US1555442A - Molding flask - Google Patents

Description

Seht'. 29, 1925.

J. A. SPERRY HOLDING FLAsK Filed April 18., 1923 2 Sheets-Shoot 1 lum Mmm

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J. A. SPERRY MOLDI NG FLASH 2 Shqetsf-Shesf 2 Filed April 18, 1923 v .9% 8 80 2 m 2.. 8 ,m u 3 2 w 0.4/0 x uw w 1 0.2 2 6 g Mr v M Al 1 3 m i 4 An mi .L L Usf FI.. W 4/. wl 3. w/ 3 3g W 2 Patented Sept. 29, 1925.

"UNITED STATES JOHN A. SPERRY, OF MUNNSVILLE, NEW YORK.

MOLDING FLASK.

Application filed April 18, 1923. Serial No. 632,946.

To all whom t may concern.'

Be it known that I, JOHN A. SPERRY, of Munnsville, county of Madison, and State of New York, have invente-d certain new and useful Improvements in a Molding Flask, of

which the following is a'specilication.

This invention relates to molding flasks, and more particularly to flasks adapted for vmanual manipulation.

The prime object of the invention is to provide a flask, such that it may be removed from the mold with the expenditure of a minimum of time and labor upon the part of the operator.

Another object of the invention is to provide a flask of the above character, with iur proved means for freeing itself from the mold.

Another object of the invention is to provide improved means for retaining in the cope that part of the mold formed therein,

while the cope is being manipulated to po-l sition it upon the drag after the pattern drawing operation.

A further object of the invention is to provide a flask which can be freed from Jthe mold without danger of disturbing the block of sana constituting the mold, and whereby no entrance is made into the mold, such as are made by devices now employed to hold the sand block formed in the cope during -the handling of the latter to position it upon the drag.

A still further object of the invention is to provide a strong durable flask, capable of withstanding without injury or impairment of efficiency, the rough usage or handling to which these devices are ordinarily subjected, which eliminates several objectionable features present in flasks of this character as hitherto constructed, and which may be manipulated with a great saving of 1seth time and labor.

ther objects and aims of the invention, 45 more or less specific than those referred to above, will be in part obvious and in part ypointed out in the course of the following drag, whereby the sand is displaced and the description of the elements, combinations, arrangements of parts and applications of principles, constituting the invention; and the scope of protection contemplated will be indicated in the appended claims.

In the accompanying drawing, wherein there is illustrated a preferred form of em bodiment of my invention:

yFigure 1 is a side elevational view of my improved flask, showing the parts in position to remove the flask from the mold, the normal position of certain of the parts being indicated in dotted lines.

Figure 2 is a top plan view ofFigure 1.

Figure 3 is an end elevational view with the parts in the position illustrated in Fig. 1, parts of the end members of the flask being broken away better to illustrate the construction; and Y Figure 4 is an end view of my improved flask, showing the way in which the same is operated to free itself from the mold, parts of the side walls of the fiask being broken away.y

Before proceeding to describe the details of construction of my improved flask, it may here be noted lthat a considerable factor of the cost of sand castings resides in the labor cost expended in the formation of the sand molds. It is a well known fact that great losses are entailed by careless manipulation of the cope in .positioning it upon the quality of the castings impaired, or the castings destroyed. Moreover, in the art of casting it has heretofore been necessary to employ skilled labor in the operation of forming the molds, thereby increasing the cost of the castings. I aim by my present Iinvention to decrease the cost of hand-cast ing production, by producing a flask which can be operated by unskilled laborers or workmen, and which is of such construction that certainty of perfect casting production is assured, insofar as the formation of the molds is concerned.

Referring now to the drawings, wherein similar reference characters refer to similar parts, the reference numeral 1 indicates the cope, and 2 the drag, the two parts constituting the flask. Each of these parts is formed by side and end walls firmly sccured together as by means of thc metal straps 3, to provide substantially rectangular boxes adapted to be associated in the manner illustrated in the drawings with the cope positioned upon the drag in such a position that the inner surfaces of the end and side walls will be in exact registry. The side and end walls of both the cope and drag are inclined Slightly inwardly from the vertical, as is usual in flask construction, whereby the latter may be more easily freed from the sand block.

The side and end walls of the cope 1 upon their inner surfaces are provided with a plurality of relatively shallow surfaces, the purpose of which will be hereinafter eX.- plained.

Cope and drag have co-operating means whereby they may be placed together in the position shown in the drawings with great eXactness, whereby the out-lines or edges of the mold formed in the respective parts will lie in exact registry. This means in the present instance, and which forms no part of my present invention, comprises tapered pins 5 and 6 carried upon the flanges 7 and S upon angle-irons 9 and 1() fastened upon the opposite side members of the drag, as by means of the screws 11. 'ln the present instance the pins 5 and 6 are provided with threaded extensions which pass thrcugn apertures formed in the flanges 7 and 8 and are fastened to said flanges as by means of the nuts 12, threaded upon said extensions.

The side walls of the cope are likewise provided with angle-irons 13 and 1&1-, having the flanges 15 and 16 in which are former tapered apertures 17 and 18, the walls of which are inclined to correspond with the taper of the pins 5 and 6 so that when the cope is placed upon the drag, as shown, the aforesaid perfect registry of the inner walls of the cope and drag, and of the margineL portions of the molds, is assured.

rlhe reference numeral 19 indicates the presser board of the cope, and 2O the presser board of the drag. These presser boards, as is well known in the art, are employed in the molding machine to squeeze or press the sand tightly, respectively, into the cope and drag, and it will be noted that the thicknesses of the presser boards 19 and 2O are such that after the squeezing operation, the upper and lower surfaces of both presser boards are located above and below respectively, of the corresponding ends of the cope and drag.

The reference numeral 21 indicates the sand forming mold block, and 22 the mold which has been formed in the sand block,

one part 23 of the mold having been formed in the cope, and the other part 2li having been formed in the drag.

The construction thus far described, with the exception of the grooves l formed upon the inner surfaces of the walls of the cope,is well known in thisart; description thereof, however, being deemed essential in order tnat my invention, which I shall now proceed to describe, may be more fully understood.

Briefly stated, my invention comprises a pair of devices mounted upon the cope, and operated by the hands of the operator' when the latter is engaged in lifting the flask from the mold7 means being provided for holding the presser board of the cope stationary during the initial upward movement of the flask when lifted by the operator, whereby the flask is lifted cleanly from the mold without in anywise disturbing the latter. This means two of these devices are provided upon each cope, one on either side adapted and arranged for simultaneous manipulation by the operator, one device being located near the forward end of one side of the cope, and the other upon the opposite rearward side thereof, the parts being oppositely disposed. Inasmuch as these devices are of identical construction, but one thereof need be described.

Referring now to the device upon the righthand side, the reference numeral 25 indicates a lever, pivotally mounted upon a screw or bolt 26, carried upon the strap 3 of the cope. This lever extends inwardly substantially parallel for a part of its length with the side wall of the cope, indicated at 27, whence it extends outwardly as at 28, at an angle, whence it extends inwardly as at 29, which latter part' is substantially parallel with the side wall of the cope. This outer part 29 forms a handle, and is located adjacent and above the flange 8 of the drag,l which latter part, as will hereinafter be described, forms a finger or hand-hold for the operator of the flask, the dotted line 30 showing the manner in which the lower surface of this flange 8 is formed, whereby it may be more readily grasped by the operator.

Pivotally mounted, as at 31, upon the part 27 of the lever 25, is a rod 32, the upper end of which is provided with an inwardly formed extension 33, which when the parts are in the position shown in the full lines of each ligure of the drawing, overlies the presser board 19 of the cope. The rod 32, its lateral extension 38, and the lever 25, when these parts are in normal position, occupy the positions shown in the dotted lines of Fig. 1 of the drawings, in which position the lateral extension 33 is received underneath a catch or shoulder 34, formed upon the end wall of the cope, a recess 35 being formed in the end Wall of the cope Cil at lits -upper end to reeeivefsaid part.y The catch 34 may ble-conveniently formed by-*the metal straps 36 and 37, which-are attached to the upper ends. ofthe side and end lpieces of the cope, the recess being formed v by cutting away -a.portion ofthe end and side wall of the cope directlybeneath the catch 35 vof thesemetal straps, which has its end 33 slightly depressed to Aform a point over which passes the extension 33 of the rodA 32.

...Positioned about thepscrew or bolt 31 which pivotallyconnectsthe rod 32 with the lever 25 is a .spring 39,the end 40 of which engages withthe lever 25 and the opposite vend 41Vwith 42v of the rod 32.` "The tendency of this spring is toswing said. rod and the lever 25 to -the .positions shown in the full lines ofthe drawings; the uppermost position of the lever, and consequentlythe position of the rod, beingvdetermined by the engagement of saidlever fwith .astrap 43, which is formed .by .a strap extend-ing between a `fiXedA-point 44 andf-the strapqiron 3. This strap 43 performs the triple function of a stop fortheupward movement of lthe lever 25, as la guide for .the-rod* 32, and as a reinforcingvmember for that vpart ofthe cope Aupon which :is mountedthe-above described device.

, The strap 43 is; held spaced 4from the side of the -cope by V means -of theboss 45 and the spacer :memberf 46.- Having described my. .improveddevice, 4I shallnow proceed to describe thel operation thereof.

At this point -it willb e noted that when .the sand has .been pressed into theycope bythe squeezingfioperation, portions 46 of thesand havebeen forced intothe grooves ,4.y and these integrally fOrrned lportions or .ribs of thesand .bloek; projecting `into the grooves or recesses 4,serve to Ahold-the sand `block inthe cope during its handling to invert .it and- `mount it upon -the drag.

. It `will ybe understood that when ftlie=cle-l vices are not infuse, the parts occupy vthe positions shown inthe dottedlinesl of Fig. l, in which constructionsthe extension 33 is received underneath the catch 34,',the lever 25 being in its lowermost positionjnThe parts areiheld inthis position bythe engagement ofthe extension 33 ofthe lever, and thecatch 34. In operating the .device the handle is lifted by the operator, -whereupon v.the `extension 33 of .the lever 32 is forced outof its recess vand over the point 3S ofthe catch34, whereupon the @poration of the spring -39v will. swing the lever 32 to the position shown in the full 'lines ofthe drawing, said rod321being of-sufficient length to letr the extension 33 clearthe edge of the presser board 19.- The up-wardmovementv of the lever 25 -is arrested by its engagement withthe wfstrajp,43. The. f, opera- -a--rearward extensiontor thenfdepresses Vthe handle 29 ofthe lever 25 with-the vpalm of his hand, and vinserts and catches `the tips off-his fingers underneath. the flange 8.

33 and the lever into engagement with the presserboard. The operator thereupon contracts his hand to force the lever 25 down- -wardly,;and at the same time lifts the'entire flask by means of his fingers, which are in engagement with the flange 8, whereby the extension 33, which may be termed a presser member, through the presser board 19, .holds vthe sand block stationary on vthe 4presser board 20 ofthe cope, whereupona slight upward movement of the flask shears ofl" the ribs of sand 46 from the sand block, whereuponfthe entire flask may be readily lifted Afrom the mold.

Y It will be noted, due to the inclinedsurfaces of the inner wall of the zflask,.'but a slight movement is necessary tov .affect this shearing action, as `will be ,seen from an inspection of Fig. 4 of the drawings.

rlhe cope and .dragl are then disengaged and the parts whose Operation yisnext above described, are returned fto the position shown in the dotted lines of Fig. 1.- rIhis Ioperation is effected bymerel-y swinging the rod 32 rearwardly and `causing the `extension or presser member 33 to--aga'in engage with the catch 34.

It .will accordingly be seen that I have provided aconstruction welladapted` to attain, among others, all -theends and objects y l above pointed out in an exceedingly simple manner. The use of my improved. ldevice greatly facilitates :disengagement lof the flask from thelmold, and rsuch disengagement is effectedr by without in any fway disturbing the sand mold, the surfaces Aof the mold being free and clear, from any ridges or -grooves usually formed by finovable devices extending linwardly fromthe cope for effecting the locking operation between the cope and the sand block.

Having ythus described Vmy .invention what I claim' as newand .desire to sec-ure by Letg ters Patent is:

1. In .device of the class' described, the combination with a flask comprising two or more parts, andmeanscarried by one of said parts for holding the mold stationary when the flask is being drawn therefrom.

2. In ai device of the class described, the combinationwith a. flask comprising one or more-parts, and means for pressing the mold downwardly -when the flask is-liftedftlierefrom.

3. In a device of the class described, :the combination witha Aflask comprising one or more parts, and -means manipulated by the hands ofthe operator forpressing the mold lownwardly when the flask is lifted thererom.

rlhis operation Ahas carried the extension 4. In a device of the class described, the co-mbination with a flask comprising one or more parts, and mea-ns for manually effecting a slight relative movement between the mold and the flask at the instant the flask is lifted from the mold.

5. In al device of the class described, the combination with a. flask comprising two or more parts including a cope and its presser board, and means carried by the cope and engaging the presser board for exerting pressure therein when the flask is moved relatively to the mold.

6. In a device of the class described, the combination with a. flask comprising two or more parts including a cope and its presser' board, and means carried by the cope and enga-ging the presser beard adapted to be manually operated for exerting pressure therein when the flask is moved relatively to the mold.

7. In a device of the class described, the combination with a flask comprising two or more parts, including a cope, said cope and its sand block having mutually engaging parts, and means carried by the cope for severing one set of said mutually engaging parts simultaneously with the operation of lifting the flask from the mold.

8. In a device of the class described, the combination with a flask having a plurality of parts including a cope and its presser board, and a device mounted upon the cope for exerting pressure upon said presser board in a direction contrary to the movement of the flask when it is removed from the mold.

9. In a device of the class described, the combination with a` flask having a plurality of parts including a cope and its presser board, and a plurality of devices mounted upon the cope for exerting pressure upon said presser board in a direction contrary to the movement of the fiask when it is removed from the mold.

10. In a device of the class described, the combination with a flask having a. plurality of parts including a cope and its presser board, and a. plurality of devices engaged and operated by the hands of the operator mounted upon the cope for exerting pressure upon said presser board in a direction contrary to the movement of the flask when it is removed from the mold.

l1. In a device of the class described, the combination of a fiask comprising two or more parts, including a cope, and means mounted upon the cope for exerting pressure upon the mold while the flask is being removed therefrom.

12. In a device of the class described, in combination, a flask comprising a plurality of parts including a cope and a drag, and co-operating means upon the cope and drag for lifting the flask from the mold, and at the same time holding the mold stationary at the instant of the beginning of the flask lifting' operation.

13. In a device of the class described, the combination with a flask, comprising two or more parts including a cope, said cope having a plurality of recesses in its inner surface for receiving portions of that part of the mold enclosed therein, and means provided upon the cope for pressing upon the mold when the flask is lifted, whereby said portions of the sand received in its recesses are sheared off when the flask is lifted.

14. In a device of the class described, in combination, a flask comprising a plurality of parts including a cope, the inner surface of said cope being provided with a plurality of recesses adapted to receive projecting portions of the sand block, whereby the latter is locked in the cope, and means whereby said projecting portions o-f the sand block are sheared ofi1 to free the sand block when the flask is removed from the mold.

15, In a device of the class described, in combina-tion, a ask comprising a plurality of parts including a cope and a drag, said cope being provided with a presser board, oppositely disposed handles provided upon the drag, a plurality of presser members carried by the cope adapted to be moved in position above said presser board, and operative means for said presser members located adjacent the handles of said drag adapted to be enga-ged by the hands of the operator when lifting the drag to cause said presser members to engage with said presser board.

16. In a device of t-he class described, the combination with a flask comprising two or more parts including a drag and a cope, a

Apresser beard for said cope, a lever pivoted to said cope, a rod pivoted to said lever, havmg a presser member, means whereby said rod and its presser member are held in inoperative position upon said cope, means whereby said rod may be moved to carry said presser member above said presser board, and said lever being adapted to be operated when the flask islifted, to move said rod, whereby its presser member is carried into engagement with said presser board.

17. In a device of the class described, the combination with a fiask comprising two` or more parts including a cope and a drag, a presser board for said cope, a plurality of levers pivoted upon opposite sides of the cope, a rod pivoted to each of said levers, each of said rods being provided with a lateral extension, means upon said cope for holding said rods and their lateral extensions in inoperative positions, means for moving said rods and their lateral extensions into operative positions above said cope, a presser board adapted to rest upon the mold above said cope, handles tor "when lifting the desk to cause said lab eral extensions of said rods to engage with the presser board of the cope and press the latter downwardly when the liask is lifted from the mold.

In testimony whereof, I aiX my signature.

JOHN A. SPERRY.

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