New! View global litigation for patent families

US3485410A - Pressure relief score - Google Patents

Pressure relief score Download PDF

Info

Publication number
US3485410A
US3485410A US3485410DA US3485410A US 3485410 A US3485410 A US 3485410A US 3485410D A US3485410D A US 3485410DA US 3485410 A US3485410 A US 3485410A
Authority
US
Grant status
Grant
Patent type
Prior art keywords
line
panel
portion
end
tab
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
Inventor
Arnold R Boik
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.)
Continental Can Company Inc
Original Assignee
Continental Can Company 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
Grant date

Links

Images

Classifications

    • B65D17/4011
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D2205/00Venting means

Description

v,1\.R.Efc il PRESSURE RELIEF scoRE med Jan, s, 196e INvEN'roR ARNOLD Rom United States Patent ABSTRACT OF THE DISCLOSURE This disclosure has to do with an easy opening container wherein a product is packaged therein and sealed `at a pressure other than atmospheric pressure. In order to automatically form a vent opening in the container in advance o-f the rupture of the container during the opening operation performed thereon, the removable panel portion of the container is provided with a weakening line in the form of a score which underlies the pull tab utilized for opening the container and which is protected by the pull tab. The weakening line is disposed in an area of the container which is initially stressed prior to the rupture of the' container panel during the opening of the container and the strength of the panel along the weakening line is c.

such to assure the initial rupture therealong.

This invention relates in general to new and useful improvements in easy opening container, and more particularly to the formation of a vent opening in a container prior to the tearing out of a removable portion thereof.

Although great strides have been made in the formation of easy opening containers of the type wherein a pull tab is provided for facilitating the initial rupture of the container and the tearing out of a removable panel thereof, there still remain problems when the container is packed at a pressure other than atmospheric pressure. If the container is vacuum packed, there is a tendency for implosion. On the other hand, if the container is packed at a pressure higher than atmospheric, when initial rupture occurs, there is a tendency for the air or other enp trapped gases to rapidly rush out through the initially formed opening carrying a portion of the contents of the container therewith. This invention particularly relates to the solution of these problems,

This invention specifically has to do with an easy opening container end unit of the full opening type wherein the problem of implosion and explosion is eliminated by the provision of a specific weakening at a specific point on the container end unit. In a preferred embodiment of the invention, the weakening line is in the form of a score which extends generally transversely of the axis of the associated pull tab and underlies the pull tab so ,as to be protected thereby.

Another feature of the weakening line formed in accordance with this invention is that `the weakening line has reversely curved ends so as to restrict the tearing of the endV unit along the weakening line. p A further feature of the invention is that the ends of the weakening line converge towards one another and are generally directed to the point of engagement of the pul tab with a peripheral weakening line which defines the removable panel portion with the weakening line functioning as a hinge line during the initial opening of the container.

A further feature of the invention is the positioning of v "ice 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 drawing:

IN THE DRAWINGS:

FIGURE 1 is aplan view of a can having an end unit formed in accordance with this invention.

FIGURE 2 is an enlarged fragmentary vertical sectional view taken along the line 2-2 of FIGURE 1 and shows the specific details of the end unit. i

FIGURE 3 is an enlarged fragmentary horizontal sectional view taken along the line' 3--3 of FIGURE 2 and shows specifically the outline of the weakening line and the relationship thereof with respect to a rivet which secures the pull tab to the end unit.

FIGURE 4 is an enlarged fragmentary vertical sectional view similar to FIGURE 2 and shows the initial rupture of the end unit along the weakening line as an opening pressure is being applied to the end unit through the use of the pull tab.

FIGURE 5 is an enlarged fragmentary vertical sectional view similar to FIGURE 2 showing the end unit after the movement of the pull tab to a final rupturing position prior to the tearing out of the removable panel portion.

Referring now to the drawing in detail, it will be seen that there is illustrated a container in the form of a can which is generally referred to by the numeral 10. The can 10 includes a body 11 which is of a conventional construction and which has the upper end thereof closed by means of an end unit, which end unit is generally referred to by the numeral 12 and which is the subject of this invention. The end unit 12 includes an end panel 13 which has the peripheral portion thereof secured to the body 11 by means of a conventional double seam 14.

It will be readily apparent from FIGURE 1 that the end unit 12 is of the full opening type in that the end panel 13 is` provided with a peripheral weakening or score line 15 which is disposed closely adjacent the outer extremity of the end panel 13. In accordance with this invention, the end panel 13 is initially ruptured along a portion of the score line 15 and thereafter the portion of the end panel defined by the score line 15 is torn out along the'score line. This removable panel portion. is defined by the numeral 16.

-In order to facilitate the rupture of the end panel 13 along the score line 15, the removable panel portion 16 is provided with a pull tab 17 of the lever type. The pull tab 17 has a central portion thereof permanently secured to the removable panel portion 16 by means of a rivet 18 which is integrally formed with the removable panel portion 16 in a conventional manner. The pull tab 17 has a nose 20 which is aligned with a part ofthe score line 15 and when the opposite end of the pull tab 17 is elevated relative to the removable panel portion 16, the nose 20 exerts a downwardly directed pressure on the removable panel portion 16 at the score line 15 with the pressure, upon the continued lifting of the pull tab 17, being sufficient to effect the rupture of the end panel 13 along the score line 15. After an initial rupture of the end panel 13 along the score line 15, the pull tab 17 may be utilized in the tearing out of the removable panel portion 16 so as to completely open the can 10.

At this time it is' pointed out that the removable panel portion 16 may have advantageous configurations. For example, the central portion of the removable panelpor tion 16 may be in the form of a recessed panel 21 so as' to stiften the end unit. In a like manner, the removable panel portion 16 may be provided with a second score line 22 which is disposed adjacent the score line 15 and in concentric relation thereto. However, the score line 22 is of a lesser depth than the score line 15, as is clearly shown in FIGURE 2, and functions to absorb shock in the removable panel portion 16 which otherwise might result in the accidental rupture of the end panel 13 along the score line 15.

It will be readily apparent from FIGURES 2 and 4 that when the radially inner end of the pull tab 17 is lifted and the nose 20 is brought into engagement with the removable panel portion 16, there is a tendency to lift the rivet 18 inasmuch as the rivet 18 functions as the fulcrum. Any lifting force applied to the rivet 18 is, in turn, transmitted to the surrounding area of the removable panel portion 16. In accordance with this invention, it is proposed to utilize this highly stressed area of the removable panel portion 16 to form a vent opening in the end unit prior to the initial rupture of the end panel 13 along the score line 15.

Referring now to FIGURE 3, it will be seen that there is formed in the removable panel portion 16 immediately adjacent the rivet 18 a weakening or score line 23. rThe score line 23 has a central portion 24 which is arcuate in outline and which is disposed substantially concentric to the adjacent portion of the rivet 18. At this time it is pointed out that although the rivet 18 is illustrated as being circular in section, it may be of other section and the contour of the central portion of the score line 23 will be modified accordingly. The score line 23 also has reversely turned end portions 25 so that the score line 23 has an overall outline generally resembling a handle bar mustache.

The specific outline of the score line 23 has numerous advantages. In the iirst place, the specific coniiguration and position on the central portion 24 is such so as to facilitate an initial rupture of the end panel 13 therealong. It is to be understood that the strength of the end panel 13 along the central portion of the score line 23 in comparison to the stress applied thereto during the normal opening of the can is less than the strength of the end panel along the score line in comparison to the stress initially applied thereto by the nose of the pull tab 17. Thus, rupture will positively occur along the score line 23 in advance of further rupture along the score line 15. As a result, as is clearly illustrated in FIGURE 4, initial rupture of the end 4panel 13 is in the form of a vent opening 26 which occurs along the score line 23.

It is iirst to be noted that the pull tab 17 overlies the score line 23 and thereby prevents accidental rupture of the end panel 13 along the score line 23. Secondly, when the can is packed at a pressure greater than atmospheric pressure, it will be seen that the pull tab 17 prevents a direct blowing out of gases from within the can 10 while not preventing the desired venting of the can. Further, it will be readily apparent that since the vent opening 26 is in the form of a crack, minute particles, such as ground coffee, etc. will not escape through the vent opening 26 with the outwardly owing gases.

At this time it is pointed out that when the can 10 is packed at a pressure less than atmospheric pressure, the vent opening 26 will function to permit influx of air so as to equalize the pressure within the can 10 with the atmosphere prior to the rupture of the end panel 13 along the score line 15. In this manner the vent opening 26 functions to prevent implosion.

A further feature of the specific score line configuration is that by reversely turning the end portions 25 thereof, uncontrolled tearing or rupture of the end panel 13 is prevented. Furthermore, it is to be noted that the score line 23 facilitates the hinging of a part of the removable panel portion 16 during the initial opening of the can 10, as is shown in FIGURE 5. This hinging action is facilitated by the terminal ends of the end portions 25 being disposed in converging relation and generally directed to the point of engagement of the end panel 13 along the score line 15 by the nose of the pull tab 17.

At this time it is pointed out that although the pull tab 17 is illustrated as having a hinged connection with the rivet 18, it is to be understood that under certain circumstances, the pull tab 17 may be of a rigid construction with the necessary hinging action between the pull tab and the end panel being provided by the score line 23 upon the rupture of the end panel therealong.

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 construction of the end unit, without departing from'the spirit and scope of the invention, as defined by the appended claims.

I claim:

.1. A container panel of the type having a removable panel portion defined by a weakening line, a lever type pull tab overlying said removable panel portion, means permanently securing said pull tab to said removable panel portion with an end portion of said pull tab being positioned relative to said weakening line for applying a rupturing effecting force thereon when the opposite end of said pull tab is moved away from said container panel, said removable panel portion having an area thereof which is stressed during the initial movement of said pull tab while applying a force to said container panel along said weakening line, and a second weakening line disposed in said stressed area intermediate said first mentioned weakening line and the connection between said pull tab and said removable panel portion and having reversely turned end portions disposed in converging relation and extending generally towards `said first mentioned weakening line, the relative strength of said removable panel portion along said second weakening line in comparison to the stress applied thereto being less than the strength of said container panel along the lrst mentioned weakening line in comparison to the stress applied thereto whereby said container panel will first rupture along said second weakening line.

2. The container panel of claim 1 wherein said second weakening line extends primarily transversely of said pull tab and underlies and is protected by said pull tab.

3. A container panel of the type having a removable panel portion defined by a weakening line, a lever type pull tab overlying said removable panel portion, means permanently `securing said pull tab to said removable panel portion with an end portion of said pull tab being positioned relative to said weakening line for applying a rupturing effecting force thereon when the opposite end of said pull tab is moved away from said container panel, said removable panel portion having an area thereof which is stressed during the initial movement of said pull tab while applying a force to said container panel along said weakening line, and a second weakening line disposed in said lstressed area intermediate said first mentioned weakening line and the connection between said pull tab and said removable panel portion, the relative strength of said removable panel portion along said second weakening line in comparison to the stress applied thereto being less than the strength of said container panel along the first mentioned weakening line in comparison to the stress applied thereto whereby said container panel will first rupture along said second weakening line, the connection between said removable panel portion and said pull tab including a rivet of arcuate section, and at least a central portion of said second weakening line being in closely spaced concentric relation to an adjacent portion of said rivet.

4. The container of claim 3 wherein said second weakening line terminates in reversely turned end portions.

5. The container of claim 3 wherein said second weakening line terminates in end portions disposed in converging relation and extending generally towards that 3,485,410 5 6 portion of the rst mentioned weakening line aligned with tab is provided with an internal hinge generally aligned said pull tab. with said weakening line.

6. The container panel of claim 1 wherein said pull tab and said reversely turned end portions extend gener- References Clted ally towards that portion of the rst mentioned weaken- 5 UNITED STATES PATENTS i113 line aligned With Said pull tab- 3356270 1/1968 Khoury 220 54 7. The container panel of claim 1 wherein said pull 3,381,848 5/1968 Brown 220 54 tab is provided with an internal hinge generally aligned 3,404,801 10/1968 Silvr 22g-54 with said weakening line.

8. The container panel of claim 3 wherein said pull 10 GEORGE T. HALL, Primary Examiner

US3485410A 1968-01-05 1968-01-05 Pressure relief score Expired - Lifetime US3485410A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US69598068 true 1968-01-05 1968-01-05

Publications (1)

Publication Number Publication Date
US3485410A true US3485410A (en) 1969-12-23

Family

ID=24795228

Family Applications (1)

Application Number Title Priority Date Filing Date
US3485410A Expired - Lifetime US3485410A (en) 1968-01-05 1968-01-05 Pressure relief score

Country Status (4)

Country Link
US (1) US3485410A (en)
DE (1) DE1757630B2 (en)
FR (1) FR1580786A (en)
GB (1) GB1193556A (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3576272A (en) * 1969-06-30 1971-04-27 Procter & Gamble Score-line structure
US3643833A (en) * 1969-11-04 1972-02-22 Ermal C Fraze Easy opening container wall
US3874553A (en) * 1973-07-19 1975-04-01 Aluminum Co Of America Easy opening can end with embossed panel
US4257529A (en) * 1979-04-12 1981-03-24 National Steel Corporation Easy-open retained tab structure for beverage can
US4928845A (en) * 1987-10-19 1990-05-29 Doyle Michael J M End face with tear-off lip closure for pressurized container
US5011037A (en) * 1989-11-30 1991-04-30 Adolph Coors Company Container end member
US5688544A (en) * 1995-04-18 1997-11-18 Kraft Foods, Inc. Easy opening ventable closure for sealed particulate product package
US5738237A (en) * 1995-06-07 1998-04-14 Aluminum Company Of America Easy open container end, method of manufacture, and tooling
US5819973A (en) * 1996-12-31 1998-10-13 Traub, Sr.; John J. Beverage container lid having a lift tab for opening an aperture and vent hole
US20110056944A1 (en) * 2008-09-19 2011-03-10 Adriana Brizio Can for the extemporaneous preparation of beverages by extraction and/or infusion, provided with a safety lid
US20110056945A1 (en) * 2009-09-04 2011-03-10 Christopher Paul Ramsey Full aperture beverage end
US9181007B2 (en) 2013-03-12 2015-11-10 Rexam Beverage Can Company Beverage can end with vent port
US9714114B2 (en) 2013-11-08 2017-07-25 Crown Packaging Technology, Inc. Full aperture can end

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4043479A (en) * 1976-05-10 1977-08-23 The Continental Group, Inc. Front opening easy-opening end closure with vent
US4269333A (en) * 1977-08-08 1981-05-26 Asahi Malleablt Iron, Co., Ltd. Pinch valve for a closed container

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3366270A (en) * 1966-05-27 1968-01-30 Continental Can Co Pull tab for easy opening can end
US3381848A (en) * 1966-10-05 1968-05-07 Fraze Ermal C Easy-opening can end
US3404801A (en) * 1967-04-21 1968-10-08 Fraze Ermal C Easy-opening container wall with scoreline vent

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3366270A (en) * 1966-05-27 1968-01-30 Continental Can Co Pull tab for easy opening can end
US3381848A (en) * 1966-10-05 1968-05-07 Fraze Ermal C Easy-opening can end
US3404801A (en) * 1967-04-21 1968-10-08 Fraze Ermal C Easy-opening container wall with scoreline vent

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3576272A (en) * 1969-06-30 1971-04-27 Procter & Gamble Score-line structure
US3643833A (en) * 1969-11-04 1972-02-22 Ermal C Fraze Easy opening container wall
US3874553A (en) * 1973-07-19 1975-04-01 Aluminum Co Of America Easy opening can end with embossed panel
US4257529A (en) * 1979-04-12 1981-03-24 National Steel Corporation Easy-open retained tab structure for beverage can
US4928845A (en) * 1987-10-19 1990-05-29 Doyle Michael J M End face with tear-off lip closure for pressurized container
US5011037A (en) * 1989-11-30 1991-04-30 Adolph Coors Company Container end member
US5688544A (en) * 1995-04-18 1997-11-18 Kraft Foods, Inc. Easy opening ventable closure for sealed particulate product package
US5738237A (en) * 1995-06-07 1998-04-14 Aluminum Company Of America Easy open container end, method of manufacture, and tooling
US5819973A (en) * 1996-12-31 1998-10-13 Traub, Sr.; John J. Beverage container lid having a lift tab for opening an aperture and vent hole
US9259117B2 (en) * 2008-09-19 2016-02-16 Adriana Brizio Can for the extemporaneous preparation of beverages by extraction and/or infusion, provided with a safety lid
US20110056944A1 (en) * 2008-09-19 2011-03-10 Adriana Brizio Can for the extemporaneous preparation of beverages by extraction and/or infusion, provided with a safety lid
WO2011026900A1 (en) * 2009-09-04 2011-03-10 Crown Packaging Technology, Inc. Full aperture beverage can end
CN102625769A (en) * 2009-09-04 2012-08-01 皇冠包装技术公司 Full aperture beverage can end
US8939308B2 (en) 2009-09-04 2015-01-27 Crown Packaging Technology, Inc. Full aperture beverage end
EP2878547A1 (en) * 2009-09-04 2015-06-03 Crown Packaging Technology, Inc Full aperture beverage can end
CN102625769B (en) * 2009-09-04 2016-01-13 皇冠包装技术公司 Full aperture beverage can end
US20110056945A1 (en) * 2009-09-04 2011-03-10 Christopher Paul Ramsey Full aperture beverage end
US9181007B2 (en) 2013-03-12 2015-11-10 Rexam Beverage Can Company Beverage can end with vent port
US9714114B2 (en) 2013-11-08 2017-07-25 Crown Packaging Technology, Inc. Full aperture can end

Also Published As

Publication number Publication date Type
DE1757630B2 (en) 1976-06-16 application
FR1580786A (en) 1969-09-05 grant
DE1757630A1 (en) 1971-04-29 application
GB1193556A (en) 1970-06-03 application

Similar Documents

Publication Publication Date Title
US3217971A (en) Containers formed of flexible sheet material providing one or more tie-strips
US3410436A (en) Closure cap with venting means
US3362569A (en) Container closures with breakable openings
US2870935A (en) Container seal
US4930658A (en) Easy open can end and method of manufacture thereof
US3083858A (en) Tear type container closure
US4105133A (en) Container wall with rupturable weakening line
US4015744A (en) Easy-open ecology end
US5346087A (en) Reinforced beverage can end with push down gate
US3877604A (en) Easy open ecology end
US4266688A (en) Easy access tab for vacuum packed products
US3982657A (en) One piece container end member with an integral hinged opening tab portion
US5062542A (en) Easy-open and reclosable container
US4576306A (en) Closure for a container having vent and tethered means
US3951299A (en) Horse-shoe shaped vent score
US5819973A (en) Beverage container lid having a lift tab for opening an aperture and vent hole
US4524879A (en) Can end pour spout and pull tab construction
US3866782A (en) Composite closure
US4202462A (en) Containers having locking structure
US4880136A (en) Container closure
US2724536A (en) Container
US4664288A (en) Pressure venting closure cap for a container spout
US3856184A (en) Easy-opening container closure having a sliding tab
US4821912A (en) Reclosable self-opening can end
US4901892A (en) Tamper evident container closure