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A simple metal ring spring (or two) wishes to spring open into
A large circle of waterproof material covers the spring ring.
Threads connected to the control handle in the center, and to
the ring spring, stop it from doing so. When released the
strings move up (just like the internal
spikes in a regular
umbrella) and you have an open umbrella that cannot turn
inside out (because the threads are holding it).
See my old Folding Wheel (collapsable) halfdea.
Folding wheel with similar technology
Folding Wheel (collapsable)
The folding wheel is more complex, because it must hold when pressed on. [pashute, Jul 21 2011]
||I like it. It would work and it has enormous potential for
mischievous misuse. [+]
||Oh, and the folding wheel is sort baked; check in the trunk
(boot) of a 1970s Porsche 911
||Regular umbrellas are under tension in use, relaxed when stored. This would be the other way.
||I can't. It's my other car. And my other is on a trip to
||define: safe. I thought this was about poking people's eyes (out).