(under the class definition) Apparatus adapted to perform functions other than earth boring or to perform an earth boring function in a different manner in response to (1) removal of a significant portion of the apparatus and/or (2) installation of additional parts or (3) by substantial rearrangement of the existing parts.
(1) Note. Many patents in this art disclose substituting one form of tool reciprocating device for another type. Such structure has been excluded as not performing an earth boring function in a different manner for the purpose of this definition and will be found below.
(2) Note. Merely rendering parts (which are present in the apparatus) operative or inoperative by a manual adjustment or by actuation of a control mechanism (e.g., clutch) have been excluded as not constituting a substantial rearrangement of existing parts for the purpose of this subclass.
(3) Note. Merely replacing one type of earth boring tool or cutter element with a different type of earth boring tool or cutter element has been excluded since it is common in this art to interchange tools depending on the type of formation encountered. However, substituting a tool or element which has no earth boring function for an earth boring tool has been included.
(4) Note. The change in the apparatus must include more than merely adjusting or reversing a part which has no material effect on the overall functioning of the apparatus. Such structure is classified below as indicated by the search notes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
114, for a device in which a common prime movement feeds and rotates a tool, and in which an adjustment, may be effected to provide an independent feed or rotation of the tool. 382+, and the search there noted for a cutter element which is adjustable relative to a bit head.
386, for a bit having a pilot portion which is used only at
the initial stages of the boring operation and which is removed after the bore has been started.
SEE OR SEARCH CLASS
254, Implements or Apparatus for Applying Pushing or Pulling Force,
29+, for means for pulling stuck pipes or rods otherwise than by impact.
