Cup lock shackles

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A cup locking shackle does need either padlock nor key to lock it in place.

You close the shackle, push the cup shaped piece over the two flat parts, and then pass a chain through the aligned cross-shaped holes. The chain used may have a block at one end. Place a lock on the other end or secure it in some other reliable way.

Then you cannot pull the chain out of the hole, the cup cannot be taken off the shackle which in turn cannot be opened.


Original work or information from: http://www.fortunecity.de/lindenpark/klimt/598/kapsel.html#main

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