US148235A - Improvement in chilled mold-boards for plows - Google Patents

Description

NTTED STATES PATENT OFFICE.

JAMES OLIVER, OF SOUTH BEND, INDIANA.

IMPROVEMENT IN CHILLED MOLD-BOARDS FOR PLOWS.

Speciiicaton forming part of Letters Patent No. 1.118,235, dated March 3, 1874; application filed January Q9, 1874.

CASE A.

To all whom it may concern:

` Beit known that I, J Arms OLIVER, of South Bend, in the county ot' St. Joseph and State of Indiana,have invented certain new and useful Improvements in Ohlls for Casting Mold- Boardsi'or Plows; 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 fo rm a part of this specilication.

The nature of my invention consists in cast in ggrooves in the backs of chilled mold-boards, for the purpose of preventing the twisting ot' the mold-board in casting, as will be hereinafter more fully set forth.

In order to enable others skilled in the art to which my invention appertains to make and use the same, I will now proceed to describe the manner in which I accomplish the object, referring to the annexed drawing, in which- Figure lis a plan viewof flask and chill. Fi g. 2 is a view oi the back of the mold-board.

When melted iron is poured into a ilask containing` a mold-board chill, the iron that is to form the face of the mold-board casting comes in direct contact with the chill, which rapidlyT cools the face of the casting, thereby chilling or hardeningit to a greater or less depth. This chilling process contracts the face ot the casting, to the depth it is chilled, more than the back of the casting, which is not chilled, in

consequence of which the casting is sprung or warped out of shape to a greater or less extent, depending on the depth to which the metal is chilled. For instance, a mold-board that is chilled half through the thickness of the metal will warp more than one that is chilled two thirds through. This warping makes it diflicult to fit chilled mold-boardsto plow standards and points, and many are un'- iit for use after casting, while nearly all of them have to be ground, chipped, and iled on the backs, to make them lit properly, before they can be set up. To overcome this warping, I cast grooves in the back oi' the chilled moldboard castings at the point where they rest on the standards when set u'p for use.

In the back of the pattern D are made any suitable number fot' grooves, a a, ot' suitable depth, and the pattern, used in the usual manner, producing corresponding grooves in the back of the mold-board. These grooves effectually prevent the mold-boards twisting or'warping, byseparating in several sections that portion ofthe metal which forms the back or inclined part of the mold-boards, so that the backs, instead of being of one'piece, to warp or twist by theunequal contraction in cooling, have the warp, twist, or strain confined to the narrow sections between the grooves, thereby breaking the power of the strain, which otherwise would twist the castings out of shape.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

A series of grooves cast in the back of a chilled mold-board for plows, substantially as and for the purposes herein set forth.

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

JAMES OLIVER.

lVitnesses:

C. H. WATSON, HARRY O. SCOTT.

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