US3680366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Torsional oscillation device
Assignee: Lonza AG
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Filing: 1970-11-03
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Granted: 1972-08-01
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Expires: 1990-11-03
Abstract
Abstract A torsional oscillation device for testing plastics materials having a first clamp for gripping one end of a plastics material sample in a tempering chamber, and a second clamp for gripping the other end of the sample and rigidly connected to an oscillation body. The oscillation body, second clamp and the sample form a torsion pendulum in which oscillations are produced by a means through the oscillation body and a light transducer through a window in the oscillation body produces an electrical signal whose magnitude is dependent on the position of the oscillation body. The output of the transducer is connected to the actual-value input of a variable gain amplifier in a control device that drives a servo-motor which pivots the first clamp about the torsion pendulum axis. The nominal-value input of the control device corresponds to a predetermined relative position of the oscillation body and the part of the transducer not taking part in the pendulum oscillations.
Inventors
- 👤 Kurt Moser
- 👤 Beat Hochli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:18
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/32; G01N2203/00; G01N2203/0014; G01N2203/0021; G01N2203/02; G01N2203/022; G01N2203/0222
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
210 words
A torsional oscillation device for testing a sample of plastics material, comprising an oscillation body, a first gripping clamp for holding one end of the plastics material sample, a second gripping clamp rigidly connected to said oscillation body for holding the other end of the plastics material sample, heating means for the gripped plastics material sample, said oscillation body and the plastics material sample forming a torsion pendulum having an axis, means to produce free oscillations in the torsion pendulum, a transducer for producing an electrical signal the magnitude of which is dependent on the position of the oscillation body and having a part that does not take part in the pendulum oscillation, a servo-motor connected to pivot said first gripping clamp or the said transducer part about the axis of the torsion pendulum, amplifier means having an actual-value input and a nominal-value input, said amplifier means connected to energize said servo-motor, the electrical signal output of said transducer connected to said actual-valve input, and a control device supplying a control signal to said nominal-value input having a magnitude in the operating range of said transistor that corresponds to a predetermined relative position of said oscillation body and said part of the transistor not taking part in the pendulum oscillations.
Claim 2
Dependent Claim
210 words
A torsional oscillation device for testing a sample of plastics material, comprising an oscillation body, a first gripping clamp for holding one end of the plastics material sample, a second gripping clamp rigidly connected to said oscillation body for holding the other end of the plastics material sample, heating means for the gripped plastics material sample, said oscillation body and the plastics material sample forming a torsion pendulum having an axis, means to produce free oscillations in the torsion pendulum, a transducer for producing an electrical signal the magnitude of which is dependent on the position of the oscillation body and having a part that does not take part in the pendulum oscillation, a servo-motor connected to pivot said first gripping clamp or the said transducer part about the axis of the torsion pendulum, amplifier means having an actual-value input and a nominal-value input, said amplifier means connected to energize said servo-motor, the electrical signal output of said transducer connected to said actual-valve input, and a control device supplying a control signal to said nominal-value input having a magnitude in the operating range of said transistor that corresponds to a predetermined relative position of said oscillation body and said part of the transistor not taking part in the pendulum oscillations.
Claim 3
Dependent Claim
99 words
A device as claimed in claim 5, wherein the transducer comprises a first aperture fixedly connected with the oscillation body and participating in the pendulum movements, and a second aperture which does not participate in the pendulum movements, said first and second apertures partly registering at the nominal values of the control dimensions, a source of illumination on one side of said apertures, and a photo-electric member on the opposite side of said apertures adapted to be illuminated by said source of illumination through the apertures, and said photo-electric member connected with the actual-valve input of said amplifier means.
Claim 4
Dependent Claim
129 words
A device as claimed in claim 5, including half-wave rectifier means having a pair of output signals, said transducer connected to said half-wave rectifier means, a bi-stable multi-vibrator having two conditions connected for control by said pair of output signals, first storage means and second storage means connected for control by said bi-stable multi-vibrator which in response to one output signal of said pair is actuated to one of its two conditions to actuate said first storage means and in response to the other output signal of said pair is actuated to the other condition to actuate said second storage means, calculator means, and said first and second storage means connected to feed the signals stored therein to said calculator in order to calculate the damping of the oscillation.
Claim 5
Dependent Claim
55 words
A torsional oscillation device as set forth in claim 1, including means for measuring the period of oscillation of said torsion pendulum connected to said transducer, calculator means, and said oscillation period measuring means having an output signal connected to cOntrol said calculator means to calculate the shear modulus of the sample of plastics material.
References Cited (Backward Citations)
US3501952A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |