US3901070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Measuring device
Assignee: University of Auckland
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Filing: 1974-06-12
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Granted: 1975-08-26
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Expires: 1994-06-12
Abstract
Abstract A measuring device for measuring the viscosity of a substance and more especially the disruptive yield strength of a fibre network such as paper pulp, the disruptive yield strength being linearly related to consistency or stock concentration of a fibre network, such as a paper pulp suspension, on a logarithmic scale. The device comprises an upper head member which is biased against rotation relative to a base member, the base member being provided with a plurality of outwardly extending pins, such that with the pins inserted into a substance such as a paper pulp suspension, and a torque being applied to the upper head member so as to rotate it relative to the base member, a value of torque, substantially proportional to the viscosity of the substance is reached at which the base member begins to rotate at the same speed as the upper member, said value of torque being determined by the position of the upper head member relative to the base member and which in turn provides a value of a viscosity co-efficient of the substance such as the disruptive yield strength of a paper pulp suspension.
Inventors
- 👤 Geoffrey Graeme Duffy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:15
CPC Classifications
G; G01; G01N; G01N11/00; G01N11/10; G01N11/14; G01N11/142; G01N33/00; G01N33/34
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
222 words
A device for measuring the viscosity of a substance comprising a base member, a plurality of pins provided in and projecting from an outer surface of said base member, said base member being provided with a substantially central upwardly directed boss portion, an aperture provided in said boss portion, a head member being provided with, and rotatably mounted about, a downwardly depending substantially central shaft member, said shaft member being inserted within said aperture in said boss portion so as to rotatably locate said head member relative to said base member, a spring being provided and mounted between said base member and head member, said spring biasing the head member against rotation relative to said base member, indicating means being provided and associated with said head member so as to move with said head member, a scale being provided on said base member, the arrangement being such that upon torque being applied to the said head member to rotate it, with said pins of said base member projecting into a substance, a value of torque, substantially proportional to the viscosity of the substance is reached at which the base member beings to rotate at the same speed as the head member, Said value of torque being indicated by the position of the indicating means relative to the scale on said base member.
Claim 2
Independent Claim
222 words
A device for measuring the viscosity of a substance comprising a base member, a plurality of pins provided in and projecting from an outer surface of said base member, said base member being provided with a substantially central upwardly directed boss portion, an aperture provided in said boss portion, a head member being provided with, and rotatably mounted about, a downwardly depending substantially central shaft member, said shaft member being inserted within said aperture in said boss portion so as to rotatably locate said head member relative to said base member, a spring being provided and mounted between said base member and head member, said spring biasing the head member against rotation relative to said base member, indicating means being provided and associated with said head member so as to move with said head member, a scale being provided on said base member, the arrangement being such that upon torque being applied to the said head member to rotate it, with said pins of said base member projecting into a substance, a value of torque, substantially proportional to the viscosity of the substance is reached at which the base member beings to rotate at the same speed as the head member, Said value of torque being indicated by the position of the indicating means relative to the scale on said base member.
Claim 3
Dependent Claim
43 words
A device as claimed in claim 1 in which said spring is a linear spring fixedly mounted about said shaft member, said spring being provided at one end thereof with a projection which engages with an abutment member provided on said head member.
Claim 4
Dependent Claim
32 words
A device as claimed in claim 1 in which said base member is provided with a lower surface of a substantially frustro-conical configuration, said pins extending outwardly from the outer surface thereof.
Claim 5
Dependent Claim
28 words
A device as claimed in claim 1 in which said pins project outwardly and laterally from said base member and from a substantially downwardly directed peripheral edge thereof.
Claim 6
Independent Claim
215 words
A device for measuring the viscosity of a substance comprising a base member, a plurality of pins provided in and projecting from an outer surface of said base member, an upper head member being provided and rotatably mounted relative to said base member, a spring being provided and mounted between said base and said head member, said spring biasing the head member against rotation relative to said base member, rotating means being provided whereby said head member is rotatable relative to said base member, a pointer rotatably movable with said head member and extending outwardly from an edge of said head member so as to be movable adjacent a scale provided on an upper face of said base member, the arrangement being such that upon a torque being applied to said head member by movement of said rotating means, so as to rotate it, with said pins of said base member projecting into a substance, a value of torque substantially proportional to the viscosity of the substance is reached, at which the base member will rotate at substantially the same speed as the head member, said value of torque being determined by the position of the head member relative to said base member and being measured by the position of said pointer along said scale.
Claim 7
Independent Claim
215 words
A device for measuring the viscosity of a substance comprising a base member, a plurality of pins provided in and projecting from an outer surface of said base member, an upper head member being provided and rotatably mounted relative to said base member, a spring being provided and mounted between said base and said head member, said spring biasing the head member against rotation relative to said base member, rotating means being provided whereby said head member is rotatable relative to said base member, a pointer rotatably movable with said head member and extending outwardly from an edge of said head member so as to be movable adjacent a scale provided on an upper face of said base member, the arrangement being such that upon a torque being applied to said head member by movement of said rotating means, so as to rotate it, with said pins of said base member projecting into a substance, a value of torque substantially proportional to the viscosity of the substance is reached, at which the base member will rotate at substantially the same speed as the head member, said value of torque being determined by the position of the head member relative to said base member and being measured by the position of said pointer along said scale.
Claim 8
Independent Claim
197 words
A device for measuring the viscosity of a substance comprising a base member, a plurality of pins provided in and projecting from an outer surface of said base member, an upper head member being provided and rotatably mounted relative to said base member, a spring being provided and mounted between said base and said head member, said spring biasing the head member against rotation relative to said base member, a motor being provided whereby said head member is rotatable relative to said base member, a transducer which determines the angle of displacement of said head member relative to said base member being associated with said head member, the arrangement being such that upon a torque being applied to said head member by movement of said rotating means, so as to rotate it, with said pins of said base member projecting into a substance, a value of torque, substantially proportional to the viscosity of the substance is reached, at which the base member will rotate at substantially the same speed as the head member, said value of torque being determined by the position of the head member relative to said base member and being measured by said transducer.
Claim 9
Independent Claim
197 words
A device for measuring the viscosity of a substance comprising a base member, a plurality of pins provided in and projecting from an outer surface of said base member, an upper head member being provided and rotatably mounted relative to said base member, a spring being provided and mounted between said base and said head member, said spring biasing the head member against rotation relative to said base member, a motor being provided whereby said head member is rotatable relative to said base member, a transducer which determines the angle of displacement of said head member relative to said base member being associated with said head member, the arrangement being such that upon a torque being applied to said head member by movement of said rotating means, so as to rotate it, with said pins of said base member projecting into a substance, a value of torque, substantially proportional to the viscosity of the substance is reached, at which the base member will rotate at substantially the same speed as the head member, said value of torque being determined by the position of the head member relative to said base member and being measured by said transducer.
Claim 10
Dependent Claim
32 words
A device as claimed in claim 6 in which said base member is provided with a lower surface of a substantially frustro-conical configuration, said pins extending outwardly from the outer surface thereof.
Claim 11
Dependent Claim
28 words
A device as claimed in claim 6 in which said pins project outwardly and laterally from said base member and from a substantially downwardly directed peripheral edge thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |