Drilling tool having frictionally rotatable drilling head
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United States of America Patent
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-
Jul 24, 1990
Grant Date -
N/A
app pub date -
May 31, 1989
filing date -
Jun 18, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A drilling tool is proposed which is preferably suitable for making apertures in concrete work or masonry is fissured rock. To avoid damaging an interchangeable conveying helix (4), the connection between the conveying helix (4) and drilling head (3) is made as a frictional-resistance connection (FIG. 2).
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Cited Art Landscape
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