US PATENT SUBCLASS 175 / 22
.~ Drive point detached from shaft to form cased bore or with installation of casing

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

19  DF  BORING WITHOUT EARTH REMOVAL (I.E., COMPACTING EARTH FORMATION) {3}
22.~ Drive point detached from shaft to form cased bore or with installation of casing {1}
23  DF  .~.~> Drive point retracted through shaft or casing

DEFINITION

Classification: 175/22

(under subclass 19) Subject matter including a step or means for (1) separating a drive point from its shaft to permit the shaft to remain as a casing in the bore or (2) installing a separate casing as a part of the boring operation.

(1) Note. Processes of installing a casing including forming a well or hydraulic or earth engineering structure which include boring are excluded and well be found in classes 166 and 405 respectively.

(2) Note. The term "detached" as used in this title includes merely removing the drive point from its position adjacent the end of the shaft, as well as mechanically disconnecting the shaft and drive point.