A paired set of handles attaching to a board forming a concrete screed to minimize the strain on a person performing concrete finishing work allows for an ergonomic application of downward force applied to the lower end of the handles and application of an upward lifting force by the shape of the grip...http://www.google.es/patents/US8016517?utm_source=gb-gplus-sharePatente US8016517 - Ergonomic concrete screed handles
