The subject innovation is not to a relates to a structure for preventing unlocking the lock, the actuating member and the operating member to vary the position of the pin installed in the body even when switching the actuating member from a free state rotation.; The subject innovation is a pinhole (2) a pin hole (3) is circumferentially such as the distance is to be formed in the body (1) be a first guide groove 20 formed on the side of keeping the body (1 arranged in series ), the operating member at one side of the operation member (4) fitted opposite to the first guide groove 20 and the second guide groove (21 a formed to be selectively opposite), and the second guide groove 21 in the and a cap 7, a guide groove 22 formed in the coupling (4), wherein as soon located in the second guide groove (20,21) as well as a cap (7) which is supported on the inner stem (8) ends as will the locking means 23.
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