Mining or in situ disintegration of hard material – Cutter tooth or tooth head – Wear shield or replaceable wear sleeve
Reexamination Certificate
2006-08-11
2008-08-19
Kreck, John (Department: 3672)
Mining or in situ disintegration of hard material
Cutter tooth or tooth head
Wear shield or replaceable wear sleeve
C299S107000
Reexamination Certificate
active
07413256
ABSTRACT:
In one aspect of the invention, a degradation assembly has an attack tool with a body and a shank, the body having a wear-resistant tip. The shank is disposed within a bore of a holder secured to a driving mechanism. A washer is positioned in-between the attack tool and the holder and fitted around the shank of the attack tool, wherein an outer edge of the washer has a hardness greater than 58 HRc.
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Crockett Ronald
Hall David R.
Jepson Jeff
Kreck John
Miskin Benjamin T.
Wilke Tyson J.
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