not require increased power air flow or consumption application_number US 4245002 A description 1 the invention embodiment in general with preferred scraper ring configuration the view of fig1 shows my invention u201c fluid levitated caster integrating external debris scraper u201d referred to as assembly 42 assembly 42 is shown positioned beneath a heavy load 29 that is to be moved across a floor 27 shown on floor 27 is debris 25 assembly 42 includes a frame 35 a levitation membrane 11 and a scraper ring 31 frame 35 has on it 39 s periphery a series of tapped holes 15 shown in the view of fig2 returning to the view of fig1 scraper ring 31 includes through it 39 s wall a series of slots 21 the quantity and position of which matches tapped holes 15 a series of attachment screws 17 position within slots 21 and secure into tapped holes 15 via this preferred design configuration scraper ring 31 is free to move vertically within the limits of slot 21 and attachment screw 17 travel vertical scraper ring 31 travel is necessary as levitation membrane 11 inflates deflates and moves vertically during normal operation one of a series of spring holes 44 placed into the top surface of scraper ring 31 is shown in the view of fig2 fig1 shows a spring 13 inserted within each spring hole 44 springs 13 insure that scraper ring 31 is in continual force contact with floor 27.