Electricity: motive power systems – Positional servo systems – With particular 'error-detecting' means
Patent
1988-05-18
1990-02-27
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
With particular 'error-detecting' means
318648, 318 16, 455603, 307149, 414546, 414391, 187 12, 187 17, 212160, 182 2, B66B 906
Patent
active
049049160
ABSTRACT:
A stairway wheelchair lift includes a stationary motor drive unit, a mobile platform movable along a stairway and a user interface for receiving user-generated input commands. The mobile platform communicates with the motor drive unit through a continuously maintained broadbeam infrared communications link, while the motor drive unit communicates with the mobile platform through an intermittently established short range infrared link. The user interface communicates with the motor drive through a hard wired four conductor communicates link. The use of infrared communications links, together with the four conductor hard wired link, reduces overall system wiring, enhances ease of installation and improves overall system flexibility and economy. Microprocessor based micro-controllers, within the motor drive unit, the mobile platform and the user interface, permit system operation to be tailored in accordance with the operating constraints and requirements imposed by a particular stairway configuration.
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Gisske Edward T.
Prendergast, Sr. John F.
Ip Paul
Shoop Jr. William M.
The Cheney Company
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