Air shifter construction for pneumatic systems

Claim 1

ROTARY AIR SHIFTER CONSTRUCTION FOR SUPPLYING AIR UNDER PRESSURE OR VACUUM FROM A BLOWER TO A PNEUMATIC TUBE CONVEYOR SYSTEM, INCLUDING A VALVE BODY, A VALVE SHUTTER HAVING OPOSITE VALVING EDGES ROTATABLE IN ONE DIRECTION IN SAID VALVE BODY, A DRIVE MOTOR CONNECTED WITH THE SHUTER FOR ROTATING THE SHUTTER IN ONE DIRECTION, FLEXIBLE SEALING MEANS AT THE EDGES OF THE SHUTTER ENGAGING THE VALVE BODY DURING SHUTTER ROTATION, THE VALVE BODY BEING PROVIDED WITH FOUR OPENINGS SPACED 90* APART RADIATING FROM THE CENTER OF SHUTTER ROTATION; THE SHUTTER VALVING EDGES PASSING ACROSS SAID FOUR OPENINGS SUCCESSIVELY DURING SHUTTER ROTATION, TWO OPPOSITE OPENINGS BEING ADAPTED TO COMMUNICATE ONE EACH WITH THE INTAKE AND EXHAUST OF A BLOWER, THE OTHER TWO OPPOSITE OPENINGS BEING ADAPTED TO COMMUNICATE ONE EACH WITH THE ATMOSPHERE AND A PNEUMATIC TUBE SYSTEM; FOUR CONTROL LIMIT SWITCHES ASSOCIATED WITH THE SHUTTER AND CONNECTED WITH A POWER SUPPLY CIRCUIT FOR THE SHUTTER DRIVE MOTOR, SAID SWITCHES HAVING CONTACT ACTUATORS LOCATED 45* APART CIRCUMFERENTIALLY OF THE AXIS OF SHUTTER ROTATION, A SYMMETRICAL DOUBLE-ENDED CONTROL CAM ON THE SHUTTER DRIVE SHAFT, AND THE ENDS OF THE CAM SUCCESSIVELY PASSING AND ACTUATING ONE AFTER ANOTHER OF SAID SWITCH ACTUATORS DURING SHUTTER ROTATION.