The Scientific Impact of Nations: What different countries get for their research spending

The invention relates to a shaft coupling assembly wherein two shafts are rotationally located with respect of each other by means of splines provided upon the two shafts. The shafts are located axially by the provision of a further member being provided with similar splines, the third member being adapted to be rotated such that its splines may be brought out of engagement with the other splines to lock them together axially. The third member is rotated by means of a bevel gear arrangement which are rotated by means of an adjusting tool. The arrangement is such that the adjusting tool may only be removed when the third member is in the locked position.