| 摘要 |
<p>The frame (100) is assembled of two lateral bars (102) and two transversal bars (104) accommodating a multitude of transversally positioned slats (108), joined with their outer ends to elastic elements (106) provided at the frame (100). At least two of the slats (108), preferably in the shoulder area, are arranged in pairs (112, 114) with additional slats (112) located underneath. The upper slats (114) of the unit (110) are softer and can be connected (116) to the lower ones (112) at different spots in order to adjust the level of firmness.</p> |
