Patent ID: 7425039

Claim:
A body-supporting device comprising: a tray comprising a margin and a groove in the margin, wherein the groove gets narrower downwardly; a net comprising a margin; a frame comprising a first rib for inserting the margin of the net into the groove of the tray so that the margin of the net is sandwiched between the first rib and the groove, and a second rib for pressing the margin of the net against the margin of the tray so that the margin of the net is sandwiched between the second rib and the groove, wherein the first rib gets narrower downwardly; and a plurality of fasteners driven into the first rib of the frame through the margin of the tray so that sandwiching of the margin of the net between the first rib of the frame and the margin of the tray gets firmer as the fasteners get tighter in the first rib of the frame.