Seat adjustment mechanism for a chair
US4494721A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 3, 1983 |
| Grant date | Jan 22, 1985 |
| Priority date | — |
| Expiry date | Feb 3, 2003 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47C3/18
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A seat adjustment mechanism for adjustably connecting a seat to a chair base is provided wherein a threaded spindle is secured to the seat and rotatably and axially movably received within a column member extending upwardly from the chair base. An adjusting nut is threadedly engaged with the spindle and supported within the column member by a bearing assembly, and which is upwardly urged by a compression spring such that the upper surface of the adjusting nut lockingly engages a downwardly facing engaging surface of a lock cap in the column member when the seat is unoccupied. By rotating the seat and the spindle secured thereto, vertical adjustment of the seat is provided. When the seat is occupied, the adjusting nut is moved downwardly by the spindle and against the bearing assembly to compress the spring and disengage the upper surface of the adjusting nut from the downwardly facing engaging surface. The seat and spindle then may be rotated without being vertically adjusted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.