STREET TRAFFIC SIGNALLING SYSTEM
First Claim
1. In a street traffic signalling system in which the signal light units for the traffic flow in each direction at an intersection are independently regulated under the control of a central programmer at a main station with the signal unit for each such traffic flow being controlled over a respective individual channel, the combination of an actuating switch, controlled by said programmer, for each channel at such main station, operative to transmit order signals to the associated unit, time switches, for the respective units, in the form of impulse counters adapted to be triggered in response to an order signal resulting from actuation of the cooperable actuating switch, a timing generator connected in common to the respective impulse counters of an intersection for supplying impulses thereto, said timing generator being connected to receive synchronizing impulses, from the main station, at selected time intervals, whereby such generator is periodically synchronized, for example, once per signalling cycle, said timing generator including means for effecting a phase-shifting of the timing impulses upon the initiation of an order signal from the main station, for preventing improper operation of the system and false indications in a test device.
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Abstract
A street traffic signalling system in which the signal light units for each traffic flow of an intersection are independently regulated under the control of a central programmer with the signal unit for each traffic flow being controlled over a respective individual channel, by means of an actuating switch cooperable with and adapted to trigger respective time switches in the form of impulse counters, in combination with a timing generator which is common to the impulse counters of an intersection, which timing generator is periodically synchronized from the central station through synchronizing impulses at selected time intervals, for example, once per signalling cycle, and in which the impulses of the timing generator are sufficiently phase-shifted at the initiation of an order signal from the main station to prevent improper operation of the system and false indications in a test device.
18 Citations
3 Claims
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1. In a street traffic signalling system in which the signal light units for the traffic flow in each direction at an intersection are independently regulated under the control of a central programmer at a main station with the signal unit for each such traffic flow being controlled over a respective individual channel, the combination of an actuating switch, controlled by said programmer, for each channel at such main station, operative to transmit order signals to the associated unit, time switches, for the respective units, in the form of impulse counters adapted to be triggered in response to an order signal resulting from actuation of the cooperable actuating switch, a timing generator connected in common to the respective impulse counters of an intersection for supplying impulses thereto, said timing generator being connected to receive synchronizing impulses, from the main station, at selected time intervals, whereby such generator is periodically synchronized, for example, once per signalling cycle, said timing generator including means for effecting a phase-shifting of the timing impulses upon the initiation of an order signal from the main station, for preventing improper operation of the system and false indications in a test device.
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2. A street traffic signalling system according to claim 1, wherein there is provided an additional individual channel over which said synchronizing impulses are transmitted to said timing generator.
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3. A street traffic signalling system according to claim 1, wherein said timing generator is connected to be responsive to the leading edge of an order signal as the synchronizing impulse.
Specification
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Current AssigneeAnton Obermaier, Johann Hoisl, Peter Drebinger
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Original AssigneeAnton Obermaier, Johann Hoisl, Peter Drebinger
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InventorsDrebinger, Peter, Obermaier, Anton, Hoisl, Johann
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Primary Examiner(s)Cooper, William C.
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Assistant Examiner(s)Myers, Randall P.
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Application NumberUS05/369,725Time in Patent Office643 DaysField of Search340/40,41R,35,36US Class Current340/909CPC Class CodesG08G 1/081 Plural intersections under ...
