Thread joint for a drill string for percussive rock-drilling
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United States of America Patent
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Nov 29, 2011
Grant Date -
Jun 8, 2006
app pub date -
May 9, 2003
filing date -
May 22, 2002
priority date (Note) -
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Abstract
In percussion rock drilling a screw joint for a drill run or drill string including male and female screw threads (5, 9) on the elements (1, 2) are joined together to form a drill string. Within the screw joint the male thread (5) and the female thread (9) have a trapezoidal shape and a slight conical inclination.
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