TELESCOPIC ARM OF CONSTRUCTION MACHINE USED FOR BOTH MEDIUM AND LARGE DEPTH

摘要

PURPOSE:To enable an extension arm to be simply attached in the case when a large depth work is required by means of a construction machine provided with a telescopic arm for medium depth. CONSTITUTION:In the case when digging is required to a large depth after it has been advanced to a medium depth, an extension arm 40 assembled with one extension end pipe 40n or extension end pipes 40n arranged in succession with more than one interposed intermediate pipes 40a in a telescopic manner to be capable of being extended or contracted is fitted into the end pipe 11n of a medium depth telescopic arm 11. An extended adjacent pipe equal interval extrusion and contraction device is constituted extending substantially same as the device for a medium depth telescopic arm for extruding or contracting the extension end pipe 40n relative to a base pipe 11a as well as equalizing the amounts of extension and contraction of all the adjacent pipes to one value. The extension arm 40 can be easily attached and removed to and from the medium depth extension arm without any external help.