Lock structure

A lock structure comprising:

• an upper shell and a lower shell, a traverse through hole being formed between the assembled upper and lower shells, a coin insertion slot and a key plate insertion slot being oppositely formed on the upper shell, a stopping mechanism being pivotally mounted inside the upper shell, a restoring mechanism being mounted below the stopping mechanism, the restoring mechanism and the stopping mechanism being driven and shifted by each other, two swing arms being oppositely, pivotally mounted on the stopping mechanism, two arc-shaped, recessed edges being formed on front ends of the swing arms, respectively, two hooks being mounted inwardly on rear ends of the swing arms, respectively, a first spring being coupled with the rear ends of the swing arms for forming a front clipping opening and a rear clipping opening to clip a coin or a key plate, the restoring mechanism being composed of a second spring and two push plates, the push plates being coupled with two ends of the second spring, respectively, whereby when the swing arms are coupled with the upper shell via a coupling hole of the second spring, a diameter of the first clipping opening is formed in accordance with a diameter of the coin.