Seat cushion
US5294181A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 1992 |
| Grant date | Mar 15, 1994 |
| Priority date | — |
| Expiry date | Jan 21, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S297/01
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A seat cushion is described which has particular utility as a wheelchair seat cushion. The seat cushion includes a base layer of polyurethane foam with a front edge of greater height than the rear edge so as to define a downwardly sloping upper surface. The base layer supports an essentially constant thickness intermediate layer which is less firm than the base layer. The intermediate layer has a pair of laterally spaced recesses formed in the forward end of the intermediate layer which curve both upwardly and inwardly from the front edge of the intermediate layer. A top layer is secured to the intermediate layer and has a constant thickness. The top layer is formed of foam material which is less firm (e.g., a lower 65% IFD value) than the foam forming the intermediate layer. The intermediate layer is formed of a foam which is less firm (e.g., a lower 65% IFD value) than the material forming the base layer. The upper surface of the top layer defines a pair of depressions in the areas where the top layer is received within the recesses of the intermediate layer. The top layer includes a convoluted upper surface and in one embodiment the top layer includes a similarly convoluted exte…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.