| 摘要 |
A pneumatic cushion (A) for a wheel chair and the like is disclosed which comprises an air housing box (B), a plurality of air openings in the air housing box, and a plurality of air channels (16, 18, 20, 22) communicating with an air supply. The air channels communicate with the air openings to deflate and inflate individual air sacks (S) carried over the air openings. An air distribution manifold (F) includes a rotating blocking member to periodically block air distribution to the air sacks allowing them to deflate. The air sacks (S) are constructed from a fabric having a low air permeability thus allowing air to escape (70) through the sacks for deflation which cools the portion of the occupant seated on the cushion while allowing temporary pressure relief during deflation. The air sack inflation system is open so that pressure may be relieved by a backward flow of air (72) through the system. |
