Constant force cushion

Details Constant force cushion Constant force cushion

1985-03-29

1987-12-22

Smith, Gary L.

Beds

Bedclothing

And means to facilitate changing thereof

5448, 297DIG1, A47C 2716

Patent

active

047138548

ABSTRACT:
A cushion is composed of strips formed from resilient foam material, and these strips provide a displaceable surface which, when deformed, exerts a restoring force that is generally constant irrespective of the extent of the deformation. Thus, the cushion will apply a generally uniform supporting pressure against an irregularly contoured body that is supported on it. Each strip is composed of a succession of arch-like segments. Moreover, the strips are arranged side-by-side with the arch-like segments of any strip being offset from the arch-like segments of the strips adjacent to it.

REFERENCES:
patent: 3047282 (1962-07-01), Hardy
patent: 3258791 (1966-07-01), Kaplan
patent: 3681797 (1972-08-01), Messner
patent: 3940811 (1976-03-01), Tomikawa et al.
patent: 3974532 (1976-08-01), Ecchuya
patent: 4005236 (1977-01-01), Graebe
patent: 4064578 (1977-12-01), Yamada
patent: 4106139 (1978-08-01), Southard
patent: 4276666 (1981-07-01), Yamada
patent: 4399574 (1983-08-01), Shuman
patent: 4541136 (1985-09-01), Graebe

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