Patent ID: 7731891

Claim:
A rotary degasser including: (a) a motor; (b) a motor shaft having a first end and a second end, the first end connected to the motor; (c) a coupling having a first coupling member and a second coupling member, the first coupling member connected to the second end of the motor shaft, the second coupling member comprising a bore having an opening, the bore for receiving an end of a rotor shaft through the opening, the bore having an end distal the opening and an end proximal the opening, the distal end being tapered and not threaded, the proximal end being threaded, the distal end comprising a passage for transferring gas, the first coupling member in communication with the passage; (d) a rotor shaft having: (i) a first end and a second end, the first end being received in and connected to the second coupling member; and (ii) a passage through the rotor shaft, the passage including an opening in the first end of the rotor shaft and an opening in the second end of the rotor shaft; and (e) a rotor connected to the second end of the rotor shaft.