Suspension arrangement for a tilting chair
US4575150A · kind A · utility
67Cited by
5References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 13, 1984 |
| Grant date | Mar 11, 1986 |
| Priority date | — |
| Expiry date | Apr 13, 2004 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47C1/03274
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A suspension arrangement for a chair of the type wherein a back and seat of the chair pivot conjointly but two different angles comprises a pair of main helical torsion springs spaced axially and supporting the back support relative to a main frame so that the back support can pivot about the axes of the springs. The seat is attached to the main frame by a forward pair of helical springs and to the back support by a rearward pair of helical springs so that the seat pivots about the front pair under control of the rear pair with the ratio of the angles controlled by the distance between the axes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.