Mattress support mechanism for folding sofa-bed
US4504987A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 25, 1983 |
| Grant date | Mar 19, 1985 |
| Priority date | — |
| Expiry date | Jan 25, 2003 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47C19/027
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A folding sofa-bed or the like structure having a plurality of frame sections including a body section, pivotally interconnected in end-to-end relation for movement into an extended planar position to form a bed, and into a folded position to form a sofa-seat, and wherein the frame section and the body section in particular are provided with a flexible mattress supporting fabric having springs normally biasing the fabric and limiting it to a predetermined amount of sag under the weight of an occupant. Further sag control is obtained by utilizing one or more substantially rigid elongate transversely extending members which are normally supported by springs in a relatively relaxed and inactive position underlying the fabric of the body section, when the frame sections are in a seat forming position, but which are activated by a control linkage, responsive to movement of the frame sections to a bed forming position, whereby the rigid members will be moved into engagement with the mattress supporting fabric of the body section and its support springs stressed so as to provide a taut and more firm mattress support and thereby reduce the sag produced by the weight of the occupant, and te…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.