US Patent 7370497 Multifunctional padlock having shackle limit knob

A padlock includes a housing, a shackle, a limit knob, a movable member and a first locking mechanism. The shackle is movably mounted on the housing and has a root section extended into the housing and a free section having a first end extended from the root section and a second end extended outside of the housing. The limit knob is movably mounted on the housing to control movement of the free section of the shackle. The movable member is movably mounted in the limit knob. Additionally, the first locking mechanism is mounted in the housing to control movement of the limit knob and the movable member.