Document Type and Number:
Japanese Patent JPS4950368
Kind Code:
A
Abstract:
A hydraulic exciter of vibrations for a vibratory compactor includes an exciter cylinder containing a piston which is movable to and fro in the cylinder and either the piston or the cylinder is connected to a compacting member. The movement of the piston in the cylinder is brought about either by an alternating source of hydraulic fluid pressure which forces fluid alternately into and out of the exciter cylinder to move the piston to and fro or by means of a uni-directional source of hydraulic fluid under pressure formed by a hydraulic pressure pump together with a control valve in between the pump and the exciter cylinder. The control valve is operated to switch the supply of hydraulic fluid to and fro in the cylinder from one side of the piston to the other to produce the relative to and fro movement of the piston in the cylinder. The control valve has means for varying its speed of operation to vary the frequency of the vibrations produced by the exciter.
Application Number:
JP7040173A
Publication Date:
May 16, 1974
Filing Date:
June 21, 1973
Export Citation:
International Classes:
E01C19/30; B06B1/18; E01C19/38; F04B9/10; F04B31/00; F15B7/02; F15B11/12; F15B11/15; (IPC1-7): B06B1/10