Patent ID: 6711922
Filing Date: 2004-03-30
Classification: E05B,Y10T

Abstract:
A mechanism of a combination lock for beginning and ending combination-changing operation, comprisinga spindle including a holding room at a front end portion, a holding slot for allowing insertion of a toothed lock bar therein, a plurality of through holes behind the holding room, and a plurality of locating gaps in front of the holding room; the combination changing mechanism being provided for effecting disengagement of tooth dishes from respective dials of a combination lock, which have spaced numerals on an outer side; the tooth dishes being fitted around the spindle to disengageably engage the toothed lock bar, and being biased towards the front end of the spindle to engage respective dials with a spring so that the tooth dishes will turn together with respective dials; a pad movably positioned in the holding room; the pad including a through hole for allowing the toothed lock bar to be passed through, and posts sticking out from a rear side thereof and passed through respective through holes of the spindle to come into contact with a most front one of the tooth dishes; a pressing block movably positioned in the holding room; the pressing block including a through hole for allowing the toothed lock bar to be passed through, and locating protrusions on a front side thereof to be separably engaged with the locating gaps of the spindle; and, a thimble fitted around the front end of the spindle for confining the pressing block therein; the thimble having a protrusion on an inner edge engaged with a cavity on the spindle; the pressing block being pressed towards a rear end of the spindle for the posts of the pad to move the tooth dishes towards a rear end of the spindle so that the tooth dishes are disengaged from respective dials, allowing the dials to be turned relative to respective tooth dishes for an unlocking numeral combination to be changed.