Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
271 words
The method of forming a continuous annular scoreline (6) in the upper surface of a horizontally supported end closure member (2) having a central panel portion (2a), a chuck wall portion (2b), and a radius portion (2c) connecting said central panel and chuck wall portions, which comprises the steps of (a) arranging opposite the closure member a scoring die (8) having a single downwardly depending annular projection (8a) for forming an annular scoreline (6) between the radius and central panel portions of the end, thereby to define a removable portion within the closure member central panel portion, said projection including in cross-sectional profile (1) a central horizontal flat surface portion (8b) for forming the bottom wall of the scoreline (2) a convex outer wall surface portion (8c) diverging outwardly from one end of said bottom wall for forming the outer side wall of the scoreline, said central flat surface portion being tangent to the surface of said outer wall portion; and (3) a flat inner wall surface portion (8d) diverging outwardly from the other end of said bottom wall for forming the inner side wall of the scoreline, said inner wall surface portion being angularly arranged at an obtuse angle relative to said central flat surface portion; and (b) pressing said scoring die vertically into the upper surface of the closure member while horizontally supporting the lower surface of said closure member opposite said score die annular projection to form the scoreline between the central panel and radius portions of the member, whereby when the metal end is opened mechanically by a can opener, the formation of metal slivers is minimized.
Claim 2
Independent Claim
271 words
The method of forming a continuous annular scoreline (6) in the upper surface of a horizontally supported end closure member (2) having a central panel portion (2a), a chuck wall portion (2b), and a radius portion (2c) connecting said central panel and chuck wall portions, which comprises the steps of (a) arranging opposite the closure member a scoring die (8) having a single downwardly depending annular projection (8a) for forming an annular scoreline (6) between the radius and central panel portions of the end, thereby to define a removable portion within the closure member central panel portion, said projection including in cross-sectional profile (1) a central horizontal flat surface portion (8b) for forming the bottom wall of the scoreline (2) a convex outer wall surface portion (8c) diverging outwardly from one end of said bottom wall for forming the outer side wall of the scoreline, said central flat surface portion being tangent to the surface of said outer wall portion; and (3) a flat inner wall surface portion (8d) diverging outwardly from the other end of said bottom wall for forming the inner side wall of the scoreline, said inner wall surface portion being angularly arranged at an obtuse angle relative to said central flat surface portion; and (b) pressing said scoring die vertically into the upper surface of the closure member while horizontally supporting the lower surface of said closure member opposite said score die annular projection to form the scoreline between the central panel and radius portions of the member, whereby when the metal end is opened mechanically by a can opener, the formation of metal slivers is minimized.
Claim 3
Dependent Claim
46 words
The method as defined in claim 1, and further including the step of connecting the flange portion of the end closure member to the open end of a body wall member by a rolled seam connection, said body wall member including at least one fibrous layer.
Claim 4
Dependent Claim
61 words
The method as defined in claim 1, wherein the radius of said die outer wall surface portion is less than that of the radius portion of the end closure member, the center of the radius of said outer wall surface portion being adjacent the vertical line which also contains the center of the radius of the end closure member radius portion.