US1137851A - Removable molding-flask bar. - Google Patents

Description

D. M. FAHNESTOCKQ REMOVABLE MOLDING FLASK BAR.

APPLICATION FILED NOV. 7, I913.

Patented May 4, 1915.

FIG.1

FIG 2 FIG.3

Q INVENTO R\ WWW THF NORRIS PETERS C0,. FHOTO-LITHO., WASHINGTON. D. C.

DAVID M. FAHNESTOGK, OF PITTSBURGH, PENNSYLVANIA.

' REMOVABLE MOLDING-FLASK BAR.

Specification of Letters Patent.

Patented May a, 1915.

Application filed November 7, 1913. Serial No. 799,680.

To all whom it may concern Be it known that 1, DAVID M. FAHNns'rooK, a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Removable Molding-Flask Bars, of which the following is a specification.

This invention relates to sand-molding flasks, and more particularly to bars for bridging or anchoring the sand in the cope of the flask to more securely hold the sand during the operations of molding and handling the cope.

It has been the practice in foundries to place in the copes ofmolding flasks wooden or iron bars for the purpose of anchoring and holding the sand therein during molding and handling. The disadvantages of the wooden bars are. that they rapidly char and become useless from the heat, and being nailed in place, are not readily removable, or movable from one position to another. When it becomes necessary to remove such bars, or change their positions, the flask walls necessarily become weakened by the withdrawal of nails and the repeated driving and removing of nails soon renders the flask worthless. Moreover, the services of a carpenter are necessary to carry out these operations. Further, in order to prevent such wooden bars from becoming almost immediately worthless by charring it is necessary to have them spaced rather. far from the mold cavity, thus preventing an effective anchoring of the sand, in the cope. Metal bars have also been used, and these have been secured in position byv bolting the same to the side walls of the flask. The bolt holes weaken the side Walls, and to move the bars from one position to another requires the boring of newholes, which still further weakens the flask, and also requires the services of a carpenter. Furthermore, after such bolted bars have been'in the flask for some time the bolts are rusted orburned so firmly into the wood that they have to be cut out at a very considerable expenditure of time and alsodanger of damaging the flask walls.

The object of this invention is to provide a bar for usein molding flasks which will anchor the sand securely in place, which is 'not subject to destruction by charring, and

which has fastening means such that the bar is readily removable from the flask and adjustable in the flask.

In the accompanying drawings Figure 1 is a diagrammatic plan view showing the cope of a wooden flask with a number of the improved bars applied thereto; Fig. 2 is a vertical sectional view through the cope of a flask showing one of the dividing bars in side elevation; Fig. 3 is a top plan view of one of the bars on an enlarged scale; and Fig.4: is a vertical section through a bar showing modified means for anchoring the sand thereto.

The bar 1 is provided with a thin body portion 4 which extends part way into the cope, allowing room for patterns of moderate size to be placed in the flask under the bars. The bar is provided with suitable means for anchoring the sand against displacement and in preventing distortion of the mold cavities during pouring. Such anchoring means may be of various kinds, either depressions in or projections on the surface of said bar. Fig. 2 shows for this purpose a series of perforations 6 extending entirely through the body of the bar, while Fig. 4: shows the bar provided with a series of projections 7, which may be in the form of ribs extending continuously or inter ruptedly from end to end of the bar or for any desired portion of thelength of the bar.

Preferably, the bar is also provided at its lower edge with an enlargement 5, preferably beveled, which serves asan additional anchor for the sand as well as to strengthen the bar.

The means for securing the bar to the flaskare shown as follows: The upper edge of the bar at each end is provided with an extension 8 adapted to extend over the top edge of the flask wall, and outside of the same is provided with a downward projection9 forming a sort of hook taking over the top edge of the flask. is preferably spread or widened out, as illustrated, and is provided with an opening 10 adapted to have a wedge 11 driven therethrough and between the outer depending portion 9 of the bar and the outer face of the flask wall, thereby wedging the bar The extension 8 i wedges 11 are driven into place.

In use thebar is placed in the flaskwith its body projecting down into the cope and the hooked end portions 8 restingover the top edges of the cope sides. If it is then necessary to change the position of the bar,

due to a high pattern with which it would interfere or because it is needed for use in another flask, it can be readily removed simply driving out the Wedges and lifting it off. When again placed in position the wedges 11 are simply driven into place and securely hold the bar in position during the packing of the sand around the pattern and the subsequent handling ofthe flask and pouring of the mold. It is apparent that the bars can thus be very readily changed from one position to another and also removed from'the flask.

These bars may be formed of any suitable metal, either, steel, iron, brass, bronze, or any suitable alloy, but for reasons of economy in cost and in durability, will be formed either of steel or iron. They also are preferably formed by casting, although they may be formed by forging, or by pressing or otherwise suitably constructing the same from plate metal. These bars are very durable, are not likely to be injured or destroyed as are wooden bars by the act of fastening them in or removing them from the flask, canbe quickly and easily changed from one position to another by any ordinary laborer, and; the fastening means is such as not to weaken the flask walls. They. also are not injured by the heat of the molten metal, and consequentlv only suflicient sand need be provided between the edge of the mold cavity and the bridging bar to prevent the casting from chilling. Asa result a larger number of bars may be put into a flask for castings of'the same kindthan ispossible with wooden partitions, and therefore the sand bars aroused, and since they are readily removable their position can be easily changed to'allow space for patterns of peculiar size. The disadvantages of Wooden bars are also true of the metal bars heretofore in use in so far as concerns their removal to accommodate specially shaped patterns, since from the diflicultyof their removal it has not been customary to place them as closely together as can be done with the improved bar, and therefore it has not been possible to bridge the sand as'securely in the cope. The improved bars, because of the method of fastening employed, also brace the flask and render it less liable to injury from handling.

Various modifications in the size, form and construction of the bar and the means for securing it to the flask will readily occur to those skilled in the art.

It will be understood that no limitations are to be imposed upon the terms of the claims hereinafter made either by the spe cific illustration in the drawings or the specific description in the specification.

What I claim is:

1. A metallic flask bar or plate for a molding flask, having-a body adapted to project into the flaskand having at the upper edges of its ends portions adapted to project over and beyond the side edges of the flask, and means acting between said projecting portions and the sides of the flask for securing the bar to the flask.

2. A metallic flask bar or plate for a molding flask, having a body portion adapted to project into the flask-and having at its upper edge at both-ends a portion extending over the side of the flask and provided with an opening therethrough, and wedges adapted to be driven through said openings andbear against the outer side faces of the flask.

3. A metallic flask bar or plate for a molding flask, having a body portion arranged to project into the flask and having at its upper edge at'an end a portion extending over the side of theiflask and provided with an opening therethrough, and a wedge adapted to be driven through said opening and bear against the outer side face of the flask, the end edges of the body of said bar adjacent said extending portion being provided with projections adapted to engage the inner face of the flask.

4. A'metallic flask bar or plate for a molding flask provided with a body adapted to wardly outside the same, the ends of said body being provided with teeth or projections, and securing means engaging the overhanging edge portions of the bar and the flask walls and, arranged to-force the latter inwardly against said teeth. I, V

5. A metallic flask bar or plate for a molding flask comprising a body adapted to proj ect intothe flask and provided with anchoring means, said body having at its ends portions extending beyond the side edges of the flask, said projecting portions being cut away to admit of the insertion of securing means for securing the bar to the flask.

6. A metallic sand bridging bar for a molding flask, comprising a body member adapted 'to extend into the flask and provided at both ends with wedging meansacting between the flash walls and projecting portions of the bar for detachably securing the same to the flask walls, said means act ing inwardly against the outer surfaces of the flask walls and tending to prevent lateral spreading of the walls.

7. A metallic partition or dividing bar or plate for a molding fiask, having a thin body portion arranged to project into the flask, said body portion being provided with perforations and an enlargement extending along its lower edge for anchoring the sand and having at its upper edge at both ends projections extending over the side walls of the flask and provided with openings therethrough, and wedges adapted to be driven through said openings and bear against the outer faces of the flask.

8. A metallic flask bar or plate for a molding flask, having a body provided with an enlargement extending along its lower edge,

' said body being adapted to project into the DAVID M. FAHNESTOGK.

Witnesses F. W. WINTER, WILLIAM B. WHARTON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, I). G.

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