US1846028A - Molding device - Google Patents

Description

Feb 23, 19.32. T. J. EVANS ET AL I 1,846,028

MOLDI NG DEVICE Filed Jan. 29, 1931 3 Sheets-Sheet 1 i Exams J9 Thomas JZm/w Feb. 23, 1932. J/EVANS ET AL 1,846,028

MOLDING 'DEVICE Filed Jan. 29. 1931 3 Sheets-Sheet 2 Feb 23, 1932. T. .J. EVANS ET AL MOLDING DEVICE Filed Jan. 29, 1931 3 Sheets-Sheet 3 flahozdlmms v A t 0 my W////// 7/ /4 M m v ////////w Patented Feb. 23, 1932 UNITED STATES PATENT OFFICE THDIIAS 3'. EVANS AND HAROLD; EVANS, F BLUE ISLAND, ILLINOIS MOLDING DEVICE 'Application filed January 29, 1931.

The invention relates to molds for use in the foundry art, its objects being to simplify, expedite and reduce the cost of molding operations; and it consists of a permanent flask element, preferably of metal, a plurality of laterally interlocking solid elements, of refractory material, seated within the flask and collectively lining the side walls thereof and forming the exterior walls of the moldn ing chamber, and top and bottom elements of similar material defining the upper and lower ends of such chamber.

While the device may take various forms, one enemplification of it is hereinafter described and is illustrated in the accompanymg drawings, in which ig. 1 is a plan view of the flask element;

Figs. 2 and 3 are sectional views on the lines 2-2 and 3-3, respectively, of Fig. 1, the cope element being added;

Fig. i is a sectional view on the line 4--4: of Fig. 3; and

Fig. 5 shows in perspective, in one instance partly in section, the various elements of the device disassembled.

The specific device selected as a typical embodiment of the invention is designed for the production of a chambered follower constituting an element of a well known draft gear for railway cars.

The flask element 10 is preferably of metal and takes the form of a box having a bottom and an open top, its side walls being slightly flaring to facilitate the discharge by dumping of its contents, upon the completion of the molding operation,- trunnions 11, 11, be-

ing preferably formed on two of its side walls to provide for the convenient transporting of the flask, as by an air hoist, and its over- 10 turning for dumping.

The molding chamber 12 is exteriorly defined by, and its walls consist of, a plurality of mating plates of granular material, usually formed of sand and a bonding material and baked. One such element may be seated Serial No. 511,993.

upon the bottom of the flask, another constituting the cope and being applied to its top. The side walls of the flask may be provided with pockets, as 13, 14, 15 and 16, open at the top, into which elements, as 17, 18, which form a lining for the flask and the side walls of the molding chamber, are entered, these pockets being preferably tapered downwardly to facilitate the insertion and removal of the plates.

Preferably these pockets, or some of them, are transversely in dove-tail form, in order to retain the plate elements in position. shown, this configuration is given to the pocka ets 13 and 15, the pockets 14 and 16 having parallel side walls.

The several plate elements are of greater thickness than the depth of the pockets within which they seat and contiguous elements interlock, certain of them, as 18, 18, being rabbeted along their side margins, the elements 17, 17, fitting within these rabbets.

As plainly shown in Fig. 4:,the elements 17, 17 are retained in place by reason of the inward converging of the side walls of the pockets within which they are entered, the sides of these elements being correspondingly inclined; and the elements 18, 18 are secured within their pockets by the engagement of adjacent elements with their rabbeted side margins.

The bottom of the flask is protected from the heat by a plate 19 resting thereon and interfltting between the lower end portions of the elements 17 18. As the structure chosen to illustrate the invention is intended to produce a hollow casting, a core element 22 is employed to formthe inner and upper walls of the molding chamber and rests upon the plate 19, with which it is preferably integral.

The end of the casting is to be hollow, its chamber being crossed by ribs. For the purpose of producing this chambered end a core element 23, having the general form of a grid, is placed above the central core 22, be-

; consequently there is a ing spaced therefrom and from the cope 20. The ends of this grid are of the same contour and size as the ends of the elements 18 upon which they rest, and consequently interlock with the elements 17. The casting being desirably formed with a central hole in 1ts closed end, a coreelement 24, in the form of a pin or plug, is set throu h a suitable aperture in the element 23 an fitted within a recess in the end of the element 22, its length being such that it makes contact with the cope 20.

A suitable pouring gate is provided. Preferably one wall of the flask is provided with an external boss 25, within which is formed a pocket opening throughthe upper margin of the wall for receiving a refractory block 26, perforated, as shown at 27, 28, one end of the perforation opening through the upper, end

of the block and the other end through its inner side wall, which fits snugly against one of the side cores, as 17, which is apert-ured, as

shown at 29, to register with the opening 28, thus forming a sprue. The cope is provided with an aperture 30, registering with the opening 27 in the block 26. The molten metal poured in at 30 reaches the molding chamber 12 through the sprue apertures 29.

The various lining elements are fitted together with nicety to prevent the formation of fins on the casting, and, if desired, the

' joints may be luted.

By means of the device as described no sand is used in the formation of the mold, and eat saving of labor and time, the preparation of the mold for each casting operation is quickly accomplished and without requiring the employment 0 skilled workmen.

The flask may be made of any size or form suitable to the work in hand, it being essential only, that it be capable of receiving and properly positioning a plurality of elements of suitable form to provide the necessary molding chamber.

We claim as our invention 1. In a molding device, in combination, a flask having vertical pockets in its side walls,

I and refractory elements engageable with the pockets, a refractory lining for the bottom of the flask, and a refractory cope covering the flask, the named refractory elements forming the molding chamber.

2. In amolding device, in combination, a flask having vertical pockets in its side walls, certain of such pockets being of dove tail form in cross section, refractory elements engageable with the pockets and collectively forming the side walls of the molding chamber, a refractory lining for the bottom of the flask, and a cope covering the chamber, the named refractory elements forming the molding chamber. V

3. In a molding device, in combination, a

flask having vertical pockets in its side walls,

relatively interlocking refractory elements engageable with the pockets and collectlvely forming the side walls of the molding chamber, a refractory lining for the bottom of the flask, and a 'cope covering the chamber.

' 4. In a moldin device, in combination, a unitary metallic ask having side walls and a bottom, a plurality of interlocking elements of refractory material seated against the side walls of the flask, elements of like character at the bottom and top of the flask, the named elements constituting the Walls of the molding chamber.

5. In a molding device, in combination, a metallic flask having side walls and a bottom, a plurality of interlocking elements of refractory material seated against the side walls of the flask, elements of like character at the bottom and top of the flask, the named elements constituting the walls of the molding chamber, and an internal core element supported by and seated upon the bottom refractory element.

6. In a molding device, in combination, a unitary metallic flask having side walls and a bottom, a plurality of interlocking elements of refractory material seated against the side walls of the flask, elements of like character at the bottom and top of the flask, the named elements constituting the walls of the molding chamber, and a block formed of core material and seated in an alcove in a side wall of the flask and having a pouring gate opening communication with the molding chamber through one of its side walls.

7. In a molding device, in combination, a metallic flask having side walls and a bottom, the inner face of one of its walls having a vertical pocket, the side walls of which are of dove-tail form, and liner elements of refractory material adapted to seat against the flask walls and to mutually interlock one of the elements fitting within the named pocket, and

elements of like character for covering the bottom and top of the flask, such refractory elements being configured to collectively define the exterior of the molding chamber.

8. In a molding device, a casing rectangular in cross section and having a bottom wall, a the side walls of the casing being vertically recessed, the side marginal walls of one of such recesses being of dove-tail form, a plate of the casing, plates of refractory material seated Within the recesses in the side walls of the casing, the margins of adjacent plates haying rabbeted engagement and a plate of refractory material covering the upper end of the casing.

10. In a molding device, in combination, a flask having side and bottom walls, plates of refractory material seated against the side 1W Walls adjacent plates being interlocked, a lining of refractory material for the bottom of the flask, and a refractory cope covering the flask, the named refractory elements collectively forming the molding chamber.

In testimony whereof we aflix our signatures.

THOMAS J. EVANS. HAROLD EVANS.

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