Tested and redundant elevator emergency terminal stopping capability
US5407028A · kind A · utility
27Cited by
10References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1993 |
| Grant date | Apr 18, 1995 |
| Priority date | — |
| Expiry date | Apr 28, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B5/10
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
The main relay that controls power to an elevator motor and brake lift coil is dropped by an electronic emergency stop relay contact placed in series with the elevator safety chain in the event that the speed and position indications in the elevator controller do not agree with the indications of the emergency terminal stopping speed and zone relays, or if the elevator controller indicates the elevator is going too fast when within the emergency terminal stopping zone. Various parts of the safety chain are cycled off when the elevator is at a landing in order to check the safety circuits and main power relays.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.