Drill rod for percussion drilling
AssigneeSandvik AB
InventorLars-Gunnar Lundell
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Abstract
The present invention relates to a drill rod for percussion drilling machine comprising a rod or a sleeve-shaped element that is provided with a threaded portion for engagement with another correspondingly threaded drill rod element. In order to reduce the risk for pitting damage, the threaded portion is provided with a wear lining that is metallurgically bonded to the rod. The lining is made of a metallic material that is softer than the material of the element, the latter usually being steel.
Claims20
A force-transmitting element in percussion drill rod assemblies, comprising a cylindrical metal body including an integral thread, and a lining disposed on said thread, said lining comprising a metallic material softer than said thread, said lining being metallurgically bonded by melting the metallic material to said thread.
A force-transmitting element in percussion drill rod assemblies, comprising a cylindrical metal body including an integral thread, and a lining disposed on said thread, said lining comprising a metallic material softer than said thread, said lining being metallurgically bonded to said thread, said lining extending along only one flank of said thread.
A percussion drill rod assembly comprising a metal rod having an external thread, and a hollow metal sleeve having an internal thread secured to said external thread, said threads being in contact along only one set of opposing thread flanks, and a lining disposed on the contacting flank of one of said threads, said lining comprising a metallic material softer than said one thread and being metallurically bonded by melting the metallic material to said one thread.
Dependencies are inferred from the claim text.