Chairs with foldable backs
US4881776A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 22, 1988 |
| Grant date | Nov 21, 1989 |
| Priority date | — |
| Expiry date | Nov 22, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T403/32409
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A chair structure has a lower chair seat section and an upper chair back section. The chair back section has a U-shaped upper back frame member and two lower back frame members. Each of the lower back frame members is connected to the upper back frame member by an upper connector and a lower connector which are respectively secured to the upper back frame member and the lower back frame member. The upper and lower connectors are rotatably interconnected by a pivot member and releasably interlocked by a lock mechanism. The lock mechanism may be either a spring biased ball unit or a nut and bolt unit. When the lock mechanism is released, the upper back frame member may be folded to rest on the lower back frame members.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.