| 摘要 |
<p>Adjusting means for hoisting cranes or the similar, consists of a work spindle, which is given an axial travel within a cylinder by means of a relative movement between a screw and a cooperating groove following driving means. The work spindle has a free end, which is connected to a lifting arm of the hoisting crane through a connector or the like. In order to make it possible to move the work spindle axially without help of the driving means, when emergency, the connector (8) consists of a connection which is stiff in the axial direction of the work spindle, and which consists of two parts (9, 11) which are rotatable in relation to each other against a certain friction resistance around an axis, which is concentric to the work spindle (5).</p> |
