Drill bit assembly for fluid-operated percussion drill tools
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United States of America Patent
Stats
-
Jul 12, 2011
Grant Date -
Sep 30, 2010
app pub date -
Jan 4, 2007
filing date -
Jan 4, 2006
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A drill bit assembly for fluid-operated percussion drill tools. The assembly comprises a percussion bit (1) having a head portion (3) formed with an axially extending stub shank (32). A drive bush (2) is releasably connectable to the bit head portion (3). Axially extending splines (35) on the drive bush (2) are slideably engageable with complementary splines (36) formed on a drive chuck (4) whereby rotational drive from the chuck (4) may be transmitted to the drive bush (2). The assembly further comprises engagement means on the chuck (4) adapted for connecting the chuck (4) to a drive means (5) of the fluid-operated percussion drill tool.
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