Boring or penetrating the earth – With tool shaft detail
Reexamination Certificate
2005-03-24
2009-08-11
Thompson, Kenneth (Department: 3672)
Boring or penetrating the earth
With tool shaft detail
C076S108200
Reexamination Certificate
active
07571779
ABSTRACT:
A drill rod for percussive rock drilling includes a first rod part and an additional second rod part. The first rod part includes first and second ends, an inner duct, and an external thread disposed adjacent the first end, wherein the external thread is at least partly hardened by heat treatment. The additional rod part includes first and second ends, an inner duct, and an internally thread disposed adjacent the first end thereof, wherein the internal thread is at least partly hardened by heat treatment. The first ends of the respective first and second rod parts are threadedly secured to one another, and the second ends of the respective first and second rod parts are welded together to define a weld zone having a substantially martensitic structure. If there is further provided an intermediate hollow rod part, then the second ends of the respective first and second rod parts would be welded to respective ends of the intermediate hollow part to define weld zones having a substantially martensitic structure.
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Hedlund Ann-Cathrin
Larsson Kenneth
Drinker Biddle & Reath LLP
Sandvik Intellectual Property Aktiebolag
Thompson Kenneth
LandOfFree
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