Remote control system for fluid actuated mechanism

Claim 1

IN A SYSTEM FOR AN AIR-ABRASIVE BLAST OPERATION HAVING A SOURCE OF COMPRESSED AIR, AN AIR BLAST LINE LEADING THEREFROM TO CARRY AN AIR BLAST STREAM, SAID LINE TERMINATING IN A BLAST NOZZLE, A SOURCE OF ABRASIVE WITH A PASSAGEWAY LEADING THEREFROM CONNECTED TO SAID AIR BLAST LINE, MEANS ASSOCIATED WITH SAID PASSAGEWAY FOR INTRODUCING ABRASIVE INTO SAID AIR BLAST STREAM, AND A BLAST STREAM VALVE IN SAID AIR BLAST LINE, SAID BLAST STREAM VALVE BEING OF THE DIAPHRAGM TYPE HAVING A FLUID CHAMBER WITHIN THE VALVE HOUSING ONE SIDE OF WHICH IS A FIRST DIAPHRAGM TO WHICH IS CONNECTED THE CLOSURE MEMBER OF SAID VALVE, AND A FLUID CARRYING PASSAGEWAY LEADING FROM WITHOUT SAID VALVE HOUSING INTO SAID FLUID CHAMBER, THE COMBINATION THEREWITH OF A REMOTE CONTROL APPARATUS THEREFOR COMPRISING: AN AIR-TIGHT CHAMBER, ONE WALL OF WHICH IS A SECOND DIAPHRAGM MOVABLE IN ONE DIRECTION WITH AN INCREASE IN FLUID PRESSURE IN SAID AIR-TIGHT CHAMBER AND IN THE OPPOSITE DIRECTION WITH A DECREASE IN FLUID PRESSURE IN SAID AIR-TIGHT CHAMBER; A CONDUIT; A SOURCE OF COMPRESSED AIR CONNECTED TO ONE END OF SAID CONDUIT; A CONTROL VALVE IN SAID CONDUIT FOR SELECTIVELY CONNECTING SAID CONDUIT TO THE ATMOSPHERE; A JET EDUCTOR INTERPOSED IN SAID CONDUIT BETWEEN SAID COMPRESSED AIR SOURCE AND SAID CONTROL VALVE; SAID EDUCTOR HAVING A SUCTION ZONE CONNECTED BY AN AIR-TIGHT PASSAGEWAY TO SAID AIR-TIGHT CHAMBER TO ACCELERATE SAID MOVABLE SECOND DIAPHRAGM INWARDLY WHEN SAID CONTROL VALVE IS OPENED; A HOUSING SECURED TO THE PERIPHERY OF SAID SECOND DIAPHRAGM AND EXTENDING THEREBELOW TO FORM A LOWER CHAMBER; A VENT THROUGH SAID HOUSING CONNECTING SAID LOWER CHAMBER WITH THE ATMOSPHERE; A DOWNWARDLY EXTENDING HOLLOW OUTER CYLINDER CONNECTED TO THE LOWER SIDE OF SAID LAST-NAMED HOUSING AND LEADING FROM SAID LOWER CHAMBER; AN INNER HOLLOW CYLINDER AXIALLY SLIDABLY POSITIONED IN SAID OUTER CYLINDER AND CLOSED AT BOTH ITS LOWER AND UPPER ENDS; A STEM ATTACHED TO THE UPPER END OF SAID INNER CYLINDER EXTENDING UPWARDLY THROUGH SAID LOWER CHAMBER AND SECURED AT ITS UPPER END TO SAID SECOND DIAPHRAGM TO BE AXIALLY MOVED AS SAID SECOND DIAPHRAGM IS MOVED; A FIRST PORT THROUGH THE WALL OF SAID OUTER CYLINDER AND A CONDUIT HAVING ONE END FITTED IN SAID PORT LEADING FROM A SOURCE OF COMPRESSED AIR; A SECOND FIXED PORT THROUGH THE WALL OF SAID OUTER CYLINDER OPPOSING SAID FIRST FIXED PORT AND A CONDUIT COMMUNICATING BETWEEN SAID SECOND FIXED PORT AND SAID FLUID-CARRYING PASSAGEWAY LEADING INTO SAID FLUID CHAMBER OF SAID BLAST STREAM VALVE; A FIRST MOVABLE PORT THROUGH THE WALL OF SAID INNER CYLINDER POSITIONED TO BE MOVED INTO ENGAGEMENT WITH SAID FIRST FIXED PORT WHEN SAID SECOND DIAPHRAGM IS MOVED INWARDLY WITH RESPECT TO SAID AIR-TIGHT CHAMBER; A SECOND MOVABLE PORT THROUGH THE WALL OF SAID INNER CYLINDER, SAID SECOND PORT BEING ELONGATED TO HAVE GREATER AXIAL LENGTH THAN SAID SECOND FIXED PORT AND POSITIONED SO THAT ITS LOWER AREA IS IN ENGAGEMENT WITH SAID SECOND FIXED PORT WHEN SAID FIRST MOVABLE PORT IS IN ENGAGEMENT WITH SAID FIRST FIXED PORT; SAID GREATER AXIAL LENGTH OF SAID SECOND MOVABLE PORT, AND THE LENGTH OF SAID OUTER CYLINDER BEING SUCH THAT WHEN SAID INNER CYLINDER IS MOVED AXIALLY DOWNWARDLY TO PUT SAID FIRST MOVABLE PORT OUT OF ENGAGEMENT WITH SAID FIRST FIXED PORT, THE UPPER AREA OF SAID ELONGATED SECOND MOVABLE PORT IS IN ENGAGEMENT WITH SAID SECOND FIXED PORT AND THE LOWER AREA THEREOF IS BELOW THE LOWER END OF SAID OUTER CYLINDER TO THEREBY PUT SAID SECOND FIXED PORT IN COMMUNICATION WITH THE ATMOSPHERE TO PERMIT RELEASE OF THE AIR PRESSURE FROM SAID FLUID CHAMBER OF SAID BLAST STEAM VALVE.