(under subclass 79.1) Cutter tooth or tooth head in which a portion of the elements' supporting means is relatively movable and maintains the elements in two or more different relative positions whereby the area of the hard material engaged by the tool is selectively variable.
(1) Note. The elements may be moved from one relative position to another either while the tool is operative or idle.
SEE OR SEARCH THIS CLASS, SUBCLASS:
61, for a mining machine having a rotary cutter head with advance direction coincident to the rotary axis, the drive following the cutter into the opening formed thereby, in which the cutting area is radially adjustable.
71, for a mining machine having relatively movable cutters.
SEE OR SEARCH CLASS
175, Boring or Penetrating the Earth,
263+, for earth boring or penetrating tools which are expansible during operation, and subclass 382 for an earth boring or penetrating tool having an adjustable cutting element.
