US3428211A - Container closure having pull-tab opening means - Google Patents

Container closure having pull-tab opening means Download PDF

Info

Publication number
US3428211A
US3428211A US589018A US3428211DA US3428211A US 3428211 A US3428211 A US 3428211A US 589018 A US589018 A US 589018A US 3428211D A US3428211D A US 3428211DA US 3428211 A US3428211 A US 3428211A
Authority
US
United States
Prior art keywords
tear strip
score line
closure
pull tab
rupture
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
US589018A
Other languages
English (en)
Inventor
Jerry F Scharf
William J Lohr
Vinson S Potts
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.)
Crown Cork and Seal Co Inc
Original Assignee
Crown Cork and Seal 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 Crown Cork and Seal Co Inc filed Critical Crown Cork and Seal Co Inc
Application granted granted Critical
Publication of US3428211A publication Critical patent/US3428211A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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

Definitions

  • a container closure having a tear strip opener wherein the removable panel which is defined by a primary score line includes a secondary score line and a pull tab which is secured to the removable panel at the collar portion formed by the primary and secondary score lines.
  • the pull tab extends transversely with respect to the primary and secondary score lines and a lifting of the free end of the tab will rupture the secondary score line and initiate rupture of the primary score line and twist the collar portion to facilitate subsequent rupture of the primary score line.
  • This invention relates generally to container closures and more particularly to an improved closure having a tear strip opener.
  • Closures having a tear strip opener or a pull tab opener, as they are frequently known, of the type contemplated by the instant invention are utilized to form an end wall of sealed containers or cans which are commonly employed to contain liquid, semi-solid or flowable products.
  • Such closures having a tear strip opener generally comprise an end wall forming portion of a container, such as a conventional can, having a generally planar surface provided with a line of weakness such as a score line, defining an area of the end wall known as a tear strip, which is to be removed to form a dispensing opening.
  • the tear strip or removable area is provided with a small key or pull tab terminating at one end in a free end portion adapted to be gripped by the fingers of a user and at the opposite end in a fulcrum portion.
  • the pull tab is secured to the tear strip by suitable means, such as by an integral rivetli-ke formation in the tear strip which is mechanically interlocked about the defining edge of an aperture formed in the pull tab.
  • the pull tab thus forms a handle-like member to be gripped by the user to effect rupture of the closure material along the score line and thereby sever the tear strip from the closure wall to produce an opening in the end wall of the container or can.
  • prior art tear strip type closure constructions are frequently such that the disposition of the portion of the tear strip severed by the initial lifting of the pull tab to initiate rupture of the score line is unfavorable for the subsequent progressive rupture of the remaining intact portion of the score line required to elfect complete severance of the tear strip from the closure.
  • user is frequently obliged to exert variously directed distorting forces upon the pull tab and tear strip in order to effect complete rupture along the score and severance of the tear strip from the closure.
  • a tear strip closure be such that the tear strip can be completely severed and removed therefrom by simple natural movements of the user, such as by a lifting and pulling of the pull tab, which require only a minimum of eflort.
  • the pull tab and the closure wall, from which the integral rivet-like tab connection means is formed can be formed of lighter gauge, and thus less expensive, material.
  • Another object of the present invention is to provide an improved container closure having a tear strip opener which can be easily opened by the average person.
  • a still further object of the present invention is to provide an improved container closure having a tear strip opener wherein a minimum eifort is necessary to effect initial rupture of the preformed score line.
  • Another object of the present invention is to provide an improved container closure having a tear strip opener wherein the likelihood of separation of the pull tab from the tear strip during opening of the closure is reduced.
  • Still another object of the present invention is to provide an improved container closure having a tear strip opener which can be easily opened by the average person by simple natural movements which require only a minimum of effort.
  • a further object of the present invention is to provide an improved container closure having a tear strip opener which can be readily opened by a simple lifting and pulling of a pull tab secured to the tear strip.
  • Another object of the present invention is to provide an improved container closure having a tear strip opener wherein severance of the tear strip is initiated by simply lifting a pull tab secured thereto and the initially severed portion of the tear strip is disposed so as to facilitate the subsequent progressive rupture of the closure material along the remaining intact portion of the score line.
  • FIGURE 1 is a top plan view of a container closure having a tear strip opener embodying the present invention
  • FIGURE 2 is a top plan view of the container closure shown in FIGURE 1 before assembly of the pull tab thereto;
  • FIGURE 3 is a perspective view of the pull tab utilized on the closure shown in FIGURE 1;
  • FIGURE 4 is a sectional view taken along the line 44 of FIGURE 3;
  • FIGURE 5 is a sectional view taken along the line 5--5 of FIGURE 1;
  • FIGURE 6 is a top plan view of a container closure having a tear strip opener embodying the present invention with the tear strip partially severed from the closure;
  • FIGURE 7 is a sectional view taken along the line 7--7 of FIGURE 5;
  • FIGURE 8 is a fragmentary perspective view of the partially opened closure shown in FIGURES 6 and 7;
  • FIGURE 9 is atop plan view of a modified form of the present invention.
  • FIGURE 10 is a top plan view illustrating another modified form of the present invention.
  • FIGURE 11 is a top plan view illustrating still another modified form of the present invention.
  • FIGURES 1, 2, 3, 4, and 5 of the drawings there is shown a container closure 10 formed of a suitable material, preferably an aluminum alloy, having a flexible, substantially flat or planar end wall forming portion 12 provided with a tear strip opener 14.
  • a suitable material preferably an aluminum alloy
  • the outer circular edge or rim of the closure 10 is provided with an annular bead or flange 18 adapted to effect a sealed juncture between the closure 10 and the cylindrical side wall of the container 16 so as to form and end wall thereof.
  • the tear strip opener 14 comprises an elongated pull tab 20 having a transversely centered longitudinal axis AA and an opening pattern or tear strip 22 defined by an endless line of reduced metal thickness or primary score line 24 formed in the planar disc-like end wall 12 of the closure 10.
  • the primary score line 24 is of a circular configuration and is formed closely adjacent the annular peripheral head 18 so that the tear strip 22 defined thereby comprises a removable disc-shaped area which constitutes substantially the entire end wall of the closure 10.
  • the removable area of the closure Wall which is defined by the endless primary score line need not constitute the entire end wall of the closure, but rather can constitute ony a segment thereof and can also be of any desired non-circular configuration.
  • the tear strip 22 also includes a secondary line of reduced metal thickness or score line 26 of limited extent formed radially inwardly of the endless primary score line 24.
  • the secondary score line 26 will be seen to extend generally transversely with respect to the longitudinal axis AA of the pull tab 20 and terminate in opposed terminal ends 28 and 30, respectively, radially inwardly of the primary score line 24 so as to define a tear strip collar portion 32 therebetween.
  • the secondary score line 26 has a slighty arcuate configuration, as best seen in FIGURES 1 and 2, which is generally convex towards the collar portion 32.
  • the secondary score line 26 can include a discontinuity or interruption in the form of a relatively sharp rupture stress concentrating apex or junction 34 formed by angularly intersecting portions of the secondary score line 26 intermediate the opposed ends 28 and 30 thereof.
  • the relatively sharp score line junction 34 which will be seen to be in vertical alignment with the longitudinal axis AA of the pull tab 20, acts as a point of rupture stress concentration to reduce the lifting effort which must be applied to the pull tab to initiate removal of the tear strip 22 from the closure 10, as will be described more fully hereinafter.
  • the pull tab 20 which is also preferably formed of a suitable metal such as aluminum, has a generally elongated configuration and incudes an enlarged free end handle portion 36 preferably in the form of ring 38 adapted to be gripped by the fingers of a user, and a fixed end fulcrum portion 40.
  • the inner and outer edges of the ring 38 are smooth and rounded so as to be free of any sharp edges which might inflict injury on a user gripping the pull tab 20 during an opening operation.
  • the opposed fixed end fulcrum portion 40 terminates in a slightly arcuate end edge 42 which overlies a segment or portion of the primary score line 24.
  • the fulcrum portion 40 is provided with a short longitudinally extending depressed bearing rib 44 as best seen in FIGURES 3 and 4.
  • the rib 44 which can be conveniently formed by simply bending or slightly creasing the fulcrum portion 40 of the pull tab 20 on its longitudinal axis AA, provides a relatively narrow bearing surface which engages the underlying collar portion 32 of the tear strip when the free end portion 36 of the pull tab 20 is lifted.
  • substantially straight longitudinally extending side edges 46 and 48 which will be seen to converge as they extend from the free end portion 36 to the fulcrum end portion 40 of the pull tab 20, can each be provided with a strengthening bead or rib 50 and 52, respectively.
  • Such ribs 50 and 52 provide the pull tab 20 with added rigidity so that it will effectively resist transverse bending during opening of the closure, and can be conveniently formed by hemming or folding the marginal edge portion edge of the tab inwardly upon itself.
  • the pull tab 20 is provided with a suitable aperture 54, through which an integral rivetlike formation 56, formed in the collar portion 32 of the tear strip 22 closely adjacent to the secondary score line 26, extends to mechanically interlock and thereby operatively secure the pull tabe 20 to the tear strip 22.
  • the pull tab 20 is disposed such that the longitudinal axis AA thereof extends radially with respect to both the primary score line 24 and the secondary score line 26.
  • the pull tab 20 will thus be face wisely engaged with the outer surface of the tear strip 22 and will not interfere with normal stacking of the containers 16 for shipment and display.
  • the ring 38 at the free end portion 36 of the pull tab 20 is gripped and lifter or raised from the underlying surface of the closure end wall 12.
  • the free end 36 of the pull tab 20 is lifted, the secondary score line 26 and the portion of the primary score line 24 adjacent the fulcrum portion 40 of the tab will rupture and the collar portion 32 of the tear strip 22 defined thereby will twist sharply out of the plane of the end wall 12, as shown in FIGURES 6, 7, and 8.
  • the sharp angle of entry of the severed collar portion 32 to which the pull tab 20 is secured permits the primary score line 24 to be progressively and completely ruptured to sever the tear strip 22 from the closure 10 by simply pulling the tab away from the closure 10.
  • the initial lifting of the free end portion 36 of the pull tab 20 causes an upwardly directed score line rupturing force to be applied through the integral rivet-like formation 56 to the portion of the collar 32 adjacent the secondary score line 26 as the fulcrum portion 40 simultaneously bears on, and applies a downwardly directed score line rupturing force to the portion of the collar 32 adjacent the outer primary score line 24.
  • the rupture of the inner secondary score line 26 which occurs immediately before, or substantially simultaneously with, the initial rupture of the primary score line 24 reduces the effort necessary to effect such initial rupture of the primary score line 24 (as compared to the lifting effort which would be required to effect initial rupture of the primary score line 24 if the secondary score line were not provided) and assures optimum orientation of the initially severed portion of the tear strip 22 for effecting the complete severance thereof from the closure 10 by simply pulling the pull tab 20 away from the closure 10.
  • FIGURE 9 of the drawings there is shown a modified form of container closure 110 having a tear strip opener 114 embodying the present invention.
  • the contruction of the tear strip opener 114 of the closure 110 differs from the tear strip opener 14 just described in that the inboard or secondary score line 126 comprises a substantially straight line terminating in opposed terminal end portions 128 and 130 radially inwardly of the primary peripheral score line 124.
  • the secondary score line 126 does not include a stress concentrating apex intermediate its opposed end portions.
  • the operation of the tear strip opener 114 is however, substantially as previously described with reference to the tear strip opener 14.
  • FIGURE 10 of the drawings there is shown another modified form of a container closure 210 having a tear strip opener 214 embodying the present invention.
  • the construction of the tear strip opener 214 of the closure 210 differs from that of the tear strip opener 14 previously described in that the secondary score line 226 is formed by two straight line portions which diverge as they extend away from their apex or juncture at 234 adjacent the integral rivet-like formation 256 toward the free end 236 of the pull tab 220 so as to be generally convex toward the collar portion 232.
  • FIGURE 11 of the drawings there is shown another modified form of a closure 310 having a tear strip opener 314 embodying the present invention.
  • the construction of the tear strip opener 314 of the closure 310 differs from that of the tear strip opener 14 of the closure 10 aforedescribed in that the endless primary score line 324 is of a non-circular configuration and the removable area or tear strip 322 defined thereby constitutes only a segment of the closure end wall 312.
  • the secondary score line 326 formed in the tear strip 322 is substantially indentical to the secondary score line 26 previously described in connection with the tear strip opener 14, and terminates in opposed ends 328 and 330 inwardly of the periphery of the tear strip 322 defined by the primary score line 324.
  • the secondary score line 326 and the radially outwardly adjacent portion of the primary score line 324 define a relatively narrow collar portion 332 to which the fulcrum end 340 of the pull tab 320 (shown in broken lines) is attached by an integral rivet-like formation 356 formed in the tear strip 322.
  • a container closure having a peripheral bead for attaching the closure to the end of a container; said closure further having a flexible generally planar disc surrounded by said peripheral bead and adapted to overlie the end of the container to which it is attached, said flexible disc having a first material thickness reducing score defining a predetermined opening pattern and a second material thickness reducing score formed to lie radially inwardly of said first score to define a collar between said scores; an opening tab including a fulcrum portion terminating adjacent said first score and a handle portion; and means securing said fulcrum portion to said collar at a point adjacent said second score to cause the axis of said tab to lie radially of both scores; said score and tab arrangement responding to a lifting of the tab handle portion to fracture said second score and thereby permit said collar to twist out of the plane of said disc to permit a sharp angle of entry as the fulcrum end of said tab fractures said first score, said arrangement further permitting said first score to be fractured along its entire length in response to a pull on
  • a container closure having a tear strip opener in a fiat planar container Wall forming portion thereof comprising in combination a primary endless score line formed in said wall portion defining a tear strip; a secondary score line formed in said tear strip and terminating in terminal end portions spaced inwardly of said primary score line so as to define a collar portion between said primary and secondary score lines; an elongated pull tab including a handle portion at one end and a fulcrum portion at the other end; and means connecting and securing said fulcrum portion of said pull tab to said collar adjacent said secondary score line so that the longitudinal axis of said pull tab extends transversely with respect to said secondary score line and the terminal end of said fulcrum portion of the pull tab is disposed adjacent a portion of said primary score line whereby lifting of the handle portion of said pull tab will effect rupture of said secondary score line, initiate rupture of said primary score line and twist the collar portion out of the plane of said wall so as to facilitate the subsequent progressive rupture of said primary score line to sever said tear strip from said wall and

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers Opened By Tearing Frangible Portions (AREA)
  • Cartons (AREA)
  • Closures For Containers (AREA)
  • Sampling And Sample Adjustment (AREA)
US589018A 1966-10-24 1966-10-24 Container closure having pull-tab opening means Expired - Lifetime US3428211A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US04/589,018 US4183442A (en) 1966-10-24 1966-10-24 Container closure having pull-tab opening means

Publications (1)

Publication Number Publication Date
US3428211A true US3428211A (en) 1969-02-18

Family

ID=24356250

Family Applications (2)

Application Number Title Priority Date Filing Date
US589018A Expired - Lifetime US3428211A (en) 1966-10-24 1966-10-24 Container closure having pull-tab opening means
US04/589,018 Expired - Lifetime US4183442A (en) 1966-10-24 1966-10-24 Container closure having pull-tab opening means

Family Applications After (1)

Application Number Title Priority Date Filing Date
US04/589,018 Expired - Lifetime US4183442A (en) 1966-10-24 1966-10-24 Container closure having pull-tab opening means

Country Status (13)

Country Link
US (2) US3428211A (enrdf_load_stackoverflow)
BE (1) BE705366A (enrdf_load_stackoverflow)
BR (1) BR6794082D0 (enrdf_load_stackoverflow)
CH (1) CH500107A (enrdf_load_stackoverflow)
DE (2) DE1607844A1 (enrdf_load_stackoverflow)
DK (1) DK124069B (enrdf_load_stackoverflow)
ES (1) ES346188A1 (enrdf_load_stackoverflow)
GB (1) GB1138919A (enrdf_load_stackoverflow)
GR (1) GR34698B (enrdf_load_stackoverflow)
LU (1) LU54715A1 (enrdf_load_stackoverflow)
NL (1) NL155501B (enrdf_load_stackoverflow)
NO (1) NO118831B (enrdf_load_stackoverflow)
SE (1) SE342198B (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3938696A (en) * 1974-09-18 1976-02-17 Continental Can Company, Inc. Inclined integral rivet on end panel for tab control
US20240417132A1 (en) * 2021-10-20 2024-12-19 Canpack Food And Industrial Packaging Sp. Z O.O. Food and beverage can tab

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4286728A (en) * 1980-04-11 1981-09-01 Ermal C. Fraze Tab and ecology end
USD556036S1 (en) * 2004-05-11 2007-11-27 Portola Packaging, Inc. Container closure having a pull tab
USD530603S1 (en) * 2004-05-11 2006-10-24 Portola Packaging, Inc. Container closure having a pull tab
USD701121S1 (en) * 2011-10-05 2014-03-18 Bapco Closures Research Ltd Container closure

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3301432A (en) * 1964-03-13 1967-01-31 Continental Can Co Pull key opening can end
US3322296A (en) * 1965-02-19 1967-05-30 Continental Can Co Easy opening container
US3326406A (en) * 1965-06-21 1967-06-20 Dayton Reliable Tool & Mfg Com Easy opening can end
US3338463A (en) * 1964-03-30 1967-08-29 Kaiser Aluminium Chem Corp Pull tab container opener

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3301432A (en) * 1964-03-13 1967-01-31 Continental Can Co Pull key opening can end
US3338463A (en) * 1964-03-30 1967-08-29 Kaiser Aluminium Chem Corp Pull tab container opener
US3322296A (en) * 1965-02-19 1967-05-30 Continental Can Co Easy opening container
US3326406A (en) * 1965-06-21 1967-06-20 Dayton Reliable Tool & Mfg Com Easy opening can end

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3938696A (en) * 1974-09-18 1976-02-17 Continental Can Company, Inc. Inclined integral rivet on end panel for tab control
US20240417132A1 (en) * 2021-10-20 2024-12-19 Canpack Food And Industrial Packaging Sp. Z O.O. Food and beverage can tab

Also Published As

Publication number Publication date
NO118831B (enrdf_load_stackoverflow) 1970-02-16
GR34698B (el) 1968-06-11
US4183442A (en) 1980-01-15
LU54715A1 (enrdf_load_stackoverflow) 1968-05-08
DE1607844C3 (enrdf_load_stackoverflow) 1979-12-20
SE342198B (enrdf_load_stackoverflow) 1972-01-31
DE1607844A1 (de) 1970-08-27
BE705366A (enrdf_load_stackoverflow) 1968-04-19
NL6714399A (enrdf_load_stackoverflow) 1968-04-25
DK124069B (da) 1972-09-11
GB1138919A (en) 1969-01-01
CH500107A (de) 1970-12-15
ES346188A1 (es) 1968-12-01
BR6794082D0 (pt) 1973-03-08
DE6609021U (de) 1972-02-03
NL155501B (nl) 1978-01-16

Similar Documents

Publication Publication Date Title
US3225957A (en) Metal end closure
US3441169A (en) Container opening device
US3701454A (en) Easy opening container closure
US3480171A (en) Container closure
US3380609A (en) Roll-on crown with ring tab
US3465910A (en) Container closure having integral strip opening means
US5232114A (en) Full-open convenience closure
US3780902A (en) Container end closure
US3796344A (en) Non-detachable tear strip and pull tab structure for easy opening container
US5934498A (en) Convenience easy opening end with large removal panel
US3561631A (en) Closure cap for containers
US3527378A (en) Easy-opening closure
US3735892A (en) Full open end having chordal start tear score sections
US4432466A (en) Container having closure panel including integrally formed scoop rupturable therefrom
US3743129A (en) Tear-off closure with reinforcing rib
US3891117A (en) Easy-opening can end construction
US3276613A (en) Crown cap
US4044915A (en) Container end closure
US3556336A (en) Tear-off container closure
US3544025A (en) Full open end
US3182852A (en) Container with pull tab
US3272382A (en) Easy opening container
US3428211A (en) Container closure having pull-tab opening means
US3251503A (en) Easy opening and lifting can-end with dead-end inside score line
US3860143A (en) Easy-open container with nondetached tab