Pump with eccentric driven stator

Claim 1

A HELICAL GEAR PUMP COMPRISING A STATOR CONSTITUTED OF AN ELONGATED CYLINDRICAL MEMBER OF RESILIENT FLEXIBLE MATERIAL HAVING INTERNAL HELICAL GROOVES, SAID STATOR BEING ENCASED IN A RIGID SLEEVE AND HAVING AT EACH END A RADIALLY EXTENDING MOUNTING FLANGE OF RESILIENT FLEXIBLE MATERIAL, SAID RIGID SLEEVE IS PROVIDED ADJACENT EACH END WITH A CIRCUMFERENTIAL SERIES OF PERFORATIONS, SAID STATOR AND MOUNTING FLANGES BEING INTEGRALLY CONNECTED THROUGH SAID PERFORATIONS, A CASING FOR SAID PUMP HAVING AN INLET AND AN OUTLET PORT, AND SPACED ANNULAR FLANGES TO WHICH SAID MOUNTING FLANGES ARE SECURED, SAID CASING ALSO HAVING A BEARING STRUCTURE, A HELICAL ROTOR HAVING EXTERNAL THREADS IN PUMPING ENGAGEMENT WITH THE HELICAL GROOVES OF SAID STATOR, A SHAFT SECURED TO SAID ROTOR AND ROTATABLY MOUNTED IN SAID BEARING, SAID CASING ALSO HAVING SEALING MEANS FOR SAID SHAFT BETWEEN SAID BEARING AND SAID ROTOR, WHEREBY WHEN PUMPING, SAID ROTOR ROTATES ON A FIXED AXIS AND SAID STATOR ORBITS IN A CYLINDRICAL PATH BY VIRTUE OF SAID FLEXIBLE MOUNTING FLANGES.