Nittetsu Steel Drum Co., Ltd.

Kiyozi Tomikawa

Kazuo Kajiwara

Mitsuo Sasai

A method and apparatus for forming a drum seam. A tray-like end plate having a cylindrical portion forming an indented shape and an outward extending end plate flange formed by the edge of the cylindrical portion is fitted into the end of a cylindrical drum body having a body flange extending outward from the edge thereof perpendicular to the cylindrical axis of the body with the end plate flange overlapping and extending along and beyond the body flange. A seaming chuck having a cylindrical forming face is fitted into the tray-like end plate for holding the body and end plate together with the forming face of the seaming chuck against the inner surface of said cylindrical portion and rotated for rotating the drum body and end plate. The seaming chuck has a fillet on the end adjacent the position where the end plate flange extends from the cylindrical portion and an inclined surface extending from the forming face outwardly thereof. A seaming roll having a circumferential forming groove therein opening toward the forming face of said seaming chuck is pressed radially inwardly toward the forming face of the seaming chuck for engaging the flanges and bending them over for interlocking them and forming them into a seam. The inclined surface of the fillet supports the corners of the flanges where they are bent out of the drum body and the end plate.

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Tokyo, Japan

Kiyozi Tomikawa