Control system for elevator cage guide magnets
US4754849A · kind A · utility
30Cited by
0References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 12, 1987 |
| Grant date | Jul 5, 1988 |
| Priority date | — |
| Expiry date | Jun 12, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B7/044
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Continuous, vertically tensioned steel cables 31, 32 or straps 39, 40, 41 mounted in an elevator shaft 2 serve as tracking standards for air gap detectors 33, 34, 35 mounted to a passanger cage 5. The detector outputs differentially control electromagnet pairs 6, 7, 8 mounted on the cage and cooperable with vertical guide rails 1 to maintain the sensed air gaps at a constant, predetermined value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.