Safety mechanism for preventing unintended motion in traction elevators
US4923055A · kind A · utility
57Cited by
7References
33Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 24, 1989 |
| Grant date | May 8, 1990 |
| Priority date | — |
| Expiry date | Jan 24, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B5/18
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A traction elevator includes a safety mechanism for preventing unintended motion of the car. A trigger, when armed, is positioned in the path of bosses on the drive sheave or another sheave, such that any unintended rotation of the sheave causes actuation of the trigger and the consequent tripping of an emergency brake. Preferably, the trigger is armed whenever the car is stopped at a landing, and is also selectively armed responsive to elevator overspeed detection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.