(under subclass 206) Devices in which the outwardly shiftable means is movable to or from the final position by means of the force exerted by the pressure of a fluid.
SEE OR SEARCH THIS CLASS, SUBCLASS:
55.8, for well pipe cutters which are moved radially outward by fluid pressure.
120+, for packers or plugs and expanding anchors actuated by fluid pressure.
187, for packers or plugs expanded by fluid from a central conduit, pump or plunger.
SEE OR SEARCH CLASS
83, Cutting, 180, for an expanding mandrel inside a hollow workpiece, subclass 191 for an active cutter inside hollow workpiece, and subclasses 639.1+ for a fluid-pressure actuated reciprocatable cutting tool.
175, Boring or Penetrating the Earth,
99, for a below ground drive motor for an earth boring apparatus which is anchored to the bore wall by a fluid operated expansible anchor, and subclasses 267+ for laterally shiftable cutter elements which are shifted by fluid pressure.
