US2218195A - Foundry flask - Google Patents

Description

H. S. GARRETT FOUNDRY FLASK Oct. 15, 1940.

INVENTOR -H.S.GARRETT Filed July 51, 1939 Patented Oct. 15, 1940 FOUNDRY FLAQSK Harold Sidney Garrett, to Wagner Electric Normandy, Mo., assignor orporation, St. Louis, Mo.,

a corporation of Delaware Application July 31, 1939, Serial No. 287,509

3 Claims.

My invention relates to a foundry flask and particularly to means for securing accurate and permanent alignment between the cope and the drag. Heretofore great difficulty has been encountered in maintaining such alignment between the parts of the flask due to the fact that such parts are made of relatively soft and light material, such as aluminum, which is subject to rapid wear from the jars to which the flask is subjected during the molding operation.

One object of my invention is to provide aligning means for the cope and drag of a foundry flask which is so constructed that it will withstand the rough usage, to which it is necessarily subjected, with but little wear.

A further object of my invention is to provide wear compensating means by which such slight wear as does occur, may be quickly and easily taken up.

In the accompanying drawing, which illustrates one form of foundry flask made in accordance with my invention, Figure 1 is a side elevation; Figure 2 is an enlarged fragmentary vertical section; Figure 3 is a section taken on the line 33 of Figure 2; Figure 4 is a section taken on the line 44 of Figure 2; and Figure 5 is a diagrammatic view.

The flask comprises a cope 6, a drag I, and a match plate 8. The match plate carries one part of a divided pattern 9 on one face .and the other part 9' on the opposite face. The cope is provided with a sand strip ID. All the above named parts may be of any usual and well known construction.

Carried on the ends of the drag are lugs H and on the ends of the cope similar lugs I2. Each of the lugs l i is provided with a tapered opening 53 for the reception of the enlarged tapered foot H! of one of the guide pins 15 and I5. The small ends of the feet [4 terminate some distance back of the faces of the lugs to permit the feet to be drawn into the lugs to take up wear. This is accomplished by means of nuts Hi engaging threaded studs ll carried by the feet. Lock washers l8 are employed to prevent accidental loosening of the nuts.

Formed in each of the lugs I2 is a tapered opening It to receive one of the tapered plugs 20 and 20'. These plugs are alike except that plug 20 has a round opening 2! to receive the round guide pin I5, and plug 20 has a slot 22 to receive the non-circular guide l5. This pin may be of any cross section which will permit of variation in its diameter by rotation. In the drawing I have shown it as hexagonal so as to provide three diameters A, B and C (Figure 5). In practice, the difference between these diameters is very slight. For example, I find that'if diameter A is .749", diameter B may be .75", and diameter C may be .751". Plugs 2i and 20' are held in the 5 lugs by nuts 23 on threaded hubs 24 carried on the plugs. Lock washers 25 are employed and the nuts 23 may be used to take up wear in the same manner as nuts i6. Guide pin I5 passes through a round hole 26 in one end of the match plate 10 and pin 25 passes through a slot 21in the other end thereof.

By making the feet l4 and plugs 20 and 20' sufl'iciently large in diameter, it is possible to reduce the wear between these parts and the lugs 15 I i and I2 to a minimum notwithstanding the relatively soft material of which the latter is made and the rough usage to which the device is subjected. I have found in practice that the largest diameter of the foot l4 should be at least .15 times the effective length of the pin and that the length of the foot should be at least one-half of its diameter. The plugs 20 and 20' should be at least as large as the feet M. I make both the guide pins, including their feet and the plugs, of 25 hardened steel and chrome plate the pins to provide a very hard and durable surface.

While I have shown my flask used with a match plate carrying both parts of the divided pattern, it will be understood that it may be used in connection with two match plates each carrying one part of the pattern.

' It will'be seen that this construction provides rigid and aligning means which is liable to but little wear. Further, such slight wear as may occur, may be easily taken up. Any wear between the feet and the lugs, or between the plugs and the lugs, may be taken up by tightening nuts i5 and 23. Any wear in the slot 22 may be compensatedfor by turning the pins l5 through the 40 proper angle to bring a larger diameter into effective position. i

Having fully described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. A foundry flask comprising a cope and drag, a guide pin carried by one of said parts, said guide pin having an enlarged tapered foot entering a tapered opening in said part, a threaded stud on the end of the foot opposite the pin, a nut on said 5 stud for drawing said foot into said opening to anchor the pin and take up wear, a tapered plug carried by the other part, said plug entering atapered opening in said latter named part, and means for drawing said plug into its opening to anchor the plugs and take up wear, one of said plugs being provided with a slot engaging one of the pins.

3. A construction containing the elements combined as defined in claim 2 in which the guide pin engaging the slot in one of the plugs is polygonal in cross section, the polygon comprising two or more sets of opposing faces providing differing diameters whereby wear may be compensated by rotation of the pin.

HAROLD SIDNEY GARRETT.

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