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US 6,269,672 B1Granted
Indentations to control metal curling
OwnerJoseph J. Schutzinventor
Life of this patent
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Abstract
A method of curling a first metal portion of a planar workpiece over a second cooperating curled workpiece by making indentations in the first metal portion on the inside surface of the portion to be curled by a machine punch. A hinge can be constructed with this improvement.
Claims6
A method of controlling the curling operation of two metal blank workpieces to form a hinge comprising:
- providing a first metal blank workpiece cut to a predetermined shape of a hinge receiver blank and having a portion with an inside surface adapted to be curled;
- indenting the inside surface of the first blank portion for curling with parallel grooves by a predetermined indenting procedure selected from the group consisting of punching, cutting and filing;
- providing a second metal blank workpiece having an axis portion;
- curling the axis portion;
- and
- curling the indented blank portion of the first metal blank workpiece by one of a curling device or a roll forming device substantially 360° over the curled axis portion of said axis portion containing blank workpiece;
- whereby the curled portion of the first metal blank workpiece is smoothly formed without cracks or irregular deformation to form said hinge.
4 more elements
Dependencies are inferred from the claim text.