Universal joint and sealing means for screw pumps

Claim 1

IN A SCREW PUMP DRIVEN FOR OPERATION BY A ROTATIONAL INPUT TO A DRIVE SHAFT, THE COMBINATION COMPRISING: A BODY HAVING AN INLET PORT AND AN OUTLET PORT; SEALING MEANS PROVIDED AROUND SAID DRIVE SHAFT ADJACENT SAID INLET PORT; A STATOR HAVING AN INTERNAL HELICAL THREAD FIXED WITHIN SAID BODY BETWEEN SAID INLET PORT AND SAID OUTLET PORT; A ROTOR HAVING AN EXTERNAL HELICAL THREAD, SAID ROTOR BEING MOUNTED FOR ROTATION AND CONCURRENT ECCENTRIC MOVEMENT WITHIN THE STATOR IN COOPERATION WITH SAID STATOR THREAD; AN INTERMEDIATE SHAFT CONNECTED AT OPPOSITE ENDS TO SAID DRIVE SHAFT AND SAID ROTOR; AT LEAST ONE OF SAID CONNECTIONS COMPRISING UNIVERSAL JOINT MEANS CONSISTING OF A BALL-AND-SOCKET JOINT AND A CROSS PIN EXTENDING DIAMETRICALLY THROUGH SAID BALL AND SOCKET AND SECURED TO SAID ROTOR; WHEREBY A HIGH PRESSURE OUTPUT IN SAID OUTLET PORT CAUSES SAID ROTOR AND SAID INTERMEDIATE DRIVEN SHAFT TO BE URGED AXIALLY TOWARD SAID INLET PORT WHEREIN SAID BALLAND-SOCKET JOINT WILL RECEIVE EXCLUSIVELY SAID AXIALLY DIRECTED FORCES AND SAID CROSS PIN WILL TRANSMIT TORQUES ACTING ON SAID ROTOR FROM SAID ROTATIONAL INPUT TO SAID DRIVE SHAFT.