| 摘要 |
A coin-operated locking device for interlocking two or more supermarket trolleys stored in a row, where each trolley has one unit of the lock attached to the side of the trolley. A chain is attached to the trolley frame, where said chain has a key in the free end to be inserted and secured by the lock of the next trolley in the row but not in the lock attached to the same trolley. The device has two orifices, one for inserting a coin and another one where said key is inserted and secured. To release this key the user must insert a coin into the locking device and turn one lever. This rotative motion will trap the coin inside the lock while freeing the key. An internal mechanism will lock the mechanism rotation, and the access to the coin, until the key is inserted again.
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