The Amazing Chain Key

It is normally a given that a key has to be a hard rigid object, in order to insert it into the lock. However there is supposed to be an exception to every rule, and the Chain Key is the exception to the idea that a key has to be a hard, rigid object.

The actual key is totally flexible, and it sits inside a metal channel. Offer the channel up to the keyhole, and then slide the plastic handle, which causes the key to be inserted into the lock. Because the keyhole is the same width as the key, the key cannot flop about, and it slides smoothly into the keyhole.

See http://www.grand-illusions.com/acatal...

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  • Science & Technology

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