Elevator safety device
US5637842A · kind A · utility
3Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1994 |
| Grant date | Jun 10, 1997 |
| Priority date | — |
| Expiry date | Nov 30, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B5/10
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An elevator safety device in which a counterweight cam is attached to the counterweight and top terminal landing final limit switches are disposed below the bottom terminal landing of the hoistway so that it is operated by the counterweight cam. The top terminal landing final limit switches only need to be provided in accordance with the counterweight buffer stroke, regardless of to what extent the car has been flung upward, with the result that fewer final limit switches are required.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.