| 释义 |
derricking, vbl. n. and ppl. a.|ˈdɛrɪkɪŋ|
[f. derrick n. + -ing1, -ing2.]
a. vbl. n. The action of operating the jib of a derrick-crane.
b. ppl. a. Operating as a derrick.
1888Lockwood's Dict. Mech. Engin. s.v. Derrick, Portable cranes..are provided with movable jibs, whose mechanism for derricking is made in various types. 1911C. W. Hill Electr. Crane Constr. iii. 31 An electric motor..was provided to drive the lifting and derricking motions. 1940Chambers's Techn. Dict. 236/1 Derricking jib crane, a jib crane in which the inclination of the jib..can be varied by shortening or lengthening the tie-ropes between post and jib. 1958H. H. Broughton Electr. Cranes (ed. 3) xvii. 236 Derricking motion. The movement of a crane jib when it is pivoting in a vertical plane is known as derricking or luffing. Ibid. 239 Hoisting rope is taken up which prevents the load from being lowered as it would be with ordinary derricking gear. |
