US3851324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Navigational reference instrument
Assignee: ALLEN R Inc
•
Filing: 1973-06-18
•
Granted: 1974-11-26
•
Expires: 1993-06-18
Abstract
Abstract An instrument for determining the rate of turn of a vehicle, and particularly marine craft, which includes a meter registering rate of turn responsive to a rate of turn gyroscope or gyro, and detector means sensing the speed of the gyroscope to produce an alarm signal when deterioration of gyro performance is detected before actual failure occurs because the speed is reduced below a given point.
Inventors
- 👤 Boer A De
- 👤 D Gleason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:55
CPC Classifications
G; G01; G01P; G01P1/00; G01P1/07; G01P1/08; G01P1/10; G01P1/103; G01C; G01C19/00; G01C19/02; G01C19/04; G01C19/06; G01C19/065; G01C19/42
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
140 words
A marine navigational reference instrument comprising a rate gyro, a meter responsive to said gyro indicating rate of turn, and detector means sensing the speed of the gyro and producing a warning signal when the speed is below a given point, wherein the gyro includes a squirrel cage induction motor having primary and secondary windings, said primary winding being center-tapped, means supplying a D.C. potential alternately across each half thereof, and a phase-splitting capacitor connected in series with the secondary winding, and wherein the detector means includes means producing a reference voltage, and a comparator amplifier receiving as one input a signal produced from the voltage across the phase-splitting capacitor and as another input a signal produced by said reference voltage, said amplifier producing an output when the input voltage from the phase-splitting capacitor is less than the reference voltage.
Claim 2
Dependent Claim
140 words
A marine navigational reference instrument comprising a rate gyro, a meter responsive to said gyro indicating rate of turn, and detector means sensing the speed of the gyro and producing a warning signal when the speed is below a given point, wherein the gyro includes a squirrel cage induction motor having primary and secondary windings, said primary winding being center-tapped, means supplying a D.C. potential alternately across each half thereof, and a phase-splitting capacitor connected in series with the secondary winding, and wherein the detector means includes means producing a reference voltage, and a comparator amplifier receiving as one input a signal produced from the voltage across the phase-splitting capacitor and as another input a signal produced by said reference voltage, said amplifier producing an output when the input voltage from the phase-splitting capacitor is less than the reference voltage.
Claim 3
Dependent Claim
158 words
A marine navigational reference instrument comprising a rate gyro, a meter responsive to said gyro indicating rate of turn, and detector means sensing the speed of the gyro and producing a warning signal when the speed is below a given point, wherein the gyro includes a squirrel cage induction motor having a primary and secondary windings, said primary winding being center-tapped, means supplying a D.C. potential alternately across each half thereof, and a phase-splitting capacitor connected in series with the secondary winding, and wherein the detector means includes means producing a D.C. reference voltage, means for rectifying the voltage across the phase-splitting capacitor to produce a D.C. voltage representing motor speed, a comparator amplifier receiving as one input the speed voltage and as another input the reference voltage to compare the voltages and produce an output signal when the speed voltage is less than the reference voltage, and indicator means responsive to the output of the comparator amplifier.
Claim 4
Dependent Claim
158 words
A marine navigational reference instrument comprising a rate gyro, a meter responsive to said gyro indicating rate of turn, and detector means sensing the speed of the gyro and producing a warning signal when the speed is below a given point, wherein the gyro includes a squirrel cage induction motor having a primary and secondary windings, said primary winding being center-tapped, means supplying a D.C. potential alternately across each half thereof, and a phase-splitting capacitor connected in series with the secondary winding, and wherein the detector means includes means producing a D.C. reference voltage, means for rectifying the voltage across the phase-splitting capacitor to produce a D.C. voltage representing motor speed, a comparator amplifier receiving as one input the speed voltage and as another input the reference voltage to compare the voltages and produce an output signal when the speed voltage is less than the reference voltage, and indicator means responsive to the output of the comparator amplifier.
Claim 5
Dependent Claim
151 words
A marine navigational reference instrument comprising a plurality of rate gyros, a detector means for each gyro sensing the speed thereof and producing a signal when the speed is below a given point, a gyro responsive meter indicating rate of turn, and switching means for selectively connecting one gyro to the meter, wherein each gyro includes a squirrel cage induction motor having primary and secondary windings, said primary winding being center-tapped, means supplying a D.C. potential alternately across each half thereof, and a phase-splitting capacitor connected in series with the secondary winding, and wherein each detector means includes means producing a reference voltage, and a comparator amplifier receiving as one input a signal produced from the voltage across the phase-splitting capacitor and as another input a signal produced by said reference voltage, said amplifier producing an output when the signal voltage from the phase-splitting capacitor is less than the reference voltage.
Claim 6
Dependent Claim
151 words
A marine navigational reference instrument comprising a plurality of rate gyros, a detector means for each gyro sensing the speed thereof and producing a signal when the speed is below a given point, a gyro responsive meter indicating rate of turn, and switching means for selectively connecting one gyro to the meter, wherein each gyro includes a squirrel cage induction motor having primary and secondary windings, said primary winding being center-tapped, means supplying a D.C. potential alternately across each half thereof, and a phase-splitting capacitor connected in series with the secondary winding, and wherein each detector means includes means producing a reference voltage, and a comparator amplifier receiving as one input a signal produced from the voltage across the phase-splitting capacitor and as another input a signal produced by said reference voltage, said amplifier producing an output when the signal voltage from the phase-splitting capacitor is less than the reference voltage.
Claim 7
Dependent Claim
168 words
A marine navigational reference instrument comprising a plurality of rate gyros, a detector means for each gyro sensing the speed thereof and producing a signal when the speed is below a given point, a gyro responsive meter indicating rate of turn, and switching means for selectively connecting one gyro to the meter, wherein each gyro includes a squirrel cage induction motor having primary and secondary windings, said primary winding being center-tapped, means supplying a D.C. potential alternately across each half thereof, and a phase-splitting capacItor connected in series with the secondary winding, and wherein each detector means includes means producing a D.C. reference voltage, means for rectifying the voltage across the phase-splitting capacitor to produce a D.C. voltage representing motor speed, a comparator amplifier receiving as one input the speed voltage and as another input the reference voltage to compare the voltages and produce an output signal when the speed voltage is less than the reference voltage, and indicator means responsive to the output of the comparator amplifier.
Claim 8
Dependent Claim
168 words
A marine navigational reference instrument comprising a plurality of rate gyros, a detector means for each gyro sensing the speed thereof and producing a signal when the speed is below a given point, a gyro responsive meter indicating rate of turn, and switching means for selectively connecting one gyro to the meter, wherein each gyro includes a squirrel cage induction motor having primary and secondary windings, said primary winding being center-tapped, means supplying a D.C. potential alternately across each half thereof, and a phase-splitting capacItor connected in series with the secondary winding, and wherein each detector means includes means producing a D.C. reference voltage, means for rectifying the voltage across the phase-splitting capacitor to produce a D.C. voltage representing motor speed, a comparator amplifier receiving as one input the speed voltage and as another input the reference voltage to compare the voltages and produce an output signal when the speed voltage is less than the reference voltage, and indicator means responsive to the output of the comparator amplifier.
Claim 9
Dependent Claim
173 words
A marine navigational reference instrument comprising an indicator head assembly and a power sensor assembly remotely located therefrom and interconnected therewith, said power sensor assembly including a rate gyro, and detector means for sensing the speed of the gyro to produce a signal when the speed is below a given point, said indicator head assembly including a meter responsive to said gyro indicating rate of turn, and signal means responsive to said detector means, wherein the gyro includes a squirrel cage induction motor having primary and secondary windings, said primary winding being center-tapped, means supplying a D.C. potential alternately across each half thereof, and a phase-splitting capacitor connected in series with the secondary winding, and wherein the detector means includes means producing a reference voltage, and a comparator amplifier receiving as one input a signal produced from the voltage level across the phase-splitting capacitor and as another input a signal produced by said reference voltage, said amplifier producing an output when the voltage level from the phase-splitting capacitor drops below a given point.
Claim 10
Dependent Claim
173 words
A marine navigational reference instrument comprising an indicator head assembly and a power sensor assembly remotely located therefrom and interconnected therewith, said power sensor assembly including a rate gyro, and detector means for sensing the speed of the gyro to produce a signal when the speed is below a given point, said indicator head assembly including a meter responsive to said gyro indicating rate of turn, and signal means responsive to said detector means, wherein the gyro includes a squirrel cage induction motor having primary and secondary windings, said primary winding being center-tapped, means supplying a D.C. potential alternately across each half thereof, and a phase-splitting capacitor connected in series with the secondary winding, and wherein the detector means includes means producing a reference voltage, and a comparator amplifier receiving as one input a signal produced from the voltage level across the phase-splitting capacitor and as another input a signal produced by said reference voltage, said amplifier producing an output when the voltage level from the phase-splitting capacitor drops below a given point.
Claim 11
Dependent Claim
190 words
A marine navigational reference instrument comprising an indicator head assembly and a power sensor assembly remotely located therefrom and interconnected therewith, said power sensor assembly including a rate gyro, and detector means for sensing the speed of the gyro to produce a signal when the speed is below a given point, said indicator head assembly including a meter responsive to said gyro indicating rate of turn, and signal means responsive to said detector means, wherein the gyro includes a squirrel cage induction motor having primary and secondary windings, said primary winding being center-tapped, means supplying a D.C. potential alternately across each half thereof, and a phase-splitting capacitor connected in series with the secondary winding, and wherein the detector means includes means producing a D.C. reference voltage, means for rectifying the voltage across the phase-splitting capacitor to produce a D.C. voltage representing motor speed, a comparator amplifier receiving as one input the speed voltage and as another input the reference voltage to compare the voltages and produce an output signal when the speed voltage is less than the reference voltage, and indicator means responsive to the output of the comparator amplifier.
Claim 12
Dependent Claim
190 words
A marine navigational reference instrument comprising an indicator head assembly and a power sensor assembly remotely located therefrom and interconnected therewith, said power sensor assembly including a rate gyro, and detector means for sensing the speed of the gyro to produce a signal when the speed is below a given point, said indicator head assembly including a meter responsive to said gyro indicating rate of turn, and signal means responsive to said detector means, wherein the gyro includes a squirrel cage induction motor having primary and secondary windings, said primary winding being center-tapped, means supplying a D.C. potential alternately across each half thereof, and a phase-splitting capacitor connected in series with the secondary winding, and wherein the detector means includes means producing a D.C. reference voltage, means for rectifying the voltage across the phase-splitting capacitor to produce a D.C. voltage representing motor speed, a comparator amplifier receiving as one input the speed voltage and as another input the reference voltage to compare the voltages and produce an output signal when the speed voltage is less than the reference voltage, and indicator means responsive to the output of the comparator amplifier.
Claim 13
Dependent Claim
198 words
A marine navigational reference instrument comprising an indicator head assembly and a power sensor assembly remotely located therefrom and interconnected therewith, said power sensor assembly including a plurality of rate gyros, and detector means for each gyro to sense the speed thereof and to produce a signal when the speed is below a given point, said indicator head assembly including a gyro responsive meter indicating rate of turn, and signal means responsive to the detector means of each gyro, and switching means on one of said assemblies for selectively energizing and connecting one of the gyros to said meter, wherein each gyro includes a squirrel cage induction motor having primary and secondary windings, said primary winding being center-tapped, means supplying a D.C. potential alternately across each half thereof, and a phase-splitting capacitor connected in series with the secondary winding, and wherein each detector means includes means producing a reference voltage, and a comparator amplifier receiving as one input a Signal produced from the voltage level across the phase-splitting capacitor and as another input a signal produced by said reference voltage, said amplifier producing an output when the voltage level from the phase-splitting capacitor drops below a given point.
Claim 14
Dependent Claim
198 words
A marine navigational reference instrument comprising an indicator head assembly and a power sensor assembly remotely located therefrom and interconnected therewith, said power sensor assembly including a plurality of rate gyros, and detector means for each gyro to sense the speed thereof and to produce a signal when the speed is below a given point, said indicator head assembly including a gyro responsive meter indicating rate of turn, and signal means responsive to the detector means of each gyro, and switching means on one of said assemblies for selectively energizing and connecting one of the gyros to said meter, wherein each gyro includes a squirrel cage induction motor having primary and secondary windings, said primary winding being center-tapped, means supplying a D.C. potential alternately across each half thereof, and a phase-splitting capacitor connected in series with the secondary winding, and wherein each detector means includes means producing a reference voltage, and a comparator amplifier receiving as one input a Signal produced from the voltage level across the phase-splitting capacitor and as another input a signal produced by said reference voltage, said amplifier producing an output when the voltage level from the phase-splitting capacitor drops below a given point.
Claim 15
Dependent Claim
215 words
A marine navigational reference instrument comprising an indicator head assembly and a power sensor assembly remotely located therefrom and interconnected therewith, said power sensor assembly including a plurality of rate gyros, and detector means for each gyro to sense the speed thereof and to produce a signal when the speed is below a given point, said indicator head assembly including a gyro responsive meter indicating rate of turn, and signal means responsive to the detector means of each gyro, and switching means on one of said assemblies for selectively energizing and connecting one of the gyros to said meter, wherein each gyro includes a squirrel cage induction motor having primary and secondary windings, said primary winding being center-tapped, means supplying a D.C. potential alternately across each half thereof, and a phase-splitting capacitor connected in series with the secondary winding, and wherein each detector means includes means producing a D.C. reference voltage, means for rectifying the voltage across the phase-splitting capacitor to produce a D.C. voltage representing motor speed, a comparator amplifier receiving as one input the speed voltage and as another input the reference voltage to compare the voltages and produce an output signal when the speed voltage is less than the reference voltage, and indicator means responsive to the output of the comparator amplifier.
Claim 16
Dependent Claim
215 words
A marine navigational reference instrument comprising an indicator head assembly and a power sensor assembly remotely located therefrom and interconnected therewith, said power sensor assembly including a plurality of rate gyros, and detector means for each gyro to sense the speed thereof and to produce a signal when the speed is below a given point, said indicator head assembly including a gyro responsive meter indicating rate of turn, and signal means responsive to the detector means of each gyro, and switching means on one of said assemblies for selectively energizing and connecting one of the gyros to said meter, wherein each gyro includes a squirrel cage induction motor having primary and secondary windings, said primary winding being center-tapped, means supplying a D.C. potential alternately across each half thereof, and a phase-splitting capacitor connected in series with the secondary winding, and wherein each detector means includes means producing a D.C. reference voltage, means for rectifying the voltage across the phase-splitting capacitor to produce a D.C. voltage representing motor speed, a comparator amplifier receiving as one input the speed voltage and as another input the reference voltage to compare the voltages and produce an output signal when the speed voltage is less than the reference voltage, and indicator means responsive to the output of the comparator amplifier.
References Cited (Backward Citations)
US3146433A
Cited
US3313984A
Cited
US3334342A
Cited
US3550104A
Cited
US3306558A
Cited
US3401549A
Cited
US3696363A
Cited
US3651402A
Cited
US3721973A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |