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Handbook for Playground Safety <br />3. PLAYGROUND HAZARDS <br />This section provides a broad overview of general hazards <br />that should be avoided on playgrounds. It is intended to <br />raise awareness of the risks posed by each of these hazards. <br />Many of these hazards have technical specifications and tests <br />for compliance with ASTM F1487 and F2373. Some of these <br />tests are also detailed in Appendix B. <br />3.1 Crush and Shearing Points <br />Anything that could crush or shear limbs should not be <br />accessible to children on a playground. Crush and shear <br />points can be caused by parts moving relative to each other <br />or to a fixed part during a normal use cycle, such as a seesaw. <br />To determine if there is a possible crush or shear point, <br />consider: <br />• The likelihood a child could get a body part inside the <br />point, and <br />• The closing force around the point. <br />Potential crush/shear hazards specific to certain pieces of <br />equipment are identified in §5.3 Major Types of Playground <br />Equipment. <br />3.2 Entanglement and Impalement <br />Projections on playground equipment should not be able to <br />entangle children's clothing nor should they be large enough <br />to impale. To avoid this risk: <br />• The diameter of a projection should not increase in the <br />direction away from the surrounding surface toward the <br />exposed end (see Figure 2). <br />• Bolts should not expose more than two threads beyond <br />the end of the nut (see Figure 3). <br />• All hooks, such as S-hooks and C-hooks, should be closed <br />(see also §5.3.8.1). A hook is considered closed if there is <br />no gap or space greater than 0.04 inches, about the thick- <br />ness of a dime. <br />— Any connecting device containing an in -fill that com- <br />pletely fills the interior space preventing entry of cloth- <br />ing items into the interior of the device is exempt from <br />this requirement. <br />• Swings and slides have additional recommendations for <br />projections detailed in §5.3. <br />• See Appendix B for testing recommendations. <br />3.2.1 Strings and ropes <br />Drawstrings on the hoods of jackets, sweatshirts, and other <br />upper body clothing can become entangled in playground <br />equipment, and can cause death by strangulation. To avoid <br />this risk: <br />• Children should not wear jewelry, jackets or sweatshirts <br />with drawstring hoods, mittens connected by strings <br />through the arms, or other upper body clothing with <br />drawstrings. <br />• Remove any ropes, dog leashes, or similar objects that <br />have been attached to playground equipment. Children <br />can become entangled in them and strangle to death. <br />Diameter has <br />increased <br />Figure 2. Example of a hazardous protrusion that <br />increases in diameter from plane of initial surface <br />and forms an entanglement hazard and may also <br />be an impalement hazard. <br />Figure 3. Example of a hazardous protrusion that <br />extends more than 2 threads beyond the nut and <br />forms an impalement/laceration hazard and may <br />also be an entanglement hazard. <br />13 <br />