REGULATION 12 SCHEDULE 1 4.5 Retention System Testing – Effectiveness 4.5.1 Principle The headgear positioned on a headform is subjected to a tangential force at the rear edge of the headgear in a forward direction. The resulting shock places a rotational load on the headgear. The headgear may be shifted but must not roll off. Figure 7. Typical Apparatus for Retention System Effectiveness 4.5.2 Apparatus A typical apparatus is shown in Figure 7. The headform (to EN 960 without hair) is mounted on a stand in the upright position. To this is fitted the headgear according to manufacturers instructions. A vertical guide assembly weighing 3 kg +/- 0.02 kg in total is attached via a cable or strapping* to a hook which attaches to the rear of the headgear. A drop weight of 4 kg +/- 0.02 kg can be moved up the guide assembly and dropped onto the anvil in a substantially frictionless fall through a distance of 175 mm +/- 5 mm. *Note: The cable or strapping shall be of a material having an elongation of no more than 5mm per 300mm when loaded with a 22 kg weight in the free hanging position. Last update: 14 January, 2015 203
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