| 摘要 |
<p>The backrest (1) has a frame (11), and a covering (12) that is stretched over the frame. The frame is bent such that the covering is provided in the form of a saddle surface. The frame comprises a flexible portion, where flexibility of the flexible portion is determined or contributed by a helical spring that is provided in the frame. The frame comprises a set of portions that is arranged with a set of different bending stiffness. The set of portions of the frame comprises an inner frame element that reaches the helical spring.</p> |
