Sept 10, 1946- 1.. v<2. ZESBAUGH ‘ _ 2,407,465 .METHOD AND APPARATUS FOR MAKING CAPS 0R COVERS Filed July 8, 1942 ~ 3 Sheets-Sheet l . ' \\ ' lnveni‘gr' Sept. EQ, 1946. L. G. zEsBAUGH :METHOD AND APPARATUS FOR MAKING CAPS 0R COVERS Filed July 8, 1942 2,407,465 5 Sheets-Sheet 2 if» 28% ' 2821 - :::::t? 24 I 36 Q"gwmazi?mwll ' By K47’? - )‘T ‘t ‘to F7163. ‘ Sept 1% 1946. 1.. <5. ZESBAUGH METHOD AND APPARATUS FOR MAKING CAPS OR COVERS Filed July 8, 1942 Am WW. \ Mi W 2,407,465 3 Sheets-Sheet 5 iv Inventor . J?? v Patented Sept. 10, 1946 2,402,455 panes stares rarest @EE'lQE 2,407,465 METHOD AND APPARATUS FOR MAKING CAPS on COVERS Lawrence G. Zesbaugh, Minneapolis, Minn, as signor, by mesne assignments, to Perma-Seal Closure 00., a‘ corporation of St. Paul, Minn. 1 Application July 8, 1942, Serial No. 450,140‘ 7 Claims. (CI. 93-13) 2 This invention relates to a method and appa- ~--' Fig. 8 is a central vertical section through the ratus for making a cap or cover for a‘ container, dies shown in Fig. 6 in a different arrangement and particularly for making a cap or cover for a and in closed position; cylindrical container such as a milk bottle. Fig. 9 is a horizontal section taken on line 9—9 It is desirable in a cap for such a container to of Fig. 8; ‘ a have one that is suf?cientiy rigid‘so that it can > Fig. 10 is a bottom plan View of the ?nished be handled and placed on the container without cap; being distorted and one that will ?t the contain er tightly and form a tight closure therefor. Fig. 11 is a central vertical section through the cap showing the same on a container which is It is also desirable to have a cap or cover shown in dotted lines; and which ?ts along both the inner and outer side 1.0 Fig. 12 is a horizontal section illustrating a die of the container. , and blank carrying turret. It is an object of- this invention therefore, to Referring to the drawings an apparatus is provide a method and apparatus for making a shown for carrying out the method of the inven cap which is strong and which makes a tight ?t 15 tion comprising a female die l5 carried on a on the container. plunger !5a and having a cylindrical recess l5b It is a further object of the invention to pro at its underside. Die i5 cooperates with another vide a method and apparatus for making a cap die it having a shallow cylindrical recess lBa in or cover from a sheet of paper-like material in its top surface. Die I 6 has a depending cylindri Which the sheet is bent and formed as desired 20 cal portion I61) ?tting in openings Ila of a sta Without undue strain or tearing of the material. tionary frame member ll. Rim l?b carries and It is another object of the invention to pro is supported by a plurality of pins l8 illustrated vide a method and apparatus for making a cap or as three in number, which extend downward cover of paper~like sheet material,’ which cap or through the openings Na and are supported up cover will ?t closely on the inner and outer sides 25 on a plate [9. Plate H! has a central hub i911 of the container. receivable in and substantially ?tting within the It is more speci?cally an object of the inven inner side of a compression coiled spring 20 sup tion to provide a method and apparatus for mak ported at its lower end upon a plate or collar 2!. ing a cap or cover from a sheet of paper-like ma Collar 2| has a central hub 2Ia ?tting within terial adapted to ?t a substantially cylindrical 30 spring 20. A nut 22 engages the lower side of container, which cap or cover ?ts closely on the » plate 2! and can be'adjusted to vary the tension inner and outer sides of the container top and of spring 20. Nut_22 is threaded upon the lower which is strengthened by a bead or ridge formed threaded end of a plunger 23a secured to a male about the top thereof. die 23 having an upper cylindrical portion of a These and other objects and advantages of the diameter to be received in recess I52) and of invention will be fully set forth in the following slightly smaller diameter than said recess. Die description made in connection with the accom 23 ?ts within a cylindrical recess in memberv l6 panying drawings in which like reference char and has a‘ reduced portion 23b extending through acters refer to similar parts throughout the sev and below member l6 and resting on frame eral views and in which: Fig. 1 is a vertical central section through cer tain dies which are ?rst used; Fig. 2 is a partial view similar to Fig. 1 shown on an enlarged scale and showing the dies in a di?erent position; Fig. 3 is a horizontal section taken on line 3--3 of Fig. 1 as indicated by the arrows; Fig. 4 is a plan view of the blank used; Fig. 5 is a plan view of the blank after having the ?rst operation performed thereon; 40 member H.‘ A further reduced portion 230 ?ts in and may be secured in frame member _|‘!. Plunger 23a depends from portion 230, having a reduced portion threaded thereinto. It will thus be seen that male die 23 is stationary. The re 45 cess IBaV is adapted to have placed therein a flat circular blank 24 from which the cap or cover is made. The ?rst step of the method is carried out in the dies shown in Figs. 1 to 3. _ In Fig. 6 an upper die assembly is shown com prising an annular member 21 having a lower . annular portion 21a of reduced thickness. Mem Fig. 6 is a vertical section through certain dies used; the same being shown in open position with her 2? is internally threaded and a plunger mem the object to be operated on therein; ber 28 has a threaded shank 28a ?tting in mem Fig. 7 is a partial view similar to Fig. 6 showing ber 21. As illustrated, the lower end of plunger the dies in closed position; 55 28 is of a diameter slightly less than the inner 2,407,465 3 liameter of portion 210. and member 28 has a re 4 member I6 is depressed and moved downward duced portion between its lower end and the against the tension of spring 2!}. The male die 23 remains stationary and the female die 55 threaded shank 28a. Member 2's‘ is secured to a vertically movable member 23 by a plurality of circumferentially spaced screws 30 shown as therefore, moves downward around the same to the position shown in Fig. 2. The blank 24 is thus having their'heads countersunk in member 29. Member 29 is carried on a plunger 29a. Mem 2. When die I5 is again elevated the blank due to the resiliency of the material assumes the ber 23 has a recess in its lower portion adjacent shape shown in Fig. 6 so that the cup or cup member 2'5 and member 28 has a cylindrical ' like portion formed at its central part is of frusto molded or formed in the dies as shown in Fig. shank 2% extending into said recess. Shank 10 conical form. The blank 24 is now placed in 281) has a radial hole 28c adapted to receive the position over the member 3.3 as shown in Fig. end of an operating tool for turning member 28. 6. The blank now has a flat annular rim at its Member 28 is shown as having a passage 28d of outer portion and this rests upon the upper end comparatively small diameter extending central of member 4!. The upper die assembly is now ly thereof and the same extends laterally in por 15 moved downward and annular die Zla. descends tion 28b and has connected thereto a pipe or con in line with and centrally of annular member duit 3|. Passage 28d at its lower end communi 40. The lower end of plunger 28 engages the cates with radially extending passages 28c which top of the blank 24 and holds the same flat extend to the outer side of the reduced portion against the top of member 35. Members 23 and above the lower end of plunger 28. Said upper 20 Z‘la. move downward together and annular mem assembly is adapted to be vertically reciprocated ber 40 is depressed with members 3% and 39 by suitable means attachedto plunger 29a. A against the tension of spring 35 so that an lower die assembly is also shown in Fig. 6 com nular portion Ela. moves downwardly within prising a stationary frame member 33 through member 4| as shown in Fig. '7. There is suffi which extends a cylindrical passage 330.. A plate 25 cient room about annular member 21a when it 34 is supported on frame member 33, the same is within member 4| so that the material can having a central recess 34a in its top side and a draw downwardly around the lower end thereof central passage 34b of comparatively small di without undue strain or tearing to bring the ameter extending therethrough. A compression blank to the form shown in Fig. 7. The ?at an coiled spring 35 has its lower end resting on the nular rim on the blank has now been turned bottom of recess 34a and supports at its upper downwardly to form an annular ?ange and an an end a member 33 having a frusto conical top sur nular groove is thus formed about the under face. Member 35 also has a reduced lower por side of the blank. Air is supplied through the tion Sta received in the upper end of spring pipe 3| and passes out through passages 23c and 35. A pipe or conduit 31 extends through pas 35 downwardly around the lower die assembly and sages 33a and 34b and is secured in the upper prevents the blank from being lifted by the up end of member 35, the same having an upper end per assembly when the latter is raised. disposed at the top of member 35. Member 36 The third step in the method is performed supports on its top surface a die 39 having a flat with the dies in the position shown in Fig. 8. top surface and a cylindrical periphery. Mem 40 Plunger 28 has been lowered some distance below ber 39 is hollow or internally bored and members the position it occupied when the second step 35 and 36 are disposed within the inner side of the method was performed on the blank. The thereof. Member 39 has in its cylindrical pe blank is now in position with the central cup riiohery adjacent its top, an annular groove 3911.. like portion ?tting over the upper end of meme Member 39 has an annular projection 3% at its 45 ber 39. The upper assembly which has been lower end forming an annular shoulder or ledge raised is again lowered and the top of the blank on which is supported an annular member All. is held in ?at condition between plunger 23 and In its normal non-operative position as shown in the upper surface of member 39. As the upper Fig. 6, the top of member Gil is substantially flush assembly moves downward members 39 and 43 with the top of an outer stationary member 4| 50 move downwardly against the tension of spring 35. Member 46 comes to rest seated against the within which member 4a”! ?ts and within which it ' is movable with member 35. Member 4! is sup top of the boss 340 as shown in Fig. 8 and this is ported upon a boss 34c on the top of plate 34. the same position it occupies when depressed for The second step of the method of the invention the second step on the blank. Member 39 how is performed in the die assembly shown in Figs. 55 ever is not stopped but moves downward into the recess 34a as shown in Fig. 8 and it now 6 and '7. In Fig. 8 another die assembly is shown. occupies a position lower than the position it While this could be separately made and be an occupies when depressed for the second step. It entirely separate unit from the structure shown moves through an additional distance equal to in Figs. 6 and '7, it may also be formed by the the distance that plunger 28 was lowered by change in the position of the upper die assembly turning thereof. The distance between the top shown in Fig. 6. A tool can be inserted in hole of member 40 and the bottom of member 23 has 280 and member 28 rotated through a partial therefore been reduced and the depth of the revolution to bring member 28 to a lower posi blank or cover will thus be reduced. The groove 39a in member 39 is now disposed substantially tion in die 21a. In the embodiment illustrated in line with the top of member 40. When the the structure is the same therefore in Fig. 8 as blank is thus reduced in depth it is compressed in Fig. 6, except that member 28 is in a posi and the material is squeezed into groove 39a and tion about 111 of an inch lower than the position this forms a tight or sharp bead or ridge about it occupies in Figs. 6 and '7. In carrying out the ?rst step of the method 70 the lower inside corner of the blank as seen in Fig. 8. This has the effect of stiffening the the flat circular blank 24 which is made of rather cover and the outer ?ange of the blank or cover stiff paper-like material is placed in the recess is again pressed into the dies and ironed so to I6a. Die I5 is then moved downward and the speak, so that it is pressed ?rmly into place. The blank 24 is engaged ?rst by the lower annular dies shown in Figs. 6 and 7 and in Fig. 8 are 75 portion of die l5. As die l5 moves downward 2,407,405 heated so that a good ironing e?'ect is produced. The dies shown in Figs. 1 and 2 have been used in a non-heated condition. When the upper die assembly as shown in Fig. 8, is raised, the blank will be helddown on the lower assembly as above described. When the upper assembly has moved upward a blast of air can be turned by a suitable valve through pipe 31 and this lifts and dis taneously and all operate on the covers. Several operations'would thus be performed at once. The operators removing and placing on new covers at positions 500 and 50f could work in perfect safety as no upper dies are located at those positions. A very rapid production of the covers would thus be possible. ‘ From the above description it will be seen that I have produced a simple method and apparatus charges the blank from the lower die assembly. The blank has now been brought to ?nal form 10 for making a very e?‘icient cap or cover for a con and the cap or cover is in ?nished condition. The outer ?ange is substantially cylindrical in tainer. The successive steps are necessary on the blank in order that it be properly molded and form although it may have a very slight ?are. drawn without damage or tearing. It would not This would assist in placing and ?tting it on top be possible to bring the cover to ?nal form with of the container 44 as shown in Fig. 11. The 15 just one operation. The dies are so arranged central cup-like portion of the cover ?ts down that the edge of the blank can be drawn in to give tightly within the container 44 so that a seal is the desired bends and shape. The heated dies act obtained at the inner side of the container across to press and iron the cover so that the ?nished the top thereof and at the outer side. The com cover is of properv and desired shape and will pleted cover designated 24a, has the bead or rib 20 retain such shape. The covers can he very rapidly 241) formed at the top of the cup-like depression produced and constitute a very e?icient closure therein or at the inner corner of the annular for the container.v The cover ?ts tightly on the channel of the cap. This as stated, sti?ens the container and will not be removed by liquid in the cap and assists in holding the same in the de container engaging the same. sired form. A simple and yet very efficient cap 25 The method and apparatus have been amply or cover has been produced. demonstrated in actual practice and found to be In making a machine to produce the covers in very successful and veiiicient. large quantities 9, turret 50 such as shown in Fig. It will of course, be understood that various 12,v could be used, and this would be revoluble changes made in the form, details, arrange about a central shaft 5| as indicated by the 30 ment andmaybe proportions of the apparatus and in the arrow The. circles shown on the ?gure would steps and sequence of steps of the method with represent die assemblies, particularly the lower out departing from the scope of applicant’s inven portion of the die assembly shown in Fig. 1. The tion, which generally stated, consists in a method turret would be rotated intermittently 1/6 of a revolution. The said turret would be used to 35 and apparatus capable of carrying out the objects above set forth, such as disclosed and de?ned perform the second and third operations on the in the appended claims. cap. The lower die assembly shown in Figs. 6, What is claimed is: 7 and 8 would be located at the circles shown on 1. A method of making a cap or cover for a the turret. At position 50a the upper die as sembly as shown in Fig. 8, would be located. 40 container for food or other material which con sists in pressing a circular flat blank of sheet There would be no upper die at positions 500 and material such as cardboard or comparatively thick 50)‘. At position 5901 the upper die assembly paper at its central portion to form a cup therein shown in Figs. 6 and 7 would be located while at with a ?at circular rim thereabout, then pressing position 50c the upper die assembly shown in Fig. 8 would be located. The turret 50 would 45 the outer part of said rim into frusto conical shape to form a down turned ?ange extending for some thus movably carry the lower die assemblies and distance from the top of said cup, thus forming the paper blanks placed thereon while the upper an annular groove around the underside of said die assemblies would be stationarily located cover which groove has substantially parallel sides about the turret and co-act with the lower dies as the same come into alignment therewith. The 50 and which is adapted to receive the top of said container, then compressing said cup vertically covers in the form shown in Fig. 6 would be and forming a bead or ridge about the top of said placed on the die assembly at the position 50)‘. cup to stiifen said cover and forming the whole of The turret would then move to bring this into said outer ?ange into substantially cylindrical position 50a. _Here the upper die assembly shown in Figs. 6 and '7 would descend and per 55 form. form the second operation on the cover. The turret would then move and the cover be brought to the position shown at 50b. Here the upper die assembly as shown in Fig. 8 would descend and perform the ?nal operation on the cover. The cover would then be moved by the turret to position 560 and here the same would be re moved from the dies. Another cover as shown in Fig. 6, would be placed on the lower die and the second and third operations would succes sively be performed thereon at positions 50d and 50e. The cover would then be moved to posi tion 58f where it would be removed from the dies and another cover as shown in Fig. 6, placed in position. Operators .would be located at posi tions EM and 500 and the caps as shown in Fig. 6, would be continuously and successively placed on the lower die assemblies as they stopped at said positions. The upper die located at posi tions 50a, 50b, 50d and 50e would descend simul 2. A method of making a cap or cover for a container which consists in providing a ?at circu lar blank of paper-like sheet material, pressing a cup-like depression in the central portion thereof, then pressing the entire outer edge portion of said blank to form an outer downturned ?aring ?ange thus forming an annular groove having substantially parallel sides adapted to receive the top of said container, and then pressing said cover to form a sharp bead or ridge about the top 65 of said cup and decreasing the depth of said cup. 3. A method of making a cap or cover for a container which consists in pressing a ?at circular blank of sheet material such as cardboard or stiff paper between dies to form a- cup-like depression in the central portion thereof, pressing the same between dies to form the entire outer part of said blank into a downturned annular ?ange thus forming an annular groove having substantially parallel sides, which groove is adapted to receive 75 the top of said container, then pressing the same 8 betweendiesio :reducethe depth of?said cup-like udepressionandform a sharp bead orridge. about 1 the top edge of said cup and bring said ?ange into substantially cylindrical form. 4. An apparatus ‘.for forming a ,capror cover. having in combination, means for forming a cup like depression in the central portion of a flat circular one-piece blank of sheet material, means ' for turning down a portion of said blank extend ' G‘HThe. method of‘ making a cap or .coverior a a container which consists in pressing a flat sub » stantiallycircular blank of paper-like sheet mate .rial between dies to form a cup-like depression in'the centralv ,portion thereof, holding the cen ~ tral portion of said vblank in ?at condition and then pressing the same to form the entire edge portion of said blank into cylindrical form spaced from and extending about said depression to form an annular groove adapted to receive the top of ing from its outer edge inwardly a substantial 10 said container and then again pressing said blank distance to form an annular ?ange and thus form to form an inwardly extending sharp bead or an annular groove having substantially parallel - ridge about. the top inner corner of said groove to sides at the underside of said blank and means strengthen said cover. for forming a bead or ridge about the top of said '7. An apparatus for forming a cap or cover for cup-like depression or at the inner corner of said a container having in combination, means for ' groove. forming a cup-like depression in the central por 5. The method of making a cap or cover for a tion of a flat circular one-piece blank of paper-like container Whichconsists in pressing a one-piece sheet material, means for forming the edge por substantially circular blank of paper-like mate tion of said ‘blank into annular form about and rial having considerable resiliency to form a cup-l 20 spaced from the Wall of said depression, thus like projection at its central portion with a flat forming an annular groove adapted to receive the rim thereabout, then pressing said rim including toplof said ‘container and means for-compressing - the entire outer portion .of said blank into cylin said blank having therein a small annular depres drical form to extend along but spaced from said sion into which the upper inner corner of said projection to form an annular groove adapted: groove is pressed inform a sharp bead or ridge to receive the top of said container and then about said corner to strengthen said cover. pressing said blank to form an inwardly extending pinched bead about the upper inner corner of said annular groove to strengthen said cover. LAWRENCE / G. ZESBAUGH.