Elevator controller
US4979593A · kind A · utility
88Cited by
9References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 17, 1988 |
| Grant date | Dec 25, 1990 |
| Priority date | — |
| Expiry date | Aug 17, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B9/00
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
In an elevator system comprising a machine room and an elevator car, as the elevator car moves along a hoistway between a plurality of floors, a radio system permits wireless communication between the machine room and the elevator car. As the elevator car moves along the hoistway, the distance between the elevator car and the machine room varies. To effect stable signal transmission and avoid receiver saturation when the elevator car is in close proximity to the machine room, the output of the transmitter or the sensitivity of the receiver is varied in accordance with the distance between the elevator car and the machine room.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.