Cushions
US4819288A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 4, 1987 |
| Grant date | Apr 11, 1989 |
| Priority date | — |
| Expiry date | Aug 4, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S297/01
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A foamed elastomeric seat cushion (10), especially for a wheelchair, has an overall upper part (20) supported by a lower part (30), the lower part rear portion (40) being formed by two like transversely spaced blocks (40a,40b), each block being of sandwich construction with front-to-rear upright layers, and higher density in an intermediate layer than the associated outer layers. These blocks extend forwardly to about the cushion middle, they extend similarly upwardly, they have about equal width with their mutual spacing, and they have layers of about equal thickness. The lower part front portion (50) can be formed with similar blocks (50a,50b), but with transversely directed layers and a smaller block spacing. The upper part can also be of multiple layers (21,22,23) with an increase in density for downwardly successive layers up to no more than the minimum density in the lower part.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.