Chair height adjustment mechanism
US5234187A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 2, 1992 |
| Grant date | Aug 10, 1993 |
| Priority date | — |
| Expiry date | Jun 2, 2012 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47B2009/065
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
An adjustment mechanism for adjusting the height of a chair seat, table top or other item includes telescoping outer, intermediate and inner tubes. The outer tube is attached to a base. The inner tube is attached to a chair seat or other load. A drive extends the telescoping tubes to adjust the height of the load. In one form, the drive includes a flexible, substantially nonelastic tape having an end fixed to the inner tube and an end fixed to the outer tube. The tape engages or rides over a sheave supported on the intermediate tube. In another form, the drive includes a pair of racks and a pinion. A piston cylinder actuator is disposed within the inner tube. The actuator includes an extensible rod which causes relative movement between the inner and intermediate tubes and extension of the intermediate tube relative to the base through the drive tape or rack and pinion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.