Vibrator devices

A vibrator device comprising a rotor, said rotor having a cavity open at a peripheral region of the rotor and adapted to contain a body of fluid which is eccentric of the rotation axis of the rotor, a casing with a swept internal surface surrounding said rotor and extending over said peripheral region thereof, and means rotatably supporting and for driving said rotor about said rotation axis relative to said casing, said swept surface of the casing extending close to said peripheral rotor region to contain said body of fluid in said cavity and thus being contacted by said body of fluid and subject to the fluid pressure therein.

A vibrator device comprising a rotor defining a cavity adapted to contain a body of fluid which is eccentric of the rotation axis of the rotor, and a casing with a swept internal surface contacted by said body of fluid and surrounding the rotor which is mounted for rotation relative to the casing whereby on rotation of the rotor relative to the casing a vibratory force is transmitted to said swept internal surface of the casing directly by fluid pressure on that surface, and an out-of-balance mass the rotation of which produces said vibratory force transmitted by said fluid pressure comprises a piston mounted in the rotor so as to be free to move radially outwardly against the body of fluid, whereby an rotation of the rotor centrifugal force urging the piston radially outwardly is balanced by said fluid pressure.