Driver
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United States of America Patent
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-
N/A
Issued Date -
Jan 5, 2006
app pub date -
Dec 10, 2002
filing date -
Dec 21, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A driver or dogging element adapted to transfer torsion forces between a rotating outer tube (10) and a drill bit (1) of a down-the-hole hammer, wherein the dogging element (7) is made of a softer material than those parts (3, 4) of the drill bit (1) that co-act with the dogging element (7, 8).
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