Tool driving or impacting – Automatic control of power operated means
Reexamination Certificate
2006-10-03
2006-10-03
Bagnell, David (Department: 3672)
Tool driving or impacting
Automatic control of power operated means
C173S112000, C175S025000
Reexamination Certificate
active
07114576
ABSTRACT:
The rock drill apparatus (1) comprises a rock drill machine (6) provided with a percussion device (4), a feed device (9) and a tool (7), the tool (7) end comprising a bit (8) for breaking rock. The tool (7) is arranged to transmit impact energy generated by the percussion device (4) as a compression stress wave to the bit. The feed device (9) is arranged to thrust the tool (7) and the bit (8) against the rock to be drilled, whereby on drilling at least part of the compression stress wave generated by the percussion device (4) to the tool (7) reflects from the rock to be drilled back to the tool (7) as tensile stress, and impact energy of the percussion device (4) is adjusted on the basis of the level of tensile stress (σv) reflecting from the rock.
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Bagnell David
Drinker Biddle & Reath LLP
Sandvik Tamrock Oy
Stephenson David
LandOfFree
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