US PATENT SUBCLASS 299 / 58
.~.~ Machine follows cutter into opening formed thereby

Current as of: June, 1999
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299 /   HD   MINING OR IN SITU DISINTEGRATION OF HARD MATERIAL

29  DF  HARD MATERIAL DISINTEGRATING MACHINES {17}
55  DF  .~ Rotary cutter head with advance direction coincident to rotary axis {2}
58.~.~ Machine follows cutter into opening formed thereby {3}
59  DF  .~.~.~> Relatively driven cutters {1}
61  DF  .~.~.~> Radially adjustable cutting area
62  DF  .~.~.~> With percussive-type cutter

DEFINITION

Classification: 299/58

(under subclass 55) Apparatus in which the entire machine follows the cutting means into the opening being formed by the cutting means as the cutting progresses.

SEE OR SEARCH CLASS

175, Boring or Penetrating the Earth,

92+, for a tool drive prime mover that follows a cutter below ground in an earth boring operation.