Patent ID: 7341163
Filing Date: 2008-03-11
Classification: B21D,B65D

Abstract:
1. A one-piece sheet metal can shell having a vertical center axis and a curled peripheral crown adapted to be double-seamed to an end portion of a formed sheet metal can body, said shell comprising a circular center panel connected by a panel wall to an inner wall portion of a countersink having an outer wall portion and a generally U-shaped cross-sectional configuration, a chuckwall having a lower wall portion connected to said outer wall portion of said countersink and an upper wall portion connected to an inner wall portion of said crown, said upper wall portion of said chuckwall forming an angular break with said lower wall portion of said chuckwall, said upper wall portion of said chuckwall having opposite end points defining in axial cross-section with said center axis a first angle substantially greater than a second angle defined by opposite end points of said lower wall portion of said chuckwall in axial cross-section with said center axis, with said second angle being greater than ten degrees, said inner wall portion of said crown forming an angular junction with said upper wall portion of said chuckwall and extending from said junction at a third angle substantially less than said first angle in axial cross-section with said center axis, said upper wall portion of said chuckwall projecting substantially above said center panel and having a horizontal radial width from said junction to said break greater than a horizontal radial width of said countersink adjacent the bottom of said countersink between said inner and outer wall portions of said countersink, a radial width between said junction and said outer wall portion of said countersink adjacent the bottom of said countersink being greater than a radial width between said angular break and said inner wall portion of said countersink adjacent the bottom of said countersink, and a straight line distance between said opposite end points of said upper wall portion of said chuckwall also being greater than said horizontal radial width of said countersink adjacent the bottom of said countersink.