| 摘要 |
The arrangement by means of which an aerial can both rotated and tilted comprises a gear housing (1) which has a lower attachment for fitting the housing to the top of a mast, and a tube (4) for carrying an aerial. The upper attachment (3) includes a lower part (6) which is connected firmly to the tube (5) and an upper part (4) which is hinged to the lower part (6); in that the tube (5) has located therewithin a rod (10) or like element which can be moved in the direction of the tube axis and the upper end of which rod (10) is attached to the upper part (7) of the upper attachment (3), such that when the rod (10) is moved axially the angle defined by the two attachment parts (6, 7) with said longitudinal axis is changed; and in that the gear housing has provided therein activating means (18, 19, 26, 27) for displacing the rod (10) axially relative to the gear housing (1), therewith enabling a top sleeve (4) attached to the upper part (7) of the upper attachment (3) to be brought to a pre-determined angle with the tube (5) and enabling this angle to be maintained during rotation of the tube about its longitudinal axis. |
