Abstract: A blade assembly including a shank and a bit head. The shank includes elements for mounting the bit head. The bit head includes one or more disk-shaped bit members, which rotate during a drilling/boring operation and which have an outer rim thereof working as an actual cutting face in drilling/boring. The rotary bit member included in the bit head is disposed at an angle of less than 45° relative to a drilled surface.

Abstract: A pushing stick and a ring for the same. The lower end of a shaft comprises a stick ring comprising a fastening part and a projection-like ring frame attached to the fastening part. The bar-like ring frame is directed forwards with respect to the direction of travel and its front is provided with at least one spike. Said spike then resides at a distance from the central axis of the shaft, whereby a bending moment is directed to the ring frame on account of the push force. The ring frame is rigid in order to be able to transmit the bending moment being formed to the lower end of the shaft.