Patent ID: 6216500
Filing Date: 2001-04-17
Classification: E05B,Y10T

Abstract:
A device for unlocking a tubular-type door lock in conjunction with an indoor handle of said lock, comprising:a holed outdoor plate coupled to an outdoor handle of the door lock, said plate having a locking slot and defining an opening at a position outside the locking slot;a hollow shaft fitted into said holed outdoor plate;a bearing fixedly seated in said hollow shaft at a predetermined position;a hollow sleeve axially received in said hollow shaft to be movable in opposite directions and normally biased in a direction toward the indoor handle by a first spring located between said bearing and said sleeve, said sleeve thus being normally and rotatably positioned in said opening of the outdoor plate to be unlocked, but selectively engaging with the locking slot of the outdoor plate to be locked by the outdoor plate;a ratchet unit received in said hollow sleeve while being normally biased in a direction toward the indoor handle, said ratchet unit being operable in conjunction with said indoor handle, thus selectively moving said sleeve from a locked position into an unlocked position, said ratchet unit comprising:an unlocking ratchet positioned in the sleeve at a position toward the indoor handle, said unlocking ratchet having a first ratchet face including first top and bottom surfaces with a first slope surface extending between said top and bottom surfaces; anda locking ratchet positioned in the sleeve at a position toward the outdoor handle relative to said unlocking ratchet while being normally biased in the direction toward the indoor handle by a second spring located between an inside end surface of said sleeve and a flat face of said locking ratchet having a second ratchet face including second top and bottom surfaces with a second slope surface extending between said second top and bottom surfaces, said locking ratchet engaging with the unlocking ratchet at said first and second ratchet faces to be relatively slidable on said first and second slope surfaces in conjunction with movement of the indoor handle, thus being selectively movable in an axial direction to move the sleeve from the locked position into the unlocked position of the sleeve.