A grab for excavators of foundation walls and rectangular piles, and an excavator provided with said grab

摘要

The grab comprises two shoes (11,12) for support against the walls of the hole (4) that the grab is digging, and means for moving said shoes (11,12) between a folded-in position in which they remain alongside the frame (1) and an unfolded position in which they press against the walls of the hole (4). Preferably, unfolding of the shoes (11,12) is performed automatically when the grab reaches the bottom of the hole (4).;The excavator of the invention is provided with such a grab.;A very high digging force is achieved without an increase in the volume or in the weight of the grab.