E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/79
E21B 10/66 (2006.01) E21B 10/32 (2006.01)
Patent
CA 1328655
Abstract of the Disclosure The invention relates to a simplified and reliably functioning drill tool for a sinker drill for drilling in loose earth, such as when reinforcing the foundations in connection with building. The drill tool according to the present invention is in two parts and consists of an upper cylindrical transition piece, its central axis coinciding with the rotary axis of the drill tool, and provided with an eccen- tric, cylindrical hole, and of a lower reamer piece provided with an upwardly directed shaft to fit into the hole. In the operating position the shaft is fully inserted into the hole and the transition piece and reamer piece cooperate. In the extraction posi- tion the shaft is partially withdrawn from the hole to permit the drill to be drawn up through a casing-tube.
548518
Lovab Lof Och Ostlund Ab
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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