US3416700A - Safety device for easy opening container ends - Google Patents

Safety device for easy opening container ends Download PDF

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Publication number
US3416700A
US3416700A US678087A US67808767A US3416700A US 3416700 A US3416700 A US 3416700A US 678087 A US678087 A US 678087A US 67808767 A US67808767 A US 67808767A US 3416700 A US3416700 A US 3416700A
Authority
US
United States
Prior art keywords
score line
score
pull tab
easy opening
container
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
US678087A
Other languages
English (en)
Inventor
John C Jasper
Albert J Holk
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.)
Continental Can Co Inc
Original Assignee
Continental Can Co Inc
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 Continental Can Co Inc filed Critical Continental Can Co Inc
Priority to US678087A priority Critical patent/US3416700A/en
Priority to DE19681757471 priority patent/DE1757471B2/de
Priority to AT483668A priority patent/AT283192B/de
Priority to ES1968139680U priority patent/ES139680Y/es
Priority to GB1229286D priority patent/GB1229286A/en
Priority to BR203419/68A priority patent/BR6803419D0/pt
Priority to FR1588065D priority patent/FR1588065A/fr
Application granted granted Critical
Publication of US3416700A publication Critical patent/US3416700A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B65D17/4011—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 for opening completely by means of a tearing tab
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B65D17/42—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions with cutting, punching, or cutter accommodating means

Definitions

  • This disclosure relates to easy opening container ends of the type having a removable panel portion defined by a score line.
  • the purpose of the invention is to prevent the sudden catastrophic implosion or explosion of container ends while being opened and subjected to varying degrees of pressure or vacuum. This failure is prevented by limiting the crack propagation along the score line to an area large enough to allow a gradual pressure equalization of the container and specifically includes two areas of different score residuals.
  • This invention relates to easy opening container ends which are particularly intended for use as an end of a sealed container having an internal pressure other than atmospheric, and wherein each easy opening container end has a removable panel portion defined by a peripheral weakened line, such as a score line.
  • a tab which is suitably secured thereto in a manner so as to be capable of exerting a concentrated pressure on the container end along a predetermined portion of the score line.
  • the uncontrolled rupture of the container end along the score line is prevented by limiting the crack propagation to an area large enough to allow a gradual pressure equalization of the container.
  • the invention proposes two areas of different score residuals. The larger score residual area is placed such that it in no way interferes with the initial opening of the container, but prevents the crack along the score line from propagating any further. The portion of the container end thus opened is large enough to allow gradual pressure equalization and thereby prevents the undesired failure. It is to be understood, of course, that the scoring will be of a depth throughout wherein only a nominal force will be required to both initiate and complete the rupture of the container end so as to facilitate the removal of the removable portion.
  • the scoring tool may be notched.
  • the supporting anvil for the container end may be notched whereby the container end may deflect temporarily into the notches in the anvil so as to reduce the effect of the scoring tool thereon.
  • a further feature of this invention is the recessing of a central portion of the container end underlying the terminal end of the pull tab, and the provision of the recessed central portion with upstanding buttons supporting the pull tab on opposite sides of the terminal end so as to facilitate the initial engagement and lifting of the pull tab.
  • FIGURE 1 is a fragmentary top perspective view of a can formed in accordance with this invention.
  • FIGURE 2 is an enlarged fragmentary plan view of the can end of FIGURE 1.
  • FIGURE 3 is an enlarged fragmentary vertical sectional view taken along the score line along line 33 of FIGURE 2 and shows the differential score residual.
  • FIGURE 4 is an enlraged fragmentary vertical 'sectional view taken along the line 44 of FIGURE 2.
  • FIGURE 5 is an enlarged fragmentary vertical sectional view taken along the line 5-5 of FIGURE 2.
  • FIGURE 6 is an enlarged fragmentary plan view showing the outline of the score along different portions thereof in the area indicated in FIGURE 2.
  • FIGURE 7 is a schematic sectional view taken through an anvil and a scoring die prior to the formation of a score line in a container end.
  • FIGURE 8 is an enlarged fragmentary plan view of another container end showing a slightly modified form of scoring.
  • FIGURE 9 is an enlarged fragmentary plan view along the score line of the container end of FIGURE 8 in the area indicated thereon and shows the specific score line configuration.
  • FIGURE 10 is an enlarged fragmentary schematic vertical sectional view showing generally the anvil and die arrangement for forming the score of FIGURES 8 and 9.
  • FIGURE 1 a can which is formed in accordance with this invention and which is generally referred to by the numeral 15.
  • the can 15 includes a conventional can body 16 of which only the upper portion is illustrated.
  • the body 16 has secured thereto by means of a conventional double seam 17 an easy opening can end which is formed in accordance with this invention and which is generally referred to by the numeral 18.
  • the can end 18 includes an end panel 19 which is surrounded by an upstanding chuck wall 20, the chuck wall 20 forming a part of the double seam 17.
  • the end panel 19 is provided adjacent its inner section with a chuck wall 20 with a continuous peripheral score line which is generally referred to by the numeral 21 and which defines a removable panel portion 22.
  • a pull tab 23 which is secured in place by means of a rivet 24 which is preferably integrally formed from the removable panel portion 22.
  • the removable panel portion 22 is provided with an anti-fracture score line 25 which is equally spaced from the score line 21 and positioned radially inwardly thereof.
  • the anti-fracture score line 25 permits the flexing of the end panel 19 and the absorption of stresses which would be normally imparted to the score line 21.
  • the end panel 19 is also provided with a recessed central portion 26 which underlies the inner terminal end of the pull tab 23.
  • a pair of buttons 27 projects upwardly from the recessed portion 26 and supports the inner part of the pull tab 23 on opposite sides of the inner terminal end.
  • the above-described can 15 and the easy opening can end 18 thereof has proven to be quite satisfactory when the internal pressure within the can is substantially the same as that as the surrounding atmosphere.
  • the can 15 contains a product which is vacuum packed or one which is packed under very high pressures, such as beer and soft drinks, difliculties frequently arise during the opening of such cans.
  • the can 15 is vacuum packed, at the time the pull tab is applying an axially inwardly directed force on the removable portion 22, the pressure differential between the interior and exterior of the can 15 results in a pressure force being applied on the removable panel portion.
  • the force required to open the container must remain as low as possible. Furthermore, the force required to tear out the removable panel portion 22 must remain consistently low. At the same time, uncontrolled rupture of the end panel along the score line due to either implosion or explosion must be prevented. In accordance with this invention, this is accomplished by varying the score residual.
  • the score line 21 includes a score line portion 28 which is aligned with the nose of the pull tab 23 and along which initial rupture of the end panel 19 is intended to occur.
  • the scoring along the score line portion 28 is relatively deep with there being a relatively small score residual 29 which must be ruptured during the initiation of the opening of the can 15.
  • the length of the score line portion 28 is sufficient to provide for the movement of the adjacent part of the removable panel portion 22 out of the plane of the end panel 19 whereby free flow of gases through the end panel 19 may occur and the pressure within the can 15 equalized with the surrounding atmospheric pressure.
  • Propagation of the crack along the score line 21 is prevented by the provision of score line portions 30 on opposite sides of the score line portion 28, which score line portions 30 are of a lesser depth than the score line portion 28 and provide greater score residuals 31.
  • the score residuals 31 will be sufiicient to prevent the uncontrolled propagation of the crack along the score line 21 while at the same time will not be sufiiciently great so as to prevent the rupture thereof utilizing the pull tab 23.
  • the score line 21 is of substantially the same depth as the score line portion 28 and there remains substantially the same score residual as the score residual 29.
  • the score line 21 is of a constant width at the surface of the end panel 19.
  • the base of the score line portion 30 is wider than the base of the score line portion 28. This is due to the particular configuration of the tools utilized in forming the score line 21.
  • FIGURE 7 it will be seen that during the scoring of the end panel 19, the end panel 19 is firmly seated on an anvil 33 and is engaged by a scoring die 34 having a downwardly projecting scoring rib 35.
  • the rib 35 is notched as at 36 so as to form the lesser depth score line portions 30.
  • FIGURES 8 and 9 wherein there is illustrated a slightly different score line configuration.
  • the continuous score line along which rupture occurs during the opening of the can 15 is identified by the numeral 40 while the anti-fracture score line is identified by the numeral 41.
  • the score line 40 has a portion 42 which will be aligned with the pull tab 23 and along which initial fracture or rupture of the end panel 19 will occur.
  • the score line 40 is provided with score line portions 43 of lesser depth and greater score residual on opposite sides of the score line portion 42.
  • a section along the score line 40 will correspond to a similar section along the score line 41 and will appear like that illustrated in FIGURE 3.
  • the score line portion 42 is of a greater width at the surface of the end panel 19 than are the score line portions 43.
  • the width of the score line portion 42 at its base is the same as that of the score line portion 43 at its base.
  • This tooling includes an anvil 44 which underlies and supports the end panel 19.
  • the scoring is performed by means of a scoring die 45 having a depending score forming rib 46.
  • the rib 46 unlike the rib 35, is of a constant depth.
  • the anvil 44 is notched or recessed as at 47.
  • the notches 47 are in alignment with the lesser depth score line portions 43. While the scoring tool 45 engages the end panel 19, those portions of the end panel 19 overlying the notches 47 downwardly depress under the pressure of the scoring rib 46 and as a result the score line portions 43 of lesser depth are formed.
  • score lines 21 and 40 have their individual advantages and disadvantages.
  • resultant score lines 21 and 40 have equivalent functions, each serving to prevent uncontrolled implosion or explosion due to differential pressure forces exerted on the removable panel portion 22.
  • An easy opening can end particularly intended for use as an end of a sealed can having an internal pressure other than atmospheric, said can end comprising an end panel having a removable panel portion defined by a continuous score line, a pull tab secured to said removable panel portion and being reactable on said end panel to stress said end panel along a predetermined portion of said score line in the direction of the application of force on said end panel due to the pressure differential, said end panel being resistant to uncontrolled movement of said removable panel after initial rupture due to the differential pressure with said score line being of a lesser depth than said predetermined portion on opposite sides of said predetermined portion.
  • the easy opening can end of claim 1 wherein said can end is particularly intended for use as an end of a can having a pressure therein below atmospheric pressure and said pull tab, when actuated exerts an inwardly directed force on said removable panel portion.
  • said removable panel portion has an anti-fracture score adjacent to said continuous score line for facilitating flexing of said removable panel portion when stressed and for preventing undue stressing of said end panel along said continuous score line, said anti-fracture score being reduced in depth in alingnment with said lesser depth score line portions.
  • the easy opening can end of claim 1 wherein said can end forms one end of a can including a body and wherein said can end has a peripheral attaching portion seamed to said body in sealed relation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
  • Containers Opened By Tearing Frangible Portions (AREA)
US678087A 1967-10-25 1967-10-25 Safety device for easy opening container ends Expired - Lifetime US3416700A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US678087A US3416700A (en) 1967-10-25 1967-10-25 Safety device for easy opening container ends
DE19681757471 DE1757471B2 (de) 1967-10-25 1968-05-14 Vollaufreissdeckel aus blech fuer leicht zu oeffnende dosen
AT483668A AT283192B (de) 1967-10-25 1968-05-20 Deckel für leicht zu öffnende Behälter
ES1968139680U ES139680Y (es) 1967-10-25 1968-06-19 Dispositivo de seguridad para tapas de envases de facil a- pertura.
GB1229286D GB1229286A (de) 1967-10-25 1968-07-22
BR203419/68A BR6803419D0 (pt) 1967-10-25 1968-10-24 Tampo de lata de facil abertura
FR1588065D FR1588065A (de) 1967-10-25 1968-10-25

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US678087A US3416700A (en) 1967-10-25 1967-10-25 Safety device for easy opening container ends

Publications (1)

Publication Number Publication Date
US3416700A true US3416700A (en) 1968-12-17

Family

ID=24721332

Family Applications (1)

Application Number Title Priority Date Filing Date
US678087A Expired - Lifetime US3416700A (en) 1967-10-25 1967-10-25 Safety device for easy opening container ends

Country Status (7)

Country Link
US (1) US3416700A (de)
AT (1) AT283192B (de)
BR (1) BR6803419D0 (de)
DE (1) DE1757471B2 (de)
ES (1) ES139680Y (de)
FR (1) FR1588065A (de)
GB (1) GB1229286A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3604589A (en) * 1969-06-27 1971-09-14 Ermal C Fraze Antifracture coin for panelled can ends
US20050082291A1 (en) * 2001-11-06 2005-04-21 Ad Emmerzaal Easy opening closure, container provided with such closure, and apparatus for producing such closure
RU2340522C2 (ru) * 2003-01-13 2008-12-10 Болл Пэкэджинг Юроп Гмбх Способ фиксации положения захватного язычка посредством формования выступа
US20100108679A1 (en) * 2007-02-14 2010-05-06 Impress Group B.V. Can, and a Body and Panel Therefor
US8371467B2 (en) 2002-06-11 2013-02-12 Crown Packaging Technology, Inc. Easily openable can lid having a movable portion
US20170137168A1 (en) * 2014-06-30 2017-05-18 Ardagh Mp West France Metal cover for a container body

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3339789A (en) * 1965-06-14 1967-09-05 Stolle Corp Scored metal can
US3366270A (en) * 1966-05-27 1968-01-30 Continental Can Co Pull tab for easy opening can end

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3339789A (en) * 1965-06-14 1967-09-05 Stolle Corp Scored metal can
US3366270A (en) * 1966-05-27 1968-01-30 Continental Can Co Pull tab for easy opening can end

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3604589A (en) * 1969-06-27 1971-09-14 Ermal C Fraze Antifracture coin for panelled can ends
US20050082291A1 (en) * 2001-11-06 2005-04-21 Ad Emmerzaal Easy opening closure, container provided with such closure, and apparatus for producing such closure
US8371467B2 (en) 2002-06-11 2013-02-12 Crown Packaging Technology, Inc. Easily openable can lid having a movable portion
US8733576B2 (en) 2002-06-11 2014-05-27 Crown Packaging Technology, Inc. Easily openable can lid having a movable portion for pull tab access
RU2340522C2 (ru) * 2003-01-13 2008-12-10 Болл Пэкэджинг Юроп Гмбх Способ фиксации положения захватного язычка посредством формования выступа
US20100108679A1 (en) * 2007-02-14 2010-05-06 Impress Group B.V. Can, and a Body and Panel Therefor
US20170137168A1 (en) * 2014-06-30 2017-05-18 Ardagh Mp West France Metal cover for a container body
JP2017520490A (ja) * 2014-06-30 2017-07-27 アルダフ エムピー ウエスト フランス 容器本体用の金属蓋

Also Published As

Publication number Publication date
ES139680Y (es) 1969-07-01
DE1757471B2 (de) 1976-07-22
GB1229286A (de) 1971-04-21
DE1757471A1 (de) 1971-04-22
AT283192B (de) 1970-07-27
ES139680U (es) 1968-12-01
BR6803419D0 (pt) 1973-05-03
FR1588065A (de) 1970-04-03

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