(under subclass 113) Apparatus in which a means is provided to anchor some part of the feed means into the wall which is being bored, whereby the anchor is adapted to directly resist the reactionary pull of the feeding force.
(1) Note. The "earth wall being bored", is defined as a generally flat surface, (i.e., the face of the earth or a substantially planar or curved section not exceeding 90 deg. of the side or bottom of a crevice or shaft) into which the bore is being formed, the anchor being usually located in the bore, or at some point closely adjacent the mouth of the bore.
SEE OR SEARCH THIS CLASS, SUBCLASS:
210, for cuttings directing or receiving means engaging bore entrance, anchored to bore wall.
