Drill rod and method of manufacture thereof

Boring or penetrating the earth – With tool shaft detail

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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.

REFERENCES:
patent: 3773359 (1973-11-01), Chance et al.
patent: 3784238 (1974-01-01), Chance et al.
patent: 4151018 (1979-04-01), Bolton
patent: 4625814 (1986-12-01), Helasuo et al.
patent: 5919578 (1999-07-01), Lundell
patent: 5988301 (1999-11-01), Lundell
patent: 6095266 (2000-08-01), Lundell
patent: 7182159 (2007-02-01), Linden
patent: 2006/0118340 (2006-06-01), Wahlstrom et al.
patent: 2026044 (1980-01-01), None
patent: WO 97/49520 (1997-12-01), None
patent: WO 01/42615 (2001-06-01), None

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Drill rod and method of manufacture thereof does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Drill rod and method of manufacture thereof, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Drill rod and method of manufacture thereof will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-4125981

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.