1. Field of the Invention
The present invention relates to a combination lock, and more particularly to a combination lock having therein a knob rotatably mounted on the lock to activate/deactivate the locking mechanism of the lock.
2. Description of the Prior Art
In public places, such as the train station, the Gray Hound station or the Supermarkets and the malls, a large number of storage boxes are installed for users to temporarily store therein personal items. This kind of storing boxes normally has a built-in unlocking mechanism so that when the key to the storing box is lost or for any unknown reasons the key to the specific storing box is lost, the supervisor may always unlock the storing box. However, there is no way that the responsible authority is able to monitor all the users of the storing boxes, so that some users may copy the keys to the storing boxes when and even after they rent the storing boxes. Then these people may use the copied keys to unlock the storing boxes and steal whatever the items received inside the storing boxes.
To overcome the shortcomings, the present invention tends to provide an improved lock to mitigate the aforementioned problems.