Elevator sheave brake safety
US4977982A · kind A · utility
16Cited by
6References
31Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 26, 1989 |
| Grant date | Dec 18, 1990 |
| Priority date | — |
| Expiry date | Dec 26, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B5/185
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
The cable drive sheave (14) carries a wedge-shaped brake ring (44) engageable with V-shaped brake shoes (52, 58). Each shoe is spring biased (68, 76) tangentially toward the ring and resiliently supported and biased radially (50) toward the ring. The shoes are restrained (84) during normal elevator operation and released on either cab upward overspeed (22) or on cab movement from a landing with the doors open (32).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.