Drill rod for percussion drilling
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United States of America Patent
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-
Nov 12, 1991
Issued Date -
N/A
app pub date -
Jul 25, 1989
filing date -
Oct 15, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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Cited Art Landscape
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