초록 ▼

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 en

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.

대표청구항 ▼

A stackable preformed end closure adapted to be seamed to a container body, comprising a recessed transverse central portion, a skirt extending axially and radially from said central portion, an annular concave connecting zone joining said central portion to said skirt, a flange extending radially o

A stackable preformed end closure adapted to be seamed to a container body, comprising a recessed transverse central portion, a skirt extending axially and radially from said central portion, an annular concave connecting zone joining said central portion to said skirt, a flange extending radially outwardly from said skirt axially remote from said central portion, a plurality of inwardly protruding hollow boss means formed in said concave connecting zone and adapted to engage a corresponding connecting zone of a seaming chuck for driving the end closure in rotation with the chuck, said boss means also being engageable with the convex side of the connecting zone of an identical subjacent end closure in nesting relation therewith so that the flanges of said first mentioned end closure and the subjacent end closure are axially spaced from each other to facilitate separation and handling.