Hydraulic lifting mechanism for a chair or the like using a two phase working fluid
US4592590A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 1985 |
| Grant date | Jun 3, 1986 |
| Priority date | — |
| Expiry date | Aug 29, 2005 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47C3/30
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydraulic lifting mechanism for an article of furniture including a refrigerant containing reservoir. The mechanism includes a flexible bag having a variable volume and fixed volume reservoir including a diaphragm for dividing the reservoir into two chambers. The first chamber contains hydraulic liquid and the second chamber contains a compressed two phase working fluid. The hydraulic liquid may be transferred between the flexible bag and the first chamber. A control valve mechanism is included in the flexible conduit which connects the flexible bag with the first chamber. The mechanism may be used in combination with a chair to provide an adjustable height control for the seat of the chair or in combination with other articles of furniture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.