Method and means of interlocking over-lapping sheet material

Details Method and means of interlocking over-lapping sheet material Method and means of interlocking over-lapping sheet material

B - Operations, Transporting

23

P

26/29

B23P 11/00 (2006.01) B21D 39/03 (2006.01) B23P 19/00 (2006.01)

Patent

CA 1199167

ABSTRACT OF THE DISCLOSURE A device for fastening superimposed sheets of metal or the like together by punching corresponding portions of the sheets into displaced positions relative to the adjacent areas of the sheets, then spreading one displaced portion of one sheet, under pressure, into interlocking engagement with the adjacent areas of the other sheet while retaining the corresponding displaced portion of the other sheet from spreading under the same pressure,

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