| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an expanding and contracting device of a lower traveling body which increases the expanding and contracting range of the lower traveling body and which enables the strength thereof to be easily secured. <P>SOLUTION: Double guide parts of an inner guide part 18 and an outer guide part 17 are disposed before and after a center frame 9 of the lower traveling body toward right and left direction. Respective cylindrical frames 21 are disposed on right and left side frames 10 of the lower traveling body so as to be projected to the inner side of right and left side frames 10 of the lower traveling body from intermediate parts in the right and left direction or the outer ends of the side frames 10. Each cylindrical frame 21 is fit between the inner guide part 18 and the outer guide part 17 so as to be slidable. The expanding and contracting device of the lower traveling body has such a structure that the right and left outer ends of the inner guide part 18 are projected to the outer sides than the right and left outer ends of the outer guide part 17. <P>COPYRIGHT: (C)2012,JPO&INPIT |
