US1883963A - Molder's flask - Google Patents

Description

Oct. 25, 1932. G' KRAMER 1,883,963

MOLDER S FLASK Filed Oct. 1, 1929 4 Sheets-Sheet l IIIIIIII 1 "mm "nu-"u...

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MQLDER'S FLASK Filed Oct. 1, 1929 4 Sheets-Sheef 2 G. H. KRAMER 1,883,963

' MOLDERS FLASK Filed Oct. 1. 1925 4 Sheets-Sheet 5 Oct. 25, 1932.

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Patented Oct. 25, 1932 UNITED STATES PATENT OFFIQE GEORGE HENRY KRAMER, OF DAYTON, OHIO, ASSIGNOR, TO KRAMER- BROTHERS FOUNDRY COMPANY, OF DAYTON, OHIO, A CORPORATION 03. OHIO MOLDER S FLASK Application filed October 1, 1929.

This invention relates to foundry practice and more particularly to a molders flask embodying interchangeable and relatively adjustable sand anchor or lifting bars and detachable trunnions.

The wooden foundry flask commonly used is provided at spaced intervals with transverse wooden bars particularly in the cope and cheek sections. Some of these wooden anchor bars extend entirely across the flask, while others are comparatively short, projecting inwardly from the sides of the flask and terminating in spaced relation therewith. WVhen a molder finds that the wooden bars in the flask section to be used interfere with the pattern to be embedded in the sand, he chops away more or less of the anchor bars or knocks the bar loose from the flask and removes it entirely. The frequent removal and replacement of such bars which are nailed to the flask walls causes injury to the flask and rapidly renders it unfit for use. Such practice further necessitates the employment of a millwright for the repair of flasks and replacement of multilated and removed bars. For the purpose of affording secure anchorage engagement for the sand mold, numerous nails are driven into such anchor bars, particularly into the lower margin and are bent in various directions. Not infrequently these nails cause painful injury to the molders fingers when tucking sand beneath the anchor bars preparatory to ramming up a mold.

In the present invention there is contemplated the use of cast metal sand anchor or lifting bars with coupling means by which the bars may be interengaged with the flask at any desired point. The metallic anchor bars are of various shapes and sizes so that the molder by selection may assemble such anchor bars within. the flask in any desired relation with the pattern to be embedded. As will be later pointed out and as shown in the drawings, some of these anchor bars are strai ht, extending across the flask, while others are comparatively short forming wings projecting inwardly from one side or another of a flask, while still other anchor members are of circular or rectangular form.

Serial No. 396,575.

lVith a variety of such anchor bars or lifting members to select from, a flask may be accurately accommodated to patterns of various irregular shapes, which is substantially impossible with the usual molders flask having permanently secured anchor bars.

Moreover, the use of the rectangular or circular sand supporting element serves to confine the sand of the mold about the pattern in instances where the casting to be produced has some large open area, and obviates the necessity for filling such open area with molding sand. This not only affords a saving in sand but also in the labor and time necessary to ram sand over such large area in preparing the mold.

Flasks of large size are ordinarily picked up by an overhead crane or other lifting device for movement about a molding floor and for reversal during the preparation of the mold. To this end, flasks are ordinarily provided with lateral trunnions about which they may be turned when elevated off the molding floor. The flasks containing completed molds are set side by side upon the floor preparatory to pouring the molten metal. To save space it is desirable that the flasks be set closely together. However, the lateral trunnions ordinarily interfere with the close spacing of the flasks. The present flask is provided with detachable trunnions which are removab-ly engaged in sockets carried by the side walls of the flask, the removal of which permits the flasks to be located quite closely together.

The object of the invention is to improve the structure as well as the means and mode of operation of molders flasks whereby they will'not only be cheapened in construction, but will be more eflicient in use, more convenient, easily adaptable to patterns of different shapes and proportions, of greater durability, and unlikely to get out of repair.

A further object of the invention. is to provide an improved form of interchangeable and relatively adjustable anchor bars or lifting bars for molders flasks and to provide improved means for detachably connecting such bars in various relative positions.

A further object of the invention is to provide improved mounting means for sand anchor or lifting bars for molders flasks whereby the bars may be adjusted longitudinally of the flask and fixedly engaged 111 any position of such adjustment.

A further and important object of the invention is to provide means for confining the sand of molds for castings having large open areas wh reby such molds may be made with minimum quantity of sand and minimum labor effort.

A further object of the invention is to provide improved venting means for molders flasks and to further provide an improved form of run-out strip for such flasks.

further object of the invention is to provide an improved trunnion and mounting therefor from which the trunnion is detachable.

With the above primary and other incidental objects in view, as will more fully appear in the specification, the invention consists of the features of construction, the parts and combination thereof and the mode of operation on their equivalents as hereinafter described and set forth in the claims.

Referring to the accompanying drawings wherein is sh own the preferred but obviously not necessarily the only form of embodiment of the invention, Fig. 1 is a perspective view of section of a molders flask to which the present invention has been applied.

Fig. 2 is an enlarged detail sectional View illustrating the method of detachably coupling the different forms of anchor bars with he flask wall.

Fig. 3 is a perspective view of a section of a molders flask, showing therein a circular anchor or lifting element and further illustrating a modified means for coupling such anchor element with the side wall of the flask.

Fig. 4t is a vertical sectional view of a mold formed within a flask employing the present anchor or lifting bars.

F 5 is a top plan view of the flask with the pattern located therein, illustrating an assembly of anchor or lifting bars of various shapes.

Fig. (3 is a perspective View partly broken away of a sand mold for casting a rectangular frame having a large central open area.

Fig. 7 is an enlarged detail sectional view of the coupling means illustrated in Fig. 3.

Figure 8 is a vertical section showing an extreme adjustment of the anchor member shown in Figure 3.

Figure 9 is a plan View of the corner plate and anchoring arrangement partially shown in Figure 3.

Figure 10 is an enlarged perspective of a corner plate.

Like parts are indicated by similar characters of reference throughout the several views.

Referring to the accompanying drawings, 1 indicates the cope or top section of an ordinary molders flask and comprises a rectangular bottomless box-like enclosure of wooden planks within which a body of molding sand is to be tamped about a pattern to form a mold. Such bodies of sand forming the mold, when of large size, are not self-supporting, and when the flask is lifted such body of sand is likely to fall out if not provided with suitable anchorage. The ordinary practice is to provide wooden slats or bars at spaced intervals to afford the necessary anchorage and support for the body of sand. However, as before pointed out, such flasks with permanently located anchor bars require frequent revision and change by cutting away or rcmoval of such bars to accommodate the flask to patterns of different shapes and dimensions. In the present instance, in lieu of such permanently fixed anchor or lifting bars, interchangeable and relatively adjustable bars are provided. These anchor or lifting bars may be formed in a very wide variety of shapes and sizes, a comparatively few of which have been illustrated in the drawings. One of the most commonly used form of bars is that illustrated at 2, which comprises a frame-like body having at its top margin laterally projecting flanges 3, and at its lower margin triangular ribs l. The marginal ribs 4 are preferably indented or roughened as at 5 to afford increased anchorage engagement of the compacted or tampcd body of sand forming the mold. Such bars 2 are provided with openings 6 through which the compressed body of mold sand extends into continuity with the portion of the body beyond the anchor bar. At their opposite ends, the bars 2 are provided with ex end-ed arms 7, which overhang the side planks of the flask. Such arms 7 may be formed integral with the anchor bars 2 or may be independently formed from wrought iron or steel and riveted, welded or bolted to the body of the bar Such anchor bars 2 may be of various shapes and dimensions. Some of these bars extend approximately from one side wall to the other of the flask 1 and also approximately from the top to the bottom of such flask section. Other bars of similar design may be differently proportioned so that they terminate in widely spaced relation with one wall or the other of the flash, or perhaps such bars may, for special requirements, be positioned medially of the flask with an intervening space to accommodate a portion of the pattern intermediate the end of the bar and the flask wall. In any event, the arms 7 of such bars are of suflicient length to overhang the side walls of the flask as is illustrated in the drawings. Other bars may be of greater or less vertical dimension. As another variation, such bars are sometimes wide at one end, and comparatively narrow at the other, thus forming a triangular or wedge-shaped bar, which will more readily conform to a Fig. 1.

' KT anchor bar cannot be employed.

pattern of inclined shape. There is shown at 8 in Fig. 1, a still further variation wherein the bar 2 is wide at its ends but narrow throughout the medial portion, thus forming an indented or recessed lower margin adapted to straddle a projection upon the pattern to be embedded in the sand mold. As illustrated in Figs. 1 and 2, brackets 9 are secured to the interior of the side walls of a flask, having downturned or hook-shaped fingers beneath which is engaged a longitudinally disposed anchor rod 10. A rod 10 extends substantially the full length of the flask on each side. Clevises 11 straddle the supporting arms 7 of the anchor bars 2 with their hook-shaped extremities engaging beneath the rod 10. In order to fixedly clamp the anchor bars in their adjusted position, wedges 12 are driven beneath the clevises 11 and intermediate such clevise and the supporting arm 7 of the bars. These wedges 12 exert an upward pulling effect upon the clevises causing their hook ends to firmly engage with the rod 10 and at the same time exert a downward pressure upon the supporting arm 7 of the anchor bars to clamp such arms against the top margins of the flask.

In the event that it is found that a particu lar anchor bar 2 interferes with the pattern,

. or if the anchor bar selected happens to be of greater depth than that of the flask, blocks of wood or shims 13 may be inserted beneath the supporting arms 7 of such bar and the margin of the flask wall as illustrated in Clevises 11 of different lengths are provided for such contingencies. Insertion of the wedge 12 beneath the clevice 11 in such case not only clamps the anchor bar 2 but also the inserted block or shim employed for elevating the bar relative to the pattern and the flask.

It frequently becomes necessary to anchor the sand mold intermediate the pattern and the side wall of the flask where a continuous The present practice is to nail blocks of wood or short wing sections interiorly of the flask. In the present construction, however, cast metal grids or wing bars 15 are provided which are engageable in any desired position with the rods 10. These wing bars 15 are also formed in various shapes and sizes, so that the molder may have an assortment from which to select a wing bar applicable to a particular job. Such wing bars comprise open or perforated frames and are formed at one side with an indentation 16, the outer side of which is flattened into a finger 17 for insertion behind the rod 10, which, when the wing bar is properly positioned, extends through the indentation 16. A wedge 18 is then driven tig tiy behind the rod 10 and intermediate such rod and the flattened finger 17 thereby firmly clamping the fingers 17 of such Wing bar against the interior side wall of the flask. Obviously the transverse bar 2 and the Wing bars 15 may be engaged in various positions along the rod 10 as is necessitated by the general shape and proportion of the pattern to be embedded within the sand.

Not only are the sand anchor elements formed straight for transverse positions across the flask and short for positions intermediate a pattern and the flask wall, but they are also formed circular and rectangular for use more particularly in association with patterns having large open areas. Such construction is shown in Figs. 3 to 6 inclusive. Such circular, rectangular or other circuitous shapes of anchor members whetheroval,elliptical or polygonal, not only serves to anchor and support the sand, as do the bars 2 and Wings 15, but they also effect a very material saving of sand and minimize the labor requirement in embedding a pattern. For example, when it is desired to cast a. body having a large circular opening such as the body illustrated in Figs. 4 and 5, a circular anchor member, as illustrated at 20 in Fig. 3 is employed interiorly of the open area of such pattern or body. Such anchor member as shown in Figs. 3, 4 and 5, is of circular form having marginal flanges 21 at its top and bottom. Such members are provided with radially projecting arms 22 projecting exteriorly of the anchor member and sometimes are provided with other arms 23 projecting interiorly thereof. These arms 22 may be utilized to support the anchor member 20 in the same manner that the supporting arms 7 are employed by resting the arms 22 upon the margins of a flask and clamping them in position by clevises 11 and wedges 12. In the particular construction shown in Figs. 3 and 4, however, the anchor member 20 is supported upon an independent bar 24 positioned across the flask and secured by clevises 11 and wedges 12 as before described. The anchor member 20 is then supported upon such transverse bar by additional clevises 11 and wedges 12 in the same manner. If the anchor member 20 selected does not possess the necessary depth to correspond with the flask, two or more of such members may be interconnected by means of clevises and clamping wedges, as is illustrated in Fig. 1. When such sand anchor members are positioned interiorly of the open area of a pattern, as shown in Fig. 4, it is necessary to 1 compact sand intermediate such supporting member 20 and the pattern but the area interiorly of the member 20 is left open. Other wise, under the usual foundry practice, it

would be necessary to fill the entire open space of the pattern with molding sand. Not only does this require a large quantity of sand, but the labor of tamping and compacting such sand is a very considerable item of expense, and when a large open area must thus be filled with sand, the sand within such space being unsupported is likely to collapse and the mold be destroyed. By the use of the circuitous supporting element such as shown at 20, a lesser quantity of sand being employed there is not the weight of sand to be lifted and held in place, and such member effectually supports and reinforces the lesser quantity of sand to form the mold exteriorly of such supporting member 20. Such supporting member is perforated as indicated at 25 to vent the mold and permit the free escape of gases. This is an additional advantage of this type of supporting member. Thebody of sand intermediate the supporting member 20 and the casting being comparatively narrow, the heat and gases generated by pouring the molten metal into the mold is freely vented through the perforations 25 of the anchor member 20. In Fig. 6 there is shown a similar method of operation wherein a rectangular metal frame is to be cast. This frame is shown in cross section at 26. The upper and lower portions of the frame are embedded respectively in the cope and drag of the flask. The common practice is to fill the entire interior of the flask with molding sand suitably supported by transverse wooden slats or bars fixed in the cope of the flask. In the present method, however, a rectangular supporting member 20 is employed interiorly of the pattern of the frame to be cast. By this means the mold sand is confined to a comparatively small portion of the flask intermediate such support or anchor member 20 and the side walls of the flask, leaving the entire interior portion of the'flask open. Like the circular form of supporting member 20, the present rectangular form is provided with top and bottom outturned flanges which afford anchorage engagement with the sand. The web portion of sucn member is perforated at comparatively closely spaced intervals to afford vent openings for escape of heat and gases during the pouring of the casting. The support member 20 is provided at intervals with laterally extending arms 7 wh ch overhang the top margins of the flask in quite the same manner that the supporting arm 7 of the bars 2 so engage. These arms 7 are fixedly engaged with the flask by means of clamping clevises and wedges to secure the supporting member 20 in predetermined relative position interiorly of the flask wall.

In lieu of the attachment rod 10 located interiorly of the flask walls with wh ch the clevises 11 engage, there is shown in Figs. 3 and 7 an alternative construction wherein a metal plate 27 is secured to the inner wall of the flask, the top margin of which is overturned in an inverted channel form, as at 28. The ends of the plate 27 are bent at right angles, as indicated at 29, and secured to the end walls of the flask to afford reinforcement of the flask. The plate 27 is so located upon the wall of the flask that its lower margin projects in overlapping relation with the wall of the drag or cheek of the flask as the case may be to afford an antirunout strip. Such overlapping relation is indicated at 30 in Fig. 7. By th s means, the walls of the wooden flask are protected against burning by the leakage of molten metal. The plate 27 and wall of the flask to which it is attached are preferably perforated at intervals beneath the overturned top flange 28, as indicated at 31, to afford ventopenings through which and heated vapors may escape. IVhile this inverted channel will be more or less completely filled with sand, such sand. will be loose since it cannot be eii'ectnally compacted or tamped therein, and consequently the inverted flange aflords an easy escape passage for the heated gases and vapors. The primary purpose of this flange, however, is to afford attachment means for the clamping clevices 11. Instead of hooking the lower ends of such clevises about the rod 10, such hooked extremities are engaged beneath the down-turned marginal flange 28 of the plate 27 and the anchor bar or supporting member of whatever shape may be desire c s secured by a clamping wedge driven under the bight of tie clevis as before described, and as illustrated in Figs. 3 and 7.

Such. construction whether embodying the rod 10 or the flanged plate 27 enables the anchor bars or supports to be coupled therewith at any desired point throughout the length of the flask. Such sand anchor or supporting members may be shifted to and fro as found necessary or desirable when accommodating the flask to the pattern.

In lieu of the anchor rod 10 or flanged plate 27, the flask may be provided with inverted hooks 83 at spaced intervals upon the outside of the flask with which clevis links may be engaged. For such use, the clevises may consist of closed links preferably of rectangular, form, such as is shown at 11' in Fig. 6. The clev ses and engaged bars or arms are secured by means of the wedges 12 in the manner heretofore described. Aside from the increased range of adjustability afforded by the anchor rod 10 or the flanged plate 27. these exterior hooks 33 will perform all of the essential functions in securing the lifting or sand anchor bars or frame.

After the metal has been cast and allowed to partially cool, the sand and casting are shaken out of the flask. \Vhen using old style flasks having fixed anchor bars, it was necessary to hammer the sdes of the flask in order to loosen the sand in many instances. With the present detachable anchor bar construction, it is only necessary to loosen the anchor bars by knocking out the locking wedges 12 whereupon upon lifting the flask, the entirebody of the sand mold with the enclosed casting will readily fall from the flask.

In Fig. 8 there is shown a typical round metal flask within which one of the present lifting members 20 is shown suspended from a transverse supporting bar 24. The disclosure of Fig. 8 is intended only as an extreme illustration of the relative adjustment of which the present construction is capable. In this figure, the transverse supporting bar 24 is shown elevated at one end by an interposed shiIn-block 84 to an extremely inclined position relative to the cope 1 of the flask.

Thetransverse supporting bar is secured in such inclined position with one end resting upon the elevating block 34 by means of clevis links 11 engaging with exterior hooks 33 upon the cope 1. The clevis links 11 are locked or tightened by means of the locking wedges 12. Suspended medially from the transverse bar 24 is an annular lifting member 20 such as is also shown in Figs. 3, 4 and 5. However, in Fig. 8 this lifting member 20 is suspended in an inclined or askew postion where it is held by interposed shims or spaceblocks 35 interposed between one side of the annular lifting member 20 and the supporting barv 24. The lifting member 20 is secured to the bar 24 in its suspended position by means of the clevis link 11' which engage with the inwardly projecting arms 23 of the member 20 and are tightened by the locking wedges 12. lVhile it is many times desirable to support any one or more of the various forms of lifting members or anchor bars in an inclined position, the inclination of the supporting bar 24 and the lifting member 20 in F ig.-8 are very much exaggerated.

As a further means of anchoring the sand mold and also of reducing the bulk or quantity of the sand, there are provided removable corner plates 36, shown more particularly in Figs. 9 and 10 but also shown in Fig. 3. It is more of common practice to secure fixedly within a flask, diagonal corner blocks or partitions of wood. The present removable corner plates 36 enable such diagonal plates of various lengths to be employed so that the capacity of the flask may be varied. Such corner plates or partitions are formed from metal plates, preferably though not necessarily perforated, having their opposite margins flanged in reverse directions. The top flange 37 of such corner plate is comparatively wide to overhang and rest upon a supporting bar 38 laid diagonally across theflask and resting upon the end and side walls. The lower marginal flange 39 of the corner plate. 36 is'for, the purposeof engaging and supporting the sand body and is of somewhat less width. The corner plates 36 and their supporting bars 38 are securely clamped in position by disposing thereacross a'transverse bar 24 or by resting thereon the extended arm 7 of the anchor bars 2. Such supporting bars 24 or the arms 7, as the case may be, are secured in position and in clamping engagement with the underlying corner plates 36' and their supportingbars 38 by means of the clevis links 11 wh'ch are tightened by means of the wedges 12. By providing such corner plates 36 of various lengths as well as various depths, flasks may be accommodated to the size of the pattern and the quantity of sand necessary to fill unneeded corners of the flask is materially reduced.

To enable the flask to be lifted and turned as may be needed, it is usual to provide trunnions on the sides of the flask, which may be engaged with the lifting chains of an over head crane or the like. To economize space on the molding floor, it is desirable that the flasks be positioned closely adjacent to each other. The presence of the projecting trunnions interferes more or less with the close positioning of such flasks upon a molding floor. In the present construction there is provided a detachable trunnion 4O engageable with a socket 41 secured to the side of the flask 1, as illustrated in Fig. 1. This socket is preferably formed with an interior bayonet slot while the detachable trunnion 40 carries a projecting lug 42 for interlocking engagement within the bayonet slot of the socket 41. By thus detaching the trunnions 40, the flasks may be set more closely together.

From the above description it will be apparent that there is thus provided a device of the character described possessing the particular features of advantage before enumerated as desirable, but which obviously is su ceptible of modification in its form, proportions, detail construction and arrangement of parts without departing from the principle involved or sacrificing any of its advantages.

While in order to comply with the statute the invention has been described in language more orless specific as to structural features, it is to be understood that the invention is not limited to the specific detaiis shown, but thatthe means and construction herein disclosed comprise the preferred form of several modes of putting the invention into effect and the invention is, therefore, claimed in any of its forms or modifications within the legitimate and valid scope of the ap pended claims.

Having thus described my invention, 1 claim:

1. The combination with a molders flask, of a plurality of sand anchor bars detachably engageable therewith, including an open frame-like portion extendingwithin the flask, lateral arms upon the frame overhanging the side walls of the flask. clevises engaged with the flask through which the arms extend, and

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clamp wedges insertable beneath the clevises for clam pin the arms in engagement with the flask walls.

2. The combination with a molders flask of a sand bar therefor comprising an open frame-like portion for projection within the flask. and terminal arms thereon overhangin g the flask walls, attachment links engageable with the flask walls and overhanging the terminal arms, and means for tightening the engagement of the links and terminal arms for clamping the bar against the edge face of the flask wall.

3. The combination with a molders flask, of a sand lifting bar therefor including an open frame-like portion for projection within the flask and terminal arms overhanging the flask walls, attachment links having sliding connection with the flask walls and en gaging with said arms, and means for tightening the engagement of the links to clamp the sand bar in adjusted position.

at. The combination with a molders flask, of a sand lifting bar therefor comprising a medial open frame-like portion for projection within a flask, and terminal arms overhanging the walls of the flask. attachment links for coupling the arms to the flask walls and an anchor member carried by the wall of the flask with which the links are. engageable in different positions of adjustment longitudinally of the flask.

5. The combination with a molders flesk, of an anchor member mounted upon the inner side of the flask wall and a sand lifting member comprising a frame-like portion for embedment within a body of sand within the flask, and an arm projecting from said framelike portion and bearing upon the top marof the flask wall and detachable clamping means engaging with the anchor member and exerting vertical clamping pressure upon the arm into engagement with the flask wall against the resistance of said anchorage member.

6. The combination with a molders flask of a. longitudinally disposed anchorage member upon the inner side of the flask wall and a plurality of vertically adjustable sand lifting bars and means for fixedly engaging the bars therewith at indeterminate points throughout the extent of said anchorage member.

i. The combination with a molders flask, of a reversely flanged plate secured to the inner side of the flask wall with its margin opposite its reverse flange extending beyond the margin of the flask into overlapping relation with a succeeding section of the flask, a series of sand anchor bars and connector means to hold the said bars in detachable engagement with the reverse flange of said plate.

8. The combination with a molders flask, of a longitudinally disposed anchorage member mounted upon the wall of the flask, a sand lifting bar having an open frame-like por tion for embedment in a body of sand in the flask, a portion engaging the wall of the flask and clamp means engaging with said anchorage member and with the wall engaging portion of the sand lifting bar for detachably securing the latter in adjusted position.

9. The combination with a molders flask, of a sand supporting member to be positioned interiorly of the mold for confining nold sand intermediate the saidmember and the flask wall, said supporting member being exteriorly flanged for engagement with the sand mold and perforated for venting the mold, arms upon said member for supporting the member upon the wall of the flask and clamping means for securing the arms in adjusted position.

10. A flask section to contain the mold, a I

circuitous wall member in spaced relation with the walls of the flask forming a circuitous sand mold intermediate the wall member and the wall of the flask and leaving the interior of said mold open and adjustable tie members bridging the mold space intermediate the said walls and detachably interconnecting them with each other.

1.1. The combination with a molders flask, of a sand supporting member adj ustably carried thereby in inwardly spaced relation with the walls of the flask whereby the sand mold is confined between said member and the walls of the flask, the space interiorly of the sand supporting member being open, and means for detachably connecting said member with the walls of'the flask.

12. The combination with a molders flask, of a sand supporting member separating the interior of the flask into inner and outer compartment-s, whereby a sand mold for a casting having an open interior may be formed in the outer compartment, the inner compartment being, left empty, said supporting member be ing flanged for anchorage engagement with the sand-of the mold and perforated to vent the mold into the inner compartment, and means for detachably connecting said sand supporting member with the flask.

13. The combination with a molders flask, of supporting bars resting upon the margins of the flask, links overhanging the bars and j connected with the flask, and wedges for tightening said links to clamp the supporting bars in adjusted positions.

14. In a molders flask, a flask section and relatively adjustable detachable continuous circuitous partition walls therein for c0nfining the molding sand to the portion of the flask adjacent its side walls leaving the central portion of the flask open, whereby the shape of the mold is made to conform more nearly to the contour of the piece to be cast thereby conserving mold material. and means for removably supporting said partition Walls upon the flask section in adjusted position relative thereto.

15. The combination with a molders flask, of removable corner partitions diagonally disposed across the corners of the flask for excluding molding sand from the corner space and means for detachably securing said corner partitions in adjusted position.

16. A sand lifting bar for molders flasks comprising a metal frame including mullions dividing the frame into a plurality of open spaces, the top margin of the frame being flat and laterally flanged, the bottom margin of the frame being thickened to form lateral marginal beads of substantially convex form, said beads being roughened by notching, and terminal arms substantially coincident with the top margin of the open frame extending in opposite directions beyond said frame portion.

17. The combination with a molding flask of a sand supporting member positioned interiorly of the flask in substantially parallel spaced relation with the walls of the flask to form therebetween a circuitous mold space to receive mold sand, and tie means bridging such intermediate mold space beyond the limits thereof and detachably connecting the inner sand supporting member with the flask.

18. A sand mold in which is to be formed a continuous circuitous sand mold body having an open interior, including relatively spaced outer and inner walls, the sand mold body being confined between said spaced retaining walls, a supporting bar resting on the outer walls and extending across the mold, and clamp means for releasably securing said supporting bar to both said walls.

19. The combination with a molding flask of an anchor member extending in substantially parallel longitudinal spaced relation with the side wall of the flask, of sand supporting wings, ears on said wings laterally adjustable relative to the flask wall upon said anchor member insertable intermediate the anchor member and the flask wall and means for clamping the wings in adjusted relation with the flask wall.

20. The combination with a molding flask of sand supporting wings laterally adjustable relative to the side walls of the flask and extending thence inwardly in perpendicular relation with the side walls of the flask and clamp means for detachably securing the wings in adjusted relation.

21. A sand supporting wing for a molding flask comprising an open frame like structure divided by transverse integral bars into a grille like structure, and flat bearing portions formed at one margin thereof and disposed in perpendicular relation to the general plane of the structure for abutting engagement with the interior wall of a molding flask for lateral sliding movement relative thereto and from which the wing will project in cantilever relation and means for securing the Wings in any one of various positions of lateral sliding adjustment.

In testimony whereof, I have hereunto set my hand this 31 day of August A. D. 1929. GEO. H. KRAMER.

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