cross member 55 the power drive mechanism 26 as seen in fig6 includes a battery 74 mounted on a battery mount 75 carried by cross frame member 39 an electric motor 75 a that drives a pulley assembly 76 that carries a belt 77 which extends over a pulley 78 mounted at the top of a fixed vertical frame member 79 welded at its lower end to cross member 39 and the belt extends forwardly and is looped around a cross member 81 fixed between frame members 47 and 48 the belt 77 pulls the rear link members 47 and 48 upwardly driving the four bar linkage 20 the four bar linkage 20 drives the forward wheel carriage 18 through the linkage 24 because link 61 is carried by the link 47 as seen in fig6 as seen in fig9 the pivot mechanisms 21 and 22 include a pair of spaced semi circular plates 84 welded together by tube 85 and which pivotally mounts a cross frame plate 87 plates 84 have recesses 88 that receive a detent mechanism 89 that holds the cross members 53 in the 45 degree position illustrated in fig1 or the horizontal position shown in fig9 the detent mechanisms are operated by a cable mechanism 90 these pivot mechanisms 21 and 22 are identical as seen in fig8 a forward leg assembly 92 and a rear leg assembly 93 are provided for lifting the stand 10 off the floor of a vehicle.