US1579938A - Core-pulling device - Google Patents

Description

April 6, 1926. 1,579,938

' E. HOTTER CORE PULLING DEVICE Filed DSC. 17' 1924 3 Sheets-She't l um... mn

April 6, 1926.

E. HOTTER CORE PULLING DEVICE Filed Dec. 17, 1924 3 Sheets-Sheet 2 April 6, 1926.

E. HOTTER CORE PULLING DEVICE Filed Dec. 17, 1924 3 SheetS-Shet I5 Patented Apr. 6, 1926.

ED'WRD Homann, C F CHICAGO, ILLINOIS.

CORE-PLLING DEVICE.

Application filed December 17, 1924. Serial No. 7758,406.

To ZZ lwhom, t mag/cmwern:

yBe it known that I, EnwAnoIIo'rrEn, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvements in Core-Pulling Devices, of which the following is a specification. v

'I his invention relates tocore pulling de vices for die casting machines. f

Ilcretofore, in mostcases, cores have been pulled by hand. rIhis is an expensive operation and requires. that the .dies be made larger than ordinarily required in` order to support, the rack Aand pinion pulling devices heretofore employed. In casting with alum'inumor zinc base alloys andA with tin alloys, the metal on cooling shrinks on the cores, making it exceedingly diflicult to withdraw the cores from the castings, and unless the cores are withdrawn at the proper time during the cooling operation it is impossible toy remove the cores without nielting lthe castings.

The main object of my invention is to provide a core puller so constructed as to exert more power in 'pulling the eoresthan the devices heretofore used and thus overcome sticking of the cores in the castings by shrinkage of the latter. I

A further object of my invention is to provide a core puller enabling a plurality of cores to be pulled either simultaneously or independently.

Another object of my invention is to so coi'istruct the core puller that it may accommodate cores arranged at different angles to the die mold and in different offset positions, thus making the puller adaptable for universal work.

A further object of my invention is to provide a simple and efficient construction which may be used in connection with most any type of die-casting machine.

The invention Consists further in the matters hereinafter described and claimed.

In the accompanying drawings Figure 1 is a front view of a core puller constructed in accordance with my invention and showing the parts with the cores in the die mold;

Figures 2 and 3 are horizontal and vertical sectional views, respectively, taken on lines 2`2 and 3 3, of Fig. 1.

Fie'ure 4 is a front view showing the cores withdrawn from the die mold;

Figure 5 is a View of the die mold to-show the guiding means;

Figure is a side view of the core puller;

Figure 7 is a top plan View thereof, the operating screw heilig shown in section;

Figure 8 is a view of one of the toggles to illustratie a detail of construction; and

Figure 9 is a perspective of the. casting made by the die mold and cores shown in Figs. l and 2. y

In the drawings 1, 1 `indicate the two pairs of vertically spaced horizontal supporting rods employed in a die-casting machine and on which rods is a power-operated slide 2.

The die mold construction is shown in Fig.`

@and as illustrated comprises two separable d ie members 3, 4. The die member 3 is carried by a box 5 on the slide 2. In this box works the pushof plate G with its pins aud is similar to the structure shown and described in my (zo-pending application Serial No. 7 51,779, tiled November 24, 1924.

The other die member 4 is carried by a box 7 on plate 2 which is held stationary in the machine.

As shown in Figs. 1 and 5, the box 5 is provided on the outside with two laterally projecting lugs 8,v 8. These lugs are arranged on opposite sides of the box and at opposite corners as shown. Said lugs carry guide pins 9, 9 and are adapted to enter holes 10,1() in the lugs 8a, 8a in the other box 7 to guide the dies in the proper register when closing the die. i

By having the guide pins 9, 9 outside of the die, the latter may be made smaller than heretofore because,` it is not necessary to make the die large enough for the pins to pass through it, as heretofore employed. This also reduces the. expense of the construction by reducing the amo-unt of steel required for the die. Moreover, only two o-utsidefguide pins are required for each die construction instead of four inside pins as heretofore.

In the drawings, I have shown the die so made as to produce the type of casting shown in Fig. 9. This casting has a. tubular body portion 11, and laterally projecting oliset bosses 12, 12 on opposite sides thereof with one boss adjacent one end of the casting and the other adjacent on the other end. For this type of casting three cores 13, 14, 14 are en'iployed. The core 1S is for the body part' 11 of the casting and the cores 14,

. end of a screw 18.

,the slide 15 is 14 are for the side bosses 12. These cores as shown in Figs. 1 and 4 are arranged with the cores 14.at right angles to the corel 13 and at opposite sides thereo The core 13 is carried by a slide 15, movable between guides 16, 16 mounted on the main slide 2 and adjustably secured thereto by bolts 17, 17. As shown in Figs. 6 and 7, provided on its rear side with to which is attachedlthe lower This screw extends through avthreaded boss 19 fixed to the main frame of the device so that on turning the hand-wheel 21 the slide 15 is moved to carry the core 13 into and out^of the die. The hand-wheel 21 shown in Figs. 1 and 4 is provided with a plurality of pins 2 2, which may be grasped by the operator on turning the screw.

On opposite sides of the die are slides 23, 23 each connected with one of the cores 14 a .boss 15 for moving these cores into and out of the device.

die mold. For each slide 23 there is a lever 24 fulcrumed on one of. the adjacent rods 1, as shown in Figs. 1 and 4. The lower end of each lever 24'crosses its associated slide 23 and by a link 25 is connected with its slide. As shown in Fig. 6, the slide 23 by dovetail or equivalent means is connected with a supporting member 26 carried by the main slide 24 are connected by toggle mechanisms with the slide 15 and guides 16, respectively. By this construction, the slides 23 may be moved with the slide 15 on actuation of the screw 18 to move the cores 13 and 14 into and out of the die mold.

The toggle mechanism for each lever 24 embraces three links 27, 28 and 29. These links have p-ivot-alconnection at their meeting ends. The link 27 is pivoted to its lever 24, the link 28 to the slide 15, and the link 29 to the associated guide 16 through a plate 30. Links 27 and 28 extend through blocks trunnioned on the'lever 24 and slide 15, respectively, so that these links may pivot about these parts in the operation of the The links are on center and are thus locked against accidental movement when the cores are in the die as shown in Fig. 1. On moving the slide 15 upward the links break and cause the levers 24 to withdraw the cores 14 from the die as shown in Fig. 4.

To regulate the movement of the cores' and thus control the distance that the cores extend into the die, two collars 31, 32 are provided on the screw 18 on opposite sides of a boss 19 forming a part of the upright frame 20, which also includes the guides 16. This screw has two sets of threads,- one on top of the other, with the main thread of a coarse pitch for moving the screw endwise. The fine pitch thread is for the collars 31., 32. The collar 31 is split and has 2. The upper ends of the levers a clampscrew 33 for setting the collar on the screw. The collar 32 is slotted and carries a. set-screw 34 for tightening the collaron the screw 18. After the cores have been brought to the proper position in the die the collar 31 is set on the screw 18 against the top of the boss 19 as shown in Fig. 6, and is then clamped to the screw. The device is then operated to com letely withdraw the cores 13, 14=from the ie and the collar 32 is then set up against the underside of the boss 19 and clamped to the screw 18 so as to control the travel of the screw 18 for the particular die for which the parts have been set. By these means it is possible to set the travel of the screw 18 for different lengths of cores.

The links 27, 28 are threaded and pass loosely through their. respective trunnion blocks 35 as shown. Each link is provided with two sets of nuts 36, 36 on opposite sides of its block 35. lVhen these nuts are brought against the blocks, the links are held against any endwise movement through the blocks in the actuation of the toggles. By adjusting the nuts on the links the travel of the cores 14, 14 may be accurately adjusted. By adjusting the nuts 36 away from the blocks 35 lost motion (Fig. 8) is provided in the toggle action, thereby permitting the 'device to withdraw any particular core 0r set of cores from the -die independently of the action of the other core drawing parts. By this construction the device may be used with cores having different lengths and the cores moved in timed relation so as to withdraw all of them from the die either dependently or independently.

For the links 28 the blocks 35 are mounted between an outside plate 37 and bracket lugs 38 on the slide as shown in Figs. 6 and 7.

i As shown in Figs. 1, 4 and 6, a block 39 is connected by dovetailfor equivalent counection in the bottom of the slide 15 so that this block may have adjustment toward and from the main slide 2. A plurality of T slots 40 are provided in the underside of the block 39 andthese slots extend across the block transverse to its adjustment with the slide 15. Fixed to the upper side of the die box 5 there is a bracket 41 through which the core 13 operates and has its upper end headed and received in one of the cross slots 40. The bracket 41 extends outward overv the die member 3 so that the core'13 may enter the die. By having a plurality of cross slots 40 the core 13 may be used with dies of different depths. The block 39 1s not clamped to the slide nor is the core 13 clamped to the block, thus allowing the core to center itself with respect to the cavity in the die so that the core will be withdrawn straight out of the die without binding against the casting, to crack it as frequently happens in devices as heretofore used.

The lower end of each 'lever 24 is provided with anelongated slot 42 as shown in Fig. 6. The outer end of the link 25 ex- 'tends through this slot and is pivotally connected with lugs or ears 43 on a plate 44 clamped by bolts 45 to the lever 24 at the slot. ,'.lhe plate 44. is also slotted for the outer end ot' the link to extend through, as shown in the drawings. The bolts 45 extend inward into the slot 42 and have the heads at their inner ends in grooves 4G -in thejlever 24, as shown in the drawings.

As shown in Figs. 2 and the' inner end of each link 25 engages about a bushing 47' on the associated bolt 48 carried by the slide 23. The inner end ot the buslnng engages teeth forn'ied in the slide 23 as shown, there,

being a clamp nut on the screw to hold the bushing from. slipping on the slide. This slide 23 is provided with a T yslot 49 to receive the headedinner end ot the bolt 4S, so that adj ustlnent of the parts may be made when required. .g

As shown in Fig. 2, the slide 23 is L- shaped and arranged with the right-angled part 50 extending outward from the main slide 2. A block 51 has a dovetail or equivalent connection with the part 50 so as toV have adjustment to and from the main slide This block is provided on its front side with a plurality ot' cross grooves 5la adapted to receive the headed end of the associated core 14, by means of which the core is connected with the slide for moving the core into and out of the. die. The core 14 moves through a bracket lug 52 on the box 5 in the same manner as the structure described for the core 13. lVith the core 14 adjustably connected' with its slide withoutv 'lo accommodate this change in leveragel the plates 30 by bolts 55 having their heads in T slots 5G in the guides 16. 1G may raise and lower the centers about which the links 29 move in the operation of the device. rlhe angle plates 26. 2G are secured to the sides ot' the main slide 21, bolts 4.'37, 57 having their heads in T slots 58, 5S inthe slide 2 for vertical adjustment'.

lVhile I have shown and described herein in detail a core pulling device of my iuvention, it is of course to be understood that the details of construction and arrangement of parts may be variously changed and modified Without departing fronrthe spirit and scope of the same.

I claim as my invention:

1. In a die-casting machine, the combination with a die mold having cores arranged about the saine, ot a core pulling device having'meanls` for movingsaid cores either simultaneously or independently into and out of the die mold,:md means for adjusting the extent of travel of the cores into the die mold.

2.k In a die-casting machine, the combination with a die mold having` cores arranged about the same, ot' a core pulling device having means tor moving the cores either simultaneously or independently into and out ot the die mold, and meansl for varying the power exerted by said device.

In a die-casting machine, the combination with a die mold, oi'acore pulling device on said machine and having a plurality of cores arranged about the die mold, and means inrludin, r a toggle mechanisn'i and a screw for moving the cores into and out of the die mold on the actuation of said screw.

4. In a dieeasting machine, the combination with a die mold, of a core pulling de-A vice on said machine and having levers for operating cores on opposite sides of the die mold, a toggle mechanism and an actuating screw lor n'ioving the levers to carry the cores into and out of the dieJ mold, said levers bein-g adjustable for varying the leverage exerted thereby on the cores.

5. In a die-casting machine, the combination with a die mold, of a core pullingdevice on said machine and having levers for operatingcores on opposite sides of the die mold, a toggle mechanism connected with said levers `for moving the cores into and out ot' Athe die mold, means for providing lost motion in the action ot the toggles for regulating the travel of the cores, and means for actuating the toggles.

6. In a die-casting machine, the combination with a pair of stationary rods, of a die mold there-between, a core pulling device having a pair of levers fulerumed on said rods and operating cores on opposite sides of the die mold, and a toggle mechanism for actuating the levers for moving the cores into and out of the die mold.

7. In a. die-casting machine, the combination with a die mold, ot a pair of' levers fulcrumed on the machine on opposite sides of the die mold for moving cores into and out of the die mold, and a toggle mechanism for actuating said levers. said mechanism heilig adjustable for regulating the locking action of the toggles.

8. In a die-casting machine, the combination with a die mold, ot' a main slide, a pair of levers ulcrumed on the machine on op-A posite sides of the die mold tor moving the cores into and out of the same, and toggle l et) l mechanism for actuating said levers "and having screw-tlireaded links extending loosely through blocks trunnioned on the levers and slide, respectively, clamp nuts on said links for providingA lost motion in the toggle action. l f v 9. In a die-casting machin-e, the combination with a die mold, of a core pulling device including a lever fulci'umed on the machine and having one end at one side of the die mold, and means interposed between the lever Aand the' die mold for converting the arcuate movement of the lever into a .straight line movement for moving the core into and out oi the die mold.

10. In a die-casting machine, the combination with a die moldof a. core pulling device including` a lever fulciumed on the inachiiie and having one end at one side of the die mold, a slide between the lever and the die mold and engaged`witli a core, and a link connecting the lever tothe slide for moving the core into and out of the die mold in the actuation of the lever. j

11. In a die-casting machine, the combinationwith a die mold, of a core pulling device including a lever fulcrumed on the machinefand having one end at one side of the die mold, a slide between the die mold and lever and connected with a core, and a link connecting the slide to the lever for moving the. core into and out of the die mold, said link having an adjustable connection with the slide.

12. In a die-casting machine, the combination with a die mold,.of a core pulling device including a lever iulcrumedion the machine and having an end at one side of the die mold,a slide between the lever and the die mold and connecting with a core, and a link connecting the slide to the lever for moving the core into and out of the die mold, said slide having an elongated slot to receive a bolt carried by the link with a seriated connection between the slide and the bolt for ladjusting the travel of the core.

13. In a die-casting machine, the combination witha die-mold, of a carrying member therefor, a core pulling device associated therewith and having core operating slides opei'able in the saine plane and arranged .above andon opposite sides of the die-mold, -andmeans for mo'ving the slides either simultaneously or independently for moving the cores into and outof the die mold.

14. In a die-casting machine, the combination with a core and "the die carrying member, of a core pulling device including a slide vcarried by said member, and a block carrying said core and adjustably mounted on said slide to adjust the position of the l5. In a die-casting machine, the combination with the die carrying member, of a core pulling device-including a plurality of die and one above the saine, levers fulcrumed on the machine and connected with the slides on opposite sides vof the die, a screw connected with the slide above the die for moving the saine, a toggle mechanism operated by said screw and connected with said levers for operating the saine.

16. In a die-casting machine, the combination with the die mold construction having a core guide, ofa core pulling device including a slide for the core and a block carried by said slide and having a groove to receive the outer end ot the 'core so that the Vcore may have a centering action on moving into the die mold through the guide.

17. ln a die-casting machine, the coinbination with the die carrying member, of a core pulling device including a frame on saidmember, a slide in said frame and cai'- rying a core for the die, a screw having a shallow thread and a deep thread with the deep thread engaged with the boss on the frame and connected with the slide for actuating the same, adjusting members engaging the shallow thread lof the screw and on 0pposite sides of the boss. for adjusting the travel of the screw.

l8.`In a die-casting machine, the combi-' nation with the die carrying member, of a coi-e pulling device at said member andhaving a lever fulcrumed on said machine for moving a core into and out of the die, a toggle mechanism connected with said lever for moving the same, said lever being adjustable to vary the leverage thereof and said toggle mechanism having adjustable connection With a fixed part of the device for adjusting the toggle action to accommodate for the adjustment given to the lever.

19. In a die-casting machine, the combination with a die carrying member, of a core pulling device including slides on said member and arranged about the die mold with coresconnected with said slides, a toggle mechanism and a screw for operating said slides, and a hand Wheel with grab pins connected with said screw whereby the same may be turned. A

20. InV a die-casting machine, the combination ,with a die mold, of a core pulling device on the machine at said mold and including a lever fulcrumed on the machine, a slide'between the mold and lever and connected with a core, a link between the slide and lever, said link having its ends pivoted to the slides and lever, respectively, and having adjustable connection with said respective parts, and means for actuating said ever.

In testimony that I claim the foregoing as my invention, I afx my signature, this 12th day of December, 1924. f

EDVARD HOTTER.

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