Remote monitoring of elevator cab lights
US6147620A · kind A · utility
5Cited by
7References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 30, 1999 |
| Grant date | Nov 14, 2000 |
| Priority date | — |
| Expiry date | Mar 30, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B5/0018
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
To sense the level of light in the passenger compartment 7 of an elevator cab 8, light at the proximal end of an optical fiber 4 is monitored by an optical detector 25 feeding a variable voltage divider 18, which allows setting a trip point at a desired level of light within the passenger compartment, thereby providing a signal indicating whether the light is adequate or not to a remote elevator monitoring apparatus 23. The trip point may be selected on installation by adjusting a potentiometer while watching an optical indication 17 of reaching the trip point, or it may be determined by software routines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.