US3761693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic maximum-torque indicator associated with a shaft and its use in helicopters
Assignee: Airbus Group SAS
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Filing: 1972-03-30
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Granted: 1973-09-25
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Expires: 1992-03-30
Abstract
Abstract A torque indicating system for the aerofoils of a helicopter comprising a pressure and temperature detector feeding, through appropriate electrical circuits, a multiplier operating a pointer.
Inventors
- 👤 G Fleury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:31
CPC Classifications
G; G01; G01L; G01L3/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
111 words
A calculating device for giving an approximation of the maximum torque which can be provided by a turbomotor driving the aerofoil of a helicopter comprising: a pressure detector providing a D.C. low-impedance output voltage p corresponding to the ambient pressure; a temperature detector providing a low-impedance output voltage t corresponding to the ambient temperature; a function synthesizer receiving said voltage t and providing a voltage corresponding to k. f(t), k being a constant and f(t) a transfer function experimentally determined; an electronic multiplier having two inputs respectively connected to the output of said pressure detector and said function synthesizer and a servomotor driven indicator connected to the output of said multiplier.
Claim 2
Dependent Claim
111 words
A calculating device for giving an approximation of the maximum torque which can be provided by a turbomotor driving the aerofoil of a helicopter comprising: a pressure detector providing a D.C. low-impedance output voltage p corresponding to the ambient pressure; a temperature detector providing a low-impedance output voltage t corresponding to the ambient temperature; a function synthesizer receiving said voltage t and providing a voltage corresponding to k. f(t), k being a constant and f(t) a transfer function experimentally determined; an electronic multiplier having two inputs respectively connected to the output of said pressure detector and said function synthesizer and a servomotor driven indicator connected to the output of said multiplier.
Claim 3
Dependent Claim
29 words
A calculating device according to claim 1 wherein the D.C. output voltages of said pressure and temperature detectors are respectively transmitted via a very-low-pass filter and a linear amplifier.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |