Flyweight vibrator designed as directional vibrator

Claim 1

A flyweight vibrator designed as a directional vibrator with the direction of oscillation being adjustable, comprising (a) a housing (10) (b) A first flyweight shaft (12), which (b 1 ) is mounted in the housing (10), (b 2 ) carries a first flyweight (16), (b 3 ) is connected to a first gear (18) and (b 4 ) is adapted to be driven by a motor, (c) a second flyweight shaft (22), which (c 1 ) is mounted in the housing (10) parallel to the first flyweight shaft (12), (c 2 ) carries a second flyweight (28) and (c 3 ) is connected to a second gear (30), (d) a first oscillating crank (32) pivotably mounted about the axis (33) of the first flyweight shaft (12), (e) a second oscillating crank (34) mounted for pivoting about the axis (36) of the second flyweight shaft (22), (f) a connecting rod (44) (f 1 ) which is coupled to the first and the second oscillating crank (32,34) at equal distances from the axes (33,36) of the associated flyweight shafts (12,22) and (f 2 ) the effective length of which is equal to the distance of these axes (33,36) from each other, (g) a first intermediate gear (54), which (g 1 ) is mounted for rotation on the first oscillating crank (32) at a distance from the axis (33) of the first flyweight shaft (12) and (g 2 ) meshes with the first gear (18), (h) a second intermediate gear (56), which (h 1 ) is mounted for rotation on the second oscillating crank (34) at a distance from the axis (36) of the second flyweight shaft (22) equal to the distance of the first intermediate gear (54) from the axis (33) of the first flyweight shaft (12), (h 2 ) meshes with the second gear (30) and (h 3 ) meshes with the first intermediate gear (54) and (i) a shifting mechanism (60) arranged to rotate the two oscillating cranks characterized in that (j) each of the oscillating cranks has a counterweight on the side opposite the intermediate gear and is individually mass-balanced thereby with respect to its pivotal axis, such that oscillations of the vibrator, even if they do not fall into the longitudinal direction of the oscillating cranks, do not exert any torque upon the oscillating cranks about the axes of the flyweight shafts.