US3681980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oscillating disk rheometer
Assignee: Monsanto Co
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Filing: 1970-08-26
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Granted: 1972-08-08
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Expires: 1990-08-26
Abstract
Abstract Method and apparatus for determining the rheological properties of an elastomer which method comprises subjecting a sample of the elastomer enclosed under pressure in a non-circular chamber, the base of which is star-shaped or rectangular, to oscillating shearing stress and measuring the stress. Dynamic properties are determined by enclosing a sample of the elastomer under pressure in a chamber, subjecting it to oscillating shearing stress at high frequency to provide measurable difference in phase between stress and displacement, measuring the torque required to impose the shearing stress and simultaneously measuring displacement.
Inventors
- 👤 George E Decker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:30
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/32; G01N3/34; G01N11/00; G01N11/10; G01N11/16; G01N11/162; G01N2203/00; G01N2203/0014; G01N2203/0016; G01N2203/0019; G01N2203/0021; G01N2203/02; G01N2203/022; G01N2203/0222
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
75 words
A measuring apparatus comprising test material enclosing means which include a non-circular chamber the base of which is star shaped or rectangular, an oscillatory disk within the chamber in fixed relative position with clearance therebetween to provide a volume of test material which cannot rotate, means for maintaining the test material under pressure in the chamber, means for rotatively oscillating the disk therein and a stress transducer to measure torque required to oscillate the disk.
Claim 2
Dependent Claim
75 words
A measuring apparatus comprising test material enclosing means which include a non-circular chamber the base of which is star shaped or rectangular, an oscillatory disk within the chamber in fixed relative position with clearance therebetween to provide a volume of test material which cannot rotate, means for maintaining the test material under pressure in the chamber, means for rotatively oscillating the disk therein and a stress transducer to measure torque required to oscillate the disk.
Claim 3
Dependent Claim
74 words
In a measuring apparatus an oscillator, drive means connected to the oscillator, relatively movable stator sections closing about said oscillator in fixed cuboid relation thereto defining a cuboid test material enclosure, means for maintaining the test material under continuous confining pressure in the enclosure, force means connected to the drive means to mechanically oscillate the oscillator and impose oscillating shearing force on the test material and means to measure the force required for oscillation.
Claim 4
Dependent Claim
74 words
In a measuring apparatus an oscillator, drive means connected to the oscillator, relatively movable stator sections closing about said oscillator in fixed cuboid relation thereto defining a cuboid test material enclosure, means for maintaining the test material under continuous confining pressure in the enclosure, force means connected to the drive means to mechanically oscillate the oscillator and impose oscillating shearing force on the test material and means to measure the force required for oscillation.
Claim 5
Dependent Claim
63 words
A measuring apparatus comprising test material enclosing means which include a cuboid chamber, an oscillatory disk within the chamber in fixed relative position with clearance therebetween to provide enclosed volume of test material, means for maintaining the test material under pressure in the chamber, means for rotatively oscillating the disk therein and a stress transducer to measure torque required to oscillate the disk.
Claim 6
Dependent Claim
63 words
A measuring apparatus comprising test material enclosing means which include a cuboid chamber, an oscillatory disk within the chamber in fixed relative position with clearance therebetween to provide enclosed volume of test material, means for maintaining the test material under pressure in the chamber, means for rotatively oscillating the disk therein and a stress transducer to measure torque required to oscillate the disk.
Claim 7
Dependent Claim
98 words
Apparatus for measuring loss angle of an elastomer which comprises means for subjecting a volume of elastomer under pressure to shearing stress imparted by an oscillator embedded within the elastomer, means for measuring the torque required to move the oscillator, means for simultaneously therewith measuring the displacement of the oscillator, means for converting torque and displacement into electrical signals and a calibrated resistance-capacitance phase shift network for measuring the shift in phase required to bring the torque signal into phase with the displacement signal by varying the resistance thereof until the torque and displacemEnt signals are in phase.
Claim 8
Dependent Claim
98 words
Apparatus for measuring loss angle of an elastomer which comprises means for subjecting a volume of elastomer under pressure to shearing stress imparted by an oscillator embedded within the elastomer, means for measuring the torque required to move the oscillator, means for simultaneously therewith measuring the displacement of the oscillator, means for converting torque and displacement into electrical signals and a calibrated resistance-capacitance phase shift network for measuring the shift in phase required to bring the torque signal into phase with the displacement signal by varying the resistance thereof until the torque and displacemEnt signals are in phase.
Claim 9
Dependent Claim
94 words
Apparatus for measuring the loss angle of an elastomer which comprises means for subjecting a fixed volume of elastomer to shearing stress imparted by an oscillator embedded within the elastomer, means for transducing the torque required to move the oscillator into an electrical signal, means for simultaneously therewith transducing the displacement of the oscillator into an electrical signal, means for amplifying both the torque and displacement signals, a resistance-capacitance phase-shift network, means for displaying the amplified displacement signal and means for adjusting the phase-shift network to maintain a straight line on the display means.
Claim 10
Dependent Claim
94 words
Apparatus for measuring the loss angle of an elastomer which comprises means for subjecting a fixed volume of elastomer to shearing stress imparted by an oscillator embedded within the elastomer, means for transducing the torque required to move the oscillator into an electrical signal, means for simultaneously therewith transducing the displacement of the oscillator into an electrical signal, means for amplifying both the torque and displacement signals, a resistance-capacitance phase-shift network, means for displaying the amplified displacement signal and means for adjusting the phase-shift network to maintain a straight line on the display means.
Claim 11
Dependent Claim
68 words
Method of measuring the rheological properties of solid elastomeric material which comprises enclosing a sample of the material under pressure in a non-circular chamber the base of which is star shaped or rectangular while subjecting the enclosed material to rotary oscillating shearing stress through an angle of rotation below that corresponding to the ultimate elongation of the test material and measuring the torque required to move the oscillator.
Claim 12
Dependent Claim
68 words
Method of measuring the rheological properties of solid elastomeric material which comprises enclosing a sample of the material under pressure in a non-circular chamber the base of which is star shaped or rectangular while subjecting the enclosed material to rotary oscillating shearing stress through an angle of rotation below that corresponding to the ultimate elongation of the test material and measuring the torque required to move the oscillator.
Claim 13
Dependent Claim
30 words
The method of claim 6 wherein the chamber in which the elastomeric material is enclosed is cuboid and the shearing stress is applied by an oscillator embedded within the material.
Claim 14
Dependent Claim
99 words
Method of determining the curing characteristics of solid elastomeric material which comprises curing a sample of the material enclosed under pressure in a cuboid chamber about 2 inches on each side and about 0.5 inch high while subjecting the enclosed material to rotary oscillating shearing stress by an oscillating disk of about 1.5 inch diameter embedded within the material of low frequency such that effect of the viscous component of the elastomer is minimized and through an angle of rotation below that corresponding to the ultimate elongation of the material and measuring the torque required to oscillate the disk.
Claim 15
Dependent Claim
99 words
Method of determining the curing characteristics of solid elastomeric material which comprises curing a sample of the material enclosed under pressure in a cuboid chamber about 2 inches on each side and about 0.5 inch high while subjecting the enclosed material to rotary oscillating shearing stress by an oscillating disk of about 1.5 inch diameter embedded within the material of low frequency such that effect of the viscous component of the elastomer is minimized and through an angle of rotation below that corresponding to the ultimate elongation of the material and measuring the torque required to oscillate the disk.
Claim 16
Dependent Claim
96 words
Method of measuring the dynamic properties of solid elastomeric material which comprises curing a sample of the material enclosed under pressure in a cuboid chamber while subjecting the enclosed material to rotary oscillating shearing stress by an oscillating disk embedded within the material oscillating at high frequency to provide measurable difference in phase between stress and displacement and through an angle of rotation below that corresponding to the ultimate elongation of the material, measuring the torque required to oscillate the disk, simultaneously measuring displacement of the disk and determining phase angle or a component of torque.
Claim 17
Dependent Claim
96 words
Method of measuring the dynamic properties of solid elastomeric material which comprises curing a sample of the material enclosed under pressure in a cuboid chamber while subjecting the enclosed material to rotary oscillating shearing stress by an oscillating disk embedded within the material oscillating at high frequency to provide measurable difference in phase between stress and displacement and through an angle of rotation below that corresponding to the ultimate elongation of the material, measuring the torque required to oscillate the disk, simultaneously measuring displacement of the disk and determining phase angle or a component of torque.
Claim 18
Dependent Claim
93 words
Method of measuring the dynamic properties of solid vulcanizable elastomeric material during vulcanization thereof which comprises enclosing a sample of the material under pressure in a chamber, subjecting the enclosed material to vulcanizing conditions and during the vulcanization to rotary oscillating shearing stress at high frequency to provide measurable differences in phase between stress and displacement and through an angle of rotation below that corresponding to the ultimate elongation of the material, measuring the torque required to impose the shearing stress, simultaneously measuring displacement and determining phase angle or a component of torque.
Claim 19
Dependent Claim
93 words
Method of measuring the dynamic properties of solid vulcanizable elastomeric material during vulcanization thereof which comprises enclosing a sample of the material under pressure in a chamber, subjecting the enclosed material to vulcanizing conditions and during the vulcanization to rotary oscillating shearing stress at high frequency to provide measurable differences in phase between stress and displacement and through an angle of rotation below that corresponding to the ultimate elongation of the material, measuring the torque required to impose the shearing stress, simultaneously measuring displacement and determining phase angle or a component of torque.
Claim 20
Dependent Claim
14 words
The method of claim 10 wherein the frequency is about 852 cycles per minute.
References Cited (Backward Citations)
US2948147A
Cited
US3182494A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |