STEPPED PUNCH
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United States of America Patent
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Issued Date -
Sep 8, 2016
app pub date -
Mar 6, 2015
filing date -
Mar 6, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A punch for forming a punched opening in a metal sheet having an elongated body with a first and second spaced apart ends. The first end is adapted to be held by a machine which, when activated, axially drives the body. The second end of the body includes an annular surface corresponding in shape and size to the punched opening as well as an extension which protrudes outwardly from and is surrounded by the annular surface. The extension has a length greater than the thickness of the sheet metal so that, as the punch is driven through the sheet metal, the extension forms a hole in the sheet metal smaller than the opening and thereafter the annular surface forms the opening of the desired size in the metal sheet.
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