(under the class definition) Apparatus in which the tool drive means includes a mass which is driven about an axis, the axis of rotation being eccentric relative to the center of weight of the mass, said mass causing movement of an element which supports said axis of rotation when the center of weight of the mass reaches a certain position relative to the axis of rotation of the mass to drive the tool.
(1) Note. The element which supports the axis of rotation of the mass generally (1) is guided against movement in other than line movement, and moves when the center of weight of the mass substantially corresponds with the guided line, or
(2) supports a pair of masses rotating in opposite directions, and said element moves when the combined centers of weight of the masses are unbalanced.
SEE OR SEARCH CLASS
74, Machine Element or Mechanism,
61, for a mechanical movement including an unbalanced weight.
