Today’s invention is a collapsible bicycle helmet.
It consists of an outer bag with hemispherical bulges moulded into it of different sizes.
Each bulge contains an aluminium boss bonded to a rubbery base. The bosses are of slightly different sizes so that they nest conveniently together when removed from the bag and fit into it for ease of carrying eg in a pocket.
The bosses’ rubber bases make contact with the wearer’s head and are held in place by a drawstring around the base of the bag.
In an accident, the bosses sustain damage and dissipate any impact loading across a wide area of the skull.