| 摘要 |
A telescopic mast (2) comprising a plurality of telescopic sections (4', 4'', 4''') each with walls extending in the longitudinal direction of the mast (2), where the transverse dimension of the innermost telescopic section is smaller than the outermost telescopic section of two adjacent telescopic sections, so that the innermost telescopic section can slide longitudinally in and out of the outermost telescopic section of two adjacent telescopic sections (4', 4'', 4'''), wherein a restrictor (6) is provided between two adjacent telescopic sections (4', 4'', 4'''), the restrictor (6) comprising a longitudinally extend- ing linear guide means (8) provided on one of two adjacent telescopic sections and a clamping means (10) provided on the other one of two adjacent telescopic sections, wherein the clamping means (10) is configured for providing a clamping force (12) to the guide means (8) during relative movement of said two adjacent telescopic sections (4', 4'', 4'''), wherein the clamping force (12) include two opposite directed rotation force components (14) in a plane normal to the longitudinal direction of the mast and perpendicular to the radius (16) of the mast (2) through the guide means (8). |
