Coil spring mattress core
US4811932A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 6, 1987 |
| Grant date | Mar 14, 1989 |
| Priority date | — |
| Expiry date | Jul 6, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47C27/001
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A mattress core particularly useful in a sofa bed has a plurality of rows of coil springs extending longitudinally of the coil in the head to foot direction thereof. A plurality of coiled spring wires extend transversely of the rows while interconnecting adjacent coil springs in each row and adjacent coil springs of adjacent rows by being wound about the coil springs. The coiled spring wires are located on opposite sides of the core. On only one side of the core which forms the sleep surface are a plurality of transversely extending "torsion" spring wires, however, these wires are of a generally rectilinear shape with intermediate offset portions at intervals extending generally along the head to foot direction while being connected to the coil springs of each of the rows. The offset portions provide torsion arms providing torsional resistance to deflection at the sleep surface to thereby increase resistance to deflection while, at the same time, distributing loads across the sleep surface. The bottom side of the core opposite the sleep surface does not have the torsion wires and is therefore more flexible than the spring surface to facilitate compression of the core when moved int…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.