US546948A - core and chill for casting journal boxes - Google Patents

Description

(No Model.)

2 Sheets-Sheet I. T.

STING JOURNAL BOXES Patented Sept 24 1895.

(No Model.) 2 Sheets-Sheet 2.

S. WATT. I GORE AND CHILL FOR CASTING JOURNAL BOXES. No. 546,948. Patented Sept. 24, 1895.

lmmml W lllllll QMLMMW UNITED STATES STEWART WATT, OF BARNESVILLE, OHIO, ASSIGNOR TO THE WATT MINING GAR WHEEL COMPANY, OF SAME PLACE.

CORE AND CHILL FOR CASTING JOURNAL-BOXES.

SPECIFICATION forming part of Letters latent No. 546,948, dated September 24, 1895.

Application flied November 28 1894. Serial No. 530,268: (No model) To aZZ whom it may concern.-

Be it known that I, STEWART WATT, of Barnesville, in the county of Belmont and State of Ohio, have invented certain new and useful Improvements in Cores and Chills for Casting Journal Boxes or Bearings; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form part of this specification.

This invention relates to cores and chills for casting journal boxes or bearings, and its object is to provide cores and chills which when used, as hereinafter described, will produce a box chilled on its bearing surfaces and more durable than those heretofore constructed. The chill that hardens the upper part of the journal hearing or bore in the box extends through the bore and is made a part of the bore-core, the under part of the chill being preferably dovetailed, so that it may be fastened to the sand part of the core before the core is dried. When the core is dry, the chill forms part thereof and the complete core can be readily handled as one piece. The bore in the box is preferably a little oblong in crosssection to make the axle or bearing fit loosely therein and not touch the lower part of box. Ordinarily, in makingacasting with a straight chilled bore it is very difficult to get the chill out of the casting after it is made; but as my chill is only a part of the core when the casting is made the sand in the core comes out, and the chill, notLbeing the full half-circle, drops down and is easily removed, leaving a straight smooth bore chilled on its bearingsurface for the journal to work in. The axlejournal being smaller than the journal-bearing in the box does not bind on the chilled part of the box. I also propose to chill the ends of the box at and above the ends of the bore to harden the box to prevent it from wearing and to make it smoother than it would be if simply cast in the sand. To do this, I use end chills, which are separate from the core-chill; but when the core is placed in position in the molds the end chills are set on the ends of the core-chill, as shown. These end chills are also very useful, because a molder can do almost twice the amount of work using them as by the ordinary method, and do it much more perfectly. They also serve as anchors for the main core.

The invention therefore is summarized in the claims, and described in detail as follows, viz:

Referring to the accompanying drawings, Figure l is a longitudinal section view through a mold ready for casting a box. Fig. 2 is a transverse section through the same. Fig. 3 is a detail perspective View of the pattern. Fig. 4 is a view of the core detached. Fig. 5 is a view of one of the end chills detached. Fig. 6 is a perspective view of the completed chilled box. Fig. 7 is a detail section of a double chill-core.

Referring to the drawings, A designates the nowel in which the cavity of the mold is produced by the pattern P, which corresponds in exterior contour to the journal-box E, but has enlargements p on its ends, which produce recesses A in the mold-cavity to receive and support the ends of core 0 and also the end chills D. The core 0 is as large in diameter or slightly larger than the journal opening or hearing in the box and is longer than the hearing, so that its ends or core-prints resting in the bottoms of recesses A suspend the core in position to make the journal-bearing through the box. The core consists of a top metal chill c, which is less than half the circumference of the core, but extends the entire length thereof and is longitudinally dovetailed on its under side, as at c',so that when the sand portion 0 of the core is molded onto the chill the sand and chill are securely interlocked.

The end chills D D are metal blocks concave on their bottoms to fit upon the ends of 0 the core 0 and fill the remaining portion of recesses A, as shown.

The complete journal-box E has a substantially flat upper surface surrounded on three sides with a shallow flange E and has a central depression E through which is a hole E Below the fiat upper portion is the bore orjonrnal-bearin g e, formed by the core 0 in casting. The main body of the box is of ordinary castiron, but the part 6' thereof, (indicated by me shading,) forming the top of opening 6 and ex tending through the length of said opening, is

hardened by contact with the chill cin casting, and the portions 6 (indicated by shading) are also rendered very hard by contact with the chills D. It is not necessary to have the bore e oblong in section; but for a coal-car-axle journal-bearing I prefer it so. The bore, however, may be made round and chilled both top and bottom by using two chills 0. After the casting is made the sand part of core easily comes out and lets the chill part drop down to be taken out, leaving a straight smooth chilled hole for the axle orjournal to work in. When the pattern is drawn and the mold is ready for the core, the main core is put in the mold and the chills D placed in the mold on the end of the core 0, as shown. The small core d, that projects from the center of the main chill C, will form the oil-hole E The usual way is to drill the oil-hole; but to use the core (1 is much cheaper and just as good.

The top bearing of my box being chilled a hole could not be drilled economically.

In making a box or bearing for a journal to work in it is almost impossible to make the bore smooth enough on an ordinary core made of sand, and ordinarily after it is cast it is dressed out in a lathe or boring-machine. This is expensive. Besides, in order that it may be bored it must be made of soft metal, so that when it is finished it is too soft to be durable and soon cuts, causing additional expense and much inconvenience.

My chilled box or bearing requires no milling of bore, will last a great deal longer and is much cheaper than one made in the ordinary way, and the journal will run smoother than on one made on a core or bored out.

In molding my box or bearing no extra pattern is required, as the ordinary pattern is all that is necessary, and any flask that can be used to make an ordinary box can be used for mine, there being no extra expense for pattern or flask.

Having thus described my invention, what I therefore claim as new, and desire to secure by Letters Patent thereon, is- I 1. The herein described core for the purpose specified consisting of the chill portion 0 rounded on its outer face and dove-tailed on its other face, and the sand portion secured to the dove-tailed face of the chill, and forming a complete cylinder therewith, substantially as set forth.

2. The herein described core for the purpose specified consisting of the chill portion 0 rounded on its outer face and dove-tailed on its inner face, and the sand portion secured to the dove-tailed face of the chill, and forming a complete cylinder therewith, in combination with the metallic end chills D fitted on the ends of the chill c, all substantially as and for the purpose described.

3. The herein described core for the purpose specified consisting of the chill portion a rounded on its outer face and dove-tailed on its inner face, and the sand portion secured to the dove-tailed face of the chill, and forming a complete cylinder therewith, in combination with the metallic end chills D fitted on the ends of the chill c, and the core (1 on top of core 0, all substantially as described.

In testimony that I claim the foregoing as my own I affix my signature in presence of two witnesses.

STEXVART IVATT.

Witnesses:

G. H. KEMP, J. HOWARD.

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