Clamshell grab with movable and controlled grab cutting edge for excavating stable soils

摘要

The invention relates to an improved clamshell grab with movable grab cutting edge for excavating stabilised soils. The motion sequence of the cutting edges is positively controlled in such a way that the grab teeth form an acute angle with the formation when the grab is fully open, so that the grab automatically digs into the soil under the action of the closing force. During the closing action, the angle of application of the cutting edge decreases so that the cutting edge forms a continuation of the clamshell base when the grab is fully closed. <IMAGE>