(under subclass 154) Method or apparatus wherein a means is utilized to positively advance the string or conduit through a bore or other excavation in the earth, usually by pushing or pulling said string or conduit.
SEE OR SEARCH CLASS
37, Excavating,
370, for mole plows.
166, Wells,
50, for a well with a lateral conduit which may have been inserted into a bore by pushing or pulling; subclass 71 for a well with a below-ground feature and an above-ground casing sinking means; and subclasses 77.1+ for above-ground apparatus for forcing tubing or cable into an existing well.
173, Tool Driving or Impacting,
141, for a tool drive means provided with an advance causing or controlling means. 175, Boring or Penetrating the Earth, appropriate subclass for means to form a bore including a means to feed a drill string, and particularly
22+, for subject matter relating to boring without earth removal in which a special provision is included for forming a cased bore as a part of the boring operation; and subclass 171 for an above-ground tool drive combined with a means to install a casing as part of the boring operation. See the class definition of Class 175 for the line between Class 405 and Class 175.
254, Implements or Apparatus for Applying Pushing or Pulling Force, appropriate subclass for pushing or pulling devices, particularly
29+, for pipe or rod jacks; and subclasses 134.3+ for wire or strand placing in which a pushing or pulling device is utilized.
