Seat cushion with portions with different compression characteristics
US4837881A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Dec 1, 1987 |
| Grant date | Jun 13, 1989 |
| Priority date | — |
| Expiry date | Dec 1, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S297/01
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A seat cushion with compression characteristics which differ by portions including an upper layer portion, which is made of a low hardness foamed body and forming an entire surface of the seat, and a lower layer portion, which is made of a high hardness foamed body and supporting the upper layer portion, the upper and lower layer portions being soft composition polyurethane foamed bodies and molded in a same foaming mold to form an integral body with a strong boundary portion formed along their interface. A basic profile of the upper layer portion is a sloped plane with its height increased toward a front, edge, in the longitudinal direction, while that of the lower layer portion corresponds to a sitting posture of a human body occupying the seat. In a hind seat portion, a thickened portion is provided for the entire surface in a transverse direction by thickening the low hardness foamed body into having a cross section of a concaved arc form in the longitudinal direction by approximating the sitting posture line of a buttocks. In a front seat portion, on either a right or left side, the upper layer portion is made thicker than the basic profile by gradually increasing its thicknes…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.