US965869A - Mold for brake-shoes. - Google Patents

Description

. B CARTER MOLD PUB. BRAKE SHES.

MTLIOAMON FILED Nov. 19, 190B.

Patented Mg. 2, w10.

senses;

CHARLES B. CARTER, OE CHBECAG, JELLINIS.

new non" :sanne-sirens.

speelronde of rendersene.

Patented fling. 2, i910.

Application filed November y19, 1903. t Serial No. ldd.

To allwhom it wia/y concern:

Be 1t known that I, CHAnLnsB. CARTER, a

. citizen of the gUnited States, and a resident of Chicago, in the count-y of Cook and State of llllnols, have invented certain new and useful Improvements in Molds for Bit-alteV ghoes, of which the following is a specifica- My invention relates to molds for brake shoes, and contemplates the casting of the shoe in a mold havinga permanent body providedwith an opening leading throughits Wall at a point ycorrespending 1n osition to the attaching lug of the shoe, an having a porous core inserted in this opening to com plete the mold at this point and to serve as a vent for the mold by reason of its porosity. ln this manner I am able vto obviate the greatest difficulty whichr has heretofore been Inet with in casting brake shoes in a permanent mold or chill, and which has resulted in the present almostexclusive practice of'casting these articles in green sand, notwithstandin that the vast number of such shoes require for the daily' use of the railroads, and the fact that they are for the most part exact duplicates of each other, naturally lends itself to more improved methods of molding.

Green sand castings for brake shoes not only involve an excessive cost. in the production of the molds, but are so rough that more or less chi ping and tumbling 1s ordinarily found to lie imperative. Whereas, by my improvement, the molding'cost of producing the shoes is not only greatly reduced, but l am enabled to turn the shoes out of the mold in such perfect condition that they are practically ready for market Without an further finishing, even in aV 'rattling barre ln the accompanying drawing illustrating a mold embodylng my invention 1n one Ifor1n--l `ig1;ure l is a longitudinal section taken on the line 1?- 1 of Fig.2, of ainold embodying my invention in oneform. Fig. 2 is a top\plan'vevv of thebody of the mold With the cover reinovcd.- Fig is a sectional detail, taken on line 3M?) of Fig. 1. Fig. 4. is a fragmentary plandetail showing a modified shape of lug forming recess adapted for receiving a slightly different form of venting core; Fig. 5 is a fragmentary detail in side elevation showing this modified form of core in place in the mold. Fig. die@ perspective detail'of the modified form of core.`

n said drawings, 1 designates the permanent body of the mold, ordinarily made of cast iron, and 2 its cope or cover. lThis lat ter may also be made in whole or in part, of metal, or may be made of lire brick, or of sand, for example, of dry sand baked in the manner usually followed in melting cores.

llhe mold will Apreferably be arted in the Waylindicated in `li`ig. l, an may be placed either side up, t. e., with the cope u permost, as the drawing shows, or 1With tie odyofl the mold uppermost, if this latter positionlng be deemed more r desirable for` pouring. lf the mold is to be placed With lts body portion lowermoet, as herein illustrated, the cope Will be provided with suit able openings 3 and d, either of which "may be used as a gate, While the other serves es a riser. lf the mold is to be placed' in an inverted position, or with the col e lovvermost, these openings v vill of course e formed,

in the body of the mold. lin either case, the mold Will, in accordance with this improve ment, be provided midway of its length and on the convex side of its main cavity 5 in whichtthe shoe is formed, With an opening 6 Whichlextends through the body of the mold to the outer air. This opening is closed, when the mold is prepared for pour ing, by a porous core 7, which completes the formation of the fastening lug on the back of thev shoe, and of the slot Which isformed n this lug for the reception of the fastening ey. Y

Preferably `the core Will `be made in the usual manner from dry sand, baked in an oven, arid inthe construction illustrated in Figs. l, E. and 3, it Will entirely surround the lug, except Where `the latter joins the ,body of the shoe, the lug thus being, as it were, cast Within the core. (lr the modified construction shown 1n Figs. 4l, 5 and may bc used, in which the lug is largely formed .i

by the metal walls of the mold, the core serv ing to form the slot for the locking key. In any case it will be understood that the core not only serves the purpose of completing the meldet the point Where the lug` of the shoe is located, but also serves to vent the mold at this point, the porosit of the material of which the core is ma e being great enough to permit the lescape of the air and gas which vvould` otherwise beV trapped here and cause the casting to be im- `mold at this point and coperates in the ide perfect.A It will be understood that the core Will :1ct in this manner, Whether the mold is poured with the one side up or the other. Brake shoes cast in a mold thus construct-ed need no finishing, but are practically ready for use as soon as they are cool, it being only necessary to knock ofi vthe sprues and load them for delivery.

In casting brake shoes With a steel back, like those frequently used for the drive Wheels of locomotives and in which the lug of the brake shoe is formed by e part of the steel back of the shoe, the core Will be used to prevent the steel lug from becoming enibedded in the molten metal, but Will otherwise act as already described, 2'. e., to coniplete the mold at the opening and afford vent at the point- Where the fastening lugr of the shoe is logated. I-Inrd metal inserts for the face of the shoe may also be siccomrnodated in this form of mold, substantially es in mqlds of green sand.

In case e metal cope is used, and the chilling effect on the fece of the shoe is found to be too great, a layer 9 of non-conducting meterial may he spread over the inner surface of the cope as :i facing to counteract its chillingaction.

1. A mold for brake shoes comprising :i permanent body portion and shaped internally to conformto the shape of the body of the shoe, and provided with :i` spruehole und with un opening lending through the wall of the mold :it e point corresponding in position to the attaching lug of the shoe, nfnd aporous plug inserted in said opening to complete the mold at this oint and serve as e vent therefor, substantiniily as described.

2. A mold for brake shoes comprising e metal body l and n. cope 2, said body being formed with an interior cavity 5 of the shape of the body of the shoe, und with n sprue-hole und also with an ripening (3 lending out from said cavity at the back of the shoe, and a porous solid plug 7 located in said .opening und venting the mold, substantially as described.

In testimony, that I claim the foregoingas my invention, I nthx my signature in presence of two subscribing witnesses, this 16th dey of November, A. D. 1908.

CHARLES B. CARTER. Witnesses G. M. ELLINGEN, K. A. COSTELLO.

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