| 摘要 |
PURPOSE:To easily mount a sail mounting post and avoid the interference between a derrick boom and sail, by rotatably providing the sail mounting post to the center part of a crane post and rotating these both posts independently of each other. CONSTITUTION:A crane post 11 consists of a bottom post 12 fixed to an upper deck and an upper post 13 rotatably mounted to the post 12 by bearings 15a, 15b. A crane 31 having a derrick boom 32 is mounted to the post 13. A sail mounting post 42 is vertically provided onto a bearing 41 mounted to the upper deck to interpose a bearing 16 between the post 13 and the post 42. A sail 43 is equipped to the post 42 while a gear 44 meshed to an outer gear 46 of a reversible motor 45 is provided to the post 42. Further a sail mounting post clutch 17 is provided to the post 12 to perform connection and disconnection between these posts. While a crane post clutch 20 is interposed between the posts 13, 12 to perform connection and disconnection between the both posts 12, 13. |
