| 摘要 |
<p>In a rectangular frame (1) a harness (2) is mounted to slide freely. On the harness is a roller turning freely on spindle (4). The harness can move between positions (A) a and (B). At the rear of the harness at (5) is fixed chain (6) engaging with wheel (7) turning on spindle (8), solid with the frame. The end (10) of the chain joins a tension spring (9) rolling on pulley (13), the other end being joined to a point (11) on the chassis. A belt (C) is fixed at a point (12) on the frame and passes around roller (3), then roller (14). The other end is fixed at (15).</p> |
