Drilling tool, a self-drilling rock bolt, a drill bit, an anchoring device for a self-drilling rock bolt, a shaft for a drilling tool and an end coupling for a drilling tool
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United States of America Patent
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Mar 26, 2013
Grant Date -
Apr 22, 2010
app pub date -
Oct 26, 2007
filing date -
Nov 15, 2006
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A drilling tool incorporating first and second ends, a shaft extending between the ends. The first end has a drill bit to penetrate rock. The drill bit and the shaft have complementary threads. The drill bit and the shaft comprise a relative rotation stop means that ensures that the drill bit remains loose during drilling in a first direction. The invention further relates to a self drilling rock bolt, a drill bit, drill shaft and shaft coupling, an anchoring device, and an end coupling per se.
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