| 摘要 |
A fastening means for fitting an ear muff to a safety helmet has an arm which is mounted in a housing intended for attaching to the helmet. A pivoting end portion of the arm situated in the housing is acted on by a disc-type spring means arranged in the housing. The line of action of the spring force has a decreasing leverage to the pivoting location of the arm for increasing arm swing-out, the pivoting moment exercised by the spring means on the arm being substantially constant within a swing-out range normal for the arm when it is in use. This results in a contact force for the ear muff which is essentially independent of the amount of swing-out. |
