Boring or penetrating the earth – Bit or bit element – Impact or percussion type
Reexamination Certificate
2011-07-12
2011-07-12
Gay, Jennifer H (Department: 3676)
Boring or penetrating the earth
Bit or bit element
Impact or percussion type
C175S306000, C166S237000, C173S132000
Reexamination Certificate
active
07975784
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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Gay Jennifer H
Kusner & Jaffe
Minroc Technical Promotions Limited
LandOfFree
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