Патент USA US2410312код для вставки
OctvZQ, 1946, A H. A. STORCH v MOLDING. ' ¿2,410,312 APPARATUS Filed Jul'y 15, 1944V l l il?! nlm n - 'I ‘ ' ` ^ ‘ INVENTOR. f/ßßœß- A’. 570/90/ M' ILM ' >` ,50% @Wm „Trae/v5 Ys 2,410,312 Patented Oct. 29, ~1946 UNITED-STATES PATENT* OFFICE Harold A. Storch, Fairview Village, Ohio Application July 15, 1944. Serial No. 545,114 5 Claims. (Cl. 18-9) 2 l This invention relates to the molding of arti cles from plastic material or materials in a plas tic state and aims to provide a novel apparatus by which molded articles, and particularly articles _ of revolution, can be rapidly and -economically ' ' I, grooves of the cooperating mold members .and> the mold recess formed by such grooves.> » . ' Proceeding with a more detailed description of Another object of this invention is to provide a the invention and referring to the particular embodiment illustrated'in the drawing, I show molding apparatus I0 comprising a pair of cooperating stationary and movable mold mem novel moldingv apparatus of this character, is in the form of a ring which 'provides a frame produced. . l involving the use of a grooved moldmember and bers II and I2. The stationary mold member II for the apparatus and has a substantially circu the step4 of rolling a ` body` of material in the 10 lar central opening I3 therein. " The movable groove for molding the material to article form. A further object'of the invention is to provide novel molding apparatus of the character men mold member I2 is in the form of a drum which is located in the circular opening I3 of the sta tionary member II and is mounted forrotation tioned, in which complemental grooves of a pair as will be presently described. The ring member of mold members forma mold recess of a cross 15 II is provided with oppositely extending projec 'sectional shape to correspond substantially with tions I4 by which it may be mounted on a suit the profile ofthearticle to be produced and such able support or foundation I5. ‘The ring mem' mold members are relatively movable inthe ber is of a hollow construction so as to provide direction of the grooves for rolling plastic mate therein a passage or chamber I6 for a curing.` or rial to article shape and advancing the article 20 treating medium which usually will be a heating along the recess. ‘ medium, such as steam, although it can be a Still another object of the present invention is to provide novel molding apparatus of the char acterrreferred to, having means for severing bod cooling medium depending uponthe requirements ofthe material `being molded. Usually the mate rial , will be a non-metallic material . such as ies or blanks from plastic stock in strip form pre 25 rubber or a rubber compositionzwhich is cured by liminary to the molding operation and means for heat and the medium will therefore be referred trimming the articles at or near the end of the to as a heating medium. . Such heating medium molding operation. can be circulated through the-` passageL I6 by Yet another object of this invention is to pro means of supply and exhaust pipes or conduits vide novel molding apparatus of‘this character, I1 and I8 which are connected with such passage in which the mold comprises relatively rotatable through the oppositely extending projectionsxl?l‘; ring and drum members and is heated or cooled so as to effect a curing of the material during the molding thereof. The invention can be further briefly summar ized as consisting in certain novel combinations ‘ The drum constituting the movable mold mem ber I2 has a pair of oppositely extending co-axial . projections or shafts 20 and 2I 'thereon and which are journaled in suitablebearings‘22 and 23 so as to mount the drum for rotation about the com mon axis of the shafts"2û and 2|. The bearings 22 and 23 are located on opposite sides of the and arrangements of parts, hereinafter described and particularly set out in the appended claims. In the accompanying sheet of drawings, Fig. 1 is a side elevation of molding appara tus embodying the present invention. ' Fig. 2 is a vertical sectional view taken through the apparatus as indicated by line 2-2 of Fig. 1. Fig. 3 is a Partial sectional view showing the feed opening and the severing means for the strip stock, the view being taken on line 3-3 of Fig. l. Fig. 4 is a _partial sectional view showing the 40 stationary mold member Il and >may be suitably mounted on the support or foundation I5. The - drum I2 is also of a hollow construction so as to provide therein a recess or chamber 24 to which some of the above-mentioned curing or heating medium can be supplied. The shafts 20 and 2I are hollow and .provide supplyand` discharge pas sages which communicate with the chamber 24 and into which supply and discharge vpipes or conduits 25 and 26 for the curing medium extend, means for trimming the molded articles, the view being taken on line 4-4 of Fig. 1. _ 50 as shown in Figs. land 2 of the drawing. The drum I2 can be rotated by supplying torque Fig. 5 vis a partial bottom plan view showing thereto through the shaft 2| and this can be the discharge opening for the molded articles, accomplished manually or by the use of any and » suitable power means connected therewith as lby Fig. V6 is a partial transverse sectional view on an enlarged scale showing the‘ complemental 55 means of the pulley 21 and the driving belt 28. 2,410,312 3 . The present invention involves the use of a mold recess or chamber 33 of a cross-sectional shape corresponding substantially with the pro ñle of the article to be produced. The mold chamber 3D is formed by cooperating comple mental mold grooves 3l and 32 formed respec tively in the adjacent zzo-extending faces of the stationary and movable mold members H and I2. The molding apparatus herein disclosed can be used in producing a number of'different ar ticles from rubber or rubber-like material or from any other moldable plastic material. In this instance and merely by way of example, the 4 member Il and can be normally held in a lifted condition by a torsion spring 42 so as to permit the insertion of the leading end 0f the strip 39 into the feed opening. The cutter 40 can be ac tuated by any appropriate means such as by a pin 43 projecting from the mold member l2 and engageable with the cutter during the rotational movement of this mold member. The cutter can, of course, be omitted and previously cut or pre pared lengths of stock canv be inserted> in suc cession throughithe feed opening 38'. ' In the operation of the apparatus herein dis "closed, the blanks 39a which are severed from method and apparatus are being usedgformthe the leading end of the strip of stock 39 are sub production of small button-like rubber articles jected to a rolling operation in the mold cham 33 which are commonly called bumpers and are ber `3i] by the rotation of the drum I2 in the used in large quantities in automobile body- work ring. member .,ll. During such relative move for preventing metal-to-metal contact between ment between the movable and stationary mold various parts of the vehicle. " members each blank or body of stock is rolled As shown in the drawing, the bumpers 33 are 20 and kneaded in the mold chamber 33 and is sub rivet-like-> articles having a rounded head> 33a jected> to pressure therein causing the. material and a tapered stem or shoulder portionf33b', with to be _distributed into and substantially 13.11 .the a locking Vgroove‘33c located between suchfhead complemental grooves ofk the'mold chamberat and‘tapered stem. The bumper 33 also includes the particularlocation of the blank `in such cham a tail 33d of relatively> reduced size which eX 25 ber. Since the materialis being` rolled along the tends` from the’ tapered stem 331). As is under mold recess it asstunes and retains a round or stood by those skilled in automobile-body work, these bumpers are mounted in openings» of :sheet cylindrical shape, that is-to »,say, it becomesA an article of revolution having aproñle correspondf metal parts- by inserting the tail 33d through inggwith the. shape -orpronle defined by the com the opening and pulling' the tapered stem 33h 30 plemental grooves. .The kneading andr working into or through the openingmup tothe point of to which the >material issubjected causes such the locking groove 33e. The edge of the sheet material to be ñrmly compacted which renders metal body surrounding the opening engages in the article dense and strongy and vexpels air bub.. thellockingV groove 33c'to'retain the bumperin bles therefrom which wouldvotherwise make the position wíththe head> 33a' thereof formingl an 35 article porous and weak. rIfhe resulting article insulating body’and bumper element. produced by the molding operation is of a homo The'grooves 3|-and 32'infthe adjacent faces of 'geneous nature and is> ofA a strongl‘and durable the stationary and movable mold members II character usually having-fa high tensile strength. and I2 are‘of ka shape'ior contour corresponding 'I’he mold can beheatedor cooled tothe desired with the shape or proñle of the article 33 to be extent during the molding operation, by supply produced, that is to say, each of these grooves ing appropriate medium to the passages of the includes a section correspondingwith the round mold members >II and I2.as above explained,- so ed headw33a, a section corresponding with the as to` obtain adesired curing, hardening or other taper stem`33b>and a section corresponding with treatment of. the stock being worked. The extent the tail 33d. The mold members> are construct- i to which the mold is heated orcooled- during ed and'arranged so that -.thegrooved faces4 there _the molding operation will dependen the require of operate- in relativelyV close relation to each ments and characteristics of the particularplastic other and form the annularly extending »mold material being used and the characteristics de chamber‘îitl.> "It is-necessary that there be some sired in thearticles being produced. clearancel between themovable andV stationary As the» molding operation progresses during the mold members such as the annularly extending rotationof the drum I2 within-the ring. member clearance spaces 32!V and 35 shown in the draw I I the articles 33 travel aroundrthefmold recess ing but which may vary in width according to 33 in a direction away from .the »feed opening the requirementsïof the particular molding ap and toward the discharge opening 3l or, inrother paratus being used or material. being molded. words, advance along `vthe moldïrecess ina clock The lower portion> of the stationary mold mem wise direction as seeinA in Fig. l. The pressurel to ber H is of a relatively wider construction than whichthe stock. is subjected duringethe mold the-upper portion thereof as> can be readily seen from Fig. 2 of the drawing. ' This relatively Wider construction for the lower portion of this 60 mold member enables the same to be provided with a discharge opening 3l through which the molded articles can drop by gravity from the ap paratus. At a point adjacent the discharge open ing.' 31', the stationary mold member II is alsol provided with. a feed opening 38r leading int-o the annular mold chamber 30 and through which theleading end of a strip or stream 39 of rubber or other suitable plastic stock can be inserted. ' .Sections or blanks having an appropriate 70 I length and‘volume‘of material, such as the blank 39ashown in Fig. 3 can besevered from the lead ing end of the strip 39 as by means Yof a cutter 40. Such a cutter canibe pivotally‘mounted on a projection> or boss 4| of the stationary mold ing operation causes any excess material to .be squeezed :from the mold recess as flash45 through the clearance spaces 34 and 35. Since the articles being formed are articlesv of revolutionv the flash 45 is usually in the form of threads orY strings of plastic material- extending from the _headl and tail of the article being formed, as shown in Figs. It is desirable tol trim the iiash 45 from the articles 33 and in accordance with the present invention such trimming is accomplished before thearticles arrive at ythe discharge opening' 3l. For this purpose I' provide the »apparatus'with a trimming means comprising a pairl of'trim'ming rolls 46 and 41 which are rotatably mounted on the stationary mold member Il just ahead ofi the discharge opening 31,. These trimming rollsfhave peripheral cutting edges which cooperate lwith aiiioßïa the drum so »as ` to severl the .dash portiorisltâ` e'I means on said drum member and engageabîle‘v with. from. the articles asfthe >articles pass between the said cutter' for producing said strip-cutting move ment, and a ,trimming means rotatably mounted onÍsaid' ring V'member adjacent said discharge mentiof their cuttingportions thè’rzrevvith.V _ opening and having a cutting portion engaging said drum memberfor trimming the‘molded ar drum and the trimming rolls. ' The trimming rolls are driven. by the drum l2 `by the engage-> , »In the event that any of the articles 33 tend to adhere to the surface of the drum 12 at the endfof the-molding operation theyl can >be dis-A tioles as they approach the discharge opening. ,_ v2. In apparatus for molding plastic material, `a ring member having a circumferential groove lodged therefrom by means of a stripper 49 pro 10 therein, a drum member rotatable in said ring vided in the discharge opening 31. This stripper member and also having a circumferential> groove unaybea finger-like member mounted on the therein, the> grooves of said ring and Vdrum mem stationary mold member I_l so as to extend into' bers cooperating to define a circumferentially ex adjacentrelation‘to the surface `of the movable . tending mold chamberof _ ` a cross-sectional shape mold member Il for scraping or pushing the corresponding ‘substantially with the proñle of the' molded articles from the latter should this be . article to be produced, said ring member having a necessary to cause such articles to drop freely feed opening communicating with said chamber through the discharge opening 31. at one point thereof for introducing said material The extent to which the material is subjected in strip form and having a discharge opening to compression during the molding operation will communicating with said chamber at another 20 depend upon the characteristics of the material point thereof for the delivery of the molded ar being Worked and the requirements of the articles ticles, means for rotating said drum member for being produced. In some cases, the pressure rolling a body of said material in said chamber to applied will be only sufficient to cause the mate shape the body to article form and advance the rial to be properly distributed in the mold recess same toward said discharge opening, a pivoted 25 to fill out the profile of the article being formed. cutter adjacent to and movable transversely of In other cases, additional pressure may be neces said feed opening for severing a body of said ma sary to obtain the desired characteristics or qual terial from a strip being fed, a spring acting on ities in the articles. Any desired amount of said cutter for moving the same in a direction to pressure can be obtained by imparting an appro uncover said feed opening, and projecting means priate taper to the groove of the stationary mold 30 on said drum member and engageable with said member Il such that the depth of the groove de cutter during rotation of the drum member for creases progressively and subjects the article to moving the cutter in a direction to sever the strip. increased pressure as theY article is rolled and 3. In apparatus for molding plastic material, a advanced along the mold recess 30. 35 ring member having a circumferential groove From the foregoing description and accom therein, a drum member rotatable in said ring panying drawing it Will now be readily understood member and also having a circumferential groove that I have provided an improved apparatus for therein, the grooves of said ring and drum mem bers cooperating to define a circumferentially ex rapidly and economically producing molded arti cles from plastic stock. . l 40 tending mold chamber of a cross-sectional shape corresponding substantially with the profile of While I have illustrated and described my the article to be produced, said ring member hav molding apparatus in considerable detail, it will ing a feed opening communicating with said be understood, of course, that I do not Wish to chamber at one point thereof for introducing said be correspondingly limited but regard my inven material and having a discharge opening com tion as including all changes and modifications municating with said chamber at another point coming within the spirit of the invention and the thereof for the delivery of the molded articles, scope of tbe appended claims. means for rotating said drum member for rolling I-Iaving thus described my invention I claim: a body of said material in said chamber to shape 1. In apparatus for molding from plastic ma the body to article form and advance the same terial elongated articles of revolution of the kind toward said discharge opening, said drum and having a body which includes stem and shoulder portions, a ring member having a circumferen tial groove therein, a drum member rotatable in said ring member and also having a circumferen ring members having cooperating portions defin ing a clearance space which communicates with said mold chamber, and trimming means rotat ably mounted on said ring member and having a tial groove therein, the grooves of said ring and 55 cutting portion engaging said drum member ad drum members cooperating to define a circumfer jacent said discharge opening for trimming from entially extending mold chamber having a cross the molded articles excess material which is dis sectional shape Which is elongated transversely of placed through said clearance space. the groove and corresponds substantially With 4. In apparatus for molding plastic material, the profile of the article to be produced, and said 60 a ring member having a circumferential groove grooves having connected coextending portions therein, a drum member rotatable in said ring of diiferent depths spaced transversely of the member and also having a circumferential groove grooves for forming the stem and shoulder por therein, the grooves of said ring and drum mem tions of the articles means for rotating said drum member for rolling a body of said material in said 65 bers cooperating to define a circumferentially ex tending mold chamber of a cross-sectional shape chamber to shape the body to article form, said corresponding substantially with the profile of the ring member having a feed opening disposed lat article to be produced, said ring member having erally of its groove and extending in the direction a feed opening communicating with said chamber of the axis of the drum and communicating with at one point thereof for introducing said material said chamber at one point thereof for introducing in strip form and having a discharge opening said material in strip form and said ring also hav ing a discharge opening communicating vvith said communicating with said chamber at another chamber at another point thereof for the deliv point thereof for the delivery of the molded ar ery of the molded articles, a cutter pivotally ticles, means for rotating said drum member for mounted on said ring member for strip-cutting 75 rolling a body of said material in said chamber movement transversely of said feed opening, 8 n to‘shape the body to article form and advance chamber at one point thereof for introducing said material in strip form and having a‘discharge opening communicating with said chamber at movalolyv mounted on said> ring member adjacent said lfeed `opening for severing bodies of material in` succession from a strip being fed, and means on saiddrum for actuating saidcutter. 5. In apparatus for molding plastic material, a ringA member having a circumferential groove another point thereof lfor vthe delivery of the molded articles, means for rotating said drum member for rolling a body of said material in said chamber to shape the body to article form therein, a drum member rotatable in said ring member .and also having a circumferential groove therein, the grooves of said ring and drum mem . havinga Afeed opening communicating Withsaid the same towardsaid discharge opening, a> cutter7 19 bers cooperating to define a, circumferentially extending mold chamber of a cross-sectional shape corresponding substantially with the proñle of the article to. be produced, said ring member la and advance> the same toward said discharge opening, and trimming rolls mounted on Ysaid ring member and cooperating with said drum for trimming the molded articles as they approach said discharge opening. ' ' ` ' ` HAROLD A. s'roRcH.