US 2096679 A
Description (OCR text may contain errors)
Oct. 19, 1937. s. H. GIBSON ,096 79 CHAPLET Filed 001:. 2a, 1955 31wentor SAMUEL H. 6/B50/V fl 'M Gttorncgs UNITED. STATES PATENT OFFICE CHAPLET Samuel H. Gibson,
Lakewood, Ohio, assignor to The Fanner Manufacturing Company, Cleveland, Ohio, a corporation of Ohio Application October 28, 1935,'Serial No. 47,082
This invention relates to an improvement in chaplets adapted for foundry use for positioning cores within molds during the pouring of the molten metal into the mold, and more particularly to an improved core tin therefor.
In casting of metallic articles in molds the greater the quantity of perfect castings that can be produced, the cheaper it is to produce them since any defective castings produced obviously increase the cost of the perfect castings. Among the more common causes for defective castings is the shifting of the cores in the molds during pouring which shifting is usually attributed directly to the failure of or to defective chaplets and to blow holes caused by the failure of gas generated at the chaplet to escape.
In my present invention I have provided an improved chaplet which may be properly positioned within a mold to support a core; which is easily and rapidly positioned by unskilled labor and wherein the liability of the chaplet damaging the core or permitting the core to shift during pouring is reduced to a minimum. Still another advantage resides in providing core tins for protecting the core from the ends of the chaplets which may be supported by the chaplets making it unnecessary to glue or stick the same on the core.
Still other advantages of the invention, and the invention itself, will become more apparent from the following description which, taken together with the accompanying drawing forms a part of this specification.
In the drawing:
Fig. 1 is an elevational view of the chaplet of my invention; 7 1
Fig. 2 is a bottom plan view of the core tin;
Fig. 3 is a view taken on the line 3-3 of Fig. 2;
Fig. 4 is a sectional view through a pattern and core box showing the manner of positioning the chaplets during the formation of the cope and drag of the mold; and
Fig. 5 is a similar view showing the core held in position.
Referring now to the drawing throughout which like parts are designated by like reference characters.
The chaplet comprises a cylindrical stem I which may be of any desired length and which has a collar 2 upset at some predetermined position thereon. A thin flat head or base 3 is secured to the stem l by riveting or welding and may be of any desirable configuration. The end 4 of the stem I is plain, the length being determined by the 'wall thickness of the article being molded.
Adapted to be supported on the end 4 of the stem is 'a core tin, which comprises a thin flat disc-like body 5 having a plurality of radially dis- 5 posed tongues 6 struck from the body and bent at substantially right angles to the body to form a socket 1. The socket is of substantially the same size as the end of the stem, and the inherent resiliency of the tongues permits the tin to be 10 quickly slipped on the end of the stem and provides suflicient frictional engagement with the stem to securely hold the tin in place thereon. The resiliency of the socket also permits tilting of the tin when necessary.
The operation of the chaplets of my invention is as follows:
The plain ends 4 of the chaplets are inserted in small holes in the pattern It! (Fig. 4) until the collar 2 engages the surface of the pattern. The 20 green sand is then packed in the usual manner about the pattern to form the cope and drag. After the cope and drag of the mold have been formed, the pattern is withdrawn which leaves the chaplets with their bases or heads 3 and stems 25 l embedded in the green sand II up to the collar 2 with the ends 4 extending beyond the surface to provide a support for the core.
The core tins 5 are next placed on each of the ends 4 after which the core l2 may be positioned 30 on the tins. The tins prevent the chaplet ends 7 from digging into the core. The cope may then be placed on the drag and the mold is ready for pouring.
Prior to my invention it has been necessary 35 to paste the core this on the core. This was a job for which the average workman employed about th foundryv was unaccustomed. The tins were small and inconvenient to handle; they had to be accurately placed in order that they 40 would coincide with the positions of the chaplets in the green sand. The result was that the tins often times fell off of the core before it could be placed on the chaplets. They were also sometimes improperly positioned and hence 45 aiforded no protection for the core from the end of the chaplets. Furthermore there were irregularities due to the manner of pasting the core tins which made some of them higher than the others which resulted in some of the chap- 50 lets not contacting with the core at all.
All of these disadvantages or difiiculties in op- V eration are eliminated in the present invention. The core tins can b quickly and easily placed on the ends of the chaplets by unskilled labor. 55
They cannot fall off and they are always of uniform height. Since they are attached to the chaplet there is no problem present of alignment between the tins and the chaplets. Being removable, they permit the pattern to have small holes for reception of the chaplets which thus provide a smoother mold; and being of relatively large surface area they provide a large bearing surface for the core.
The lugs on the tins might be formed otherwise than by striking them from the tin. For instance, a socket might be riveted or spot welded to the disc. Striking the tongues from the disc, however, gives an advantage in economy and in manufacture, and also provides holes in the disc through which the gases may escape, which is of importance since it permits the gas formed about the chaplet to escape, eliminating blow holes. The core tin socket providing a resilient engagement of the core tin with the chaplet permits the core tin to tilt when necessary to conform to irregularities present in the core, thus providing a self-aligning core tin which affords a more firm support for the core.
Having thus described my invention, I am aware that numerous and extensive departures may be made therefrom but without departing from the scope of the appended claims.
' I claim:
1. In a chaplet, a base, a stern supported by the base, a core tin for the end of the stem comprising a thin fiat metal sheet having lugs bent downward to form a socket adapted to engage the end of the stem to removably support said tin thereon.
2. In a chaplet comprising a base, a stem secured to and upstanding therefrom, a core tin for supporting a core and protecting the core from the end of the stem comprising a disc having lugs cut from the disc and extending downward to form a resilient socket to frictionally engage the end of the stem.
3. In a chaplet comprising a. base, a stem secured to and upstanding therefrom, a collar formed in said stem spaced'from' the end to limit the distance the core stem may extend into a pattern, a core tin for supporting a core and protecting the core from the end of the stem comprising a disc having lugs cut from the disc around a central axis and extending downward to form a resilient socket to frictionally engage the end of the stem and permit the core plate to be retained and readily positioned on the end of the stem after the chaplets are set in the cope and drag of a mold.
4. In a core tin, a thin flat metallic body, a plurality of tongues punched from the body about and spaced from the center of the tin, said tongues being bent downward to provide a chaplet receiving socket.
5. In a chaplet comprising, a base, a stem extending from said base, a collar in said stem for positioning the chaplet in a pattern, a core tin supported on the end of said stem and including a body portion for engagement with a core and a socket having resilient side walls for frictional engagement with the stem.