Differential magnetic alignment of an elevator and a landing
US5831227A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 13, 1996 |
| Grant date | Nov 3, 1998 |
| Priority date | — |
| Expiry date | Dec 13, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B1/50
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An apparatus for determining if an elevator car is level with respect to a landing comprises: a first magnet disposed proximate to the landing; a second magnet disposed proximate to the landing; a sensor for providing a level signal in response to detecting a minimum flux region formed by the first and second magnets; and a processor for determining if the elevator is level with respect to the landing in response to the level signal. Each magnet has a first and second magnetic pole. The first and second magnets are adjacently aligned such that the first magnetic pole of the first magnet is adjacent to the first magnetic pole of the second magnet, and the second magnetic pole of the first magnet is adjacent to the second magnetic pole of the second magnet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.