| 摘要 |
A cobble and small boulder debris removal device including a quiescently open 3 prong claw, and a series of springs and cables within or affixed to a shaft to close the prongs in gripping and holding such cobbles when encountered in the pre-clearance of a borehole, to be then removed by being lifted away and released via a relaxation of a lever connected with a main actuating cable. |
