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Publication numberUS3696961 A
Publication typeGrant
Publication dateOct 10, 1972
Filing dateOct 20, 1970
Priority dateOct 20, 1970
Also published asCA958664A1, DE2114156A1, DE2114156B2
Publication numberUS 3696961 A, US 3696961A, US-A-3696961, US3696961 A, US3696961A
InventorsAlbert J Holk Jr
Original AssigneeContinental Can Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Protective edge for easy opening container
US 3696961 A
Abstract
An easy opening container in which the end closure is formed with annular fold bands. A weakening line to define a removable panel portion is formed in the central panel slightly outboard of the folded smooth edge of the annular fold bands so that the folded edge protects the user from the sharp edges after removal of the removable panel portion.
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Claims  available in
Description  (OCR text may contain errors)

United States Patent 1 3,696,961 Hulk, Jr. 51 Oct. 10, 1972 [54] PROTECTIVE EDGE FOR EASY 3,434,623 3/1969 Cookson ..220/54 OPENING CONTAINER 3,447,713 6/1969 Stec ..220/54 [72] Inventor: Albert J Holk Jr. Frankfort In. 3,527,377 9/1970 Colby et al. ..220/54 [73] Assignee: Continental Can Company, Inc., Primary Examiner-George T. Hall New York, NY. Attorney-fret! P. Kostka, Joseph E. Kerwin and Wil- 221 Filed: Oct. 20, 1970 [211 App]. No.: 82,260 [57] ABSTRACT ti An easy opening container in which the end closure is f S App on Data formed with annular fold bands. A weakening line to Commuatlon-lI1-Pa1't 0f 815,043, P" define a removable panel portion is formed in the cen- 10, 1969, abandoned.

US. Cl. ..220/54, 220/906 Int. Cl. ..B65d 17/20 Field of Search ..220/54, 27, 48, 90.6

References Cited UNITED STATES PATENTS 2/ 1967 Taylor ..220/54 tral panel slightly outboard of the folded smooth edge of the annular fold bands so that the folded edge protects the user from the sharp edges after removal of the removable panel portion.

This disclosure also relates to a method for forming the above described easy opening end closure wherein the weakening line is formed in the end panel prior to complete formation of the fold band.

6 Claims, 12 Drawing Figures l3 5 I0 28 lfl 24 3,: L

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ATT'Y PROTECTIVE EDGE FOR EASY OPENING CONTAINER This application is a continuation-in-part of US. Pat. application Ser. No. 815,043 filed Apr. 10, 1969 now abandoned.

BACKGROUND OF THE INVENTION The present invention relates to easy opening containers and more particularly to a new and improved easy opening container of the full panel opening type and to the method of forming the same.

Full opening containers of the type to which the present invention relates include an end closure of which the end panel is formed with a weakening line located closely adjacent to the chuck wall. The weakening line is formed by scoring and defines a removable panel section to which there is attached a pull tab. The pull tab is mounted so that upon initial lifting thereof the nose of the tab penetrates the weakening line to initiate the severance of the removable panel section from the end panel. Thereafter, the pull tab is pulled upwardly so that the remainder of the weakening line is ruptured and the removable panel portion separated from the remainder of the panel substantially in the form of a disc.

The opening thus formed in the end closure is bounded by a horizontal ledge which terminates in a sharp raw edge caused by the severance of the removable panel portion therefrom. This sharp edge is somewhat objectionable because it may cause injury by cutting the users hand or otherwise damage an article which may be inserted through the opening.

The edge on the removable portion is also sharp and is a hazard if carelessly discarded.

SUMMARY OF THE INVENTION By the present invention, it is proposed to provide a full opening easy opening container having an end closure constructed and arranged so that the raw edge about the horizontal ledge is protected after severance of the removable panel portion.

It is also proposed to provide a full opening easy opening container in which the edge on the removable panel is protected.

A further embodiment is proposed wherein both the edge on the ledge remaining on the container and the edge on the removable panel portion are protected.

It is a further object to construct an easy opening end so as to inhibit the flexure of the panel portion adjacent the score line and thereby to facilitate the separation of the removable panel portion.

It is still a further object to provide a new and novel method for fonning a full easy opening end closure constructed in the manner specified in the immediately foregoing objects.

In one form of the invention, the foregoing objects are accomplished generally by an end closure having an annular horizontal folded panel in the form of a band disposed adjacent to the end closure chuck wall and in which a weakening line is formed in the panel so that the folded edge of the band provides a smooth surface which bounds the opening after the separation of the removable panel portion along the weakening line to thereby provide a protective edge.

In another form of the invention the panel of the end closure is provided with a stacked pair of folded bands of which one folded band presents a smooth edge protecting the cut edge on the ledge extending from the chuck wall and the other folded band presents a folded edge protecting the cut edge of the removable panel portion.

In still another form of the invention a folded panel portion is provided on either one of the ledge or removable panel portions and a plastic shield is adhered to the unfolded portion so as to extend beyond the cut edge resulting from removal of the removable panel portion.

In carrying out the method of constructing the end closure of the present invention, the annular fold panel is formed in stages and the weakening line is formed by scoring prior to the final fold step.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a fragmentary perspective view of an easy opening container incorporating the easy opening structure of the present invention;

FIG. 2 is a top plan view of an easy opening container end closure with a portion of the panel being broken away to show underlying details of the annular fold band;

FIG. 3 is a fragmentary cross-sectional view of the container taken generally along the lines 3-3 of FIG. 2 and showing the rupture of the panel along the weakening line upon initial lifting of the pull tab;

FIGS. 4, 5, 6 and 7 are greatly enlarged fragmentary sectional views showing sequentially how dies are employed to form the annular folded portion and in FIG. 6 showing the scoring die performing the weakening line prior to the final folding of the annular band by the final folding dies shown in FIG 7;

FIG. 8 is a fragmentary cross-sectional view of another form of the invention showing a plastic band disposed for separation with the removable panel por tion to provide a protective edge;

FIG. 9 is a fragmentary sectional view of a third embodiment of the invention showing the folded annular panel formed on the removable panel portion;

FIG. 10 is a fragmentary cross-sectional view of a fourth embodiment of the invention showing annular fold panels formed on both the ledge and the removal panel portion of the end closure; and

FIG. 11 is a fragmentary cross-sectional view of a fifth embodiment of the invention in which the fold panels are arranged somewhat differently from that shown in FIG. 10.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawing particularly to FIGS. 1 to 3. There is shown a sheet metal can 10 having a tubular sheet metal body 11. Secured to the upper end of the metal body 11 as by means of a double seam 13 is an easy opening end closure 12 embodying the structure of the present invention. The lower end, not shown, of the body 11 is also provided with an end closure which is fixed thereto by a double seam.

The container body or can body 11 if formed from a metal blank which is formed into tubular configuration and its marginal edges bonded into a longitudinally extending side seam.

The upper end closure 12 may be formed from either tin plate tin free steel, black plate or aluminum and includes a substantially horizontally extending central panel 14 which extends over and covers the open end of the can body. The central panel is recessed within the body 11 so that the horizontal plane in which it lies is below the level of the lower edge of the double seam 13 as shown in FIG. 3. At its periphery, the panel 14 is formed with a chuck wall 16 which terminates in a horizontal flange l7 and a curled end 18 as shown in FIGS. 4-7. The horizontal flange 17 and curled end are double seamed into the can body 11.

In accordance with the present invention, the central panel 14 is bent back upon itself outwardly away from the center and again inwardly toward the center of the body 11 to form an annular fold 19 adjacent to the chuck wall 16. The fold band 19 thus comprises a double fold or two layers 21 and 22 which are disposed below the panel 14. It is to be particularly noted that the fold provides a turned smooth or hemmed edge 23 facing along the interior of the container. Moreover, the panel portion 14 superimposed over the annular fold 19 is in close proximity to the chuck wall 17 and extends substantially planar toward the center of the container body 1 l.

Formed in the panel portion 14 inwardly of the turned edge 23 is a weakening line 24 along which a removable panel portion 26 is separated from the panel. The weakening line 24 is formed by means of scoring or the like as more fully to be described hereinafter. The weakening line 24 extends substantially continuously about and substantially concentric with the chuck wall 16. Disposed closely adjacent to the primary weakening may be a second concentric score 25 which serves as an anti-fracture score to relieve the stresses in the weakening line.

Fixed to the removable panel portion 26, as by a rivet 27 which may be formed integral with the panel, is a pull tab 28. The pull tab 28 is substantially rigid along the length thereof and is formed at one end with a ring or finger grip portion 29 and the other end with a penetrating nose 3]. The nose 31 is disposed adjacent to or over the weakening line 24 so as to penetrate the latter upon initial upward tilting of the pull tab 28. As shown, the pull tab 28 is tiltable about an attachment ear 32 defined by a lance formed in the tab body. Upon tilting of the tab 28, the nose 31 is operative to initially sever the removable panel portion along the weakening line 24 as shown in FIG. 3. It is to be noted that the weakening line 24 lies inwardly of and in close proximity to the smooth hemmed edge 23 of the annular fold band 19 so that upon downwardly movement into the severing position there is no interference to resist the downwardly bending of the removable panel portion 26.

It is also to be noted that the annular band 19 tends to render the area in which the score line is located more rigid by reducing the flexibility of the relatively thin guage metal from which the end closure 12 is made. This increased rigidity at the score line aids in facilitating the removal of the removable panel portion 26 because downward bending of the panel is resisted and thereby minimizes the amount of force which must be applied on the pull tab 28 to initially sever the weakening line 24. Moreover, upon upward pulling of the pull tab 28 to separate the remainder of the removable panel 26 from the panel 14 along the weakening line 24, the annular fold band also serves to resist upward bending and facilitates the further separation.

Referring now to FIGS. 4, 5, 6 and 7 illustrating the stations for forming the end panel closure 12 of the present invention, in FIG. 4 there is illustrated the first station for forming the same. The end closure 12 is initially in the form of a disc and is positioned between a lower male die set 36 and an upper female die set 37. The lower male die set 36 includes a drawing punch 38 which is received within an axial recess 39 of a draw die 41 of the upper female die set 37. Concentrically disposed about the draw die 41 and the draw punch 38 respectively is a lower flange forming member 42 and an upper flange forming member 43. A forming punch 46 concentric with the upper flange forming die 43 serves to form a downwardly depending lip 18a on the flange 17.

Initially, the flat disc is placed between the lower male die set 36 and the upper female die set 37. As the upper and lower dies close together, the flange forming members 42 and 43 clamp the disc therebetween along the marginal edge portions thereof. Thereafter, the lip forming member or punch 46 may descend to form the depending lip 18a. The female die 41 and draw punch 38 also close to form a hat section 14a which projects substantially above the flange 18. The hat-shaped section 14a includes a horizontal top 14c which defines the central panel 14 and an upstanding flange 14b from which the annular fold band 19 is formed as more fully to be explained hereinafter.

The partially formed end unit as formed in FIG. 4 is then transferred to a second station as shown in FIG. 5 wherein a second set of dies 47 and 48 including an upper die member 49 in the form of a hammer and a lower die member 51 in the form of an anvil. Disposed concentrically about the hammer 49 and anvil 51 is a pair of clamping rings 52 and 53 which when closed clamp the chuck wall 16 adjacent the lower end hereof. Thereafter, the hammer 49 strikes the horizontal web 14c and forces the latter downwardly into engagement with the anvil 51. This causes the vertical wall 14b of the hat section to be reformed into a partially loosely folded condition as shown, in the annular space provided between the side wall of the anvil 51 and the upper ring clamp 52. It is to be noted that the horizontal wall or panel is then at substantially the same level as the flange 17.

Thereafter, the second stage end closure .is transferred to a third station as shown in FIG. 6 at which the previous reformed hat section 14a is scored by a scoring die set including a scoring tool 54 and an anvil 56. The scoring tool 54 includes a primary scoring rib 57 and an anti-fracture scoring rib 58. The anti-fracture scoring rib 58 serves to reduce the stresses on the primary score and may be omitted if the metal from which the end closure is made is not subject to fracture causing stresses on the primary score at the primary score 24. For supporting the partially folded end closure, there is provided a nesting block 59 which accommodates and supports the chuck wall 16 therein. It is to be noted that the end closure is supported so that no further bending occurs during the scoring operation when the anvil 56 and scoring tool 54 are closed. The scoring of the end closure 12 in this manner permits an accurate control of the residual thickness of the weakening line 24. This control of the thickness is not possible if the scoring is formed after the annular band 19 is formed because of the multiple thickness of the fold band structure 19. With a multiple thickness fold, it is not possible to always maintain a consistent and exact thickness of the fold layers 21 and 22 and the overlying panel 14 when the end closures are made on a mass production basis.

The partially formed and scored end closure 12 is thereafter transferred to the fourth station for final bending as shown in FIG. 7. The fourth station includes an upper die set including a hammer 61 and a lower die set providing a nesting block 62 into which the partially formed and scored end closure 12 is positioned. The lower nest block 62 includes an annular groove 63 in which the fold 19 is received when the upper and lower die set are closed. As shown, the hammer and nesting blocks 61 and 62, respectively are shaped so that upon closing the layers 21 and 22 are guided to be received within the groove 63.

In connection with the final folding operation, it is to be noted that the partially and loosely folded vertical web 14b, makes it possible to complete the fold 19 into the nesting block 62 without causing a fracture along the score or weakening line 24. This is of significance, because in the absence of, forming a partially folded side wall 14b to complete the fold at the second station it has been found impractical to form the weakening line 24 prior to forming the fold band 19.

Referring now to FIG. 8, there is shown a modified arrangement of the structure shown in FIGS. 1-3. The central panel 14 is formed with a circumferential downwardly depressed head 33. The annular folded panel portion 19 is folded inboard and adjacent to the bead 33. The score line 24 is located relative to the folded edge 23 in the same manner as described heretofore in connection with FIGS. l3.

Attached to the underside of the removable panel portion 26 is a band 34 of a pliable plastic such as plastisol. The plastisol band 34 is adhered by a suitable adhesive coating such as vinyl resin which may be applied by spot coating on the removable panel portion The remainder of the underside of the panel 14 including the fold portion 23 may be coated with a coating non-adherent to the plastisol as for example a thermo setting resin. The plastisol band 34 may be applied by spin lining so that the fold edge 23 restricts the outward flow of the plastisol.

The removable panel portion 26 is separated from the panel similar to the manner explained in connection with FIG. 1-3. When the removable panel portion 26 is separated, the portion of the band 34 lying in the 26 upon removal thereby to protect the cut edge from contact by the user.

A third embodiment of the protective structure is shown in FIG. 9. As shown, the panel 14 of the end closure 112 is formed with a fold band 119 disposed a greater distance from the chuck wall 16 than the fold band 19 in the embodiment of FIGS. l-3. This permits a score line 122 to be formed in the annular space between the chuck wall 16 and an inner folded edge 124. The score line 124 is located such that upon severance by a pull tab 125 in the manner described in connection with FIGS. 1-3, the folded edge projects outwardly of the severed edge of the sufficient amount to prevent free contact therewith. In this manner, the cut edge of the removable panel portion 126 is protected.

If desired, the edge on the ledge 128 may be protected by a plastisol band 134. The plastisol band is adhered to the underside of the ledge 118 as by a spot coating by a band of an adhesive such as a vinyl resin coating. The vinyl resin coating may be applied on an non-adherent coating such as a thermo-setting resin coating covering the underside of the panel. The portion of band overlying the thermo-setting coating is not adherent thereto so that upon severance of the removable panel portion 126, the band 134 remains adhered to and projects outwardly of the cut edge of the ledge 128.

Referring now to FIG. 10, there is shown a fourth embodiment of the invention. The end closure 212 includes a central panel 214 which is formed with a pair of radially spaced annular fold panels 215 and 216. The panel 215 includes fold layers 217, 218 and 219. The fold layer 218 is common to the fold panel 216 which also includes fold layers 220 and 221. The fold layers 217 and 218 are connected by a folded edge 222 and the fold layers 220 and 221 by a folded edge 223. Provided on the fold layer 219 is a score line 224. The score line 224 is located so that upon separation of the removable panel portion 225 defined by the score line 224, the raw or cut edges contiguous to the fold layers are protected by the folded edges 222 and 223, respectively.

For removing the removable panel portion 225, there is provided a pull tab 227. The pull tab 227 is mounted in substantially the same manner as the pull tab of FIGS. 1-3. The pull tab 227 includes a downwardly projecting nose 228 which overlies the score line 224. Upon tilting of the pull tab 227, the pull tab nose 228 severs the score line 224 and the folded panel 228 is depressed downwardly past the folded edge 224. Thereafter, the pull tab 227 is pulled upwardly so that the removable panel 225 is completely separated. In this matter, the fold panel 216 is removed with the removable panel portion and fold panel 215 remains attached to the container. The cut edge overlying the folded edge 224 is protected thereby and the folded edge 223 protects the cut edge on the removable panel portion 225.

Referring now to FIG. 11, there is shown another embodiment of the invention differing from the embodiment of FIG. 10 by the fact that annular folded panels 315 and 316 are folded toward the interior of the container rather than the exterior. The folded panel 315 includes an outer layer 317, an intermediate layer 318 and a bottom layer 319. The bottom layer 319 forms the upper layer of the folded panel 316. Underlying the layer 319 are fold layers 320 and 321. The fold layers 317 and 318 are folded along afolded edge 322 while the fold layers 320 and 321 are folded along the folded edge 323.

A score line 327 is formed in the panel 319 between the fold edges 322 and 323. The score line 323 is severed by tilting of the pull tab 324 so that a nose 325 engages the weakening line 327 so that the portion of the fold panel 316 adjacent thereto is depressed downwardly into the container body. Thereafter, upward pulling of the pull tab 324 causes the remainder of the removable panel portion 326 to be separated from the end closure.

It is to be noted that upon separation of the removable panel portion that the folded edge 322 protects the cut edge of the score line remaining on the end closure, while the folded edge 323 protects the cut edge on the removable panel portion 326.

Referring now to FIG. 12 there is shown a still further embodiment of the invention in which an end closure 410 has fold layers 411 and 412 underlying a marginal panel 413 extending from the chuck wall 414. The fold layers 411 and 412 define an annular fold panel 415. Connecting the fold layers 411 and 412 is a folded edge 416. Disposed closely to the folded edge 416 on the panel portion 413 is a score line 417 which defines a removable panel portion 418. Mounted on the removable panel portion similar to the manner described in connection with the prior embodiments is a pull tab 419 having a nose 421. Upon tilting of the pull tab 419 the score line is severed and upward pulling thereafter completely separates the removable panel. When the removable panel portion 418 is completely separated, the folded edge 416 of the fold panel 419 protects the cut edge bounding the portion 418.

If desired the cut edge on the ledge may be protected by a plastisol band (not shown) applied to the underside of the end closure so as to remain adhered to the end after removal of the removable panel portion.

What is claimed is:

1. An easy opening container comprising an end closure having a panel and an upstanding chuck wall, said panel being folded to provide a double folded annular band, a weakening line formed in said panel defining a removable panel portion and a panel ledge extending from said chuck wall, said folded annular band having an inner periphery defined by a turned smooth edge, a pull tab fixed to said removable panel portion for separating said removable panel portion from said panel along said weakening line, said weakening line being located so that said folded annular band is disposed on said panel ledge after removal of said removable panel portion whereby said turned smooth edge provides a protective edge along the severed edge of said weakening line on said panel ledge, and a plastic band adhered to said panel for removal with said removable panel portion for providing a protective edge along the severed edge of said weakening line on said removable panel portion.

2. An easy opening container comprising an end closure having a panel and an upstanding chuck wall, said panel being folded to provide a double folded annular band, a weakeni line form din sai anel def removable panei aortion and a panel l dge pro fi ng from said chuck wall, said folded annular band having a periphery defined by a turned smooth edge to provide a protective edge, a pull tab fixed to said removable panel portion for removing said removable panel portion from said panel along said weakening line, said weakening line being located so that said folded annular band is disposed on said removable panel portion upon removal of said removable panel portion whereby said turned smooth edge provides a protective edge along the severed edge of said weakening line on said removable panel portion.

3. The invention as defined in claim 1 wherein a plastic band is adhered to said panel so as to remain attached to said panel ledge after removal of said removable panel portion, said plastic band providing a protective edge along the severed edge of said panel ledge after removal of said removable panel portion.

4. An easy opening container comprising an end closure having a panel and a chuck wall, said panel being folded to provide a stacked pair of double folded annular bands having a fold band common to said pair, said double folded annular bands each having a periphery defined by turned smooth edges, said turned smooth edges being located on opposite sides of said common panel, a weakening line formed on said common fold panel defining a removable panel portion and a panel ledge extending from said chuck wall and located so that said respective turned smooth edges provide protective edges along the severed edge of said weakening line on said removable panel portion and the severed edge on said panel ledge when said removal panel portion is removed from said panel, and a pull tab fixed to said removable panel portion for removing said removable panel portion from said panel along said weakening line.

5. The invention as defined in claim 4 wherein said pair of double fold bands are stacked on the outer side of said panel.

6. The invention as defined in claim 4 wherein said pair of double fold bands are stacked on the underside of said panel.

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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3765352 *Mar 27, 1972Oct 16, 1973Fraze Ermal CCombined can and end with means for protecting against severed score
US3794206 *Apr 6, 1972Feb 26, 1974De Line JFrangible opening means for a container lid
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US3837524 *Feb 28, 1973Sep 24, 1974J SchubertEasy opening container wall
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WO1988005407A1 *Dec 23, 1987Jul 28, 1988Weirton Steel CorpDisc removal end wall structure with safety features
Classifications
U.S. Classification220/269, 220/906, 220/712
International ClassificationB65D17/40, B65D8/20, B21D51/44, B21D51/38, F16G15/04
Cooperative ClassificationB65D17/163, Y10S220/906, B21D51/383
European ClassificationB21D51/38B, B65D17/16B1