| 摘要 |
<p>A pair of supported portions (6a and 6a) are provided in a bifurcated manner on the base end of the boom (6) of a work machine (7), and the supported portions are respectively pivoted on a pair of boom supporting portion (12a and 12a) provided on an upper end of a boom bracket (12), and a hose guide (14) is fixed on an upper end of a swing pin (13) for pivoting the boom bracket on a turntable (2). Operation oil hoses (22) for an arm cylinder (10) and operation oil hoses (21) for a bucket cylinder (9) are guided and piped into the boom from between both the supported portions. A hose guide hole (12c) is provided below each of the boom support portions (12a) so that operation oil hoses (23) for the boom cylinder (11) are inserted into the respective hose guide holes. At an intermediate portion of the rear surface of the boom, the operation oil hoses (22) are taken out from the inside of the boom through a hose attachment plate (33) and is connected to respective external hoses (22a) connected to the arm cylinder. At a tip and of the boom, the operation oil hoses (21) are pulled out from the inside of the boom through a rear side inclined surface (50c) of an angle rib (50) so as to be connected to respective external hoses (21a) in connection with the bucket cylinder. <IMAGE></p> |
