Wheel crane

Abstract

A wheel crane wherein the maximum radius of pivotal motion of a boom is minimized and the boom foot mounting point can be positioned as rearwards as possible to realize an increase of the boom length. The wheel crane comprises a lower running body, an upper pivotal body, a boom mounted for up and down pivotal motion around a boom foot pin on the upper pivotal body, at least two winch drums and guide sheaves disposed at rear locations of the pivotal body. The boom foot pin is mounted at an end portion of the base end portion of the boom on the rear face side of the boom and at a location of the upper pivotal body rearwardly of the center of a rear axle of the lower running body. The guide sheaves and winch drums are mounted in a left and right juxtaposed relationship on the upper pivotal body nearest to the base end of the boom within a range wherein they are not contacted with the base end of the boom when the boom is pivoted upwardly, and the locations of rear ends of the two guide sheaves are substantially coincident to the position of the rear end of the upper pivotal body in the forward and backward directions.