Advanced energy saving hydraulic elevator
US5238087A · kind A · utility
8Cited by
6References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1992 |
| Grant date | Aug 24, 1993 |
| Priority date | — |
| Expiry date | Apr 30, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B17/12
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An hydraulic elevator utilizes a double acting cylinder to drive a counterweighted elevator upwardly and downwardly. The weight of the counterweight is approximately equal to the weight of the car plus 50% of the duty load of the elevator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.