Patent ID: 8020323

Claim:
A tool for drilling and mixing cuttings with another material, the tool comprising: two pairs of rotary drums in axial alignment on parallel axes, each drum being fitted with a cutter for drilling and mixing the cuttings with another material; a motor mechanism for driving the rotation of said drums, said motor mechanisms being mounted inside the drums; a support element comprising a guide beam having a thickness and a length in horizontal section which are substantially less than a thickness and length in horizontal section of the tool; and a support structure on which said drums are mounted to rotate and which are serving to connect said drums to the support element; said support structure comprising: a plate that is substantially orthogonal to the axes of rotation of the drums, the bottom ends of said plate forming bearings for said drums, said plate having a constant thickness which is substantially less than the length of the axes of rotation of a pair of cutters; and a mounting pad connected directly to the bottom end of said guide beam and fastened to the top end of the plate, the top edge face of the plate connecting said pad to the bearing-forming portion being shaped so that, in association with the thickness of the plate being less than the length of the axes of rotation of a pair of cutters, the tool can be raised through the mixture of cuttings and another material, wherein the width of said mounting pad is less than one-third the length of the drilling tool in the horizontal direction orthogonal to the direction of the axes of the pairs of cutters.