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Publication numberUS3441170 A
Publication typeGrant
Publication dateApr 29, 1969
Filing dateMar 3, 1967
Priority dateMar 3, 1967
Also published asDE1607845A1
Publication numberUS 3441170 A, US 3441170A, US-A-3441170, US3441170 A, US3441170A
InventorsKhoury Nick S
Original AssigneeContinental Can Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Coined bead for improved fill characteristics
US 3441170 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

. Apl 'il 29, 1969 N. s. KHOURY 7 3,441,170.

COINED BEAD FOR IMPROVED FILL CHARACTERISTICS Filed March 5, 1967 INVENTOR NICK S. KHOU RY dim/W31, Wa Ci, ML M ATTORNEYS United States Patent Filed Mar. 3, 1967, Ser. No. 620,497 Int. Cl. B6541 17/20, 7/42 U.S. Cl. 220-54 12 Claims ABSTRACT OF THE DISCLOSURE The cooperation of an end unit with a container body and the fill characteristics of the container may be improved by providing the end unit with a bead coined or pressed therein generally surrounding the end panel thereof.

This invention relates in general to new and useful improvements in end units for cans and like containers, and more particularly to end units of the easy opening type.

The normal easy opening end unit has a tendency to buckle under pressure and this buckling, in turn, exerts a tensile force on the chuck wall of a magnitude to pull the chuck wall radially inwardly away from the body. In certain instances, the chuck wall is pulled away from the body sufficiently to break the seal between the end unit and the body. Another undesirable result is that this uncontrolled buckling will occur to the extent that the end unit has an unsightly appearance and the pull tab which is normally attached thereto unduly projects therefrom so as to interfere with stacking and packaging.

The buckling of the end panel under pressure is normally due to the existence of excess material resulting from the scoring of the end panel to define a tear panel or strip. In the past, the undesired buckling eifect of the excess metal has been greatly reduced or eliminated by providing in the end panel beads which absorb the excess metal. The beads, however, normally have a tendency to retain the planar condition of the end panel and prevents the controlled bulging of the end panel to provide for an increased capacity of the can.

In accordance with this invention, it is proposed to make no attempt to eliminate the excess metal in the end panel due to the forming of score lines therein, and at the same time to provide additional metal in a manner to extend the mechanical dome of the end panel and minimize the chuck wall distortion.

In accordance with this invention, the additional metal provided in the end panel results from the forming of a coined bead area surrounding the end panel with this coined bead area functioning as a hinge to limit the buckling or doming of the end unit to the end panel and thereby hold to a minimum the radial tensile forces applied to the chuck wall.

A further object of this invention is to provide a novel easy opening end unit for cans and like containers wherein the normal loose metal in the end panel resulting from the forming of score lines therein to define tear strips is utilized to an advantage to provide a mechanical dome by the provision of additional loose metal under controlled conditions by the forming of a coined bead surrounding the end panel.

With the above and other objects in view that will hereinafter appear, the nature of the invention will be more clearly understood by reference to the following detailed description, the appended claims and the several views illustrated in the accompanying drawings:

In the drawing:

FIGURE 1 is a plan view of a can of the easy opening type having an end unit formed in accordance with this invention.

FIGURE 2 is a bottom plan view of the end unit of FIGURE 1 prior to the application thereof to a can body.

FIGURE 3 is an enlarged fragmentary transverse sectional view taken along the line 33 of FIGURE 2 and shows the specific section of the outer portion of the end unit.

FIGURE 4 is an enlarged fragmentary vertical sectional view taken along the line 4-4 of FIGURE 1 and shows the domed configuration of the end unit as it exists as a part of a filled can.

Referring now to the drawing in detail, it will be seen that there is illustrated a can which is formed in accordance with this invention, the can being generally referred to by the numeral 10. The can 10 includes a conventional body 11 which has the lower end thereof closed in a conventional manner by an end unit (not shown). The upper end of the body 11 is closed by an end unit which is formed in accordance with this invention and is generally referred to by the numeral 12. The end unit 12 is secured to the body 11 by means of a conventional double seam 13 in the customary manner.

Referring to FIGURES 2 and 3 in particular, it will be seen that basically the end unit 12 is of a conventional construction and includes a central end panel 14, which is joined to the customary chuck wall 15 by means of a shock absorbing head 16. Radially outwardly of the chuck wall 15, the end unit 12 is provided with the customary curl 19 to facilitate the forming of the double seam 13.

The end unit 12, being of the easy opening type, has a readily removable tear portion 17 which is defined by a score line 18. The tear portion 17, which is formed in the end panel 14 and is removable therefrom by a tearing action, is provided at the starting end thereof with an integrally formed rivet 20 which is utilized to secure a pull tab 21 thereto. The end panel 14 is also provided with a pair of protected beads 22, there being one bead 22 on each side of the tear portion 17.

It is to be understood that the score line 18 is formed by a stamping with the metal being displaced as opposed to being removed. The displaced metal results in a looseness of the end panel 14. This looseness of the metal of the end panel 14 results in a buckling thereof under slight pressures. Unless this buckling is controlled, it is undesired and in the past attempts have been made to eliminate the looseness of the end panel by various methods including the formation of metal absorbing beads in the end panel.

In accordance with this invention, it is proposed to utilize the loose metal of the end panel 14 to effect a mechanical doming of the end panel in the filled can. Furthermore, the doming of the end panel which is possible with the loose metal resulting from the forming of the score line 18 is enhanced by the provision of additional loose metal in the end panel. A bead 23 is coined in the end unit 12 surrounding the end panel 14 and intermediate the end panel 14- and the shock absorbing bead 16. The coining operation is preferably formed from the underside of the end unit 12 whereby the thinning of the metal at the coined bead 23 is not apparent. The metal displaced in the forming of the coined bead 23 is primarily displaced radially inwardly into the end panel 14 to provide for a controlled looseness of the end panel 14 whereby a mechanical dome will result in the end unit when it becomes part of a closed container.

Referring now to FIGURE 4 in particular, it will be seen that the end panel 14 is domed so as to increase the capacity of the can 10. It is to be understood that this doming is uniform.

It is also to be noted that the domed end panel 14 is hinged relative to the remainder of the end unit 12 because the coined bead 23, due to the thinning of the metal in the formation thereof, functions as a hinge. This hinging of the domed end panel 14 minimizes the radial inwardly directed forces applied to the chuck wall 15 by pressure within the can on the end unit and eliminates the pulling away of the chuck wall from the body 11 which has occurred in other easy opening end units.

Although only a preferred embodiment of the invention has been specifically illustrated and described herein, it is to be understood that minor variations may be made in the end unit in general and the configuration of the coined bead in particular without departing from the spirit and scope of the invention, as defined by the appended claims.

I claim:

1. In an end unit for cans and like containers of the type including an end panel and a peripheral attaching portion; the improvement comprising an area of reduced thickness disposed intermediate said end panel and said attaching portion, said area of reduced thickness being of a material width as compared to a conventional weakening line type score.

2. The end unit of claim 1 wherein the material displaced in the forming of said area of reduced thickness has been absorbed in said end panel and said end panel has loose material facilitating the controlled doming of said end panel.

3. In an end unit for cans and like containers of the type including an end panel and a peripheral attaching portion; the improvement comprising an area of reduced thickness disposed intermediate said end panel and said attaching portion, the material disposed in the forming of said area of reduced thickness having been absorbed in said end panel and said end panel having loose material facilitating the controlled doming of said end panel, said end unit being of the easy opening type and said end panel having a tear portion defined therein by a score line, and material disposed in the forming of said score line supplementing said material disposed in the forming of said area of reduced thickness.

4. The end unit of claim 1 wherein said area of reduced thickness is in the form of a bead.

5. The end unit of claim 1 wherein said area of reduced thickness is in the form of a downwardly opening bead.

6. The end unit of claim 1 wherein said area of reduced thickness is in the form of a bead and the material displaced in the forming of said area of reduced thickness has been absorbed in said end panel and said end panel has loose material facilitating the controlled domin g of said end panel.

7. The end unit of claim 1 wherein said area of reduced thickness extends entirely about said end panel and forms a hinged connection between said end panel and said attaching portion.

8. The end unit of claim 1 wherein said area of reduced thickness is upwardly bowed and the material displaced in the thinning of said area being from the underside of said end unit.

9. The end unit of claim 1 wherein a shock absorbing bead surrounds said area of reduced thickness.

10. The end uriit of claim 1 wherein said end unit forms an end closure of a container having a product under pressure therein and said end panel is outwardly domed to provide a controlled increase in capacity of said container.

11. An end unit for a can adapted to be filled with a product under pressure, said end unit comprising a peripheral attaching portion attachable to one end of said can, a central panel portion coaxially disposed within said peripheral attaching portion, means integrally connecting said central panel portion with said peripheral attaching portion, a coined bead formed along the juncture of said connecting means and said central panel portion, said coined bead displacing material inwardly so that said central panel portion flexes relative to said connecting means and independently of said attaching portion when said end unit is attached to said can to form a dome and thereby to increase the capacity of said can.

12. An end unit for cans and like containers and wherein said end unit is of the type including a peripheral attaching portion and an end panel with said end panel having a removable panel portion defined by a score line; the improvement residing in said end unit being of a construction wherein said end panel has loose material faciliting the controlled doming of said end panel, said loose material being partially of a result of the forming of score line and partially due to controlled locallized thinning of said end unit.

References Cited UNITED STATES PATENTS 2,210,225 8/1940 Walensky 220-48 2,971,671 2/1961 Shakman 220-66 GEORGE T. HALL, Primary Examiner.

U.S. Cl. X.R. 220-66

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2210225 *May 3, 1938Aug 6, 1940Easycantop LtdCan
US2971671 *Oct 31, 1956Feb 14, 1961Pabst Brewing CoContainer
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3774801 *Feb 22, 1971Nov 27, 1973American Can CoReinforced metal can end
US3875884 *Jan 22, 1973Apr 8, 1975Nat Can CorpFull open end and method of making
US3979009 *Oct 17, 1975Sep 7, 1976Kaiser Aluminum & Chemical CorporationContainer bottom structure
US4217843 *Dec 8, 1978Aug 19, 1980National Can CorporationMethod and apparatus for forming ends
US4361246 *Dec 17, 1980Nov 30, 1982Alexander NelsonContainer construction
US4448322 *Oct 11, 1979May 15, 1984National Can CorporationMetal container end
US4577774 *Mar 12, 1985Mar 25, 1986Ball CorporationBuckle resistance for metal container closures
US4606472 *Dec 9, 1985Aug 19, 1986Metal Box, P.L.C.Reinforced can end
US4790705 *Feb 11, 1987Dec 13, 1988American National Can CompanyMethod of forming a buckle resistant can end
US4796772 *Apr 14, 1988Jan 10, 1989Ball CorporationMetal closure with circumferentially-variegated strengthening
US4809861 *Feb 11, 1987Mar 7, 1989American National Can CompanyBuckle resistant can end
US4832223 *Dec 8, 1987May 23, 1989Ball CorporationContainer closure with increased strength
US4883190 *Aug 15, 1988Nov 28, 1989Rampart Packaging, Inc.Thermoplastic bellows lid for thermoplastic containers
US4991735 *May 8, 1989Feb 12, 1991Aluminum Company Of AmericaPressure resistant end shell for a container and method and apparatus for forming the same
US5149238 *Jan 30, 1991Sep 22, 1992The Stolle CorporationPressure resistant sheet metal end closure
US5829623 *Nov 24, 1993Nov 3, 1998Toyo Seikan Kaisha, Ltd.Easily openable can lid
US5832770 *Oct 8, 1993Nov 10, 1998Schmalbach-Lubeca AgProcess for further treating a closure end made of sheet
US5865587 *Jan 18, 1995Feb 2, 1999Maiko Engineering GmbhTool for a seaming machine
US5987956 *Nov 10, 1998Nov 23, 1999Schmalbach-Lubeca AgProcess for further treating a closure end made of sheet
US6123493 *Feb 1, 1999Sep 26, 2000Schmalbach-Lubeca AgTool for a seaming machine
US6223931 *Sep 20, 1999May 1, 2001Schmalbach-Lubeca AgClosure end made of sheet
US7370774Sep 28, 2006May 13, 2008Crown Cork & Seal TechnologiesCan end
US7591392Nov 1, 2004Sep 22, 2009Crown Packaging Technology, Inc.Can end
US8157119Sep 1, 2009Apr 17, 2012Crown Packaging Technology, Inc.Can end
US8496132Mar 21, 2012Jul 30, 2013Crown Packaging Technology, Inc.Can end
US8851323Jul 29, 2013Oct 7, 2014Crown Packaging Technology, Inc.Can end
US20040238546 *Feb 3, 2004Dec 2, 2004Watson Martin JohnCan end
USRE33217 *Aug 19, 1988May 15, 1990Ball CorporationBuckle resistance for metal container closures
EP0088968A1 *Mar 4, 1983Sep 21, 1983Ball CorporationA method for further forming a metal closure and a metal container end
EP0103074A2 *Jun 10, 1983Mar 21, 1984Ball CorporationIncreased strenght for metal closures through reversing curved segments
EP1361164A1 *Apr 22, 2002Nov 12, 2003Crown Cork & Seal Technologies CorporationCan end
WO2003089167A1 *Apr 10, 2003Oct 30, 2003Crown Cork & Seal Tech CorpCan end
Classifications
U.S. Classification220/273, D09/438, 220/270, 220/600
International ClassificationB65D17/28, B65D17/34
Cooperative ClassificationB65D17/165
European ClassificationB65D17/16B2