US147688A - Improvement in casting chilled mold-boards - Google Patents

Description

w.rAL-L. Casting Chilled Mold-Boards.

Patented Feb. 17,1874.

v INVENTOR Mm af WI TJV ESSES Attorneys.

UNITED STATES PATENT FFICE.

IVILIIIAM BALL, OF BATTLE CREEK, MICHIGAN.

IMPROVEMENT IN CASTING CHILLED MOLD-BARDS.

Specification forming part of Letters Patent No. lflJSS, dated February 17, 1874 application filed October 18, 1873.

i To all whom it may concern:

Beit known that I, WILLIAM BALL, of Battle Creek, in the county of Calhoun and State of Michigan, have 'invented a new and valuable Improvement in Chilled Mold-Boards; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings making a part of this specification, and to the letters and figures of reference marked thereon.

Figure 1 of the drawings is a representation of a sectional view of my device. Fig. 2 is a plan view of the same. Fig. 3 is a sectional, and Fig. 4i a detail, view of the same.

This invention relates to an improvement in casting chilled mold-boards forplows. It con-l sists in the employment of perforated or vented dry-sand cores, in combination with a castiron chillingplate for the purpose of allowing a free escape of steam and gases from between the casting and chill-plate, and therebyT preventing the casting from warping, as will be hereinafter explained.

The following is a description of 1n y improvement:

In the annexed drawing, A A represent the two parts composing the iiask, and B represents a cast-iron chill-plate, which corresponds in shape and size to the shape and size ofthe mold-board C. This chill-plate is permanently secured to the upper section A of the flask, and its top surface is conca-ve, for a purpose hereinafter explained. a a a represent drysand cores, which are inserted into holes made through the chillplate and arranged thereon, so as to leave the required bolt-holes through the finished casting. At or near the middle of the chill-plate two or more holes are made through it, into which are inserted dry-sand cores b b, having rectangular ventholes o through them.

When the two parts ofthe ask are brought together, as shown in Fig. 3, and the metal is poured into the mold, the steam and gases which are generated between the melted metal and chill-plate are allowed to escape downward into the sand in the part A through the ventholes c in cores b, as indicated by the arrows. The chill-plate B should be well heated before the metal is poured into the mold, for which purpose the upper side of this plate is made concave, as above stated, and intothis basin melted metal is poured. The vented cores b b, like the imperforate cores a, will leave holes through the casting, which I close by means of plugs that are ground down flush with the wearing or chilled surface of the mold-board in the process of grinding and smoothing this surface.

What I claim as new, and desire to secure by Letters Patent, is

Vented or perforated dry-sand cores b, combined with a chilling-plate, B, in molds for casting mold-boards for plows, to allow a free escape of steam and gases from between the casting and chill-plate. y

In testimony that I claim the above I have hereunto subscribed my name in the presence of two witnesses.

WILLIAM RALL. \Vitnesses 1 C. C. PEAVEY, GEORGE E. UIHAM.

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