| 摘要 |
<p>The drum and assembly includes the drum itself (2), made of wood, metal or synthetic material. The drum includes an internal drum of diameter which may be varied, inserted between two end discs (4,5) of greater diameter. The drum is carried on a frame including a base and two side walls (8,9). The frame also supports a drive mechanism (15,17) for the shaft on which the drum is carried. This may include a hydraulic power unit and motor. Outside the drum there is an extended arm (43) supporting a measuring device (40) which controls the winding or unwinding of the cable on the drum according to the status of the cable.</p> |
