Steering device for a track-laying vehicle

Claim 1

A DEVICE FOR CONTROLLING THE BRAKING OF A MOVING TRACK-LAYING VEHICLE HAVING TWO TRACKS AND THE STEERING OF THE VEHICLE, SAID DEVICE COMPRISING IN COMBINATION: A BRAKE FOR EACH TRACK; A HYDRAULIC SERVO MEANS FOR EACH BRAKE TO ACTUATE THE SAME BY OPERATION OF THE RESPECTIVE SERVO MEANS; A SUPPLY CONDUIT FOR SUPPLYING HYDRAULIC PRESSURE FLUID TO THE DEVICE; FIRST VALVE MEANS COMMON TO BOTH SERVO MEANS AND CONNECTED TO SAID SUPPLY CONDUIT FOR FEEDING PRESSURE FLUID TO THE VALVE MEANS AND DISCHARGING THE SAME THEREFROM, SAID VALVE MEANS INCLUDING SPRING MEANS BIASING THE SAME INTO A NEUTRAL POSITION IN WHICH FLOW OF PRESSURE FLUID THROUGH THE VALVE MEANS IS BLOCKED; SECOND VALVE MEANS, ONE FOR EACH OF THE SERVO MEANS AND CONNECTED THERETO; FIRST FEED CONDUITS CONNECTING THE FIRST VALVE MEANS TO EACH OF THE SECOND VALVE MEANS; DRIVING BRAKING CONTROL MEANS COACTING WITH THE FIRST VALVE MEANS FOR MOVING THE SAME AGAINST THE ACTION OF THE SPRING MEANS THEREOF FROM THE NEUTRAL POSITION INTO AN ACTIVE POSITION IN WHICH THE FIRST VALVE MEANS IS OPEN FOR THE FLOW OF PRESSURE FLUID INTO SAID FEED CONDUITS, THE FLOW OF FLUID THROUGH THE FEED CONDUITS INTO THE SECOND VALVE MEANS CAUSING BOTH SAID VALVE MEANS TO MOVE FROM A NEUTRAL POSITION INTO AN ACTIVE POSITION IN WHICH BOTH SECOND VALVE MEANS ARE OPEN FOR THE FLOW OF FLUID TO THE SERVO MEANS, THEREBY SIMULTANEOUSLY ACTIVATING BOTH BRAKES; THIRD VALVE MEANS COMMUNICATING WITH SAID PRESSURE FLUID SUPPLY CONDUITS AND BIASED INTO A NEUTRAL POSITION BLOCKING THE FLOW OF PRESSURE FLUID THROUGH THE THIRD VALVE MEANS;

Claim 2

A DEVICE FOR CONTROLLING THE BRAKING OF A MOVING TRACK-LAYING VEHICLE HAVING TWO TRACKS AND THE STEERING OF THE VEHICLE, SAID DEVICE COMPRISING IN COMBINATION: A BRAKE FOR EACH TRACK; A HYDRAULIC SERVO MEANS FOR EACH BRAKE TO ACTUATE THE SAME BY OPERATION OF THE RESPECTIVE SERVO MEANS; A SUPPLY CONDUIT FOR SUPPLYING HYDRAULIC PRESSURE FLUID TO THE DEVICE; FIRST VALVE MEANS COMMON TO BOTH SERVO MEANS AND CONNECTED TO SAID SUPPLY CONDUIT FOR FEEDING PRESSURE FLUID TO THE VALVE MEANS AND DISCHARGING THE SAME THEREFROM, SAID VALVE MEANS INCLUDING SPRING MEANS BIASING THE SAME INTO A NEUTRAL POSITION IN WHICH FLOW OF PRESSURE FLUID THROUGH THE VALVE MEANS IS BLOCKED; SECOND VALVE MEANS, ONE FOR EACH OF THE SERVO MEANS AND CONNECTED THERETO; FIRST FEED CONDUITS CONNECTING THE FIRST VALVE MEANS TO EACH OF THE SECOND VALVE MEANS; DRIVING BRAKING CONTROL MEANS COACTING WITH THE FIRST VALVE MEANS FOR MOVING THE SAME AGAINST THE ACTION OF THE SPRING MEANS THEREOF FROM THE NEUTRAL POSITION INTO AN ACTIVE POSITION IN WHICH THE FIRST VALVE MEANS IS OPEN FOR THE FLOW OF PRESSURE FLUID INTO SAID FEED CONDUITS, THE FLOW OF FLUID THROUGH THE FEED CONDUITS INTO THE SECOND VALVE MEANS CAUSING BOTH SAID VALVE MEANS TO MOVE FROM A NEUTRAL POSITION INTO AN ACTIVE POSITION IN WHICH BOTH SECOND VALVE MEANS ARE OPEN FOR THE FLOW OF FLUID TO THE SERVO MEANS, THEREBY SIMULTANEOUSLY ACTIVATING BOTH BRAKES; THIRD VALVE MEANS COMMUNICATING WITH SAID PRESSURE FLUID SUPPLY CONDUITS AND BIASED INTO A NEUTRAL POSITION BLOCKING THE FLOW OF PRESSURE FLUID THROUGH THE THIRD VALVE MEANS;