EP0768976A1 - Snap fastener on a container - Google Patents

Snap fastener on a container

Info

Publication number
EP0768976A1
EP0768976A1 EP96908986A EP96908986A EP0768976A1 EP 0768976 A1 EP0768976 A1 EP 0768976A1 EP 96908986 A EP96908986 A EP 96908986A EP 96908986 A EP96908986 A EP 96908986A EP 0768976 A1 EP0768976 A1 EP 0768976A1
Authority
EP
European Patent Office
Prior art keywords
container
bead
closure cap
closure
engagement
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.)
Granted
Application number
EP96908986A
Other languages
German (de)
French (fr)
Other versions
EP0768976B1 (en
Inventor
Udo Bösl
Michael Kirchgessner
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.)
Crown Cork AG
Original Assignee
Crown Cork 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 Crown Cork AG filed Critical Crown Cork AG
Publication of EP0768976A1 publication Critical patent/EP0768976A1/en
Application granted granted Critical
Publication of EP0768976B1 publication Critical patent/EP0768976B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
    • B65D41/02—Caps or cap-like covers without lines of weakness, tearing strips, tags, or like opening or removal devices
    • B65D41/16—Snap-on caps or cap-like covers
    • B65D41/18—Snap-on caps or cap-like covers non-metallic, e.g. made of paper or plastics

Definitions

  • the invention relates to a snap closure arrangement on a container, with a closure cap with at least one retaining bead for attachment to a container mouth having an outer bead, which retaining bead is arranged on an elastically expandable cylindrical wall of the closure cap, with an engagement top surface of the retaining bead can be brought into active engagement with an engagement surface of the outer bead.
  • Such snap lock arrangements are known. They are made of elastic plastic material. They are usually made of polyethylene or polypropylene and are made in one piece by injection molding or compression molding. Thanks to the elastic expandability of the cylindrical walls which the retaining bead is arranged, the retaining bead can be pressed upward beyond the outer bead of the container mouth when the closure cap is to be lifted off the container mouth. Likewise, however, it is also possible for the closure cap to be inadvertently lifted off the container mouth by an overpressure prevailing inside the container.
  • the object of the invention is to design the snap closure arrangement specified at the outset in such a way that the security against unintentional lifting of the closure cap by an overpressure prevailing in the container is increased in comparison to the known snap closure arrangements.
  • the object is achieved in the snap closure arrangement according to the invention in that the engagement surface of the retaining bead of the closure cap fastened on the container mouth with the engagement surface of the outer bead the mouth of the container includes an outwardly widening gap.
  • the outwardly widening gap between the two engagement surfaces has the effect that smaller forces which expand the cylindrical wall of the closure cap are generated by a given overpressure in the container than in comparable known snap closure arrangements.
  • FIG. 2 shows a vertical section through a second closure cap, which is designed as a screw snap closure cap
  • FIG. 3 shows, on a larger scale, a section through half of a closure cap and a mouth of a container onto which the closure cap is placed,
  • FIG. 5 in a section similar to FIG. 4, a closure cap not according to the invention.
  • the plastic closure cap shown in FIG. 1 has a circular upper wall 1 and a cylindrical peripheral wall 2.
  • a retaining bead 3 extending in the peripheral direction is formed on the inside of the peripheral wall 2.
  • the peripheral wall 2 is elastically expandable in such a way that when the closure cap is placed on a mouth of a container, the retaining bead 3 can slide over an outer bead at the container mouth and can then snap in behind this outer bead. In the same way, the retaining bead 3 can slide back over the outer bead of the container mouth when the closure cap is removed from the container again.
  • the peripheral wall 2 has, in the same way as that shown in FIG. 1, the upper wall 1 and the cylindrical peripheral wall 2.
  • a plurality of retaining beads 3 are formed on the inside of the peripheral wall 2, which extend depending on a section of a helical line, such that the closure cap can be screwed onto a container mouth, which carries a multiple external thread.
  • the peripheral wall 2 can be elastically widened, so that the retaining beads 3 can slide over the corresponding external beads forming the external thread at the container mouth when the closure cap is pulled off or tipped approximately axially from the container mouth.
  • the closure cap again has the upper wall 1 and the peripheral wall 2 with the retaining bead 3 formed on the inside.
  • a cylindrical wall section 4 is shown from the mouth of the container, on which the closure cap is placed, on which an outer bead 5 is formed .
  • the closure cap is fastened on the container mouth in such a way that the top surface or engaging surface of the retaining bead 3 is in active engagement with the bottom surface or engaging surface of the outer bead 5.
  • the two engagement surfaces enclose an outwardly widening gap, at least as long as there is no greater overpressure in the container.
  • the two surfaces (more precisely: tangents to the turning points) the cutting lines) approximately an angle ⁇ of 5 to 15, preferably an angle of 7 to 10 °.
  • FIGS. 4a and 4b show the effect of an overpressure prevailing in the container, which loads the upper wall 1 with the pressure P and presses it upwards.
  • the wall 1 then pulls the peripheral wall 2 upwards, the gap ⁇ initially closing according to FIG. 4a because the retaining bead 2 is elastically deformed and bent downward.
  • Outer bead 5 and retaining bead 3 therefore lie flat against one another over a wide range of the intended internal pressure.
  • the holding force F is accordingly also transmitted across the entire length of the retaining bead 3 to the outer bead 5 of the container.
  • the holding force F between the retaining bead 3 and the outer bead 5 is broken down into a relatively large vertically directed component A and a substantially smaller radially outwardly directed component R.
  • the outward component R is undesirable because it acts to widen the peripheral wall 2 of the closure cap. Since elastic deformation of the retaining bead 3 cannot be avoided, because otherwise the closure cap could not be snapped onto the container mouth, the gap with the angle ⁇ (FIG. 3) ensures that the retaining bead 3 after it has been put on and after Build-up of the overpressure to be expected (eg in the case of carbonated beverages), the retaining bead 3 is deformed downward, the gap closing and the retaining bead 3 reaching its desired position.
  • FIG. 4b shows how the holding force F is increased in the case of a further increase in the internal pressure in such a way that the radially outwardly directed component R also rises, as a result of which the peripheral wall of the closure cap 2 is widened. But even with such an overpressure, as is shown schematically in FIG. 4b, the closure is not yet blasted off from the wall section 4 of the container.
  • FIG. 5 shows the effect of the excess pressure prevailing in the container on a closure cap not according to the invention, in which, in the unloaded state (drawn in with broken lines), between the top surface of the retaining bead W and the underside surface of the outside bead 5 there is no gap widening outwards.
  • the upper wall 1 pulls the peripheral wall 2 slightly upwards and slides the upper side surface of the retaining bead W on the lower side surface of the outer bead 5 obliquely upwards and outwards. Because of the lack of an outwardly widening gap, the point of contact between the two beads is further out than in the case of the closure arrangement according to the invention from FIG.

Abstract

The snap fastener has a closure (1, 2) with a retaining bead (2) to secure it to the container aperture which has an outer bead (5). The retaining bead (3) is arranged on an elastically expandable cylindrical wall (2) of the closure (1, 2). For the purposes of fastening on the container aperture, an engagement surface of the retaining bead (3) can be positively engaged with an engagement surface of the outer bead (5). The two engagement surfaces enclose a gap widening towards the outside. Owing to this gap, a higher overpressure can prevail inside the container without its lifting the closure (1, 2) off the container aperture.

Description

Schnappyerschlussanordnung an einem BehälterSnap lock arrangement on a container
Die Erfindung bezieht sich auf eine Schnappverschlussanord¬ nung an einem Behälter, mit einer Verschlusskappe mit wenig¬ stens einem Rückhaltewulst zum Befestigen auf einer einen Aussenwulst aufweisenden Behältermündung- welcher Rückhalte¬ wulst an einer elastisch aufweitbaren zylindrischen Wand der Verschlusskappe angeordnet ist, wobei eine Eingriffsober¬ fläche des Rückhaltewulstes mit einer Eingriffsoberfläche des Aussenwulstes in Wirkeingriff bringbar ist.The invention relates to a snap closure arrangement on a container, with a closure cap with at least one retaining bead for attachment to a container mouth having an outer bead, which retaining bead is arranged on an elastically expandable cylindrical wall of the closure cap, with an engagement top surface of the retaining bead can be brought into active engagement with an engagement surface of the outer bead.
Solche Schnappverschlussanordnungen sind bekannt. Sie werden aus elastischem Kunststoffmaterial gefertigt. Meist bestehen sie aus Polyäthylen oder Polypropylen und sind einstückig im Spritzgussverfahren oder Compression Molding hergestellt. Dank der elastischen Aufweitbarkeit der zylindrischen Wand¬ en welcher der Rückhaltewulst angeordnet ist, kann der Rück¬ haltewulst über den Aussenwulst der Behältermündung hinaus nach oben gedrückt werden, wenn die Verschlusskappe von der Behältermündung abgehoben werden soll. Ebenso ist aber auch ein unbeabsichtigtes Abheben der Verschlusskappe von der Behältermündung durch einen im Inneren des Behälters herr¬ schenden Ueberdruck möglich.Such snap lock arrangements are known. They are made of elastic plastic material. They are usually made of polyethylene or polypropylene and are made in one piece by injection molding or compression molding. Thanks to the elastic expandability of the cylindrical walls which the retaining bead is arranged, the retaining bead can be pressed upward beyond the outer bead of the container mouth when the closure cap is to be lifted off the container mouth. Likewise, however, it is also possible for the closure cap to be inadvertently lifted off the container mouth by an overpressure prevailing inside the container.
Die Aufgabe der Erfindung besteht darin, die eingangs angege¬ bene Schnappverschlussanordnung so auszubilden, dass die Sicherheit gegen unbeabsichtigtes Abheben der Verschlusskappe durch einen im Behälter herrschenden Ueberdruck im Vergleich zu den bekannten Schnappverschlussanordnungen erhöht ist.The object of the invention is to design the snap closure arrangement specified at the outset in such a way that the security against unintentional lifting of the closure cap by an overpressure prevailing in the container is increased in comparison to the known snap closure arrangements.
Die Aufgabe ist in der erfindungsgemässen Schnappverschluss¬ anordnung dadurch gelöst, dass die Eingriffsoberfläche des Rückhaltewulstes der auf der Behältermündung befestigten Verschlusskappe mit der Eingriffsoberfläche des Aussenwulstes der Behältermündung einen sich nach aussen erweiternden Spalt einschliesst.The object is achieved in the snap closure arrangement according to the invention in that the engagement surface of the retaining bead of the closure cap fastened on the container mouth with the engagement surface of the outer bead the mouth of the container includes an outwardly widening gap.
Der sich nach aussen erweiternde Spalt zwischen den beiden Eingriffsoberflächen hat die Wirkung, dass durch einen gege¬ benen Ueberdruck im Behälter kleinere die zylindrische Wand der Verschlusskappe aufweitende Kräfte erzeugt werden als in vergleichbaren bekannten Schnappverschlussanordnungen.The outwardly widening gap between the two engagement surfaces has the effect that smaller forces which expand the cylindrical wall of the closure cap are generated by a given overpressure in the container than in comparable known snap closure arrangements.
Ausführungsbeispiele der Erfindung werden nachstehend anhand der Zeichnungen näher erläutert. In diesen zeigen:Embodiments of the invention are explained below with reference to the drawings. In these show:
Fig. 1 einen Vertikalschnitt durch eine erste Ver¬ schlusskappe,1 shows a vertical section through a first closure cap,
Fig. 2 einen Vertikalschnitt durch eine zweite Ver¬ schlusskappe, die als Schraub-Schnappverschlusskappe ausge¬ bildet ist,2 shows a vertical section through a second closure cap, which is designed as a screw snap closure cap,
Fig. 3 in grösserem Massstab einen Schnitt durch eine Hälfte einer Verschlusskappe und einer Mündung eines Behälters, auf welche die Verschlusskappe aufgesetzt ist,3 shows, on a larger scale, a section through half of a closure cap and a mouth of a container onto which the closure cap is placed,
Fig. 4a und Fig. 4b in einem gleichen Schnitt wie Fig. 3 einen Zustand, in welchem die Verschlusskappe durch einen im Behälter herrschenden Ueberdruck verformt ist, und4a and 4b in a section similar to FIG. 3, a state in which the closure cap is deformed by an overpressure prevailing in the container, and
Fig. 5 in einem gleichen Schnitt wie Fig. 4 eine nicht erfin- dungsgemässe Verschlusskappe.5 in a section similar to FIG. 4, a closure cap not according to the invention.
Die in Fig. 1 gezeigte, aus Kunststoff bestehende Verschluss¬ kappe besitzt eine kreisrunde obere Wand 1 und eine zylin¬ drische Umfangswand 2. An der Umfangswand 2 ist innenseitig ein sich in Umfangsrichtung erstreckender Rückhaltewulst 3 angeformt. Die Um+fangswand 2 ist derart elastisch aufweit¬ bar, dass beim Aufsetzen der Verschlusskappe auf eine Mündung eines Behälters der Rückhaltewulst 3 über einen Aussenwulst an der Behältermündung gleiten und dann hinter diesem Aus¬ senwulst einrasten kann. In gleicher Weise kann der Rückhal¬ tewulst 3 über den Aussenwulst der Behältermündung zurück¬ gleiten, wenn die Verschlusskappe wieder vom Behälter abge¬ nommen wird.The plastic closure cap shown in FIG. 1 has a circular upper wall 1 and a cylindrical peripheral wall 2. A retaining bead 3 extending in the peripheral direction is formed on the inside of the peripheral wall 2. The peripheral wall 2 is elastically expandable in such a way that when the closure cap is placed on a mouth of a container, the retaining bead 3 can slide over an outer bead at the container mouth and can then snap in behind this outer bead. In the same way, the retaining bead 3 can slide back over the outer bead of the container mouth when the closure cap is removed from the container again.
Die Verschlusskappe gemäss Fig. 2 besitzt in gleicher Weise wie die in Fig. 1 gezeigte die obere Wand 1 und die zylin¬ drische Umfangswand 2. An der Umfangswand 2 sind innenseitig mehrere Rückhaltewulste 3 angeformt, die sich je nach einem Abschnitt einer Schraubenlinie erstrecken, derart, dass die Verschlusskappe auf eine Behältermündung aufgeschraubt werden kann, die ein Mehrfach-Aussengewinde trägt. Auch hier ist jedoch die Umfangswand 2 elastisch aufweitbar, so dass die Rückhaltewulste 3 über die entsprechenden, das Aussengewinde bildenden Aussenwulste an der Behältermündung gleiten können, wenn die Verschlusskappe etwa axial von der Behältermündung abgezogen oder abgekippt wird.2 has, in the same way as that shown in FIG. 1, the upper wall 1 and the cylindrical peripheral wall 2. A plurality of retaining beads 3 are formed on the inside of the peripheral wall 2, which extend depending on a section of a helical line, such that the closure cap can be screwed onto a container mouth, which carries a multiple external thread. Here, too, however, the peripheral wall 2 can be elastically widened, so that the retaining beads 3 can slide over the corresponding external beads forming the external thread at the container mouth when the closure cap is pulled off or tipped approximately axially from the container mouth.
In Fig. 3 sind die Hälften einer Verεchlusskappe und einer Behältermündung in grösserem Massstab dargestellt. Die Ver¬ schlusskappe besitzt wieder die obere Wand 1 und die Umfangs¬ wand 2 mit dem innenseitig angeformten Rückhaltewulst 3. Von der Behältermündung, auf welche die Verschlusskappe aufge¬ setzt ist, ist ein zylindrischer Wandabschnitt 4 dargestellt, an welchen ein Aussenwulst 5 angeformt ist. Die Verschluss¬ kappe ist auf der Behältermündung dadurch befestigt, dass die Oberseitenfläche oder Eingriffsoberfläche des Rückhaltewul¬ stes 3 mit der Unterseitenfläche oder Eingriffsoberfläche des Aussenwulstes 5 in Wirkeingriff steht. Die beiden Eingriffs¬ oberflächen schliessen erfindungsgemäss, mindestens solange im Behälter kein grösserer Ueberdruck herrscht, einen sich nach aussen erweiternden Spalt ein. Im Axialschnitt schlies¬ sen die beiden Flächen (genauer: Tangenten an die Wendepunkte der Schnittlinien) etwa einen Winkel α von 5 bis 15 ein, vorzugsweise einen Winkel von 7 bis 10°.3 shows the halves of a closure cap and a container mouth on a larger scale. The closure cap again has the upper wall 1 and the peripheral wall 2 with the retaining bead 3 formed on the inside. A cylindrical wall section 4 is shown from the mouth of the container, on which the closure cap is placed, on which an outer bead 5 is formed . The closure cap is fastened on the container mouth in such a way that the top surface or engaging surface of the retaining bead 3 is in active engagement with the bottom surface or engaging surface of the outer bead 5. According to the invention, the two engagement surfaces enclose an outwardly widening gap, at least as long as there is no greater overpressure in the container. In axial section, the two surfaces (more precisely: tangents to the turning points) the cutting lines) approximately an angle α of 5 to 15, preferably an angle of 7 to 10 °.
Mit dem sich nach aussen erweiternden Spalt wird die Gefahr verringert, dass die Verschlusskappe durch einen im Behälter herrschenden Ueberdruck unbeabsichtigt von der Behältermün¬ dung abgehoben werden könnte. Es können mit anderen Worten höhere Ueberdrücke im Behälter zugelassen werden.With the gap widening outwards, the risk is reduced that the closure cap could be inadvertently lifted off the mouth of the container by an overpressure in the container. In other words, higher pressures in the container can be permitted.
Die Figuren 4a und 4b zeigen die Wirkung eines im Behälter herrschenden Ueberdrucks, der die obere Wand 1 mit dem Druck P belastet und nach oben drückt. Die Wand 1 zieht dann die Umfangswand 2 nach oben, wobei sich gemäss Fig. 4a zunächst der Spalt mit dem Winkel α schliesst, weil der Rückhaltewulst 2 elastisch deformiert und nach unten gebogen wird. Aussen¬ wulst 5 und Rückhaltewulst 3 liegen deshalb in einem weiten Bereich des vorgesehenen Innendrucks flächig aneinander an. Die Haltekraft F wird dementsprechend ebenfalls flächig über die gesamte Länge des Rückhaltewulstes 3 auf den Aussenwulst 5 des Behälters übertragen. Dadurch wird die Haltekraft F zwischen Rückhaltewulst 3 und Aussenwulst 5 in eine relativ grosse vertikal gerichtete Komponente A und eine wesentlich kleinere radial nach aussen gerichtete Komponente R zerlegt. Die nach aussen gerichtete Komponente R ist deshalb uner¬ wünscht, weil sie auf eine Aufweitung der Umfangswand 2 der Verschlusskappe hinwirkt. Da elastische Verformung des Rück¬ haltewulstes 3 nicht vermieden werden kann, weil sonst die Verschlusskappe nicht auf die Behältermündung geschnappt werden könnte, wird durch den Spalt mit dem Winkel α (Fig. 3) erreicht, dass der Rückhaltewulst 3 nach dem Aufsetzen und nach dem Aufbau des zu erwartenden Ueberdrucks (z.B. bei kohlensäurehaltigen Getränken), der Rückhaltewulst 3 nach unten deformiert wird, wobei sich der Spalt schliesst und der Rückhaltewulst 3 seine Sollposition erreicht. Fig. 4b zeigt, wie bei weiter ansteigendem Innendruck die Haltekraft F derart vergrössert wird, dass auch die radial nach aussen gerichtete Komponente R steigt, wodurch die Umfangswand der Verschlusskappe 2 aufgeweitet wird. Aber auch bei einem derartigen Ueberdruck, wie er in Fig. 4b schema¬ tisch dargestellt ist, wird der Verschluss noch nicht vom Wandabschnitt 4 des Behälters abgesprengt.FIGS. 4a and 4b show the effect of an overpressure prevailing in the container, which loads the upper wall 1 with the pressure P and presses it upwards. The wall 1 then pulls the peripheral wall 2 upwards, the gap α initially closing according to FIG. 4a because the retaining bead 2 is elastically deformed and bent downward. Outer bead 5 and retaining bead 3 therefore lie flat against one another over a wide range of the intended internal pressure. The holding force F is accordingly also transmitted across the entire length of the retaining bead 3 to the outer bead 5 of the container. As a result, the holding force F between the retaining bead 3 and the outer bead 5 is broken down into a relatively large vertically directed component A and a substantially smaller radially outwardly directed component R. The outward component R is undesirable because it acts to widen the peripheral wall 2 of the closure cap. Since elastic deformation of the retaining bead 3 cannot be avoided, because otherwise the closure cap could not be snapped onto the container mouth, the gap with the angle α (FIG. 3) ensures that the retaining bead 3 after it has been put on and after Build-up of the overpressure to be expected (eg in the case of carbonated beverages), the retaining bead 3 is deformed downward, the gap closing and the retaining bead 3 reaching its desired position. 4b shows how the holding force F is increased in the case of a further increase in the internal pressure in such a way that the radially outwardly directed component R also rises, as a result of which the peripheral wall of the closure cap 2 is widened. But even with such an overpressure, as is shown schematically in FIG. 4b, the closure is not yet blasted off from the wall section 4 of the container.
Im Vergleich dazu zeigt die Fig. 5 die Wirkung des im Behäl¬ ter herrschenden Ueberdrucks auf eine nicht erfindungsgemässe Verschlusskappe, bei der im unbelasteten Zustand (mit unter¬ brochenen Linien eingezeichnet) zwischen der Oberseitenfläche des Rückhaltewulstes W und der Unterseitenfläche des Aus¬ senwulstes 5 kein sich nach aussen erweiternder Spalt vorhan¬ den ist. Auch hier zieht die obere Wand 1 die Umfangswand 2 etwas nach oben und gleitet dabei die OberSeitenfläche des Rückhaltewulstes W an der Unterseitenfläche des Aussenwulstes 5 schräg nach oben und aussen. Wegen des fehlenden sich nach aussen erweiternden Spaltes liegt die Berührungsstelle zwi¬ schen den beiden Wülsten weiter aussen als bei der erfin- dungsgemässen Verschlussanordnung von Fig. 4, und die vom Aussenwulst 5 auf den Rückhaltewulst W ausgeübte Haltekraft F' hat, bei gleicher parallel zur Behälterachse gerichteter Komponente A, eine radial nach aussen gerichtete, die Um¬ fangswand 2 aufweitende Komponente R', die einiges grösser ist als die radiale Komponente R bei der Verschlusskappe gemäss den Fig. 3 und 4.In comparison, FIG. 5 shows the effect of the excess pressure prevailing in the container on a closure cap not according to the invention, in which, in the unloaded state (drawn in with broken lines), between the top surface of the retaining bead W and the underside surface of the outside bead 5 there is no gap widening outwards. Here, too, the upper wall 1 pulls the peripheral wall 2 slightly upwards and slides the upper side surface of the retaining bead W on the lower side surface of the outer bead 5 obliquely upwards and outwards. Because of the lack of an outwardly widening gap, the point of contact between the two beads is further out than in the case of the closure arrangement according to the invention from FIG. 4, and the holding force F 'exerted by the outer bead 5 on the retaining bead W is parallel to it Component A directed towards the container, a component R 'directed radially outward and widening the peripheral wall 2, which is somewhat larger than the radial component R in the closure cap according to FIGS. 3 and 4.
Durch den sich nach aussen erweiternden Spalt, der in der erfindungsgemässen Verschlussanordnung vorhanden ist, wird also die Zunahme der im Sinne eines Aufweitens auf die Um¬ fangswand 2 wirkenden Kraft bei im Behälter herrschendem Ueberdruck verringert. As a result of the outwardly widening gap which is present in the closure arrangement according to the invention, the increase in the force acting on the circumferential wall 2 in the sense of widening is reduced when the overpressure prevailing in the container.

Claims

Patentansprüche Claims
1. Schnappverschlussanordnung an einem Behälter, mit einer Verschlusskappe mit wenigstens einem Rückhaltewulst (3) zum Befestigen auf einer einen Aussenwulst aufweisenden Behältermündung, welcher Rückhaltewulst (3) an einer elastisch aufweitbaren zylindrischen Wand (2) der Ver¬ schlusskappe angeordnet ist, wobei eine Eingriffsober¬ fläche des Rückhaltewulstes (3) mit einer Eingriffsober¬ fläche des Aussenwulstes (5) in Wirkeingriff bringbar ist, dadurch gekennzeichnet, dass die Eingriffsoberfläche des Rückhaltewulstes (3) der auf der Behältermündung befestig¬ ten Verschlusskappe mit der Eingriffsoberfläche des Aus¬ senwulstes (5) der Behältermündung einen sich nach aussen erweiternden Spalt einschliesst.1. Snap closure arrangement on a container, with a closure cap with at least one retaining bead (3) for attachment to a container mouth having an outer bead, the retaining bead (3) being arranged on an elastically expandable cylindrical wall (2) of the closure cap, an upper engagement ¬ surface of the retaining bead (3) can be brought into active engagement with an engagement surface of the outer bead (5), characterized in that the engagement surface of the retaining bead (3) of the closure cap fastened on the container mouth with the engagement surface of the outer bead (5 ) the container mouth includes an outwardly widening gap.
2. Schnappverschlussanordnung nach Anspruch 1, dadurch ge¬ kennzeichnet, dass die beiden Eingriffsoberflächen im Axialschnitt einen Winkel (a ) von 5 bs 15° einschliessen.2. Snap lock arrangement according to claim 1, characterized ge indicates that the two engagement surfaces in the axial section enclose an angle (a) of 5 to 15 °.
3. Schnappverschlussanordnung nach Anspruch 2, dadurch ge¬ kennzeichnet, dass die beiden Eingriffsoberflächen im Axialschnitt einen Winkel (α) von 7 bs 10° einschliessen.3. snap lock arrangement according to claim 2, characterized ge indicates that the two engagement surfaces in the axial section enclose an angle (α) of 7 to 10 °.
4. Schnappverschlussanordnung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Verschlusskappe eine auf die Behältermündung aufschnappbare Mehrfachgewindekap¬ pe ist. 4. Snap closure arrangement according to one of claims 1 to 3, characterized in that the closure cap is a multiple thread cap which can be snapped onto the container mouth.
EP96908986A 1995-05-01 1996-04-17 Snap fastener on a container Expired - Lifetime EP0768976B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CH1236/95 1995-05-01
CH123695 1995-05-01
CH123695 1995-05-01
PCT/CH1996/000140 WO1996034807A1 (en) 1995-05-01 1996-04-17 Snap fastener on a container

Publications (2)

Publication Number Publication Date
EP0768976A1 true EP0768976A1 (en) 1997-04-23
EP0768976B1 EP0768976B1 (en) 2000-01-19

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP96908986A Expired - Lifetime EP0768976B1 (en) 1995-05-01 1996-04-17 Snap fastener on a container

Country Status (4)

Country Link
US (1) US5848717A (en)
EP (1) EP0768976B1 (en)
DE (1) DE59604219D1 (en)
WO (1) WO1996034807A1 (en)

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Also Published As

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WO1996034807A1 (en) 1996-11-07
US5848717A (en) 1998-12-15
EP0768976B1 (en) 2000-01-19
DE59604219D1 (en) 2000-02-24

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