Patent ID: 8459477
Filing Date: 2013-06-11
Classification: B66C

Abstract:
1. A hoisting crane, comprising: a substantially hollow vertical column with a foot which is or can be fixed to a support, and with a top; an annular bearing structure, which extends around the vertical column and guides and carries a jib connection member, so that the jib connection member can rotate around the column; a jib connected to the jib connection member, the jib connection member forming a substantially horizontal pivot axis so that the jib can be pivoted up and down; a column top cable guide having a first topping cable pulley assembly and a first hoisting cable pulley assembly; a topping winch and an associated topping cable for pivoting the jib up and down; and a hoisting winch and an associated hoisting cable for hoisting a load, wherein the topping winch and the hoisting winch are disposed such that the hoisting cable and the topping cable extend from the associated winch upward through the column to the column top cable guide and from said column top cable guide to the jib, wherein the jib has a second topping cable pulley assembly for the topping cable and a second hoisting cable pulley assembly for the hoisting cable, wherein the column top cable guide is mounted via an associated rotary bearing structure at the top of the column, such that said column top cable guide follows rotary movements of the jib about the vertical column and adopts substantially the same angular position as the jib, and wherein a mobile subframe is mounted on the column top cable guide, said mobile subframe supporting an intermediate topping cable pulley assembly along which the topping cable passes between the column top cable guide and the jib, such that, in a topped up position of the jib, an angle between the jib and the topping cable is greater than the angle between the jib and an imaginary line from the topping cable pulley assembly on the jib to the topping cable pulley assembly on the column top cable guide.