19 is thus mounted on base 11 by legs 54 near the corners of the platform each of the legs has a block of resilient material 56 such as ethyl vinyl acetate or polyurethane which is received in vertically aligned pockets 57 58 on the upper side of the base and the lower side of the platform step 28 likewise has legs 59 near its corners of its platform those legs have blocks of resilient material 61 which rest upon the floor and are received in pockets formed by flanges 62 on the lower side of the platform the blocks of resilient material for both steps are affixed in the pockets by an adhesive operation and use of the embodiment of fig6 is similar to that of the embodiment of fig1 the embodiment of fig7 is similar to the embodiment of fig6 with the addition of leaf springs 64 which supplement the resilient legs 59 in supporting the step platforms each of the springs has two arched leaves 66 67 which are disposed back to back with the arches facing away from each other and connected together at their ends the leaves can be fabricated of any suitable material such as spring steel or fiberglass and in the embodiment shown they extend along the front and rear edges of the platforms the upper leaves 66 of the springs for upper step 19 are attached to the lower side of platform 21 by u bolts 68 and lower leaves 67 are similarly attached to the top panel 12 of base 11 by u bolts not shown so that the springs provide additional resiliency and resistance to downward movement of the step in lower step 28 the arched leaf springs are positioned between the underside of platform 29 and.