CA1067841A - Edge protection for easy opening end closure - Google Patents
Edge protection for easy opening end closureInfo
- Publication number
- CA1067841A CA1067841A CA260,992A CA260992A CA1067841A CA 1067841 A CA1067841 A CA 1067841A CA 260992 A CA260992 A CA 260992A CA 1067841 A CA1067841 A CA 1067841A
- Authority
- CA
- Canada
- Prior art keywords
- score line
- panel
- band
- score
- end closure
- 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
Links
Landscapes
- Containers Opened By Tearing Frangible Portions (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An easy opening end closure is formed with annular, double folded band adjacent the chuck wall. A weakening line defining a removable panel portion is formed in the center segment of the fold so that the folded edges of the single band provide smooth protective surfaces on both the ledge and 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 folded band.
An easy opening end closure is formed with annular, double folded band adjacent the chuck wall. A weakening line defining a removable panel portion is formed in the center segment of the fold so that the folded edges of the single band provide smooth protective surfaces on both the ledge and 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 folded band.
Description
6~;~84~
The present invention relates to new and improved easy opening end closure of the full panel opening type and more particularly to the method of forming the same.
Full opening containers of the type to which the ; present inve~tion relates include an end closure of which the end panel is formed with a weakening line located closaly adjacent 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 ;~ 10 initial lifting thereof the nose of the tab ruptures 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 section 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 presents a hazard.
The edge on the removable portion is also sharp.
Folded end panels for edge protection are known in the art as, for example, Holk, U.S. Patent 3,848,557. How-ever, in the prior art, a fold band protects a single edge only and two bands are required to protect the edges of both the ledge and the removable panel. The requirement of two fold bands complicates the production process and increases the probability of rejection of the closure due to accidental fracture of the score line during fabrication.
By the present invention, it is proposed to provide a full opening easy-open end closure constructed and .~
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arranged so that the raw edges ahout the horizontal ledge and the removable panel are~protected after severance of the removable panel portion.
This is accomplished generally by an end closure having an annular, single double folded band formed in the end panel adjacent the end closure chuck wall and in which a weakening line is formed in the center segment of the fold, so that the folded edges of the band provide smooth surfaces which bound the opening and the removable flap after separation.
Tt is another object to provide a new and novel method for forming a full opening easy-open end closure constructed in the manner specified in the foregoing object.
This is accomplished by forming the annular folded band in stages and the weakening line is formed by scoring prior to the final fold steps.
With the above and other objects in view that will hereinafter appear, the nature of the invention will be more readily understood by reference to the following description, the appended claims and the several views illustrated in the accompanying drawings.
Figure 1 is a top plan view of a full opening easy-open end closure incorporating the easy opening structure of the present invention.
Figure 2 is a fragmentary cross-sectional view of an end panel illustrating a step in the formation of the end closure of Figure 1.
Figure 3 is a fragmentary cross-sectional view similar to Figure 2, illustrating another formation step.
Figure 4 is a fragmentary cross-sectional view similar to Figures 2 and 3, illustrating yet another formation step
The present invention relates to new and improved easy opening end closure of the full panel opening type and more particularly to the method of forming the same.
Full opening containers of the type to which the ; present inve~tion relates include an end closure of which the end panel is formed with a weakening line located closaly adjacent 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 ;~ 10 initial lifting thereof the nose of the tab ruptures 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 section 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 presents a hazard.
The edge on the removable portion is also sharp.
Folded end panels for edge protection are known in the art as, for example, Holk, U.S. Patent 3,848,557. How-ever, in the prior art, a fold band protects a single edge only and two bands are required to protect the edges of both the ledge and the removable panel. The requirement of two fold bands complicates the production process and increases the probability of rejection of the closure due to accidental fracture of the score line during fabrication.
By the present invention, it is proposed to provide a full opening easy-open end closure constructed and .~
G784~
arranged so that the raw edges ahout the horizontal ledge and the removable panel are~protected after severance of the removable panel portion.
This is accomplished generally by an end closure having an annular, single double folded band formed in the end panel adjacent the end closure chuck wall and in which a weakening line is formed in the center segment of the fold, so that the folded edges of the band provide smooth surfaces which bound the opening and the removable flap after separation.
Tt is another object to provide a new and novel method for forming a full opening easy-open end closure constructed in the manner specified in the foregoing object.
This is accomplished by forming the annular folded band in stages and the weakening line is formed by scoring prior to the final fold steps.
With the above and other objects in view that will hereinafter appear, the nature of the invention will be more readily understood by reference to the following description, the appended claims and the several views illustrated in the accompanying drawings.
Figure 1 is a top plan view of a full opening easy-open end closure incorporating the easy opening structure of the present invention.
Figure 2 is a fragmentary cross-sectional view of an end panel illustrating a step in the formation of the end closure of Figure 1.
Figure 3 is a fragmentary cross-sectional view similar to Figure 2, illustrating another formation step.
Figure 4 is a fragmentary cross-sectional view similar to Figures 2 and 3, illustrating yet another formation step
-2-Figure 5 is a fragmentary cross-sectional view taken substantially along line 4-4 of Figure 1.
Figure 6 is a fragmentary cross-sectional view similar to Figure 5, illustrating the tab being lifted to open the closure.
Figure 7 is a fragmentary corss-sectional view illustrating the portion of the end closure attached to the container after opening.
Figure 8 is a fragmentary cross-sectional vie~
illustrating the portion of the end closure removed from the container during opening.
In accordance with the present invention, there is provided an easy-open end closure comprising an end panel 1 and a pull tab 2.
The end panel 1 includes a substantially horizontally extending central panel 3 having at its periphery a chuck wall 4 which terminates in a horizontal flange 5 and a curled end 6. The central panel 3 is formed with an annular, double-folded band 7, radially inward of the chuck wall 4. ~s best seen in Figure 5, the band 7 comprises substantially planar upper, intermediate and lower segments 7a, 7b and 7c respectively and curved segments 7d and 7e, the curved segments 7d and 7e connecting the planar segments 7a, 7b and 7c in an S-shaped series with the planar segments being substantially parallel and in close contact. A score line 8 is formed in the intermediate segment 7b, in the side thereof toward the lower segment 7c, and encircles an open-ing flap 9. The portion of the central panel 3 radially out-ward of the score line 8 is commonly referred to as the ledge, while the portion radially inward thereof is known as the removable panel portion or closure portion.
The pull tab 2 is longitudinally rigid and comprises
Figure 6 is a fragmentary cross-sectional view similar to Figure 5, illustrating the tab being lifted to open the closure.
Figure 7 is a fragmentary corss-sectional view illustrating the portion of the end closure attached to the container after opening.
Figure 8 is a fragmentary cross-sectional vie~
illustrating the portion of the end closure removed from the container during opening.
In accordance with the present invention, there is provided an easy-open end closure comprising an end panel 1 and a pull tab 2.
The end panel 1 includes a substantially horizontally extending central panel 3 having at its periphery a chuck wall 4 which terminates in a horizontal flange 5 and a curled end 6. The central panel 3 is formed with an annular, double-folded band 7, radially inward of the chuck wall 4. ~s best seen in Figure 5, the band 7 comprises substantially planar upper, intermediate and lower segments 7a, 7b and 7c respectively and curved segments 7d and 7e, the curved segments 7d and 7e connecting the planar segments 7a, 7b and 7c in an S-shaped series with the planar segments being substantially parallel and in close contact. A score line 8 is formed in the intermediate segment 7b, in the side thereof toward the lower segment 7c, and encircles an open-ing flap 9. The portion of the central panel 3 radially out-ward of the score line 8 is commonly referred to as the ledge, while the portion radially inward thereof is known as the removable panel portion or closure portion.
The pull tab 2 is longitudinally rigid and comprises
-3-1~6'71~4i a nose portion, an intermediate portion and a lif~ portion 2a, 2b and 2c respectively. The tab 2 is attached ~o the end panel 1 by a rivet 11, integrally formed in the central panel 3 in the portion thereof radially inward of the score 8. The rivet shank lla passes through an opening 12 in the inter-mediate portion 2b with the rivet head llb pressing against the upper surface of the tab 2. A horse-shoe shaped slit 13 - is formed in the intermediate portion 2b encompassing the rivet 11 and opening toward the nose portion 2a. The nose portion 2a terminates in a substantially vertical end member 14 which engages the central panel 3 at a point 15 between the chuck wall 4 and the fold band 7. ;~
To open the closure, the lift portion of the tab 2 is displaced vertically, causing the tab 2 to pivot about the point of contact 15 between the end member 14 and the central panel 3 and impressing a downward force on the lower segment 7c and intermediate segment 7b of the fold band 7.
At the same, the intermediate portion 2b of the tab 2 is exerting an upward force on the rivet head llb at the point 16 thereon nearest the end member 14. This upward force is communicated to the upper segment 7a of the fold 7 through the rivet shank lla. The opposing forces thus placed on the intermediate segment 7b result in fracture of the score line 8 in the area immediately adjacent the end member 14. After fracture has been initiated, the tab 2 is pulled away from the end panel 1 in the conventional manner to effect controlled tearing of the remainder of the score 8 and removal of the flap 9.
As may be seen in Figures 7 and 8, the sharp edges created by the tearing of the score 8 are in shielded positions abutting the upper and lower segments 7a and 7b of the fold band 7. The flap 9 and the periphery of the opening in the
To open the closure, the lift portion of the tab 2 is displaced vertically, causing the tab 2 to pivot about the point of contact 15 between the end member 14 and the central panel 3 and impressing a downward force on the lower segment 7c and intermediate segment 7b of the fold band 7.
At the same, the intermediate portion 2b of the tab 2 is exerting an upward force on the rivet head llb at the point 16 thereon nearest the end member 14. This upward force is communicated to the upper segment 7a of the fold 7 through the rivet shank lla. The opposing forces thus placed on the intermediate segment 7b result in fracture of the score line 8 in the area immediately adjacent the end member 14. After fracture has been initiated, the tab 2 is pulled away from the end panel 1 in the conventional manner to effect controlled tearing of the remainder of the score 8 and removal of the flap 9.
As may be seen in Figures 7 and 8, the sharp edges created by the tearing of the score 8 are in shielded positions abutting the upper and lower segments 7a and 7b of the fold band 7. The flap 9 and the periphery of the opening in the
-4-71~4~
central panel 3 present the harmless turned smooth surfaces of the curved segments, 7d and 7e respectively, to the userand other`s coming into contact with the closure.
Referring to Figures 2, 3, 4 and 5 illustrating the stations for forming the end closure of the present invention, in Figure 2 there is illustrated a first station for forming the same. In this station, the end panel 1 has already been formed with a chuck wall 4, flange 5 and curl 6 by means well known in the art. In addition, the center of the central panel 3 has been upset to form a section 3a axially spaced from the remaining section 3b of the panel 3, the two sections 3a and 3b being joined by a connecting portion 3c having formed therein a score line 8. Although it is preferred that the connecting portion 3c be formed as a substantially horizontal ledge 3d and two substantially vertical members 3e and 3f, and that the score line 8 be located on the upper surface of the ledge 3d, it is to be understood that other connecting portion configura~ions and score locations therein are contemplated in the present invention. The end panel 1 rests on an anvil 21 which provides support for the flange
central panel 3 present the harmless turned smooth surfaces of the curved segments, 7d and 7e respectively, to the userand other`s coming into contact with the closure.
Referring to Figures 2, 3, 4 and 5 illustrating the stations for forming the end closure of the present invention, in Figure 2 there is illustrated a first station for forming the same. In this station, the end panel 1 has already been formed with a chuck wall 4, flange 5 and curl 6 by means well known in the art. In addition, the center of the central panel 3 has been upset to form a section 3a axially spaced from the remaining section 3b of the panel 3, the two sections 3a and 3b being joined by a connecting portion 3c having formed therein a score line 8. Although it is preferred that the connecting portion 3c be formed as a substantially horizontal ledge 3d and two substantially vertical members 3e and 3f, and that the score line 8 be located on the upper surface of the ledge 3d, it is to be understood that other connecting portion configura~ions and score locations therein are contemplated in the present invention. The end panel 1 rests on an anvil 21 which provides support for the flange
5 and chuck wall ~ and both sections 3a and 3b of the central panel 3. A punch 22 is provided which is configured to fit between the chuck wall 4 and the uppermost vertical member 3f of the connecting portion 3c.
In Figure 3, the punch 22 has been displaced vertically toward the anvil 21, thereby upsetting the connecting portion 3c such that the ledge 3d assumes a substantially vertical position. It is to be noted that the score line 8 is displaced radially inwardly during this operation. This reduction in the length of the score 8 results in the forces impressed thereon during the reforma-tion being primarily compressive rather than tensile. This 3L067~4~
avoidance of tensile loading prevents score fracture during the forming process.
In the second forming station, illustrated in Figure 4, there is provided a split anvil 41 and a split punch 42, each comprising a central movable portion 41a and 42a respectively and an outer fi~ed portion 41b and 42b respectively. The partially formed end closure from the first forming station is clampingly held between the fixed portions 41b and 42b of the punch 42 and the anvil 41. The movable portion 42a of the punch 42 is then displaced down-wardly, causing a corresponding downward movement of the movable portion 41a of the anvil 41. As the punch portion 42a descends, the connecting portion 3c collapses, rotating outwardly and downwardly about a point 43 at the juncture of the connecting portion 3c and the lower portion 3b of the central panel 3. As the punch 42 descends, the upper end 46 of the connecting portion 3c is forced against the moving face 45 of the anvil 41. It is to be noted that the anvil face 45 slopes upwardly and inwardly, allowing point 43 to 20 move radially inwardly during the rotation o~ the connect-ing portion 3c. Thus, the score line 8 is not substantially displaced radially, but is subjected to a primarily compressive loading during the reformation process. After the connecting portion 3c has been folded flat against the lower central panel portion 3b, the pull tab 2 is attached to the upper panel portion 3a with an integrally formed rivet 9 according to methods well known in the art.
In Figure 3, the punch 22 has been displaced vertically toward the anvil 21, thereby upsetting the connecting portion 3c such that the ledge 3d assumes a substantially vertical position. It is to be noted that the score line 8 is displaced radially inwardly during this operation. This reduction in the length of the score 8 results in the forces impressed thereon during the reforma-tion being primarily compressive rather than tensile. This 3L067~4~
avoidance of tensile loading prevents score fracture during the forming process.
In the second forming station, illustrated in Figure 4, there is provided a split anvil 41 and a split punch 42, each comprising a central movable portion 41a and 42a respectively and an outer fi~ed portion 41b and 42b respectively. The partially formed end closure from the first forming station is clampingly held between the fixed portions 41b and 42b of the punch 42 and the anvil 41. The movable portion 42a of the punch 42 is then displaced down-wardly, causing a corresponding downward movement of the movable portion 41a of the anvil 41. As the punch portion 42a descends, the connecting portion 3c collapses, rotating outwardly and downwardly about a point 43 at the juncture of the connecting portion 3c and the lower portion 3b of the central panel 3. As the punch 42 descends, the upper end 46 of the connecting portion 3c is forced against the moving face 45 of the anvil 41. It is to be noted that the anvil face 45 slopes upwardly and inwardly, allowing point 43 to 20 move radially inwardly during the rotation o~ the connect-ing portion 3c. Thus, the score line 8 is not substantially displaced radially, but is subjected to a primarily compressive loading during the reformation process. After the connecting portion 3c has been folded flat against the lower central panel portion 3b, the pull tab 2 is attached to the upper panel portion 3a with an integrally formed rivet 9 according to methods well known in the art.
-6-
Claims (12)
1. An easy opening container end closure having a ledge portion and a removable panel portion, a single band folded under said panel portion and over said ledge portion, and joined to respective portions by folds, and a fracturable score located in said band intermediate said folds, said folds presenting smooth turned surfaces on the ledge and the removable panel portion after said score is fractured and the panel portion removed.
2. An easy opening container end closure comprising a ledge portion, a closure portion, an intervening band connected to adjoining edges of both of said portions by folds, and a score line positioned in said band whereby turned smooth surfaces are presented along the edges of the closure portion and the ledge portion subsequent to fracture of said score line.
3. An easy opening container end closure comprising an end panel having a double folded band and a score line defining an opening flap, said score line being located in said band substantially equidistantly spaced from the folds of said double fold, whereby turned smooth surfaces are presented about the flap and about the opening in the end panel subsequent to fracture of said score line.
4. The invention of claim 3 and a pull tab attached to said opening flap for fracturing said score line to open said container.
5. The invention of claim 4, wherein said folded band is annular.
6. An easy opening end closure comprising an end panel having a folded band, and a score line defining an opening flap, said folded band comprising upper, intermediate and lower planar segments connected in S-shaped series by curved segments, said score line being located in said intermediate segment, whereby the edges of said end panel and said opening flap are bounded by said curved segments subsequent to fracture of said score line.
7. The invention of claim 6 and means for relatively displacing said upper and lower segments to effect fracture of said score line to open end closure.
8. The invention of claim 7, wherein said displacing means comprises a pull tab attached to said opening flap.
9. The invention of claim 8, wherein said pull tab comprises a nose portion, an intermediate portion and a lift portion, said pull tab being attached to said open-ing flap by means of a rivet passing through said inter-mediate portion, and a horse-shoe shaped slit formed in said intermediate portion encompassing said rivet, and opening toward said nose portion.
10. A method of producing an end closure for a can or similar container comprising the steps of:
providing an end panel including at least two axially offset sections joined by a connecting portion, forming a score line in said connecting portion, upsetting said connecting into vertically dis-placed upper and lower portions and a substantially vertical portion therebetween with the upper portion having said score therein, then aligning the upper portion with said vertical portion, and then collapsing said connecting portion panel-wardly whereby the same assumes a position substantially parallel to one of said sections.
providing an end panel including at least two axially offset sections joined by a connecting portion, forming a score line in said connecting portion, upsetting said connecting into vertically dis-placed upper and lower portions and a substantially vertical portion therebetween with the upper portion having said score therein, then aligning the upper portion with said vertical portion, and then collapsing said connecting portion panel-wardly whereby the same assumes a position substantially parallel to one of said sections.
11. The method of claim 10, wherein said con-necting portion includes a substantially horizontal ledge and said score line is formed in said ledge.
12. A method of producing an end closure for a can or similar container comprising the steps of:
providing an end panel including at least two axially offset sections joined by a connecting portion, forming a score line in said connecting portion, upsetting said connecting portion into a sub-stantially vertical position, and collapsing said connecting portion panelwardly whereby the same assumes a position substantially parallel to one of said sections, said score being displaced radially inwardly during said upsetting of said connecting portion, whereby the stress loading on the score residual is pri-marily compressive.
providing an end panel including at least two axially offset sections joined by a connecting portion, forming a score line in said connecting portion, upsetting said connecting portion into a sub-stantially vertical position, and collapsing said connecting portion panelwardly whereby the same assumes a position substantially parallel to one of said sections, said score being displaced radially inwardly during said upsetting of said connecting portion, whereby the stress loading on the score residual is pri-marily compressive.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US65741876A | 1976-02-12 | 1976-02-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1067841A true CA1067841A (en) | 1979-12-11 |
Family
ID=24637103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA260,992A Expired CA1067841A (en) | 1976-02-12 | 1976-09-09 | Edge protection for easy opening end closure |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1067841A (en) |
-
1976
- 1976-09-09 CA CA260,992A patent/CA1067841A/en not_active Expired
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