Rock drill product and method

Details Rock drill product and method Rock drill product and method

2005-12-27

2005-12-27

Neuder, William (Department: 3672)

Boring or penetrating the earth

With tool shaft detail

C411S389000

Reexamination Certificate

active

06978852

ABSTRACT:
A threaded rock drill element for percussive rock drilling includes a body forming a center axis and having a hardened thread. The thread includes thread crests and thread bottoms and a hardened zone having increased hardness. The hardened zone includes first and second hardened areas extending radially from a crest and bottom (valley), respectively, of the thread, to a boundary curve of the hardened zone. The boundary curve has convex portions extending along the thread crests, and concave portions extending along the thread bottoms.

REFERENCES:
patent: 3547715 (1970-12-01), Rossander
patent: 5700120 (1997-12-01), Manning et al.
patent: 01/38685 (2001-05-01), None

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