초록 ▼

A seat base is interposed between a supporting surface, such as the sling-type seat of a wheelchair, and a cushion or even the user, it having a lower contour which generally matches the contour of the supporting surface and a upper contour which provides a comfortable seating surface or gives a des

A seat base is interposed between a supporting surface, such as the sling-type seat of a wheelchair, and a cushion or even the user, it having a lower contour which generally matches the contour of the supporting surface and a upper contour which provides a comfortable seating surface or gives a desired shape to an overlying cushion. The lower contour is established by a plurality of transversely directed ribs, whereas the upper contour is established by transversely directed panels located between the ribs. The polymer material from which the seat base is formed has uniform thickness and as a consequence the ribs create grooves that open out of the upper surface to separate the panels.

대표청구항 ▼

A seat base formed from a substantially rigid material of generally uniform thickness, said seat base having spaced apart sides and a plurality of spaced apart ribs which extend transversely toward the sides and project downwardly, the ribs being generally hollow and creating upwardly opening groove

A seat base formed from a substantially rigid material of generally uniform thickness, said seat base having spaced apart sides and a plurality of spaced apart ribs which extend transversely toward the sides and project downwardly, the ribs being generally hollow and creating upwardly opening grooves, the seat base also having panels located between the grooves with the panels being generally wider than the ribs, the upwardly presented surfaces of the panels establishing an upper effective contour which is suited for seating purposes, in that it is at least in part slightly concave, and the downwardly presented surfaces of the ribs establishing a lower effective contour which is substantially different from the upper effective contour in that the spacing between the downwardly presented surfaces of at least some of the ribs and the panels adjacent to those ribs varies along the lengths of the ribs, so that none of those ribs possesses a uniform height, the lower effective contour being generally uniform to conform to an underlying supporting surface of generally uniform shape.