US PATENT SUBCLASS 175 / 267
.~ Cutter element shifted by fluid pressure

Current as of: June, 1999
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175 /   HD   BORING OR PENETRATING THE EARTH

263  DF  CUTTER ELEMENT LATERALLY SHIFTABLE BELOW GROUND (E.G., EXPANSIBLE) {13}
267.~ Cutter element shifted by fluid pressure {2}
268  DF  .~.~> With dropped element
269  DF  .~.~> Fluid pressure acts against spring biased part

DEFINITION

Classification: 175/267

(under subclass 263) Apparatus in which the laterally movable cutter element is moved laterally by means of a fluid under pressure acting against the cutter element or a below ground part attached thereto.

(1) Note. Devices which have a specific description of a fluid jet acting directly on the cutter element to assist in moving it laterally have been classified in this subclass only when the nozzle or outlet for the fluid has been claimed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

99, and the search there noted for other pressure fluid operated devices.

SEE OR SEARCH CLASS

166, Wells,

55.8, for fluid pressure actuated, radially movable well pipe cutter and subclass 212 for fluid pressure actuated expanding anchor.