tabs 40 and are interconnected by a torsion bar 42 vertical links 28 rotatably fasten to horizontal links 26 at bearings 44 vertical links 28 horizontal links 24 and hydraulic cylinder rods 46 all rotatably fasten together at bearings 50 as seen also in fig8 the piston rod 46 of a cylinder 18 has its end threaded and screws into a threaded orifice in bearing 50 vertical link 28 is open at its end and the open end is wide enough so that throughout the assembly 39 s range of movement rod 46 does not bind on vertical link 28 when the rods 46 are pushed out from cylinders 18 they raise linkage 22 to the position shown in fig2 and 5 affixed to linkage 22 is a housing 52 pins 54 in horizontal links 26 slidably engage and fit within the slots of slotted blocks 56 mounted onto the forward portion of the interior side walls 53 of housing 52 slightly disposed away from and parallel to its screws 57 pins 58 on horizontal links 24 rotatably fit in holes in blocks 60 mounted on the rearward portions of the inside of the side walls 53 of housing 52 by screws 61 these pin in slot or shaft and linear bearing and pin in hole or shaft and bushing mountings assist in giving the unique and desired lifting arc needed to place the least possible stress on the physical capabilities of an infirm user of the assembly a funnel 62 having a retaining lip 64 releasably fits into the orifice in housing 52 and provides for sanitary disposal of waste at all positions of the assembly between its fully lowered and fully raised positions if necessary funnel 62 may be easily removed for cleaning after use fig6 schematically.