MULTI-STAGE TELESCOPIC ARM DEVICE AND DEEP-DIGGING EXCAVATOR COMPRISING MULTI-STAGE TELESCOPIC ARM DEVICE

摘要

side of the front end of the boom 4 and install the elastic arm 12 formed of the outer cylinder 13 and the inner tube (21, 23) of the plurality of stages. The outer sleeve 13 has an elastic fixing cylinder 25 fixed sheave (31, 31 ') for expansion and also with the arrangement. Stretching cylinder (25) is provided in the outer cylinder 13 by the rod (25B) upwardly, the tube (25A) is the free end moves along the outer cylinder (13). Install the new cylinder, sheave installation sphere (30) tube (25A) of 25, and there is installed a movable sheave (33, 33 ') for stretch sheave installation sphere (30). Rope for stretching (34, 34 ') is fixed sheave (31, 31, for new construction, is wound in) and movable sheave (33, 33') for expansion and contraction. ;