Product: Weapon: Blade
Fan Mine   (+1, -1)  [vote for, against]
A rapidly rotating blade around a precious object.

This could be an element of a home security system. When an intrusion is detected the blade protruding from the object begins to rotate at high speed; faster than sight.

At faster than sight speed, the blade strikes the intruder's hand when they reach for the shiny item.
-- rcarty, Oct 17 2013

Perhaps there's a non-maiming application for this tech? Chopping herbs?
-- the porpoise, Oct 17 2013

Not inside a vacuum, they don't.
-- Alterother, Oct 17 2013

//Not inside a vacuum, they don't.//

That would also render moot the other detectability problem, being motor sound. Maybe this idea would be viable inside a largish bell jar, preferably with an airlock to permit the thief to enter.
-- the porpoise, Oct 17 2013

What would prevent the thief from stealing the bell jar?
-- Canuck, Oct 18 2013

Micron thin blades. No blade tilt, no wind.

//At faster than sight speed//

-- 2 fries shy of a happy meal, Oct 18 2013

"You could tell if you were hiring an experienced Burglar by asking him to hold his hands up." said Bilbo to Gandalf.
-- popbottle, Oct 18 2013

//Not inside a vacuum, they don't.//

Items of sentimental value should be stored in outer space, where the cost of going to steal them would exceed their value to a thief. It works well with stars.
-- pertinax, Oct 21 2013

My daddy was a fan miner. He died of the windy lung.
-- the porpoise, Oct 21 2013

random, halfbakery