US PATENT SUBCLASS 175 / 75
.~ Normally curved guide or shaft

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

73  DF  MEANS TRAVELING WITH TOOL TO CONSTRAIN TOOL TO BORE ALONG CURVED PATH {3}
75.~ Normally curved guide or shaft

DEFINITION

Classification: 175/75

(under subclass 73) Apparatus wherein the means to cause the tool to bore a curved hole comprises a member to direct the tool or a shaft for driving the tool which has or is formed to assume a nonlinear shape in the direction of boring.

SEE OR SEARCH CLASS

464, Rotary Shafts, Gudgeons, Housings, and Flexible Couplings for Rotary Shafts, appropriate subclasses for flexible rotary shafting and shaft housings.