A rotational drive apparatus for screw pilings is described. The apparatus comprises a housing having a cylindrical pipe coupling adapted to receive a shaft of a screw piling therethrough. A detachable connecting element secures the coupling to the shaft at different positions along the shaft. A rotational...http://www.google.de/patents/US20060251478?utm_source=gb-gplus-sharePatent US20060251478 - Rotational drive apparatus for screw pilings
