Chair control for a pedestal chair having a knee-tilt seat
US4906045A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 20, 1989 |
| Grant date | Mar 6, 1990 |
| Priority date | — |
| Expiry date | Mar 20, 2009 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47C7/448
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A chair control for a pedestal chair having a knee-tilt seat. An elastomeric torsion spring is offset rearwardly from the tilting axis of the seat. The seat and torsion spring are operatively connected by a cam surface and a cam follower which effectively reduce the restoring force exerted by the torsion spring against the seat as the rearward tilt of the seat increases. A mechanism to adjust the initial restoring torque of the torsion spring provides a large angular twist of the torsion spring with a minimum linear movement of the mechanism. The chair control provides the chair seat with a less than conventional seat angle relative to the horizontal when the chair is unoccupied. A mechanism is provided to enable the occupant to adjust the chair seat to a more conventional seat angle in its unoccupied condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.