| 摘要 |
The invention is related to a hoisting device, in particular a floating derrick with a hoisting portal (1, 2) or hoisting pole on the upper end (2) of which a plurality of juxtaposed tackles (3, 4) is pivotably mounted in which each of said tackles (3, 4) comprises a fixed upper block (3) with a plurality of pullies and a free lower block (4) with a plurality of pullies (5). The invention aims to provide a hoisting device of the said type having more pullies (5) in the tackles to increase the hoisting power; of which the lift height is increased; the pivot angle about which the lifting cables may pivot sidewards is far greater than 15 DEG ; the construction is simple; and having the possibility of mutual oupling of the outer and inner blocks. According to the invention this is obtained by the fact that the rotary shafts of the pullies (5) extend substantially perpendicular to the pivot shafts by which the upper-blocks (1, 2) are suspended to the portal or pole. The freedom of use of the hoisting device according to the invention is increased considerably. |
