Patent ID: 8550267

Claim:
An apparatus for cable management synchronized with telescopic motion such that cables for transmitting power or signals to a manipulator provided on a lower end of a telescopic tube and for receiving signals therefrom are wound or unwound in response to expansion or contraction of the telescopic tube, the apparatus comprising: a frame installed in a trolley box, with the telescopic tube fastened at an upper end thereof to the trolley box; a stationary cable drum provided in an upper end of the frame, with the cables extending from the manipulator to the stationary cable drum and wrapping around the stationary cable drum; a movable cable drum provided below the stationary cable drum so as to be movable upwards or downwards, with the cables extending from the stationary cable drum to the movable cable drum and wrapping around the movable cable drum; a vertical guide roller provided in the frame at a position spaced apart from the stationary cable drum in a horizontal direction by a predetermined distance, the vertical guide roller supporting and guiding the cables towards the stationary cable drum in such a way that the cables extending from the manipulator are wrapped around the vertical guide roller, wherein the stationary cable drum, the movable cable drum and the vertical guide roller each comprise a plurality of pulleys supported by a support shaft passing through central holes of the pulleys, each of the pulleys being inclined to the support shaft at a predetermined angle; and a collar provided between each of the pulleys and the support shaft, the collar being forcibly fitted at a central hole thereof over the support shaft, and a bearing provided between a circumferential outer surface of the collar and a circumferential inner surface of the pulley to allow the pulley to rotate around the collar.