| 摘要 |
<p>A crane (10) comprises a support structure (12,14,16) on which are mounted a jib (18) and a winch (24), a load-handling rope (46) extending from the winch (24) over first pulley means (20) on the free end of the jib (18) to terminate in load-engaging means (48). Second pulley means (32) are mounted on the support structure (12,14,16) between the winch (24) and the first pulley means (20), the rope (46) passing over the second pulley means (32) en route to the first pulley means (20), load-sensing means (40,42) reacting between the second pulley means (32) and the structure (16) and being so arranged that, for the maximum safe load at any given operating radius of the jib (18), the load-sensing means (40,42) experiences a substantially constant predetermined load thereon.</p> |
