(under the class definition) Apparatus comprising a tool shaft having sections which are joined together by means permitting relative movement transverse to the longitudinal axis thereof, as by pivoting, and a means which normally holds the two sections of shafting in their angular or bent condition and which may be rendered inoperable to permit the two shaft sections to assume in aligned position.
(1) Note. The releasable means is generally released by the engagement of the tool with the bottom of the borehole.
SEE OR SEARCH THIS CLASS, SUBCLASS:
74, for sectional guide or shaft having means to lock sections in angular relation while boring.
SEE OR SEARCH CLASS
285, Pipe Joints or Couplings,
118, for knuckle joints in pipes having actuating means to relatively move pipe sections.
