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EP0178264B1 - Device for opening a metallic container - Google Patents

Device for opening a metallic container Download PDF

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Publication number
EP0178264B1
EP0178264B1 EP85810462A EP85810462A EP0178264B1 EP 0178264 B1 EP0178264 B1 EP 0178264B1 EP 85810462 A EP85810462 A EP 85810462A EP 85810462 A EP85810462 A EP 85810462A EP 0178264 B1 EP0178264 B1 EP 0178264B1
Authority
EP
European Patent Office
Prior art keywords
tongue
wall
welding
tab
weld nugget
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
Application number
EP85810462A
Other languages
German (de)
French (fr)
Other versions
EP0178264A1 (en
Inventor
Siegfried Frei
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.)
Elpatronic AG
Original Assignee
Elpatronic AG
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 Elpatronic AG filed Critical Elpatronic AG
Priority to AT85810462T priority Critical patent/ATE35662T1/en
Publication of EP0178264A1 publication Critical patent/EP0178264A1/en
Application granted granted Critical
Publication of EP0178264B1 publication Critical patent/EP0178264B1/en
Expired legal-status Critical Current

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Classifications

    • 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
    • B65D17/42—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions with cutting, punching, or cutter accommodating means
    • B65D17/46—Wires, strings or the like, e.g. rip cords
    • B65D17/462—Tearing-strips or -wires
    • B65D17/464—Tearing-strips or -wires with tongues or tags for engagement by slotted keys
    • 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
    • B65D17/402—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 the side wall

Definitions

  • the invention relates to a device for opening a metal can according to the preamble of claim 1.
  • a tear tab which covers a v-shaped recess between the weakening grooves in the can jacket and hermetically seals it.
  • the tab is connected to the jacket with a spot weld between the legs of the v-shaped recess.
  • the v-shaped recess is sealed by an elastic sealant introduced between the tab and the jacket or by solder.
  • a device of this type has the disadvantage that the can jacket must first be broken through and then sealed again. The manufacture of such a can is complex and its use for canned goods to be sterilized is not suitable.
  • a can with a tear-open tab with a V-shaped hump embossed therein is known.
  • the connection between the tab and the box is made along the v-shaped shoulder, which is formed by the hump.
  • This known tear tab in which to form a v-shaped welding zone or lens by a hump, i. H. an increase in a locally limited support of the flap on the can body places high demands on the positioning on the weakening grooves in order to achieve an optimal tear guarantee.
  • the object of the present invention is to provide an inexpensive, tear-proof device for opening a metal can, which avoids the disadvantages of the known arrangements.
  • this object is achieved in accordance with the characterizing features of patent claim 1.
  • the jacket sheet Due to the poorer conductivity of the material of the tab, the jacket sheet is overheated when the tab is welded on and thus harder. When the tab is lifted, the jacket sheet breaks along the welding lens, the shape of the welding lens is therefore only of secondary importance.
  • the flap By attaching two or three welding points, the flap can be welded on with little energy without the corrosion protection layer on the inside of the can being significantly affected.
  • the seam-like arrangement of the welding lens advantageously enables it to be covered by the seam protection lacquer.
  • a sheet metal blank equipped with such a tab can be processed on conventional welding machines without any adjustments.
  • Two tightly spaced weakening grooves have the advantage that even if the crack unexpectedly breaks through the outer weakening groove, the opening does not fail because the crack can then follow the inner groove.
  • the jacket 1 of a can 2 without bottom and lid and the welded longitudinal seam 3 and two completely circumferential, parallel adjacent weakening grooves 4 are visible.
  • a tab 6 is welded in the area of the weakening grooves 4.
  • the welding lens 5 is essentially V-shaped, the tip 7 of the welding lens 5 pointing in the direction of the loose end of the tab 6.
  • the tab 6 in FIG. 2 In the enlarged illustration of the tab 6 in FIG. 2, four of them are fitted in pairs instead of two weakening grooves 4.
  • the ends 8 of the welding lens 5 overlap the grooves 4 on both sides by a few tenths of a millimeter or somewhat more and are 1 to 10 millimeters away from the welding seam 3.
  • section VII-VII according to FIG. 6 it can be seen that the tab 6 can be embedded in a recess 9 which is stamped against the inside of the can.
  • the surface of the can jacket 1 and the tab 6 are then preferably essentially flush with one another.
  • FIG. 6 also shows that the thickness SL of the tab 6 can be greater than the thickness SM of the jacket 1.
  • the outline of a protective lacquer layer 11 applied to the seam 3 on the inside of the can is indicated in broken line 10.
  • the already applied, approximately 8-12 mm wide protective layer 11 covers the area of the welding lens 5 in the arrangement of the tab 6 according to the invention and also protects it from corrosion without additional effort.
  • a welding lens 5 having a tip 7 toward the loose end of the tab 6 can best be achieved by a projection welding.
  • a V-shaped hump 12 is embossed, for example simultaneously with the punching out of the tab 6, i. H. a V-shaped elevation forming a contact surface to create a locally limited welding zone (Fig. 4/5).
  • a tab 6 designed in this way is carried out in a conventional manner with a projection welding device, specifically on a flat surface Sheet metal cut before it is rolled into a cylindrical hull and welded lengthways.
  • a band-shaped intermediate electrode can be inserted, which is renewed after each weld.
  • the welding lens 5 consists of three welding points arranged in a triangle, one corner of the triangle pointing towards the loose end of the tab 6 and - as in the embodiment according to FIG. 2 - the beginning of the crack when the tab 6 is pulled off forms.
  • FIG. 2 also indicates that if the crack 13 “runs away” inwards due to a discontinuity in the outer weakening groove 4 (top) - the crack 13 continues along the inner groove 4 and the can 2 can be opened properly.
  • the tab 6 is preferably attached to the weld seam 3 on the side of the sheet metal edge 14 lying above.
  • a current intensity I is selected which is adapted for welding two objects of the thickness SL of the flap 6.
  • smaller thickness SD of the can jacket 1 it is slightly overheated during welding and the material hardens along the welding lens 5.
  • the tab 6 is lifted, the sheet metal first breaks along the welding lens 5 of the can jacket 1.
  • a tab 6 which is thicker than the sheet metal of the can jacket 1
  • a tab 6 made of a material of greater strength than that of steel can also be used. Suitable materials have z.
  • the thickness SL of the tab 6 can even be less than the thickness SD of the jacket 1. As a result, the impression in the jacket 1 is also less deep and thus simplifying processing.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
  • Laser Beam Processing (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

1. A device for opening a metal con along two weakening grooves (4) provided on the circumference of the can wall (1), having a tongue (6) welded onto the can wall between the weakening grooves, which tongue is welded onto the can wall in such a manner that the weld nugget (5) resulting from the welding overlaps the weakening grooves at both sides and ends in a point in the central region at the side adjacent to the unwelded end of the tongue, characterised in that the weld nugget (5) comprising a point (7) is composed of a plurality of interlinked welding spots, the welding spots being appropriately placed or being able to be produced by the surface structure of the tongue (6).

Description

Die Erfindung betrifft eine Vorrichtung zum Öffnen einer Metalldose gemäss Oberbegriff des Patentanspruches 1.The invention relates to a device for opening a metal can according to the preamble of claim 1.

Vorrichtungen zum Öffnen einer Dose längs am Umfang des Dosenmantels eingeprägter Schwächungsrillen sind bekannt.Devices for opening a can along the circumference of the can jacket embossing grooves are known.

Aus der US-A-2753075 ist eine Aufreisslasche bekannt, die eine v-förmige Ausnehmung zwischen den Schwächungsrillen im Dosenmantel abdeckt und hermetisch verschliesst. Die Lasche ist mit einer punktförmigen Schweissverbindung zwischen den Schenkeln der v-förmigen Ausnehmung mit dem Mantel verbunden. Die Abdichtung der v-förmigen Ausnehmung erfolgt durch ein zwischen die Lasche und dem Mantel eingebrachtes elastisches Dichtungsmittel oder durch Lötzinn. Eine Vorrichtung dieser Art hat den Nachteil, dass der Dosenmantel erst durchbrochen und anschliessend wieder abgedichtet werden muss. Die Herstellung einer solchen Dose ist aufwendig und eine Verwendung für zu sterilisierende Konserven nicht geeignet.From US-A-2753075 a tear tab is known which covers a v-shaped recess between the weakening grooves in the can jacket and hermetically seals it. The tab is connected to the jacket with a spot weld between the legs of the v-shaped recess. The v-shaped recess is sealed by an elastic sealant introduced between the tab and the jacket or by solder. A device of this type has the disadvantage that the can jacket must first be broken through and then sealed again. The manufacture of such a can is complex and its use for canned goods to be sterilized is not suitable.

Aus der den Oberbegriff des Patentanspruchs 1 bildenden US-A-2806628 ist eine Dose mit einer Aufreisslasche mit einem in diese eingeprägten v-förmigen Buckel bekannt. Die Verbindung zwischen der Lasche und der Dose erfolgt längs des v-förmigen Absatzes, der durch den Buckel gebildet wird. Diese bekannte Aufreisslasche, bei der zur Bildung einer v-förmigen Schweisszone oder -linse durch einen Buckel, d. h. eine Erhöhung eine örtlich begrenzte Auflage der Lasche auf dem Dosenrumpf erzeugt wird, stellt hohe Ansprüche an die Positionierung auf den Schwächungsrillen, um eine optimale Aufreissgarantie zu erreichen.From US-A-2806628 forming the preamble of claim 1, a can with a tear-open tab with a V-shaped hump embossed therein is known. The connection between the tab and the box is made along the v-shaped shoulder, which is formed by the hump. This known tear tab, in which to form a v-shaped welding zone or lens by a hump, i. H. an increase in a locally limited support of the flap on the can body places high demands on the positioning on the weakening grooves in order to achieve an optimal tear guarantee.

Die Aufgabe der vorliegenden Erfindung besteht nun darin, eine preisgünstige, aufreisssichere Vorrichtung zum Öffnen einer Metalldose zu schaffen, welche die Nachteile der bekannten Anordnungen vermeidet.The object of the present invention is to provide an inexpensive, tear-proof device for opening a metal can, which avoids the disadvantages of the known arrangements.

Nach Erfindung wird diese Aufgabe gemäss den gekennzeichnenden Merkmalen des Patentanspruchs 1 gelöst. Durch die Verwendung eines Materials für die Lasche, das eine höhere Festigkeit aufweist als das Material des Dosenmantels, wird sichergestellt, dass beim Anheben der Lasche das Blech des Mantels zuerst reisst und die Risse längs den Schwächungslinien verlaufen.According to the invention, this object is achieved in accordance with the characterizing features of patent claim 1. By using a material for the flap that has a higher strength than the material of the can jacket, it is ensured that when the flap is lifted, the sheet metal of the jacket tears first and the cracks run along the lines of weakness.

Weitere vorteilhafte Ausbildungsformen der Erfindung sind in den abhängigen Ansprüchen beschrieben.Further advantageous embodiments of the invention are described in the dependent claims.

Durch die schlechtere Leitfähigkeit des Materials der Lasche wird das Mantelblech beim Anschweissen der Lasche überhitzt und damit härter. Beim Anheben der Lasche bricht in der Folge zuerst das Mantelblech längs der Schweisslinse, die Gestalt der Schweisslinse ist dadurch nur noch von sekundärer Bedeutung.Due to the poorer conductivity of the material of the tab, the jacket sheet is overheated when the tab is welded on and thus harder. When the tab is lifted, the jacket sheet breaks along the welding lens, the shape of the welding lens is therefore only of secondary importance.

Durch das Anbringen von zwei oder drei Schweisspunkten kann mit wenig Energie die Lasche aufgeschweisst werden, ohne dass auf der Doseninnenseite die Korrosionsschutzschicht wesentlich in Mitleidenschaft gezogen wird.By attaching two or three welding points, the flap can be welded on with little energy without the corrosion protection layer on the inside of the can being significantly affected.

Die nahtname Anordnung der Schweisslinse ermöglicht in vorteilhafter Weise die Abdeckung derselben durch den Nahtschutzlack.The seam-like arrangement of the welding lens advantageously enables it to be covered by the seam protection lacquer.

Ist die Lasche in eine Prägevertiefung eingelegt, so kann ein mit einer solchen Lasche bestückter Blechzuschnitt auf herkömmlichen Schweissautomaten ohne irgendwelche Anpassungen verarbeitet werden. Je zwei dicht beieinanderliegende Schwächungsrillen haben den Vorteil, dass auch dann, wenn der Riss unvorhergesehenerweise die äussere Schwächungsrille nach innen durchbricht, das Öffnen nicht misslingt, weil der Riss dann der inneren Rille folgen kann.If the tab is inserted into an embossing recess, a sheet metal blank equipped with such a tab can be processed on conventional welding machines without any adjustments. Two tightly spaced weakening grooves have the advantage that even if the crack unexpectedly breaks through the outer weakening groove, the opening does not fail because the crack can then follow the inner groove.

Anhand illustrierter Ausführungsbeispiele wird die Erfindung näher beschrieben. Es zeigen:

  • Figur 1 eine perspektivische Darstellung eines Dosenmantels,
  • Figuren 2 und 3 je eine Aufsicht auf eine Lasche und den benachbarten Bereich des Dosenmantels,
  • Figur 4 einen Schnitt längs Linie V-V in Figur 5,
  • Figur 5 eine Aufsicht auf die Lasche,
  • Figur 6 einen Schnitt längs Linie VII-VII in Figur 2.
The invention is described in more detail with reference to illustrated exemplary embodiments. Show it:
  • FIG. 1 shows a perspective illustration of a can jacket,
  • FIGS. 2 and 3 each show a top view of a tab and the adjacent area of the can jacket,
  • FIG. 4 shows a section along line VV in FIG. 5,
  • FIG. 5 is a top view of the tab,
  • FIG. 6 shows a section along line VII-VII in FIG. 2.

In Figur 1 sind der Mantel 1 einer Dose 2 ohne Boden und Deckel und die geschweisste Längsnaht 3 sowie zwei vollständig umlaufende, parallel nebeneinanderliegende Schwächungsrillen 4 sichtbar. Im Bereich der Schwächungsrillen 4 ist eine Lasche 6 aufgeschweisst. Die Schweisslinse 5 ist im wesentlichen v-förmig ausgebildet, wobei die Spitze 7 der Schweisslinse 5 in Richtung auf das lose Ende der Lasche 6 zeigt.In Figure 1, the jacket 1 of a can 2 without bottom and lid and the welded longitudinal seam 3 and two completely circumferential, parallel adjacent weakening grooves 4 are visible. A tab 6 is welded in the area of the weakening grooves 4. The welding lens 5 is essentially V-shaped, the tip 7 of the welding lens 5 pointing in the direction of the loose end of the tab 6.

In der vergrösserten Darstellung der Lasche 6 in Figur 2 sind anstelle von zwei Schwächungsrillen 4 deren vier paarweise angebracht. Die Enden 8 der Schweisslinse 5 überlappen die Rillen 4 beidseitig um einige Zehntelsmillimeter oder etwas mehr und liegen 1 bis 10 Millimeter von der Schweissnaht 3 entfernt. Im Schnitt VII-VII gemäss Figur 6 ist ersichtlich, dass die Lasche 6 in einer gegen das Doseninnere eingeprägten Vertiefung 9 eingebettet liegen kann. Die Oberfläche des Dosenmantels 1 und der Lasche 6 liegen dann vorzugsweise im wesentlichen bündig zueinander.In the enlarged illustration of the tab 6 in FIG. 2, four of them are fitted in pairs instead of two weakening grooves 4. The ends 8 of the welding lens 5 overlap the grooves 4 on both sides by a few tenths of a millimeter or somewhat more and are 1 to 10 millimeters away from the welding seam 3. In section VII-VII according to FIG. 6 it can be seen that the tab 6 can be embedded in a recess 9 which is stamped against the inside of the can. The surface of the can jacket 1 and the tab 6 are then preferably essentially flush with one another.

Aus der Figur 6 ist weiter ersichtlich, dass die Dicke SL der Lasche 6 grösser sein kann als die Dicke SM des Mantels 1.FIG. 6 also shows that the thickness SL of the tab 6 can be greater than the thickness SM of the jacket 1.

In gebrochener Linie 10 ist der Umriss einer auf der Doseninnenseite auf die Naht 3 aufgetragenen Schutzlackschicht 11 angedeutet. Die ohnehin aufgetragene, zirka 8-12 mm breite Schutzschicht 11 überdeckt bei der erfindungsgemässen Anordnung der Lasche 6 den Bereich der Schweisslinse 5 und schützt auch diesen ohne Mehraufwand vor Korrosion.The outline of a protective lacquer layer 11 applied to the seam 3 on the inside of the can is indicated in broken line 10. The already applied, approximately 8-12 mm wide protective layer 11 covers the area of the welding lens 5 in the arrangement of the tab 6 according to the invention and also protects it from corrosion without additional effort.

Eine zum losen Ende der Lasche 6 hin eine Spitze 7 aufweisende Schweisslinse 5 kann am besten durch eine Buckelschweissung erzielt werden. Dazu wird, beispielsweise gleichzeitig mit dem Ausstanzen der Lasche 6, ein v-förmiger Buckel 12 geprägt, d. h. eine v-förmige, eine Kontaktfläche bildende Erhöhung zur Erzeugung einer örtlich begrenzten Schweisszone (Fig. 4/5).A welding lens 5 having a tip 7 toward the loose end of the tab 6 can best be achieved by a projection welding. For this purpose, a V-shaped hump 12 is embossed, for example simultaneously with the punching out of the tab 6, i. H. a V-shaped elevation forming a contact surface to create a locally limited welding zone (Fig. 4/5).

Die Verschweissung einer solcherart gestalteten Lasche 6 erfolgt in herkömmlicher Weise mit einer Buckelschweissvorrichtung, und zwar am flachen Blechzuschnitt, bevor dieser zu einem zylindrischen Rumpf gerollt und längsnahtgeschweisst wird. Zur Vermeidung der Aniegierung von Zinn an den Elektroden kann eine bandförmige Zwischenelektrode eingelegt werden, welche nach jeder Schweissung erneuert wird.The welding of a tab 6 designed in this way is carried out in a conventional manner with a projection welding device, specifically on a flat surface Sheet metal cut before it is rolled into a cylindrical hull and welded lengthways. To prevent tin from being bent onto the electrodes, a band-shaped intermediate electrode can be inserted, which is renewed after each weld.

In der Figur 3 besteht die Schweisslinse 5 aus drei in einem Dreieck angeordneten Schweisspunkten, wobei eine Ecke des Dreieckes in Richtung auf das lose Ende der Lasche 6 zeigt und - wie bei der Ausbildung nach Figur 2 - den Anfang des Risses beim Abziehen der Lasche 6 bildet.In FIG. 3, the welding lens 5 consists of three welding points arranged in a triangle, one corner of the triangle pointing towards the loose end of the tab 6 and - as in the embodiment according to FIG. 2 - the beginning of the crack when the tab 6 is pulled off forms.

Der Verlauf der Risse ist in den Figuren 2 und 3 als gebrochene Linie 13 sichtbar gemacht. In Figur 2 ist zudem angedeutet, dass - wenn wegen einer Unstetigkeit in der äusseren Schwächungsrille 4 (oben) der Riss 13 nach innen «wegläuft» - der Riss 13 längs der inneren Rille 4 fortgeführt und die Dose 2 einwandfrei geöffnet werden kann.The course of the cracks is made visible in FIGS. 2 and 3 as a broken line 13. FIG. 2 also indicates that if the crack 13 “runs away” inwards due to a discontinuity in the outer weakening groove 4 (top) - the crack 13 continues along the inner groove 4 and the can 2 can be opened properly.

Die Lasche 6 ist vorzugsweise auf der Seite der obenliegenden Blechkante 14 an der Schweissnaht 3 angebracht. Beim Schweissen des Lappens 6 auf den Dosenmantel 1 wird eine Stromstärke I gewählt, welche zum Schweissen von zwei Gegenständen von der Dicke SL des Lappens 6 angepasst ist. Infolge der jedoch geringeren Dicke SD des Dosenmantels 1 wird dieser beim Schweissen leicht überhitzt und es findet eine Verhärtung des Materials längs der Schweisslinse 5 statt. Durch diese Versprödung bricht beim Anheben der Lasche 6 zuerst das Blech längs der Schweisslinse 5 des Dosenmantels 1.The tab 6 is preferably attached to the weld seam 3 on the side of the sheet metal edge 14 lying above. When welding the flap 6 onto the can jacket 1, a current intensity I is selected which is adapted for welding two objects of the thickness SL of the flap 6. As a result of the, however, smaller thickness SD of the can jacket 1, it is slightly overheated during welding and the material hardens along the welding lens 5. As a result of this embrittlement, when the tab 6 is lifted, the sheet metal first breaks along the welding lens 5 of the can jacket 1.

Anstelle einer gegenüber dem Blech des Dosenmantels 1 dickeren Lasche 6 kann auch eine Lasche 6 aus einem Material von grösserer Festigkeit als derjenigen von Stahl verwendet werden. Als geeignete Materialien haben sich z. B. Chromnickelstähle und legierte Stähle erwiesen.Instead of a tab 6 which is thicker than the sheet metal of the can jacket 1, a tab 6 made of a material of greater strength than that of steel can also be used. Suitable materials have z. B. Chromium-nickel steels and alloyed steels have been proven.

Durch den Einsatz einer Lasche 6 aus einem Material, das auch zäher ist als das Material des Dosenmantels 1, kann die Dicke SL der Lasche 6 sogar geringer sein als die Dicke SD des Mantels 1. Dadurch wird die Einprägung im Mantel 1 ebenfalls weniger tief und damit die Verarbeitung vereinfacht.By using a tab 6 made of a material that is also tougher than the material of the can jacket 1, the thickness SL of the tab 6 can even be less than the thickness SD of the jacket 1. As a result, the impression in the jacket 1 is also less deep and thus simplifying processing.

Claims (7)

1. A device for opening a metal con along two weakening grooves (4) provided on the circumference of the can wall (1), having a tongue (6) welded onto the can wall between the weakening grooves, which tongue is welded onto the can wall in such a manner that the weld nugget (5) resulting from the welding overlaps the weakening grooves at both sides and ends in a point in the central region at the side adjacent to the unwelded end of the tongue, characterised in that the weld nugget (5) comprising a point (7) is composed of a plurality of interlinked welding spots, the welding spots being appropriately placed or being able to be produced by the surface structure of the tongue (6).
2. A device according to Claim 1, characterised in that the weld nugget (5) consists of three overlapping welding spots forming a triangle.
3. A device according to Claim 1, characterised in that the tongue (6) consists of a material, the strength of which is greater than the strength of the material from which the can wall (1) is produced.
4. A device according to any one of the preceding Claims, characterised in that the weld nugget (5) is provided on the can wall (1) at a distance of 1.0 to 6 mm away from the welding seam (3).
5. A device according to any one of the preceding Claims, characterised in that a depression (9) directed towards the interior of the can (2) and receiving the tongue (6) is impressed on the can wall (1).
6. A device according to any one of the preceding Claims, characterised in that the tongue (6) is produced from an alloyed steel or chrome-nickel steel.
7. A device according to any one or more of the Claims 1 to 6, characterised in that the weld nugget (7) is covered with a coat of protective lacquer (11) in the interior of the can, which coat of protective lacquer (11) has been applied to protect the welding seam (3).
EP85810462A 1984-10-11 1985-10-09 Device for opening a metallic container Expired EP0178264B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85810462T ATE35662T1 (en) 1984-10-11 1985-10-09 DEVICE FOR OPENING A METAL CAN.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4880/84A CH677218A5 (en) 1984-10-11 1984-10-11 Metal can-opening system
CH4880/84 1984-10-11

Publications (2)

Publication Number Publication Date
EP0178264A1 EP0178264A1 (en) 1986-04-16
EP0178264B1 true EP0178264B1 (en) 1988-07-13

Family

ID=4284152

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85810462A Expired EP0178264B1 (en) 1984-10-11 1985-10-09 Device for opening a metallic container

Country Status (4)

Country Link
EP (1) EP0178264B1 (en)
AT (1) ATE35662T1 (en)
CH (1) CH677218A5 (en)
DE (1) DE3563726D1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101767672B (en) * 2009-12-28 2012-01-11 吴江市华源印铁制罐有限责任公司 De-coil type easily opened and closed can and skip welding-soldering combined technique for processing same

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR744304A (en) * 1933-04-14
US2181339A (en) * 1937-08-28 1939-11-28 Continental Can Co Easy opening can
US2753075A (en) * 1951-12-24 1956-07-03 American Can Co Tear open container with separate tongue
US2792145A (en) * 1954-04-19 1957-05-14 Gen Electric Co Ltd Container opening means
US2806628A (en) * 1955-05-27 1957-09-17 Raytheon Mfg Co Tear tabs for tin cans and methods for forming them
US2946478A (en) * 1958-09-22 1960-07-26 Kelsey Hayes Co Opening means for sealed containers

Also Published As

Publication number Publication date
CH677218A5 (en) 1991-04-30
EP0178264A1 (en) 1986-04-16
ATE35662T1 (en) 1988-07-15
DE3563726D1 (en) 1988-08-18

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