| 摘要 |
<p>The invention relates to an ergonomic back support attachable to drivers' chairs or to ordinary chairs, comprising a metal frame (A) of rectangular shape consisting of two parallel, horizontal sides (a and b) and two vertical sides ( c and d) and a casing (B) made of wide cotton strip (1), where the vertical sides (c and d) are symmetrical and each placed in a vertical plane (III and IV), forming an angle of 45 with the vertical plane (III and IV) determined by the horizontal sides ( a and b) formed by three areas, each of the vertical sides ( c and d) being formed by a lower curved area (e) with a large radius of curvature (R1) and in a ratio of (0.3 - 0.35 of the total length (f) of the vertical side, a rectilinear area (g), in a ratio of 0.50 - 0.55 of the total length (f), and a upper curved area (h) with a small radius of curvature (R2) and in a ratio of 0.15 - 0.2 of the total length (f), the wide cotton strip (1) being located in a series of quasi horizontal strips in zigzag, and some vertical strips (2), tightened by a buckle (3).</p> |
