EP0461067B1 - One piece plastic hinged snap closure - Google Patents

One piece plastic hinged snap closure Download PDF

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Publication number
EP0461067B1
EP0461067B1 EP91810364A EP91810364A EP0461067B1 EP 0461067 B1 EP0461067 B1 EP 0461067B1 EP 91810364 A EP91810364 A EP 91810364A EP 91810364 A EP91810364 A EP 91810364A EP 0461067 B1 EP0461067 B1 EP 0461067B1
Authority
EP
European Patent Office
Prior art keywords
spring elements
hinge
closure
snap
film hinge
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
EP91810364A
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German (de)
French (fr)
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EP0461067A1 (en
Inventor
Werner Fritz Dubach
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.)
Medisize Schweiz AG
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Createchnic AG
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Filing date
Publication date
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Publication of EP0461067A1 publication Critical patent/EP0461067A1/en
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Publication of EP0461067B1 publication Critical patent/EP0461067B1/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
    • B65D47/00—Closures with filling and discharging, or with discharging, devices
    • B65D47/04—Closures with discharging devices other than pumps
    • B65D47/06—Closures with discharging devices other than pumps with pouring spouts or tubes; with discharge nozzles or passages
    • B65D47/08—Closures with discharging devices other than pumps with pouring spouts or tubes; with discharge nozzles or passages having articulated or hinged closures
    • B65D47/0804—Closures with discharging devices other than pumps with pouring spouts or tubes; with discharge nozzles or passages having articulated or hinged closures integrally formed with the base element provided with the spout or discharge passage
    • B65D47/0809—Closures with discharging devices other than pumps with pouring spouts or tubes; with discharge nozzles or passages having articulated or hinged closures integrally formed with the base element provided with the spout or discharge passage and elastically biased towards both the open and the closed positions
    • B65D47/0814—Closures with discharging devices other than pumps with pouring spouts or tubes; with discharge nozzles or passages having articulated or hinged closures integrally formed with the base element provided with the spout or discharge passage and elastically biased towards both the open and the closed positions by at least three hinge sections, at least one having a length different from the others

Definitions

  • the functionality comprises two essential criteria, namely the tightness, the most important task of each closure and the snap effect, the characteristic of a snap closure. Every snap hinge closure achieves the required tightness today, but the snap action is very different with the different closures. This is understandable if you know how complex the interaction of the different Forces and how this is influenced by the geometry of the closure and its hinge. The force for producing the snap action is always also caused by the elasticity of the bending. It is possible to use a spring element or to design the geometry of the closure in such a way that the spring action takes place through elastic deformation of parts of the closure.
  • the first variant which works with spring elements, has been known for many years and has a toggle lever as a spring element.
  • the second variant works with so-called tensioning straps, which connect the cap and the lower part to one another and with at least one film hinge in between, via which the two parts are pivotally connected to one another.
  • the object of the present invention is to show the designer means which allow him to create closures even when using tensioning straps, which enables almost any desired characteristic with regard to the snap action to be achieved.
  • This configuration leads to the spring elements acting like a spring bar in the attachment area on the parts of the plastic closure and acting like a tensioning band in the central area.
  • the snap hinge closure has a cylindrical shape, it is advantageous to decrease the thickness of the spring elements at the points farther away from the film hinge than at the closer sides from the attachment points towards the center in the longitudinal direction. This allows the different swivel distance compensate for which the individual phases of a belt move depending on the distance from the pivot axis.
  • FIG. 1 shows a rear view of a one-piece plastic closure with a lower part 1 and a cap 2 connected to it in an articulated manner.
  • the parting plane between cap 2 and lower part 1 is denoted by T.
  • the cylindrical closure shown in the drawing has a film hinge 3, which connects the two closure parts and protrudes slightly from the two vertically superimposed jacket walls of both closure parts 1 and 2. This protrusion of the film hinge 3 is unavoidable if the closure is to be injected in the fully open position. Otherwise, the jacket walls of the lower part and lid would touch when fully open.
  • the two lateral spring elements 4 can be seen to the left and right of the film hinge 3.
  • the spring elements 4 are integrated in the jacket walls of the two closure parts, that is to say the spring elements are aligned with the outer surface of the jacket walls of both closure parts in the closed position of the closure and go to the attachment points 5 directly into the jacket walls of both closure parts.
  • the spring elements 4 have two different areas with different functions. This can be seen most clearly in FIGS. 2 and 3. Directly from the corresponding jacket wall of the lower part 1 or the cap 2, the two regions 40 and 40 'of the spring element emerge with the same wall thickness. These areas essentially work as spring bars fixed on one side, which build up bending forces in particular when the lock is actuated and thus deform elastically.
  • the magnitude of the bending forces are dependent on the one hand on the selected material, which here is preferably polypropylene and the geometric conditions, namely the width, length and thickness of the thick regions 40 and 40 ', of the spring elements 4.
  • This thinned area 41 has the same function as the known tensioning straps, namely the transmission of tensile force from one closure part to the other.
  • the elastic change in length that occurs is minimal.
  • An additional element in order to vary the snap action is to have the transition from thin-walled area 41 to thick-walled area 40 or 40 'curved or inclined.
  • the one drawn in the sealing jacket wall The course of the transition from thin to thick wall thickness is a simplification that only approximates the actual conditions.
  • the curved course shown in dashed lines in the drawing corresponds more closely to the realities.
  • the total wall thickness of the spring elements 4 can also be varied from the side lying higher on the film hinge 3 to the remote side. This changes the balance of power again.
  • the designer is now able to make this complex adjustment only on the actual hinge. Corresponding corrections are thus predictable in their effect.
  • Appropriate interchangeable inserts on the injection mold make it possible to produce a closure of the same shape with different closing characteristics. This makes it possible to meet customer requirements in a very specific way without having to produce a completely new injection mold every time.

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

Abstract

The closure consists of a lower part (1) and a cap (2), which are connected to each other by at least one film hinge (3). Spring elements (4) integrally formed from the jacket walls of the two closure parts are disposed on both sides of the film hinge (3). The thickness of the spring elements (4) varies between the shoulder points (5) of the spring elements. In the area of the shoulder points the thickness is approximately the same as the wall thickness of the jacket walls, and in the center, that is, in the area extending over the plane of separation, it is considerably less. The variation of the wall thickness permits a customer-specific adaptation of the snap action of the closure without having to make it in a completely new way every time.

Description

Für den kommerziellen Erfolg eines Kunststoffverschlusses sind Funktionalität, Verarbeitbarkeit und Aesthetik die drei Hauptpunkte. Der vierte Punkt ist der Preis, der zwar nach wie vor auch bedeutend ist, doch sind hier kaum grosse Unterschiede vorhanden, solange es sich um einteilige Verschlüsse handelt, die sich mit Spritzformen ohne Schieber fertigen lassen.Functionality, workability and aesthetics are the three main points for the commercial success of a plastic closure. The fourth point is the price, which is still significant, but there are hardly any major differences as long as it is one-piece closures that can be manufactured with injection molds without a slide.

Die Funktionalität umfasst zwei wesentliche Kriterien, nämlich die Dichtigkeit, die wesentlichste Aufgabe jedes Verschlusses und die Schnappwirkung, das Charakteristikum eines Schnappverschlusses. Die erforderliche Dichtigkeit erreicht heute jeder Schnappscharnierverschluss, hingegen ist die Schnappwirkung bei den verschiedenen Verschlüssen sehr unterschiedlich. Dies ist verständlich, wenn man weiss, wie komplex das Zusammenwirken der verschiedenen Kräfte ist, und wie diese durch die Geometrie des Verschlusses und deren Scharnier beeinflusst wird.
Die Kraft zur Erzeugung der Schnappwirkung wird immer auch durch die Biegeelastizität bewirkt. Dabei ist es möglich, ein Federelement zu verwenden oder aber die Geometrie des Verschlusses so zugestalten, dass die Federwirkung durch elastische Verformung von Teilen des Verschlusses erfolgt. Die erste Variante, die mit Federelementen arbeitet, ist schon seit vielen Jahren bekannt und weist einen Kniehebel als Federelement auf. Die zweite Variante arbeitet mit sogenannten Spannbändern, die die Kappe und den Unterteil miteinander verbinden und mit mindestens einem dazwischen liegenden Filmscharnier über dem die beiden Teile miteinander schwenkbar verbunden sind.The functionality comprises two essential criteria, namely the tightness, the most important task of each closure and the snap effect, the characteristic of a snap closure. Every snap hinge closure achieves the required tightness today, but the snap action is very different with the different closures. This is understandable if you know how complex the interaction of the different Forces and how this is influenced by the geometry of the closure and its hinge.
The force for producing the snap action is always also caused by the elasticity of the bending. It is possible to use a spring element or to design the geometry of the closure in such a way that the spring action takes place through elastic deformation of parts of the closure. The first variant, which works with spring elements, has been known for many years and has a toggle lever as a spring element. The second variant works with so-called tensioning straps, which connect the cap and the lower part to one another and with at least one film hinge in between, via which the two parts are pivotally connected to one another.

In der vorliegenden Erfindung wird insbesondere von der EP-A-0′291′457 der Anmelderin ausgegangen, aus der ein einteiliger Schnappscharnierverschluss aus Kunststoff mit einem Unterteil und einer damit gelenkig verbundenen Kappe bekannt ist, die je eine Mantelwand aufweist, die in der geschlossenen Stellung des Verschlusses deckungsgleich vertikal übereinander stehen und über mindestens einem in der Trennebene liegenden Filmscharnieres miteinander verbunden sind und zwei in die Mantelwände beider Teile integrierte, die Schnappwirkung erzeugende Federelemente, die beidseitig des Filmscharniers angeordnet sind.In the present invention, in particular from the EP-A-0'291'457 of the applicant, from which a one-piece snap hinge closure made of plastic with a lower part and an articulated cap is known, each having a jacket wall, which in the closed The position of the closure is congruent vertically one above the other and is connected to one another via at least one film hinge lying in the parting plane and two integrated into the jacket walls of both parts, the snap effect spring elements which are arranged on both sides of the film hinge.

Aufgabe der vorliegenden Erfindung ist es dem Konstrukteur Mittel zu zeigen, die es ihm erlauben auch bei Verwendung von Spannbänder Verschlüsse zu schaffen, die fast jede beliebige Charakteristik bezüglich der Schnappwirkung zu erzielen erlaubt.The object of the present invention is to show the designer means which allow him to create closures even when using tensioning straps, which enables almost any desired characteristic with regard to the snap action to be achieved.

Diese Aufgabe löst ein Kunststoffverschluss gemäss Oberbegriff mit den kennzeichnenden Merkmalen des Patentanspruches 1.This object is achieved by a plastic closure according to the preamble with the characterizing features of patent claim 1.

Diese Ausgestaltung führt dazu, dass die Federelemente im Ansatzbereich an den Teilen des Kunststoffverschlusses wie ein Federstab und im mittleren Bereich gleich einem Spannband wirken.This configuration leads to the spring elements acting like a spring bar in the attachment area on the parts of the plastic closure and acting like a tensioning band in the central area.

Hat der Schnappscharnierverschluss eine zylindrische Form, so ist vorteilhaft, die Dicke der Federelemente an den dem Filscharnier weiter entfernten stellen schneller als an den näher liegenden Seiten von den Ansatzstellen zur Mitte hin in Längsrichtung abnehmen.
Hierdurch lässt sich die unterschiedliche Schwenkstrecke kompensieren, die die einzelnen Phasen eines Bandes in Abhängigkeit von der Entfernung von der Schwenkachse durchwandern.If the snap hinge closure has a cylindrical shape, it is advantageous to decrease the thickness of the spring elements at the points farther away from the film hinge than at the closer sides from the attachment points towards the center in the longitudinal direction.
This allows the different swivel distance compensate for which the individual phases of a belt move depending on the distance from the pivot axis.

In der Zeichnung ist ein Ausführungsbeispiel des Erfindungsgegenstandes dargestellt und anhand der nachfolgenden Beschreibung erläutert. Es zeigt:

Figur 1
die rückseitige Ansicht eines Kunststoffverschlusses auf das Schnappscharnier;
Figur 2
einen Längsschnitt durch das Federelement entlang der Linie A-A in Figur 1 und;
Figur 3
einen gleichen Längsschnitt entlang der Linie B-B;
Figur 4
eine vergrösserte Ansicht auf das Schnappscharnier nach Figur 1.
In the drawing, an embodiment of the subject matter of the invention is shown and explained using the following description. It shows:
Figure 1
the rear view of a plastic closure on the snap hinge;
Figure 2
a longitudinal section through the spring element along the line AA in Figure 1 and;
Figure 3
a same longitudinal section along the line BB;
Figure 4
2 shows an enlarged view of the snap hinge according to FIG. 1.

In der Zeichnung erkennt man in der Figur 1 eine rückseitige Ansicht eines einteiligen Kunststoffverschlusses mit einem Unterteil 1 und einer damit gelenkig verbundenen Kappe 2. Die Trennebene zwischen Kappe 2 und Unterteil 1 ist mit T bezeichnet. Der in der Zeichnung dargestellte zylindrische Verschluss hat ein Filmscharnier 3, welches die beiden Verschlussteile verbindet und gegenüber den beiden vertikal übereinander stehenden Mantelwände beider Verschlussteile 1 und 2 leicht vorsteht. Dieses Vorstehen des Filmscharnieres 3 ist unabbringbar, wenn der Verschluss in vollständig offener Stellung gespritzt werden soll. Andernfalls würden die Mantelwände von Unterteil und Deckel in vollständig geöffnetem Zustand sich berühren.1 shows a rear view of a one-piece plastic closure with a lower part 1 and a cap 2 connected to it in an articulated manner. The parting plane between cap 2 and lower part 1 is denoted by T. The cylindrical closure shown in the drawing has a film hinge 3, which connects the two closure parts and protrudes slightly from the two vertically superimposed jacket walls of both closure parts 1 and 2. This protrusion of the film hinge 3 is unavoidable if the closure is to be injected in the fully open position. Otherwise, the jacket walls of the lower part and lid would touch when fully open.

Links und rechts des Filmscharnieres 3 erkennt man die beiden seitlichen Federelemente 4. Die Federelemente 4 sind in den Mantelwänden der beiden Verschlussteile integriert, das heisst die Federelemente fluchten in der geschlossenen Lage des Verschlusses mit der Aussenfläche der Mantelwänden beider Verschlussteile und gehen an den Ansatzstellen 5 direkt in die Mantelwände beider Verschlussteile über.
Die Federelemente 4 haben zwei verschiedene Bereiche unterschiedlicher Funktionen. Am Deutlichsten erkennt man dies in den Figuren 2 und 3. Direkt aus der entsprechenden Mantelwand des Unterteiles 1 oder der Kappe 2 gehen mit gleicher Wandstärke die beiden Bereiche 40 und 40′ des Federelementes hervor. Diese Bereiche wirken im wesentlichen als einseitig fixierte Federstäbe, die bei der Betätigung des Verschlusses insbesondere Biegekräfte aufbauen und somit biegeeleastisch sich verformen.
Die Grösse der Biegekräfte sind einerseits vom gewählten Material abhängig, welches hier vorzugsweise Polypropylen ist und den geometrischen Bedingungen, nämlich Breite, Länge und Dicke der dicken Bereiche 40 und 40′, der Federelemente 4.The two lateral spring elements 4 can be seen to the left and right of the film hinge 3. The spring elements 4 are integrated in the jacket walls of the two closure parts, that is to say the spring elements are aligned with the outer surface of the jacket walls of both closure parts in the closed position of the closure and go to the attachment points 5 directly into the jacket walls of both closure parts.
The spring elements 4 have two different areas with different functions. This can be seen most clearly in FIGS. 2 and 3. Directly from the corresponding jacket wall of the lower part 1 or the cap 2, the two regions 40 and 40 'of the spring element emerge with the same wall thickness. These areas essentially work as spring bars fixed on one side, which build up bending forces in particular when the lock is actuated and thus deform elastically.
The magnitude of the bending forces are dependent on the one hand on the selected material, which here is preferably polypropylene and the geometric conditions, namely the width, length and thickness of the thick regions 40 and 40 ', of the spring elements 4.

Zwischen den eben beschriebenen Dickenbereiche der Federelemente 4 verbleibt ein Bereich 41 mit erheblich geringerer Wandstärke. Dieser verdünnte Bereich 41 hat die Funktion gleich den bekannten Spannbändern, nämlich die Uebertragung von Zugkraft von einem Verschlussteil auf den Anderen. Die dabei auftretende elastische Längenveränderung ist minim. In der Folge findet eine gewisse Stauchung der dem Filmscharnier 3 angrenzenden Wandpartien statt, die eine verstärkte Schnappwirkung des Verschlusses bewirkt.
Ein zusätzliches Element um die Schnappwirkung zu variieren besteht darin, den Uebergang vom dünnwandigen Bereich 41 zum dickwandigen Bereich 40 beziehungsweise 40′ gekrümmt beziehungsweise geneigt verlaufen zu lassen. Der in der Verschlussmantelwand eingezeichnete Verlauf des Ueberganges von der dünnen zur dicken Wandstärke ist eine Vereinfachung, die die tatsächlichen Verhältnissen nur angenähert wiedergibt. Der gekrümmte, in der Zeichnung strichliniert angegebene Verlauf entspricht den Realitäten genauer.Between the thickness ranges of the spring elements 4 just described there remains an area 41 with a considerably smaller wall thickness. This thinned area 41 has the same function as the known tensioning straps, namely the transmission of tensile force from one closure part to the other. The elastic change in length that occurs is minimal. As a result, there is a certain compression of the wall parts adjacent to the film hinge 3, which causes an increased snap action of the closure.
An additional element in order to vary the snap action is to have the transition from thin-walled area 41 to thick-walled area 40 or 40 'curved or inclined. The one drawn in the sealing jacket wall The course of the transition from thin to thick wall thickness is a simplification that only approximates the actual conditions. The curved course shown in dashed lines in the drawing corresponds more closely to the realities.

Aber auch die gesamte Wandstärke der Federelemente 4 kann von der dem Filmscharnier 3 höher liegenden Seite zur abgelegenen Seite hin variiert werden. Dies verändert die Kräfteverhältnisse nochmals.
Im Gegensatz zu den üblichen Federelementen, die kaum variiert werden konnten und bei der, die Schnappwirkung fast lediglich von der Geometrie der beiden Verschlussteile, nämlich Deckel und Unterteil abhing, ist nunmehr dem Konstrukteur die Möglichkeit gegeben, diese komplexe Anpassung nur am eigentlichen Scharnier vorzunehmen. Entsprechende Korrekturen werden so in ihrer Wirkung vorhersehbar.
Durch entsprechende auswechselbare Einsätze an der Spritzform kann ein Verschluss mit gleicher Gestalt mit verschiedenen Schliesscharakteristiken gefertigt werden. Diese erlaubt es, Kundenwünsche ganz spezifisch zu erfüllen, ohne jedesmal eine vollständig neue Spritzform zu fertigen.However, the total wall thickness of the spring elements 4 can also be varied from the side lying higher on the film hinge 3 to the remote side. This changes the balance of power again.
In contrast to the usual spring elements, which could hardly be varied and in which the snap action depended almost exclusively on the geometry of the two locking parts, namely the lid and the lower part, the designer is now able to make this complex adjustment only on the actual hinge. Corresponding corrections are thus predictable in their effect.
Appropriate interchangeable inserts on the injection mold make it possible to produce a closure of the same shape with different closing characteristics. This makes it possible to meet customer requirements in a very specific way without having to produce a completely new injection mold every time.

Claims (5)

  1. One-piece snap hinge closure made from plastic having a base (1) and a cap (2) connected in articulated manner thereto and which in each case have a circumferential wall, which are congruently, vertically superimposed when the closure is in the closed position and are interconnected by means of a film hinge located in the junction plane (T), and two spring elements (4) integrated into the circumferential walls of both parts and producing the snap action, being arranged on either side of the film hinge, characterized in that the spring elements (4) are two strip-like parts, whose thickness gradually decreases from their two attachment points (5) in the longitudinal direction towards the centre, all the attachment points (5) of the spring elements (4) running parallel to the junction plane (T).
  2. Snap hinge closure according to claim 1, characterized in that the thinner area (41) of the spring elements (4) is longer on the sides further removed from the film hinge (3) than on the sides nearer thereto.
  3. Snap hinge closure according to claim 1, characterized in that the thickness of the spring elements, at least in the area of their attachment points (5) and transversely to the longitudinal direction thereof, decreases from the side thereof closer to the film hinge (3) to the side remote from the hinge.
  4. Snap hinge closure according to claim 1, characterized in that at least the central third of the entire length of the spring elements is constantly reduced in thickness.
  5. Snap hinge closure according to claim 2, characterized in that each transition from the thinner area (41) to the thick-walled area (40) of each spring element (4) moves apart to the outside in curved or straight manner from the area close to the film hinge (3).
EP91810364A 1990-06-08 1991-05-10 One piece plastic hinged snap closure Expired - Lifetime EP0461067B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1919/90 1990-06-08
CH1919/90A CH680782A5 (en) 1990-06-08 1990-06-08

Publications (2)

Publication Number Publication Date
EP0461067A1 EP0461067A1 (en) 1991-12-11
EP0461067B1 true EP0461067B1 (en) 1994-10-12

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EP91810364A Expired - Lifetime EP0461067B1 (en) 1990-06-08 1991-05-10 One piece plastic hinged snap closure

Country Status (5)

Country Link
US (1) US5115931A (en)
EP (1) EP0461067B1 (en)
AT (1) ATE112743T1 (en)
CH (1) CH680782A5 (en)
DE (1) DE59103205D1 (en)

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CH667059A5 (en) * 1985-07-23 1988-09-15 Alfatechnic Ag PLASTIC LOCK WITH GUARANTEE BAND.
FR2604154B1 (en) * 1986-09-19 1988-12-30 Astraplastique Sa HINGE CAP DEVICE FOR CLOSING A CONTAINER SUCH AS A BOTTLE, BOTTLE OR THE LIKE
CH672771A5 (en) * 1987-05-13 1989-12-29 Alfatechnic Ag
US4778071A (en) * 1988-02-16 1988-10-18 Owens-Illinois Closure Inc. Closure with snap type hinge
US4793502A (en) * 1988-02-29 1988-12-27 Creative Packaging Corp. Hinged dispensing closure
US4848612A (en) * 1988-02-29 1989-07-18 Creative Packaging Corp. Hinged dispensing closure
US4795044A (en) * 1988-04-21 1989-01-03 Owens-Illinois Closure Inc. Tamper evident closure with snap-type hinge cap

Also Published As

Publication number Publication date
US5115931A (en) 1992-05-26
DE59103205D1 (en) 1994-11-17
ATE112743T1 (en) 1994-10-15
CH680782A5 (en) 1992-11-13
EP0461067A1 (en) 1991-12-11

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