Key to activate the lock on a self-service trolley, uses key that is in the form of a conventional key but has the large circular end matching the size of a coin that will release the trolley lock, and has quick release from key ring

摘要

The key has the appearance of a conventional key, but the slot (4) to attach it to a key ring is in the end of the shaft (1) rather than the circular larger end (3). The key ring attachment uses a sliding lock (5) to allow easy removal of the key from the key ring. The circular end is the same size as a one euro coin or a ten franc piece, and is inserted in the lock to release the trolley.