US3874555A - End panel for containers - Google Patents

End panel for containers Download PDF

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Publication number
US3874555A
US3874555A US455525A US45552574A US3874555A US 3874555 A US3874555 A US 3874555A US 455525 A US455525 A US 455525A US 45552574 A US45552574 A US 45552574A US 3874555 A US3874555 A US 3874555A
Authority
US
United States
Prior art keywords
tear strip
panel
residual
area
tear
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
US455525A
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English (en)
Inventor
Leon M Patarini
Joseph A Bronec
Arthur P Zundel
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.)
Rexam Beverage Can Co
Original Assignee
National Can Corp
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 National Can Corp filed Critical National Can Corp
Priority to US455525A priority Critical patent/US3874555A/en
Priority to CA219,746A priority patent/CA1022093A/en
Priority to AU78445/75A priority patent/AU492504B2/en
Priority to DE19752511245 priority patent/DE2511245A1/de
Priority to JP50035275A priority patent/JPS50130589A/ja
Priority to GB1267475A priority patent/GB1473275A/en
Application granted granted Critical
Publication of US3874555A publication Critical patent/US3874555A/en
Assigned to AMERICAN NATIONAL CAN CORPORATION, A CORP OF DE. reassignment AMERICAN NATIONAL CAN CORPORATION, A CORP OF DE. MERGER (SEE DOCUMENT FOR DETAILS). DELAWARE EFFECTIVE 4/30/87 Assignors: AMERICAN CAN PACKAGING INC., A CORP. OF DE., NATIONAL CAN CORPORATION, TRAFALGAR INDUSTRIES INC., (INTO)
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
    • B65D17/4012—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 partially by means of a tearing tab

Definitions

  • the end panel has a tear strip defined by a weakened area of material, which has a leading end adjacent the periphery of the panel and a base end permanently attached to the main body of the panel.
  • the area of weakened material produces a minimum residual along a portion of the leading end and the residual increases in thickness from the leading end to a maximum thickness at the base end.
  • the configuration of the elongated tear strip is generally U-shaped and has a maximum transverse dimension along the leading edge and progressively reduces in transverse dimension from the leading edge down to an intermediate portion.
  • the tear strip also has an integral rivet formed adjacent the leading end and the rivet has a further surrounding weakened area which has its radius located on the center of the rivet and circumscribes an arc of more than l80 about the periphery of the rivet.
  • the end panel has a tear strip which is generally U-shapcd in plan view and has a leading or tear initiating end adjacent the periph cry of the main body of the panel.
  • the opposite or base end of the tear strip is permanently attached to the main body of the end panel.
  • An elongated tab is permanently attached by a rivet to the elongated tear strip adjacent the tear initiating end.
  • the tear strip and tab are designed so that initial pivotal movement ofthe free end ofthe tab away from the end panel will sever the leading edge of the tear strip and the tear strip will bend along a line that ex tends generally transversely of the tear strip through the center of the rivet. This will place the leading end or tear initiating end of the tab as well as the nose end of the tab inside the container to which the end panel is attached.
  • the tab is then pushed from the handle end into the container and. during this movement. the remainder of the weakened area defining the tear strip is severed while the tab is guided along a predetermined path by having opposite edges in engagement with severed edges of the main panel.
  • a pair of reeesses on the tab are aligned with the severed edges defined in the main body so that the lower edges of these recesses define abutments which engage the lower or inside surface ofthe panel to guide the tab to a final position wherein the handle end is located adjacent the base end of the tear strip and all of the tear strip as well as substantially all of the tab is located inside the container.
  • the tab can readily be removed from the tear strip by bending the tear strip along the initial bend line produced during initial rupture of the weakened area or the entire tab and tear strip can be removed by bending along the base line defining the connection between the tear strip and the panel.
  • the weakened area. producing a residual that defines the tear strip in a container end panel is designed to insure that the end panel will not bulge. buckle or rupture when the container to which it is attached is internally pressurized to a pressure of at least 90 psi.
  • the residual is so designed that a minimum force is required for ini tially severing the first portion of the residual.
  • the end panel has a weakened area of material that is generally U-shaped in plan view and produces a residual. defined by the weakened line. between the tear strip and the remainder of the panel.
  • the elongated generally U-shaped tear strip is permanently connected to the remainder of the panel generally adjacent the center of the panel and has an enlarged portion adjacent the periphery thereof.
  • the residual has a minimum thickness along a small portion of the transversely extending leading end of the tear strip and a second area of thickness on opposite sides of the minimum area which is substantially greater than the thickness of the area of minimum thickness. The residual then has a progressively increasing thickness from the second area down to the base end of the tear strip.
  • the thickness of the residual at the selected locations described above will provide sufficient rigidity to the entire end to prevent bulging of the end. buckling of the end or rupturing when internal pressure is applied to the container to which it is attached.
  • the tear strip also has a permanent connection for a tab and the permanent connection is in the form of a rivet that is deformed from the main body of the panel.
  • the tear strip has a further weakened line which surrounds the substantially circular rivet or connecting means and the center of the arcuate weakened line is concentric with the center of the rivet and circumseribes an arc of more than I to prevent severance of the area between the adjacent weakened area during the opening process.
  • the generally U-shaped elongated tear strip also has a maximum transverse dimension adjacent the leading end or edge which is greater than the transverse dimen sion of the tear strip along the rivet or connecting means to prevent removal of the tear strip after initial rupture thereof.
  • FIG. I is a fragmentary plan view of the easy open end panel
  • FIG. 2 is a perspective view of the end panel shown in FIG. 1 and attached to a container body.
  • FIG. 3 is a view similar to FIG. 2 after the tear strip in the panel has been initially ruptured
  • FIG. 4 is a transverse sectional view as viewed along line 44 of FIG. 3;
  • FIG. 5 is a fragmentary bottom perspective view of the end panel shown in FIG. 3'.
  • FIG. 6 is a perspective view showing the tear strip and tab in its finally opened position
  • FIG. '7 is a bottom end view of the end panel before the weakened line has been ruptured
  • FIG. 8 is an enlarged fragmentary sectional view as viewed along line 8-8 of FIG. 7;
  • FIG. 9 is a sectional view. as viewed along line 9-9 of FIG. 7'.
  • FIG. 10 is an enlarged sectional view as viewed along line l0l0 of FIG. 7.
  • FIG. 1 of the drawings shows an easy open end panel. generally designated by reference numeral 10, having a peripheral seam I2, which is attached by the usual double seaming process to container body 14.
  • the container body and end panel are preferably made of metal. such as aluminum or steel.
  • End panel 10 consists of a main panel 16 that has a weakened area of material IS defined therein to produce a substantially U-shaped elongated strip 20 which may be severed therefrom.
  • Tear strip 20 has a leading end or nose portion 22 and a base end 24.
  • the weakened area of material 18 terminates at spaced points in the container main panel 16 so that the base end 24 of the tear strip is permanently connected to end panel I6 as will be described later.
  • Tear strip 20 also has an integral rivet or connecting means 26 for permanently connecting an opening tab 30 thereto.
  • Connecting means 26 consists of a circular rivet which is deformed from the main body of tear strip 20 adjacent leading end 22.
  • Connecting means or rivet 26 extends through an opening in the tab and has an enlarged portion 32 overlying the upper surface of tab 30 to prevent removal of tab 30 from the tear strip.
  • Opening tab 30 has a leading end or nose portion 34, the forward edge of which is coincident with the weakened area of material 18 along the center of leading edge 22 and tab 30 has a handle portion 36 adjacent the opposite end thereof.
  • Tab 30 further has a pair of recesses 38 adjacent handle 36 and the bases of the recesses have a spacing which is slightly less than the transverse dimension of weakened line portion 18 adjacent base end 24 of tear strip 20.
  • Tear strip 30 also has a further weakened area 40 that is located adjacent rivet 26 on the side opposite leading end 22. The purpose of this weakened area 40 will be described later.
  • the weakened area of material I8 is severed by initially turning the handle end 36 of tab 30 counterclockwise or away from the upper surface of main panel I6. This will rupture weakened line 18 along leading end 22 and at the same time sever weakened area 40 so that the tear strip and tab will assume a position generally shown in FIGS. 3. 4 and 5. A down ward movement or pushing force on handle end 36 of tab 30 will then sever the remainder of weakened line I8 to ultimately locate recesses 38 in alignment with the severed edges produced on main panel 16 by sever ing of the weakened line.
  • the handle portion 36 of tab 30 is then moved generally parallel to the upper surface of main panel 16 and the recesses 38 receive opposite edges of opening 59 (FIG. 6). defined by severing weakened line 18. with side walls 42 of recesses 38 defining abutments for engaging the lower surface of main panel 16 to prevent the tab from moving upwardly out of the opening defined by tear strip 20.
  • the end panel does not have sufficient strength to withstand the pressures developed internally of the container during packaging and shipment of products.
  • the pressures developed internally of the container may reach psi while the filled containers are being shipped and/or stored during warm summer temperatures.
  • the end panel may buckle due to the large internal pressures that are developed within the container. This will result in what is known as rockers which means that the tab and/or a portion of the main panel 16 extend beyond the peripheral edge of the rim defined by seam 12 so that the container will not be flat adjacent one end.
  • the pressure within the container may be sufficient to cause blow out" which is a condition where a portion of the end panel is severed because of the internal pressures and the entire scored area and tab is severed from the remainder of the container.
  • the weakened area of material defining the tear strip is designed so as to be capable of withstanding increased pressure and still have the panel formed of metal. such as aluminum. having minimum thickness. This is accomplished without increasing the forces required for severing the score line. when desired.
  • the residual in the weakened area of material has a minimum thickness along a portion of the leading end of tear strip 20 and then is stepped to a substantially greater thickness along a second area thereof which terminates substantially along a plane that extends transversely of the tear strip through the center of the connecting means.
  • the remainder of the residual. defined by weakened line 18, is then progressively increased in steps from adjacent the center of connecting means 26 to the base end of tear strip 20.
  • Residual R defined by weakened area of material l8 has a first thickness X or minimum thickness along a small portion of the weakened line on opposite sides of the center line CL of longitudinal tear strip 20.
  • the elongated dimension L of the residual area of minimum thickness X is substantially less than the transverse dimension of the leading end 22 of tear strip 20.
  • the elongated dimension is less than 0.25 inches and is on the order of 20 percent of the transverse dimension of leading edge 22.
  • Residual R then has second portions L located on opposite sides of first portion L. and the second portions have thicknesses Y that are substantially greater than the thickness X of residual R adjacent the leading edge of tear strip 20.
  • the elongated dimension ofeach portion L of intermediate thickness Y of residual R extends from one end of the portion of minimum thickness L to a plane P running transversely through the center line of connecting means 26.
  • the remainder of residual R identified by reference numeral Z, has an elongated dimension L which extend from plane P to base end 24 of the container tear strip.
  • the thickness of residual R progressively increases in steps from plane P to a maximum thickness adjacent base end 24 of tear strip 20.
  • the residual has a first segment L that extends in opposite directions from center line CL along leading end 22 of tear strip 20 and this residual is of minimum thickness.
  • Residual R then has second segments L, which have a thickness substantially greater than the thickness of residual X or first segment L and segments L, terminate adjacent a plane that extends perpendicular to the longitudinal center line CL through the center of connecting means 26.
  • Residual R also has third segments L, which extend from plane P to the base end of tear strip 20 and these segments have a residual of progressively increasing thicknesses from plane P to base end 24.
  • weakened area material 18 While not specifically limited to actual dimensions. the specific dimensions for weakened area material 18 will be described in connection with a container end panel 10 made from gauge [9 aluminum which has a metal thickness on the order of 0.0!35 inches.
  • the thickness X of residual R along first segment L would be on the order of0.002 to 0.003 inches.
  • the thickness Y of residual R along second segments L will be in the range of0.003 to 0.004 inches.
  • Third segments L have a residual of progressively increasing thickness in steps and terminate at the base end 24 with a thickness in the range of 0.004 to 0.006 inches.
  • the residual thickness X were 0.002 inches. and the length of segment L could be about 0.100 inches.
  • the residual thickness Y in segments L could be 0.0035 inches while the residual in segments L would increase in increments and have a thickness adjacent base end 24 of 0.004 inches.
  • the container end panel is capable of withstanding internal pressures greater than 90 psi. without having the end panel buckle or having the weakened area severed, resulting in blowout.”
  • the initial rupture of the weakened area can be accomplished with minimum force being applied in a counterclockwise direction to handle end tab 36. Once this initial rupture has been accomplished. the remaining portions of residual R can readily be severed with a minimum amount of force.
  • arcuate score 40 is specifically configured to insure that any further tearing beyond the opposite end of arcuate score 40 will occur at location that will prevent separating of the tab from tear strip 20.
  • arcuate area 40 of reduced cross section has its center located concentrically with the center of connecting means 26 and cir cumscribes an arc of more than This means that should the tear strip be fractured beyond opposite ends of arcuate area 40 of reduced cross section. this severing will occur along a plane extending towards leading end 22 of container tear strip 20 to insure that the tear strip will not be severed generally along plane P and ultimately result in the tab being removed from the remainder of the tear strip.
  • the nose portion or leading end of the tear strip can readily be pulled to a position above the main panel 16 and the remainder of weak ened area severed during this manipulation so that it is then impossible to properly position the tear strip and tab as originally intended.
  • the tear strip is specifically configured so as to substantially eliminate the possibility of forcing the tear strip to a position above main body 16 after it has been initially ruplured.
  • the leading end or tear initiating end 22 of tear strip 20 has a first transverse dimension identified by the reference nu meral B (FlG. 4) which is substantially greater than the transverse dimension, identified by reference numeral A. along plane P extending through the center line of connecting means 26. More specifically. the tear strip has a major transverse dimension adjacent the tear initiating end or nose portion 22 and is constantly reduced in transverse dimension along a taper which extends well beyond plane P and which ultimately merges with a base area of constant transverse dimension adjacent base end 24 of tear strip 20.
  • the present invention provides a simple expedient for greatly increasing the amount of pressure that can be developed internally of the container without buckle, rupture or bulging. Furthermore, all of this is accomplished with metal of minimum thickness that maintains the cost of the end panel at a competitive price with respect to other containers.
  • the tear strip is designed to substantially eliminate the possibility of having the tear strip pulled from the container end panel during the severing of the weakened line.
  • An easy open end panel having a weakened area defining a generally U-shaped. elongated tear strip in said end panel, said tear strip having a leading end and an opposite base end, said leading end being located adjacent the periphery of said end panel and said base end defining a permanent connection between said tear strip and said end panel.
  • said weakened area producing a residual between said tear strip and said end panel, said residual having an area of minimum thickness on at least a portion of said leading end and an area of maximum thickness adjacent said base, said residual having an increasing thickness between said residual area of minimum thickness and said residual area of maximum thickness.
  • An easy open end panel as defined in claim 3 in which said tear strip has an arcuate weakened line surrounding said substantially circular connecting means. said arcuate weakened line having its center concentric with the center of said connection portion and circumscribing an arc of more than 8.
  • An easy open end panel consisting of a generally circular main panel having a peripheral edge; a weakened area within said main panel defining an elongated tear strip extending generally radially from the periph cry of said main panel.
  • said elongated tear strip having a tear initiating end adjacent the periphery of said main panel and a base end located a substantial distance from the periphery of said main panel. and connecting means in said tear strip adjacent said tear initiating end for connecting a tab thereto, said connecting means being generally circular.
  • said weakened area having a transverse dimension at said tear initiating end which is greater than the transverse dimension along a plane extending transversely of said tear strip through the center of said connecting means so that pivotal movement of a tab connected to said connecting means in a direction away from a main body of said main panel will rupture said weakened end along said tear initiating end and prevent movement of said tear initiating end to the opposite side of said panel.
  • said generally circular connecting means has a generally arcuate area of reduced cross-section in said tear strip surrounding said connecting means, said arcuate area circumscribing an arc of greater than 180 and having its center concentric with said connecting means.
  • said tear strip has a major transverse dimension adjacent said tear initiating end and has a constantly reducing taper, in plane view, from said tear initiating end toward said base end, said tear strip having a constant transverse dimension from said base end toward said connecting means and merging with said reducing taper between said connecting means and said base end.
  • said weakened area defines a residual between said tear strip and said main panel, said residual having (1) a first segment of minimum thickness along a portion of said tear initiating end (2) second segments on opposite ends of said first segment, said second segments having a thickness substantially greater than said first segment. and (3) third segments between said second segments and said base end, said third segments each having a progressively increasing thickness from said second segments to said base end.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers Opened By Tearing Frangible Portions (AREA)
US455525A 1974-03-28 1974-03-28 End panel for containers Expired - Lifetime US3874555A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US455525A US3874555A (en) 1974-03-28 1974-03-28 End panel for containers
CA219,746A CA1022093A (en) 1974-03-28 1975-02-10 End panel for containers
AU78445/75A AU492504B2 (en) 1975-02-21 End panel for containers
DE19752511245 DE2511245A1 (de) 1974-03-28 1975-03-13 Behaelter mit aufreissverschluss
JP50035275A JPS50130589A (enrdf_load_stackoverflow) 1974-03-28 1975-03-24
GB1267475A GB1473275A (en) 1974-03-28 1975-03-26 Easy-open end panels for containers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US455525A US3874555A (en) 1974-03-28 1974-03-28 End panel for containers

Publications (1)

Publication Number Publication Date
US3874555A true US3874555A (en) 1975-04-01

Family

ID=23809164

Family Applications (1)

Application Number Title Priority Date Filing Date
US455525A Expired - Lifetime US3874555A (en) 1974-03-28 1974-03-28 End panel for containers

Country Status (5)

Country Link
US (1) US3874555A (enrdf_load_stackoverflow)
JP (1) JPS50130589A (enrdf_load_stackoverflow)
CA (1) CA1022093A (enrdf_load_stackoverflow)
DE (1) DE2511245A1 (enrdf_load_stackoverflow)
GB (1) GB1473275A (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023703A (en) * 1975-05-27 1977-05-17 Strobe Carl J Easy-open container with flange push-in member
FR2393733A1 (fr) * 1977-06-06 1979-01-05 Stolle Corp Couvercle de boite a ouverture facile
EP0050713A1 (en) * 1980-10-24 1982-05-05 The Continental Group, Inc. Easy opening end unit with tapered score
USD305305S (en) 1986-06-26 1990-01-02 Mg Group Plc Can closure
USD305990S (en) 1985-09-20 1990-02-13 Cmb Packaging (Uk) Limited Container closure
US4915290A (en) * 1989-02-27 1990-04-10 Combibloc, Inc. Package closure
KR100712313B1 (ko) 2007-02-28 2007-05-02 조현진 개봉성 및 음용성이 향상된 캔 뚜껑
US20150353229A1 (en) * 2012-05-25 2015-12-10 Boston Beer Corporation Beverage delivery can

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3717279A (en) * 1972-01-27 1973-02-20 Nat Can Corp Nondetachable tear strip with wing tab
US3738526A (en) * 1972-01-27 1973-06-12 Nat Can Corp Container with permanently attached tear strip and tab

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4021982Y1 (enrdf_load_stackoverflow) * 1964-12-17 1965-07-28

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3717279A (en) * 1972-01-27 1973-02-20 Nat Can Corp Nondetachable tear strip with wing tab
US3738526A (en) * 1972-01-27 1973-06-12 Nat Can Corp Container with permanently attached tear strip and tab

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023703A (en) * 1975-05-27 1977-05-17 Strobe Carl J Easy-open container with flange push-in member
FR2393733A1 (fr) * 1977-06-06 1979-01-05 Stolle Corp Couvercle de boite a ouverture facile
EP0050713A1 (en) * 1980-10-24 1982-05-05 The Continental Group, Inc. Easy opening end unit with tapered score
USD305990S (en) 1985-09-20 1990-02-13 Cmb Packaging (Uk) Limited Container closure
USD305305S (en) 1986-06-26 1990-01-02 Mg Group Plc Can closure
US4915290A (en) * 1989-02-27 1990-04-10 Combibloc, Inc. Package closure
KR100712313B1 (ko) 2007-02-28 2007-05-02 조현진 개봉성 및 음용성이 향상된 캔 뚜껑
US20150353229A1 (en) * 2012-05-25 2015-12-10 Boston Beer Corporation Beverage delivery can

Also Published As

Publication number Publication date
GB1473275A (en) 1977-05-11
JPS50130589A (enrdf_load_stackoverflow) 1975-10-15
CA1022093A (en) 1977-12-06
DE2511245A1 (de) 1975-10-09
AU7844575A (en) 1976-08-26

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Legal Events

Date Code Title Description
AS Assignment

Owner name: AMERICAN NATIONAL CAN CORPORATION, A CORP OF DE.

Free format text: MERGER;ASSIGNORS:AMERICAN CAN PACKAGING INC., A CORP. OF DE.;TRAFALGAR INDUSTRIES INC., (INTO);NATIONAL CAN CORPORATION;REEL/FRAME:004813/0201

Effective date: 19870430