Patent ID: 8545163

Claim:
A loader work machine comprising: a driving section provided upwardly of a machine body frame; a pair of right/left arms provided on right/left sides of the machine body frame and the driving section, respectively; an implement provided between leading ends of the pair of right/left arms; a pair of right/left traveling devices supporting the machine body frame; a pair of right/left first lift links and a pair of right/left second lift links disposed forwardly of the first lift links for vertically pivotally supporting base portions of the respective arms at a rear upper portion of the machine body frame; an arm cylinder provided between the base portion of each arm and a rear lower portion of the machine body frame for lifting up/down the arm; a first link support shaft for pivotally supporting a lower base portion of the first lift link associated therewith to the machine body frame; a second link support shaft for pivotally connecting a base portion of the second lift link associated therewith to the machine body frame, at a position forwardly of the first link support shaft; a first arm support shaft for pivotally supporting a base portion of the arm associated therewith to an upper free end of the first lift link; a second arm support shaft for pivotally connecting a base portion of the arm associated therewith to a free end of the second lift link, at a position forwardly of the first arm support shaft; a lower cylinder support shaft for pivotally connecting a lower end of the arm cylinder associated therewith to the machine body frame; and an upper cylinder support shaft for pivotally connecting an upper leading end portion of the arm cylinder associated therewith to the base portion of the arm; a leading end of the arm being lifted up/down forwardly of the machine body frame; wherein positional relationship among the first link support shaft, the second link support shaft, the first arm support shaft and the second arm support shaft is set such that an upper portion of the first lift link comes into substantial agreement with a rear end of the machine body, when the upper free end of the first lift link is pivoted maximally rearward in the course of transition of the arm from a lowermost state realized by lifting down the arm in response to contraction of the arm cylinder to an uppermost state realized by lifting up the arm in response to expansion of the arm cylinder; under the lowermost state, the second lift link is inclined upwardly rearward; under the lowermost state, the first arm support shaft is located rearwardly of the first link support shaft; and the first link support shaft is disposed rearwardly of the lower cylinder support shaft.