CA1050416A - Score and tool for forming the score - Google Patents
Score and tool for forming the scoreInfo
- Publication number
- CA1050416A CA1050416A CA296,885A CA296885A CA1050416A CA 1050416 A CA1050416 A CA 1050416A CA 296885 A CA296885 A CA 296885A CA 1050416 A CA1050416 A CA 1050416A
- Authority
- CA
- Canada
- Prior art keywords
- ledge
- score
- base
- bottom wall
- scoring
- 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
- Closures For Containers (AREA)
- Containers Opened By Tearing Frangible Portions (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A score having improved anti-fracture character-istics formed by a score punch including inclined sides merging at a flat bottom face. At least one of the sides is formed with a horizontal ledge parallel to the flat scoring face and located in vertical spaced relation from the face.
A score having improved anti-fracture character-istics formed by a score punch including inclined sides merging at a flat bottom face. At least one of the sides is formed with a horizontal ledge parallel to the flat scoring face and located in vertical spaced relation from the face.
Description
~05(~4~6 The present in~ention relates to scoring of sheet metal to form a weakening line capable of being severed ~y a minimum force.
Weakening lines are used in containers for defining a removable panel section in the panel of the end closure.
These weakening lines are generally formed by scoring in a manner such that the sheet metal is crushed to a predeter-mined thickness. The crushed thickness remaining is generally designated as the residual. In easy opening container structures it is essential that the residual is maintained at a minimum to facilitate the manual opening of the con-tainer. At the same time the residual must be sufficiently strong so as to resist fracture during normal handling so that the container remains tightly sealed until opening.
These conditions have been difficult to achieve and in particular when the end closure is made from a rela-tive non-ductile material such as steel. Although it should be understood that care must also be taken to prevent inad-vertent fracture when the material is aluminum.
The fracture during normal handling is beli~ved to be caused by work hardening stresses or the like created during the scoring. Heretofore, it has been common practice to provide an additional score of lesser residual than the primary score. These lesser residual scores are known as anti-fracture scores and are not intended to provide a weakening line along which the end unit panel is to be severed.
The anti-fracture scores have been concentrically located in radially spaced relation to the primary score line.
The radial spacing of the anti~fracture score ~rom the primary score or weakening is not al~ays convenient and )4~6 frequently interferes with other structures which m~y be incorporated into the end unit.
sy the present invention there is provided a scoring punch for forming a score in a metal sheet, said scoring punch comprising a punch member having a base, a rib projecting from an intermediate portion of said base with said base having inoperative flat surfaces on oppo-site sides of said rib, said rib having a bottom wall, opposing side walls inclined directly from said base toward said bottom wall, and at least one of said side walls having a ledge intermediate the length thereof and spaced from said bottom wall and said base, said one side wall being in sloping relation to said base both above and below said ledge.
The above described score cross-section is accom-plished by a scoring tool shaped generally complementary to the score.
Figure 1 is a greatly enlarged fragmentary cross-sectional view of the scoring tools and the score formed thereby. -~
~igure 2 is a greatly enlarged photomicrograph of the score formed with the tooling having the structure shown ;
in Figure 1.
Figure 3 is a greatly enlarged fragmentary cross-sectional view of another embodiment of the invention.
As shown the scoring tool 10 of the present inven-tion comprises a punch 11 and an anvil 12~ The punch 11 -~
includes a projecting rib 13 having equilateral inclined sides 14 and 16 which taper toward a horizontally disposed ~-flat scoring face 17. The inclined side wall 14 includes a
Weakening lines are used in containers for defining a removable panel section in the panel of the end closure.
These weakening lines are generally formed by scoring in a manner such that the sheet metal is crushed to a predeter-mined thickness. The crushed thickness remaining is generally designated as the residual. In easy opening container structures it is essential that the residual is maintained at a minimum to facilitate the manual opening of the con-tainer. At the same time the residual must be sufficiently strong so as to resist fracture during normal handling so that the container remains tightly sealed until opening.
These conditions have been difficult to achieve and in particular when the end closure is made from a rela-tive non-ductile material such as steel. Although it should be understood that care must also be taken to prevent inad-vertent fracture when the material is aluminum.
The fracture during normal handling is beli~ved to be caused by work hardening stresses or the like created during the scoring. Heretofore, it has been common practice to provide an additional score of lesser residual than the primary score. These lesser residual scores are known as anti-fracture scores and are not intended to provide a weakening line along which the end unit panel is to be severed.
The anti-fracture scores have been concentrically located in radially spaced relation to the primary score line.
The radial spacing of the anti~fracture score ~rom the primary score or weakening is not al~ays convenient and )4~6 frequently interferes with other structures which m~y be incorporated into the end unit.
sy the present invention there is provided a scoring punch for forming a score in a metal sheet, said scoring punch comprising a punch member having a base, a rib projecting from an intermediate portion of said base with said base having inoperative flat surfaces on oppo-site sides of said rib, said rib having a bottom wall, opposing side walls inclined directly from said base toward said bottom wall, and at least one of said side walls having a ledge intermediate the length thereof and spaced from said bottom wall and said base, said one side wall being in sloping relation to said base both above and below said ledge.
The above described score cross-section is accom-plished by a scoring tool shaped generally complementary to the score.
Figure 1 is a greatly enlarged fragmentary cross-sectional view of the scoring tools and the score formed thereby. -~
~igure 2 is a greatly enlarged photomicrograph of the score formed with the tooling having the structure shown ;
in Figure 1.
Figure 3 is a greatly enlarged fragmentary cross-sectional view of another embodiment of the invention.
As shown the scoring tool 10 of the present inven-tion comprises a punch 11 and an anvil 12~ The punch 11 -~
includes a projecting rib 13 having equilateral inclined sides 14 and 16 which taper toward a horizontally disposed ~-flat scoring face 17. The inclined side wall 14 includes a
-2- -. ' :
~L0504~6 horizontal land or ledge 18 spaced intermediate the scoring face 17 and the base 19 of the rib 13. The land 18 divides the side wall into two offset and parallel side sections 14a and 14b.
The anvil 12 has a flat face 22 located opposite the punch 11 and is adapted to support the sheet metal which ma~
be in the form of an end closure thereon. The punch 11 and anvil 12 are mounted in a press for movement toward and away from each other between a closed and open position.
Upon movement to the closed position the rib 13 penetrates the surface of the sheet metal so as to score the sheet material by crushing and compressing the material to provide a residual which is of a thickness capable of being severed as bv means of a pushing or pulling force applied by a tab or the like. The outline of the score 13S
which is formed by the scoring tool 10 is generally comple-mentary to the outline of the latter.
For convenience the walls defining the score 13S are designated by the same reference characters as those on the walls of the sCQring rib 13 but with suffix S appended there~
to. The score 13S includes converging sides 16S and 14aS-14bS of which the latter are joined by a ledge 18S. The bottom of the scoxe has a face 17S.
It is to be noted that the residual "X" is of a depth capable of being easily severed. Also the land 18S
is spaced along the wall ~4S so that fracture does not occur along the line.
Figure 2 is a reproduction of a photomicrograph at lOOX magnification through a sheet of metal having a score made by the tooling of the structure shown in Figure l. It ~()504~
is to be noted that the displacement of th~ metal is such that sharp walls and corners are not always formed as shown in Fi~ure 1. However, the terms "parallel", "flat" and "inclined" as used herein are intended to define the struc~
ture of the score shown in the photomicrograph of Figur~ 2.
In the preferred form of the invention the included angle _ between the sides 14 and 16 is bet~Jeen about 30 to 90 preferably 50. The distance z across the width of flat 17 is preferably .002" and the distance ~ from the score face ~-or flat 17 is about .003". The width w of the land or ledge 18 is about .006".
The scoring tool with the above dimensions was used to score a continuous cast steel sheet having a th;ckness of about .0095". The steel sheet was scored with residuals of about .0018" residuals without fracture.
This was an improvement over the scores obtained with a conventional score tool having an angle of 50 between the side walls. Such conventional score tools were used with the same type o~ sheet steel and excessive fracturing oc-curred with residuals of about .0028". This is an increase of about .0010" in residual which may adversely affect the opening characteristics of the easy-opening container with which the score is intended to be used.
Referring now to Figure 3 there is shown another embodiment of the invention. As shown the scoring tool 110 includes a punch 111 and an anvil 12. A scoring rib 113 projects from the punch 111. A p~ir of inclined side walls 114 and 116 which taper toward a flat scoring face 117 are each formed with a ledge or land 118. The lands 118 divided -the respective side walls 114 and 116 into side wall sections ~o~
116a-116b and 114a-114b which are parallel to each other.
The punch 111 is forced into engagement with -the sheet metal disposed on the anvil 112 in the same manner as described in connection with the embodiment of Figure 1.
The rib 113 crushes the surface and forms a score 113S
including a bottom flat 117S and ~all sections 114aS and 114bS and 116aS and 116bS and ledges 118S. The led~es or lands 118S serve to displace additional material above the bottom face of the score during the scoring operation ~
thereby apparently to relieve same of the stress associated ~:
with the scoring operation.
This application is a division of Canadian Application Serial ~o. 186,585 filed November 23, 1973.
.
~L0504~6 horizontal land or ledge 18 spaced intermediate the scoring face 17 and the base 19 of the rib 13. The land 18 divides the side wall into two offset and parallel side sections 14a and 14b.
The anvil 12 has a flat face 22 located opposite the punch 11 and is adapted to support the sheet metal which ma~
be in the form of an end closure thereon. The punch 11 and anvil 12 are mounted in a press for movement toward and away from each other between a closed and open position.
Upon movement to the closed position the rib 13 penetrates the surface of the sheet metal so as to score the sheet material by crushing and compressing the material to provide a residual which is of a thickness capable of being severed as bv means of a pushing or pulling force applied by a tab or the like. The outline of the score 13S
which is formed by the scoring tool 10 is generally comple-mentary to the outline of the latter.
For convenience the walls defining the score 13S are designated by the same reference characters as those on the walls of the sCQring rib 13 but with suffix S appended there~
to. The score 13S includes converging sides 16S and 14aS-14bS of which the latter are joined by a ledge 18S. The bottom of the scoxe has a face 17S.
It is to be noted that the residual "X" is of a depth capable of being easily severed. Also the land 18S
is spaced along the wall ~4S so that fracture does not occur along the line.
Figure 2 is a reproduction of a photomicrograph at lOOX magnification through a sheet of metal having a score made by the tooling of the structure shown in Figure l. It ~()504~
is to be noted that the displacement of th~ metal is such that sharp walls and corners are not always formed as shown in Fi~ure 1. However, the terms "parallel", "flat" and "inclined" as used herein are intended to define the struc~
ture of the score shown in the photomicrograph of Figur~ 2.
In the preferred form of the invention the included angle _ between the sides 14 and 16 is bet~Jeen about 30 to 90 preferably 50. The distance z across the width of flat 17 is preferably .002" and the distance ~ from the score face ~-or flat 17 is about .003". The width w of the land or ledge 18 is about .006".
The scoring tool with the above dimensions was used to score a continuous cast steel sheet having a th;ckness of about .0095". The steel sheet was scored with residuals of about .0018" residuals without fracture.
This was an improvement over the scores obtained with a conventional score tool having an angle of 50 between the side walls. Such conventional score tools were used with the same type o~ sheet steel and excessive fracturing oc-curred with residuals of about .0028". This is an increase of about .0010" in residual which may adversely affect the opening characteristics of the easy-opening container with which the score is intended to be used.
Referring now to Figure 3 there is shown another embodiment of the invention. As shown the scoring tool 110 includes a punch 111 and an anvil 12. A scoring rib 113 projects from the punch 111. A p~ir of inclined side walls 114 and 116 which taper toward a flat scoring face 117 are each formed with a ledge or land 118. The lands 118 divided -the respective side walls 114 and 116 into side wall sections ~o~
116a-116b and 114a-114b which are parallel to each other.
The punch 111 is forced into engagement with -the sheet metal disposed on the anvil 112 in the same manner as described in connection with the embodiment of Figure 1.
The rib 113 crushes the surface and forms a score 113S
including a bottom flat 117S and ~all sections 114aS and 114bS and 116aS and 116bS and ledges 118S. The led~es or lands 118S serve to displace additional material above the bottom face of the score during the scoring operation ~
thereby apparently to relieve same of the stress associated ~:
with the scoring operation.
This application is a division of Canadian Application Serial ~o. 186,585 filed November 23, 1973.
.
Claims (10)
1. A scoring punch for forming a score in a metal sheet, said scoring punch comprising a punch member having a base, a rib projecting from an intermediate portion of said base with said base having inoperative flat surfaces on opposite sides of said rib, said rib having a bottom wall, opposing side walls inclined directly from said base toward said bottom wall, and at least one of said side walls having a ledge intermediate the length thereof and spaced from said bottom wall and said base, said one side wall being in sloping relation to said base both above and below said ledge.
2. The invention as defined in claim 1 wherein said side walls form an included angle of about 50°.
3. The invention as defined in claim 2 wherein said bottom wall is a width of about 0.002 inch.
4. The invention as defined in claim 3 wherein said ledge is vertically spaced from said bottom wall a distance of about 0.003 inch.
5. The invention as defined in claim 4 wherein said ledge is a width of about 0.006 inch.
6. The invention as defined in claim 1 wherein a ledge is provided on each of said walls intermediate the lengths thereof and spaced from said bottom wall and said base.
7. The invention of claim 6 wherein the incline of each of said side walls is the same above and below the respective ledge.
8. The invention of claim 1 wherein said ledge is substantially parallel to said base and said bottom wall.
9. The invention of claim 1 wherein said ledge has a width approximately 3 times the width of said bottom wall.
10. The invention of claim 1 wherein the incline of said one side wall is the same above and below said ledge.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US370903A US3898944A (en) | 1973-06-18 | 1973-06-18 | Score and tool for forming the score |
| CA186,585A CA1028205A (en) | 1973-06-18 | 1973-11-23 | Score and tool for forming the score |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1050416A true CA1050416A (en) | 1979-03-13 |
Family
ID=25667420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA296,885A Expired CA1050416A (en) | 1973-06-18 | 1978-02-15 | Score and tool for forming the score |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1050416A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114210792A (en) * | 2021-12-02 | 2022-03-22 | 西安航天发动机有限公司 | Mi-shaped diaphragm notching tool for liquid rocket engine |
-
1978
- 1978-02-15 CA CA296,885A patent/CA1050416A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114210792A (en) * | 2021-12-02 | 2022-03-22 | 西安航天发动机有限公司 | Mi-shaped diaphragm notching tool for liquid rocket engine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3794206A (en) | Frangible opening means for a container lid | |
| US5129541A (en) | Easy open ecology end for cans | |
| US4105133A (en) | Container wall with rupturable weakening line | |
| CA2121205A1 (en) | Easy-open container end | |
| US3946683A (en) | Tabless container opening device and method and tools for forming the same | |
| US4348464A (en) | Combination score tool and score anvil | |
| DK145152B (en) | CONTAINER OF METAL PLATE WITH AN OPENING FIELD AND PROCEDURE AND APPARATUS FOR ITS MANUFACTURING | |
| IL42852A (en) | Metal container closures | |
| US3406866A (en) | Container panel with antifracture score | |
| US4012935A (en) | Score and tool for forming the score | |
| US3997076A (en) | Tabless container opening device | |
| US3912114A (en) | Digitally openable container closure | |
| US4027612A (en) | Method for forming container scored metal flap areas | |
| US4818461A (en) | Method for scoring rigid plastic sheet material | |
| US3698590A (en) | Frangible elements in sheet material | |
| US3576272A (en) | Score-line structure | |
| US4877391A (en) | Apparatus for scoring rigid plastic sheet material | |
| DK149227B (en) | PRESSURE-RESISTANT END COVER FOR TASKS | |
| GB1348192A (en) | Sheet metal container closures | |
| CA1050416A (en) | Score and tool for forming the score | |
| US4258859A (en) | No-fin scored metal ends for containers | |
| CA1104429A (en) | Method for the making of can ends | |
| CA1040486A (en) | Process and apparatus for forming tearably detachable portion on sheet | |
| US3898944A (en) | Score and tool for forming the score | |
| US3938455A (en) | Method of forming and a construction for a digitally openable container closure |