Sandblast generator

Claim 1

AN AUTOMATIC SYSTEM FOR BLASTING ABRASIVE COMPRISING: AN ABRASIVE CONTAINER; ABRASIVE VALVE MEANS FOR PERMITTING ABRASIVE TO ESCAPE SAID CONTAINER; FLUID-PRESSURE VALVE MEANS FOR PRESSURIZING SAID ABRASIVE CONTAINER AND FOR OPENING SAID ABRASIVE VALVE MEANS; A PRESSURE CHARGING PIPE LEADING FROM SAID FLUID-PRESSURE VALVE TO SAID ABRASIVE CONTAINER; A BLAST HOSE LEADING FROM SAID FLUID PRESSURE VALVE PAST SAID ABRASIVE VALVE MEANS TO AN ABRASIVEBLAST NOZZLE; SAID FLUID-PRESSURE VALVE MEANS COMPRISING A FLUID INLET PORT, A FIRST FLUID PASSAGE COMMUNICATING WITH SAID INLET PORT AND LEADING TO A FIRST JUNCTION CHAMBER, A FIRST FLUID VALVE IN SAID FIRST FLUID PASSAGE, SAID JUNCTION CHAMBER COMMUNICATING WITH BOTH SAID PRESSURE CHARGING PIPE AND SAID ABRASIVE BLAST HOSE, A SECOND FLUID PASSAGE LEADING FROM SAID JUNCTION CHAMBER TO A VENT PORT, AND A VENT VALVE IN SAID SECOND FLUID PASSAGE; AND REMOTE MEANS FOR EFFECTING CONTROL OF SAID FLUID-PRESSURE VALVE MEANS.