Chair having a leaf spring with a fulcrum point that moves to shorten a working length of the leaf spring and increase resistance to tilting of a backrest portion of the chair relative to a column portion of the chair
US11744373B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 2023 |
| Grant date | Sep 5, 2023 |
| Priority date | — |
| Expiry date | Jan 31, 2043 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47C31/126
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
Disclosed herein is a chair that includes a backrest portion, a seat portion coupled with the backrest portion, a column portion coupled with the seat portion, a linkage coupled with the backrest portion, a leaf spring in direct contact with the linkage, an arc-shaped toothed structure fixed translationally relative to the column portion, and a different toothed structure in contact with the arc-shaped toothed structure. The chair is also configured such that when a weight is applied to the seat portion, a fulcrum point of the leaf spring moves as the different toothed structure moves along the arc-shaped toothed structure to thereby shorten a working length of the leaf spring and provide an increased resistance to tilting of the backrest portion relative to the column portion. A process for assembling the chair and a weight-based tilt-resistance assembly for use with the chair are also described herein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.