US PATENT SUBCLASS 175 / 325.2
.~.~ Coupled between shaft sections or bit and shaft section

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

320  DF  WITH TOOL SHAFT DETAIL {4}
325.1  DF  .~ Shaft carried guide or protector {3}
325.2.~.~ Coupled between shaft sections or bit and shaft section {2}
325.3  DF  .~.~.~> With bore wall engaging means rotatable relative to shaft section (e.g., with bearings)
325.4  DF  .~.~.~> Having removable inserts

DEFINITION

Classification: 175/325.2

Coupled between shaft sections or bit and shaft section:

(under subclass 325.1) Apparatus where the guide or protecting means is (1) a discrete device connecting two axially spaced shaft sections or (2) a shaft section and a bit in which the tool shaft or portion is specifically adapted to hold the bore wall guide or protector means.