(under the class definition) Process or apparatus comprising a step or means for driving the boring tool which includes a mass or weight mounted to travel in an orbital path with the center of gravity of the mass or weight being spaced from the center of the path in which it travels, the reaction of said mass or weight on its mounting being transmitted to the boring tool through the means mounting the mass or weight for rotation.
SEE OR SEARCH CLASS
74, Machine Element or Mechanism,
61, for mechanical movements for converting rotary motion to or from reciprocating or oscillating motion by means of unbalanced weights.
173, Tool Driving or Impacting,
49, for a tool driving or impacting device actuated by a
means reacting to the rotation of an eccentric mass. 209, Classifying, Separating, and Assorting Solids,
367, for actuating devices for reciprocating sifters having unbalanced weights.
