| 摘要 |
PURPOSE:To make easier the operation of a crane by a method in which a sheave for the rear drum is provided to the upper shaft of the low gantry of A- frame for a pile driver, a rope holder is provided at the upper end of the periphery of the sheave, and a guide roller is provided to the lower end of the periphery. CONSTITUTION:A sheave 11d to be laid with a rope 8a to be wound around a drum 8 provided behind a shaft 11g is provided on the upper shaft 11g of the low gantry 11b of A-frame 11 on a rotary base 1b for making it usable in pile driving work or as a crane by reassembling of front attachments, having three or more workind drum shafts, e.g., a front drum shaft 17a, a rear drum shaft 17b, and a rising and falling drum shaft 17c. Then, a rope holder 11f is provided to the upper part of the periphery of the sheave 11d, and a guide roller 11e is provided to the lower part. By this, the freedom of arrangement of drums is increased and the reassembling of various attachments is made easier. |
