Seat device having a function of retaining person's seated position
摘要
<p>A device for retaining a person's seated position is provided as seats for vehicles, for example. The device has a seat member and an upper body support member. The seat member has a seat surface on which a person is seated. The seat surface has a pair of reference ridges each of which is fit to a recess between a biceps femoris muscle and a semimembranosus muscle of each of thighs of the person. The upper body support member has an upper body support surface that supports an upper body back of the person. Various types of ridges are provided on the upper body support surface for stabilizing the upper body of the person seated on the seat.</p>
