EP0414860B1 - Plastic screw cap - Google Patents

Plastic screw cap Download PDF

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Publication number
EP0414860B1
EP0414860B1 EP90903756A EP90903756A EP0414860B1 EP 0414860 B1 EP0414860 B1 EP 0414860B1 EP 90903756 A EP90903756 A EP 90903756A EP 90903756 A EP90903756 A EP 90903756A EP 0414860 B1 EP0414860 B1 EP 0414860B1
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EP
European Patent Office
Prior art keywords
cap
braking element
screw cap
cap according
screw
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
EP90903756A
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German (de)
French (fr)
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EP0414860A1 (en
Inventor
Franz Thomas Bartl
Hans-Werner Breuer
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.)
obrist Closures Switzerland
obrist Closures Switzerlandroemerstrasse 83 Ch 41
Original Assignee
Crown Cork AG
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Publication date
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Priority claimed from ES19898900826U external-priority patent/ES1009616Y/en
Application filed by Crown Cork AG filed Critical Crown Cork AG
Publication of EP0414860A1 publication Critical patent/EP0414860A1/en
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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
    • 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
    • B65D41/04—Threaded or like caps or cap-like covers secured by rotation
    • 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
    • B65D41/04—Threaded or like caps or cap-like covers secured by rotation
    • B65D41/0471—Threaded or like caps or cap-like covers secured by rotation with means for positioning the cap on the container, or for limiting the movement of the cap, or for preventing accidental loosening of the cap

Definitions

  • the invention relates to a screw cap made of plastic material according to the preamble of claim 1.
  • a screw cap is previously known from FR-A-2 569 661.
  • Screw caps of this type are produced in very large quantities by injection molding and are used to close containers of the most varied types. Screw caps made of plastic material have become established, particularly in the area of soft drinks. The screw caps are automatically screwed onto the filled bottles in a fast-running filling line.
  • a problem with known screw caps is that they have to be screwed on with a certain torque in order to ensure a tight seal.
  • the screwing motion is usually limited by the fact that the bottle mouth is on the bottom of the cap.
  • the cap will be unscrewed with too much torque, so that it can then hardly be unscrewed by hand.
  • the threads can also be overtightened, since the bottle mouths have large tolerance fluctuations, particularly in the case of glass bottles.
  • the braking element arranged in the area of the screw line of the external container thread causes the screwing-on process to be blocked without the container opening running onto the cap base with the full torque.
  • the screwing forces are converted into a radial force component, since the external thread tries to overcome the braking element and thus to displace it radially outwards.
  • the stoppage of the screw cap can be brought about with a delay. It is particularly advantageous if the braking element has a run-up flank that runs approximately parallel to the central axis of the cap. In addition, the run-up flank can be inclined to a plane running through the central axis of the cap. The run-up flank is then designed like a ramp on which the external thread runs with increasing radial tension.
  • the braking element can be integrated in the thread of the internal thread, or it can be formed separately from the thread of the internal thread.
  • the braking element can also have a wall section designed as a thread flank for the internal thread. In this way, the braking element is given an additional function. This function can be expanded if the screw cap has one or more support ribs close to the cap base for holding an inserted sealing washer, and if the braking element has a wall section which runs in the plane of the support ribs. As a result, part of the sealing washer rests on the brake element.
  • the multiple functions of the braking element mentioned can be achieved in a particularly simple manner in that it has the shape of a wedge in plan view that extends over one Sector extends from at least 90 °.
  • the run-up flank is arranged on the narrow side of the wedge, which must have a certain minimum width so that the thread start of the external thread always runs onto the braking element even in the event of tolerance fluctuations.
  • a screw cap 1 is shown in FIG. 1, which essentially consists of a cap base 2 and an adjoining, approximately cylindrical cap wall 3. in the Transition area 5 between cap base 2 and cap wall 3, the screw cap is rounded. On the inside of the cap wall 3, the internal thread 4 is arranged, which has approximately 11 ⁇ 2 threads. These are interrupted by ventilation slots 11, which bring about a rapid reduction in pressure when the cap is unscrewed if there is excess pressure in the container.
  • Support ribs 13 are arranged on the cap wall 3 close to the cap base 2 or at the transition region 5. These support ribs serve to hold a sealing washer 12 made of elastic material. As can be seen from FIG. 2, this sealing washer is pushed upwards when the cap is screwed on, whereby it lies sealingly around the mouth region.
  • the braking element 15 At the threaded end 7 of the internal thread 4 there is a braking element 15 which is somewhat less deep than the flanks of the internal thread 4. As FIG. 4 shows, the braking element is designed as an elongated wedge in plan view. it is not connected to the threaded end 7, but begins immediately after a vent slot 11. The braking element extends over the sector from A to B over a little more than 180 °.
  • the braking element has a run-up flank 16 which is inclined at an angle alpha to a plane running through the central axis of the cap, as can be seen from FIG. 3.
  • the run-up flank runs parallel to the central axis, so that a radial force component in the direction of the arrow X is formed when the thread start 10 runs up.
  • the braking element has a wall section 14 which is inclined at the pitch angle of the internal thread 4 and which practically fulfills the function of a thread flank.
  • the braking element also has a wall section 15, which in the level of the support ribs 13 lies.
  • the wall section 15 forms a continuation of the support ribs 13 on which the sealing washer 12 rests.
  • the support ribs 13 are interrupted at the ventilation slots 11 in order to ensure optimum pressure reduction. but it would also be conceivable to arrange a single, contiguous support rib.
  • the wedge-shaped brake element 6 shown in FIG. 4 obviously has a multiple function in that it serves as a stop for the external thread, as a thread flank and as a support shoulder for the sealing disk. This configuration is also particularly advantageous in terms of injection molding and tooling and can be easily removed from the mold.
  • the braking element 6 does not necessarily have to have the wedge shape shown in the exemplary embodiment.
  • the wall section 15 can easily be omitted or take a different relative position.
  • the configuration of the braking element must always be such that it is always in the area of the screw line for the external thread.
  • Figures 5 and 6 show alternative configurations of brake elements.
  • the radial depth can be approximately the same as in the exemplary embodiment according to FIGS. 1 to 4.
  • the braking element 6 is integrally connected to the threaded end 7 of the internal thread and extends like a flag in the helix of the external thread.
  • the thread start 10 of the external thread also runs frontally on the braking element 6.
  • the braking element 6 is U-shaped and is arranged completely separately. The lower leg could theoretically also form the continuation of the internal thread.
  • the thread start 10 of the external thread does not run frontally here, but on the two flanks on the braking element.
  • the braking element 6 is designed as a rib, which can extend over the entire circumference of the cap wall 3 or only over a specific sector.
  • the underside 17 of the rib runs onto the beginning of the external thread 9.
  • the underside 17 exerts an axial braking force.
  • the rib could e.g. also serve as reinforcement of the transition area from the cap base 2 to the cap wall 3.
  • FIGS. 8 and 9 An alternative embodiment of a screw cap according to the invention is shown in FIGS. 8 and 9.
  • the screw cap 1 has an olive-shaped inner seal 21 on the cap base 2, which is pressed into the bottle mouth when screwed on.
  • a guarantee tape 18 is arranged over tear-off webs, which is provided on the inside with at least one retaining element.
  • a circumferential bead 19 is provided, under which the retaining element 20 engages when the cap is screwed on for the first time.
  • the guarantee band is completely or partially separated from the lower edge of the cap, so that a first opening is indicated.
  • the retaining elements having different shapes, e.g. Squats, tongues, beads, etc. may have.
  • the braking element 6 is now particularly advantageously arranged in such a way that its braking action begins when the cap is screwed on for the first time immediately after the retaining element 20 engages under the bead 19.
  • the braking element 6 could also be arranged in such a way that the braking effect starts before the retaining element engages and that when the braking process is ended, ie when the screw cap is at a standstill, the engaging position is just reached.
  • the braking element consists of a rib or a thickening in the transition region 5 of the cap.
  • the rib extends over an angle beta of approximately 75 °.
  • the inner radius r of the rib is less than half the diameter d of the external thread 9.
  • the thread start 10 of the external thread thus runs on the run-up flank 16, presses the rib 6 radially outward and brings about standstill due to the increased friction after a certain arc length the screw cap.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)

Abstract

A screw cap (1) comprises an internal screw thread (4). A braking element (6) located at the level of the spiral of the external screw thread (9) is arranged at the end (7) of the internal screw thread (4) opposite the base of the cap (2). When the cap is screwed on, the beginning (10) of the external screw thread strikes against this braking element wich exerts a braking action and limits the screwing movement.

Description

Die Erfindung betrifft eine Schraubkappe aus Kunststoffmaterial gemäss dem Oberbegriff von Anspruch 1. Eine derartige Schraubkappe ist aus FR-A-2 569 661 vorbekannt. Derartige Schraubkappen werden im Spritzgiessverfahren in sehr grossen Stückzahlen hergestellt und dienen zum Verschliessen von Behältern unterschiedlichster Art. Vor allem im Bereich der Erfrischungsgetränke haben sich Schraubkappen aus Kunststoffmaterial durchgesetzt. Dabei werden die Schraubkappen in rasch laufenden Abfüllstrasse automatisch auf die gefüllten Flaschen aufgeschraubt.The invention relates to a screw cap made of plastic material according to the preamble of claim 1. Such a screw cap is previously known from FR-A-2 569 661. Screw caps of this type are produced in very large quantities by injection molding and are used to close containers of the most varied types. Screw caps made of plastic material have become established, particularly in the area of soft drinks. The screw caps are automatically screwed onto the filled bottles in a fast-running filling line.

Ein Problem bei bekannten Schraubkappen besteht darin, dass sie mit einem bestimmten Drehmoment aufgeschraubt werden müssen, um einen dichten Verschluss zu gewährleisten. Die Aufschraubbewegung wird dabei in der Regel dadurch begrenzt, dass die Flaschenmündung am Kappenboden ansteht. Dabei besteht jedoch die Gefahr, dass die Kappe mit einem zu grossen Drehmoment aufgeschraubt wird, so dass sie anschliessend von Hand fast nicht mehr abgeschraubt werden kann. Auch ein Ueberdrehen der Gewindegänge kann in bestimmten Fällen eintreten, da die Flaschenmündungen vor allem bei Glasflaschen grosse Toleranzschwankungen aufweisen.A problem with known screw caps is that they have to be screwed on with a certain torque in order to ensure a tight seal. The screwing motion is usually limited by the fact that the bottle mouth is on the bottom of the cap. However, there is a risk that the cap will be unscrewed with too much torque, so that it can then hardly be unscrewed by hand. In certain cases, the threads can also be overtightened, since the bottle mouths have large tolerance fluctuations, particularly in the case of glass bottles.

Es ist daher eine Aufgabe der Erfindung, die Schraubkappen der eingangs genannten Art so auszubilden, dass die Aufschraubbewegung nicht mehr oder nicht mehr ausschliesslich durch den Kappenboden begrenzt wird, und dass ein Aufschrauben der Kappe auf die Behältermündung mit einem zu grossen Drehmoment verhindert wird. Diese Aufgabe wird erfindungsgemäss mit einer Schraubkappe gelöst, welche die Merkmale im Anspruch 1 aufweist.It is therefore an object of the invention to design the screw caps of the type mentioned in such a way that the screw-on movement is no longer or no longer limited exclusively by the cap base, and that screwing of the cap onto the container mouth is prevented with excessive torque. This object is achieved according to the invention with a screw cap, which has the features in claim 1.

Das im Bereich der Schraubenlinie des Behälter-Aussengewindes angeordnete Bremselement bewirkt eine Blockierung des Aufschraubvorgangs, ohne dass dabei die Behältermündung mit dem vollen Drehmoment am Kappenboden aufläuft. Beim Auflaufen des Aussengewindes auf das Bremselement werden die Aufschraubkräfte in eine radiale Kraftkomponente umgewandelt, da das Aussengewinde bestrebt ist, das Bremselement zu überwinden und damit radial nach aussen zu verdrängen.The braking element arranged in the area of the screw line of the external container thread causes the screwing-on process to be blocked without the container opening running onto the cap base with the full torque. When the external thread runs onto the braking element, the screwing forces are converted into a radial force component, since the external thread tries to overcome the braking element and thus to displace it radially outwards.

Je nach der Ausgestaltung des Bremselements und nach den elastizitätseigenschaften des Materials kann der Stillstand der Schraubkappe mit einer Verzögerung herbeigeführt werden. Dabei ist es besonders vorteilhaft, wenn das Bremselement eine Auflaufflanke aufweist, die etwa parallel zur Mittelachse der Kappe verläuft. Ausserdem kann die Auflaufflanke zu einer durch die Mittelachse der Kappe verlaufenden ebene geneigt sein. Die Auflaufflanke ist dann wie eine Rampe ausgebildet, auf der das Aussengewinde mit zunehmender radialer Spannung aufläuft.Depending on the design of the braking element and the elastic properties of the material, the stoppage of the screw cap can be brought about with a delay. It is particularly advantageous if the braking element has a run-up flank that runs approximately parallel to the central axis of the cap. In addition, the run-up flank can be inclined to a plane running through the central axis of the cap. The run-up flank is then designed like a ramp on which the external thread runs with increasing radial tension.

Das Bremselement kann in den Gewindegang des Innengewindes integriert sein, oder es kann vom Gewindegang des Innengewindes getrennt ausgebildet sein. Das Bremselement kann auch einen als Gewindeflanke für das Innengewinde ausgebildeten Wandabschnitt aufweisen. Auf diese Weise erhält das Bremselement noch eine zusätzliche Funktion. Diese Funktion kann noch erweitert werden, wenn die Schraubkappe nahe am Kappenboden eine oder mehrere Stützrippen zum Festhalten einer eingelegten Dichtungsscheibe aufweist, und wenn das Bremselement einen Wandabschnitt aufweist, der in der ebene der Stützrippen verläuft. Dadurch liegt ein Teil der Dichtungsscheibe auf dem Bremselement auf.The braking element can be integrated in the thread of the internal thread, or it can be formed separately from the thread of the internal thread. The braking element can also have a wall section designed as a thread flank for the internal thread. In this way, the braking element is given an additional function. This function can be expanded if the screw cap has one or more support ribs close to the cap base for holding an inserted sealing washer, and if the braking element has a wall section which runs in the plane of the support ribs. As a result, part of the sealing washer rests on the brake element.

Die erwähnten Mehrfachfunktionen des Bremselements können besonders einfach dadurch erreicht werden, dass es in der Draufsicht die Form eines Keils aufweist, der sich über einen Sektor von wenigstens 90° erstreckt. An der Schmalseite des Keils ist dabei die Auflaufflanke angeordnet, die eine bestimmte Minimalbreite haben muss, damit auch bei Toleranzschwankungen der Gewindeanfang des Aussengewindes immer auf das Bremselement aufläuft.The multiple functions of the braking element mentioned can be achieved in a particularly simple manner in that it has the shape of a wedge in plan view that extends over one Sector extends from at least 90 °. The run-up flank is arranged on the narrow side of the wedge, which must have a certain minimum width so that the thread start of the external thread always runs onto the braking element even in the event of tolerance fluctuations.

Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und wird nachstehend genauer beschrieben. Es zeigen:

Figur 1
einen querschnitt durch eine erfindungsgemässe Schraubkappe,
Figur 2
einen querschnitt durch die auf eine Behältermündung aufgeschraubte Schraubkappe gemäss Figur 1,
Figur 3
einen Teilquerschnitt durch die Verschlussanordnung gemäss Figur 2,
Figur 4
eine Abwicklung der Kappeninnenwand in etwas verkleinertem Massstab,
Figuren 5 und 6
Draufsichten auf abgewandelte Ausführungsbeispiele von Bremselementen,
Figur 7
ein als umlaufende Rippe ausgebildetes Bremselement,
Figur 8
ein abgewandeltes Ausführungsbeispiel an einer Kappe mit einem abreissbaren Garantieband, und
Figur 9
einen Schnitt durch die ebene I-I gemäss Figur 8.
An embodiment of the invention is shown in the drawings and will be described in more detail below. Show it:
Figure 1
a cross section through a screw cap according to the invention,
Figure 2
2 shows a cross section through the screw cap screwed onto a container mouth according to FIG. 1,
Figure 3
3 shows a partial cross section through the closure arrangement according to FIG. 2,
Figure 4
a development of the inner wall of the cap on a somewhat reduced scale,
Figures 5 and 6
Top views of modified exemplary embodiments of brake elements,
Figure 7
a braking element designed as a circumferential rib,
Figure 8
a modified embodiment of a cap with a tear-off guarantee tape, and
Figure 9
a section through the plane II according to Figure 8.

In Figur 1 ist eine Schraubkappe 1 dargestellt, die im wesentlichen aus einem Kappenboden 2 und einer sich daran anschliessenden, etwa zylindrischen Kappenwand 3 besteht. Im Uebergangsbereich 5 zwischen Kappenboden 2 und Kappenwand 3 ist die Schraubkappe abgerundet. Auf der Innenseite der Kappenwand 3 ist das Innengewinde 4 angeordnet, das ca. 1½ Gewindegänge aufweist. Diese sind durch Entlüftungsschlitze 11 unterbrochen, die beim Abschrauben der Kappe einen raschen Druckabbau bewirken, wenn im Behälter ein Ueberdruck herrscht.A screw cap 1 is shown in FIG. 1, which essentially consists of a cap base 2 and an adjoining, approximately cylindrical cap wall 3. in the Transition area 5 between cap base 2 and cap wall 3, the screw cap is rounded. On the inside of the cap wall 3, the internal thread 4 is arranged, which has approximately 1½ threads. These are interrupted by ventilation slots 11, which bring about a rapid reduction in pressure when the cap is unscrewed if there is excess pressure in the container.

Nahe am Kappenboden 2 bzw. am Uebergangsbereich 5 sind an der Kappenwand 3 Stützrippen 13 angeordnet. Diese Stützrippen dienen dazu, eine Dichtungsscheibe 12 aus elastischem Material festzuhalten. Wie aus Figur 2 ersichtlich ist, wird diese Dichtungsscheibe bei aufgeschraubter Kappe nach oben geschoben, wobei sie sich dichtend um den Mündungsbereich legt.Support ribs 13 are arranged on the cap wall 3 close to the cap base 2 or at the transition region 5. These support ribs serve to hold a sealing washer 12 made of elastic material. As can be seen from FIG. 2, this sealing washer is pushed upwards when the cap is screwed on, whereby it lies sealingly around the mouth region.

Am Gewindeende 7 des Innengewindes 4 ist ein Bremselement 15 angeordnet, das etwas weniger tief ausgebildet ist als die Flanken des Innengewindes 4. Wie Figur 4 zeigt, ist das Bremselement in der Draufsicht als langgestreckter Keil ausgebildet. es ist nicht mit dem Gewindeende 7 verbunden, sondern beginnt unmittelbar nach einem Entlüftungsschlitz 11. Das Bremselement erstreckt sich über den Sektor von A bis B über etwas mehr als 180°.At the threaded end 7 of the internal thread 4 there is a braking element 15 which is somewhat less deep than the flanks of the internal thread 4. As FIG. 4 shows, the braking element is designed as an elongated wedge in plan view. it is not connected to the threaded end 7, but begins immediately after a vent slot 11. The braking element extends over the sector from A to B over a little more than 180 °.

Das Bremselement hat eine Auflaufflanke 16, die zu einer durch die Mittelachse der Kappe verlaufenden ebene in einem Winkel Alpha geneigt ist, wie aus Figur 3 hervorgeht. Die Auflaufflanke verläuft im übrigen jedoch parallel zur Mittelachse, so dass beim Auflaufen des Gewindeanfangs 10 eine radiale Kraftkomponente in Pfeilrichtung X gebildet wird.The braking element has a run-up flank 16 which is inclined at an angle alpha to a plane running through the central axis of the cap, as can be seen from FIG. 3. The run-up flank, however, runs parallel to the central axis, so that a radial force component in the direction of the arrow X is formed when the thread start 10 runs up.

Das Bremselement weist einen Wandabschnitt 14 auf, der im Steigungswinkel des Innengewindes 4 geneigt ist und der praktisch die Funktion einer Gewindeflanke erfüllt. Anderseits hat das Bremselement auch noch einen Wandabschnitt 15, der in der ebene der Stützrippen 13 liegt. Dadurch bildet der Wandabschnitt 15 eine Fortsetzung der Stützrippen 13, auf denen die Dichtungsscheibe 12 aufliegt. Die Stützrippen 13 sind an den Entlüftungsschlitzen 11 unterbrochen, um einen optimalen Druckabbau zu gewährleisten. es wäre aber auch denkbar, eine einzige, zusammenhängende Stützrippe anzuordnen.The braking element has a wall section 14 which is inclined at the pitch angle of the internal thread 4 and which practically fulfills the function of a thread flank. On the other hand, the braking element also has a wall section 15, which in the level of the support ribs 13 lies. As a result, the wall section 15 forms a continuation of the support ribs 13 on which the sealing washer 12 rests. The support ribs 13 are interrupted at the ventilation slots 11 in order to ensure optimum pressure reduction. but it would also be conceivable to arrange a single, contiguous support rib.

Das in Figur 4 dargestellte keilförmige Bremselement 6 hat ersichtlicherweise eine Mehrfachfunktion, indem es als Anschlag für das Aussengewinde, als Gewindeflanke und als Stützschulter für die Dichtungsscheibe dient. Diese Konfiguration ist auch spritzgiesstechnisch und werkzeugtechnisch besonders vorteilhaft und lässt sich leicht entformen.The wedge-shaped brake element 6 shown in FIG. 4 obviously has a multiple function in that it serves as a stop for the external thread, as a thread flank and as a support shoulder for the sealing disk. This configuration is also particularly advantageous in terms of injection molding and tooling and can be easily removed from the mold.

Ersichtlicherweise muss das Bremselement 6 nicht zwingend die im Ausführungsbeispiel gezeigte Keilform aufweisen. Bei Verschlusskappen mit alternativen Dichtungssystemen kann ohne weiteres auch der Wandabschnitt 15 wegfallen bzw. eine andere Relativlage einnehmen. Die Konfiguration des Bremselements muss in jedem Fall so sein, dass es immer im Bereich der Schraubenlinie für das Aussengewinde liegt.Obviously, the braking element 6 does not necessarily have to have the wedge shape shown in the exemplary embodiment. In the case of sealing caps with alternative sealing systems, the wall section 15 can easily be omitted or take a different relative position. The configuration of the braking element must always be such that it is always in the area of the screw line for the external thread.

Die Figuren 5 und 6 zeigen alternative Konfigurationen von Bremselementen. Die radiale Tiefe kann dabei etwa gleich sein wie beim Ausführungsbeispiel gemäss den Figuren 1 bis 4.Figures 5 and 6 show alternative configurations of brake elements. The radial depth can be approximately the same as in the exemplary embodiment according to FIGS. 1 to 4.

Gemäss Figur 5 ist das Bremselement 6 einstückig mit dem Gewindeende 7 des Innengewindes verbunden und erstreckt sich wie eine Fahne in die Schraubenlinie des Aussengewindes. Der Gewindeanfang 10 des Aussengewindes läuft ebenfalls frontal auf dem Bremselement 6 auf. Beim Ausführungsbeispiel gemäss Figur 6 ist das Bremselement 6 U-förmig ausgebildet und völlig separat angeordnet. Der untere Schenkel könnte aber theoretisch auch die Fortsetzung des Innengewindes bilden. Der Gewindeanfang 10 des Aussengewindes läuft hier nicht frontal, sondern an den beiden Flanken am Bremselement auf.According to Figure 5, the braking element 6 is integrally connected to the threaded end 7 of the internal thread and extends like a flag in the helix of the external thread. The thread start 10 of the external thread also runs frontally on the braking element 6. In the exemplary embodiment according to FIG. 6, the braking element 6 is U-shaped and is arranged completely separately. The lower leg could theoretically also form the continuation of the internal thread. The thread start 10 of the external thread does not run frontally here, but on the two flanks on the braking element.

Beim Ausführungsbeispiel gemäss Figur 7 ist das Bremselement 6 als Rippe ausgebildet, die sich über den gesamten Umfang der Kappenwand 3 oder auch nur über einen bestimmten Sektor erstrecken kann. Beim Aufschrauben läuft die Unterseite 17 der Rippe auf dem Anfang des Aussengewindes 9 auf. Im Gegensatz zur vorher beschriebenen, radial wirkenden Auflaufflanke 16 übt die Unterseite 17 eine axiale Bremskraft aus. Die Rippe könnte z.B. auch noch als Verstärkung des Uebergangsbereiches vom Kappenboden 2 zur Kappenwand 3 dienen.In the exemplary embodiment according to FIG. 7, the braking element 6 is designed as a rib, which can extend over the entire circumference of the cap wall 3 or only over a specific sector. When screwing on, the underside 17 of the rib runs onto the beginning of the external thread 9. In contrast to the previously described, radially acting ramp flank 16, the underside 17 exerts an axial braking force. The rib could e.g. also serve as reinforcement of the transition area from the cap base 2 to the cap wall 3.

Ein alternatives Ausführungsbeispiel einer erfindungsgemässen Schraubkappe ist in den Figuren 8 und 9 dargestellt. Anstelle einer eingelegten Dichtungsscheibe verfügt die Schraubkappe 1 am Kappenboden 2 über eine olivenförmige Innendichtung 21, die beim Aufschrauben in die Flaschenmündung hineingepresst wird. Am unteren Rand der Schraubkappe ist über abreissbare Stege ein Garantieband 18 angeordnet, das auf der Innenseite mit wenigstens einem Rückhalteelement versehen ist. An der Behältermündung 8 ist ein umlaufender Wulst 19 vorgesehen, unter dem das Rückhalteelement 20 beim erstmaligen Aufschrauben der Kappe einrastet. Beim erstmaligen Abschrauben derKappe wird das Garantieband ganz oder teilweise vom unteren Kappenrand abgetrennt, so dass ein erstmaliges Oeffnen angezeigt wird. Derartige Garantiebänder sind dem Fachmann bereits bekannt, wobei die Rückhalteelemente verschiedene Formen, wie z.B. Hocken, Zungen, Wulste usw. haben können.An alternative embodiment of a screw cap according to the invention is shown in FIGS. 8 and 9. Instead of an inserted sealing washer, the screw cap 1 has an olive-shaped inner seal 21 on the cap base 2, which is pressed into the bottle mouth when screwed on. At the lower edge of the screw cap, a guarantee tape 18 is arranged over tear-off webs, which is provided on the inside with at least one retaining element. At the container mouth 8, a circumferential bead 19 is provided, under which the retaining element 20 engages when the cap is screwed on for the first time. When the cap is unscrewed for the first time, the guarantee band is completely or partially separated from the lower edge of the cap, so that a first opening is indicated. Such guarantee tapes are already known to the person skilled in the art, the retaining elements having different shapes, e.g. Squats, tongues, beads, etc. may have.

Das Bremselement 6 ist nun besonders vorteilhaft so angeordnet, dass seine Bremswirkung beim erstmaligen Aufschrauben der Kappe unmittelbar nach dem einrasten des Rückhalteelementes 20 unter dem Wulst 19 einsetzt. Je nach der Beschaffenheit der Rückhalteelemente kann es nämlich für die Funktion des Garantiebandes bedeutsam sein, dass das Garantieband eine bestimmte Relativlage zum Wulst 19 nicht überschreitet. Das Bremselement 6 könnte aber auch derart angeordnet werden, dass die Bremswirkung bereits vor dem einrasten des Rückhalteelements einsetzt und dass beim Beenden des Bremsvorgangs, d.h. beim Stillstand der Schraubkappe, die einrastposition gerade erreicht wird.The braking element 6 is now particularly advantageously arranged in such a way that its braking action begins when the cap is screwed on for the first time immediately after the retaining element 20 engages under the bead 19. Depending on the nature of the retaining elements, it can be important for the function of the guarantee band that the guarantee band does not exceed a certain position relative to the bead 19. The braking element 6 could also be arranged in such a way that the braking effect starts before the retaining element engages and that when the braking process is ended, ie when the screw cap is at a standstill, the engaging position is just reached.

Beim Ausführungsbeispiel gemäss den Figuren 8 und 9 besteht das Bremselement aus einer Rippe bzw. aus einer Verdickung im Uebergangsbereich 5 der Kappe. Die Rippe erstreckt sich über einen Winkel Beta von ca. 75°. Der innere Radius r der Rippe ist kleiner als die Hälfte des Durchmessers d des Aussengewindes 9. Damit läuft der Gewindeanfang 10 des Aussengewindes auf der Auflaufflanke 16 auf, drückt die Rippe 6 radial nach aussen und bewirkt durch die erhöhte Reibung nach einer bestimmten Bogenlänge den Stillstand der Schraubkappe.In the exemplary embodiment according to FIGS. 8 and 9, the braking element consists of a rib or a thickening in the transition region 5 of the cap. The rib extends over an angle beta of approximately 75 °. The inner radius r of the rib is less than half the diameter d of the external thread 9. The thread start 10 of the external thread thus runs on the run-up flank 16, presses the rib 6 radially outward and brings about standstill due to the increased friction after a certain arc length the screw cap.

Selbstverständlich könnte auch die Schraubkappe gemäss den Figuren 1 bis 3 mit einem Garantieband gemäss Figur 8 versehen werden.Of course, the screw cap according to FIGS. 1 to 3 could also be provided with a guarantee tape according to FIG. 8.

Claims (11)

  1. A screw cap (1) of plastics material comprising a cap end portion (2) and a substantially cylindrical cap wall (3) which adjoins the cap end portion and which has an internal screwthread (4), for closing a container mouth (8) with an external screwthread (9), characterised in that arranged on the cap wall (3) at the end (7) of the internal screwthread (4) which is towards the cap end portion (2) is a braking element (6) which is at least partially disposed in the region of the helical line for the external screwthread (9).
  2. A screw cap according to claim 1 characterised in that the braking element (6) has a run-on flank (16) which extends substantially parallel to the central axis of the cap.
  3. A screw cap according to claim 1 or claim 2 characterised in that the braking element (6) has a run-on flank (16) which is inclined relative to a plane passing through the central axis of the cap.
  4. A screw cap according to one of claims 1 to 3 characterised in that the braking element (6) is integrated into the thread portion of the internal screwthread (4).
  5. A screw cap according to one of claims 1 to 3 characterised in that the braking element (6) is formed separately from the thread portion of the internal screwthread.
  6. A screw cap according to one of claims 1 to 5 characterised in that the braking element has a wall portion (14) which is in the form of the thread flank for the internal screwthread.
  7. A screw cap according to one of claims 1 to 6 characterised in that adjacent the cap end portion (2) it has one or more support ribs (13) for retaining an inserted sealing disc (12) and that the braking element (6) has a wall portion (15) which extends in the plane of the support ribs (13).
  8. A screw cap according to claim 6 or claim 7 characterised in that in plan view the braking element (6) is in the shape of a wedge which extends over a sector of at least 90°.
  9. A screw cap according to claim 1 characterised in that the braking element (6) is a rib which extends at least over a sector of the peripheral region and which is so arranged that when the cap is screwed on the rib runs on the beginning of the thread portion of the external screwthread (9).
  10. A screw cap according to claim 9 characterised in that the rib extends over the entire peripheral region of the cap wall (3).
  11. A screw cap according to one of claims 1 to 10 characterised in that at its lower end it has a guarantee strip (18) which is provided on its inward side with at least one retaining element which when the cap is screwed on can engage under an annular projection at the container mouth, wherein the braking element is so arranged that the braking effect begins immediately after the retaining element comes into engagement.
EP90903756A 1989-03-14 1990-03-09 Plastic screw cap Expired - Lifetime EP0414860B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ES19898900826U ES1009616Y (en) 1989-03-14 1989-03-14 STOP DEVICE FOR PLUG THREADS.
CH1841/89 1989-05-17
CH184189 1989-05-17

Publications (2)

Publication Number Publication Date
EP0414860A1 EP0414860A1 (en) 1991-03-06
EP0414860B1 true EP0414860B1 (en) 1993-09-01

Family

ID=25688811

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90903756A Expired - Lifetime EP0414860B1 (en) 1989-03-14 1990-03-09 Plastic screw cap

Country Status (7)

Country Link
EP (1) EP0414860B1 (en)
KR (1) KR100197824B1 (en)
AT (1) ATE93803T1 (en)
BR (1) BR9005774A (en)
CA (1) CA2027537A1 (en)
ES (1) ES2043360T3 (en)
WO (1) WO1990010581A2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9117270U1 (en) * 1991-08-09 1998-12-10 Hertrampf, Michael, Dr., 30989 Gehrden Screw cap for closing a bottle or the like.
ATE186511T1 (en) * 1994-01-05 1999-11-15 Ewit Ag MACHINE-ATCHABLE PLASTIC SCREW CAP
IL112387A (en) * 1994-02-01 1997-07-13 Crown Cork Ag Screwable closure cap with security against over- tightening
GB2321053A (en) * 1997-01-08 1998-07-15 Massmould Holdings Screw cap with liner
EP1097877A1 (en) * 1999-11-08 2001-05-09 Crown Cork & Seal Technologies Corporation Closure cap

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3435978A (en) * 1967-01-23 1969-04-01 John C Wittwer Bottle cap with interlocking threads
US4464316A (en) * 1982-07-23 1984-08-07 Baxter Travenol Laboratories, Inc. Non-refillable humidifier container
FR2569661B1 (en) * 1984-09-03 1986-09-19 Mayet Ets CLOSING DEVICE WITH DEFINED ORIENTATION
US4741447A (en) * 1987-04-27 1988-05-03 American National Can Company Linerless cap closure

Also Published As

Publication number Publication date
EP0414860A1 (en) 1991-03-06
KR100197824B1 (en) 1999-06-15
BR9005774A (en) 1991-08-06
WO1990010581A3 (en) 1990-11-29
WO1990010581A2 (en) 1990-09-20
ATE93803T1 (en) 1993-09-15
KR920700152A (en) 1992-02-19
CA2027537A1 (en) 1990-09-15
ES2043360T3 (en) 1993-12-16

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