Patent ID: 6807833
Filing Date: 2004-10-26
Classification: E05B,Y10T

Abstract:
A unlocking device for a lever handle door lock, comprising:an inner lever mechanism having an inner lever; an outer lever mechanism having an outer lever corresponding to the inner lever; a latch bolt unit including a first cam, a second cam and a dead bolt coupled to the first cam, and turning one of the first cam and the second cam can retract the dead bolt; and a latch bolt actuating unit provided with a first actuating rod, a second actuating rod and an actuating stick, the first actuating rod is aligned with the second actuating rod, and thus the actuating stick passes through the first actuating rod and the second actuating rod when assembled; the first actuating rod having a first end connected to the inner lever mechanism, and a second end connected to the first cam of the latch bolt unit for driving it, the first end provided with a guiding groove while the second end providing with a first engaging portion; the second actuating rod having a first end provided with a control cylinder to connect to the outer lever mechanism and the actuating stick, and a second end connected to the second cam of the latch bolt unit for driving it, the first end further provided with a limiting plate while the second end providing with a second engaging portion adapted to engage/disengage with/from the first engaging portion of the first actuating rod; the actuating stick having a guiding rod being confined within the guiding groove of the first actuating rod to constitute a combination of the first actuating rod and the actuating stick, and at least one lug abutted on the control cylinder of the second actuating rod to allow a longitudinal movement between the combination of the first actuating rod and the actuating stick and the second actuating rod; wherein when the lever handle door lock is situated in a locking state, the first engaging portion of the first actuating rod is engaged with the second engaging portion of the second actuating rod; the outer lever of the outer lever mechanism is not allowed to turn; and the inner lever of the inner lever mechanism is allowed to turn the first actuating rod and the second actuating rod so that the lever handle door lock is unlocked; and wherein when the lever handle door lock is situated in an unlocking state, the first engaging portion of the first actuating rod is disengaged and separated from the second engaging portion of the second actuating rod; the inner lever of the inner lever mechanism is able to turn the first actuating rod; and the outer lever of the outer lever mechanism is not allowed to turn the first actuating rod but to turn the second actuating rod so that the outer lever can avoid turning the first actuating rod by accident.