US3409166A - Self-opening cans - Google Patents

Self-opening cans Download PDF

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Publication number
US3409166A
US3409166A US624051A US62405167A US3409166A US 3409166 A US3409166 A US 3409166A US 624051 A US624051 A US 624051A US 62405167 A US62405167 A US 62405167A US 3409166 A US3409166 A US 3409166A
Authority
US
United States
Prior art keywords
countersink wall
panel
wall
score line
chuck
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
US624051A
Other languages
English (en)
Inventor
Croce Leonard Thomas La
Batchelar Raymond Luscombe
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.)
Primerica Inc
Original Assignee
American Can Co
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 American Can Co filed Critical American Can Co
Priority to US624051A priority Critical patent/US3409166A/en
Priority to CH363468A priority patent/CH461973A/de
Priority to GB02663/68A priority patent/GB1213198A/en
Priority to FR1558106D priority patent/FR1558106A/fr
Application granted granted Critical
Publication of US3409166A publication Critical patent/US3409166A/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
    • B65D17/28—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
    • B65D17/34—Arrangement or construction of pull or lift tabs

Definitions

  • full-open can in which a circular score line is formed proximate to the periphery of the end panel to permit its complete removal.
  • Such full-open cans are suitable for use in the packaging of solid or chunky products such as processed or frozen vegetables and fruits, and frozen juices which are to be removed firom the container in their entirety. They are also desirable for the packaging of products which are customarily removed by insertion of the hand or a spoon or measuring cup into the container. Examples of such products are candy, shelled nut meats and coifee.
  • the removable section has been defined by impressing the circular score line closely adjacent to the junction between the end panel and the countersink wall of the adjacent end seam and the opening tab has been secured to the removable section at a point thereon which is close to the score line so that the user can pull upwardly on the opening tab to exert a force at or near the score line to initiate a breaking out of the removable section.
  • the countersink wall is straight and rises substantially vertically from the end panel.
  • the end closure must be sea-med to the can body with a thin walled chuck, that is, with a chuck having a wall thin enough to pass between the opening tab and the countersink wall.
  • a thin walled chuck is undesirable because it has a proclivity to break or crack and thereby result in excessive down time.
  • the tendency of a chuck to fail can be made less pronounced by designing the chuck with a wall which is thin only in the area which fits between the lift tab and the countersink wall.
  • Such a chuck must be indexed with relation to the end closure so that the lift tab will lie behind the thin wall portion of the chuck. An indexing operation limits the ultimate speed of production ice and creates a propensity for the seaming apparatus to jam from time to time.
  • Still another disadvantage of such an end closure is that an axial force exerted on the top of the countersink wall, as for example, during storage or shipment, is likely to cause tearing of the score line because such a force is transmitted down the straight countersink wall to the end panel and rupture is likely at the score line because it represents a location on the end panel which is close to the countersink wall and has a small section modulus.
  • a container an end closure having a central panel with a removable section defined by a score line located close to the periphery of the panel, an opening tab secured to the panel adjacent to the score line, an outwardly extend: wardly from the periphery of the panel to the flange, the countersink wall including a stepped portion comprising an inwardly extending shoulder and a downwardly extending annular flange, and a countersink wall extending uping wall portion which extends between the shoulder and the central panel, the shoulder being higher than the portion of thetab which is adjacent to the countersink wall.
  • FIG. 1 is a plan view of an end closure made in accordance with the present invention
  • FIG. 2 is an enlarged front elevational view taken partly in section along the line 2-2 of FIG. 1;
  • FIG. 3 is an enlarged front elevational view partly in section showing the end closure of FIG. 1 just prior to being seamed onto a can body;
  • FIG. 4 is an enlarged front elevational view broken away showing partly in section the area .adjacent to the end seam after the end closure has been seamed onto a can body.
  • FIG. 1 a plan view of an end closure indicated generally as 10 having a central panel 12 with a large removable section defined by a circular score line 14 which is positioned close to the periphery of the end panel.
  • the closure is designed so that the removable section may be easily removed from the remainder of the end closure when it is seamed onto a can body.
  • an opening tab 15 is secured to the end panel 12 by means of a hollow rivet indicated generally as 16 which is formed in and integral with the end panel 12.
  • the rivet 16 has a more or less vertical annular shank 18 and an upper transverse wall 20 which is surrounded by the annular bead 22 which bears down on the pull tab to secure it to the end panel 12.
  • the opening tab 15 includes a handle portion 25 including an upturned end 27 which permits the handle portion 25 to be readily engaged by one or more fingers of the user. Extending outwardly from the handle portion 27 are elongated hem portions 29' which enclose a web 30.
  • a U-shaped slit 32 in the web defines a rivet plate 34 which is engaged on its upper surface by the annular bead 22 of the rivet 16 so as to be held against the end panel 12.
  • the end portion 36 of the web lies outside of the U-shaped slit and adjacent to the score line 14 so that when the handle portion 25 is lifted upwardly by a user a fold develops between the ends of the U-shaped slit as the rivet plate is held against the end closure 12 and the elongated hem portions 29 and the integral end portion 36 of the web 30 are forced downwardly to rupture the score 14 and initiate the breaking out of the removable section defined by the score line.
  • the handle 27 is pulled upwardly and to the left to completely separate the removable section defined by the score line 14 from the end closure 10.
  • An annular countersink wall indicated generally as 40 extends generally upwardly from the end panel 12 at a location just outside of the score line 14.
  • the countersink wall 40 features an annular step 42 which includes a shoulder 44 which is at substantially the same level or higher than the portion of the pull tab which is ad jacent to the countersink wall 40.
  • the step 42 separates the upper countersink wall 46 from the lower countersink wall 48.
  • the lower countersink wall 48 is disposed inwardly of the upper countersink Wall 46 which latter merges into an outwardly extending curled flange 50 which is adapted to be formed into a part of an end seam when the end closure 10 is seamed onto a can body.
  • FIG, 3 shows the end closure 10 just prior to being seamed onto a can body indicated generally as 51.
  • the can body 51 includes an annular outwardly extending flange 52, a side wall 54, a bottom end (not shown) and an annular bead 56 which is spaced slightly below the score 14 and is provided so that when the users hand is extended into the can after being opened, it will be directed away from the raw edge created by the tearing of the score 14.
  • the end closure 10 and can body 51 are seamed together by a seaming roll 58 and a chuck 60.
  • the chuck 60 is moved downwardly only far enough for its peripheral lower edge 61 to engage the step 42 of the shoulder 44.
  • the peripheral edge 61 corresponds in diameter to the shoulder 44, and since the shoulder 44 is at substantially the same level or at a level higher than that of any part of the pull tab 15 which is adjacent to the countersink wall 40, it functionsas a stop to insure that the chuck 60 will not bear down upon the pull tab 15 or end panel 12 to create the possibility of inadvertent rupture of the score 14.
  • a central recess 64 is provided in the chuck 60 to provide clearance for the upturned end 27 of the pull tab 15. Because the upturned end 27 is close to the center of the end panel 12, the recess 64 can be centrally located in the chuck 60 so as to preclude the necessity of indexing the end closure '10 and associated pull tab 15 with respect to the chuck 60 prior to the end seaming operation.
  • FIG. 4 the arrangement of parts of the completed can in the area adjacent to the endseam S is shown.
  • a score line on an end panel adjacent to a countersink wall makes, the score susceptible to inadvertent tearing during storage or shipment because an axial forceexerted, at the top of the countersinkwall may be transmitted to the end panel and the score line represents a line of low section modulus on the end panel which is close to the countersink wall.
  • any downward axial force exerted on the top of the countersink wall 40 will be largely dissipated before reaching the end panel 12 in the vicinity of the score line due to flexure in the area of the step 42.
  • the present container has enhanced durability by virtue of the step 42in the end closure 12.
  • An end closure for a container comprising a central panel, a score line adjacent to the periphery of said panel, an opening tab secured to said panel adjacent to said score line, a countersink wall extending upwardly from the periphery of said panel, and a flange extending outwardly from the top of said countersink wall, said countersink wall including an annular shoulder which is at least as far from said central panel as is the top of the portion of said tab which is close to said countersink wall, said shoulder dividing said countersink wall into an upper countersink wall and a lower countersink wall.
  • a container comprising a can body and an end closure secured to said can body in an end seam, said end closure comprising a central panel, a score line adjacent to the periphery of said panel, an opening tab secured to said panel adjacent to said score line, a countersink wall extending upwardly from the periphery of said panel and into said end seam, said countersink wall including a shoulder which is at least as far above said panel as is the portion of said tab which is close to said countersink wall, said'shoulder dividing said countersink wall into an upper countersink wall and a lower countersink wall, said lower countersink wall positioned inwardly of said upper countersink wall.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers Opened By Tearing Frangible Portions (AREA)
  • Cartons (AREA)
US624051A 1967-03-17 1967-03-17 Self-opening cans Expired - Lifetime US3409166A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US624051A US3409166A (en) 1967-03-17 1967-03-17 Self-opening cans
CH363468A CH461973A (de) 1967-03-17 1968-03-12 Endteil für einen Behälter
GB02663/68A GB1213198A (en) 1967-03-17 1968-03-15 Improvements in easy-opening containers
FR1558106D FR1558106A (cs) 1967-03-17 1968-03-15

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US624051A US3409166A (en) 1967-03-17 1967-03-17 Self-opening cans

Publications (1)

Publication Number Publication Date
US3409166A true US3409166A (en) 1968-11-05

Family

ID=24500446

Family Applications (1)

Application Number Title Priority Date Filing Date
US624051A Expired - Lifetime US3409166A (en) 1967-03-17 1967-03-17 Self-opening cans

Country Status (4)

Country Link
US (1) US3409166A (cs)
CH (1) CH461973A (cs)
FR (1) FR1558106A (cs)
GB (1) GB1213198A (cs)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3527377A (en) * 1968-09-27 1970-09-08 Procter & Gamble Protective member for sharp-edge dispensing openings
US3557997A (en) * 1970-01-22 1971-01-26 Continental Can Co Easy opening container
US3599540A (en) * 1969-04-09 1971-08-17 Container Corp Method of making combination of container body and closure therefor
US3608774A (en) * 1970-01-07 1971-09-28 Nat Steel Corp Drawn can for accommodating conventional openers
US4365724A (en) * 1979-12-21 1982-12-28 Metal Box Limited Attaching closure to containers
USD523343S1 (en) * 2003-04-16 2006-06-20 Castner John B Food and beverage container

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3819083A (en) * 1972-07-17 1974-06-25 Continental Can Co Safety edge easy opening container

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2318603A (en) * 1940-07-19 1943-05-11 American Can Co Container
US3322296A (en) * 1965-02-19 1967-05-30 Continental Can Co Easy opening container

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2318603A (en) * 1940-07-19 1943-05-11 American Can Co Container
US3322296A (en) * 1965-02-19 1967-05-30 Continental Can Co Easy opening container

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3527377A (en) * 1968-09-27 1970-09-08 Procter & Gamble Protective member for sharp-edge dispensing openings
US3599540A (en) * 1969-04-09 1971-08-17 Container Corp Method of making combination of container body and closure therefor
US3608774A (en) * 1970-01-07 1971-09-28 Nat Steel Corp Drawn can for accommodating conventional openers
US3557997A (en) * 1970-01-22 1971-01-26 Continental Can Co Easy opening container
US4365724A (en) * 1979-12-21 1982-12-28 Metal Box Limited Attaching closure to containers
USD523343S1 (en) * 2003-04-16 2006-06-20 Castner John B Food and beverage container

Also Published As

Publication number Publication date
FR1558106A (cs) 1969-02-21
GB1213198A (en) 1970-11-18
CH461973A (de) 1968-08-31

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