in relatively fixed lateral relationship to the columns while permitting vertical movement of the elevator the wheels may be rubber tired and if desired spring loaded to obviate possible jamming that could occur with rigidly fixed wheels members 81 and 82 are notched at their outer ends as shown to provide clearance for the columns 12 13 14 and 16 so that elevator 41 can move freely up and down the floor of elevator 41 is designed to rest upon and be affixed to members 71 72 73 and 74 the floor comprises first and second pairs 102 102 and 103 103 of walled or flanged tire guides the floor further comprises third and fourth pairs 104 104 and 106 106 of walled or flanged tire guides oriented at right angles to the first and second pairs of guides the tire guides may be built up from one inch c channel steel for example and cut and welded to the other tire guides at their intersections the flanges are also cut at the intersections thereby creating a plurality of walled open spaces 107 107 108 108 and 109 109 to avoid possible damage to vehicle tires the corners of the walls of the open spaces are rounded as shown open spaces 108 108 have mounted on and.