US 3176872 A
Description (OCR text may contain errors)
April 6, 19,65 A. P. zuNDEL METAL END CLOSURE FOR CONTAINER BODY Filed Feb. 28, 1962 mvENToR. .4E T//aPP/z/P .za/mez BY w@ @im Allow/.5v
United States Patent O 3 176 872 METAL END crostini; non CoNrAnsnn irony Arthur Philip Zundel, Cary, Ill., assigner to American Can Company, New York, N .Y.,` a corporation ci' New Jersey Filed Feb. 2S, 1962, Ser. No. 176,280 4 Claims. (Cl. 22d- 54) The present invention relates to an easily removable metal end closure for a container body. More particilarly, it relates to a unique means of fastening a pull tab adjacent one end of a scored area within the metal end closure for easy removal of that portion of the closure defined by the score lines.
Metal `end closures for container bodies, particularly tubular metal can bodies, which are adapted to be readily removed from the body by tearing out a scored area, are well known in the art. In general, the scored area in these prior `art metal end closures is defined by a first pair of substantially concentric score lines adjacent the seam joining the end to the body; and a second pair of score lines joined to the first pair and extending inwardly towards the central portion of the end. Examples of such prior art are U.S. Patents 2,112,231 and 2,946,478.
The difference between vari-ous prior art disclosures over this general configuration outlined above lies in their varying means of freeing the inwardly extending ends ot' the second pair of sco-re lines. While no se ere technical problems exist in scoring the metal end closures in the manner outlined, the prior art has striven to simplify and improve the procedures for providing means for freeing the inwardly extending end of the tear strip.
It is therefore an object of the invention to provide a new and improved structure for freeing one end of a tear strip in a metal end closure for a container.
Another object is to provide a means for freeing one end of a tear strip of the character described which involves a minimum of manufacturing operations.
A further object is to provide a simple means for securely anchoring a pull tab to one end of a tear strip of the character described.
Yet another object is to provide a means for anchoring a pull tab to one end of a tear strip of the character dscribed which is simple and eiciently accomplished with a minimum of extra operations and equipment.
Numerous other .objects and advantages of the invention will 'be .apparent Aas it is better understood from: the following description, which, taken in connection with the accompanying drawings, discloses a preferred embodiment thereof.
The above objects are achieved by providing for a tubular container body, a metal end closure having an embossment located towards the center of the closure, which embossrnent provides in leffect an upstanding rivet extending lthrough -an .aperture in one end of a pull tab, the upper surface of the embossment being flanged or dared outwardly over the periphery of the aperture to securely anchor the pull tab -to the end closure. The embossment is located in proximity to the inwardly extending ends of spaced score lines, the opposite ends of which join or merge with a pair of spaced peripheral score lines in the closure. Upon lifting of the pull tab these inwardly extending score lines break through thereby releasing or freeing this end of the 4tear strip defined by the score lines so that upon continued pulling of the pull tab the tear strip is progressively removed from the closure with the resultant opening of the container.
Referring to the drawings:
FIGURE 1 is -a perspective view of a container having the end closures of the instant invention;
FIGURE 2 is a sectional view taken substantially along line 2 2 of FIGURE l;
Eile-,SF2 Patented Apr. 6, 1965 ICC FGURB 3 is a sectional view tak-en substantially along lines 3 3 of FIGURE l with the opening procedure shown in dot-dash lines;
FIGURE 4 is a fragmentary sectional view of the end closure immediately prior to the anchoring of the pull tab t-o the end; and
FIGURE 5 is an exploded View showing the end closure after removal from the can body.
As a preferred or exemplary embodiment of the instant invention, FIGURE l shows a tubular metal can body lll preferably circular lin cross-section. Can body lll may be seamless such as being formed by impact extrusion or may be -ormed by interlocking the marginal edges of a llat blank in a manner well known to provide a longitudinal side seam l2. A lower end closure 14- is made integral with .the can body lil either by means of a conventional double seam i6 or in the case of an impacted extruded can, is of one piece with the can body lll. An upper end closure generally designated 18 is secured to the body lll by mea-ns of a conventional double seam 2i?.
The end closure iS comprises a countersunk central panel 22, which at its periphery merges with an opstanding countersink wall 24. The outermost periphery of the end 13 extends outwardly from the wall 24 to fro-rm a flange which is interfolded with a corresponding iiange on the can body 1l) to form the seam 2li. A continuons score line 26 extends around the periphery of the panel 22 at the base of the wall 24. A score line 28 spaced concentrically inwardly from -the continuous score lines 26 extends in a circular path in the panel 22; but, unlike the score line 26, does not join itself tor-ming a complete circle but ends at 29 for reasons explained m-ore fully hereinafter. The score lines 26, 2S form a iirst pair of score lines.
At one point 3@ in the length of the score line 25 a score line 32 diverges or lforks from the score line 26 and extends radially inwardly towards the center o-f the panel 22. A score line 311i continuing from the end of the score line 28 adjacent the point Sil also extends radially inwardly towards the center of the panel 22 parallel with the sco-re line 32. A sco-re line 36 extending in a circular path around the center of the panel 22 connects the inner terminals of the score lines 32, 3d.
It can thus be seen that the score lines 36, 34, 32, 2S and 26 define or enclose a removable area or tear strip 3S Within the panel 22. It is to be understood that the inwardly extending pair of score lines 32, 3d need not extend radially inwardly but could extend into the panel 22 at any desired angle. Further, the score line 36, in connecting the ends of the score lines 32, 34, need not be located in the center of the panel 22 and may follow a path other than circular.
A iirst circular boss lib extends upwardly from the panel 22 and includes the area for the most part enclosed by the score line 36. As with the score line 36, the boss lll may have a configuration other than circular and need not be centrally located. However, this construction is preferred because of ease of tooling, registration and production. The boss 4l) may be formed in any suitable manner, such as die-forming during the formation of the end i3, or by drawing after the end 18 is initially formed.
A second boss 42 extends upwardly from the center of the rst boss 4l). The boss 42 also may be struck from the end 13 by any suitable means such as die-forming or drawing. Whether the boss 42 extends upwardly from the boss 4) or from the unbossed panel 22 as mentioned hereinafter, it is essential to the instant invention that the boss 42 be located within the tear strip 3S adjacent the score line 36. Tins construction is necessary to l permit rupture of the score line 36 during opening as explained more fully hereinafter.
The boss 42 extends upwardly through an aperture 46 in one end of an elongated grasping or pull tab 4S. The
air/deva initial assembly of the pull tabV 48 on the boss 42 is shown in FIGURE 4. The pull tab 48 is located on the panel 22 so as to extend beyond and substantially in alignment with the score lines 32, 34.
Tofirmly secure or anchor the pull tab 48 to the panel 22, the upper end of the boss 42 flares radially outwardly over'the periphery of the aperture 46. This outward liare of the boss 42 is readilyv accomplished by swaging. To facilitate this swaging operation the center of the boss 42 hasV therein'ra hollow depression 50 as shown in FIG- URE 4 The depression 50 is Vespecially desirable when theV end 18, including the boss 42, is composed of a relatively hard metal such as steel.
which is the preferred metal for the end 18, a depression 50 is not essential althoughit still facilitates the swaging operation.
As best shown in FIGURE 3 the free end 52 of the pull tab 48, i.e. the end remote from the aperture 46,'
is spaced from the panel 22. This spacing results from the mounting of the pull tab 48 on the first boss 40 with' its free end 52 extending beyond the periphery of the boss 40. This upward displacement of the free end 52 of the tab 48 from the panel 22 provides a space into which ones iingers or a tool may enter to grasp thisV fining it. Score line 26 being continuous or endless will continue to tear until the panel 22 is completely separated from the remainder of the end 18 along line 53. Score line 28,, however, endingV blind at 29' will cause the tear strip 38 to remain attached to the panel 22. In this manner, when the score line 26 has completely torn through, the entire panel including the strip 38 will be removed from the body as shown in FIGURE 5 to expose vthe canned product 54. l
l If desired, the first boss 40 may be omitted so that the pull tab 48 lies ush with the surface ofthe panel 22. However, with such a construction, it is preferred to turn However, if the end 18V is composed of a'relatively soft Vmetal such'as aluminum,
the free end 52 of the tab 48 vupwardly'to facilitate grasp- Y ing of this end.
It is thought that the invention and many of its attendantadvantages will be understood from the foregoingdescription and it will be apparent that various changes maybe made inthe form, construction and arrangement of the 4parts without departing from the spirit and scopeof the invention orsacrificing all of Vits material advantages, the form hereinbefore described being merely a preferred embodiment thereof.
sealinglyengage one end of said body in an end seam, the f inner surface of said closure facing toward the interiorA of said body, a iirst pair of spaced Vscore lines surrounding at least a portion of said panel and disposed adjacent said peripheral port-ion, a second pair of Vspaced score lines continuing from said firstpair of score lines and extending inwardly therefrom, aV single score line joining each of said second pair of score lines at their inwardly' extending ends, said score' lines defining a continuous tear strip within said panel,.and an elongated pull tab secured at one end to said tear strip adjacent saidsingle score line; the improvement comprising a first boss ex.- tending outwardly from the outer surface of said panel,
a second boss extending outwardly'frorn said first boss through an aperture inone end of said pull tab, the outermost surface of said. secondy boss being flared over the periphery of saidaperture to secure said pull tab to said rst boss, the free Vend of said pull tab extending beyond said rst boss to provide aV space between said'free end and the subjacent portion of saidpanel whereby said free end may be manually grasped and lifted toV break throughV said single score line and pulled to remove rsaid tear strip from said panel to open said container.
2. The end closure set forth in claim l wherein said above the level of saidpull tab and;
end seam extends said bosses. Y
3. The end closure set forth in claim 1 wherein said' single score line extends arcuately around said first boss. 4. A metal end closure for a container comprisingi acentral panel; J a removable area within( said panel lines;V a first boss withinsaid area adjacent one of said score lines;
an elongated pull tab having an'aperture adjacent one` end; and
a second boss extending outwardly from said first boss through said apertureV and anged over the periphery of said aperture to secure said one endof said pull tab toV said first boss'with theV other end of said pull tabV being free and extending' beyond` theedge of said first boss to provide a space between` said free end and the subjacent portion of'said panel,
said pull tab adapted to be manually lifted to break; through said one score line and pulled' toremovesaid removablev areaA from'said panel to open said container.
References Cited by the Examiner UNITED STATES PATENTS Y 5/33v Prahl et al. V.. 2720-52 1,907,364 1,955,431 2,029,329 kLjungstrom et al 220-48 Speidel 220-54 ,2,946,478 Clair etal; ..-'220-54 THERONE. CoNDoN, Primary Examiher, EARLE J. DaUMMoND, Examiner.
defined by `score Lymburner f 220'-52 Resef 220,-33