Hydraulic elevator having a counterweight
US5901814A · kind A · utility
4Cited by
6References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 28, 1996 |
| Grant date | May 11, 1999 |
| Priority date | — |
| Expiry date | Oct 28, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B9/04
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A hydraulic elevator includes a hydraulic ram and a counterweight that are directly roped. The hydraulic ram includes a single-acting cylinder, piston and yoke that are placed within the hoistway adjacent to the path of motion of an elevator car. The counterweight is positioned adjacent to the hydraulic ram and on the same side of the car as the hydraulic ram. The combination of the directly counterweighted hydraulic ram and the arrangement of the hydraulic ram, counterweight and car results in minimal power and space requirements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.