Hydraulically operated oscillator control apparatus

Claim 1

A HYDRAULICALLY OPERATED OSCILLATOR APPARATUS OF THE CHARACTER DESCRIBED COMPRISING A HYDRAULIC ACTUATOR MEANS COMPRISING A PISTON AND PISTON ROD ADAPTED TO BE LONGITUDIALLY RECIPROCATED IN A FIRST CYLINDER BY PRESSURIZED FLUID; A FLUID-OPERATED DIRECTIONAL CONTROL MEANS COMMUNICABLE WITH SAID PISTON FOR DIRECTIONAL CONTROL OF THE PISTON ROD AND ADAPTED TO ALTERNATELY PERMIT FLUID FLOW INTO AND FROM SAID FIRST CYLINDER; AND FLUID-OPERATED MEANS FOR OPERATING SAID DIRECTIONAL CONTROL MEANS TO CONTROL FLUID INTO AND FROM SAID FIRST CYLINDER COMPRISING A SECOND CYLINDER COMMUNICABLE WITH SAID FIRST CYLINDER AND WITH SAID DIRECTIONAL CONTROL MEANS, AND VALVE MEANS ADAPTED TO BE LONGITUDINALLY MOVED IN SAID SECOND CYLINDER IN ONE DIRECTION TO EFFECT TERMINATION OF FLUID COMMUNICATION BETWEEN SAID SECOND CYLINDER AND SAID DIRECTIONAL CONTROL MEANS AT ONE END OF ITS LONGITUDINAL TRAVERSE AND TO BE LONGITUDINALLY MOVED IN THE OPPOSITE DIRECTION TO EFFECT FLUID COMMUNICATION BETWEEN SAID SECOND CYLINDER AND SAID DIRECTIONAL CONTROL MEANS AT THE OPPOSITE END OF ITS LONGITUDINAL TRAVERSE, MOVEMENT OF SAID VALVE MEANS IN SAID ONE DIRECTION BEING RESPONSIVE TO PRESSURE CHANGE IN SAID FIRST CYLINDER WHEN SAID PISTON ROD IS AT ONE END OF ITS LONGITUDINAL TRAVERSE AND IN MOVEMENT IN SAID OPPOSITE DIRECTION BEING RESPONSIVE TO PRESSURE CHANGE IN SAID FIRST CYLINDER WHEN SAID PISTON ROD IS AT THE OPPOSITE END OF ITS LONGITUDINAL TRAVERSE.