| 摘要 |
<p>The crane is a type with a rotating turret on a column and a jib, one end of which is pivoted to the column and the other end has a sheave for the lifting cable. There is also jib raising and lowering equipment. When out of use, the jib (3) is placed horizontal and parallel to the deck (6), and the pulley block (16) is moved against the end (14) of the jib and all is then locked. The turret (4) is also locked to the column (2) to prevent jib rotation.</p> |
