COMBINATION PADLOCK WITH ANTI-PICK AND ANTI-PEEK MECHANISM

摘要

A combination lock having a plurality of dials and clutches arranged to control a lock shackle is disclosed. Each of the dials is mounted on a different clutch to form a dial-clutch pair. The clutch has a protrusion and the dial has an open slot dimensioned to receive a protrusion and a plurality of faulty notches. The protrusion is so located that when the lock is in the lock mode, the protrusion in each of the dial-clutch pairs is disengaged from the open slot, allowing the dial to rotate relative to the clutch. Since the clutches do not turn along with the dials and the faulty notches look similar to the open slot, it would be difficult for an intruder to pick the lock by peeking the protrusion of the clutches while rotating the dials.

主权项

1. A combination lock operable at least in a lock mode and an open mode, the combination lock comprising:
a lock body; a shackle having a long leg and a short-leg; a stack of clutches, each clutch having a hole defining an inner surface and a protrusion on an outer surface, the hole arranged to receive the long leg of the shackle; and a plurality of dials rotatably mounted on the stack of the clutches to form a combination code, each of the dials arranged to mount on a different one of the clutches to form a dial-clutch pair, wherein the lock body comprises a body portion to house the long leg of the shackle and a lock hole spaced from the body portion arranged to receive the short leg of the shackle when the lock is operated in the lock mode, the body portion comprising a plurality of separation sections and a plurality of gaps separating the separation sections, wherein each of the gaps and one of the adjacent separation sections are associated with a dial-clutch pair, and wherein the dial comprises an inner ring, the inner ring having an inner diameter to receive the clutch and an open slot dimensioned to receive the protrusion of the clutch at least when the lock is operated in the open mode.