In-the-hole drill inner tube rod
AssigneeInco Limited
InventorGerald J. Potvin
Life of this patent
Estimating the term…
Abstract
A drill rod having an inner tube extending through the rod. The rod and the tube form a dead zone that reduces the time necesssary to compress air within the rod. By presenting a smaller internal cross-sectional flow area within the rod and, as a consequence throughout the drill string, the drill hammer disposed at the bottom of the hole will operate more efficiently.
Claims5
A drilling apparatus, the apparatus comprising a drill rod, means for attaching the rod to an adjacent member, a tube disposed within the drill rod briding the proximal and distal ends of the drill rod, an annular empty dead zone disposed between the internal wall of the drill rod and the external wall of the tube, and the rod including a substantially constant cross-sectional flow area therein.
In combination with a drill rod, the rod comprising an elongated cylindrical midsection, male threaded means affixed to one end of the midsection, female threaded means affixed to the opposed end of the midsection, a tube disposed within the midsection, an empty dead zone between the tube and the inner wall of the midsection, and the rod including a substantially constant cross-sectional flow area therein.
Dependencies are inferred from the claim text.