Variable force oscillator

Claim 1

AN OSCILLATOR FOR PRODUCING A VIBRATORY FORCE COMPRISING A HOUSING, A FIRST SHAFT ROTATABLY MOUNTED IN SAID HOUSING, A FIRST PAIR OF ECCENTRIC WEIGHTS MOUNTED ON SAID FIRST SHAFT, SAID WEIGHTS BEING OF SUBSTANTIALLY THE SAME SIZE AND WEIGHT, MEANS FOR FIXEDLY CONNECTING A FIRST WEIGHT OF SAID WEIGHTS TO SAID SHAFT, MEANS FOR ROTATABLY MOUNTING THE SECOND WEIGHT ON SAID SHAFT, A SECOND SHAFT ROTATABLY MOUNTED IN SAID HOUSING PARALLEL TO THE FIRST SHAFT, A SECOND PAIR OF ECCENTRIC WEIGHTS MOUNTED ON SAID SECOND SHAFT, SAID SECOND WEIGHTS BEING OF SUBSTANTIALLY THE SAME SIZE AND WEIGHT, A CAM MEMBER COAXIAL WITH SAID SECOND SHAFT AND AT LEAST PARTIALLY ENCIRCLING SAID SECOND SHAFT, MEANS FOR FIXEDLY CONNECTING A FIRST WEIGHT OF SAID SECOND PAIR OF WEIGHTS TO THE CAM MEMBER, MEANS FOR FIXEDLY CONNECTING THE OTHER WEIGHT OF SAID SECOND PAIR TO THE SECOND SHAFT, SAID SECOND SHAFT AND SAID OTHER WEIGHT BEING AT LEAST PARTIALLY ROTATABLE RELATIVE TO THE CAM MEMBER AND ITS ATTACHED WEIGHT, THE FIRST WEIGHTS ON EACH SHAFT BEING PAIRED WITH EACH OTHER AND THE SECOND WEIGHTS ON EACH SHAFT BEING PAIRED WITH EACH OTHER SO THAT A DESIRED PHASE RELATIONSHIP BETWEEN SAID WEIGHTS EXISTS, MEANS FOR ROTATING THE FIRST SHAFT IN ONE DIRECTION, GEARING MEANS FOR ROTATING THE SECOND SHAFT BY SAID FIRST SHAFT IN AN OPPOSITE DIRECTION, AND MEANS INCLUDING THE CAM MEMBER, FOR VARYING THE PHASE RELATIONSHIP OF THE SECOND WEIGHT ON EACH SHAFT WITH RESPECT TO THE FIRST WEIGHT ON EACH SHAFT WHILE THE SHAFTS ARE ROTATING, SAID MEANS CAUSING THE SECOND WEIGHT ON EACH SHAFT TO BE REVOLVED WITH RESPECT TO THE FIRST WEIGHT THUS VARYING THE PHASE RELATIONSHIP BETWEEN THE FIRST AND SECOND WEIGHTS ON EACH SHAFT.