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Handbook for Playground Safety <br />• To minimize the hazard of impact, heavy truck tires <br />should be avoided. Further, if steel -belted radials are used, <br />they should be closely examined to ensure that there are <br />no exposed steel belts or wires that could be a potential <br />protrusion or laceration hazard. Plastic materials can be <br />used as an alternative to simulate actual automobile tires. <br />Drainage holes should be provided in the underside of the <br />tire. <br />• Pay special attention to maintenance of the hanger mech- <br />anism because the likelihood of failure is higher for tire <br />swings due to the added stress of rotational movement <br />and multiple occupants. <br />• The hanger mechanisms for multi -axis tire swings should <br />not have any accessible crush points. <br />• The minimum clearance between the seating surface of a <br />tire swing and the uprights of the supporting structure <br />should be 30 inches when the tire is in a position closest <br />to the support structure (Figure 26) . <br />• The minimum clearance between the bottom of the seat <br />and the protective surface should not be less than 12 <br />inches. <br />2H 2H <br />Denotes Use Zone with Protective Surfacing <br />6 ft. <br />6 ft. <br />11 <br />11 <br />6 ft. + <br />6 ft. <br />Figure 25. Use Zone for Single -Axis Belt Swings <br />5.3.8.4.1 Multi -axis swing use zones <br />• The use zone should extend in any direction from a point <br />directly beneath the pivot point for a minimum distance <br />of 6 feet plus the length of the suspending members (see <br />Figure 27) . This use zone should never overlap the use <br />zone of any other equipment. <br />30" Min. <br />• <br />Figure 26. Multi -Axis Swing Clearance <br />Denotes Use Zone with Protective Surfacing <br />Figure 27. Use Zone for Multi -Axis Swings <br />39 <br />