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CLADDING SHEETS

  • US 3,824,664 A
  • Filed: 12/11/1973
  • Issued: 07/23/1974
  • Est. Priority Date: 03/29/1972
  • Status: Expired due to Term
First Claim
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2. A method of bending a corrugated sheet according to claim 1, wherein the pressing of rib formations into the sheet comprises the steps of:

  • a. providing a first die member having a generally planar base, raised formations projecting from said base and spaced and contoured for general mating engagement with the wall surfaces within said cavities, and upstanding formations projecting from said base and extending between adjacent ones of said raised formations;

    b. causing said first die member to operatively engage said corrugated sheet on one side thereof such that spaced raised formations are inserted within said plurality of cavities and engage the inside walls thereof and such that said upstanding formations are in engagement with those corrugations having their apices nearest said axis;

    c. causing a second die member of geometric configuration complimentary to said first die member to operatively engage said corrugated sheet in exact opposing relationship to said first die member such that said sheet is sandwiched therebetween; and

    d. forcing said first and second die members toward mating engagement with one another with said corrugated sheet sandwiched therebetween such that said raised spaced formations and said upstanding formations impress said plurality of rib formation into said sheet.

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