Elevator system
US4013993A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 1976 |
| Grant date | Mar 22, 1977 |
| Priority date | — |
| Expiry date | Mar 22, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F9/35
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An elevator system including an elevator car mounted for movement in a building to serve the floors therein. The elevator car includes a car call station with a continuously energized light source associated with certain display functions. An emergency source of electrical potential is applied to this light source when the normal source of electrical potential fails, and this light source provides emergency lighting for the elevator car by providing light transmitting portions on the car call station panel and/or by operating electro-optic light valves located on the car call entry station to their light transmitting condition. The electro-optic light valves used for the emergency lighting function may be those utilized for other display purposes during normal operation of the car call entry station, and/or light valves which are only operated during use of the emergency source of electrical potential.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.