US Patent 7234173 Helmet attachment apparatus and methods

Helmet attachment apparatus and methods are disclosed. In one embodiment, an apparatus for attaching a device to a helmet includes a first shell member coupled to a second shell member by at least one expandable member. The first and second shell members are adapted to approximately conform to first and second surface portions the helmet. When the first and second shell members are engaged with first and second engagement portions of the helmet, the expandable member is tensioned to secure the first and second shell members to the helmet. At least one of the first and second shell members includes a mount adapted to be attached to the device.