HAMMER GRAB BUCKET AND ITS CROWN APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a hammer grab bucket and its crown apparatus allowing the efficient removal of a buried object and facilitating pull-up operation to enhance safety by relieving restrictions on the weight of the buried object such as an underground pile to be pulled up from the ground.;SOLUTION: The crown apparatus of the hammer grab bucket comprises a first crown 5 detachably locked to a suspension cylinder 6 at the top of the hammer grab bucket 1 and allowing a latch 37 vertically moved together with a bucket suspension rope 3 to pass through inside, and a second crown 31 supported through a flexible support member 32 by a hoisting means larger in lifting force than the bucket suspension rope 3 while supporting the first crown 5 by a flexible support member 33 and allowing the bucket suspension rope 3 to pass through. In a state of locking a locking claw 59 of the second crown 31 to the latch 37, the hammer grab bucket 1 is lifted together with the lifted object by the hoisting means with large lifting force.;COPYRIGHT: (C)2008,JPO&INPIT