Patent US3629802A successfully refreshed from Google Patents.
US3629802A
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Conflicting phase error detector
Assignee: EAGLE SIGNAL CONTROLS CORP A CORP OF DE
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Filing: 1968-07-18
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Granted: 1971-12-21
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Expires: 1988-07-18
Abstract
Abstract A system for traffic signal controllers is provided to detect the occurrence of coincident command signals that would cause right-of-way signals to be displayed for conflicting or intersecting traffic lanes or traffic paths or courses. For such detection NOR logic means are provided with input connections to controller command signal output lines to produce an output when different right-of-way command signals are coincident. The output from the NOR logic means is employed to disconnect all right-ofway traffic lamps and to connect all caution lamps to an energy source through a flasher.
Inventors
- 👤 Larry K Clark
- 👤 Peter G Bartlett
- 👤 Frank W Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:58
CPC Classifications
G; G08; G08G; G08G1/00; G08G1/097
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
129 words
In a traffic control system for controlling traffic flow through an intersection of at least two conflicting traffic courses and having signal light means for, upon command by a command signal, displaying a right-of-way signal in one of said traffic courses and traffic signal control means for providing a said command signal for each traffic course for which a right-ofway signal is to be received; the improvement comprising: NOR logic means associated with conflicting traffic courses for providing an output signal indicative that said controller means has provided coincident command signals for causing right-of-way signals to be displayed for such conflicting traffic courses; and, means associated with the output of said NOR logic means for providing an error signal whenever said NOR logic means provides such an output signal.
Claim 2
Dependent Claim
129 words
In a traffic control system for controlling traffic flow through an intersection of at least two conflicting traffic courses and having signal light means for, upon command by a command signal, displaying a right-of-way signal in one of said traffic courses and traffic signal control means for providing a said command signal for each traffic course for which a right-ofway signal is to be received; the improvement comprising: NOR logic means associated with conflicting traffic courses for providing an output signal indicative that said controller means has provided coincident command signals for causing right-of-way signals to be displayed for such conflicting traffic courses; and, means associated with the output of said NOR logic means for providing an error signal whenever said NOR logic means provides such an output signal.
Claim 3
Dependent Claim
28 words
In a traffic control system the improvement as set forth in claim 1 including error indicating means responsive to a said error signal for providing an indication thereof.
Claim 4
Dependent Claim
41 words
In a traffic control system the improvement as set forth in claim 2 wherein said error indicating means includes a visual display means, and means for alternately, energizing and deenergizing said visual display means for the duration of said error signal.
Claim 5
Dependent Claim
42 words
In a traffic control system the improvement as set forth in claim 3 wherein said visual display means includes traffic signal light means for displaying a warning signal for each of said conflicting traffic courses for the duration of said error signal.
Claim 6
Dependent Claim
40 words
In a traffic control system the improvement as set forth in claim 2 wherein said error indicating means includes timing means responsive to a said error signal for timing a predetermined period of time and then providing a control signal.
Claim 7
Dependent Claim
47 words
In a traffic control system the improvement as set forth in claim 5 including bistable means having a normal first condition and a second condition in response to a said control signal, and error warning signal means responsive to said second condition for providing a warning signal.
Claim 8
Dependent Claim
37 words
In a traffic control system the improvement as set forth in claim 6 wherein said error warning signal means includes traffic signal light means for providing a said warning signal in each of said conflicting traffic courses.
Claim 9
Dependent Claim
26 words
In a traffic control system the improvement as set forth in claim 7 including reset means for resetting said bistable means to its normal first condition.
Claim 10
Dependent Claim
138 words
In a traffic control system for controlling traffic flow through an intersection of a plurality of pairs of conflicting traffic courses, each having signal light means associated therewith for, upon actuation by a command sigNal, displaying a right-of-way signal to the associated traffic course, and traffic signal control means for providing a said command signal for each of said traffic courses; the improvement comprising: solid-state NOR logic means associated with each pair of conflicting traffic courses for providing an output signal indicative that said controller means has provided coincident command signals for causing right-of-way signals to be displayed in both of said conflicting traffic courses; and, solid state logic means associated with the outputs of each of said NOR logic means for providing an error signal when any of said NOR logic means provides a said output signal.
Claim 11
Dependent Claim
138 words
In a traffic control system for controlling traffic flow through an intersection of a plurality of pairs of conflicting traffic courses, each having signal light means associated therewith for, upon actuation by a command sigNal, displaying a right-of-way signal to the associated traffic course, and traffic signal control means for providing a said command signal for each of said traffic courses; the improvement comprising: solid-state NOR logic means associated with each pair of conflicting traffic courses for providing an output signal indicative that said controller means has provided coincident command signals for causing right-of-way signals to be displayed in both of said conflicting traffic courses; and, solid state logic means associated with the outputs of each of said NOR logic means for providing an error signal when any of said NOR logic means provides a said output signal.
Claim 12
Dependent Claim
63 words
In a traffic control system the improvement as set forth in claim 1, having output logic means adapted activate an indicator, wherein the NOR logic means comprises a plurality of NOR gates, each having inputs from controller output lines for causing conflicting go signals, and NOR gate means having inputs from said first-mentioned NOR gates with output means to said output logic means.
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |