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US 6,233,989 B1Granted
Method and apparatus for stamping a metal sheet with an apertured design having rolled edges
AssigneeChanging Paradigms, LLC
InventorRaymond Z. Blinstrubas
Life of this patent
Estimating the term…
Abstract
A metal container lid having an apertured design with rolled edges is stamped by a method and apparatus incorporating a cushioning pad between a die and the metal sheet, which is then stamped with a perforating punch.
Claims17
A method for stamping a metal sheet with an apertured design comprising:
- providing a perforating punch and a die operable to mate with the punch and to stamp an apertured design through a metal sheet;
- placing a cushioning pad on the die;
- positioning the metal sheet between the cushioning pad and the punch;
- using the punch to cut through the metal sheet and pad to stamp the metal sheet with the apertured design and roll the metal edge of the apertured design.
1 more element
An apparatus for perforating a metal sheet comprising:
- a perforating punch operable to stamp an apertured design through a metal sheet;
- a die operable to mate with the perforating punch;
- a cushioning pad interposed between the mating surfaces of the die and the metal sheet for providing a rolled over edge of the apertured design through the metal sheet.
A metal container lid having an apertured design comprising a metal sheet having stamped therethrough an apertured design, said design having the edge rolled over to reinforce the lid and avoid a sharp cutting surface.
Dependencies are inferred from the claim text.