PUNCH AND RELATED RECESSED SCREW
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United States of America Patent
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Issued Date -
Mar 12, 2009
app pub date -
Sep 7, 2007
filing date -
Sep 7, 2007
priority date (Note) -
Abandoned
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Abstract
The present invention pertains to a punch for forming recessed screw comprising a punch body and a punch head. Particularly, the punch head includes two square portions having different heights and square sides and intersecting at an included angle, thereby punching the corresponding tiers of recesses in the socket of the screw head. In this manner, the screw can be facilely driven by a screwdriver presenting a square configuration or a uniform shape as the punch, which facilitates to reduce the problem of unfitted driving tool and increase the convenience while in operation.
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