| 摘要 |
A multipurpose antenna pole is provided to prevent a movable operation of the pole according to introduction of various kinds of dusts, foreign substances, or moisture into the pole by a structure in which a key and a key groove are guided. A multipurpose antenna pole includes a hydraulic cylinder(20), a drum, an encoder, a control unit, a display, a sealing cap(70), and a sealing ring. A rod(22) of the hydraulic cylinder is connected to a topmost pole(11) among a plurality of poles. A wire(35) wound to the drum which is rotatable in a forward direction or a reverse direction is connected to the pole. The encoder is disposed on a drum axis of the drum. The control unit calculates an overall length of the pole by using a value measured by the encoder. The display displays the overall length of the pole calculated by the control unit to allow a user to grasp the overall length of the pole. The sealing cap is coupled with a top end of the pole. The sealing ring is formed inside the sealing cap which is in close contact with an outer circumference surface of the inner pole.
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