| 摘要 |
In a vibrator unit for driving a penetrating element (16), such as a pile tube, two weights (10A, 10B) of equal sizes are put in synchronous motion in opposite directions each along one of two uniform and mutually parallel or bits located on opposite sides of and at equal distances from an axis (2) coinciding with the longitudinal axis of the element (16) in such manner that the weights (10A, 10B) always simultaneously cross a plane of symmetry of the two orbits coinciding with said axis (2) and between these crossings are on opposite sides of said plane of symmetry. The speed of weights (10A, 10B) cyclically varies during each revolution and reaches a maximum at one crossing of the weights through said plane of symmetry, whereby the penetrating element (16) will be subjected to unidirectional axial thrusts and at the same time to momentarily increased torques causing the element to rotate stepwise in a predetermined direction. Each weight (10) is pivoted to a fixed crankshaft (9) and is longitudinally slidable in a bearing (11) mounted by trunnions (12) in a flywheel (3). <IMAGE> |
