B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
113/79
B21D 39/03 (2006.01)
Patent
CA 1169302
A B S T R A C T A joint between the overlapped ends of two metal strips comprising strip portions defined by parallel straight longitudinal slits cut through the thickness of both strips, adjacent strip portions being deflected in opposite directions to define a transverse passage and a lock pin located in said passage is characterised in that the said s-trip portions are pressed into essentially arcuate curvature and the maximum deflection of each strip portion is no more than about 15% of the length of the slits at its longitudinal edges. Apparatus for forming the joint comprises a pair of parallel cutter bars arranged on opposite sides of the path of the metal strip carried by supports, provided with means for moving said cutter bars towards and away from each other, each cutter bar carrying a plurality of laterally spaced cutter elements, the space between adjacent cutter elements on each cutter bar being substantially equal to the thickness of width of the cutter elements on the other cutter bar, this cutter elements on each cutter bar being arranged to mesh with the cutter elements on the other cutter bar, each cutter element having a-t least a particular periphery, each cutter bar being rotatable in relation to its support between a series of positions and being provided with means for holding it against rotation in a plurality of positions, Some at least of the cutters are provided with arcuate recesses in their periphery. When these recesses are indexed to face the opposed cutter bar, such cutters are rendered inoperative.
381768
Alcan International Limited
Fetherstonhaugh & Co.
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