Method and apparatus for protecting a cylinder of an hydraulic elevator
US5076146A · kind A · utility
3Cited by
6References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 18, 1990 |
| Grant date | Dec 31, 1991 |
| Priority date | — |
| Expiry date | Jul 18, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B9/04
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Fluid is detected within a protective encasement of an hydraulic cylinder of an elevator by applying a low pressure to the interior of the encasement and sensing for the presence of fluid as a result of the application of the low pressure. If fluid is detected, a greater pressure is applied within the protective encasement to eliminate the detected fluid. The protective encasement, which may be pressurized, has a pressure input port, an evacuation port, and an evacuation tube which attaches to the fluid evacuation port and extends to a region within the encasement below the bottom of the cylinder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.