US Patent 11685336 Vehilce-hood assembly including energy absorbers

A vehicle-hood assembly includes a vehicle hood and an energy absorber fixed to the vehicle hood. The energy absorber is releasable from a compressed position to an uncompressed position. The energy absorber includes a chamber that is sealed and vacuum pressurized in the compressed position. An actuator is configured to unseal the chamber to release the energy absorber from the compressed position to the uncompressed position.