UNDERGROUND CONTINUOUS DITCH EXCAVATOR

摘要

PROBLEM TO BE SOLVED: To provide an underground continuous ditch excavator provided with a cutter chain having a bit facilitating the repair at a construction site and facilitating the change of a position of an excavation blade. SOLUTION: A first bit 7 and a second bit 9 of the cutter chain 4 which is extended and fitted to a sprocket provided at upper and lower parts of a cutter post 3 of the underground continuous ditch excavator 1 are structured as follows. The first bit 7 comprises; a pedestal 71; a guide means 72 mounted to the pedestal 71 in a projecting manner in which a head is formed at the top of a plate member and a plurality of pin-engaging grooves 72a are formed at the upper surface of the head; an excavating blade 73 having an engaging part 73a passing the plate member of the guide means 72 capable of being fitted to the head and having a pin hole 73b; and a detachable fixing pin 74 inserted into the pin hole 73b and engaged with each of the pin-engaging grooves 72a. The second bit 9 is also structured in the same manner as that in the first bit 7. COPYRIGHT: (C)2007,JPO&INPIT