Sandblast machine with precision sandfeed, remotely started and stopped

Claim 1

A SAND BLASTING MACHINE COMPRISING: (A) A SOURCE OF FLUID PRESSURE, (B) A SAND STORAGE TANK CONNECTED TO (A) AND PROVIDED WITH A GRAVITY SAND FEED ORIFICE IN ITS BASE, (C) A SAND BLASTING NOZZLE CONNECTED TO (B) FOR DIRECTING SAND UNDER FLUID PRESSURE TO A SURFACE TO BE BLASTED, (D) A RIGID SAND FEED CHAMBER LOCATED BETWEEN (B) AND (C) FOR RECEIVING SAND BY GRAVITY FROM (B) AND MAINTAINED UNDER PRESSURE FROM (A), (E) MECHANICAL-ELECTRICAL MEANS LOCATED IN SAID CHAMBER (D) FOR CONTROLLING THE SAND FEED RATE THROUGH SAID ORIFICE, (F) SAID MEANS (E) FOR CONTROLLING THE SAND FEED RATE INCLUDES A HORIZONTAL FEED PLATE SUPPORTED ADJACENT SAID SAND FEED ORIFICE AND SPACED THEREFROM SO THAT SAND FALLING ON SAID PLATE WHEN MOTIONLESS WILL BUILD UP INTO A CONICAL PILE UNTIL IT BLOCKS THE OUTLET OF SAID ORIFICE, AND (G) MEANS FOR VIBRATING SAID HORIZONTAL FEED PLATE (F) SO THAT SAID CONICAL SAND PILE WILL BE REDUCED IN HEIGHTH TO PERMIT SAND TO FLOW THROUGH SAID ORIFICE, OVER THE FEED PLATE (F) AND INTO THE NOZZLE CONNECTION (C).