US26394A - Improvement in casting boxes for wheel-hubs - Google Patents

Description

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UNITED l, STATES PATENT FEICE. i

rrHoMAS ELLIs, or PHILADELPHIA, PENNSYLVANIA, AssIGNoEg'ro HIM- SELF, w. A. ELLIS, AND A. D: ELLIS, DE sAME PLACE.

Specification forming part of Leiters Patent No. 26,394, dated December (i .'l'o @ZZ whom it may concern;

Beit known that I, THOMAS ELLIS, of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented a new and useful Improvement in Casting Boxes for Wheel-Hubs; and I do hereby declare that the following is a full, clear, and exact description of the same, reference bein ghad to the annexed drawings, making a part of this specification, in which- Figure l is a side Sectional view of a mold constructed so that the boxes may be east in accordance with my invention. Fig. 2 is a detached view of the core of the same. Fig. 3 is a side sectional View of a mold formed in the usual way for casting boxes, andillustrated in order to show clearly the advantage of my invention.

Similar letters of reference indicate corresponding parts in the several figures.

The object of this invention is to cast the boxes with internal diameters of uniform size by obviating the diiculty hitherto attending the varying position of the core relatively with the other parts forming `the mold, tlle change of position of the core within the mold at each casting very appreciably ali'ecting the dimensions of the interior of the boxes, as is `well known.

` To enable those skilled in the art to fully understand and construct my invention, I will proceed to describe it.

4A represents the upper and B the lower flask of a mold; C the sand, and D the recess or chamber made therein, which gives the external form to the box, a longitudinal half of this chamber beingmade in the sand of each ask by the usual pattern.

E is the core, which, as usual, corresponds to the desired form of the interior of the boxes to be cast. rlhis core is of dried sand, and has a conical projection or head, F, at each4 end, which about corresponds in diameter to the diameter of the chamber D at the points where said heads are placed. (See Fig. l.) The case may be formed by means of a proper mold, and the space between the projections or heads determines the length ofthe box. When the core E is tted in the chamber D and the two flasks A B placed together and sfo secured, as usual, by ,dowels a, the Inoldis formed, a-vent, b, being formed in the upper flask, A, to allow the molten metal to" be poured into the mold. The casting, it will be seen, is formed around thev core E and be? tween the projections or heads F. The position, therefore, of the casting around the core' f is arbitrary in all cases, every casting corresponding in this respect, 'and therefore the internal diameter of the castings-will be uni-` form, evenif the position ofthe core varies in the chamber D. The latter contingency, `it

Vwill be seen, would `only effect the external diameter of thebox. E y

It is necessary that the core E (including, of course, the projections or heads F) be shorter than the chamber D. Thisis necessary in order that the upper flask may be tted down on the lower one without havingthe ends of the core abrade orinar the ends of the I chamber D, which would be the caseV were the ends of the core (the projections or heads F) itted snugly against the ends of the chamber. By allowing a space, therefore, between the ends of the core and the ends of the chamber D,-as shown in Fig. l, `the upper ilask may be fitted on the lower one without the liability of injuring the mold. '.Thisshortness of the core of course involves a varying position of the same within the mold.` As it cannot always be placed in the same spot, there will be some-variation; `but in my `invention it can only effect the external diameter of the box-not the'internal, for the reason previously stated. The core, it'will be seen, if placed in the mold so that a greater space is allowedat the smaller end of the chamber D than at the larger end, will form a mold that will cause the internal diameter of the box to be smaller than if the core were placed in a reverseposition--that is to say,

with a greater space at the larger end of the chamber D. The variation in the diameter of the box externally is a matter of not much moment; but the variation of the internal di- "ameteris attended with "considerable embar-` rassment and expense, as the boxes, when l small,4 require to be reamed out in order to iit the arm or shaft of the axle. Whentoo large, there is no remedy, andthe box, when rotating, rattles on the arm, causing unnecessary .the ends of the core. These prints are made when describing the core E.-viz., to preserve ring to Fig. 3 that, as the core cannot always wear in consequence of the play which is al lowed it. i

In the old method of casting boxes the core E is made longer than the chamber D, (see Fig. 3,) and prints7 c are made in the same at the ends of the chamber in order to receive sufficiently long to allow a space at each end of the core, for the same reason as expressed the abrasion of the portion of the mold in the upper flask when the latter is adj usted on the lower ilask. Now, it will be seen by referbe adjusted in the same precise spot in the chamber D, the boxes will be cast with vary- "ing internal diameters corresponding with the varying position of the core within the chamber. It will also be seen that, besides this difficulty, if the flasks do not coincide precisely in the direction of their length, the ends of the boxes will be cast irregularly, and require to be ground off evenly, thereby materially shorteningthe boxes.

Having thus described niyinvention, what I claim as new, and desire to secure by Letters Patent, is'- Supporting the sand core E between two' sand heads, F, when the above parts are eni-`Y ployed in connection with a sand mold, C, in

the manner herein shown and described.

v THOMAS ELLIS.

Witnesses: l

A. H. SHOEMAKER, JOSEPH MEDDENs.

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