US244443A - Michael feeeman - Google Patents

Description

(Model.) 2 Sheets-Sheet 1.

M. FREEMAN. SAND MOLD AND DLASK DoD MODDING.

N0. 244,443. Patented' July 19,1881.

(Model.)

M. FREEMAN. SAND MOLD AND FLASK FOR MOLDING. I

Patentedauly 19,1881'.

Y UNITED STATES@ PATENT OFFICE( MICHAEL FREEMAN, OF RACINE, WISCONSIN, ASSIGNOR IO STEPHEN FREEMAN St SONS, OF SAME PLAGE.

SAND MOLD AND FLASK FOR MOLDING.

SPECIFICATION forming part of Letters Patent No. 244,443, dated July 19, 1881.

n Application filed August 23,1880. (Model.)

To all whom it may concern 1 Be it known that I, MICHAEL FREEMAN, of

Racine, in the county of Racine and State of:v

against a tendency to break out in pouring.

In the art of two-part moldin gas heretofore practiced molds of the smaller dimensions have been entirely stripped when set for pouringthat is, the cope and drag ilasks have been removed before setting the mold, and the two sand parts left standing o n a board withoutv lateral support till poured. In order to give necessary strength to the mold thus made, a considerable body of sand has been required laterally outside the impression. This gave relatively great bulk to the s cveral molds, required a large space in which to setV them, and entailed expense, of course, in their production by reason of the greater amount of sand handled in the process. Y

It is the object of my invention to materially lessen the amount of sand required in this class of molding, and at the same time insure the mold againstbreakin gout in bein gpoured. As a result of my improvement, a large class of work heretofore done on the floor, by reason of the large quantity of sand used for each mold, may be done on the bench 7 and by the machine77 at the reduced cost which attends bench and vmachine work, floor-.space is economized, and a material, saving is realized by avoiding the loss which has heretofore been common from the breaking out of molds in pouring.

To these ends said yinvention consists, first, in a two-part mold?74 (bywhich is meant' a mold containing two sand parts, made respectively iu the cope and drag and divided horizontally by the parting) surrounded by a permanent drag embracing the lower sand part and a portion only ofthe upper sand part in such manner as to strengthen the mold laterally at the parting, and thereby prevent the same from breaking out in pouring. The drag is called permanent,7 because it is left on the mold nntil poured.

It consists,secondly,iu a permanent drag of cast-iron adapted and intended to remain on the mold until poured, said drag being provided with lugs cast thereon, which serve as stops to the press-board in molding-machines.

It consists, thirdly, in the combination, with the permanent drag, of a match-board or molding-board adapted to set up into the drag so as to bring the parting-line below the top of the drag.

Said invention consists, fourthly, in an adjustable notched steady-plate on. the drag, whereby said drag may be iitted to the steadypins of a cope, so that a single cope may be Y used with several drags.

It consists, nally, in an improvement in methods-of making two-part molds-namely, in locating the parting, or the whole oramain part of the impression which is to receive the metal, below the top of the drag, and leaving the drag thus'extended above the parting or impression on the mold till poured, whereby less sand is required in the mold for a given casting and the mold is strengthened against a tendency to break out at the parting when poured. By parting7 is meant the contiguous faces of the two sand parts of the completed mold external to the impression made by the pattern.

In the accompanying drawings, Figure 1 shows, in perspective, a flask consisting of an ordinary snap-cope and a cast-iron drag of the character herein described. Fig. 2 is a central vertical section of the cast-iron drag inverted on a match-board as it'is applied thereto in the first step of making the mold. Said drag is vshown filled with sand and with the pressboard pressed down to place. The match board in this figure is not in section, but inside elevation, and clearly appears as setting up into the drag for the purpose of locating the parting within the drag, as will be further explained. Fig. 3 is a central vertical section of the complete flask, composed of the drag and cope, right side up, empty, and with the press-V board in place, through the plane w Fig. 1. The horizontal dotted line indicates the location of the parting between the sand parts formed in the flask, as determined by the use of the elevated match-board shown in Fig. 2. Fig. 4 is an under-side fragmentary view of the drag and cope at one end, showing the adjustable guide-plate on the dragflange to fit the steady-pins of the cope. Fig. 5 is a ceutral vertical section7 and Fig. 6 is a perspective view, of my improved mold as it appears embraced by the drag and ready to be poured.

C represents an ordinary snapcope, having the ears E and steady-pins E', c being the latch, and la the hinge.

D is a cast-iron drag intended to be left on the mold and to form a part thereof until broken down after casting. Said drag is provided with the iiange F, preferably extending entirely around the upper margin thereof, that it may give increased strength. At the ends of the drag said flange has notches n to receive the steady-pins E on the cope C, and also the corresponding steady-pins E on the match-board. Since many drags will be used with a single match-board and a single cope in molding, by reason of the fact that a drag is left on each mold, as stated, each drag is provided at one end with an adjustable plate, d, having a notch, n, which plate is movable outward or inward between the iiangesf, to strike the steady-pin E'. This'plateis held in position by the bolt and nut t. By means of this adjusting device each ot' the several drags necessary in the practice of my invention are readily fitted to the single cope and matchboard with which they are to be used. Said drag is also provided with lugs m, preferably two on each side, terminating at a proper distance from the bottom edge, as shown, to form stops for the press-board I), as indicated in Figs. 2 and 3.

In making a two-part mold accordiu g to the method heretofore practiced the parting L between the two sand parts, though often irregular, has had its general level located in the plane of the top of the drag; and in molds of minor dimensions the entire ask-cope and drag-has been removed from the sand, leaving thelatterwithoutlateral support. Inthelarger molds the flask has been retained on the sand until poured; but said flask has been either retained as a whole-that is, both cope and dragor has been wholly removed, as stated. In molds from which the flask has been removed it has been necessary to use a considerable body of sand located laterally outside the impression, in order to give strength to the mold against a tendency to break out at the parting in being poured.

In my improved mold and method of molding the cope only is removed, and the drag is left on the mold until the latter is broken down after casting. For this purpose said drag is made deeper than it would be made for the ordinary construction of a mold for the same casting, in order that it may extend materially higher than the general level of the parting between the sand parts of the mold, and may practically embrace or hoop7 the two sand parts over the general level of the partingthat is to say, the same depth of sand being preserved in mine as in the ordinary construction below the pattern or impression, (and consequently below the parting-line of such pattern or impression,) the drag is made deep enough to rise above the general level of said parting (which, in the old method, is in the' plane of the top of the drag) and to include a substantial portion of the upper sand part of the mold. This feature of my invention is clearly shown in Fig. 5, wherein A represents the upper sand part of the mold; B, the lower sand part 5 and the drag C is shown as wholly includin g thelower part, B, and as rising above the parting L, to include the lower portion of the upper sand part, A.

In order to bring the general level of theparting in the position desired and indicated-th at is, below the top of the drag-the match-board is made to set up a suitable distance into the drag in its first or inverted position and in the initial step of forming the mold, as shown in Fig. 2. For ordinary; bench-work said matchboard may consist of the base-board b, having a frame, r, fitted to set up a proper distance into the inverted drag, and lled with sand, in which the pattern represented at a is embedded 5 or such pattern-support may consist of a board of suitable thickness,on or in which the pattern rests. The base bis provided with steady-pins E, corresponding in form and position with the steady-pins E of the cope 0, which is to take the place of the match-board after the drag part of the mold has been completed. The frame r is beveled or inclined inward as it rises from the base-board, for the obvious purpose of fitting the same to draw freely when it is lifted olf or out of the drag preparatory to applying the cope C, and also that the cope may be lifted from the drag after being lled with sand and preparatory to finally removing the pattern. The height of the frame 1^ herein represents the distance at which the parting will be located below the top of the drag in the finished mold. The sand in which the pattern is embedded in the frame r may, however, be arched upward from said frame, or it may be centrally depressed below the top of the frame. It will, as a matter of fact, often be irregular in height, according to the contour of the parting-line of thepattern; and it is not strictly necessary that the frame r be itself of uniform height, as shown. On the other hand, said frame will in many cases be of uniform height, as indicated in the drawings, and the sand contained in said frame will as often be on a level therewith. This will obviously give a parting in a. plane parallel with IIC the top ofthe drag; but belowit I have adopted the uniform height of frame 1', and have supposed the same to be evenly lled with sand, for greater clearness and convenience of illustration, and the straight dotted line L in the several iigures wherein it appears indicates the relative position of the plane parting. L similarly indicates the abrupt marginal inclines of the parting produced by the inclined faces of the frame r, for the purpose ot' insuring draft, as stated. Said lineLis, however, intended to stand for or to represent the general level of the parting, if'the latter is not in a plane, as shown 5 and the lines L the extent of depression of said general level below the top of the drag, even if, in particular cases or in parts of the same mold, the incline is not as abrupt or as near the margin as herein shown.

The steps taken andthe manipulations o f the several parts of the ask and the matchboard in the process of forming the impression from the pattern are the same in the practice of my invention as heretofore taken for this purpose. They need not, therefore, be here stated in detail.

My improvement in method relates to the steps or manipulations which follow the return of the cope, containing a part of the impression, to the drag, containing its part, after the pattern has been removed. As hereinbefore set forth, it has been customary at this stage of construction to either remove the entire ask from or to leave the entire flask on the mold. In my method I remove the cope-flask and leave the drag on the mold. The utility of this modification has reference, of course, to the location of the general level of the parting below the top of the drag, so that the improved method may be stated to consist, in the case of a two-part mold having the general level of the parting materially lower than the top of the-drag, in removing the cope-liask after the mold is finished, then setting the mold with the drag in place thereon, and finally removing the drag after the mold has been poured.

It is plain that in a mold constructed as shown much less sand need be used, and that the pattern or impression may extend laterally nearly to the drag, as shown in the drawings, without danger of breaking out at the points of such near approach. If the parting-level were in the plane of the drag-top, this would not be the case, though the drag were left in place on the mold, for then the cope-sand would give way; but when the drag rises above the parting andis left on the mold, as shown, both the cope part and the drag part of the mold are strengthened at the parting, and the rupture of either part is prevented.

I am acquainted with the use of a ring bedded in the drag part of a two-part mold for the purpose of strengthening the same; but such use of a ring is obviously not the equivalent of my construction for these reasons: rst, that it does not rise above the partingface, and does not, consequently, strengthen the cope part ofthe mold 5 and, second, that it has abody of sand laterally outside the same, to dispense with which is one of the obj ects and clear advantages of my invention. Moreover, said ring, being not of the iiask, but a separate and additional part to be handled, requires time for its adjustment and for the packing of the sand about it.

Having thus described my invention, I claim- 1. Atwo-part sand or loam mold consisting, as it stands ready to be poured, of the following parts, namely: the upper sand part, A, the lower sand part, B, and the drag-iiask D, the cope-ask being absent, and the parting between the sand parts being inclined downward from the top of the drag D, and having its general level below the top of said drag, substantially as and for the purposes set forth.

2. The cast-iron drag D, having the stoplug, m to arrest the press-board, and the adjustable plate d, whereby the drag may be readily adjusted to the steady-pins of a cope, substantially as described.

3. The method of making a two-part sand mold which consists in locating the general parting below the level of the drag-top, and after the sand parts have been finally joined removing the cope and leaving the drag remaining on the mold, to be taken oit' when the same is broken down aftercasting, asy described.

In testimony that I claim the foregoing as my invention I affix my signature in presence of two witnesses.

MICHAEL FREEMAN.

Witnesses:

J. E. DODGE, J oHN T. FISH.

IOO

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