| 摘要 |
<p>A mechanical adjuster for e.g. the cutting reel of a grass cutting unit comprises a hand wheel (40) on a shaft (44) which is journalled in a trunnion (34). A connecting eye (36) is screw threaded to the hand wheel shaft to provide the desired adjustment. A cam arrangement (58, 62, 68) between the shaft and the trunnion superimposes a reciprocation on this adjusting movement. This serves to impose and then remove the strain energy necessary to overcome resistance to movement, leaving an adjusted mechanism which is unstressed and less likely to loose position if shocks are subsequently encountered.</p> |
