US513968A - Self-feed and skim-gate mold - Google Patents

Description

0. A. HANSON. SELF FEED AND SKIM GATE MOLD.

(No Model.

Inventor: lzqrlesflanson THE runomu. umoamwnma CCIMFANY. WASHXNGTON. n. c.

UNITED STATES PATENT 20mins.

CHARLES A. HANSON, OF GADSDEN, ALABAMA.

SELF-FEED AND SKlM-GATE MOLD.

SPECIFICATION forming part of Letters Patent No. 513,968, dated January 30, 1894.

Application filed August 14,1893. Serialll'oASBJS. (No model.)

To all whom it may concern.-

Be it known that 1, CHARLES A. HANSON, of Gadsden, in the county of-Etowah and State of Alabama, have invented certain new and useful-Improvements in Casting Gar-Wheels; 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 casting car wheels, especially those of the hollow or double-web type; and its objects are to avoid the collection of slag at thehub of the wheel or periphery thereof by largely preventing the entrance thereof into the mold; to prevent pitting and sand washing of the mold by the inflowing metal, and to insure a uniform quality of metal throughout the wheel so that the chilled periphery may be perfect smooth and hard, and the core soft, clean and homo-.

geneous.

To effect these objects my invention resides especially in the peculiar construction of the center core, by channeling its head to form the gates when the core is in position within the mold; and it consists further in the novel construction and combination of parts hereinafter described and claimed.

Referring to the accompanying drawings, Figurel represents a central vertical section through a complete car-wheel mold,'illustrat'- ing my invention. Fig. 2 is a top plan view thereof. Fig. 3 is a detail view of the core detached. Fig. 4 indicates one half of the core box. Fig. 5 indicates the head print and core-gate print blocks.

In the drawings A designates the nowel or drag upon which is mounted the tread-chill plate B and superimposed thereon is the cope O.

P represents the complete car-wheel cast within the mold, and p is the plate-core within the wheelP- These may be of the form shown or any other suitable construction.

D, Fig. 5 is the core-gate-print block which is placed upon the hub of the wheel-pattern to form the recess a in the bottom of cope sand, adapted to receive the head f of the core F, when the pattern is removed and the core put in position ready for casting.

E Fig. 5 is the head print block which,

when the cope is being packed with sand, is

set upon block D, which is provided with a pin 01 to enteracorresponding recess e in the headprint block and forms the pouring inlet a of the mold. "The core F is cylindrical and of proper diameter and length to make the desired rough opening through axis of wheel. Its head f which extends into the recess 0 formed by the block D, is cylindroconically tapered, as shown, and at base is slightly larger in diameter than the main body of the core. In the sides of this head are made equi-distant channels f forming the gates, which are wider at bottom than at top, and at base the bottoms of these gates are about flush with the sides of the main body of the core. Preferably there are three or more of these gates.

The parts of the mold and the cores are'arranged as in Fig. 1. The metal poured into inlet 0' strikes directly upon the head of the core, and is thereby divided into three or more streams which poor through gates f into the mold. These gates being larger at top than at the point of opening into the mold (being about three-sixteenths of an inch wide to about two and one-half long) when the metal is poured into the head, thin streams of metal are directed into the mold in different directions and at equi distant points. This construction of the core-gates insures a steady flow of metal, and prevents chill-cracking as the metal rises evenly on the chill, making a smooth tread. Another advantage of the wedge-shaped gates is, that dull iron falling from the mouth of the ladle passes directly into the gates where its descending force is checked or retarded by the narrow mouths of the gates, and thus cutting or washing of the mold sand at the bottom of the mold is prevented, and owing to the slant of the gates the, incoming metal describes a parabola and flows evenly and rises gradu ally on the chill and when the wheel is poured and the gates choked by molten metal, the peculiar form of the gates prevents any dirt from passing therethrough, or settling therethrough, and they might be termed self skimming gates.

The gates produced by my invention will pass as much metal as the ordinary gates.

They have the same superficial area at both upper and lower ends. The upper end of the gate might be circular or square, but its lower end is long and very narrow. Consequently coarse particles which could freely enter the upper end of the gate would be caught and retained therein, being unable to pass through the contracted lower ends thereof; the molten metal also is thus disseminated and enters the mold in sheets while the ordinary gates direct the metal in jets or streams into the mold.

The core is produced with the gates at one operation, the pieces G forming the gates being fastened to the core-box as indicated in Fig. 4. The core-print block produces the outside or top wall of the gates, and the channeled core-head produces the sides and bottom of the gates. Another advantage result-- ing from the use of my improved gate-core, is that the pouring heads can be made much lighter than usual (in practice theyare about from ten to fifteen pounds lighter) and of course the expense of remelting the heads is lessened according to their reduction in weight and size; and this reduction in size of heads has a beneficial efiect in reducing the danger of bursting the wheels in casting, owing to high pressure.

As a result of the use of my improved core gates the car wheels are smooth and uniformly chilled at their treads, and at their hubs the metal is clean and homogeneous free from slag, rotten metal and sand, so that it can be safely and truly bored out to receive the axle.

The metal enters the mold through my gates in a circle about one fourth of an inch thick at the edge of the bore, and as usually, from one fourth to three eighths is removed by the boring tool, the gates ends are not visible when the wheel is completed, as they would be if the gates entered the mold beyond the bore or hub of wheel.

I am aware that it is not broadly new to pour the metal directly onto the heads or tops of cores in car wheel casting, and therefore That I claim as my invention is- 1. The combination of a nowel, and a cope having a pouring inlet and a core head recess; with-a core having a head fitting closely in said core-head recess, said head having inclined open channels in its sides, contracted at bottom,and forming gates adapted to communicate directly at their upper ends with the pouring inlet and at their lower ends with the interior of the mold at the sides of the core, substantially as described.

2. The combination of the mold having a pouring inlet with a core directly below said inlet having equidistant channels in its head forming gates communicating at their upper ends with said inlet, and at their lower ends with the interior of the mold, said gates being wider and of less depth at bottom than at top, so as to spread the metal in a thin sheet asit enters the mold, substantially as described.

3. The combination of a nowel, a cope having a pouring inlet and a conical core-head recess, and a core having a conical head closely fitting said recess and formed with inclined open equidistant channels in its sides forming gates communicating at top with the pouring inlet and at bottom with the interior of mold, substantially as described.

4. The combination of nowel and cope,having a head and a core pouring inlet recess with a core having a head fitting said recess formed with equidistant channels in its sides forming gates communicating at top with the pouring inlet and at bottom with the interior of mold, said gates being narrower at bottom than at top, and entering at the edge of the hub bore, all constructed substantially as and for the purpose described.

5. The herein described core F having cylindro-conical head f, formed with channels f contracted at bottom, all substantially as and for the purpose specified.

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

CHARLES A. HANSON.

Witnesses:

W. I. HERZBERG, W. R. WHITLoeK.

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