| 摘要 |
<p>1499261 Dynamometers AMERICAN HOIST & DERRICK CO 2 Feb 1976 [1 May 1975] 04043/76 Heading G1W [Also in Division B8] A load indicator 10, shown in use interposed between a load line 11 and a hook 12 carrying a load 55, includes a housing 21 with circumfer- entially aligned sight openings 39 through which a sleeve 49 is visible. The sleeve 49 has two distinctive sight bands, preferably red 38 and green, and is displaceable in relation to the magnitude of the load 55. When unloaded the indicator 10 shows wholly green at the openings 39 and when the load 55 is the rated maximum load the openings 39 show wholly red. Intermediate loads 55 are judged from the relative amounts of red and green visible through the openings 39.</p> |
