Patent ID: 8453481

Claim:
A padlock comprising: a lock body, a shackle having long and short legs receivable in corresponding first and second shackle openings in the lock body, the shackle being moveable in an axial direction between a retracted position and an extended position, the short leg being withdrawn from the lock body in the extended position; and a locking mechanism disposed in the lock body, the locking mechanism comprising: a locking member; a blacker movable in an axial direction with respect to the lock body and having a blocking surface configured to hold the locking member in locking engagement with the shackle when the blocker is in a shackle engaging position, and further configured to allow the locking member to disengage from the shackle when the blocker is in a shackle disengaging position, to permit movement of the shackle from the retracted position to the extended position; a latch member movable between a blocker obstructing position obstructing movement of the blocker from the shackle engaging position to the shackle disengaging position and a blocker clearance position permitting movement of the blocker from the shackle engaging position to the shackle disengaging position in response to an axial force applied to the shackle; and a driver operable in response to proper user manipulation of the lock to move the latch member from the blacker obstructing position to the blacker clearance position to permit movement of the blocker to the shackle disengaging position, the driver being inoperable prior to proper user manipulation of the lock.