| 单词 | luff in |
| 释义 | > as lemmasluff in 5. transitive. To alter the inclination of (the jib of a crane or derrick); to raise or lower in a vertical plane. Also with adverbs, as luff in, to raise (the jib), so moving the hook nearer to the operator; similarly luff out. ΘΚΠ society > occupation and work > industry > working with tools or equipment > work with tools or equipment [verb (transitive)] > lifting or hoisting equipment to wind upc1275 windc1440 sling1522 crane1570 hoise1573 pulley1581 tackle1711 lewis1837 teagle1841 to jack up1853 windlass1870 whorl1886 luff1913 1913 H. Wilda Cranes & Hoists ii. 128 The lifting and lowering of the load is effected by means of multiple pulley blocks, the horizontal movement of the load by luffing the jib. 1922 H. H. Broughton Electr. Handling of Materials III. ii. 32 The load follows a horizontal path when luffing-in the jib. 1932 S. J. Koshkin Mod. Materials Handling v. 78 A derrick boom can be changed in inclination, or luffed, to give one of the components of motion to the load. 1932 S. J. Koshkin Mod. Materials Handling v. 80 The boom is luffed-in or out as little as possible. 1963 R. Hammond Mobile & Movable Cranes vi. 180 This arrangement reduces the power required to luff in the jib. < as lemmas |
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