| 摘要 |
The shock absorption of a safety helmet is considerably improved by introducing into the space surrounded by the helmet shell an insert made of an air-cushion sheet (4) which is preferably adapted to the shape of the helmet and consists of at least two plastic films (8, 9) which are connected to each other and have a plurality of air-filled cells (7) which are enclosed between them and arranged closely adjacently. In the case of helmets to be newly produced, this insert is expediently inserted between the conventional shock-absorbing helmet lining (3) made of elastic material, such as polystyrene on one side and the hard helmet shell (2) on the other side and is preferably bonded to the helmet shell and/or the lining. However, the air-cushion insert can also be placed in an existing finished helmet. The rigidity and thickness of the individual films forming the air-cushion sheet are just as important as the dimensions, spacings and, to a lesser extent, also the arrangement and shape of the air-filled cells. The shock absorption of safety helmets, which has DIN (4848) values between 10000 and 14000 N in the case of commercially available good brand helmets - the most favourable values known are about 8000 N, can be improved by this measure to 5000 to 6000 N. <IMAGE> |
