US PATENT SUBCLASS 166 / 120
.~.~ Anchor actuated by fluid pressure

Current as of: June, 1999
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166 /   HD   WELLS

179  DF  PACKERS OR PLUGS {17}
118  DF  .~ With expanding anchor {12}
120.~.~ Anchor actuated by fluid pressure {2}
121  DF  .~.~.~> Pressure transmitted by cup type packer or plug seal
122  DF  .~.~.~> Pressure transmitted by packer or plug expanded by confined fluid from central chamber, pump, or plunger

DEFINITION

Classification: 166/120

(under subclass 118) Devices in which the anchoring means is movable to set or inset position, all or part of the movement being due to fluid pressure.

(1) Note. The whole of the movement to operative locking position is usually due to the fluid pressure. Devices in which some of the movement to final locking position is due to some other motive power are classifiable here only if there is also some added modification of the device for the use of fluid pressure to move or tend to move the anchoring means. The added modification must be supplementary to the common placement of a packer and expanding anchor whereby the pressure of the fluid being blocked acts to increase the anchoring effect. See subclass 140 for devices so arranged that fluid pressure increases the anchoring action but having no special modification for this purpose.

(2) Note. Devices in which fluid pressure is used to release a latch so that some other means may move the anchoring means are not classified in this or indented subclasses. See subclass 136 for spring set anchors with latches released by fluid pressure.

(3) Note. The fluid pressure may be caused by movement of the device through or into a body of fluid.

SEE OR SEARCH THIS CLASS, SUBCLASS:

212, for expansible anchors actuated by fluid pressure, the anchors being not disclosed as associated with packers or plugs.

SEE OR SEARCH CLASS 175, Boring or Penetrating the Earth,

99, for earth boring apparatus in which a below ground motor is anchored to the bore wall by a support having fluid operated expansible anchor.