| 摘要 |
<p>I M P R O V E M E N T S I N T A C K L E S Interposed between the driving shaft 25 of the tackle and the hoisting hook 15 of the tackle is a flat textile strap or a flat metal braid 5, The strap or braid 5 is attached to the drum 21 of a drum-pulley 2 keyed on the driving shaft 25 at the end 23 of the strap or braid. The strap passes around the pulleys 4 of a pulley-block 9 comprising an upper block 6 mounted on the frame 10 of the tackle to pivot about a horizontal axis X-X, and a lower block 27 suspended from the strap or braid 5 and carrying the hook 15,</p> |
