(under the class definition) Apparatus in which the tool, tool shaft or housing is provided with a means which is adapted to expand laterally to engage the wall of the borehole or casing to resist or prevent the movement of the tool, tool shaft or housing or a portion thereof due to the action of gravity or a lifting force.
SEE OR SEARCH THIS CLASS, SUBCLASS:
81, for an anchor engaging side wall of inaccessible bore for shaft engaging guide.
98, for expansible means to anchor a below ground tool drive motor to a bore wall.
118, for feed anchor in earth wall being bored.
210, for a fluid or cuttings directing or receiving means engaging the bore entrance, said means being anchored to the bore wall. SEE OR SEARCH CLASS
166, Wells,
206+, and the search there noted for an expansible anchor or casing for wells.
