Sheet with alternate protrusions and recesses

Details Sheet with alternate protrusions and recesses Sheet with alternate protrusions and recesses

1971-03-17

1976-11-16

Curtis, Allen B.

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

428179, B32B 1500

Patent

active

039921620

ABSTRACT:
A sheet of material having a succession of spaced alternate protrusions and recesses, the walls of each such protrusion and recess being composed exclusively of non-rectangular elementary surfaces joining each other in an undulatory manner at the ridges of said protrusions and recesses along a single line having a plurality of points at which it changes direction to form a plurality of undulations and at each of which points border lines of at least four of said elementary surfaces converge, said surfaces being ruled in a direction extending from one ridge line to another, the sum of the angles formed on said surfaces between said border lines at each of said points being equal to 360.degree..

REFERENCES:
patent: 1847216 (1932-03-01), Hubbard
patent: 2177490 (1939-10-01), Kieffer
patent: 2896692 (1959-07-01), Villoresi
patent: 2912940 (1959-11-01), Baroni

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