US1384438A - Casting-core - Google Patents

Description

H. T. EDWARDS.

CASTING CORE. APPLICATION FILED AUG-4, I920.

' Patented July 12, 1921.

UNITED STATES "PATENT OFFICE/1- HARRY as; EDWARDS, or SAN rn ncisco,

NAME 01* AJAX FOUNDRY COMPANY;

7 CALIFORNIA, ASSIGNOR crown-HALF T0 RUSSELL BERKENKAMIE, or SAN FRANCISCO, CALIFORNIAHTRADING UNDER THE fcAsrine-co'nn.

T0 aZZ who-m itmaay concern: a

Be it'known that I, I'IARRY T. EDwARDs, a citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, have invented certain new and 'useful Improvements in Casting-Cores, of which the followingis a specification. r

This application is a continuation ofmy allowed application Serial No. 320,252, filed August 27,1919. I

This invention relates to a casting core.

In foundry practice it has been a problem to properly anchor the cores of large castings, especially when the center of gravity or body of the casting is disposed when "cast, at one side of the vertical, and eccentric to its supporting surfaces, as in the production of pipe elbows and otherr'castings formed 011 the arc of a'circle. In most instances the cores for these molds have been made with elaborate core arbors and chaplets. When the casting has been made, it has, of course, embodied the chaplets in its wall, and in many industries, this piece of metal has weakened the wall, and often resulted disastrously. It is theprincipal object of the present invention,therefore, to provide a castingcore, which may be utilized in forming castings normally requiring anchors for their support jin'the mold, and which casting will be free of metal plugs in their, walls and when desired will be of substantially uniform thickness throughout. y y Inits preferred form the present invention contemplates the use of a casting core, the opposite ends of which are formec'l with downwardly converging sides. and a flat horizontal surface coinciding with the dividing line between the cope and drag of the flask, and which surface will receive the sand of the cope and hold the core rigidly without the use of other anchorage,but theinvention is not limited to thesepreferred features. t a A Such preferred embodimentof the invention is illustrated by wayof example in the accompanying drawings, in which- I I Figure 1 is a View in end elevation showing the formation of a circular core and the shape of the core print at the end thereof. Fig. 2 is a view in plan showing the drag portion of a flask and illustrating the shape diameter of the core.

v "Specification of Letters Intent, jPatfen te d 1 12 1 921 Continuation of application No. 320,252, filed August 27, 1919.

. Serial No. 401,157. i i

of the core used inconnection with a pipe elbow mold. r

a Fig. 3 isan enlarged view in vertical sect1011 taken centrally of an-arcuate mold and more clearly showing thezmanner in which the core is anchored by the combined action of the cope and drag. a r

Referring more particularly to the drawings, .10 indicates the drag J portion of a flask an'dll indicates its cope, these portions being used to form a mold for a casting which is not'symmetrical in its design but lies eccentric to its central axis and requires that thecore 12, therefore, shall be properly supported in :order to prevent its falling and thereby causinga variation in the thickness of the walls of the casting. The core, .111 the present instance is shown as having a body portion of circular cross-sectionand being fitted atits opposite ends with, ex

tensionslifi. These extensions have horizontal flat faces l lnwhich agree with the horizontal equator of the section as shown in Fig. 1. At the opposite ends of thislplane surface 14, downwardly converging side planes 15 and 16 areformed. In the pres- .ent instance, the sideplanes wouldrepresent the hexagonal face of a clrcle equal to the maybe united by a fiat face l'r'gof equal di mensions andwhich stands parallel to. the upper equatorial plane 14.1 In some in- This application filed August 4, 1920. I

The faces 15 and 16 y I stances, this last namedface l7 maybe eliminated and the lowercontour ofthe-corecontinned to. theend of the extension 13. It is common practice to form the extensions of jthe'..cores represented by fcore print fora considerable distance at the ends of the pattern, and this requires thatllarge and heavy cores must be made which in turn will necessitate the use of large flasks. Attention is particularly directed to the fact that in the present-instance and by forming the core print, as shown in the drawing, a very short core print is necessary with the result that for ordinary work the cores may be represent the mold of the article to be made.

. i i fteritliecope and drag fof the mold have been properly formed the core may-be placed inpo'sition with the extensions "13 in the recessed portions of the drag'as indicated by the numeral 18 in Fig. 3. It willbe understood that these recesses will agree in sectional formation with'the extensions 13' and ill th s prov de Op os n n d faces which will coincide with the faces 15 and 16 of the core while insuring that theequ toria ace 1 in will: lie directly, along the dividing line between the cope and the drag, The cope is then fplacedin position and W ll restjnpon the dragand the core in the] manner clearly shownin Fig. 3. It Will thus be seen that the sandin. the cope will act to hold the core print in position and will prevent rotation of the print due ,to'the fact that the vpressure upon the planel i will hold the faces 15 and'lti Within the recess 18' and as these faces coincide with the faces of the mold made bythecore print it will be impossible for the core to turn. This will insure that thecope will act to hold the core in a non-rotating and wedged position'and will provide uniformity. in the thickness of the upper and lower walls of the finished casting; After the casting has beenpoured it may be removed from the flaskandthe core very easily cleaned therefrom. An examination of the walls of the casting will thereafter prove that substantial uniformity in thickness has been maintained throughout the top and bottom of the structure/and furthermore, that the walls will be of uniform strength, due to the fact that no chaplets or anchors have been passed through the side walls. i x V It will thus be seen that-by use of a core formed as previously described, the sand-of the cope and 'drag Willact tohold the core imposition without the use of-anchors, chap- Jets or other supports and that irrespective of'the unbalancedweight of the core,a cast-i .ing may be madeihaving walls of uniformd thickness, the operation being performed with less material than is usually required and within flasks of smaller dimensions.

While I have described the preferred form of my invention, it will be understood that various changes in the combination, con

struc tion and arrangement of'parts might be made by'those skilled in the art, without departing from the spirit of the invention, as claimed. For example, while the preferredv and,apparentlysimpler formof my inventlon' involves an arrangement whereby the flat upper surfaces on the core extensions'coincide with the dividing line between- V the drag and cope, it is obvious thatjthe movement and rotation of the core can be preventediby the coengagement of the noncircular extensions with themolding sand of the dragand cope regardless ofwhether the extensions areprovided with fiat sun 7 faces which'are finsh'with the dividing line;

Conceivablyalso relations between the drag and the cope might be reversed from thoseshown in the drawing and hereinbefore] described.

I, therefore, contemplate such variations which embody my invention as setforth in any of the claims;

I cla m: I

l. A'casting core having core prints by which it is designed to be held immovable a i s ppo i e e d ha ing down rdly tending flat sides inclosed within the sand ofthe portion of the mold, and a flat faoeih a iemeiit w th epa t g l n f Y the ope and drag n pon w i t s d of the cope is adapted to rest to hold-the.

core aga nstmovement.

4 A castingcore'comprising a core body,

the weight of which is eccentric to its, point of support and hexagonal extending pr nts 0 Iormed at the ends of said core wlth their occurring along the dividing line of the cope and drag and upon which "the sand of the cope may rest to hold the prints in their a ed posi ions- V A method ofcasting, one step of which is to. an orhe cas i g core by t binding a ion. of e ops d drag por i nsof a mold, i no -the Core prints at the e d thereof. 1 V a "6; Am the ofanohori g o sti-ng o e, wh ch core is ofunbalanced weight in relati n. to a hor ta ine ton ing hrough its endpointsof su aport, said line agreeing I u upper iaces representlng llOIlZOlltill planes I with the line of separation of the, cope and drag of a mold, which method consists in forming the portion of the core within the drag port n of he j d ith prints h a i g ia upper fa s greoi s wi h the pa ing line and inclined side faces adap edyto rest ag inst the san a d pr v t rotation of he cor whe the op r st pon e upper-fiat aces oi sa prints r7 r 7, A method of; casting pipe elbons and the like which consists in providing a cylindrical core for the mold of said pipe, said core being formed With end prints extending. only withinthe drag portion. of a mold and having, fiat upper. faces. lying. along the 1'25 arting line of the mold'and inclinedside faces restlng. against the sand of the drag whereby thecombined action'of' thejthree I faces when the cope is, in position Will prevent'rotation or, displacement of the core.

8. A core to be used in casting pipe elbows and the like, comprising a body portion of a cross section agreeing wlth the interior of the casting to be made and adapted to lie with its longitudinal center along the parting line of the mold and end core prints extending from the ends of the body of the core and having an upper face along the parting line of the mold and side faces converging from the opposite edges of said upper face irrespective of the sectional formation of the core and for the purpose of holding the core against movement or rotation when the sand of the cope rests upon the upper faces of the prints.

9. A casting core in which the center of gravity lies at one side of its base of sup port when in the mold, provided with supporting extensions of non-circular cross-section adapted to seat in corresponding recesses in a mold for holding said core against movement and rotation.

10. A casting core, which is unbalanced relative to its points of support in the mold,

provided with supporting projections polygonal in cross-section extending from its extremities.

11. A casting core which is unbalanced relative to its points of support in the mold, provided with supporting projections having fiat surfaces and polygonal in cross-section, extending from its extremities, the said projections arranged so that the flat surfaces thereof are adapted to lie in said mold flush with the parting surface between the cope and drag portions of the mold.

12. A casting core which is unbalanced relative to its points of support 111 the mold, prov ded with supportlng pro ections extending from its extremities, having flat surfaces polygonal in cross-section, said pro- 7 .mg pro ections at its extremities of a polygj ections adapted to be anchored between the cope and drag portions of a mold to prevent rotation of the core.

13. A casting core which is unbalanced relative to its points of support in the mold, provided with supporting projections extending from its extremities having flat surfaces polygonal in cross-section, and converging sides.

14. The combination with the cope and drag port-ions of a mold, of a casting core in which the center of gravity lies outside of the points of support of said core in the mold, said core being provided at its extremity with supporting projections of non circular cross section and seated in correspondingly shaped recesses in said mold and held againstrotation by the cooperation of said cope anddrag.

15. The combination with a mold for the cope and the drag, said cope and drag portions adapted to anchor said projections in said mold to prevent the rotation of said core.

16. The method of anchoring an unbalanced casting core in a mold which comprises forming supporting projections of non-circular cross section on said core, positioning-saidcore in the mold with the projections in correspondingly shaped recesses in the mold and anchoring the same in position by the pressure between the cope and the drag.

17. The method or" anchoring an unbalanced casting core in a mold which comprises forming supporting projections of non-circular cross section of said core having flat surfaces, positioning said core in the mold with the projections in correspondingly shaped recesses in the mold with the flat surfaces flush with the parting surface between the cope and the drag and anchoring the core in position by the pressure between the cope and the drag.

18. A casting core having supporting extensions of non-circulaicross-section adapt-- ed to seat within correspondingly shaped recessesin a mold whereby the core may be held agalnst movement and rotation.

19. A casting core provided with supportonal cross-section and adapted to be seated in correspondingly shaped recesses in a mold and to be held against rotation by the pressure between the cope and drag portions of the mold.

20. A casting core provided with support ing projections at its extremity having flat surfaces and adapted to be seated in correspondingly shaped recesses in a mold with the flat surfaces flush with the parting surface between the cope and drag portions of the mold and to be held against rotation by the pressure between the cope and drag portions of the mold.

HARRY T. EDVARDS.

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