US3902627A - Easy open end - Google Patents

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Publication number
US3902627A
US3902627A US478407A US47840774A US3902627A US 3902627 A US3902627 A US 3902627A US 478407 A US478407 A US 478407A US 47840774 A US47840774 A US 47840774A US 3902627 A US3902627 A US 3902627A
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US
United States
Prior art keywords
section
tab
closure member
tear line
panel
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US478407A
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English (en)
Inventor
Gordon R Gane
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Kaiser Aluminum and Chemical Corp
Original Assignee
Kaiser Aluminum and Chemical Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kaiser Aluminum and Chemical Corp filed Critical Kaiser Aluminum and Chemical Corp
Priority to US478407A priority Critical patent/US3902627A/en
Priority to AU77960/75A priority patent/AU482471B2/en
Priority to DE19752507033 priority patent/DE2507033A1/de
Priority to JP50025867A priority patent/JPS50122384A/ja
Priority to FR7506612A priority patent/FR2263160B3/fr
Priority to US05/565,494 priority patent/US3964414A/en
Application granted granted Critical
Publication of US3902627A publication Critical patent/US3902627A/en
Assigned to MELLON BANK, N.A., AS COLLATERAL AGENT reassignment MELLON BANK, N.A., AS COLLATERAL AGENT SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KAISER ALUMINUM & CHEMICAL CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
    • B21D51/383—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures scoring lines, tear strips or pulling tabs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B65D17/28—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness
    • B65D17/404—Details of the lines of weakness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2205/00—Venting means

Definitions

  • closure member is provided with readily depressible and hinged opening tabs or 52 11.5. C1 220/268; 222/541; 229/7 R buttons, that do not readily Separate from the closure 51 Int.
  • This invention relates to easy open metal container end closures or closure members and particularly to those provided with preformed tabs that can be pushed in manually to gain access to the contents of the container to which an end closure is attached. Upon being pushed in, the instant tabs do not become readily separated from their associated end closures to become lost and thereby further contribute to the litter problem as is the case with conventional pull ring tear tabs.
  • the most commonly used easy open devices for metal container closures attached to beverage cans and the like comprise metal pull rings or pull tear tabs. These rings or tabs become readily sepa rated from their respective container closures upon opening and unless deposited in a refuse can are frequently dropped upon the ground or overboard from a boat, to form litter as well as possible hazards to marine life, or to people walking barefoot in the areas where the tabs fall upon the ground.
  • the push button opening tab is adapted during manufacture to be first completely fractured or severed from the container closure proper except for a small hinge and then pushed back into place and sealed to the container closure proper by means of an appropriate plastic sealant.
  • plastic sealed closure tabs are difficult to make leakproof and sanitary on a mass production basis and, in any event, are still relatively expensive to produce because of the number of complex manufacturing steps and tooling involved plus the sealant materials required.
  • the instant easy open closure development is an attempt to overcome the problems of manufacture and use presented by prior art push button container closures of the type represented, for example, by the aformentioned patents and publications and the instant easy open container closure member is eminently adapted to be made out of a suitable ductile metal.
  • the closure member is provided with improved easy open button-like depressible tab elements formed integrally with the metal of the container closure in such a way as not to be completely fractured or severed from the closure proper during manufacture so as to require resealing with a plastic material or the like as in the case of the closure of U.S. Pat. No. 3,759,206.
  • Each buttonlike depressible tab of the closure member prior to opening effectively resists outward opening pressures generated by the contents of the container to which the closure member is attached. Yet the same depressible tabs are capable of being :readily manipulated and opened with a relatively small amount of force by the finger of the user and without the requirement of any special tool. Once opened, the tab remains in the pushed-in or depressed position while the contents are emptied from the container to which the closure mem-' ber bearing the tab is attached. The tab is not intended to be nor can it be readily removed from its associated container upon being depressed during opening of the container.
  • the improved, easyto-open, yet internal pressureresistant characteristics of the instant button-like depressible tabs are due to the novel structure, arrangement and angular disposition of the tabs proper and their associated base and frangible tear sections.
  • the structure, arrangement and angular disposition of the base and tear line sections of the depressible opening tabs with respect to the other portions of the tabs and their associated closure members, such as selectively embossed portions of the closure members, provide for concentration of stresses in the frangible tear line areas of the tabs during opening and resistance to internal pressures, such as are generated by the containers con tents prior to opening.
  • buttons-like elements or depressible tabs are arranged to simulate opposed intersecting geometric cone-like figures that help to selectively distribute the stresses upon the frangible tear sections to effect fracture upon depression of the tabs and resistance to fractures from the buildup of internal pressures generated by the contents of the container provided with the depressible opening tabs prior to opening.
  • means are provided, such as suitable upstanding embossments somewhat analogous to those of U.S. Pat. No. 3,450,301 on the end closure member having a depressible tab of the instant invention in order to protect the tab and prevent accidental opening of the same during the usual seaming and :sealing of the end closure member to a metal container, such as a beer or beverage can, as well as during other end closure handling and stacking operations.
  • the instant invention is concerned with improved proceses and improved equipment for producing such container closures, wherein the tooling and process steps contemplated are greatly simplified over those used in existing practices.
  • closure member or end closure as used throughout the specification and claims are meant to include closures made from all types of appropriate ductile metal materials, such as steel, tin plate, aluminum and its alloys, and other metals which are suitable for manufacturing the container closures, as well as container closures made of these metals and provided with relatively thin plastic films and coatings customarily used to protect the metal against the contents of the containers and vice versa and container closures of other than circular configurations.
  • FIG. 1 is a top plan view of an improved easy open container closure member of the instant invention
  • FIG. 2 is a cross-sectional view gnerally taken along line 2-2 of FIG. 1 and illustrates in dotted lines the normal position assumed by the pushed-in buttons or depressible tabs after they have ben forced inwardly and pivoted about their respective hinge or portions;
  • FIG. 3 is a cross-sectional view taken along the line 3-3 of FIG. 1;
  • FIG. 3A is an enlarged section of the frangible portion of the depressible button or tab of FIG. 3 when taken within the circumscribing line 3A of FIG. 3 and with parts added;
  • FIG. 4 is a cross-sectional view taken along the line 4-4 of FIG. 1;
  • FIG. 4A is a sectional view of a depressible tab similar to FIG. 4 wherein the various base, frangible and side wall sections of a tab are projected along hypothetical cone-like projection lines to indicate the unique opposed geometrical, cone-like relationships of the various elements making up the tab;
  • FIGS. 5 through 8 disclose various steps and tooling that can be used in producing a closure member provided with the improved depressible tabs and reinforcing embossment of the instant invention
  • FIG. 9 is an enlarged cross-sectional view taken within the circumscribing line 99 of FIGS. 8 and 10 and discloses the manner in which the tools produce the improved frangible tear line section of a depressible tab for the container closure of the instant invention
  • FIG. 10 is a partially fragmented sectional view of a typical press provided with the improved tools of the types shown in FIGS. 5 through 8 that can be used to produce the container closures of the instant invention;
  • FIG. 11 is a sectional view of a modified form of tooling that can be used to produce a modified form of closure member according to the instant invention
  • FIG. 12 is an end view of the fixed die part of the tooling taken along line 12-12 of FIG. 11;
  • FIG. 13 is an end view taken of the movable die portion of the tooling taken along the line 13-13 of FIG. 11;
  • FIG. 14 is a perspective view of a further modified form of end closure of the invention provided with at least one depressible tab and reinforcing and protective upstanding embossments;
  • FIG. 15 is a top plan view of the end closure shown in FIG. 14 when rotated 180;
  • FIG. 16 is a sectional view taken along line 16-16 of FIG. 15;
  • FIG. 17 is a fragmentary sectional view of a modified form of tooling shown in an open position and which can be used along with the tooling of FIGS. 9, 11-13 to produce the modified type of the end closure shown in FIGS. 14-16;
  • FIG. 18 is an end view of the fixed die part of the tooling of FIG. 17 when taken along line 18-18 thereof;
  • FIG. 19 is an end view of the movable part of the tooling of FIG. 17 taken along line 19-19 thereof;
  • FIG. 20 is a sectional view taken along line 20-20 of FIG. 18 with parts removed;
  • FIG. 21 is a sectional view taken along line 21-21 of FIG. 18 with parts removed and somewhat enlarged;
  • FIG. 22 is a sectional view taken along line 22-22 of FIG. 19 with parts removed and rotated approximately
  • FIG. 23 is a sectional view taken along line 23-23 of FIG. 19 with parts removed and also rotated approximately 180;
  • FIG. 24 is a fragmentary and enlarged plan view of the smaller push button tab of the end closure of FIG. 15 and discloses a modification thereof.
  • the improved container closure 10 of the instant invention is generally comprised of an outer peripheral reinforcing rim 12, which is adapted to be lock seamed in the usual fashion to the top of a container such as a beverage container and a central panel portion or area 14.
  • Closure member 10 is further provided with the usual lower peripheral reinforcing rib l6 and an embossment 18 of appropriate configuration, such as a hemispherical or a frustoconical configuration and which in one embodiment of the invention is disposed in the central part of panel 14.
  • a push button like element or depressible opening tab 20 located to either side of the central embossment I8 and intermediate the central embossment l8 and the peripheral rib 16 is a push button like element or depressible opening tab 20 which is operated by the finger of the user and provides access to the contents of a container provided with the closure member 10.
  • the embossment 18 has several functions. Firstly, it reinforces and strengthens the closure member panel area 14. Secondly, it reduces the flexibility of the panel area 14 by stiffening the same thereby helping to concentrate stresses in the frangible sections of the depressible tabs 20 during opening of the same.
  • the depressible tabs 20 can advantageously include primary and secondary substantially annular base portions 21 and 22 respectively.
  • Base portions 21 and 22 are preferably vertically offset and at least the tops thereof are preferably horizontally offset with respect to each other as well as being concentrically arranged and interconnected by an angularly disposed web portion 24.
  • a preferred embodiment of the invention contemplates that the inner extremity of base portion 22 merge with the bottom of the upwardly projecting wall 26 of a finger engaging dome-like section 27.
  • This dome-like section 27 can take various forms.
  • One embodiment of the invention contemplates that it be hemispherical or as indicated in the dotted lines in FIG. 4 it can take the form of a truncatcdcone.
  • the primary and secondary base portions 21 and 22 which have hoop-like strength characteristics, project'at selected angles to each other with the primary base portion 21 being inclined generally upwardly and inwardly while the secondary base portion 22 projects in a generally inwardly and downwardly direction until it merges with the bottom of the side wall 26 of dome-like section 27.
  • the web 24 joining base portions 21 and 22 includes a frangible annular tear line 24 that extends in a preferred embodiment of the invention for the major length of the web 24 until it is split by and merges with the hinge portion 25.
  • hinge portion 25 can be located closely ajacent to the central portion of the panel 14 across from or in opposition to the reinforcing rib 16.
  • the tear line portion 24' is of materially less thickness and more brittle than the adjacent base sections 21 and 22.
  • dome-like section 27 will then pivot downwardly and inwardly about hinge 25 in the manner shown in dotted lines in FIG. 2 and without normally becoming fully separated from the closure member 10.
  • the various inclined surfaces 21, 22, as well as the inclined web section 24', and the normalplane or slope of the wall 26 of dome section 27'adjacent its point of mergence with base 22 when hypotheticallyprojected along the dotted lines of F IG-l' 4A generate a pair of upwardly facing geometrically cone-like figures X and X and a pair of opposing downwardly facing geometrical cone-like figures Y and Y, various ones of which ultimately intersect each other at the several spaced points A, B, C and D around the periphery of the depressible tab 20 and C being generally the point of mergence of'dome section wall 26 with base 22.
  • tab 20 e.g. base sections 21, 22, web 24 and wall 26 considered as parts of hypothetically projected cone-like figures are of significance in the manipulation of the dome section 27 and the relative ease with which the tear line 24' is fractured when a small amount of inward force is applied to the dome section 27 by the finger of the operator.
  • tear line portion 24 of a tab 20 plus the relationship and interaction of the opposed projected cone-like figures'X, X and Y and Y, and as previously noted closure member embossment, e.g.
  • the initial force applied by the dome-like section 27 upon an inward opening movement is translated through the inclined secondary base section 22 'dire'ctly'into the frangible tear line'24' where the resultant concentration of what are believed to be primarily tensile stresses force a rapid rupture or fracture of line 24'.
  • the inward force exerted by a dome section 27 is resisted by base sections 21 and 22 then translated and rapidly converted to the aforesaid tensile stresses on the residual or tear line section 24.
  • the tear line portion 24' of web section 24 is reduced substantially in crosssectional thickness from the other cross-sectional'portions of the panel area 14 of closure member 10 by virtue of the tool forming pressures exerted on web section 24 in such a way that there is preferably a bilateral pinch scoring and substantial work hardening of the web 24 in the area of tear line 24'.
  • This work hardening results in the distorted grain structure shown schematically in FIG. 3A for the tear line 24', as the values of the relative yield and tensile strengths of this particular area 24 of the member 10 are brought relatively close together.
  • FIGS. 5 through 8 graphically and schematically illustrate in a preferred embodiment of the invention a two-step cold working process without prior annealing utilized to initially and finally shape dimples in the closure member 10 which ultimately become the embossment 18 and depressible tabs 20 of such closure member.
  • This two-step process can involve tooling of the type generally shown in FIGS. 5-8, when affixed to an overall die press 28 having two forming stations, and when of the general type shown in FIGS. 913.
  • the closures 10, which could be previously coated with an appropriate thin plastic coating can be fed intermittently and successively from the first station to the second station of press 28 during stroking of the same in a manner well known in the art.
  • the medium for feeding the closure members 10 to the different stations can comprise a standard and somewhat flexible metal webbing W indicated in dotted lines in FIGS. 10 and 11 and provided with appropriately spaced openings for receiving the closures and for intermittently moving in conveyor fashion a closure member 10 from the first station to the second station.
  • the initial forming of dimples in the metal closure member panel area 14 which ultimately become the central embossment 18 and depressible of 20 f FIG. 1 is accomplished at the first station by selectively subjecting the panel area 14 to a plurality of bulging elements, e.g. three hemispherically shaped bulging pins or punch elements 50. Two of the initially formed dimples are then each reshaped at the second station into a central dome-like section 27, and two base sections 21 and 22 interconnected by a web section 24, made up of a tear line 24' and hinge 25.
  • a plurality of bulging elements e.g. three hemispherically shaped bulging pins or punch elements 50.
  • Two of the initially formed dimples are then each reshaped at the second station into a central dome-like section 27, and two base sections 21 and 22 interconnected by a web section 24, made up of a tear line 24' and hinge 25.
  • one type of press that can be used to form the easy open closure of FIG. 1, can comprise a standard fixed base plate or platen 30 and a cooperating movable top die section 31.
  • Platen 30 is fitted with bores 32 within which is fixedly mounted bushings or sleeves 33 for receiving the locater pin elements 34.
  • Pin element 34 can, in the case of the lower die segment 35 at station l be made as part of a bulging pin 50 and as part of the bottom fixed die segment 37 in the case of station (2).
  • Upper die device 36 of station (1) that cooperates with bottom die segment 35 includes a movable die segment 40 provided with an upper spacer 42 and a series of counter-bored sections 43, 44 and 45 that form female die cavities 43', 44 and 45' at the lower portions thereof.
  • a resiliently biased centering ring 46 Surrounding the die segment 40 is a resiliently biased centering ring 46.
  • Upper die segment 40 is secured to movable die section 31 by means of the usual machine bolts not shown in FIG. and as in the case of lower die segment 35 is provided with the usual 10- cater stem or pin 34 that fits in the bushing 33 fitted in opening 32 of movable die section 31.
  • Centering ring 46 is held in place by a retainer shoulder 38 that is adapted to bottom on shoulder 39 of upper die segment and ring 46 is biased relative to die segment 40 by means of the standard spring elements 47 that fit in the several cavities 48 in the upper shoulder portion of ring 46.
  • the lower nose portion 49 of the ring will normally be advantageously maintained in an extended position with respect to the lower portions of die segment 40 containing the die cavities 43', 44' and Nose portion 49 of ring 46 is adapted to fit within the rib 16 of the closure member 10 and serves to hold the closure member 10 against the bulging pins 50 of the lower die segment 35 and to center the closure member relative to lower and upper die segments 35 and 40 at station (I during the station l forming operation.
  • Pins 50 which fit in the bores 51 of die segment 35 include base sections or shoulders 51 that fit within the counter bores 52 of the pin holder or lower fixed die segment 35. If desired or necessary, suitable spacers or shim members 54 may be sandwiched in between the press bed 30 and pin holder die segment 35 prior to locking the segment 35 to the press bed by the standard machine bolts 55. When locater pin 34 is formed integrally with a bulging pin 50, the shim 54 for such pin 50 should be apertured as noted in FIG. 10. It is to be noted that the overall press apparatus 28 is equipped with the usual cooperating bottom and top stop elements 57 and 57', which selectively limit the movement of the movable press punch portion 31 relative to the fixed base 30.
  • Station (2) of press 28 is provided with a die set comprised of lower and upper die set segments 37 and 56. Fitted within each of the twin bores 58 of lower die segment 37 is a die insert 59 that is held in place by a main bolt 60 and a side pin 61. Since each die insert 59 is similarly constructed and configured, a description of one will suffice for both. Die insert 59 is provided with a plurality of aligned bores 62, 63 and 64. Bore 62 communicates at the bottom with air holes 620 and leads at its top to a generally inverted frusto-conical surface 66 while bore 64 is threaded and adapted to receive machine bolt 60 used to anchor insert 59 to die segment 37 in the usual fashion.
  • inverted fursto-concial surface 66 merge with the annular stepped shoulder portion 68 of the die insert 59 that is of particular significance in forming the web portion 24 including the tear line 24' of a depressible tab 20.
  • stepped shoulder portion 68 is comprised in vertical cross-section of small flat base 67, a vertical wall 69 that merges with the upwardly and outwardly inclined surface 70 is followed by flat crest 72 that merges with a further downwardly and outwardly inclined die surface 73.
  • the outer edge of die surface 73 is followed by a gentle are 74 that terminates at the vertical wall of the die insert 59.
  • the upper die segment 56 which as shown in FIG. 9, cooperates with a lower die segment 37 at station (2) is likewise fitted to movable die plate 31 by a stem or pin 34, etc. in the same fashion as lower die segment 37 is attached to the bed 30.
  • Die segment 56 is encompassed in the same fashion as upper die segment 40 at station l) by a centering ring 46 and related parts similar in structure and function to the centering ring 46 for die segment 40.
  • Die segment 56 can also be fitted with a shim or washer 42 and is attached to die plate 31 such as by the bolts 73.
  • Die segment 56 is provided with twin bores 80, only one of which is shown, for receiving the die inserts 82 which cooperate with their associated lower die inserts 59 to finally shape and form the depressible tabs 20 and associated parts of panel 14 and embossment 18 of the closure member 10. Since both die inserts 82 are similarly constructed a description of one will suffice for both.
  • Die insert 82 is locked in place in bore in a conventional manner by a machine bolt 83 and a locating and turn resistant pin 84. Shim elements or spacers 86 may be used in the insert holders or bores 80 for the purpose of obtaining the proper seating of the die inserts 82 in their respective bores 80. Similar spacers 86 can be used in the case of lower inserts 59.
  • the nose portion 87 of an insert 82 is provided with a hemispherical type die cavity 88 for receiving, as indicated particularly in FIGS. 7-10 of the drawings, the initially formed dimple that later is to become the dome-like section 27 of the depressible tab or button 20.
  • Cavity section 88 is of smaller peripheral dimensions than surface 66 and opposes the inverted frusto-conical surface 66 of a lower die insert 59 while cooperating with surface 66 to finally shape a tab 20 as will be hereinafter described.
  • the segments 93 that make up plate 92 are provided with openings 94 alignable with the openings 80 for receiving the nose portion 87 of die insert 82.
  • the lower section of hemispherical cavity 88 as indicated in FIG. 9 terminates in or is bounded by an annu lar flattened surface 81 followed by an annular stepped shoulder section 96.
  • Shoulder section 96 is of particular significance in that it cooperate during bottoming of the various die elements at station (2) with the opposing stepped shoulder section 68 of the die insert 59 in the forming area Z shown in dotted lines in FIG. 9 to form the web section 24 of the depressible tab 20 made up of frangible tear line 24 and hinge 25.
  • an appropriate area of shoulder section 96 is hollowed out or notched as at 97 in FIGS. 7 and 8 to form the generally downwardly directed tab hinge 25 at the same time tear line 24 is formed.
  • Shoulder section 96 in vertical crosssection includes an upwardly and outwardly inclined surface 98 followed by a short vertical wall 100 that merges with a flat surface 102 disposed at an appropriate angle to wall 100.
  • Surface 102 merges with the vertical wall 104 of the nose 87 of die insert 82.
  • Also located in the forming area Z is the somewhat conically shaped lower downwardly and outwardly inclined surface 106 of the nose guide segment 93.
  • An annular rib 108 can project downwardly from an intermediate part of surface 106.
  • the outer periphery of surface 106 merges with the wall 110 of the pocket 112 in the nose guide segment 93.
  • All of the aforesaid elements of a die insert 82 and a guide or plate segment 93 including in particular rib 108 of segment 93 act during the stroke of the press 28 in conjunction with the tops of a die insert 59 and die segment 37 to finally shape the bases 21, 22, web 24, including its tear line 24', and hinge 25 and dome section 27 of a tab 20 including the annular recess 21 in the base 21.
  • FIGS. 11 through 13 disclose a modified set of station (2) tools that could be used in lieu of those shown in FIG. in the event the use of different diametrically sized de pressible tabs or buttons are desired in the final closure member 10 in addition to a reinforcing embossment 18.
  • the die inserts and related parts are similar to those of FIG. 10 except for size, prime numbers, to the extent practical, are used for all elements except the larger die inserts and directly related elements which are identified by double prime numbers.
  • the process for forming an improved closure member of the instant invention will now be described with particular reference to making a closure having tab designs of the type shown in FIG. 1 in a two step or two station process using tooling of the type shown.
  • a two step process is preferred because it minimizes the necessity of severe forming or cold flowing of the metal in a single operation with possible fractures and multiple rejects.
  • the end closures 10 be fed from one station to another of the press 28 by being passed across and between the opposing upper and lower die elements of each station 1 and (2) and with sufficient dwell time being allowed at each station for the respective die elements to perform the particular forming steps desired.
  • this could be done by using a web W of metal material with appropriate openings and with the individual end closures 10 being fitted inside of the openings and then moved across the dies along the path shown, for example, in FIG. 10.
  • each closure member 10 moves between the upper and lower die segments 40 and 35 at station l it would be initially engaged on the downward stroke of the press by the nose tip 49 of station l centering ring 46 as the nose tip fits within the rib 16 of the end closure 10 and acts to center the closure member with respect to the bulging stationary pins of the lower die segment 35 (see FIG. 5).
  • the die segment 40 continues to move down pins 50 and the bottoms of the walls of the various female die cavities 43, 44 and 45 engage the panel portion 14 of the end closure 10 and act to draw or force the several selected areas of panel portion 14 to move or bulge slightly upwardly into the die cavities 43', 44 and 45 to form the shallow central embossment 18 and side buttons or dimples of FIG. 6.
  • the starting material or end closure 10 of an approximately 2% inch diameter were made of a readily ductile and workable aluminum alloy of the appropriate hardness or temper such as a 5l82 aluminum alloy, the number designated for the same by the American Aluminum association, and of about a hard temper, e.g. H26 temper and of an initially 0.013 inch thickness or gauge, the reduction in the thickness during the first forming step of the central embossment l8 and side dimples 120 may at the most be on the order of about 0.002 inch and then substantially all such thinning taking place in the crests of the dimples 120 and embossment 18.
  • the dimples and embossment all are formed in a symmetrical fashion and in the case of where similarly shaped and sized dimples 120 for final depressible side button-like elements 20 are used, they are preferably spaced equidistant from and on either side of the centermost embossment 18 as they are subjected to the relatively gentle outward bulging or drawing pressures of pins 50.
  • the closure is released from the die elements of station (1) in a manner well known in the art as press 28 opens and then passed by conveyor web W on to the die set of station (2) as an additional end closure 10 is introduced simultaneously to the die set at station (1 so that it can be initially worked simultaneously with the reworking of the first mentioned die closure now at station (2).
  • centering ring 46 of station (2) When the partially formed end closure 10 enters station (2), it is initially engaged by the spring biased centering ring 46 for station (2) which surrounds the upper die segment. Centering ring 46 of station (2) upon its nose portion becoming seated in the rib 16 of the end closure 10, when press platen 31 moves down, operates to center and hold the end closure with respect to the tool elements at station (2).
  • the partially formed embossment l8 fits freely within the central cavity portion or space 125 of the upper die segment of nose elements 93 and between die inserts 82, where it remains relatively undisturbed during the further working and reshaping of the outermost peripheral portions of the side dimples 120 to form the generally concentric outer and inner tab base portions 21 and 22, etc. and final tabs of, e.g. about inch diameters and 3/32 inch heights.
  • the upper parts of the outermost dimples 120 deflect upwardly a small amount and assume the general hemispherical configuration of the upper die cavity 88, but without in a preferred embodiment of the invention becoming locked to the wall of cavity 88.
  • the preferred embodiment of the invention contemplates that the tab dome section 27 and embossment 18 should be relatively shallow and project somewhat below the top plane of rim 12 to preclude stacking problems, accidental tab openings, etc.
  • the metal of panel 14 making up the tear line section 24' of web 24 is subjected to tool pressure from both sides and becomes substantially thinner than the remaining portions 21, 22 and 26 of the final tab 20.
  • the web section 24 with the exception of hinge 25 is severely cold worked from both sides and substantially reduced in thickness such that in the case of the closure 10 having an original blank thickness of 0.013 inch, the frangible tear or residual line 24 of web 24 could be thinned to between 0.003 inch and 0.0015 inch thickness or to as low as less than one-eighth of the original thickness of such end closure blank without fracture during forming.
  • tear line section 24 is subjected to the compressive action of the tooling in the area Z of FIG. 9, it is substantially work hardened and embrittled as aforedescribed by virtue of the compressive action of the tools in contrast to the adjacent base sections 21 and 22 formed integrally with web section 24 and tear line section 24'.
  • tear line section 24' is, as indicated in FIG. 3A, also oriented preferably at about a 45 outside or exterior angle to the normal plane of the panel portion 14.
  • frangible web section 2.4 is advantageously formed by opposing indentations or bilateral scores on each side of the metal, this has the advantage of controllably cold flowing the metal in a substantially uniform fashion away from the web section 24 on both sides of the metal closure and along the entire length of tear line or residual section 24' of section 24. This also helps to minimize locking of the metal in the dies and the formation of localized or pin hole type weakened areas in the tear line section 24 which might later break prior to the time opening is desired and cause undesirable leakage of the end closure during use or otherwise interfere with the desired easy opening of tab 20.
  • the lower inclined wall 106 of a nose guide segment 93 adjacent shoulder section 98 can be provided with an annular rib 108 that impresses the small shallow annular depression 21' in base 2 1 and acts as a dam to retard and prevent excessive cold flow of metal outwardly away from lower and upper tooling shoulder sections 68 and 98 and the metal tear line section 24' of a tab 20 during the formation of the same.
  • metal in the zone R in the base 21 will form a band of more work hardened metal than in other parts of base 21.
  • the depth of the depression 21 can be controlled by the vertical length of the rib 108 and/or the amount of final downward movement of nose element 93 relative to die surface 73.
  • the final thickness of residual section 24 is determined by the amount of downward movement of nose 87 of die insert, e.g. insert 82, relative to cooperating die insert 59 and all of which can be somewhat greater or lesser than is illustrated in FIG. 9.
  • the embrittlement of the frangible tear section 24"by virture of the aforesaid cold working shaping and reshaping particularly at station (2) means that this area of the tab 20 will be susceptible to being readily fractured with but a relatively small inwardly directed force applied to dome section 27 of the finished tab 20.
  • this advantage occurs during opening of a tab 20. This concerns the fact when the score line 24' is ruptured it tends to fracture without leaving any residual burr-like materials on the outside of the closure member in the area of the tab opening that might be injurious to 'the operators fingers.
  • the frangible annular tear line would be of substantially the same thickness of its entire length, e.g. the 0.003 inch'thickness in the example given above, the thickness of the tear line 24' might be slightly tapered along its length by the use of suitable tools as indicated in dotted lines in FIG. 3A. Thus, it could be slightly thinner, e.g. 0.002" thickness, at the point directly opposite or across from the'hinge 25, such as the point P of FIG; 1, than at any'other point along its length and thickest at the points P adjacent either side of hinge 25.
  • embossments are located adjacent the central panel portion of the end closure. These embossments are adapted to be engaged by the stripper elements of a standard can end seaming tool during stripping of the sealed and seamed container from the seaming tool rather than the push button tabs to preclude accidental opening of the latter. These same embossments may, if desired, be combined with or made part of further embossments also utilized to through 13. Since the tooling of FIGS. l723 is to be used at station (I and with the overall press 28 of FIG. 10, it is to be understood that end closures 210 will be fed to press 28 equipped with the tooling of FIGS. 1 l-13 and 17-23 in the same fashion as previously described, such as by means of a web W having openings within which the end closures 210 fit.
  • an end closure 210 is comprised of the usual outer peripheral reinforcing rim 212, which is adapted to be lock seamed in a conventional fashion to the top of a container, such as a beverage container, and a central panel portion or area 214.
  • Panel area 214 is provided with the usual and at least one peripheral reinforcing rib 216 and a central embossment 218 of appropriate configuration, e.g. a shallow frusto-conical configuration.
  • embossment 218 is somewhat offset from the central axis of the end closure 210 due to the different relative sizes and location of push button tabs 220 and 220'.
  • the larger size push button tab 220 can be the depressible tab used for pouring the contents of the container, while the smaller depressible tab 220, which is adapted to be opened first, is utilized to relieve the pressure from inside the container, when the container is used to merchandise beer or a carbonated beverage, etc.
  • the position and function of embossment 218 is similar to that previously described with respect to embossment 18 of the enclosure of FIG. 1 while each of the depressible tabs 220 and 220 is likewise provided with improved base portions 221 and 222 corresponding to and generally similar in structure and function to previously described base portions 21 and 22 respectively for end closure 10.
  • Base portions 221 and 222 are offset with respect to each other as previously described as regards their counterpart base portions 21 and 22 in closure 10 as well as being concentrically arranged and interconnected by an angularly disposed web portion 224.
  • Web portion 224 is similar in structure and function to the previously described and angularly disposed web portion 24 of end closure 10.
  • web 224 includes a frangible tear or residual line 224 that can extend for a substantial part of web 224 and a hinge 225, all of which are generally similar in structure and function to the previously described residual tear line 24 and hinge 25 of the tabs 20 of FIGS. 1 through 4A. In the present instance, however, hinge 225 is shown as being located.
  • a given hinge 225 can be of a longer dimension than is illustrated in FIG. 1.
  • a push button tab such as the smaller tab 220 as indicated in FIG. 24 can have a relatively large hinge 225' of a substantial arc, e.g. to and with the frangible or residual part of the tear line 224 comprising a substantial and even a major part of web 224, e.g.
  • the tabs 220 and 220 as well as the embossment 218 can have the same basic configuration, structure and function as the press button tabs and embossments 18 previously described with respect to the end closure of FIGS. 1 through 4.
  • a primary difference, however, between end closures 10 and 210 resides in the upstanding protective embossments 227 that can be formed separately or as part of the upstanding bar or rib-type embossments 228, which in the end closure embodiment of FIGS. 14 through 16 can be arranged in a converging fashion and on opposite sides of tabs 220 and 220.
  • the height of embossments 227 which can take various shapes, e.g.
  • the rib embossments 228 provide for further stiffening of the panel closure area 214, whereby it is less susceptive to being deflected improperly or adversely during the depressing and opening of tabs 220 and 220'.
  • the reinforcing and protective embossments 227 and 228 may be arranged in the parallel fashion shown in dotted lines in FIG. 1.
  • the tooling for fabricating the end closure of FIGS. 14 through 16 includes, in addition to the station (2) tooling of FIGS. 11 through 13, the modified tooling of FIGS. 17-23 used at station (I) of press 28.
  • the tooling of FIGS. 17-23 can comprise lower and upper die segments 235 and 236.
  • Lower die segment 235 is secured by the machine bolts 55 of FIG. 10 in the usual fashion to the fixed platen 30, while upper die segment 236 is connected by suitable machine bolts (not shown) to the movable die section 31 in the same fashion, in effect, as the upper die segments 36 are removably connected to the top die section 31.
  • the lower die segment 235 is provided with a locating stem or pin 237 that is removably mounted within the bushings 33 fitted in opening 32 of the fixed die section 30.
  • the locating stem or pin 237 can comprise the lower part of and be formed integrally with central punch or bulging pin 238 used to bulge or initially form the embossment 218.
  • Punch 238 along with other differently sized punches 239 and 240 fit within the bores 241, 242 and 243 of the punch holder making up the lower fixed die segment 235.
  • Formed integrally with the punches are the shoulder elements 244, 245 and 246 on the respective punches 239, 238 and 240 and these shoulder elements fit within the overall counterbore 241'.
  • spacers or shim members 247 may be sandwiched in between the press bed 30 and the punch holder die segment 235 prior to locking the segment 235 to the press bed by the standard machine bolts 55.
  • the centering pin 237 is formed integrally with a punch 238, the shim 247 therefor should be apertured as indicated in FIG. 17.
  • the punches or pins are held within the pin holder 235 by virture of the shoulder element 250 of the counterbore 241 and, if desired, shim elements 251 may be located intermediate the shoulder 250 and the shoulder sections 244, 245 and 246 of the various pin elements.
  • the lower die segment 235 is provided as indicated in FIGS. 17, 18, 20 and 21 with a pair of raised and elongated rib or barlike surfaces 270 arranged in a somewhat converging fashion and in one embodiment of the invention extending for a substantial distance across the bottom of the die in order to provide or form the raised embossments 228 on the end closure 210.
  • the height of these bars 270 can, if desired, be equal to or slightly less than the height of the punches 238, 239 and 240.
  • At appropriate spaced points along each of these bar elements or a similar raised element is one or more beads or button heads 272 of an appropriate shape, e.g. hemispherical or frusto-conical, etc.
  • buttons 272 which form the protective embossments 227 in the final end closure 210 should be higher, eg on the order of ten to twenty thousandths of an inch higher, than the tops of the individual punches 238, 239 and 240.
  • the hemispherical or arcuate segments 272 in one embodiment of the invention can all be located at the same distance or at the same radius from the main center of the die segment 235 in order to form protective embossments 227 that are located at points on the same circle drawn from the center or central axis of end closure 210 and which would come into contact with the seam tool pushout during the seaming of the closure member 210 to a standard sized beverage can.
  • beads 272 can be formed integrally with a raised rib 270, they can also be made in the form of a removable pin 272, all as indicated in FIG. 20.
  • This pin is adapted to removably fit within an outwardly stepped sleeve holder 273 and the sleeve holder 273 is removably fitted within a stepped bore section 274 located in the appropriate portions of the die segement 235.
  • appropriate spacer or shim elements 275 may be located intermediate the sleeve 273, the pin 272 and the fixed platen 30 at the time lower die segment 235 is removably affixed to platen 30.
  • Die segment 236 cooperatively associated with lower die segment 235 at station (I) is the upper die segment 236.
  • Die segment 236 includes an apertured upper spacer member 252 sandwiched in between the upper die segment 235 and the movable top die section 31.
  • Die segment 236 is adapted to receive the centering ring 46 previously described and held in place by a retainer shoulder 38, while being biased relative to the die segment 236 by means of the standard spring elements 47 fitted in separate cavities 48 in the upper shoulder portion of ring 46, all as previously described.
  • This biasing or centering ring 46 with its nose portion 49 is usually maintained in an extended position with respect to the lower portions of the die segment 236.
  • the nose 49 of ring 46 is adapted to fit within the rib 216 of the closure member 210 in order to initially center this closure member relative to the lower and upper die segments 235 and 236.
  • the centering ring as in the case of the previous dies operates to hold the closure member 210 against the several bulging punches or pins 238, 239 and 240 of the lower die segment 235 and to maintain the desired centering of the closure member relative to the lower and upper die segments 235 and 236 at station (1) throughout the forming operations that take place at this station.
  • the upper die segment 236 further includes as indicated in FIG. 17 the main die cavities 260, 261 and 262 which cooperate respectively with punches 239, 238 and 240 to initially form the tabs 220, 220' and embossment 218.
  • Die cavity 260 can be formed as a continuation or enlargement of a main bore 263 while cavity 262 can be made up of a continuation or enlarge ment of a bore 264.
  • the upper part of the bores 263 and 264 may be adapted to receive die segment locating or centering pins 265, which also protrude through appropriate openings in the shim member 252 and with the centering pins 265, if desired, comprising the lower sections of pin elements 266 that extend through appropriate openings in and are locked to the upper movable die sections 31 in a manner well known in the art.
  • Die segment 236 is further provided as indicated in FIG. 19 with elongated and covcrging rib-like cavities 280 of the type indicated in FIGS. 19 and 23 that are adapted to cooperate with ribs and beads 270 and 272.
  • Appropriate parts of these cavities 280 can be further hollowed out or provided with counterbored sections as indicated in FIGS. 19 and 22 so as to provide the enlarged openings 282 for receiving the pin elements 272 along with that portion of panel 214 of the end closure member 210 which is to be formed into the protective and raised embossment 227 in a manner to be hereinafter described.
  • the stepped counterbores 282 are formed along with the elongated cavities 280 in the upper die segment 276, all in a manner well known in the art.
  • the second station tooling elements disclosed in FIGS. 9 and 1] through 13 can be advantageously used along with the station 1 tooling elements of FIGS. 17 through 23 to form the final closure member 210. Because of the construction and arrangement of parts for such station (2) tooling of FIGS. 9 and 11-13, suffi cient clearance will be provided in the various parts of the upper die segment 56' and its associated die inserts 82' and 82" as well as the guide and protective plate 92 to accommodate with adequate clearance the raised sections 227 and 228 on the closure member 210 formed at station (1 Further, since these raised sections 228 and 227 are completely formed at station l there is no need for any further treatment of these parts of end closure 210 at the second station.
  • the process used in the final formation of the end closure 210 at stations l and (2) can be basically the same two-step process previously described except for the formation of the protective embossments.
  • the various punch elements operate to move or draw the metal of the flattened area or central portion 214 of the end closure upwardly into the differently sized die cavities 260, 261 and 262.
  • the height of various shallow dimples that are formed by means of the tooling of FIG. 17 to later become tabs 220 and 220 could be on the order of 0.070 inch plus or minus the usual tolerances, while the height of the protective embossments 227 would be 0.080 inch plus or minus the usual tolerances.
  • the material making up the end closure 210 is controllably cold worked and controllably cold flowed during the forming operations at station 2), in substantially the same fashion as previously described in connection with the forming, for example, of the end closure of FIGS. l-4A.
  • At least the tops of the bases 221 and 222 of tabs 220 and 220' are shaped so as to be horizontally offset as well as vertically offset by the tooling at station (2) in order to help establish the desired areas of least resistance to fracture in the final tabs 220 and 220, all as previously discussed.
  • An easy open metal closure member comprised of a main panel encompassed by a rim and at least one reinforcing peripheral rib, a panel stiffening embossment means at least part of which is formed in the panel adja* cent the central portion thereof and at least one outwardly projecting button-like depressible tab formed in said panel intermediate a selected portion of the peripheral rib and the stiffening embossment means, said depressible tab being provided with selectively offset concentrically arranged and interconnected primary and secondary base sections and an outwardly projecting dome-like section, said primary base section being generally inclined upwardly and inwardly and said secondary base section projecting generally downwardly and inwardly to merge with the wall of the dome-like section and both of said base sections having hoop-like strength characteristics, and web means disposed at least in part at an angle to the normal plane of the panel and interconnecting said base sectons, said web means being comprised of an embrittled and readily frangible tear line portion that extends for a selected length of said web means and
  • frangible tear line portion of the web means the normal slope of the selected part of the wall of the dome-like section adjacent the walls point of mergence with the secondary base section and the walls of the primary and secondary base sections all when projected along hypothetical lines form opposing pairs of geometrical cone-like figures and the points of intersection of certain of the hypothetically projected lines being located bleow the plane of the frangible tear line portion of the web means.
  • An easy open metal closure member comprised of a main panel encompassed by a rim and at least one reinforcing peripheral rib, a panel stiffening and protective embossment means at least part of which is formed in the panel adjacent the central portion thereof and at least one outwardly projecting buttonlike depressible tab formed in said panel adjacent the protective embossment means.
  • said depressible tab being of a smaller height than said embossment means and also'being provided with selectively offset concentrically arranged and interconnected primary and secondary base sections and an outwardly projecting dome-like section, said primary base section being generally inclined upwardly and inwardly and said secondary base section projecting generally downwardly and inwardly to merge with the wall of the dome-like section and both of said base sections having hoop-like strength characteristics, and web means integral with said base sections and disposed at least in part at an angle to the normal plane of the panel and interconnecting said base sections, said web means being comprised of an embrittled and readily frangible tear line portion that extends for a selected length of said web means and a hinge portion, the frangible tear line portion of the web means and the normal slope of a se lected part of the wall of the dome-like section adjacent the walls point of mergence with the secondary base section when projected along hypothetical lines forming opposing and intersecting cone-like geometrical figures and said frangible tear line portion being of substantially less thickness than the adjacent
  • a closure member as set forth in claim 10 including an additional panel stiffening embossment means of less height than said first mentioned embossment means and said additional panel stiffening embossment means being located at least in part adjacent the central portion of the panel.
  • An easy open metal closure member comprised of a main panel encompassed by a rim and at least one reinforcing peripheral rib, a panel stiffening embossment means formed in a selected area of the panel closer to the central portion thereof than to said rib, a pair of outwardly projecting button-like depressible tabs formed in said panel and each tab being located off to one and a separate side of the embossment means and intermediate the peripheral rib and the embossment means, at least one of said depressible tabs being provided with selectively offset concentrically arranged and interconnected primary and secondary base sections and an outwardly projecting dome-like section, said primary base section being generally inclined upwardly and inwardly and said secondary base section projecting generally downwardly and inwardly to merge with the wall of the dome-like section and both of said base sections having hoop-like strength characteristics, said one of the depressible tabs further including web means disposed at least in part at an angle to the normal plane of the panel and interconnecting said base sections,
  • An easy open metal closure member comprised of a main panel encompassed by a rim and at least one reinforcing peripheral rib, a panel stiffening embossment means formed in a selected area of the panel closer to the central portion thereof than to said rib, a pair of outwardly projecting button-like depressible tabs formed in said panel and each tab being located off to one and a separate side of the embossment means and intermediate selected portions of the peripheral rib and the embossment means, at least one of said depressible tabs being provided with selectively offset concentrically arranged and interconnected primary and secondary base sections and an outwardly projecting dome-like section, said primary base section being generally inclined upwardly and inwardly and said secondary base section projecting generally downwardly and inwardly to merge with the wall of the dome-like section and both of said base sections having hoop-like strength characteristics, said one of the depressible tabs further including web means formed integrally with base sections and disposed at least in part at an angle to the normal plane of
  • frangible tear line portion of the web means the normal slope of the selected part of the wall of the dome-like section adjacent the walls point of mergence with the secondary base section and the walls of the primary and secondary base sections all when projected along hypothetical lines form opposing pairs of geometrical cone-like figures and the points of intersection of certain of the hypothetically projected lines in the case of said one tab being located below the plane of the frangible tear line portion of the web means.
  • An easy open metal container closure member comprised of a main panel encompassed by a rim and a reinforcing peripheral rib, a panel stiffening embossment formed in the central portion of the panel and a pair of outwardly projecting button-like depressible tabs formed in said panel, each of said tabs being located on a different side of the embossment and intermediate the peripheral rib and said panel stiffening embossment, said tabs and embossment also being sub stantially linearly aligned, each of said tabs including selectively offset and concentrically arranged and interconnected primary and secondary base sections and an outwardly projecting substantially frusto-conical section and a web means formed integrally with and interconnecting the said base sections, the wall of each primary base section being inclined upwardly and inwardly and the wall of each secondary base section pro jecting generally downwardly and inwardly to merge with the downwardly sloping wall of its associated frusto-conical section and all base sections having

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
  • Containers Opened By Tearing Frangible Portions (AREA)
US478407A 1974-03-04 1974-06-11 Easy open end Expired - Lifetime US3902627A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US478407A US3902627A (en) 1974-03-04 1974-06-11 Easy open end
AU77960/75A AU482471B2 (en) 1975-02-06 Easy open end
DE19752507033 DE2507033A1 (de) 1974-03-04 1975-02-19 Umweltfreundlicher behaelterverschluss
JP50025867A JPS50122384A (enExample) 1974-03-04 1975-03-03
FR7506612A FR2263160B3 (enExample) 1974-03-04 1975-03-03
US05/565,494 US3964414A (en) 1974-06-11 1975-04-07 Easy open end method and apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US44815774A 1974-03-04 1974-03-04
US478407A US3902627A (en) 1974-03-04 1974-06-11 Easy open end

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US44815774A Continuation-In-Part 1974-03-04 1974-03-04

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US05/565,494 Division US3964414A (en) 1974-06-11 1975-04-07 Easy open end method and apparatus

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US3902627A true US3902627A (en) 1975-09-02

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US478407A Expired - Lifetime US3902627A (en) 1974-03-04 1974-06-11 Easy open end

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US (1) US3902627A (enExample)
JP (1) JPS50122384A (enExample)
DE (1) DE2507033A1 (enExample)
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3967751A (en) * 1975-06-13 1976-07-06 Kaiser Aluminum & Chemical Corporation Easy open end
US4003494A (en) * 1976-01-14 1977-01-18 Aluminum Company Of America Sheet metal container component
US4350260A (en) * 1979-07-26 1982-09-21 Prueher Andrew B Lid for drinking containers
US4513873A (en) * 1981-09-28 1985-04-30 Rudolf Klaschka Capacitor can housing, process and apparatus for its manufacture

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3227304A (en) * 1964-09-08 1966-01-04 Charles T Ashury Can opening arrangement
US3246791A (en) * 1963-08-12 1966-04-19 Charles T Asbury Can-opening arrangement
US3362569A (en) * 1964-08-24 1968-01-09 Joseph A. Geiger Container closures with breakable openings

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3246791A (en) * 1963-08-12 1966-04-19 Charles T Asbury Can-opening arrangement
US3362569A (en) * 1964-08-24 1968-01-09 Joseph A. Geiger Container closures with breakable openings
US3227304A (en) * 1964-09-08 1966-01-04 Charles T Ashury Can opening arrangement

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3967751A (en) * 1975-06-13 1976-07-06 Kaiser Aluminum & Chemical Corporation Easy open end
US4003494A (en) * 1976-01-14 1977-01-18 Aluminum Company Of America Sheet metal container component
US4350260A (en) * 1979-07-26 1982-09-21 Prueher Andrew B Lid for drinking containers
US4513873A (en) * 1981-09-28 1985-04-30 Rudolf Klaschka Capacitor can housing, process and apparatus for its manufacture

Also Published As

Publication number Publication date
FR2263160B3 (enExample) 1977-11-10
JPS50122384A (enExample) 1975-09-25
DE2507033A1 (de) 1975-09-11
AU7796075A (en) 1976-08-12
FR2263160A1 (enExample) 1975-10-03

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