| 摘要 |
<p>PURPOSE:To provide a boom structure which does not damage an oil feed hose provided in a boom during the telescopic motion of the boom, and is lighter in weight and can increase its strength. CONSTITUTION:Driving force transmitting member holding spaces 21d, 21e are formed by providing reinforcing partitioning members 21b, 21c which extend longitudinally in a boom member 21 and moreover stretch vertically in the boom member 21, and oil feed hoses H, H' serving as the power transmitting member and a wire W are arrangably composed. Thus, since the driving force transmitting member such as the oil feed hose H moving longitudinally in the boom during the telescopic motion of the boom does not come into contact with an expansion cylinder 24 arranged in the boom, and moreover external force acting on the boom does never directly act, the oil feed hose H or the like is not damaged. In addition, the vertical deflection of the boom member can be checked by the reinforcing partitioning members 21b, 21c provided so as to vertically stretch in the longitudinal direction of the boom member.</p> |
