Boring or penetrating the earth – With tool shaft detail
Reexamination Certificate
2007-02-27
2007-02-27
Neuder, William (Department: 3672)
Boring or penetrating the earth
With tool shaft detail
C411S900000, C029S525140, C076S108200
Reexamination Certificate
active
10505152
ABSTRACT:
A drill member for percussive rock drilling is formed by forming a compound component and friction welding the compound component to the end of a drill rod. The compound component is formed by welding a core part within a shell part and machining a thread into either the shell part (male thread) or core part (female thread). The part in which the thread is machined is formed of low alloy steel, and the other part is formed of stainless steel, wherein the thread bottom is formed of stainless steel, and the thread crests are formed of low alloy steel.
REFERENCES:
patent: 4366971 (1983-01-01), Lula
patent: 5056209 (1991-10-01), Ohashi et al.
patent: RE33901 (1992-04-01), Shinjo
patent: 5940951 (1999-08-01), Schulz et al.
patent: 6394190 (2002-05-01), Linden
patent: 6681875 (2004-01-01), Larsson et al.
patent: 6874986 (2005-04-01), Koppel et al.
patent: WO 92/107730 (1992-10-01), None
Drinker Biddle & Reath LLP
Neuder William
Sandvik Intellectual Property AB
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