CONCRETE CURB LAYING MACHINE
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Abstract
A SELF-PROPELLED, SELF-STEERING AND SELF-LEVELING MACHINE FOR LAYING CONCRETE CHARACTERIZED BY ACCURATE, AUTOMATIC OR MANUAL, ADJUSTMENT AND CONSTANT CONTROL OF DIRECTION, GRADE AND FORWARD OR REVERSE MOITION. IN ONE EMBODIMENT THE MACHINE INCLUDES INDEPENDENTLY CONTROLLED FRONT AND REAR PROPULSION SADDLE-MOUNTED MEANS ON EACH SIDE OF THE MAIN FRAME, CONTROL MEANS OPERATING FROM A GUIDE LINE ADAPTED TO PROVIDE INTEGRATED DOUBLE-ACTING STEERING OF OPPOSITE PAIRS OF THE PROPULSION MEANS AND A HYDRAULIC SYSTEM INCLUDING A PAIR OF DOUBLE-ACTING RAMS ON ONE SIDE OF THE MACHINE, ONE SUPPORTING THE MAIN FRAME DIRECTLY UPON EACH SADDLE MOUNT, AND A SINGLE DOUBLE-ACTING RAM CONNECTED TO A WALKING BEAM SUPPORTED AT ITS ENDS ON THE OTHER SADDLE MOUNTS ON THE OPPOSITE SIDE OF THE MACHINE PROVIDING A THREE-POINT LEVELING IN A FIVE POINT SUSPENSION. IN ANOTHER EMBODIMENT THE HYDRAULIC SYSTEM IS CHARACTERIZED BY ELECTRO-HYDRAULIC MEANS TO INDIVIDUALLY POWER BOTH SIDES OF THE MACHINE TO MAINTAIN CONSTANT CURVE RADIUS AND INCLUDING AUTOMATIC VALVE MEANS TO CONNECT AN AUXILIARY POWER SOURCE INTO THE SYSTEM TO MEET THE HIGHER DEMAND OF THE OUTER PROPULSION MEANS FOR SHORTER CURVE RADII. MANUAL CONTROL OVER-RIDE AND FORWARD SPEED CONTROL ARE ALSO PROVIDED AS WELL AS STEERING OVER-RUN COMPENSATION ADAPTED TO MEET ONLY THE STEERING POTENTIAL NEED OF THE SYSTEM AND STEER BY INTEGRALS RATHER THAN HUNTING. MEANS ARE PROVIDED TO MOVE THE STEERING SENSOR IN THE DIRECTION OF STEER TO REDUCE OR ELIMINATE HUNTING AND OVERSTEER. THE PROPULSION MEANS FOR DELIVERY OF THE CONCRETE TO THE MULE IS INDEPENDENT OF THE LEVELLING AND STEERING SYSTEMS PROVIDING FOR EXTREMELY FINE PROPORTIONING OF FORWARD SPEED AND RATE OF FEED OF CONCRETE TO THE MULE.
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