Patent ID: 7958567

Claim:
An apparatus for mounting fitting equipment to a protective helmet shell having an interior, an exterior, and a bore extending through the helmet shell between the interior and the exterior, the fitting equipment having an opening, the apparatus comprising: a fastener comprising: a screw having: a head at a first end thereof, a second end opposing the first end, and a shank portion which is adapted to extend through the bore, the bore having a diameter B; and a nut having a lip portion, the nut being connected to the screw at the second end thereof, the nut having a first portion having a diameter D and a second portion having a diameter d, the second portion being located between the first portion and the first end of the screw; and a grommet connected to the fitting equipment, the grommet having an inner diameter G, the grommet being inserted into the opening in the fitting equipment, the opening having a diameter larger than the diameter G, such that a gap is formed between the inner diameter of the grommet and the opening in the fitting equipment, wherein energy acting upon the grommet forces the grommet up the lip portion, dissipating the energy, wherein diameter D>inner diameter G>diameter d; and wherein diameter D>diameter B>diameter d.