Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Leif Nordfeldt0
Date of Patent
December 26, 2006
0Patent Application Number
107681720
Date Filed
February 2, 2004
0Patent Primary Examiner
Patent abstract
A connection rod (1) for rock drilling includes a first rod part (2) whidh has an external thread (4) provided at one end thereof, wherein the end of the rod opposite to the one end includes an end portion (6) which carries an internal thread (5), wherein the end portion (6) is joind to the first rod part (2) by friction welding and wherein the end portion (6) has been heat treated prior to being joined to the first rod part (2). The invention also relates to a method of producing such a connection rod.
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