Constant speed control for hydraulic motors

Claim 1

IN A HYDRAULIC TRANSMISSION SYSTEM INCLUDING A SOURCE OF FLUID PRESSURE AND A REVERSIBLE FLUID MOTOR OPERABLY THEREBY, CONDUITS LEADING TO AND FROM THE MOTOR EITHER OF WHICH MAY CONDUCT FLUID PRESSURE TO THE MOTOR OR RETURN FLUID THEREFROM, CONTROL MEANS BETWEEN THE FLUID PRESSURE SOURCE AND THE MOTOR FOR SELECTIVELY CONNECTING EITHER CONDUIT TO THE FLUID PRESSURE SOURCE AND RENDERING THE OTHER CONDUIT A RETURN TO CONTAOL THE DIRECTION OF OPERATION OF THE MOTOR, SAID CONTROL MEANS SERVING AT WILL TO REGULATE AND TO VARY THE RATE OF FLUID FLOW FROM THE FLUID SOURCE TO THE MOTOR; REGULATING MEANS BETWEEN THE FLUID PRESSURE SOURCE AND SAID CONTROL MEANS RESPONSIVE TO PRESSURE IN THE CONDUIT DELIVERING FLUID FROM THE CONTROL MEANS TO THE MOTOR AND ALSO TO PRESSURE SUPPLIED BY THE FLUID PRESSURE SOURCE FOR REGULATING THE RATE AT WHICH FLUID IS SUPPLIED TO THE CONTROL MEANS, AND MEANS FOR CAUSING THE REGULATING MEANS TO SHUT OFF THE SUPPLY OF FLUID FROM THE FLUID PRESSURE SOURCE TO THE CONTROL MEANS INCLUDING A SOLENOID VALVE WHOSE SOLENOID ON BEING DE-ENERGIZED WILL ALLOWING THE REGULATING MEANS TO EFFECT A SHUT OFF.