Speed and direction indicator for elevator systems
US6161656A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 1, 1999 |
| Grant date | Dec 19, 2000 |
| Priority date | — |
| Expiry date | Feb 1, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B5/0087
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An elevator system includes an electronic driver which transmits a multi-phased electric current through a relay to a motor driving an elevator car. Under normal operating conditions, the motor uses the current from the driver to move the elevator car in a hoistway. When electric power fails, the elevator car is moved by gravity for any necessary rescue or maintenance operations, and consequently moves the motor. The movement of the motor generates a multi-phased electric current therein. The generated current is utilized to power a display panel of a movement indicator, which is automatically connected to the motor by the relay when power fails in the elevator system. The powered display panel informs the operator of the direction and speed of travel of the elevator car.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.