US3886406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overspeed control system for a vehicle
Assignee: SASIB SpA Bologna
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Filing: 1973-10-01
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Granted: 1975-05-27
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Expires: 1993-10-01
Abstract
Abstract An overspeed detector relay is governed by outputs of an oscillator and a tachometer frequency generator through a highpass filter and amplifier. A step-up transformer is provided having a primary winding energized by output of the amplifier, and control apparatus is provided for the detector relay including a full-wave rectifier connected across a resistor and a winding of the detector relay in series for energizing the detector relay by output of a secondary winding of the step-up transformer. This makes the detector relay quick to respond to de-energization since the shunting effect of the full-wave rectifier is reduced by the series resistor that serves to isolate the relay coil from the rectifier.
Inventors
- 👤 Robert F Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:00
CPC Classifications
B; B60; B60L; B60L3/00; B60L3/08; G; G01; G01P; G01P1/00; G01P1/07; G01P1/08; G01P1/10; G01P1/103
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
133 words
An overspeed control system for a vehicle having a detector relay controlled by outputs of an oscillator and a tachometer frequency generator through a high-pass filter and amplifier wherein the improvement comprises; a. a step-up transformer having a primary winding energized by output of the amplifier, b. control means including a full-wave rectifier connected across a resistor and a winding of the detector relay in series for energizing the detector relay by output of an independent secondary winding of the step-up transformer, c. the resistor having a resistance value several times the resistance of the detector relay winding, d. whereby the detector relay is quick to respond to deenergization since the shunting effect of the full-wave rectifier is reduced by the series resistor that serves to isolate the relay winding from the rectifier.
Claim 2
Dependent Claim
133 words
An overspeed control system for a vehicle having a detector relay controlled by outputs of an oscillator and a tachometer frequency generator through a high-pass filter and amplifier wherein the improvement comprises; a. a step-up transformer having a primary winding energized by output of the amplifier, b. control means including a full-wave rectifier connected across a resistor and a winding of the detector relay in series for energizing the detector relay by output of an independent secondary winding of the step-up transformer, c. the resistor having a resistance value several times the resistance of the detector relay winding, d. whereby the detector relay is quick to respond to deenergization since the shunting effect of the full-wave rectifier is reduced by the series resistor that serves to isolate the relay winding from the rectifier.
Claim 3
Dependent Claim
35 words
An overspeed control system according to claim 1 wherein; a. the oscillator generates a frequency above the frequency of the high-pass filter, and b. the control means normally pulses the oscillator and the detector relay.
Claim 4
Dependent Claim
30 words
An overspeed control system according to claim 2 wherein brake control means is provided for causing application of brakes of the vehicle upon cessation of pulsing of the detector relay.
Claim 5
Dependent Claim
23 words
An overspeed control system according to claim 1 wherein the step-up transformer has a center-tapped primary winding included in a push-pull amplifier circuit.
References Cited (Backward Citations)
US2762464A
Cited
US3660731A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |