B - Operations – Transporting – 65 – D
Patent
B - Operations, Transporting
65
D
190/143, 113/41
B65D 17/34 (2006.01) B21D 19/12 (2006.01) B21D 51/00 (2006.01) B21D 51/26 (2006.01) B21D 51/38 (2006.01) B21D 51/44 (2006.01) B21D 53/00 (2006.01) B65D 17/32 (2006.01) B65D 41/32 (2006.01) B65D 43/26 (2006.01) B65D 51/22 (2006.01)
Patent
CA 1208145
IMPROVED PULL TAB FOR EASY OPEN CAN END AND METHOD OF MANUFACTURE THEREOF ABSTRACT OF THE DISCLOSURE An easy open can end having a retained tear strip extending diametrically partly across the can end defined by a score line, and a graspable pull tab adjacent and outside the open end of the score line. The pull tab is provided with a nose portion to initiate a tear along the score line upon lifting of the pull tab. The edges of the nose portion are curled into a cylindrical cross- sectional shape to provide a high beam strength and to rigidize the nose portion and to prevent failure by bend- ing before the tear strip is opened. A method for manu- facture of the pull tab includes forming at least one relief knotch in the peripheral edge of the pull tab blank at the nose end thereof, whereby to relieve compres- sive forces when the edge is curled, and curling the peripheral edge of the nose portion in successive steps to form an edge portion of continuous cylindrical cross- sectional shape.
450035
Kaminski Elton G.
Mceldowney Carl F.
Alcoa Inc.
Smart & Biggar
LandOfFree
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