Continuous sandblast apparatus

Claim 1

PORTABLE SANDBLASTING APPARATUS FOR CONTINUOUS TREATMENT OF PAVEMENT SURFACES, COMPRISING: A MOTOR-DRIVEN VEHICLE HAVING A CAB AND DRIVER''S POSITION AT THE FORWARD END THEREOF, A SAND SUPPLY BIN MOUNTED ON THE VEHICLE CHASSIS, AN AIR COMPRESSOR, A PAIR OF PRESSURIZED SAND CHAMBERS POSITIONED BELOW SAID SAND SUPPLY BIN AND ADAPTED TO RECEIVE SAND THEREFROM, A SANDBLAST NOZZLE MOUNTED ON SAID VEHICLE ON ONE SIDE OF SAID CAB AND WITHIN THE VISUAL OBSERVATION OF SAID DRIVER, A CONDUIT CONNECTING SAID AIR COMPRESSOR TO SAID NOZZLE, CONDUIT MEANS CONNECTING SAID PRESSURIZED SAND CHAMBERS TO SAID CONDUIT TO PROVIDE A FLOW OF SAND THERETO, AND CONTROL MEANS INCLUDING MEANS IN SAID CAB WITHIN REACH OF SAID DRIVER''S POSITION FOR SELECTIVELY CONTROLLING THE AIR SUPPLY FROM SAID COMPRESSOR TO SAID PRESSURE CHAMBERS, SELECTIVELY CONTROLLING THE SUPPLY OF SAND FROM SAID SAND BIN TO SAID PRESSURIZED CHAMBERS, AND SELECTIVELY CONTROLLING THE FLOW OF SAND FROM SAID CHAMBERS INTO SAID CONDUIT SO THAT ONE OF SAID CHAMBERS MAY BE USED WHILE THE OTHER IS BEING FILLED WITH SAND TO THEREBY PROVIDE A CONTINUOUS SUPPLY OF SAND TO SAID CONDUIT FOR A SANDBLASTING OPERATION.