Patent ID: 8915313

Claim:
A hole boring tool having an axis of rotation, comprising: an inverted hollow cone having inner and outer surfaces, an axial tip located at a lower, soil penetrating portion of the tool, and an upper terminus; a drive frame attached to said upper terminus of said inverted hollow cone, comprising: a lower portion having two vertical side plates with upper and lower ends, the lower ends of said vertical side plates connected to opposing sides of said cone upper terminus, a horizontal plate connecting the upper ends of said side plates, with an axial hole in said horizontal plate, and a hollow outer shaft having upper and lower ends and an inner diameter, the lower end of said hollow outer shaft being connected to the upper surface of said horizontal plate, and said inner diameter communicating with said axial hole in said horizontal plate; an axial inner shaft having upper and lower ends, the lower end pivotally and centrally disposed within the tip of the inner surface of said cone, extending axially through said drive frame and hollow outer shaft, and having upper and lower pivot arms attached to a lower portion of said inner shaft within said drive frame; at least one laterally extendable blade assembly having a pivot end and a cutting end, the pivot end pivotally attached between said upper and lower pivot arms; and an indexing assembly, comprising: a pilot plate having upper and lower surfaces, an indexing plate having upper and lower surfaces, disposed axially adjacent to said pilot plate, and locking means which coact with said pilot plate and said indexing plate to control relative axial rotation between them, wherein the lower surface of one of said plates of said indexing assembly is connected to the upper end of said inner shaft, and the lower surface of the other of said plates of said indexing assembly is connected to the upper end of said hollow outer shaft such that the inner diameter thereof communicates with an axial hole in the plate connected thereto, said plates being rotatably moveable relative to each other on the axis of rotation.