US PATENT SUBCLASS 175 / 83
.~.~ With clutch means acting between shaft and guide

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

79  DF  TOOL SHAFT ADVANCED RELATIVE TO GUIDE INSERTABLE IN INACCESSIBLE HOLE TO CHANGE DIRECTION OF ADVANCE {3}
82  DF  .~ Guide carried by shaft to operative position {1}
83.~.~ With clutch means acting between shaft and guide

DEFINITION

Classification: 175/83

(under subclass 82) Apparatus in which the means changing the direction of advance and the tool shaft are provided with means for preventing their relative rotation which is manipulable, usually by relative longitudinal movement, to permit relative rotation therebetween.

(1) Note. A mere shearable pin or bolt or other frangible connector between the redirecting means and the tool is excluded and will be found in subclass 82.

SEE OR SEARCH CLASS

166, Wells,

237, for detents and clutches particularly adapted for use in wells.