US404239A

US404239A - wilder

Info

Publication number: US404239A
Authority: US
Publication date: 1889-05-28
Anticipated expiration: 1906-05-28

Description

(No Model.)

0. H. WILDER'. CORE FOR CASTING ORDNANCE.

N. PETERS, FhumLithngraphnr. Walhingifln. D, Q

UNITED STATES PATENT OFFICE.

CHARLES H. ILDER, OF NATICK, MASSACHUSETTS, ASSIGNOR TO FREDERICK E. ATTEAUX, TRUSTEE.

CORE FOR CASTING ORDNANCE.

SPECIFICATION forming part of Letters Patent No. 404,239, dated May 28, 1889.

Application filed March 31,1888. Renewed March 5, 1889. Serial No. 302,016. (No model.)

To aZZ whom it may concern.-

Be it known that I, CHARLES H. ILDER, of Natick, in the county of Middlesex and State of Massachusetts, a citizen of the United States, have invented certain new and useful Improvements in Cores for Casting Ordnance, of which the following is a specification.

My invention relates to a device for forming the bore or interior of ordnance or for [O analogous articles when the same are made from metal by casting, and its object is to produce such a casting with a bore smooth and free from cracks, flaws, and other defects now ordinarily found.

I 5- In carrying out my invention I form a core of the shape and dimensions required for the bore of the article to be cast, which core consists of an outer shell of coke, the exterior of which is of the form of the bore to be produced in the cast article, an inner or central metallic tube or pipe corresponding in length to the coke shell, and an annular filling of sand interposed between the coke shell and the tube. For convenience in manufacture and manipulation the outer shell of coke may be made of a number of sections fitted to each other, while the inner tube or shell will prefer. bly be constructed of iron or other suitable metal and in one piece. This tube acts 0 as a support or stay for the shell and sand filling, and its interior may be used to conduct a flow of water to cool the cast metal after the cast has beenmade. The filling of sand between the shell and tube serves to sustain the 3 5 shell against the pressure of the melted metal.

In the accompanying drawings I have represented at Figure 1 a perspective of a cylindrical section of coke, several of which put together make up the outside coke shell. Fig.

2 shows another view of a coke cylinder, the

top of which is fitted to enter the bottom of the cylinder of Fig. 1. Fig. 3 shows in vertitical longitudinal section a portion of the core, including two sections of the coke cylinders, the central tube, and the intermediate filling of sand. Fig. 4 shows in plan the outer shell, the sand filling, and the inner tube.

The outer shell of coke is marked a. The joint between two sections of the outer shell is represented at a. The central tube is marked a and the annular sand filling a A convenient method of forming or molding the coke for the outer cylinder .is by first grin ding it, then mixing it with pitch or coaltar into a plastic mass, then molding it in suitable molds to give it the desired form to produce the bore of the article to be cast, and, lastly, heating the formed coke in a mass of sand in a closed furnace until the whole is recoked, whereupon, upon being cooled, it is ready for use.

It will be understood that my improved core is intended to be used in vertical position and in connection with a vertical mold for forming the outside of the article to be cast. After the casting has been made and has cooled the outside of the mold may be removed, the inner tube of the core may be withdrawn, and the outer coke tube and sand may be removed in any convenient manner.

I claim The above-described core for use in casting ordnance and analogous articles, it consisting in an outer shell of coke, a central metallic tube, and a filling of sand between the shell and the tube, all substantially as described.

CHARLES H. XVILDER. lVitnesses:

WVM. E. PEABODY,

CHS. HOUGHTEN.