Non cutting hole-shaping and thread-forming stainless screw and process with impact for driving in the same
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United States of America Patent
Stats
-
Aug 6, 2002
Grant Date -
N/A
app pub date -
Sep 24, 1997
filing date -
Dec 21, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hole-shaping and thread-forming screw (1) has a non-cutting hole-shaping end section (2) that ends in a point, a haft section (4) provided with a thread (3) and an engagement section (5). The non-cutting hole-shaping end section (2) tapers towards its end. The whole screw is made of a stainless material, in particular its end section (2). When the screw (1) is driven in, a hole is haped without cutting into the workpiece (7) and is then threaded by the screw (1) itself.
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