Device for driving a tool positioned on a pivotable part

A device driving a tool positioned on a pivotable part, said device comprising:

• an engine;
• coupling means between the engine and the tool, the engine being stationary and having a motor drive shaft with an axis, the extension of the axis of the motor drive shaft crossing a pivot axis of a pivotable part and being perpendicular thereto;
• a pivotable transmission shaft, with a transmission axis, being driven by said motor drive shaft by means of a gear transmission, said transmission shaft being rotatably supported by the pivotable part such that said transmission axis crosses and is perpendicular to the pivot axis while the transmission shaft runs substantially parallel to a longitudinal axis of the pivotable part, and upon pivoting remains in a longitudinal plane of the motor drive shaft;
• a first transmission wheel mounted on a wheel shaft, the axis of which coincides with the pivot axis of the pivotable part, said first transmission wheel being engaged with a motor drive shaft wheel driven by on the motor drive shaft, and a second transmission wheel mounted on the transmission shaft;
• and
• an output shaft driven by said transmission shaft mounted on the pivotable part, running parallel to the transmission shaft, connected to the tool to be driven.