Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1996-04-02
1999-08-03
Swann, Glen
Communications: electrical
Condition responsive indicating system
Specific condition
2503381, 2503412, 250395, 340540, 340573, 340600, 34082519, 356256, G08B 2100
Patent
active
059330821
ABSTRACT:
The device assists those who are visually handicapped and, in particular, warns blind or visually impaired travellers that they have entered a potentially dangerous area proximal to the edge of boarding platforms of the type typically found in public railway transit systems. An InfraRed Integrated Information System consists of an array of infrared transmitters and a portable detector/warning device to be held by the blind traveller. The transmitters create a beam of infrared light which bathes the section of the platform proximal to the platform edge. As the traveller moves into the region of the platform covered by the emission, the sensors in the warning device are activated and by audio, tactile or other stimuli alert the traveller of entry into the danger zone.
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patent: 4712003 (1987-12-01), Ban et al.
patent: 4947152 (1990-08-01), Hodges
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patent: 5266807 (1993-11-01), Neiger
Abita Joseph Lawrence
Massof Robert W.
Sadowsky John
Schneider Wolfger
Krivak Carla Magda
Pawlikowski Eugene J.
Swann Glen
The Johns Hopkins University
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