Torsion digital viscometer

Claim 2

A torsion type digital viscometer, comprising a fixed tank adapted to contain a viscous material the viscosity of which is to be measured, a rotor adapted to be immersed into the viscous material, a torsion bar connected to said rotor, motor means connected to drive said rotor by means of said torsion bar, said torsion bar including gear teeth mounted on said torsion bar at axial intervals, fixed magnetic pickups supported opposite said teeth and a detector circuit connected to said pickups for detecting the output phase difference signal between said magnetic pickups, a gate circuit to be opened and closed by the detected phase difference signal, a clock pulse oscillating circuit connected to said gate circuit, and counter connected to the output circuit of said gate circuit.

Claim 3

A torsion type digital viscometer, comprising a tank adapted to contain a viscous material the viscosity of which is to be measured, a shaft mounted rotor adapted to be immersed into the viscous material, a torsion bar connected to the shaft of said rotor, a motor connected to rotatably drive said rotor through said torsion bar, a pair of cylinders each having gear teeth on their exterior circumferences mounted on said torsion bar at axial intervals, A pair of rings each having gear teeth on their interior circumferences, each ring being mounted coaxially with an associated cylinder and about the exterior circumference of said associated cylinder, a cylindrical coupler holding said rings in one body, mounting means for said cylindrical coupler and said rings enabling said coupling and rings to rotate about its axis and free of said torsion bar, a pair of spaced magnets and yokes forming closed magnetic paths together with said cylinders and said rings, said magnets and yokes being fixed in a state of repose, regardless of the turning motion of said cylinders and said rings, detecting coils disposed in the magnetic flux path in each of said closed magnetic paths, and a detection circuit connected to the detecting coils for detecting the output phase difference between said detecting coils.

Claim 4

A torsion type digital viscometer, comprising a tank adapted to contain a viscous material the viscosity of which is to be measured, a shaft mounted rotor adapted to be immersed into the viscous material, a torsion bar connected to the shaft of said rotor, a motor connected to rotatably drive said rotor through said torsion bar, a pair of cylinders each having gear teeth on their exterior circumferences mounted on said torsion bar at axial intervals, A pair of rings each having gear teeth on their interior circumferences, each ring being mounted coaxially with an associated cylinder and about the exterior circumference of said associated cylinder, a cylindrical coupler holding said rings in one body, mounting means for said cylindrical coupler and said rings enabling said coupling and rings to rotate about its axis and free of said torsion bar, a pair of spaced magnets and yokes forming closed magnetic paths together with said cylinders and said rings, said magnets and yokes being fixed in a state of repose, regardless of the turning motion of said cylinders and said rings, detecting coils disposed in the magnetic flux path in each of said closed magnetic paths, and a detection circuit connected to the detecting coils for detecting the output phase difference between said detecting coils.

Claim 5

A torsion type digital viscometer comprising a tank adapted to contain a viscous material the viscosity of which is to be measured, a rotor adapted to be immersed into said viscous material, a torsion bar having one end connected to said rotor and the other end fixed to a retainer disposed outside said tank, motor means operatively connected to drive said rotor, a pair of cylinders on said torsion bar at axial intervals, each said cylinder having gear teeth on its exterior circumferences, a pair of rings disposed axially along the exterior circumference of said cylinders and having gear teeth on their internal circumferences each ring being cooperatively associated with a cylinder, a cylindrical coupler, means for mounting said rings to said coupler in one body, motor means for turning said rings and cylindrical coupler independently of said torsion bar, a magnet and a yoke associated with each cooperating ring and cylinder and forming closed magnetic paths together with said cylinder and ring, said magnet and yoke being stationary and independently supported from said cylinders and rings, detection coils disposed in the magnetic flux path in each of said closed magnetic paths, and detection circuit means connected to said detection coils for detecting the phase difference of the output of each of said detection coils.

Claim 6

A torsion type digital viscometer comprising a tank adapted to contain a viscous material the viscosity of which is to be measured, a rotor adapted to be immersed into said viscous material, a torsion bar having one end connected to said rotor and the other end fixed to a retainer disposed outside said tank, motor means operatively connected to drive said rotor, a pair of cylinders on said torsion bar at axial intervals, each said cylinder having gear teeth on its exterior circumferences, a pair of rings disposed axially along the exterior circumference of said cylinders and having gear teeth on their internal circumferences each ring being cooperatively associated with a cylinder, a cylindrical coupler, means for mounting said rings to said coupler in one body, motor means for turning said rings and cylindrical coupler independently of said torsion bar, a magnet and a yoke associated with each cooperating ring and cylinder and forming closed magnetic paths together with said cylinder and ring, said magnet and yoke being stationary and independently supported from said cylinders and rings, detection coils disposed in the magnetic flux path in each of said closed magnetic paths, and detection circuit means connected to said detection coils for detecting the phase difference of the output of each of said detection coils.

Claim 7

A torsion type digital viscometer comprising a tank adapted to contain a viscous material to be measured, a rotor adapted to be immersed into said viscous material, motor means for rotatably driving said rotor, a torsion bar having one end connected to the center area of the bottom of said tank and the other end to a fixed external support, a pair of cylinders each having gear teeth on the exterior circumferences, said cylinders being mounted on said torsion bar at axial intervals, a ring associated with each cylinder and having gear teeth on its interior circumference disposed opposite the gear teeth of an associated cylinder, a cylindrical coupler holding said rings in one body, drive means for rotatably driving said cylindrical coupler independently of said torsion bar, a magnet and a yoke associated with each cylinder and forming a closed magnetic path together with said associated cylinders and its associated ring, said magnet and yoke being kept in a state of repose independent of the rotation of said cylinders and said rings, detecting coils disposed in the magnetic flux path in each of said closed magnetic paths and a detection circuit connected to said detecting coils for detecting the output phase difference of each said detecting coil.

Claim 8

A torsion type digital viscometer comprising a tank adapted to contain a viscous material to be measured, a rotor adapted to be immersed into said viscous material, motor means for rotatably driving said rotor, a torsion bar having one end connected to the center area of the bottom of said tank and the other end to a fixed external support, a pair of cylinders each having gear teeth on the exterior circumferences, said cylinders being mounted on said torsion bar at axial intervals, a ring associated with each cylinder and having gear teeth on its interior circumference disposed opposite the gear teeth of an associated cylinder, a cylindrical coupler holding said rings in one body, drive means for rotatably driving said cylindrical coupler independently of said torsion bar, a magnet and a yoke associated with each cylinder and forming a closed magnetic path together with said associated cylinders and its associated ring, said magnet and yoke being kept in a state of repose independent of the rotation of said cylinders and said rings, detecting coils disposed in the magnetic flux path in each of said closed magnetic paths and a detection circuit connected to said detecting coils for detecting the output phase difference of each said detecting coil.

Claim 9

A torsion type digital viscometer comprising a tank, a rotor disposed within said tank wherein a viscous material to be measured is contained, said rotor being fixed at one end on a retainer outside said tank, a torsion bar attached at one end to the center area of the bottom of said tank, a motor attached to the other end of said torsion bar for turning said tank through said torsion bar, a pair of cylinders mounted on said torsion bar at axial intervals, said cylinders having gear teeth on their exterior circumferences, rings mounted axially about the exterior circumferences of said cylinders, said rings having gear teeth on their internal circumferences, a cylindrical bar, a magnet and a yoke disposed to form a closed magnetic path together with an associated cylinder and ring, said magnet and yoke being kept stationary independent of the turning motion of said cylinders and rings, detection coils disposed in the magnetic flux path in each of said closed magnetic paths, and detection circuit means connected to said detection coils for detecting the phase difference of the output of each of said detection coils.

Claim 10

A torsion type digital viscometer comprising a tank, a rotor disposed within said tank wherein a viscous material to be measured is contained, said rotor being fixed at one end on a retainer outside said tank, a torsion bar attached at one end to the center area of the bottom of said tank, a motor attached to the other end of said torsion bar for turning said tank through said torsion bar, a pair of cylinders mounted on said torsion bar at axial intervals, said cylinders having gear teeth on their exterior circumferences, rings mounted axially about the exterior circumferences of said cylinders, said rings having gear teeth on their internal circumferences, a cylindrical bar, a magnet and a yoke disposed to form a closed magnetic path together with an associated cylinder and ring, said magnet and yoke being kept stationary independent of the turning motion of said cylinders and rings, detection coils disposed in the magnetic flux path in each of said closed magnetic paths, and detection circuit means connected to said detection coils for detecting the phase difference of the output of each of said detection coils.

Claim 11

A torsion type digital viscometer comprising a tank, a rotor disposed within said tank wherein a viscous material to be measured is contained, said rotor being fixed on a retainer outside said tank, a torsion bar attached at one end to the center area of the bottom of said tank, a motor connected to the other end of said torsion bar for turning said tank through said torsion bar, a pair of gear toothed projections installed on said torsion bar at axial intervals, fixed type magnetic pickups installed face to face to said gear toothed projection and circuit means for detecting the phase difference of the output between said magnetic pickups.

Claim 12

A torsion type digital viscometer comprising a tank, a rotor disposed within said tank wherein a viscous material to be measured is contained, said rotor being fixed on a retainer outside said tank, a torsion bar attached at one end to the center area of the bottom of said tank, a motor connected to the other end of said torsion bar for turning said tank through said torsion bar, a pair of gear toothed projections installed on said torsion bar at axial intervals, fixed type magnetic pickups installed face to face to said gear toothed projection and circuit means for detecting the phase difference of the output between said magnetic pickups.