Sheet steel strip, process and device for manufacturing lock...

Details Sheet steel strip, process and device for manufacturing lock... Sheet steel strip, process and device for manufacturing lock...

B - Operations, Transporting

21

C

B21C 37/12 (2006.01)

Patent

CA 2047747

(57) Abstract A sheet steel strip which is wound to form lock seam tubing with helical seams has a projecting edge flange (2) along one longit- udinal side and a closable channel (11) on the other longitudinal side, which slips onto the edge flange of the last turn during wind- ing. The height (h) of the edge flange (2) is reduced by crease zones (4, 17) in the edge flange (2) and in the free flange (12) of the chan- nel, which are formed by upsetting during closing.

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