(under the class definition) Apparatus including a means located outside the bore entrance which is adapted to remain relatively axially stationary and pilot or direct a tool or means actuating or supporting a tool, as the tool advances during the boring operation.
SEE OR SEARCH THIS CLASS, SUBCLASS:
7, for a guide base on a marine flow spaced from a buoyant support for the boring apparatus.
10, for a submersible vertically movable guide for boring means mounted on a buoyant support.
79+, and the search there noted for tool guides insertable in an inaccessible hole.
122, and the search there noted for means to feed a drive, said means generally combined with a guide means, or performing a guiding function.
135, for above ground means to impact an earth penetrating means which generally includes guide means for a hammer, and particularly subclasses 151+ for drop hammer guide means. SEE OR SEARCH CLASS
173, Tool Driving or Impacting, appropriate subclass for a means to drive or impact a tool which may include a means to
guide the tool or drive, and particularly
39+, for such means combined with means to adjust the position of the axis of tool advance.
384, Bearings, appropriate subclasses, and
7+, for linear bearings.
408, Cutting by Use of Rotating Axially Moving Tool,
72+, for a gauge block of guiding a drill of general utility into a workpiece.
