Patent ID: 7254971

Claim:
A combination lock, comprising: a lock body having a first body portion defining a first latch opening and an opposed second body portion affixing to said first body portion and defining a second latch opening at said second body portion; a locking latch having a coupling end portion slidably mounted at said first latch opening and a detachable end portion detachably engaged at said second latch opening; a numerical actuation unit which comprises a lock releasing device, having two spaced apart through pushing holes, slidably supported in said lock body to lock up said detachable end portion of said locking latch at said second latch opening, a plurality of locking rings spacedly and coaxially disposed in said lock body to lock up said lock releasing device in a slidably movable manner, a plurality of ring-shaped number rotors rotatably provided on said lock body to coaxially engage with said locking rings respectively, wherein when said number rotors are rotated at a predetermined number-combination, said locking rings are driven to rotate to unlock said lock releasing device, such that said detachable end portion of said locking latch is free to detach from said lock body at said second latch opening; and a password reset unit which comprises a reset knob rotatably disposed in said second body portion of said lock body, and two disengaging members sliding along said two pushing holes of said lock releasing device respectively, wherein each of said disengaging members has a first end biasing against an inner side surface of said reset knob and a second end biasing against said locking rings in such a manner that when said rest knob is rotated within said second body portion of said lock body to push said disengaging members towards said first body portion thereof, said locking rings are slidably moved along said lock releasing device to disengage with said number rotors such that said number rotors are free to rotate on said lock body to reset a new number-combination, wherein when said reset knob is released that said locking rings are slidably returned back within said number rotors, said detachable end of said locking latch is unlocked once said number rotors are rotated at said new number-combination.