Patent ID: 7770421

Claim:
A padlock comprising: a housing defining an opening in a wall thereof to communicate an interior space of the housing and the outside of the housing; a shackle mounted on the housing and having a first end formed with a shaft portion movably mounted in the housing, and a second end formed with a locking portion moved with the shaft portion, extended from the shaft portion and located outside the housing; a lock mechanism mounted on the housing and including: a lock core positioned in the housing; and a limit knob having a driving member and a button, the driving member being partly received in the housing via the opening and having one end connected with the button and the other end connected with the lock core, the button being positioned outside the housing, wherein the driving member is capable of being rotated by the lock core so as to drive the button to move to a first position where the locking portion of the shackle is confined in the button and a second position where the locking portion is released from the button; and a movable block disposed on the driving member of the limit knob; wherein the movable block moves along the driving member to a predetermined position outside of the housing when the limit knob is rotated by the lock core to have the button move from the first position to the second position; and the movable block is kept at the predetermined position when the limit knob is again rotated by the lock core to have the button move from the second position back to the first position.