Self-drilling screw
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United States of America Patent
Stats
-
Jan 30, 1996
Grant Date -
N/A
app pub date -
Jun 9, 1994
filing date -
Jun 9, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A self-drilling screw is provided which is suitable for use with both relatively thick metal plate and relatively thin metal sheet. The screw is formed from a blank 1 which includes a shank 2 extending between a head 3 and drilling tip 4. The shank 2, adjacent the head 3, is formed with a frusto-conical enlargement 8. A thread 10, when formed in shank 2, is extended into enlargement 8 so as to create a final part 11 of the thread which, in use of the screw with sheet metal 12, distorts the sheet metal such that it firmly locks onto the enlargement 8. A shallow recess 6 is provided in the underside of head 3 surrounding the frusto-conical enlargement 8.
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