| 摘要 |
A helmet and/or helmet liner having one or more internal flexibility sipes for controlling and absorbing the impact of torsional or shear forces, including, for example, at least a first bladder, chamber, or compartment having an inner surface; a second bladder, chamber, or compartment having at least one cavity or void that at least partially encloses at least one gas, and an outer surface located in the first bladder, chamber, or compartment, as viewed in a cross-section, and at least one internal sipe, which is defined by a portion of the inner surface of the first bladder, chamber, or compartment and a portion of the outer surface of the second bladder, chamber, or compartment. The surface portions defining the internal sipe oppose each other and are configured to be movable relative to each other in a sliding motion and have at least one centrally located attachment between the surface portions. |
