| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a clamshell grab with a bucket which achieves a faster vertical movement speed than that of a clamshell grab with a closed bucket while having a greater excavation amount than that of the conventional clamshell grab with an opened bucket. <P>SOLUTION: A clamshell grab bucket 10 includes at least one shutters 42 and 44 that take an open position where an opening is opened and a close position where the opening is closed by the shutter, which improves a vertical movement speed of buckets 16 and 18 while increasing the excavation amount. <P>COPYRIGHT: (C)2012,JPO&INPIT |
