713,312

DIE CASTING MACHINE May 14, 1929. w w ET AL 1,713,312

DIE CASTING MACHINE Filed Feb. 1, 1926 11 SheetSTSheet 8 ugy' May 14, 1929 w. o. WILL'IETYAL 1,113,312

DIE CASTING MACHINE Filed Feb. 1, 1926 ll Sheets-Sheet l0 nnumnnmmnnnunuwu Zp Veg 2 -0145.

May 14, 1929. w, 0, w L ET AL DIE CASTING MACHINE Filed Feb. 1, 1926 ll Sheets-Sheet ll l Veg Zora. fiZZEr O ZZZ/Z Patented May 14, 1929.

UNITED STATES PATENT .FFICE.

WALTER O. WILL AND ERIC CARLSON, OF CHICAGO, ILLINOIS, ASSIGNOBS TO STEWART MANUFACTURING CORPORATION, OF CHICAGO, ILLINOIS, A CORPORATION OF DEL- AWARE.

DIE-CASTING MACHINE.

Application filed February 1, 1926. Serial No. 85,165.

The purpose of this invention is to provide an improved machine for die casting. It consists in the elements and features of construction shown and described as indicated in the claims. 4

In the drawings:

- Figure 1 is a front end elevation with the casing of a main power-transmitting wheel partly broken away.

Figure 2 is a left haiid side elevation partly sectional as to the melting pot and injector for delivering molten metal to the mold or die, and broken away as to an intermediate portion of the upright frame structure and part contained for condensing the view vertically.

Figure 3 is a side elevation for showing principally the upright frame structure and portion of the base structure underneath said upright "frame portions intermediate the latter and the front and rear ends respectively,

being brolren away to condense the view.

Figure 4 is a transverse vertical section at a plane about midway the length of the upper and lower die-niember-carrying and operating heads.

Figure 5 is a front end elevation on a larger scale than Figure 1, showing a main power-transmitting wheel with a driving shaft and clutch and starting and stopping devices. 1

Figure 6 is a partial or detail rear end elevation the upper part of the machine being broken away.

Figure 7 is a sectional detail View of a modified form of the melting pot metal injecter and operating connections, section being made in the plane of the metal injector throat.

Figure 8 is a section at the line 8-8 on Figure '2'.

Figure 9 is a section at the line 9-9 on Figure l.

Figure 10 is a section at the line 1010 on Figure 9.

Figure ii is a section at substantially the same plane as Figure 4 and in part at the planes of Figure 10, showing diagrammatically, that is, without identity as,to the plane of section, certain compressed air op-- erating devices for controlling certain of the movements of the mechanism.

Figure 12; is a detail section on a larger scale than Figure 5, axial with respect to the power shaft, fly wheel and pulley and clutch mechanism.

Figure 13 is a section at the line 13-13 on Figure 10.

Figure ll is a section at the line M--14 on Figure 5.

Figure 15 is a top plan View of so much of the structure as lies between the two lines l5-15 on Fig. 2.

Figure 16 is a horizontal section at the line ld-ltl on Figs. 2 and l.

Figural? is. a horizontal section and top plan view at the plane indicated by the line, l7-'17 on Fig. 2.

Figure 18 is a perspective view of a link in the connections for operating the upper reciprocating die-member-carryin head.

Figure 19 is a side elevation 0 two cams for operating symmetrically the transverse slide heads for carrying transversely thrust cores and the like.

Figure 20 is a detail section at 2ll20, on Fig. 1-.

Figure 2?. is a section at the line, 2l21, on Fig. 20.,

Figure 22 is an elevation of the valve device for ccntrolling compressed air tor injecting metal into the die. I

Figure is a section at the line, 23-23, on Figure 221 Figure 2a is an edge elevation of client several identically constructed valves operated at will for controlling compressed air for operating certain parts of the mechanism.

F igure 25 is a section at the line, 25-25, on Fig. 2a. 1

Figure 26 is a section at the line, 26-26, on Fig. 23.

the line,

The machine shown in the drawings com-' prises elements which will be hereinafter described in detail with respect to their operation and co-operation, but which will be first enumerated in general for afiording an outline understanding of the organization, as

follows:

1. A main base frame, A, in which there is journalled extending longitudinally thereof a main operating shaft hereinafter identified;

2. An upright frame structure, B, in which the top and bottom die-member-carrying heads, D and G, are mounted for-the movement of one of said heads for opening and closing the mold; said heads each comprising a main body and a spacer ri idly spacing a die member from the main ody forming an interspace for a purpose hereinafter explained; said die members being designated respectively, C and D the spacers respectively, C and D and the interspaces, C and D respectively.

3. The main operating shaft, E, journalled in-and extending longitudinally of the main base frame, A

4:. Power communicating means comprising a pulley, F, to be driven by a belt, from any convenient power shaft, said ulley being journaled on a fixed sleeve within which the shaft, G, extends transversely of the main operating shaft, E; a friction clutch device comprising a member, 10, slidable on the transverse shaft, G; a clutch-operating slide shaft, 12, parallel with said transverse shaft, G, and having a clutch shifting fork, 14-, operating the slidable member, 10, for engaging and disengaging the clutch; a spring, 16, coiled about the transverse shaft, 12, and stopped bet-ween a stop collar, 17, thereon, and the slide bearing, 18, of said shaft for ieldingly holding the transverse shaft, 12, tfirust in the dircc t1onfor causing the clutch shifting fork, 1 1, to hold the clutch member, 10, at clutch disengaging position; a rack, 19,on the transverse shaft, 12 and a starting lever, 20, fulcrumed on the slide bearing, 21, of said shaft, the lever having a gear segment, 22, engaging the rack, 1.9, for actuating the slide shaft, 12, longitudinally for engaging and disengaging the clutch members; and a locking dog, 162, carried by a short arm, 15, of the lever, 15, hereinafter further described, said locking dog engaging a stop collar, 12, on the shaft, 12, for lockin the shaft at engaged position of the clntc.

5. A worm, 30, on the transverse shaft, Gr, engaging a worm wheel, H, fast on the main operating shaft IE, whereby the latter shaft is rotated slowly by a relatively rapid rotation of the transverse shaft, fit, when the clutch members are engaged and the drive pulley, h, is being driven by thebelt, 7?, which is connected to the source of power;

6. Means by which the main operating shaft, E, actuates the top die-member-carrymg head, C, for closing and opening the mold, comprising air of facing earns, 35, fast on the shaft, whose facing grooves 35 are engaged each by a stnd-and-roll, St, on a lever, d, which is fulcrumed at one end on a bracket, A depending from the main base frame, A, and at the other end is pivotally connected with the lower vend of a link. 37, which extends upward to the top of the machine for actuating a lever arm, 38, of a rock shaft,39, which is jonrnalled in the upper end of the upright frame, B; a pair of crank arms, 40; and two-membered pitman, 42, 13, therefrom, connected with anddactuating said top diemember-carrying hea a 7. Two pairs of face cams, M, M, and N, N, fast on the main operating shaft, E, and for operating by means of levers, 55 and 56, respectively right and left hand horizontally reciprocable slide heads, 45 and 46, for carrying laterally related cores or other die members into and out of co-operate relation with the remainder of the die;

8.'A peripheral cam, K, fast on the main 1, operating shaft, l), co-operating with an up and down extending lever, 47, fulcrumed at 48 on a bracket, Aflsecured to the main base frame at a, said lever having a cam roll, 50, at the lower end engagin the peripheral groove, k, of the cam for oscillating the lever in a longitudinally vertical lane to actuate a longitudinally reciproca hie slide head, 51, which is engaged by the upper end of said lever, as seen at 52, for carryinga core, or other die member, indicated at 53, horizontally at right angles to the direction of movement of the corecarrying slide heads, 45 and as, into and out of co-operative relation to the parts of the die which are positioned by the bottom and the top diemember-carrying beads, C and D;

9.1% metal injector, R, mounted for sub merging its intake,--which is also the injection nozzle, r,-in the molten metal in the metal pot, W, for taking in through said nozzle a quantity of the molten metal sufficient for the capacity of the most ca acious die for which the machine is designs 10, Operating means for lifting and advancing the in ector, R1, and re istering its nozzle, r, with the mold nipple indicated at- V, and retracting and depressing the injector inrespect to its intake nozzle into the molten metal for filling the injector, said operating means comprising means for the two movements, via: (a) for lifting and lowering the nozzleend of the metal injector into and out of alignment with the filling port of the die, and (t) for advancin and till llld

ill?) llli retracting the injector for seating an 1111- lever arm, 39 of the rock shaft, 39, which operates the top die-member-carrying head, 1), so that the nozzle end of the injector is lifted. and lowered in time with the rocking of the shaft, 39, by which the head, D, is

lowered and lifted for closing and opening the mold. The second mentioned means for advancing and retracting the injector withv R, is provided extending rigidly rearwardly from the body of the injector. It will be seen that the cam, 35, by which the reciprocation of the top die-memb er-carrying head is controlled, and the cam, S, by which the advancing and contracting movement of the injector, R, is controlled, will be relatively formed as to their cainming portions to cause the two movements of the injector to co-operate properly for registering the nozzle with-the die and disengaging it therefrom in proper correlation to all the'movements of the diilerent parts of the die which are derived from the main operating shaft, E. The nozzle, r, of the injector is preferably made detachable from the spout, as may be understood from Figure 2, for the reason that it is liable to require somewhat frequent replacement because of deterioration from the severe service to which it is subjected in the frequent flow of molten metal and the necessity of seating hard at the die inlet. For making sure liquidtight seating at the die inlet it is taperedat a less angle than'the seat at the die inlet with which it registers, and its angle edge is sharply defined as distinguished from being blunted or beveled, so that the seating area is reduced as nearly as possible to a. mere circumferen- V tial line of contact.

The term of the throat or metal flow passage of the injector is of the form shown in Figure 2, viz, comprising a final or delivery part, 7*, very nearly straight and sloping,

when the injector is in position registered with the die,at such'angle that when the in'ector is in submer ed position for being filled by the inflow through the spout, this part of the passage is substantially horizontal, and the remainder indicated at r of the passage leading back into the bottom oi the metal reservoir cavity slopes more steeply than the part, making a distinct bend downward as seen at r". The purpose of this form of the passage is first, to ensure that the metal shall flow into the injector cavity through the passage, without ppssibility of trapping air at any point therein; and second, to ensure thatthe spout passage shall be full to the to of the nozzle when the nozzle is lifted an advanced'into registration with the die inlet.

' The construction of the valve which controls the admission of air to the metal injector for forcing tllfllIlOlteIl metal into the die requires particular description. This valve is a slide valve, 255, (see Fig. 23) carried by stem, 254, which has guide hearings in the part, 251, of a valve casing, T, which is mounted on the bracket, A, said stem extending through stuffing boxes, 252 and 253, at the lower and upper ends of said part, 251, which is integral with the bracket, A and supports the remainder of the valve casing to which the'letter, T, is applied (see,Figs. 22 and 23). The valve, 255, has in its seating face a rectangular cavity, 255", dimensioned for spanning two ports, 256. and 257, in the valve seat toward which said valveis pressed by springs, 255 reacting against the stem, 254. a I Compressed air from a source not shown enters the valve casing through a pipe, 259, and is admitted through port, 256 at the open position of the valve, 255,'seen in Fig. i

vented 258, it will be understood, accommodates the movement of the pipe, 259*, which is necessary for the movement of the injector, R, in Y advancing to and withdrawing from the mold as above described' In addition to the foregoing positively operated machine @elements deriving their movements from the belt driven the power shift, the machine comprises parts operated by compressed air and whose operation is controlled at will by the operator as follows:

11. A compressed air cylinder, 60, and piston, 61, therein, operating upon the admission of compressed air through pipe, 62, controlled by a valve hereinafter described for operating certain parts of the machine, The piston stem, '63, is pivotally stepped upon the top die-member-carrying head, D; and the cylinder, 60, suitably guided for reciplocation on the piston head, 64, within said cylinder, is connected at its lower end with one end of a lever, 65, lulcrumed at its oppositeend upon the upper end of an upstanding link, 56, pivoted at its foot on said head,

pulley on llu cally reciprocating rack bars, 74 and 74*, which are slidingly mounted for vertical reciprocationin the top-head, D, and which carry at their ends below the main body of said head, D, in the interspace, D a plate 82, which is slidably mounted on heade guide studs; 83, upstanding from the upper die member, D said plate, 82, having downwardly projecting studs, 86, which protrude through apertures in the upper die member,

D, for carr ing and withdrawing cores pertive length of the cylinder, and thereby the length of the possible stroke which the cylinder can make for operating the connected parts. A jam nut, 60, on the stem, 60", serves for securing the piston head, 60, at adjusted position.- Said head, 60, has a port, 60", extending through it for admitting the compressed air to the moving piston head, 0d.

12. A. compressed air cylinder, 00, mounted on a bracket, A bolted as seen at a to the main base frame, having its piston stem, 01, connected to one end of a lever, 92, which is. fulcrumed between its ends at 03 on a bracket, A bolted tov the main base frame as seen at a and connected at the other en with. vertically reciprocable member, 95, which is in the form of a yoke for embracing and obtaining slide bearing and vertical guidance upon the journal bearing, A, in the main base frame of the operating shaft, E, (said bearing being appropriated for this purpose as a matter of convenience in view of the necessity of positioning the part, 95, substantially in the vertical longitudinal plane in which the operating shaft is located), said yoke member, 95, being operatively connected, as hereinafter particularly described, with a plate, 06, equipped with means, also hereinafter described, for retracting the cores from the casting in the lower member of the die carried upon the head, C. The cylinder, 90, has the construction comprising parts indicated by the reference characters 00", 90 90, 90 9 0, corresponding to the parts of the cylinder, 00, denoted by 00, 60 60", 00 00 respectively.

13. A cylinder, 100, having connection for compressed air for operating its p ston, 101, which has a stem, 102, projecting through the lower end of the cylinder and connected to a lever arm, 108, of a rock shaft, 10%, which has a second lever arm, 105, connected miaeia mentioned rock shaft in relation to the vertical plane of the main-operating shaft, E, said second rock shaft 108 having two parallel lever arms, 109, projecting inwardly toward said vertical plane of the shaft, E, the first mentioned rock shaft having two corresponding lever arms, 110, projecting inwardly toward the arms, 109, respectively, said lever arms, 109 and 110, having their inner ends connected respectively to the lower ends of four similar upstanding links, 113, said four links carrying at their upper ends a plate, 114, which is provided with means hereinafter more particularly described for loosening from the lower die member, by upward thrust into, the casting formed insaid die member which iscarried on the bottom head. i

14. A valve for controlling the admission of compressed air to the metal injector for forcing the molten metal into the die; and a face cam, S on the shaft, E, having cam members 8 and s for operating the valve 255 in. valve casing member, T, to time the ad mission and cut-off of the compressed air suitably in relation to all the other movements dependent upon the rotation of the shaft, E.

Certain of the parts or elements above listed comprise details requiring specific description as follows:

The clutch device on the power shaft, G comprises the fork-engaged member, 10, which is a sleeve feathered on the shaft, and comprises a conical cam, 10*, and a friction brake disk, 10 cooperating with a disk G rigid with the frame member, A The cam co-operates with three levers, 11, fulcrumed on the sleeve at equal angular intervals around its axis and hearing at their inner ends at an oblique angle against the outer surface of a friction clutch member, 13, which 18 feathered on the hub of a co-op crating friction clutch member, 13*, which is keyed on the shaft, G, said friction disks facing each other for engaging between them a friction annulus, f, which is located within the flange which constitutes the pulley, F and held fixedly to the pulley by means of the key pin,'f a machined steel bushing sleeve, f being drive fitted within the pulley flange for seating said friction annulus, f, and a steel plug, i being set into the pulley flange F for receiving the key pin which is held inposition by said screw, all as seen in Figure 12. Springs, 13, interposed and reacting between the disks, 13 and 13, tend to hold them normally out of frictional engagement with the friction annulus, f. The disk, 13*, is stopped longitudinally on the shaft by the bushing and hearing sleeve, G which is fixed in the horizontal bearing member, G, for journaling the wheel, F, of which the pulley, F conoperating shaft, E, from the arresting means upon the occurrence of the driving engagement of the clutch, and for giving the operator control for arresting the action at any time upon emergency requiring such control.

For these purposes the wheel, H, has mounted upon its inner side an abutment, b and there is fulcrumed at 150 on a bracket, at, bolted to the main base frame,

. A, a latch,'151, which depends adjacent the inner side of the wheel, H, and is adapted to swing into position to be encountered by the abutment, M, as the wheel, H, revolves;

This latch has a lever arm, 151 extending at the outer side of the wheel, H, from which lever arm a thrust link, 152, extends upwardly alongside the journal bearing, a",

of the shaft, G, and thence through an aperture, seen at a, in the casing,.A which encloses the'wheel, H,"and the cooperating worm, and above said casing said thrust link extends up through a stop head, 153, which houses and stops a spring, 154, coiled around the thrust link, 152, and stopped at its lower end on the casing, whereby it reacts for upholding the thrust link and the lever, 151*, of the latch, 151, at the position of said latch out of the path of the abutment, 7a. The thrust link comprises a lower part, 152, constituting a sleeve with which the upper part telescopes and which carries a locking pin, 155, seated transversely of the telescopic engagement of the two parts and engaging trictionally in the side of the upper member of the thrust link, being provided with a spring, 155*, for enforcing such engagement. The two parts oi the thrust link operate as a unit for upward thrust of the link at its upper end against the end. portion of short latch lever, 160, which is pivoted at lei on a bracket, a which is mounton the casing, A, for carrying the slide bearing oi the rack it. The iatch has at its upper edge a cam slope or shoulder, 160*, and there is mounted upon the slide shaft, 12, a collar, 12, constituting or aiiording an abutment which has a cam slope, 1.2;", which co-operates with the slope, 150", or the latch, 160, in the slide movement of said shaft, 12, for engaging the power shaft clutch. 'It will be understood from this description that upon the clutch-engaging sliding movement of the shaft, 12, the latch, 160, is crowded downward at its free end thrusting downward the thrust link, 152, causing it to rock the latch, 151, about it's pivot and carry it to the full line position shown in Figure 5 out of the path of the abutment, h whereas before that action said latch, 151, is normally held by the spring, 154, through the connection of the thrust link, in the position shown in dotted line in Figure 5 in the path of said abutment, (2 The lever arm, 151, of the latch, 151, has at the end beyond the connection of the thrust link thereto, a cam terminal, 157, projecting its cam edge downward from the lower side of said lever arm. The purpose of this detail construction is. that a stud-- and-roll abutment, 158, mounted upon and projecting from the outer side of the wheel, H, is positioned with its path of rotation with the wheel, H, for encounter with said cam edge,-157, as the wheel, H, revolves in the closin quarter or third of its revolution, and crowds the thrust link upwardly with the effect of disengaging the lower part, 152, from the upper part and permitting said lower part to slide up along the upper part instead of forcing the upper part upwardly, such upward movement of the upper part being at that stage prevented by the latch, 160, which is locked against upward swinging movement. The upward swinging movement of the part, 151*, caused by the encounter of the abutment, 158, with the cam edge, 15?, operates for swinging the latch, 151, about its pivot away from'the full line position shown in Figure 5 to the dotted line position shown in said figure for encountering the abutment, h, if for. any reason the wheel, H, fails to come to rest upon the disengagement, of the driving ciutch which should occur by means hereinafter described,

The frictional engagement of the pin, 156, against the upper member of the thrust link, 152, is sufficient to hold the the lower member, 152 oi the link, and the arm, 151, of 11s the latch, 151, at the position to which these parts are forced by the abutmenhiiiS; and the latch, 151, will therefore remain in dotted line position to which it has been moved until the lower part of the link is forcibly slid down along the upper part to make the link operative to full length; and this reerrtension oi the link occurs at proper time as hereinafter described.

The lever, 15, hereinafter referred to as the tripping lever fulcrumed at 15 upon. the bracket member, a has a short lever arm, 15", which is connected the sliding detent latch, 162, positioned and guided for vertical movement in the bracket, a, for engaging the collar, 12, which is positioned on said shaft to be en aged at its right hand end, as heretofore described, by the detent latch, 162, at the retracted position of the slide shaft, 12, at which the power shaft clutch is engaged for driving the shaft, G; and the lever, 15, is provided with a spring, 15, reacting for thrusting the detent latch to its shaft-locking position shown in Figure 5. At the lower end of the lever, 15, it projects adjacent the outer side of the wheel, H, terminating in position to be encountered by the abutment, 158, after that abutment has passed the cam edge, 157, of the latch, 151. This encounter it will be seen rocks the lever, 15, in the direction to withiii) draw theksliderlatch, 162, out of engagement with the collar, 12, on the shaft, 12, thereby releasing said shaft leaving it subject to the action of the spring, 16, for thrusting it in the direction for disengagement of the power shaft clutch and engagement of the friction brake members, 10 and G and the power being thus disconnected, and the brake becoming simultaneously operative, the wheel, H, and'the operating shaft, E, and the entire power driven mechanism tend to come to rest; and it for any reason it fails to do so, the movement is positively arrested by the encounter of the abutment, k, with the end of the latch, 151, upon the wheel revolving a few degrees further after the disengagement of the clutch and encounter of the brake disks, 10 and G. And this positive stoppage of the mechanism will either cause disengagement of the clutch,whatever may have delayed such disengagement,or will cause the belt to slip and to be fed old the pulley. There is, however, provided an additional means which operates in the emergency which would result from the failure of disengagement of the clutch, or failure of the brake to arrest the rotation of the power shaft as described. This means consists in that the flange which constitutes the belt pulley, f is held to the friction annulus f of the clutch, for deriving rotation therefrom only by the key pin, 1, which will be sheared oil in case the etc of the wheel, H, by the encounter of t e abutment, 5 with the lever, arm, 151, should not cause the belt to slip on the pulley and eventually leave it.

The construction by which the sliding yoke member, 95, operates tor retracting the cores from the casting the lower member of the die which is carried" by the head, (3, requires specific description. Referring to Figures and 11 it will understood that the said reeiprooable member, 195, has projecting from its upper termed by a cross head plate, 9%, connecting side bars of its yolre term, a stem, 17d, which carries its upper end a double itaced rash bar, 171, whose opposite rachs engage similar pinions,

miaaia 172, 172*, at the opposite sides of said rack bar, said pinions being journalled in the lower or main plate or body of the bot-tom head, C, and at their opposite sides meshing with racks, 174, 174, which are slidably mounted in said lower body of the head, C, for sliding oppositely to the sliding movement of the stem, 170; that is, so that the upward movement of said stem with the yoke slide member, 95, causes downward sliding movement of the rack bars, 174, 174*. Said rack bars extend up through the said body member of the head, 6, and in the interspace, 180, between said body member and the bottom die member, C said rack bars carry a plate, 182, which is slidably mounted upon downwardly headed guide rods, 183, which are secured to and project downward from said die member, (3". Qn said guide rods above said plate, 182, there is positioned and guided for short up and down sliding movement between the die member, C and stops, 183, on said rods, 183, a plate, 185, serving apurpose hereinatter described in detail, said plate having apertures through which core-carriers, 186, which are carried rigidly by the plate, 182, extend for protruding also through apertures in the die member, C to carry the die cores in and out with respect to said die member.

The detail construction by which the plate, 11%, operates tor dislodging the casting from the lower member of the die mounted on the bottom head, 0, requires specific description. This means comprises thrust rods, 190, carried in the head, C, as best seen in Figure 10,'and stepped on said plate, 114,

through the medium of removable covers, 114, for apertures, 11 1", in said plate, 114, for a purpose hereinafter explained, said thrust rods extending parallel to each other upwardly in apertures, 0 provided in said head, C; said apertures extending through the head and registering with stems, 182", which extend down from the plate, 185, above mentioned, through registering apertures in the plate, 182, which has the coreoperating function above described. Said late, 185, has mounted in it and projecting rom it through suitable apertures provided in the die member, (1 knock-out pins, 191, to any desired number, and distributed as may be suitable for the particular casting to be produced in any particular die which may be mounted in the machine; and it will be understood that the plates, 182 185, have provision, b y means or? registered holes distributed over their respective areas, for

variable number of variably arranged corecarriers, 1.8%, to extend from the plate, 18 a casting-loosening or "hnoelr-out pins, 1 1, to extend from the plate,

The foregoing description oi? the construe tion operation of the corawithdrawing lid Ian

means associated with the lower head, will apply to the construction and operation of the identically operated and operating core-withdrawing means in the upper head, D, the parts 70, 71, 72, 72, 74:, .74 and 82 in the upper construction corresponding in form and function and operation to the parts 170, 171, 172, 172 174, 174;' and 182 of the construction associated'with the lower head, 0.

It may be understood from Figures 9 and 10' that the construction of the corewithdrawing means may comprise a plurality of each of the parts, 170, 172, 172*, 174, 17 1 in the lower head and the. corresponding parts, 70, 72, 72 74, 74 in the upper head, the multiplesof the several parts being arranged inrows 1 lengthwise of the heads, 6 and D, respectively as shown in Figures 9 and 10, and that in the lower head like, plurality of the thrust rods, 190, for carrying the plate, 114, in the lower head, and of the knock-out pins, 191, carried by said plate, 114, may be provided as seen in Figure 10v And it will be understood that for this purpose the multiple pinions, 172, 17 and 72, 72 ,-are carried on shafts in common for each group of pinions, said shafts designated 173, 17 3* and 73, 73*, being journalled at their ends and alsobetween the several pinions in the body of the respective heads, C and D, as seen in said Figures 4 and 13.

The detail construction of the. rack bars,

74, 74, and 174, 174*, as seen in Figures '4:

and 10 which shows one of the rack bars, 17 4, for convenience of assembling the structure consists in that each of said rack members comprises a central rod, 120, screwed into the plate which the rack bars carry, on which rod the rafck proper is mounted beingfor this purpose in the form of a sleeve, and being positioned alongP'the length of the rod by a spacing sleeve, 121, at the end toward the plate, and a nut, 122, screwed on to the rod at the other end of the sleeve rack proper, with an interposed washer, 123, between the end of the sleeveand said nut. The nut 122, is much elongated as shown, merely ror rendering it conveniently accessible at all positions, and the'plate, 96, has apertures, 97, to accommodate these nuts on the rack bars, 174;, 174 in the reci meeting movements of the racks and sai plate.

The operating connection from the link, 37 to the lever arm, 38, of the rock shaft, 39, comprises a link, 37*, pivotally connected with said lever arm at one end, and at the other end pivotally connected to the link, 37,

at one side thereof, the link 37 having at the otherside a slideway, 37, for sliding on the rock shaft, 39, which for that purpose protrudes from. its bearing on the upright frame, B, into said slideway which is re tained on said protruding end of the shaft by a narrow applied collar, 39.

The uprights constituting the frame, B, are tubular, as seen in Figure 9, and on the side toward the metal pot where the heat from the pot is intense, these tubular uprights are connected for circulation of water to cool the same, as indicated by the pipe nipples shown at b at the lower part of these uprights, which may be understood as designed for connection with a source of water supply, and the pipe nipple, b, at the upper ends of. these pipes, which may be understood as connection with a waste pipe to which the water will flow after circulating through the standards for cooling them.

Upon the outer sides of the tubular standards there are mounted sheet metal sheathings, B forming inclosures for accommo- ,der, 60, by which the upper c0re-operating rack and pinion devices are actuated, a valve, 66, is mounted on the frame in any positionconvenient for locating its operating lever handle, 66*, within convenient reach of the operator, standing at the forward end of the machine for operating the. clutch-shifting lever. The body of the valve, 66, is connected by a pipe, 66, with a source of compressed air, not shown, and by pipes, 66 and 66 respectively, with the'upper and lower ends of the cylinder, 60, the two latter connections comprising a flexible pipe portion, 66 and 66 for accommodating" the movement. of the cylinder, 60, as above described. For contro ling the cylinder, 90, whose piston operates the connections for actuating the core-withdrawing rack and pinion devices described, the valve, 97, is mounted upon theframe as seen in Figure 11 with its operating handle, 97*, extending within convenient reach of the operator, the valve body being connected by the pipe, 97', with a source of compressed air, and by pipes, 97 and 97? respectively, with the upper and lower ends or" the cylinder, 90.

For controlling the cylinder, 100, a valve,

116, is mounted on the frame as seen in Figure 4- with its operating handle, 116, extending with n convenient reach of the operator, the valve body beingconnected by a pipe, 116*, with a source at compressed air,

withthe head, D, whereby the move-' wheel,

and by pipe, 116, with the upper end of said cylinder.

All of these manually operated valves for controlling the compressed air operated devices are three-Way valves adapted at one position to closeall the pipe connections, at another position to open the connection with the source of compressed air and the connec tion to the upper end of the cylinder, and at a third position to close the connection with a source of compressed air and open the connection with the lower end of the cylinder and thevent port. The detail construction of the valves as described may be understood from Figure 15 which may be understood as representing any one of the three valves, 66, 97 or l lfi, the compressed air inlet being indicated at p, the port for connection with the upper' end of the cylinder at 12 the port for connection at the lower end of the cylinder, and the vent port at 7 From the foregoing description it will be understood that for operating the cylinder, 110, which has no air connection to the lower end, thethird position of the valve will not be used.

The several cams on the shaft, E, are relatively adjusted. about the shaft with respect to the clutch-releasing parts carried by the for causing the mechanism to come to rest with the upper head, l), and the lateral sliding heads, 4&5 and 46 withdrawn and the core-carrying parts associated with the upper and lower heads withdrawn with respect to said headsprespectively.

With the machine in this condition the order and manner of operating the machine in casting may be understood as follows:

The several members of the die comprising usually a bottom or body member, and a top member or cover, and lateral members or cores to be inserted and withdrawn laterally, mounted respectively on the lowor head. plate, 0 and the upper head plate, D on the lateral sliding heads, l5 and 46,

and the cores, it any, to be entered and.

withdra' n vertically, are secured to the proper pins in the lower and upper heads respectively,

'lhe die parts being now in condition for closing, still what may be called the rest posh ot' the mechanism, the operator moves 7 2 starting lever, 2t}, causing the t iereon' to actuate the slide gear shaft, l2, the clutch and bring the machine into operation under power,

in the a' stage at the resulting move ment the die-members are closed by the descent of the upper head and the move ment toward each other oi? the lateral heads, and at the same time the core-operating parts in the upper and lower'heads operate for thrusting the cores into place in both diamemhers, v a a u lln the neat stage the metal in ector is advanced in registration of its nozzle with the mold intake, and immediately following the registration of the nozzle with the intake the cam protrusion, 8 of the cam member, 8 operates for admitting compressed air to the injector chamber, and the metal is injected into the niold. The

wheel, H, in addition to the abutment,

into before the air pressure is withdrawn.

The operator governs theduration of this halting by operating the starting lever 20, at the proper limit of the halt; and the rotation of the shaft, E, being resumed, carries the several cams through their respective cycles to the point at which the lateral and forward end die members or core-carrying sliding heads, 45, 46 and 51 are withdrawn; and at this second stage "the abutment, 158", encounters the tripping lever, 15, and causes the disengagement of the driving means, causing the machine to make a second halt, duringwhich the operator operates the valve for admitting compressed air to the cylinders, andQO, for withdrawing the vertically withdrawable cores. W hen this, operation is completed, the operator opcrates the starting lever, 20, for starting the machine, which thereupon completes its cycle, opening the die by drawing upwardly the upper die member, D and. coming to rest by the disengagement of the clutch and operation. of the brake first above de scribed.

The operator then into action the compressed air cylinder, i130, for actuating the knockout pins for loosening and disenthe casting from the lower die member, C in this action it is to be noted that the rods, 1%, of such length to protrude up in the low r head, (3, only so that at normal. position of rest he parts asseen in Figure it, they terminate short oi the lower ends of the stems, 185*, S'l iicient distance so that the parts comprising theplate, i14 acquire considerable momentum in their npwardthrust caused by the piston of he cylinder, 100, l ore the rods, 190, collide with stems, so

for loosening and. dislodging it.

In practice, especially in the case ofcastings of considerable weight, the operator will usually repeat the operation of the compressed air valve-controlling cylinder, 100, opening and closing it more than once so as to cause the knock-out pins to deliver repeated blows at .very short intervals upon the casting to first ar it loose, and afterward thrust it up from its position in the die.

In Figures 7 and 8 there isshown a modified form of metal pot and injector. In this form the metal container and injector constitute a unit indicated at R R mounted fixedly in the heater element, W", and the entire structure,-herei'nafter referred to as the metal pot,is operated for movement bodily to carry the injector nozzle into and out of registration with the die inlet. The mounting for this purpose consists of a pair of bell cranks, 215 and 216, each fulcrumed at its angles indicated at 202, 202,

with supporting legs, 203, of the metal pot pivotally connected to the corresponding upper arms of the bell cranks, the lower arms being connected by link, 204. From the upper end portion of the lever, 118, an operating link extends to the upper part of the metal pot to which pivotal connection is made at 205. The rocking of the lever, 118, on its fulcrum, it will be seen, will move the metal pot in an upwardly convexly curved path in withdrawing from. and advancing toward the die, and the weight of the metal pot and connections operates for holding the metal pot nozzle firmly against the die at the inlet, tendingthereby. to take up all lost motion in the driving cam and connections.

In this construction the injector proper, R, is partitioned from the metal reservoir, B and receives metal from the reservolr through a port, 210, near the bottom pole of the reservoir and the injector. This port 1s controlled by a valve, 211, whose stem, 212, extends up above the pot and'is connected for operation by the lever, 212, which is fulcrumed at one end on a bracket, 214, upstanding from the pot, the opposite end carrying a weight 213, operating to hold the valve, 211, normally seated, excluding flow of metal from the reservoir into the injector. The lever, 212 is engaged near the weighted end with the horizontal arm, 215, of the bell crank lever, 215, 216, which is fulcrumed at its angle on a bracket, 217, upstanding from the metal pot; and the upper end of the arm, 216, of the bell crank is connected by a link, 218, to a bracket, 219, mounted on the frame. Upon considering this construction it will be understood that the withdrawal of the metal pot from the die automatically opens the valve, 211; and the movement in the opposite direction automatically closes it. The link, 218, is adjustable to vary its effective length by means of a sleeve, 218*, which is pivoted to the lever arm, 217,

plate mounted or and through which the link proper extends with adjustable stop screws, 221, on the link at the opposite ends of the sleeve. By this adjustment the accurate and certain seating of the nozzle at the die inlet may be secured. At 220 there is shown a pipe nipple at which connection is made with the source of compressed air controlled by the valve, 254, as described in connection with the preceding figures. It will be observed that the opening of the valve, 211, at the beginning of movement of withdrawal of the nipple from the die insures that the metal will not continue to be ejected from the nozzle by any remnant of air pressure in the injector after the nozzle leaves the die, because the vent opened through the port, 210, affords relief for the pressure, which is freer than that which it obtains through the nozzle and is opposed by less head of liquid than that contained in the nozzle.

For adjusting the pitman links, 42, 43, to vary their effective length, as is necessa for accommodating the position of the head, D, at closed position of the die members, D and C said pitman links areeach made-in two parts, 42 and 43, which are respectively exteriorly and interiorly threaded for screwing longitudinall one into the other. The part, 42, is swive ed to the pivot block, 42, by means of which it is pivoted to the crank wrist, 40; and adjacent to that pivot block, said part, 42, has an encompassing circular transversely projecting boss or flange which is peripherally notched forming a ratchet disk 42"; and a forked pawl carrier,-42", pivoted on the link member, 42, strides this ratchet disk carrying a pawl, 42, for engaging notches of the ratchet disk. A link, 43 connects the two pawl carriers, and a handle, 42, extending from one of the pawl carriers serves for operating in an obvious manner to adjust both pitma-n members, 42, equally by screwing it into or out of the member, 43, for increasing or reducing the effective length of the pitman links. I

The ratchet notches, 42 of the ratchet disks, 42, are parallel-sided to adapt them for being engaged by the pawl for rotating the pitman members, 42, in either direction; and the pawl which has one shoulder abrupt andthe other sloping is adapted to be swung over the pivot at which it is connected to the pawl carrier to trend for its feeding stroke either way-for screwing the member, 42, into or out of the member, 43, to shorten or lengthen the pitinanl We claim:

1. In a machine for having a die-member-carrying head, a corecarrying plate mounted for reciprocation with respect to said head; secondary rack bars constitutin carrying stems for said idance in said head; gear pinions journal ed in the head for 00- the purpose indicated

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