Electromechanical control for hydraulic elevators
US4418794A · kind A · utility
12Cited by
2References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 11, 1982 |
| Grant date | Dec 6, 1983 |
| Priority date | — |
| Expiry date | Mar 11, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B1/285
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
In a hydraulic elevator, in which fluid is pumped to and from a tank into a piston to raise and lower the car, the flow of fluid is controlled by an apparatus which includes an electric motor that opens and closes a single valve to control the motion profile of the elevator car.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.