EP0024093A1 - Couvercle facile a ouvrir pour conteneur - Google Patents

Couvercle facile a ouvrir pour conteneur Download PDF

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Publication number
EP0024093A1
EP0024093A1 EP79900187A EP79900187A EP0024093A1 EP 0024093 A1 EP0024093 A1 EP 0024093A1 EP 79900187 A EP79900187 A EP 79900187A EP 79900187 A EP79900187 A EP 79900187A EP 0024093 A1 EP0024093 A1 EP 0024093A1
Authority
EP
European Patent Office
Prior art keywords
score
container lid
protrusion
easy
opening
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.)
Withdrawn
Application number
EP79900187A
Other languages
German (de)
English (en)
Other versions
EP0024093A4 (fr
Inventor
Keiji Taniuchi
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.)
Individual
Original Assignee
Individual
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
Priority claimed from PCT/JP1979/000021 external-priority patent/WO1980001558A1/fr
Application filed by Individual filed Critical Individual
Priority to EP19790900187 priority Critical patent/EP0024093A4/fr
Publication of EP0024093A1 publication Critical patent/EP0024093A1/fr
Publication of EP0024093A4 publication Critical patent/EP0024093A4/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B65D17/28—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness
    • B65D17/401—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness characterised by having the line of weakness provided in an end wall
    • 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
    • B65D2205/00—Venting means

Definitions

  • the present invention relates to an easy-opening container lid for containers such as cans of beverages, oils and the like.
  • a keen edge is left on the remaining portion of the container lid after the tear-off of the opening portion.
  • a person who has happened to step on the container may be injured by the keen torn edge of the container.
  • an infant handling and playing with the opened can may be injured by the keen edge left on the container.
  • a domestic animal who has mistakenly eaten this container may be killed.
  • the keen edge left on the container may injure the lip or finger of the person who drinks from this container.
  • Another disadvantage is that it is necessary to separately form the finger-retaining tab and to attach the latter to the can as an accessory.
  • the first example is shown at Figs. 1 and 2.
  • the fulcrum point 4 of a tab 3 is attached to the container lid 5 such that one end of the tab 3 is superposed on the opening portion 2 of the container lid defined by a score 1 similar to that of the conventional container lid.
  • the other end of the tab 3 is pulled upward, so that the opening portion 2 is severed along the score 1 and pushed into the container 6.
  • This example is not satisfactory in that it necessitates the tab, and in that the keen edge is left on the can lid, although it permits the opening portion 2 to be left united with the remainder portion of the can lid.
  • Figs. 3 and 4 show the second example, in which a score ? similar to that of conventional container lid is formed around fully or partly the opening portion 9. Points 10, 11 are selected and designated on the score 7. In the opening operation,-these points are depressed to partially open the container lid and, then, the opening portion 9 is further pressed toward the container 12 - thereby to open the container lid.
  • This example can satisfy the demands for leaving the opened part not fully separated from the remainder portion of the container lid and for the elimination of the tab.
  • this example poses a new problem or danger that the finger may be injured during depression on the score.
  • the aforementioned problem concerning the keen edge left on the remainder part of the container lid is left unsolved.
  • Figs. 5 and 6 show a third example in which the opening portion is beforehand punched from the container top 13.
  • depressable members 14 for opening the container lid having a shape resembling a push-button, are formed separately and joined to the opening portion. The juncture between the depressable members 14 and the opening portion is sealed with an adhesive sealant 15 thereby to attach the depressable members 14 to the container lid.
  • the depressable members 14 are depressed into the container 16, so that the sealant 15 is broken to allow the container lid to open.
  • the present invention aims at providing a depression opening type easy-opening container lid supported by a distinguished press work technique and forming technique, thereby to overcome the aforementioned problems of the prior art.
  • an object of the invention is to provide an easy-opening container lid in which the opened portion does not have a keen edge thereon when it leaves the remaining part of the container lid and the tab or other attachment is eliminated, and in which the keen edge is not left on the remainder portion of the container lid thanks to the use of specific scores which have already been proposed by the present inventor.
  • a protrusion 18 is formed by a deep drawing on a single web 17.
  • a score 19 is formed fully or partially around the protrusion to define the opening portion.
  • the score is broken into a state shown in Fig. 8.
  • the opening portion including the protrusion 18 drops into the container if the score 19 is formed over the entire circumference of the protrusion, but is left unseparated if the score 19 is formed only partially around the protrusion.
  • a winding line is used to represent the score 19. This mark, however, does not express the actual form of the score, but represents all types of score 19 symbolically.
  • the protrusion 18 is essential for effectively applying the depression force to the score 19 as a shearing force.
  • the protrusion is not provided, i.e. if the score is formed merely in a flat plate, to define the opening portion, the depressing force applied to the opening portion is decomposed into a shearing force and a tensile force for tensioning the plate, so that the tearing effect is reduced considerably.
  • the protrusion 18 is formed, the depression force is transmitted through the vertical wall of the protrusion 18 directly to the score to act as shearing force.
  • the score is formed by work hardening of the plate or by effecting buckling of the plate, so that it exhibits a considerable brittleness or fragility to shearing force.
  • a score line 21 is formed over the entire or part of the periphery of a protrusion 20 by a conventional technique in which a keen cutting edge is pressed against and driven into the flat plate blank to have a V or U-shaped cross-section.
  • This process may appear simple. However, it is possible to produce by this process an easy-opening container lid which can be opened at a force below 10 Kg which is considered to be the limit exertable by a finger, in case of an aluminum plate which is usually used as the material of beverage cans, if the protrusion is formed to stand up as vertically as possible and if the score is formed as close as possible to the portion from which the protrusion stands up.
  • the score used in the second to seventh examples is one that has been developed by the present inventor for the tear-off opening type container lid. This score can suitably be used in the present invention because it is torn off by a comparatively small shearing force.
  • the second modification is shown in Fig. 10.
  • a ridge 22 of a V or U-shaped cross-section is formed and a score is formed such that the tearing takes place at the lower end 23 of the ridge 22.
  • the container lid in the opened state is shown in Fig. 11.
  • the opening portion 24 is left in the state bent toward the inside of the container lid, i.e. into the container 26. Therefore, it does not come out of the container lid 25, so that the accidental injury of fingers or the like is avoided.
  • the easy-opening container lid of the third modification is provided with a score which is formed by a process as shown in Figs. 12 and 13.
  • an upwardly directed thin-walled continuous projection or shoulder 27 is formed by effecting an extrusion of a portion corresponding to the score.
  • the continuous shoulder 27 is collapsed at its intermediate portion 29 such that the extruded portion 28 again occupies the same plane as the remainder portion of the container lid, thereby to form the score.
  • This modification offers the same advantage as the second modification and, in addition, can be torn at a smaller force than that required in tearing the score of the second modification.
  • the easy-opening container lid of the fourth example has a score which is formed by a process as shown in Figs. 14 and 15.
  • the portion corresponding to the score is formed by an extrusion to form a thin-walled continuous portion 30 which diverges downwardly and, simultaneously, a V or U-cross-sectioned groove 31 in the upper side of the extruded portion near the inside of the continuous portion 30.
  • the extruded portion is pressed to assume the sane plane as the remaining part of the container lid, thereby to bend the continuous portion 30 downwardly and form a V or U-cross-sectioned score groove 33 and also, on the reverse side, a notch 34 which cuts into the plate and toward the score groove 33.
  • This modification offers the same advantage as the third modification.
  • the easy-opening container lid of the fifth modification is an easy-opening container lid formed by a process shown in Figs. 16 and 17.
  • an annular side wall 35 is formed by an extrusion of the portion corresponding to the score.
  • a shallow groove 36 is formed on the reverse side of the container lid at a portion of the latter inside of and close to the side wall 35.
  • the inner portion of the groove 36 is pressed toward the obverse side such that the inner portion is inverted to the obverse side, thereby to form the score.
  • the score of this modification is an improvement of the score of the second modification, and offers the same advantage as the third modification.
  • the easy-opening container lid of sixth modification has a score which is formed by a process shown in Fig. 18.
  • the protrusion 38 is formed by an extrusion performed by a combination of an upper and a lower dies 39, 40.
  • the upper die 39 is provided with a sharp cutting edge 41 having a contour corresponding to the score, so that the score is formed simultaneously with the extrusion of the protrusion 38.
  • the product of this process is substantially identical to that of the first modification.
  • This sixth modification offers advantages that the score and the protrusion are formed simultaneously in one step and that the container lid can be torn with a reduced force because the side wall of the protrusion 38 has been subjected to stretch drawing.
  • the seventh modification has a score which is formed by a process as illustrated in Figs. 19 to 20.
  • a V or U-cross-sectioned groove 42 is formed by a sharp edge of a die, at a portion corresponding to the score to be formed. Then, the opening portion 43 af the inside of the groove 42 is pressed downward by upper and lower dies while spreading the inner peripheral surface of the groove 42.
  • This modification also exhibits the same advantage as the third modification.
  • Another important advantage of the easy-opening container having scores of second to seventh modifications is that the expected function of the score can be achieved not only when aluminum is used as the material but also when the material is iron.
  • the easy-opening container lids have been made of aluminum, even when the container lid is of tear-off opening type, due to a reason concerning the formation of the score. This inconveniently raises the production cost of the can. If the aluminum can lid is used in combination with a can barrel made of iron, it is necessary to completely separate the a lid from the can barrel for the reuse of aluminum and iron. This separation is made only through troublesome work and, therefore, the reuse of aluminum and iron has been practically impossible. This problem, however, is overcome by the present invention which does not exclude the use of iron as the material of the container lid.
  • the invention can be carried out in various forms by adopting various constructions of the portion of container lid around the score, as described hereinunder.
  • the first form is shown in Fig. 21.
  • the periphery 47 of the portion around the score 45 is extruded toward the protrusion 48, so that the portion in which the score 45 is formed constitutes the bottom of a groove 46.
  • the inside diameter of the outer side wall 49 of the groove 46 is so selected as to be smaller than the flank of the finger.
  • the second form is a partial improvement of the first form, and is shown in Fig. 22.
  • the whole or a part of the periphery of an extruded portion 51 around a groove 50 is extruded to have a height greater than the maximum height of the protrusion.
  • a flange portion 55 is formed by folding thin-walled portion around the area of score 54 onto the latter.
  • the torn edge of the remainder portion of the container lid is formed by the bent portion of the thin web, so as to ensure enhanced safety.
  • the invention can be carried out in various forms by adopting various shapes of the protrusion, as described hereinunder.
  • the first form is shown in Fig. 24.
  • the protrusion 57 has an inclined frusto-conical shape and a flattened upper surface 58.
  • the scores of the invention cannot be torn at once even when the protrusion is depressed. Rather, the tearing starts locally and is then propagated to other portions of the score.
  • the depression force exerted on the flat surface 58 on the protrusion 57 is effectively applied to the portion of the score where the angle of side wall 60 of the protrusion 57 to the container lid 59 approximates a right angle, so that the tearing initially takes place at this portion of the score.
  • the tearing is propagated to adjacent portions successively even by a comparatively small depression force. In consequence, the maximum effort or finger force required for the opening operation is reduced. Also, it becomes possible to form a comparatively large opening.
  • Fig. 25 shows a second form.
  • the protrusion has an oval shape.
  • the lid of the protrusion is successively depressed from one end 62 to the other end 63, so that the same advantage as the first form can be obtained. It is also possible to incline the upper face of the protrusion, so as to facilitate depression by the finger for the convenience's sake.
  • Fig. 26 shows a third form.
  • the protrusion 64 is recessed at its lid surface as at 65.
  • This form can apply to all forms and modifications heretofore described, and offers an advantage that the finger is well retained by this recess during the depression.
  • the technique of the invention makes it possible to provide an easy-opening container lid having the following feature.
  • This easy-opening container lid is shown in Figs. 27 and 28.
  • a first score 67 is formed to surround a protrusion 66 wholly or partially, and a second score 68 is formed around the first score 67.
  • the protrusion 66 is depressed to tear the first score and, then, the opening portion 69 is caught and pulled outwardly to cause a tearing along the second score thereby to form a larger opening 70.
  • This arrangement is quite advantageous in that, although the first opening is small, it is possible to form a much larger second opening.
  • the container lid is provided with two openings 71 and 72.
  • both opening portions 71, 72 are torn and opened.
  • One of the openings is used as the outlet of the content, while the other is used for air inlet port.
  • This container lid can be used most suitably for containers of beverages, oils and so forth.
  • the invention has a wide industrial applicability, because the container lid of the invention finds wide use such as container lids of containers intended for containing beverages, oils and powdered or granular materials which are now widely utilized.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
  • Cartons (AREA)
  • Containers Opened By Tearing Frangible Portions (AREA)

Abstract

Amelioration se rapportant a un conteneur specialement construit pour etre ouvert facilement par poussee-arrachage de son couvercle. Une partie convexe est formee dans un organe en feuille fine par une operation d'etirage profond. Des lignes de faiblesse sont formees pour faciliter l'ouverture du conteneur en formant une ouverture de versement, les lignes de faiblesse etant partiellement ou entierement disposees autour et a proximite de la peripherie de la partie convexe.
EP19790900187 1979-01-29 1980-08-22 Couvercle facile a ouvrir pour conteneur. Withdrawn EP0024093A4 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19790900187 EP0024093A4 (fr) 1979-01-29 1980-08-22 Couvercle facile a ouvrir pour conteneur.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/JP1979/000021 WO1980001558A1 (fr) 1979-01-29 1979-01-29 Couvercle facile a ouvrir pour conteneur
EP19790900187 EP0024093A4 (fr) 1979-01-29 1980-08-22 Couvercle facile a ouvrir pour conteneur.

Publications (2)

Publication Number Publication Date
EP0024093A1 true EP0024093A1 (fr) 1981-02-25
EP0024093A4 EP0024093A4 (fr) 1981-09-01

Family

ID=26078581

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19790900187 Withdrawn EP0024093A4 (fr) 1979-01-29 1980-08-22 Couvercle facile a ouvrir pour conteneur.

Country Status (1)

Country Link
EP (1) EP0024093A4 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0160626A3 (fr) * 1984-05-03 1987-10-14 ITALCAPS S.p.A. Fermeture de garantie, en particulier pour flacons pharmaceutiques
EP0260084B1 (fr) * 1986-09-08 1992-12-30 Asia Can Company Limited Récipient métallique et procédé pour sa fabrication
EP0599549A1 (fr) * 1992-11-23 1994-06-01 CarnaudMetalbox plc Fermeture pour récipient
US6401956B1 (en) 1999-09-21 2002-06-11 Crown Cork & Seal Technologies Corporation Safety container end having improved opening characteristics
RU2232114C2 (ru) * 2002-03-19 2004-07-10 Лисовский Юрий Николаевич Узел крепления петельки к крышке металлической консервной банки

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8001558A1 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0160626A3 (fr) * 1984-05-03 1987-10-14 ITALCAPS S.p.A. Fermeture de garantie, en particulier pour flacons pharmaceutiques
EP0260084B1 (fr) * 1986-09-08 1992-12-30 Asia Can Company Limited Récipient métallique et procédé pour sa fabrication
EP0599549A1 (fr) * 1992-11-23 1994-06-01 CarnaudMetalbox plc Fermeture pour récipient
US6401956B1 (en) 1999-09-21 2002-06-11 Crown Cork & Seal Technologies Corporation Safety container end having improved opening characteristics
US6685417B2 (en) 1999-09-21 2004-02-03 Crown Cork & Seal Technologies Corporation Safety container end having improved opening characteristics
RU2232114C2 (ru) * 2002-03-19 2004-07-10 Лисовский Юрий Николаевич Узел крепления петельки к крышке металлической консервной банки

Also Published As

Publication number Publication date
EP0024093A4 (fr) 1981-09-01

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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17P Request for examination filed

Effective date: 19800816

AK Designated contracting states

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STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19830525