Abstract: A jack for raising a load, the jack being adapted to be fixed to the load; the jack comprising driving means coupled to a linkage which can be driven from an upper position to a lower position in order to raise the load, the driving means comprising a rotating crank for driving the linkage whereby in one revolution the crank drives the linkage from the upper to the lower and back to the upper position, the linkage being a parallelogram linkage comprising a base plate pivotally attached to support arms pivotally secured to the load whereby in the lower position the support arms of the linkage are substantially perpendicular to the base plate to raise the load.