Device to drive a body that carries out a tumbling and rotating motion

A material treatment apparatus which comprises

• a stationarily positioned support member,
• a first shaft which is fixedly connected to said support member and extends away from said support member, said first shaft including a first pivot bearing at an end thereof remote from said support member,
• a body element which has first and second pairs of aligned pivot pins extending away from opposite sides thereof, said first and second pairs of pivot pins defining respective first and second rotation axes which are askew to one another,
• a first forked control gimbal connected between said first pivot bearing and said first pair of aligned pivot pins,
• a rotation member rotatably mounted on said support member, said rotation member having a center of rotation which is coaxial with said first shaft,
• a second shaft which has a longitudinal axis and which extends away from said support member in parallel with said first shaft, said second shaft being mounted so as to be rotated by said rotation member around said first shaft and also so as to be rotatable around said longitudinal axis thereof, said second shaft having a second pivot bearing at an end thereof remote from said support member,
• a second forked control gimbal connected between said second pivot bearing and said second pair of aligned pivot pins, and
• drive means for rotating said rotation member, thereby causing said second shaft to rotate about said first shaft, which in turn simultaneously causes said body element to move in a tumbling and rotating movement and said second shaft to rotate about its said longitudinal axis.