Mining or in situ disintegration of hard material – Hard material disintegrating machines – Rotary cutter head with advance direction coincident or...
Patent
1993-07-26
1994-05-03
Bagnell, David J.
Mining or in situ disintegration of hard material
Hard material disintegrating machines
Rotary cutter head with advance direction coincident or...
175384, 299 90, E21B 1020, E21D 910
Patent
active
053081501
ABSTRACT:
A down reaming apparatus including a cutterhead body and a plurality of arms radially disposed on the cutterhead body with cutter assemblies on each arm. A first arm has a given length and additional arms each are of different length. Arm extenders having cutter assemblies are attached to each arm such that the combined length of each of the arms and attached arm extender is substantially equal. Spacers are attached to at least one of the arms to increase the diameter of the cutterhead in conjunction with the relocation of each of the arm extenders.
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Bagnell David J.
The Robbins Company
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