US1697135A - nuttall - Google Patents

Description

P. A. NUTTALL SAND RETAINING BAR FOR FOUNDRY FLASKS Filed Feb. 4, 1927 2 Sheets-Sheet '1 mom,

Jan. 1,1929. 1,697,135

P. A. NUTTALL SAND RETAINING BAR FOR FOUNDRY FLASKS Filed Feb. 4. 1927 2 Sheets-Sheet 2 III gwuentoz Patented Jan. 1, 1929.

PATENT OFFICE.

UNITED STATES PARK A. NUTTALL, 0F YOUNGSTOWN, OHIO, ASSIGNOR TO TRUSCON STEEL COMPANY, OF YOUNGSTOWN, OHIO, A CORPORATION OF MICHIGAN.

SAND-RETAINING BAR FOR FOUNDRY FLASKS.

Application filed February 4, 1927. Serial No. 165,966.

This invention relates to an improved foundry accessory, and more particularly to a novel sand retaining bar for foundry flasks.

To that end the invention contemplates a bar or strip of metal having special features and characteristics for retaining or holding the sand in the flask during the handling thereof in carrying out the molding operations. \Vhile it has been heretofore the common practice to use plain bars or strips for this purpose, and in some cases to use bars having portions formed to provide sand engaging shoulders; or to use perforated bars for receiving nails, pins or the like which are embedded in the sand, nevertheless, it is desirable to provide a bar which not only possesses structural features which effectu: ally hold the sand, throughout the length of the flask, but which also provides a point of fastening .for the interior or cross bars of the flask.

Accordingly, a more specific object of the invention is to provide a main or primary sand retaining bar having a portion thereof corrugated in such a way that all of the sand substantially above half the depth of the cope or part of the flask in which the bar is used, is held in such a way that it will not drop out when the flask is lifted. That is to say, the present invention contemplates a bar having portions which present relatively opposite inclined walls at one edge thereof and which cooperate with the inclined sides of the mold part in such a way that the body of the sand between said part and the bar is engaged by oppositely inclined convergently related walls.

l/Vith the above and other objects in view which will more readily appear as the nature of the invention is better understood, the same consists in the novel construction, combination and arrangement of parts hereinafter more fully described, illustrated and claimed.

A preferred and practical embodiment of the invention is shown in the accompanying drawings in which Figure 1 is a top plan view of a foundry flask having the improved sand retaining bar therein.

Figure 2 is a side elevation partly in section illustrating the present improvements.

Figure 3 is an enlarged detailperspective view of a portion of the improved sand retaining bar.

with the cope F of a foundry flask, the same including a rectangular cope having the opposite side walls 1 and the end walls 2, the stud walls belng bowed or bent outwardly at their medial portions to provide the divergent portions 02 and 1 thereby to provide a side retaining groove 2 at the inside of the frame.

The sand retaining bar constituting the present invention is designated generally as A and is intended to be placed in the flask, longitudinally, between the opposite side walls 11 of the cope so that the ends thereof may be anchored in any suitable manner, as by welding to the end walls 22. The said bar A preferably consists of a body portion of suitable length and width, sub stantially one-half of the width thereof being of plain formation while the opposite half is corrugated to provide oppositely inclined and oppositely disposed smooth sandkeying shoulders 4 and 5. This arrangement provides one side of the bar with a plain edge 6, while the opposite edge is of sinuous formation as clearly shown in Figures 1 and 3. The shoulders i and 5, as previously indicated are formed at opposite faces of the body of the bar thereby to provide a multiplicity of keying elements along one edge and at opposite faces of the bar. It will also be observed that each shoulder is inclined with respect to the flat portion 3 of the bar so that an over-hanging effect is produced by the shoulders with reference to the flat portion of the bar whereby the shoulders cooperate with the inclined faces 02 of the cope to provide apocket or restricted facing for retaining the sand in place.

The said retaining bar A also constitutes a retaining means for the interior bars B which are arranged in spaced relation between the sides 11 of the cope and the bar A to assist in holding the sand. The bars 13 may be secured in position, that is, to the sides of the cope and the bar A, by welding or otherwise and not-only serve to strengthen and rein-- force the cope but also greatly assist in retaining the sand during the handling of the mold. This is a partlcularly advantageous feature since in large flasks, the pressure on.

the sand duringthe pounding and casting operation is likely to distort or bend the sidesof the cope, but this action is effectually resisted by the present arrangement. The disposition of the main retaining bar with its corrilgat'ed edge and the interior bars B also serves to prevent the sand in the cop-e portion of the flask from sinking down, when the same turned on end to receive the molten metal, thereby insuring proper registration of the two' halves of the mold.

From the foregoing, it will be apparent that the present invention provides a simple and practical retaining bar which not only possesses the necessary structural. features to retainthe sand from slipping out of the flask when lifted around, but also' m'akes it easy to knock thesand out when it is desired to do so. Furthermore, this arrangement avoids the useof a ba -r having openings or struck-out portions of metal which present rough or sharp edges likely to injure the hands of the workmen in handling the same, and also cause 7 too mu'ch sand adherence when the mold-is to be cleared.

Without further descripiton it is thought that; the: features and advantagesof the invention will be readily apparent to those skilled in the art, and it will of course be understood that changes in the form proportion and minordetails of construction may be resortedito, without departing from the spirit signature.

2. A sand retaining bar for foundry flasks comprising a metallic body having a flat portion and a continuous corrugated sand holdmg portion ad on'nng the sai'ne' and extending from the medial p'or tion to the edge of the bar thereby providing plurality of connected oppositely inclined sand holding shoulders, and means for connecting -theends of the bar to the body of the flask.

'3; A sand retaining bar forfoundry flasks: comprising a metallic strip-like-body having a flat portion and being corrugated from one edge toward said flat portion thereby to provide a plurality of smooth alternately in clined integrally connected sand keying shoulders arranged at oppositesidesof the plane of the flat portion ofthe body and forming a continuous sand keying edge adapted to be located in the plane of the, edge oftheflask, and a Weld connecting opposite ends of the-bar to'the body of the'i'laslrn In testimony whereof I" hereunto afliX my PARK A. N T'rALn

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