| 摘要 |
A vibrator for, and a method for, compacting concrete and the like material in which the vibrator has a housing and an eccentric mass therein, a fluid supply leads into the chamber in which the mass is located for actuating the mass by fluid pressure and an exhaust leads from the chamber. The rate of supply of fluid to the chamber is regulated by a control sensitive to the amplitude of movement of the eccentric mass so that when the vibrator is engaged with the material to be compacted there is maximum fluid flow to the chamber and when the vibrator is disengaged from the material, the supply of fluid to the chamber is reduced.
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