Oct. 29, 1946. w. J. MILLER ET Al. ~ 2,410,123 METHOD AND APPARATUS FOR APPENDAGING` POTTERYWARE Filed'Jan. 27, 194s 2 Sheets-Sheet l 1576.71. r fll / f 1/ f/ /A f l / \ \S N . \ `Qì\\ \ \\\\§ `\Q\ \\\\\\\`\\\\\\ \\\\ \\ \\\ WILLIAM J.' MILLER ASHLEY J. REEK BY Oct'. 29,- `1946. w. J. MILLER r-:T AL 2,410,123 METHOD AND APPARATUS FOR APPENDAGING POTTERYWARE Filed Jan. 27, 1943 2 Sheets-Sheet 2 IN'VENToRxi.4 WILL/AM d. MILLER ÉYSH'LEY d. REEK 700m“ „TORZEî/ï l2,410,123 Patented Oct. 29, Y1946 UNITED STATES PATENT orifice;- ._ ivmrnop `AND APPARATUS Fon Ar l?ENDAGI,NGy POTTERY “TARE , William J. Miller, swissvale, and Ashley J'. Reek, Carrick, Pa., assîgnors to Miller Pottery Engi neerìng Company,` Svvîssvale,- Pa., a corporation -' ‘ of Pennsylvania Applicata@ January 27, 1943, serial No. 473,670 4 Claims. 1 . This is a continuation in part of our coepend ing application Serial No. 392,276, filed rMay '7, ` 1941, and it has to do with apparatus for ap-. pendaging pottery ware, particularly the >mold which is employed to form the appendage. More particularly, the present invention has to do with the sprue or that portion of the solidified material which remains in the fillingopening after the appendage has set up and the problem of removal from the remainder of the appendage without tearing out material forming the ap pendage. The object is to obtain a clean Abreak close to the surface of the appendage requiring little or no sponging or fettling -to remove the traces thereof. (Cl. 25-129) l I Y ' l In the drawings: Fig. 1 is a view showing a casting unit With the rear mold section removed illustrating how the appendageis 'cast and united to the pre 2 A toured ware receiving surface. 5, Fig. 9', of a partible mold, Figs. 1„ 2 and 3, in leakproof sealed relation. The partible mold which comprisesl two mating sections 6 and> 6a is hingedly mounted on a hinge pin 'I and is opened and closed me-Ã. chanically in the manner described in our co pending application. Fluid slip -is fed to. the, mold through a rubber nozzle 8 fitted into a pipe 9 leading to` a source of supply of iiuid slip and the appendage, in'this instance a cup handle, is cast in inverted position. '_ ' Slip >entering the iilling 'hole 9 of the vmold passes intothe molding cavity through a gate in the form of a narrow reduced passage rIi! to one 15 side and at the bottom of the hole having the pro portions of a slít,-see Figs. 2 and 3, the filling hole being of such capacity that it Will hold a reserve supply of slip Yto be fed to the molding cavity> as the'appendage shrinks and solidiñes. Since thefabricated ware. 20 flow of slip through the outlet I5 of the molding cavity is blockedby the ware, the appendage be Fig. 2 is a fragmentary section showing the comes attached to the> ware as it solidiñes,y a per restricted passage between the mold cavity and manent bond ofähigh mechanical strength being ' the ñlling opening. ' Fig. 3 is a fragmentary section looking down on’l ' formed.l The material remaining in the iilling hole 9 top of the restricted passage of Fig. 2. and the slit yI Il after the appendage rhas solidified Fig. 4 is an elevation of a -mold half illustrating: forms a sprue I I, Fig. ’7, which is attached tothe another form of iilling opening. ' underside of the appendage by a portionV I2 of Fig. 5 is a sectional elevation through ther low mechanical strength or a weakened portion._ center of the mold with the two halves in closed When the sprue is detached,.it will break throughV the weakened> portion at substantially the level Fig. 6 is anenlarged sectional View showing the of the surface of the appendage or slightly there above, _as illustrated in Fig. 8. If a 'slightI Fig. A'l is a sectional View illustrating the iin prominence I4 remains onthe appendage, this' like juncture between the spr-ue and the append relation. slit. ' I f _, , age. may be- removed by sponging orfettling.' Some times the sprue will break offv flush with the sur face of the appendage in which case only the away from the appendage. " ~ ~ ' ’ roughened surface need only be rubbed over Fig. 9 is a plan view of a mold section and rigid with a sponge to smoothoif the blemish; A sprue hinge plate on which the same is mounted.A Fig. 10 is an elevation of one section of a parti 40 connected or Vattached to the appendage by a weakened portion will break off without tearing ble mold showing a modified form of pouring hole outthe material of the appendage and leaving a and gate. " pit orY cavityl therein which cannot be repairedy Fig. 111s a topplan view’of the complete mold, or erased by sponging. Considerable ware is ren of which one section is illustrated in Fig. 10. Fig. 8 shows how the sprue of Fig. ’7 is broken Fig. 12jis a fragmentary View showing how the; dered second or third grade by _becoming pittedl sharp edge at the juncture of the sprue with the in the'manner described and while the pit is in a concealed location, it nevertheless is discernible appendage. when the cup is raised. l gate may be filleted to avoid'the production of al " The slit I0 at the bottom of the hole 9 prefer~ With reference to Fig. 1, an appendage cast ing unit is shown which includes a base AI and 50 ably communicates'with the molding cavity at the uppermost zone thereof in order that air ven- ' a thruster 2 fully described in our co-pending Vtrapment will be minimized and complete ñlling application and therefore not described in detail of the mold assured. Oi’ course, in actual prac here. The thruster 2 is actuated by mechanical tice,> the' seal between the wall of the ware and linkage 3 to press the Wall `of an inverted piece of prefabricated pottery Ware 4 against ‘the con 55 the contoured'surface 5l of the mol-d is not en 2,410,123 4 tirely perfect due to surface irregularities and air will escape therethrough. primarily responsible for filling the cavity to its' limit and driving out the air. As soon as the liquid slip reaches the juncture, the solid con stituents immediately plug the crevice so that the slip does not leak out. The mold of Figs. 4, 5 and 6 is made up of sep arable sections each of which has hinge forma tions 20 with grooves 2l to ñt the hinge pin 1. A The gate or slit I0 is illustrative of only one Y Spring Clip- 22, Fig. 11, may be used to clamp the form of passage which will produce a weakened mold sections together. lThis type of-mold may be used with automatic mold opening and clos ing machinery or may be opened by hand if pro bond between the sprue and appendage. Other shapes or forms of gate than that described may answer the purpose and therefore we do not de sire to be limited to this speciñc shape or form Y of gate illustrated. The dimensions of the gate should be such that it will not clog as long as the clay slip will flow. Of course, when the material solidiñes, all flow through the gate ceases. The f vided with the friction roller devices 23 or simi lar appurtenances such as illustrated in connec tion with the mold of Fig. 11 which stand out at an angle from the body of each section on op posite sides of the mold and are adapted to be 15 engaged and pressed toward one another :to bond between the sprue and appendage should spring the mold open in an obvious fashion. also be strong enough to support-l the weight of , In the mold ofrFigs. l0 and 11, the same gen waste material forming the sprue when the mold' ' eral principles of construction of the pouring is opened. Sometimes the sprue has a liquid hole and gate are retained, however, the pouring center and premature breakage would spatter 20 hole 24 herein is enlarged and cylindrical or el the ware which is not desired. liptical in shape and may taper toward the' base The sprue may be removed from the Vappendage or may have a straight side if desired, The bot by knocking it sîdewise along the line of juncture' tom of the hole has a pronounced taper as at 25 with the appendage, Fig. 8, or it may be pinched leading into »the slit or gate 2B to the molding lightly between the thumb and index linger and 25 cavity. In this form of pouring hole, the gate is twisted. directly below the pouring hole whose gate is near A method of removing the sprue without touch the top of the molding cavity. Otherwise, »the ing the same with the fingers is to grasp lthe cup securely in one hand while it rests on the support I and then lift it clear and snap off the sprue by flipping the cup and then abruptly halting it. This causes the sprue Áto snap off of its own mo mentum across the weakened portion. This is mold is the same as that shown in Figs. 4, 5 and 6, and is notched out at 25 at the rear around the hinge pin in or-der that the sections may pivot Yon the pin. . . . , Thus, the present invention also contemplates a. method of appendaging' pottery ware wherein the mold and prefabricated ware are ñrst brought usually done over a receptacle into which the waste material is thrown. This method speeds up 35 together with the outlet 26 facing the wall of the the process of removing the sprue by eliminating cup and then slip is poured or piped into the excess manual handling. In Figs. 4, 5 and 6 is Yshown a separable mold pouring hole and discharged into the , cavity through a reduced inlet or passage toy form an appendage having a sprue attached thereto by a having a pouring hole I5 of globular or spherical shape whose inlet I6 may be circular or elliptical. 40 weak portion. After the appendage is solidified, This form of pouring hole produces a` sprue of the sprue is Vdetached by breaking it oif,'the .Weak balanced design less apt to crackoff prematurely portion giving way and permitting a clean sepa . when the mold is opened. Furthermore, being of ration substantially flush withpthe surface of the globular or spherical shape, there are no crevices or sharp corners for the clay to stick in and the- .clay slip in the cavity will tend to shrink uni formly from theV wall thereof. Having an inlet I B which is small in proportion to the area of the hole I5, only a small portionV of the contents is; exposed to atmosphere. This retards setting up in the sprue before the Yappendage solidiñes. It will be understood that the wall of .the holes 9 or I5 may be treated or impregnated with oil,` wax, gum, shellac or other preparation which will retard the absorbtive characteristics of the plaster of which the wall is formed in order lthat the sprue will remain iluid longer than the appendage'` and thus capable of supplying additional materiali` to the appendage cavity as solidiflcation sets in._ This treatment may also be administered tothe 60 Walls of the gate 9 or slit I'I, Fig. 5, which isy formed at the bottomKof a passage I8 communi-l cating with the spherical hole I5. The sprue thus formed has the shape of aball supported on a stem attached -to the appendage by a weakened portion as at I 2, Fig. 7. The lower wall I9 of the passage I8 preferably tapers into the slit. TheV gate Il communicates with the mold cavity at a point below the uppermost limits of the inverted mold cavity. We haverfound that this location is 70 also satisfactory and that little or no air entrap ment results. The volume of clay slip which .thea hole I5 will hold will produce sufficient sta-tic head to fill the appendage cavity completely.V Of course, the static head in the supply` pipe 9 is appendage. Y Y l ' Figure 9 shows a mold section Vrepresentative ’Y of any one of those previously described wherein the hinge formations Zumay be‘omitted and a metal backing 28 with a hinge formation 29,-sub stituted therefor. This type of composite Ymold is shown in Fig. l and the two piecesv ofj‘the section may be joined by casting the plasterpor tion on the metal portion. When the plaster wears out, it is simply knocked off and a new plaster section cast on the hinge plate. 'Obf viously the plaster mold may be cast separately and attached to the hingerplate by screws. - f In Fig. 12, we have shown how the gate may be filleted, ’as at 35i, in order to eliminatea sharp edge at they juncture of Vthe sprue with the ap-Z pendage. The object is to insure that the sprue will break oif above Vthe surface of the appendage` and not tear a hole in the appendage.,_ It will be understood that the fillet may or may n_ot be employed,4 as desired., -f Y » i Y ' In _snapping olf the sprue withoutftouching itrby hand, the factor oir-inertia is involved due to the property of the sprue to continue its mo tion and snap off when the motion of the ware< is arrested. Therefore, ¿we prefer to refer t0 this operation as one wherein'the sprue is- snapped' off'by inertia. Having thus describedV our invention, what we claim is: ~f v l. A »mold for casting an appendage on pre-'Í fabricated `>potte‘ryware comprising, a .se-parable 2,410,123 6 5 body having a ware engaging surface contoured body having a ware engaging surface contoured to ñt the exterior surface of the ware, a molding to ñt the exterior surface of the ware, a molding cavity in which the appendage is formed having cavity in which the appendage is formed having an outlet through the ware engaging surface and a pouring passage through which casting an outlet through the ware engaging surface and a pouring passage through which casting slip is poured into the molding cavity formed with an elongated rslit at they bottom of the pas slip is poured into the molding cavity formed for producing a waste piece joined to the appendage -by an elongated neck that is substantially nar rower than either the appendage or the waste sage that is substantially narrower than the remainder of the pouring passage or the mold or the waste piece. 2. A mold for casting an appendage on pre that is substantially narrower than either the appendage or the waste piece. piece and provides a rupture area having less 10 ing cavity for producing a waste piece joined to the appendage by a rupturable elongated neck resistance to breakage than either the appendage fabricated potteryware comprising, a separable body having a ware engaging surface contoured t0 fit the exterior surface of the ware, a molding 4. In the appendaging of prefabricated pottery " ware, the method which comprises slip casting an appendage against the exterior surface `of the prefabricated ware and forming a waste piece joined thereto by an elongated neck that is sub cavity in which the appendage is formed having an outlet through the ware engaging surface and a pouring passage through which casting slip stantially narrower than the appendage or the is poured into the molding cavity formed for 20 remainder of the waste piece, the waste piece above the neck having suñicient mass to cause producing a waste piece joined to the appendage it to snap off by inertia and, after the cast has by an elongated neck along the seam line be been made, removing the ware with the ap tween mold sections that is substantially nar rower than either the appendage or the balance of the waste piece and may be broken off flush or immediately above the surface of the ap pendage when pressure is exerted on the Waste piece across the narrow dimension. 3. A mold for casting an appendage onk pre fabricated potteryware comprising, a separable pendage and waste piece attached thereto from the mold and moving the ware in such a man ner as to break the restricted neck across the narrow dimension by the inertia of the waste piece. 30 WILLIAM J. MILLER. ASHLEY J. REEK.