Patent ID: 7426841

Claim:
A lock comprising: a lock body having an accommodation chamber, an opening in communication with the accommodation chamber, two insertion slots, and a plurality of through holes; a combination lock unit mounted inside the lock body, the combination lock unit having a movable locking frame and a plurality of numbered rotating discs pivotally mounted inside the lock body and respectively peripherally protruding out of the through holes of the lock body for rotating by the user to move the movable locking frame between a locking position and an unlocking position; a slidable box moveable into and out of the accommodation chamber through the opening of the lock body, the slidable box having a notch engageable with the movable locking frame when the movable locking frame is moved to the locking position; and a shackle having two ends insertable into the insertion slots of the lock body and provided with at least one engagement portion engageable in the lock body; wherein the at least one engagement portion of said shackle is a groove extending around a periphery of one of the two end of said shackle; and wherein said slidable box has a protrusion at one end thereof, which is engageable with the at least one engagement portion of said shackle in the lock body.