Boring or penetrating the earth – Bit or bit element – Impact or percussion type
Reexamination Certificate
2007-03-06
2007-03-06
Gay, Jennifer H. (Department: 3672)
Boring or penetrating the earth
Bit or bit element
Impact or percussion type
C166S380000, C166S242600, C175S395000, C403S343000, C403S348000
Reexamination Certificate
active
10603653
ABSTRACT:
A male portion for percussive rock drilling includes sections of reduced cross-sectional area. At least one thread for percussive rock drilling is provided at an end of the male portion. The end of the male portion comprises an abutment surface for the transfer of impact waves. The length of the portion is defined as the length of an imaginary cylinder from a plane of the impact surface to a point where the plane ceases to contact a crest of the thread, wherein the length divided by the external diameter of the cylinder lies within a range of 1–2.
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PCT International Search Report dated Aug. 29, 2003.
Brungs Anders
Carlström Bo
Liljebrand Per-Olof
Lundberg Christer
Drinker Biddle & Reath LLP
Gay Jennifer H.
Sandvik Intellectual Property AB
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