Hydraulically driven articulated vehicle

Claim 1

A HYDRAULICALLY DRIVEN ARTICULATED VEHICLE COMPRISING, A FRONT CHASSIS AND A REAR CHASSIS, LOCOMOTIVE MEANS MOUNTED ON EACH OF SAID CHASSIS, A HYDRAULIC MOTOR MEANS ON EACH CHASSIS DRIVINGLY CONNECTED THROUGH A CORRESPONDING TRANSMISSION MEANS TO SAID LOCOMOTIVE MEANS ON THE CORRESPONDING ONE OF EACH OF SAID CHASSIS, PUMP MEANS CONNECTED IN SERIES BY A FLUID PRESSURE LINE TO ALL SAID MOTOR MEANS, CONTROL VALVE MEANS MOUNTED IN SAID FLUID PRESSURE LINE OPERABLY CONNECTED TO SAID PUMP MEANS AND SAID MOTOR MEANS, SAID CONTROL VALVE MEANS CONSTRUCTED AND ADAPTED TO PASS HYDRAULIC FLUID UNDER PRESSURE THROUGH SAID MOTOR MEANS IN EITHER DIRECTION, SAID VALVE MEANS INCLUDING A PRESSURE RELIEF VALVE, A CHECK VALVE, AND A DIRECTIONAL VALVE CONNECTED IN SERIES IN SAID FLUID PRESSURE LINE AND OPERABLE UNDER LOAD CONDITIONS TO INCREASE THE PRESSURE OF THE HYDRAULIC FLUID TO SAID MOTOR MEANS, COUPLING MEANS FOR CONNECTING SAID FRONT CHASSIS TO SAID REAR CHASSIS HAVING A VERTICAL TRUNNION AND A HORIZONTAL TRUNNION, SAID REAR CHASSIS TURNABLY MOUNTED ON SAID HORIZONTAL TRUNNION, SAID FRONT AND REAR CHASSIS TURNABLY MOUNTED ON SAID VERTICAL TRUNNION WHEREBY SAID VEHICLE CONSTRUCTED AND ADAPTED TO BE HYDRAULICALLY DRIVEN ON EACH OF SAID FRONT AND REAR CHASSIS WITH SAID CONNECTING MEANS OPERABLE TO CONTINUOUSLY MAINTAIN CONTACT WITH THE SUPPORTING SURFACE.