Phillip W Arnold

US Patent:

20040206152, Oct 21, 2004

Filed:

Mar 3, 2004

Appl. No.:

10/795077

Inventors:

Max Durney - San Francisco CA, US
Phillip Arnold - Redwood City CA, US

International Classification:

B21B005/00

US Classification:

072/379200

Abstract:

A method of preparing a sheet of material for bending along a bend line comprising the step of forming of at least one displacement in the thickness direction of the sheet of material with a portion of the periphery of the displacement closest to the bend line providing an edge and opposed face configured in position to produce edge-to-face engagement of the sheet on opposite sides of the periphery during bending. The forming step is preferably accomplished using one of a stamping process, a punching process, a roll-forming process and an embossing process. A sheet of material suitable for bending using the process also is disclosed, as are the use of coatings, shin guards and displacing the area of the sheet between bending inducing slits.