| 摘要 |
The invention refers to an elevating device for mast sections of a sectional mast, particularly a movable aerial mast of framework type and comprising a foot portion with a mast support and guide jacket (4), said device (5) comprising a power-operated screw mechanism (12). In order to avoid a time-consuming idle or return movement of conventional reciprocating raising and lowering mechanism and to provide for a faster erection and dismounting, respectively of the mast it is suggested according to the invention that an elongated transport screw (12) extends vertically along one side of the guide jacket (4) and approximately contacts externally with its periphery the peripheral contour of a mast section (2), housed parallel therewith within the jacket and in that each mast section (2) in its lower portion at the point of contact on the peripheral contour is provided with a mechanical component serving as a nut segment meshing with the threads of the transport screw (12). |
