US3781972A - Method of securing a pull ring to an easy opening can end - Google Patents

Method of securing a pull ring to an easy opening can end Download PDF

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Publication number
US3781972A
US3781972A US00191731A US3781972DA US3781972A US 3781972 A US3781972 A US 3781972A US 00191731 A US00191731 A US 00191731A US 3781972D A US3781972D A US 3781972DA US 3781972 A US3781972 A US 3781972A
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US
United States
Prior art keywords
stud
boss
height
punching
process according
Prior art date
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
Application number
US00191731A
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English (en)
Inventor
E Billy
C Enjolras
P Gautier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JJ Carnaud and Forges de Basse Indre SA
Original Assignee
JJ Carnaud and Forges de Basse Indre SA
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 JJ Carnaud and Forges de Basse Indre SA filed Critical JJ Carnaud and Forges de Basse Indre SA
Application granted granted Critical
Publication of US3781972A publication Critical patent/US3781972A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B65D17/401—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 characterised by having the line of weakness provided in an end wall
    • B65D17/4011—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 characterised by having the line of weakness provided in an end wall for opening completely by means of a tearing tab
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49915—Overedge assembling of seated part

Definitions

  • ABSTRACT This invention relates to the attachment of a pull tab to an easy opening end for cans and like receptacles by means of a novel rivet formation wherein the head of the rivet is of a thickness substantially approaching the original thickness of the material of the end.
  • the rivet is formed in two punching steps each employing a flat headed punch.
  • the present invention relates generally to the securing of a pull ring on a metallic, easy opening end for a food can or other receptacle.
  • so-called easy opening ends comprise one or more weakening lines which define a zone or panel portion that is detachable by a simple pulling operation, and present a pull ring intended to permit the exercising'of such pulling on the panel portion.
  • the present invention m-ore particularly relates to the technique according to which the securing of this pull ring to the end that supports it is effected by means of a rivet formed in the actual body of the end.
  • the punching operations are conducted in two stages in order to make the stress on the metal, which is the top on which the punching operations are effected, more gradual, and thus to avoid elongation ofthe metal which could ultimately cause cracks or ruptures.
  • the first punching operation is effected at present using a punch with a substantially hemispherical head, whereas the head of the final stud which is to be obtained must be substantially flat.
  • the hemispherical form of the boss which is obtained as a result of the first punching operation necessarily requires that the height of this boss is considerably greater than that of the stud which is to be produced ultimately.
  • the size of the boss obtained at the conclusion of the first punching operation can cause a local deformation of the end. More exactly, if one refers to an end which is intended to be seamed onto the cylindrical wall of a can bodyand has a cylindrical wall or chuck wall engageable with the can body, it is not unusual that the boss in question will cause an accidental deformation of the chuck wall. Such a deformation 2 can, on the one hand, ultimately disturb the seaming operation and, on the other hand, it can be the starting point for more serious deformation in the subsequent process of storage of the can.Thus, this deformation of the chuck wall may require discarding of the can which I is so effected.
  • the present invention is intended first in a general way to provide a process which will eliminate these drawbacks.
  • a process of the invention for securing of a pull ring on a metallic, easy opening end of a food can or other receptacle is of the type according to which there are effected, with reference to the said top, punching operations which lead in a first step to the formation ofa boss; next in a second step to the formation ofa stud from the material of the boss, but of generally lesser dimensions, then engagement of the pull ring on the said stud by means of an opening provided for this purpose in the pull ring, and riveting of the stud, characterized in that the first punching operation is effected by means of a punch with a substantially flat head, the boss which is obtained from this first punching operation having preferably a height which is substantially that of the stud which is to be punched.
  • the process of the invention is characterized in that the riveting operation is effected by means of an anvil whose height is at the most 60 percent, preferably less than 50 percent, of the height of the stud.
  • the applicant has found that he can limit the thinning of the metal in the treated zone to the greatest possible extent, and for this purpose of the invention also is characterized in that the punching and riveting operations are conducted in such a way that the difference of thickness of the head of the stud after riveting, as compared to the thickness of the rest of the end is less than 20 percent and preferably at the most equal to 10 percent of the thickness of the end.
  • the process of the invention advantageously allows complete avoidance of any accidental deformation of the end to which it is applied, especially any deformation of its chuck wall.
  • the process of the invention advantageously allows an especially effective fastening of the pull ring on the end that supports it, the pull ring being either fastened directly flat on the end, all around the opening by which it is engaged on the rivet on the end, without the necessity of providing on the end a boss of any kind for angular locking of the pull ring.
  • the process of the invention which requires only two punching steps for production of the riveting stud, is advantageously suited for the treatment of any kind of metallic end, whether it be made of aluminum, with or without coating, of tin, or steel possibly with some protective coating, such as chrome and/or lacquer.
  • the present invention also relates to an easy opening metallic end for a food can or other receptacle furnished with a pull ring riveted according to the process which has been described above, as well as to food cans or other receptacles furnished with such an end.
  • FIG. I is a perspective view of a can with an easy opening metallic end in accordance with the invention.
  • FIG. 2 is an enlarged fragmentary sectional view taken generally along line lllI of FIG. 1;
  • FIGS. 3, 4, 5, 6 are schematic sectional views illustrating the various steps of the process which effect the riveting according to the invention of a pull ring onto a metallic end for a can;
  • FIG. 7 is an enlarged fragmentary sectional view of a pull ring riveted according to the ivnention onto such an end;
  • FIG. 8 is a view similar to FIG. 7 and shown by way of comparison the results of the earlier technique in this art.
  • FIG. 1 there is shown a can 10 equipped with an easy opening end 11 seamed onto the cylindrical wall or body 12 of can 10.
  • the end 11 presents peripherally a score line 13 near the cylindrical chuck wall 14 by which it is secured against the body 12 of the can.
  • the end 11 includes a pull ring I5.
  • the pull ring has an opening I6 by which it is secured on a rivet I7 drawn from the material of the end ll.
  • the invention concerns the process for producing and setting the rivet 17.
  • end 11 is grasped between two dies A, 20B which have hollowed opposite passages 21A, 21B and the end 11 subjected to the action of a punch 23 whose head 24 is substantially flat, the punch 23 being movable in the passages 21B, 21A.
  • Boss 25 with flat head is thereby formed.
  • height H1 of the boss 25, which is considered as being the depth of the punching pass that produced it, is substantially equal to or greater by less than 20 percent of the height H2 of a stud 27 that is to be produced for the rivet, said height being defined in the same conditions.
  • the height H1 of boss 25 as defined above is then for example of the order of about 2.15 mm.
  • End 11 is then subjected to a second punching operation, as shown in FIG. 4, intended to reduce the general dimensions of boss 25 and thus transform it into the stud 27 which can be used as a rivet.
  • This punching operation is conducted between two a manner discussed above by engagement of end 11 two dies 28A, 283 having passages 29A, 29B opposite each other and by the use of a flat head punch 30 which moves in the passages 29A, 29B.
  • the height H2 ofthe stud 27 thus obtained is, for u example, of the order of ab out mm.
  • the active part of punch 30 has a diameter which is substantially less than that of passage 29A with which it cooperates, so that stud 27 has a side wall 32 which is tapered.
  • End 11 is then positioned by its stud 27 on an anvil 33, sitting in the position to which it is guided by the slope of side wall 32 of the stud 27.
  • height H3 of anvil 33 is substantially less than the height H2 of stud 27.
  • This height H3 is no greater than percent and preferably is less than 50 percent of height H2 of the stud.
  • this height H3 is, for example, of the order of 0.8 mm.
  • the anvil 33 is in contact with side wall 32 of stud 27 between the base and the top of the stud 27 along the periphery of the anvil 33. Pull ring 15 is then engaged by its opening 16 on stud 27 and then die 35 is applied all around the opening 16, as shown in FIG. 5.
  • reference numeral 39 designates the rivets thus obtained and reference numeral 40 designates the top part or head of the rivet 39.
  • this riveting is effected almost exclusively by folding of side wall 32 of stud 27 in a circular movement toward the inside of this wall without any great amount of creep in the metal.
  • the advantage that results from it is especially that the thinning of the top part 40 of rivet 39 formed from the stud 27 is very slight.
  • thickness E2 of the top part 40 of rivet 39 is only a little less than thickness E1 of the rest of the end.
  • thickness E1 52 remains less than 20% and is with the end given as an example above, whose initial thickness E1 is 0.22 mm, thickness E2 of the top part 40 of rivet 39 is, for example, about 0.20 mm.
  • FIG. 8 is given as example, showing an end treated according to prior technique with three successive punching operations, the first two being effected by hemispherical punches.
  • a process for the securement of a pull ring having a mounting opening on an easy opening metallic end for can and like receptacle comprising the steps of punching said end and drawing the metal thereof in a single step to form a boss, punching and reshaping the material of said boss to form a stud of a configuration similar to that of the boss but of generally lesser height and diameter dimensions, positioning the ring on the stud, and thereafter deforming the stud in a riveting operation and thereby securing the ring on the stud, said process being characterized in that the punching and drawing of the end to form the boss is effected by means of a punch with a substantially flat head.
  • a process for the securement of a pull ring having a mounting opening on an easy opening metallic end for a can and like receptacle comprising the steps of punching the end and drawing the metal thereof to form a boss, punching and reshaping the material of the boss to form a generally conical stud of the same general outline as the boss but of generally lesser height and diameter dimensions, positioning the ring on the stud, and thereafter deforming the stud in a riveting operation, said process being characterized in that the riveting operation is effected in a single step utilizing an anvil whose height is at the most equal to 60 percent of the height of the stud.
  • anvil has a peripheral surface in contact with the interior of the conical wall of the stud between a base and a top thereof.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Insertion Pins And Rivets (AREA)
  • Containers Opened By Tearing Frangible Portions (AREA)
  • Forging (AREA)
  • Closures For Containers (AREA)
US00191731A 1970-10-30 1971-10-22 Method of securing a pull ring to an easy opening can end Expired - Lifetime US3781972A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7039180A FR2112094B1 (xx) 1970-10-30 1970-10-30

Publications (1)

Publication Number Publication Date
US3781972A true US3781972A (en) 1974-01-01

Family

ID=9063537

Family Applications (1)

Application Number Title Priority Date Filing Date
US00191731A Expired - Lifetime US3781972A (en) 1970-10-30 1971-10-22 Method of securing a pull ring to an easy opening can end

Country Status (7)

Country Link
US (1) US3781972A (xx)
CA (1) CA960161A (xx)
DE (1) DE2141324A1 (xx)
DK (1) DK158252C (xx)
FR (1) FR2112094B1 (xx)
GB (1) GB1325145A (xx)
SE (1) SE391882B (xx)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989002854A1 (en) * 1987-01-23 1989-04-06 Weirton Steel Corporation Abuse resistant, safety-edge, controlled-opening convenience-feature endclosures
US20060213050A1 (en) * 2005-03-22 2006-09-28 Armin Herb Eyelet and method of forming the same
US20110147382A1 (en) * 2009-12-21 2011-06-23 Mark Richard Mitchell Tab with reinforced rivet hole, and tooling and associated method for providing same
CN105903795A (zh) * 2016-06-02 2016-08-31 昆山江鸿精密电子有限公司 一种双模具压铆成型装置
CN113579099A (zh) * 2021-08-04 2021-11-02 揭阳市华龙易拉盖有限公司 一种易拉盖生产系统

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6091806U (ja) * 1983-11-30 1985-06-22 株式会社三協精機製作所 モ−タ−におけるステ−タの結合構造
FR2661659B3 (fr) * 1990-05-02 1992-03-13 Lorraine Laminage Languette de tirage pour un couvercle a ouverture facile, son procede de fixation sur le couvercle, et couvercle muni de cette languette.

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3191564A (en) * 1963-05-15 1965-06-29 Ermal C Fraze Method of fabricating a sheet metal joint
US3346948A (en) * 1964-08-14 1967-10-17 Central States Can Corp Method of fastening a tab to a metallic container wall
US3361102A (en) * 1964-11-06 1968-01-02 American Can Co Method of making an end closure
US3440713A (en) * 1963-06-11 1969-04-29 Continental Can Co Method for forming a rivet and attaching a pull tab therewith
US3479979A (en) * 1967-11-16 1969-11-25 Aluminum Co Of America Metal forming
US3557441A (en) * 1968-01-05 1971-01-26 Continental Can Co Method of forming single operation rivet
US3606076A (en) * 1969-05-07 1971-09-20 American Can Co Container opening means
US3637106A (en) * 1969-12-02 1972-01-25 Dayton Reliable Tool & Mfg Co Pull-tab secured by riveted joint

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3191564A (en) * 1963-05-15 1965-06-29 Ermal C Fraze Method of fabricating a sheet metal joint
US3440713A (en) * 1963-06-11 1969-04-29 Continental Can Co Method for forming a rivet and attaching a pull tab therewith
US3346948A (en) * 1964-08-14 1967-10-17 Central States Can Corp Method of fastening a tab to a metallic container wall
US3361102A (en) * 1964-11-06 1968-01-02 American Can Co Method of making an end closure
US3479979A (en) * 1967-11-16 1969-11-25 Aluminum Co Of America Metal forming
US3557441A (en) * 1968-01-05 1971-01-26 Continental Can Co Method of forming single operation rivet
US3606076A (en) * 1969-05-07 1971-09-20 American Can Co Container opening means
US3637106A (en) * 1969-12-02 1972-01-25 Dayton Reliable Tool & Mfg Co Pull-tab secured by riveted joint

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989002854A1 (en) * 1987-01-23 1989-04-06 Weirton Steel Corporation Abuse resistant, safety-edge, controlled-opening convenience-feature endclosures
US20060213050A1 (en) * 2005-03-22 2006-09-28 Armin Herb Eyelet and method of forming the same
US7996977B2 (en) * 2005-03-22 2011-08-16 Hilti Aktiengesellschaft Eyelet and method of forming the same
US20110147382A1 (en) * 2009-12-21 2011-06-23 Mark Richard Mitchell Tab with reinforced rivet hole, and tooling and associated method for providing same
EP2516284A4 (en) * 2009-12-21 2015-10-07 Stolle Machinery Co Llc PAD HAVING A REINFORCED RIVET HOLE, AND MACHINING AND ASSOCIATED METHOD FOR PROVIDING THE SAME
US9573724B2 (en) * 2009-12-21 2017-02-21 Stolle Machinery Company, Llc Tab with reinforced rivet hole, and tooling and associated method for providing same
US20170113835A1 (en) * 2009-12-21 2017-04-27 Stolle Machinery Company, Llc Tab with reinforced rivet hole, and tooling and associated method for providing same
US10384830B2 (en) * 2009-12-21 2019-08-20 Stolle Machinery Company, Llc Tab with reinforced rivet hole, and tooling and associated method for providing same
CN105903795A (zh) * 2016-06-02 2016-08-31 昆山江鸿精密电子有限公司 一种双模具压铆成型装置
CN113579099A (zh) * 2021-08-04 2021-11-02 揭阳市华龙易拉盖有限公司 一种易拉盖生产系统
CN113579099B (zh) * 2021-08-04 2023-01-06 揭阳市华龙易拉盖有限公司 一种易拉盖生产系统

Also Published As

Publication number Publication date
DK158252B (da) 1990-04-23
FR2112094B1 (xx) 1973-11-23
SE391882B (sv) 1977-03-07
CA960161A (en) 1974-12-31
GB1325145A (en) 1973-08-01
DE2141324A1 (de) 1972-05-04
FR2112094A1 (xx) 1972-06-16
DK158252C (da) 1990-09-24

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