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US3866535A
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US
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Fluidic free flight sensor
Assignee: United States Department of the Air Force
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Filing: 1974-01-17
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Granted: 1975-02-18
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Expires: 1994-01-17
Abstract
Abstract A free flight sensor adapted for use in munitions utilizing ram air power to operate a mechanical safing means, sensing vertical velocity with a pitot-static pressure system and a two-axis fluidic accelerometer to sense vertical acceleration.
Inventors
- 👤 James O Hedeen
- 👤 Harvey D Ogren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:10
CPC Classifications
F; F42; F42C; F42C15/00; F42C15/28; F42C15/29; F42C11/00; F42C11/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
100 words
A fluidic free flight sensor for air dropped munition fuses comprising: means for allowing ram air to enter the sensor; means for allowing static air to enter the sensor; means connected to said ram air means and said static air means for determining a differential pressure; and acitvating means connected to the differential pressure determining means; a two axis accelerometer means connected to the activating means, and a mechanical actuator means connected to the activating means output to cause the said mechanical actuator to function when preset conditions are met in the differential pressure determining means and the accelerometer means.
Claim 2
Dependent Claim
100 words
A fluidic free flight sensor for air dropped munition fuses comprising: means for allowing ram air to enter the sensor; means for allowing static air to enter the sensor; means connected to said ram air means and said static air means for determining a differential pressure; and acitvating means connected to the differential pressure determining means; a two axis accelerometer means connected to the activating means, and a mechanical actuator means connected to the activating means output to cause the said mechanical actuator to function when preset conditions are met in the differential pressure determining means and the accelerometer means.
Claim 3
Dependent Claim
24 words
A fluidic free flight sensor for air dropped muniTion fuses according to claim 1 wherein the two axis accelerometer is fluidic cavity-ball sensing accelerometer.
Claim 4
Dependent Claim
27 words
A fluidic fee flight sensor for air dropped munition fuses according to claim 1 wherein the activating means is a fluidic logic circuit and resistance-capacitor integrator circuit.
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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |