| 摘要 |
<p>A method of seaming a preformed end closure to a preformed container body of a drum or the like for forming a seam of reduced radial projection relative to the sidewall of the container body. At the start of seaming the end closure is in driving engagement with a rotating chuck and flanges of the end closure and container body are in overlying relation. The skirt of the end closure is radially spaced from the sidewall of the chuck and driving engagement therebetween is effected in the annular curved connecting zone between the skirt and recessed transverse central portion of the end closure. The skirt flares from the central portion to the flange thereof and is preferably at least in part frustoconical or has an annular step. The sidewall of the container body is centered on the skirt of the end closure and is spaced a radial distance from the chuck sidewall substantially greater than the thickness of the sheet metal of the end closure of the skirt. Driving engagement in the connecting zone may be circumferentially continuous or defined by a plurality of circumferentially spaced axially inclined ribs in the connecting zone.</p> |
