Tue, 17 Apr 2012 22:18:37 +0200 __Maciek <i...@c...org>
napisał:

>powrotem, może uda się gdzieniegdzie jakoś przymocować zawiasy meblowe
>żeby rozkładanie było szybsze.

O kurde, okazuje się że jest coś takiego:

Wklepałem w google "foldable motorcycle helmet"
https://www.google.pl/search?q=foldable+motorcycle+h
elmet

I wyskoczyło m.in.
http://www.autoblog.com/2011/05/28/folding-motorcycl
e-helmet-nominated-for-dyson-award/

Twenty-five-year-old Australian Jessica Dunn spent five months riding
a motorcycle in Indonesia as a foreign exchange student, and that
meant hauling a helmet around all that time. Weary of that grind after
just 150 days, Dunn developed the Proteus folding helmet and it is now
shortlisted for the James Dyson Award.

An outer layer of polycarbonate covers polystyrene foam, and the
innermost layer is a material that's pliable during normal use but
instantly hardens when it registers an impact. The helmet itself
collapses in a manner reminiscent of a hardtop convertibles, the visor
slides back on top while the sides and back fold into the helmet's
interior cavity. The Proteus helmet has been engineered to meet
Australian safety standards, and when folded fits into a standard
backpack. Have a look at the gallery of high-res images for a better
view, and if you think that's funky, you should check out Julien
Bergignat's Tatou helmet.

Widać nie byłem pierwszy z takim pomysłem...