US1443341A - Pattern mechanism for castings - Google Patents

Description

PATTERN MECHANlSM FOR CASTINGS. FILED Nov. 25, 1921 2 EEEE TSSHEET I ///X//kf M INVENTOR.

51919211700 [Brow/v,

lf/$9.2M

A TTORNEYS,

1,443,341 B. T BROWN PATTERN Mac ISM, FOR CAST NGS v 25 I921 2 SHEETS-SHEET 2 HAN Flu-:0 No

Jan. 30, 1923.

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Patented Jan. 3%, 1923.

stares M- OFFICE.

nnAznLroN "r. nnowN,or INDIANAPOLIS, INDIANA, ASSIGNOR on ONE- HALF THOMAS H. KoMsTonK, or INDIANAPOLIS, INDIANA; j

PATTERN MECHANISM iron oAs'rI es; p

, Application filed emter' 25, i921. serial No. 517,702.

To all whom may-concern: I r J j Be it known that I, BRAZELTON T. BROWN, a citizen of theUnited-States, and aresident -of Indianapolis, county of Marion and v Stateof Indiana, have invented a certain new and useful Pattern Mechanism for Castings; andjl do hereby declare that. the following-is a full, clear, "and exact description, thereof, referencebeing had to the accompanying drawings, in which like numerals refer to like parts.

' Thisinvention relates to a pattern for castings, and more.*particularly' for that I type, of, castings surrounded by projections,

such as an annularbody having projections about the peripherythereof, or extending inwardly therefrom. 7

, .Heretofore it] has been diflicult to cast 'bodies, andnespecially annular bodies havin-gfprojecting portions surrounding them,

for the reason that after the sandis packed about the pattern, the pattern cannot be withdrawn therefrom, because of said. projections. n This invention contemplates the 2 construction of a patte rn of this type in which the projecting portions are movably mounted uponthe main body of the pattern,

wherebythey may be raised and lowered by means of a suitable tool. With this arrang'ement the projections may be lowered I into the body of the pattern by applying a tool to the outer end thereof after the shape thereof has. been impressed in the sand. Said projections having beenthus removed tern may be readily withdrawn therefrom inthe usual manner.' I I I The" particular pattern shown and de scribed herein is constructed for I use in casting a pulley having'V-sh'ap'ed projections extending transversely thereof with the vertex oi each projection positioned centrally between the ends of the pulley.

main body of the pattern so as to be with drawn radially within the surface ofthe body portion, so as to permit its ready re- I moval from the sand. I I

j I Theiull nature of the invention will be from interference with the sand, said pat t will be quite apparent that a pattern of this type understood from the accompanying draw mgs and the follow ng description and claims:

In the drawings, Fig. 1 is alfront eleva tion of the pulley, with one movable projection removed. "Fig. 2 is an endelevationhaving a portion of the end. broken away,

and the projections drawn in the body por- $1011. Fig. 3 is. the same as Fig.2 showing the projections in outwardly extended position. Fig 1 is a section taken on the line 14 of Fig. 2. Fig. 5isa section taken on the line 5-5 of Fig. Fig. 6 is an end elevation of a modified form with .a portion broken away, showing {internally extending gear teeth. Fig. 7 is 'a section taken on the line .7.7 of Fig. 6.

In the drawingsthereis shown a pulley I having a body portion 10 cylindrical in shape which is rigidly securedupon the hub. 11. Said hub is provided on each end with, bearing members 12 which support an annular drum 13- carried upon the spindles 14 extending into said bearings.

Said drum is, adapted to revolve'within the hub'll and be turned therein by ajtool engagingthe slot1-5 in the endof onegof th spindles 14. v I

The body po'j'tion 10 is .provided' witha plurality of recessed grooves 1601? the same configuration as the projections to becast on the finlshed product. Asshown herein the grooves lo extend inwardlyfrom each center so as to form a V-shaped groove curved about the peripheryof a cylindrically shapedbody. Mounted in thegrooves 16 so as to make a snug fit therein, there are movable projecting members 17 adapted Slidably mounted within the hub 11, and extending radially from the center thereof,

end of'the body portion, meeting atthe there are a plurality of supporting posts 18 which project through a suitable opening in the bodyportion 10 into the grooves 16. As shown hereinfthere is a pair of such radiallyv extending posts for each-" groove, as shown inFig. 1. The projecting members 17 are rigidly secured to the outer ends of said posts by means ofthescrews 19, so as to be carried thereon. Pivoted upon each end of the drum l3, spaced about the periphery thereof so as to extend radially therefrom at spaced intervals, there are a plurality of links 20 which extend through suitable openings in the hub 11 and are pivotedat their outer-ends to the posts 18,1

as shown in Fig.4, there being provided suliicient room in the opening through the body portion 10 to allowfor the free movement of said links therein adjacent the posts 18. The links20'are so arranged that upon the drum 13 being turned slightly in'one direction'by a suitable tool engaging the outer end of the spindle 14, the links will be moved in alignment with the 'posts 18. In this position said posts will be moved radially outward, carrying the projecting members'17 radially outward from the cylindricalsurface of the body portion bers'l'? and the body portion 10fwill be flush. When it is desired to cast a body having irregularly or angularly disposed projections'thereon, the pattern is made embodying the above described mechanism for extending and withdrawing the projections relative to the surface thereof, Said proje'ctions are extended as above described when'placedin the sand, and after the sand hasbeen properly molded t-hereon, said pro jections are 1 withdrawn and present a smooth" surface which will permit of the ready removal of the pattern from the sand.

As shown in Fig. 6, the same principle may be employed for casting a large numher of internal teeth of small pitch, wherein it is impractical to provide a pair of posts for each tooth. In this construction the body portion 10 is provided with a plurality of openings 30 into which the teeth 31 may ,be withdrawn outwardly for presenting a smooth-internal surface. The teeth 31 are provided with substantialbase portions 32 which fit snugly within the openings 30 when inext'ended position for guiding the tooth in its radial movement and maintaining it securely in its projecting position.

permit of the expansion and contraction necessary for the different positions in which said plates are moved radially from the center. Said plates are sli'dably secured The base portions 32 are integral with the toothed portion 31, and are slidably mounted-upon the spring metal plates 33 and 34 by means v of the rivets 35 extending into. said supporting members through short slots in said plates. Said platesare arranged with respect to each other so as to on the ends of the posts 18 which move within the housing 36, and are moved radially therethrough by the links 20, as above described. By means of this arrangement with comparatively few posts and links, a large number of teeth may beformedupon the pattern. W hen the links are moved in alignment with said posts, the plates are forced outwardly; and being formed of spring metal and slidably mounted with respect to said'posts and each other, their circumference may be contracted and the teeth 31 moved into projecting position for making a castingj' Upon moving thelinks in the opposite direction, said plates are expanded to their normal position and said teeth are pulled inwardly, so that the pattern will present a smooth-internai surface which may be readily removed from the sand. This construction may also befemployed in a like manner for operating a a large number of external teeth or projec tions.

it will be obviousthat other means may be used for simultaneously moving the teeth or projections in and out of the body of the pattern, such as a plurality of cam ,mem-

bers employed in place of thelinks 20. The invention claimedi's;

i 1. A pattern for making annular 'castings having a plurality of radial openings in the body thereof, projecting members mounted on said pattern and slidable in said openings, inwardly and radially extending posts secured to said members 'and ra'diallyslidable within said pattern, a rotatable member mounted within said pattern and a plurality of links pivotally' connected with said To tating member and links to force the posts whereby the rotation of said member will cause said post to slide inwardly and out- 2. A pattern for making annular castings.

having a plurality of radial openings therein, projecting members mounted in said pat-' tern and adaptedto slide inwardly and out- .wardly through'said openings, a plurality offposts pivoted to said members and adaptwardly radially of said pattern forcausing ed to slide radially within said pattern for" causing said projecting members to be forced radially inwardly and "outwardly with respect thereto; a rotating drum mounted. centrally within said pattern and, prov ded with a shaft supported in suitable bearings therein, and a'plurality of links pivotally mounted at one end to said drum and/at the other endto said sliding posts for causing said post, and projecting members irregular or angularly disposed projections to slide in and out of said pattern upon the about the surface thereof, projecting members mounted on said pattern, a rotatable member Within said pattern, supporting posts secured to said projecting members,

and a plurality of links pivota-lly connected to said rotating member and posts for causmg said pr0 ect1ng members to extend from said pattern when said rotary member is rotated in one direction, and be Withdrawn Within said pattern when rotated in the opposite direction.

In Witnesswhereof I have hereunto af fixed my signature.

BRAZELTON T. BROWN,

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