Control device for air motor

Claim 1

AN AIR OPERATED CONTROL DEVICE COMPRISING: A HOUSING DEFINING A VALVE CHAMBER; A SPOOL VALVE DISPOSED FOR RECTILINEAR MOVEMENT IN SAID CHAMBER, IN AIR SEALING RELATION WITH THE WALLS THEREOF; SAID HOUSING HAVING CONTROL PASSAGES COMMUNICATING WITH SAID VALVE CHAMBER, FOR SELECTIVE COMMUNICATION WITH EACH OTHER BY MEANS OF SAID SPOOL VALVE; MEANS URGING SAID SPOOL VALVE TOWARD ONE END OF SAID CHAMBER; CONDUIT MEANS COMMUNICATING SAID ONE END OF SAID CHAMBER WITH A SUPPLY OF PRESSURIZED AIR; A REGULATING VALVE IN SAID CONDUIT MEANS FOR CONTROLLING THE FLOW OF AIR TO SAID CHAMBER; MEANS DEFINING A FIRST BLEED PASSAGE COMMUNICATING THE ENDS OF SAID CHAMBER ON EITHER SIDE OF SAID SPOOL VALVE; MEANS DEFINING A SECOND BLEED PASSAGE OPENING FROM THE OTHER END OF SAID CHAMBER; AND SAID SPOOL VALVE BEING SELECTIVELY MOVED AND POSITIONED WITHIN SAID CHAMBER, TO CONTROL THE FLOW OF AIR THROUGH SAID CONTROL PASSAGES THROUGH SELECTIVE CONTROL OF SAID REGULATING VALVE.