US1364207A - Mold-flask - Google Patents

Description

l. REED.

MOLD FLASK.

APPUcATloN Flu-:n JULY x9. 1920.

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MOLD-FLASH.

Application filed July 19, 1920.

To all whom t may concern:

Be it known that I, JOHN C. Rani), a. resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented new and useful Improvements in Mold-Flasks, of which the following is a specification. Y

The'invention relates to the construction of flasks for forming green sand molds having sand depending below the parting of the cope and drag. l/Vhile the invention is unlimited to flasks for forming molds for any specific articles, it is particularly applicable to flasks for making molds for casting bath tubs of the usual well-known form having roll rims, and it is with par ticular reference to such flasks that the invention will be described.

The object of the invention is to provide a flask in which dependent sand may be adequately supported without the use of gaggers, or similar devices, now employed for this purpose.

The invention is illustrated in the accompanying drawings, in which Figure 1 is a plan View of a flask for forming molds for casting bath tubs, and Fig. 2 a vertical sectional view taken on the line II II, Fig. l.

In large foundries where many thousand bath tubs of the same general shape and dimensions are cast, the flasks are constructed of cast iron and of shapes particularly suitable for the intended purpose. The flask for this purpose may be made in two parts, a cope, and drag, the cope including the portion of an ordinary three or more part ilask usually designated as the cheek, and throughout this specification and the appended claims the term cope is used to include the cheek, whether the cheek is made a part of or independent, of the cope.

In the drawings the drag is indicated at l and the cope at 2, and between them there is shown the section of a bath tub 3 which may be considered as a cast tub or as the mold space into which molten iron is poured to form the casting. The parting, or horizontal plane of division between the cope and drag, is indicated at 4, and as is the usual practice the parting is in the plane of the lower edge of the roll rim 5. The cope is provided with a plurality of suitably spaced vertical ribs 6 for supporting the sand, such ribs having tapered edges Specification of Letters Patent.

Patented Jan. 4, 1921.

Serial No. 397,449.

adjacent 'to the face Aof the mold cavity or tub 3.

ln the heretofore prevailing methods of compacting sand in flasks by means of hand tools, pneumatic rammers, and the like, considerable space must be ileft between the lower edges of the ribs 6 and the face of the pattern in order to properly compactethe sand beneath the ribs. To adequately support the sand depending below the ribs and into the concavity for forming the lower face of the rim 5, gaggers, dutchmen and like devices are placed by hand in the dependent sand. Not only does the placing ofgaggers and the like require considerable time, but their presence in the sand after the mold has been shaken out is a source of considerable annoyance and diliiculty. At the present time, however, molds are formed byV mechanically projecting sand at a high velocity into the flasks, the sand becoming compacted by reason of its velocity, and, chiefly because so little time is required to so form a mold, gaggers may not advan-I tageously be placed in the dependent sand below the lower edges of the ribs.

According to the present invention, the dependent sand is supported by continuing the ribs 6 below the parting, as particularly indicated at 7. The tapered edges of the ribs may extend very close to the face of the pattern and conform to its contour in the concave lower face of the rim 5. By so forming and properly spacing the ribs, the use of gaggers, and the like, may be eliminated and the time required for formation of a mold may be correspondingly shortcned. T o support the sand between the ribs, laterally-projecting lugs 8 may be formed integrally with the ribs at their lower ends, such lugs preferably having tapered edges. Cast iron flasks of the character shown herein are so heavy that they are necessarily handled with cranes. They are placed on the floor and on other supports in various positions and are necessarily subject to considerable jar -and rough usage. To protect the portion 7 of the drag ribs 6 which extend below the parting from becoming broken 0H or otherwise injured, the cope is provided with a flange 9 extending downwardly from the lower outer edge thereof and terminating in a plane below the lower edges of the ribs. Thus when the cope is placed upon a oor it will be supported by the lower edge of the flange 9, rather than by the thin edges of the ribs 6. The iange 9 may be continuous, as indicated in the drawings, or may be otherwise formed to afford a support for the cope, the plane of which support will be below the lower edges of the ribs.

I claim:

l. A flask for forming green sand molds, comprising a 'cope and a drag having a horizontal parting, the cope being provided with vertical ribs having their lower edges projecting below the parting to support dependent sand, and a liange extending downwardly from the lower outer edge of the cope and terminating in a plane below said lower edges of said ribs.

2. cast metal lia-sk for forming green sand molds for casting roll rimmed bath tubs, comprising a cope and a drag having a horizontal parting, the cope being provided with Vertical ribs having their lower edges projecting below the parting to support dependent sand, said ribs being provided with laterally projecting lugs at their lower ends formed integrally with the ribs, and a iange extending downwardly from the lower outer edge olf' the cope and terminating in a plane below said lower edges of said ribs.

3. A flask for forming green sand molds for casting roll rimmed bath tubs, comprising a cope and a drag having a horizontal parting in the plane of the lower edge of the bath tub rim, the cope being provided with vertical ribs having their lower edges projecting below the parting to support dependent sand in the ooncavity of the rim, and a ange extending downwardly from the lower outer edge of the cope and terf minating in a plane below said lower edges of said ribs.

In testimony whereof I have hereunto set by hand.

J OI-IN C. REED.

Witnesses:

G. G. TBILL, PAUL N. CRIToHLow.

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