Compressors

Claim 1

A DEVICE FOR CHANGING THE VOLUME OF A GAS, SAID DEVICE COMPRISING IN COMBINATION A DRIVE SHAFT, AN HOUR GLASS SCREW MOUNTED ON SAID DRIVE SHAFT, A PLURALITY OF DISCRETE THREADS ON SAID SCREW, EACH EXTENDING FROM ONE END TO THE OTHER THEREOF, CASING MEANS ENCIRCLING SAID SCREW, THE INNER WALL OF SAID CASING MEANS COOPERATING WITH THE CRESTS OF SAID THREADS TO FORM WITH EACH PAIR OF ADJACENT THREADS A COMPRESSION CHAMBER FOR SAID GAS, A RELATIVELY FIXED TRANSVERSE PLATE IN SEALING ENGAGEMENT WITH ONE END OF SAID SCREW, A HIGH PRESSURE OUTLET FROM SAID COMPRESSOR AT THE SAME END OF SAID SCREW AS SAID PLATE AND A LOW PRESSURE INLET TO SAID COMPRESSOR AT THE OPPOSITE END OF SAID SCREW, AT LEAST ONE ROTATABLE TOOTHED WORM GEAR DRIVEN BY SAID SCREW AND HAVING A PLURALITY OF ITS TEETH SIMULTANEOUSLY IN ENGAGEMENT BETWEEN THE THREADS OF SAID SCREW, IN WHICH POSITION THEY BLOCK OFF FROM SAID LOW PRESSURE INLET THOSE PORTIONS OF SAID COMPRESSION CHAMBERS WHICH LIE BETWEEN SAID PLATE AND THE TEETH ON SAID WORM GEAR, SAID PLATE BEING PROVIDED WITH AN ORIFICE ADJACENT SAID WORM GEAR COMMUNICATING WITH SAID HIGH PRESSURE OUTLET AND POSITIONED TO REGISTER EXCLUSIVELY WITH THE ADJACENT END OF EACH ONE OF SAID COMPRESSION CHAMBERS SUCCESSIVELY AS SAID SCREW ROTATES, SAID PLATE BLOCKING OFF FROM SAID HIGH PRESSURE OUTLET ALL OF THE COMPRESSION CHAMBERS EXCEPT THE ONE HAVING ITS END IN REGISTRATION WITH SAID ORIFICE.

Claim 2

A DEVICE FOR CHANGING THE VOLUME OF A GAS, SAID DEVICE COMPRISING IN COMBINATION A DRIVE SHAFT, AN HOUR GLASS SCREW MOUNTED ON SAID DRIVE SHAFT, A PLURALITY OF DISCRETE THREADS ON SAID SCREW, EACH EXTENDING FROM ONE END TO THE OTHER THEREOF, CASING MEANS ENCIRCLING SAID SCREW, THE INNER WALL OF SAID CASING MEANS COOPERATING WITH THE CRESTS OF SAID THREADS TO FORM WITH EACH PAIR OF ADJACENT THREADS A COMPRESSION CHAMBER FOR SAID GAS, A RELATIVELY FIXED TRANSVERSE PLATE IN SEALING ENGAGEMENT WITH ONE END OF SAID SCREW, A HIGH PRESSURE OUTLET FROM SAID COMPRESSOR AT THE SAME END OF SAID SCREW AS SAID PLATE AND A LOW PRESSURE INLET TO SAID COMPRESSOR AT THE OPPOSITE END OF SAID SCREW, AT LEAST ONE ROTATABLE TOOTHED WORM GEAR DRIVEN BY SAID SCREW AND HAVING A PLURALITY OF ITS TEETH SIMULTANEOUSLY IN ENGAGEMENT BETWEEN THE THREADS OF SAID SCREW, IN WHICH POSITION THEY BLOCK OFF FROM SAID LOW PRESSURE INLET THOSE PORTIONS OF SAID COMPRESSION CHAMBERS WHICH LIE BETWEEN SAID PLATE AND THE TEETH ON SAID WORM GEAR, SAID PLATE BEING PROVIDED WITH AN ORIFICE ADJACENT SAID WORM GEAR COMMUNICATING WITH SAID HIGH PRESSURE OUTLET AND POSITIONED TO REGISTER EXCLUSIVELY WITH THE ADJACENT END OF EACH ONE OF SAID COMPRESSION CHAMBERS SUCCESSIVELY AS SAID SCREW ROTATES, SAID PLATE BLOCKING OFF FROM SAID HIGH PRESSURE OUTLET ALL OF THE COMPRESSION CHAMBERS EXCEPT THE ONE HAVING ITS END IN REGISTRATION WITH SAID ORIFICE.