| 摘要 |
<p>A cushion for support of a sitting or lying person such as a seat cushion or mattress, consists of a water-filled cover of soft flexible foil material such as weldable plastic foil. The inner water-filled cavity contains devices for damping of liquid flows and can be connected to one or more equalizing vessels. The interior of the cover is divided into cells which are defined by bottom and side walls (2) and an expandable diaphragm (1) so that together the diaphragms (1) form the supporting or lying surface of the cushion, and every cell is connected to a channel (3) which can be common to all cells or a group of cells, partly via a check valve (5) which when open and at an increasing pressure in the cell allows a quick flow of water from the cell to the channel, and when closed prevents flow in the opposite direction, and partly via throttling devices (6) which allow a slow flow of water from the common channel (3) to the cell. The check valve may appropriately be a bistable check valve.</p> |
