US1456869A - Metal casting and process of making metal castings - Google Patents

Description

May 29, 1 923.

D. CORDINO METAL CASTING AND PROCESS OF1MAKING METAL CASTINGS Filed my 14. 1.922

Fig. 6.

Patented May 29, 1923.

DOMINiCK oonnrno, or PLYMOUTH, urnssnoinisirrr's.

METAL onsrrrio'nnn rn oonss or Martins asai. amines;

Application filed August 14, 1922. 1 semi no. 581,836.

ToaZZ whom it may concern:

Be it known that I, DOMINICK OORDTNO, a citizenof the United States, reslding at Plymouth, in the county oi: Plymouth and State of Massachusetts, have invented new' and useful Improvements in Metal Castings" and Processes of Making Meta-l Castings,

of which the following is a specificationr My invention relates to the method of making metal castings, and the object of tures of Various kinds'in gas and oil-stoves and other castingsfor the purpose of concealing; the fastenings on the race of the work, .it is customary to cast a lug 'or lugs onthe inside of onecasting and to drill" a hole in the lug'and then tap a screw thread therein for the reception of a bolt or screw.

These-means are subject to a number of ob jecti'ons, and among them are: first, the

danger of forcingxtheidrill through the casting-and-thereby destroying or defacing,

it; secondly, of breaking the' tap by not judging the distance accurately and by driving it against the bottom of the hole. In some situations it is awkward to-use the drill and tap because of difficulty of access to the particular position of the lug, all of which accentuates the risk of forcing the drill through the casting and breaking the tap, and also makes accurate drilling and tapping difiicult, if not impossible.

My invention consists of a process of casting metal for the attainment of the foregoing objects, of certain novel devices to be employed in such process, and of the article produced by the process. I

In the accompanying drawing which illustrates some of the devices used in practicing my process, Fig. lIis a perspective view of an attachment to the pattern used in forming the mold; Fig. 2 is a perspective view of a chaplet. incorporated into shown'in Fig. 4. Before making the mOl the casting during the molding,p'rocess;;

chaplet and contents before casting, Fig.

4: is a plan View of a casting molded by? my process; Fig; 5' isai vertical section of one of the lugs? throughi the line in: .Fig; 6, which is an enlarged perspective elevation of one of'the lugs/7. j p

The first stepin my procejs s isitq Secure to-the pattern one'ormo're attachments 16 like thatsh'ow'n in Fig."'1,mad e of suit able material, preferably brass,' the nuinber' and t of these ft whmen sa ein governed by the requirements ofif/qhg of a particular casting. Theseattachn'ientsj.

are in" the form of a socket'toreceiyie the chaplet 9.v The upward" extensions 13,1? ?3,

ot the attachments 1 6 are" of ulletlll ili heights; the extension 13? being shorter,

than the extension 13,so as: to provide an opening in the cast lug for the" reception of a nut into the ehaplet.

Fig. 4: illustrates a casting S'deSigned' to, rave another castingor panel secured to it' at the four points indicated the lugs 7. In molding such a casting asf8, there'wou'ld' be four of the attachments 16 secured toflthe patternin the same relation, of course, to each other as the lugsf'l', on' the castin a Chaplet 9, shown in Fig. 2,1:iiade of sheet metal or other suitable material," is inserted in each attachment 16 on the pattern. The" upper portion of the chap'let is'ffilled with a core 11', as shown in Fig. 3,ca-pable of b e-' coming disintegrated by the molten metal,

but remaining intact during the molding,

process suificientlyl to prevent being. [dis-.1

placed by the pouring of the metal," Below the core 11 is a narrow space 12 as, shown in Fig. 3. The chaplet'containing the core 11 is inserte d" in the attachment 16' in the pattern, with its open ends", adjacent to the. upright portions 13, 13 of the'attjachment 16, whereby the molding. sand cannot enter the space 12 in the chaplet 9,.iduring the making of the mold. The attern is then placed in the molding sa'n in theusiial manner for casting with the attachments 16 on the upper side of. the pattern, and when the cope is raised from the drag, the chaplet 9 being light and loosely resting in the at tachment 16, is lifted by the cope to which it adheres. The pattern is then removed from the drag, the cope is closed and the metal poured in the usual manner. 'By reaino son of the extension 13 of the attachment 16 being shorter than the extension 13, and not reaching to the top of the chaplet, the cast lug is open at the top on the side corresponding to the extension 13". The result is that lugs like the lug 7 are cast, in which the space 12 in the chaplet 9 is filled with metal which flows into the chaplet through the opening 17, and the core 11 is so disintegrated by heat that it is readily removed. when the castings are rattled, leaving the upper portion of the chaplet 9, and the hole 18 therein open. The space left in the upper portion of the chaplet by the displacement of the core is sufficient to admit a screw threaded nut 10 in the top, and to leave an open space below it and above the metal 19 which forms the bottom of the chaplet alter casting, as shown in Fig. 5. In Fig. 6 is shown the nut 10 inserted in the chaplet 9. The chaplet 9 is flaring at the top for the purpose of receiving the nut 10 and forming shoulders for supporting the nut 10 so as to leave the open space 14 below it. After the casting is made, a nut 10 of suitable size and having a screw threaded hole, properly located to coincide with the hole 18 in the chaplet 9, is inserted into the top of the chaplet. It is desirable to have the nut fit snugly so as not to become easily displaced. This arrangement permits of the removal of the nut at any time, if desired, and replacement of a new one for the purpose oi making repairs.

Referring to the casting 8 in Fig. 4, each of the lugs is provided with a screw threaded hole 18 in its top to receive a screw or bolt 15 for the purpose of securing another casting thereto. It is obvious that by this method oi casting, the holes in the lugs are accurately located, that all danger of defacing the castingby accidentally drilling through it is obviated, and as no tapping of the thread is required, there can be no breakage of taps. The screws or bolts employed are selected with reference to their length, so as not to extend to the bottom of the space let shown in Fig. 5. The screws or bolts are readily removed when occasion requires separation of the casting for repairs or other purposes.

The provision of the open space below the nut in the construction shown in the pending application, as well as in this ap plication, is of great importance in case it becomes necessary to remove the bolts or screws for the purpose of repairs for the reason that the end of the screw or bolt is free from contact with the casting, and

therefore does not become. adhered thereto by reason of corrosion. Where no such space is provided it is often impossible to remove the bolt when desired without breaking it or destroying the casting or requiring drilling and tapping of the lug.

In my pending application above referred to, I have shown and described a nut inserted in the chaplet before the casting is made and thereby fused into the lug or having the top of thechaplet itself suificient-ly thick to admit of tapping a screw threaded hole therein and dispensing with the use of a. separate nut, from each of which methods the present invention is distinguished. While having all the advantages of the former it has the additional advantage that nuts of different sizes may be selected for insertion into the lugs, and the nuts may be removed at any time for replacement when needed for repairs.

W hat I claim and desire to secure by Letters Patent is:

1. The hereinbefore described process of casting metals consisting of forming a mold having a chaplet incorporated therein, said chaplet having openings on two sides, and having its upper portion filled with a core, and having a chamber located beneath the core, said mold being formed so as to permit one of said openings to be closed and the other to be partially closed with the molten metal, then pouring the molten metal into said mold and thereby filling said chamber and closing one of said openings and partially closing the other, whereby the casting is provided with a chamber closed at the bottom and with a side opening near the top adapted to receive a screw threaded nut.

2. In a metal casting a chaplet having a chamber therein and havin no opening in its bottom througa the castlng, said chaplet being adapted to receive and removably support a screw threaded nut in the upper part of said chamber.

In a metal casting a chaplet having a screw threaded nut removably located in its top, combined with a chamber located beneath the nut and having no opening in its bottom. through the casting.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses, this eighth da of August, 1922.

DOM] NICK LOltDllNO.

\Vitnesses ELMER L. BRIcos, DORA ConnINo.

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