Patent ID: 6412338
Filing Date: 2002-07-02
Classification: B03C,B05B,Y10S

Abstract:
A viscometer for measuring or characterizing the stress required to shear a fluid at a given rate comprising a pair of members coaxially mounted for relative rotation, an annular gap between said members defining a flow path for the fluid, a driver for producing such differential rotation, and a sensor for measuring the torque or torque equivalent required to achieve such differential rotation between said members, said driver comprising a motor, and a magnetic drive coupling between said motor and one of said members, the other of said members being relatively fixed, said magnetic drive coupling comprising a driving magnet rotatably driven by said motor, and a driven magnet driven by said driving magnet, said other member comprising a cup fixedly mounted within a housing, said housing having a bore in coaxial alignment with an open end of said cup, and a hollow shaft rotatably mounted in said bore, said shaft extending into said cup, and said one member comprising a bob fixedly mounted on said shaft within said cup.