Method and detection system for monitoring the speed of an elevator car
US7775329B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 14, 2006 |
| Grant date | Aug 17, 2010 |
| Priority date | — |
| Expiry date | Feb 11, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B1/32
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A method and detection system monitors the speed of an elevator car and, in case of excess speed caused by brake failure of a motor brake or shaft fracture of a drive pulley shaft, a safety circuit is opened and the detection system is transferred from a normal operational state (State 1) to a retardation state (State 2) in which it is monitored whether the elevator car is retarded after defined speed presets. After a successful retardation, the detection system is transferred to a state of standstill monitoring (State 3) in which it is monitored whether the elevator car leaves its standstill position. If the presets of State 2 or State 3 are not fulfilled, the detection system is transferred to a braking state of the brake (State 4) in which a brake which fixes the elevator car is activated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.