Safety device for elevator and rope slip detection method using drive sheave acceleration
US8297413B2 · kind B2 · utility
7Cited by
10References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 21, 2007 |
| Grant date | Oct 30, 2012 |
| Priority date | — |
| Expiry date | Mar 26, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B5/00
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
In a safety system for an elevator, a safety gear is mounted to a car, the safety gear being electrically operated by an actuator to cause the car to make an emergency stop regardless of whether a running direction of the car is upward or downward. A safety gear controller cuts power supply to a hoisting machine motor and causes the safety gear to make a braking operation upon detection of the slip between the drive sheave and the main rope based on a drive sheave acceleration exceeding a predetermined value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.