US PATENT SUBCLASS 299 / 61
.~.~.~ Radially adjustable cutting area

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  DF  .~.~ Machine follows cutter into opening formed thereby {3}
61.~.~.~ Radially adjustable cutting area

DEFINITION

Classification: 299/61

(under subclass 58) Apparatus in which means are provided to change the radius of the effective cutting area encircled by the cutter teeth.

SEE OR SEARCH CLASS

175, Boring or Penetrating the Earth,

202, for an above ground means to relatively move below ground earth boring tool elements and subclasses 263+ for an earth boring tool having a cutter element laterally shiftable below ground.