Patent ID: 7748759

Claim:
An unlocking mechanism for a door lock that can be applied to a left-hand door or a right-hand door, comprising: upper and lower cam mechanisms; a slide plate disposed between said upper and lower cam mechanisms and driven by said lower cam mechanism to drive said upper cam mechanism; said upper cam mechanism including a spindle, and an upper cam body mounted on said spindle and having a tab projecting from said upper cam body to be rotated by said slide plate, said upper cam body being rotatable relative to said spindle to change said tab between a left-hand installation configuration for a left-hand door installation and a right-hand installation configuration for a right-hand door installation; said upper cam mechanism including an engagement unit to interengage said upper cam body and said spindle for simultaneous rotation when said tab is in said left-hand, or right-hand installation configuration; said engagement unit including a first and a second engaging members provided on said upper cam body to engage said spindle, one of said first and said second engaging members engaging said spindle when said tab is in one of said left-hand and right-hand installation configurations; said spindle having a cam-holding portion, said upper cam body further having a sleeve portion sleeved rotatably around said cam-holding portion and having a notch, and two angularly spaced apart notch edges bounding said notch and defining said first and second engaging members, respectively; and said cam-holding portion haying a pin projecting radially and outwardly from said cam-holding portion and into said notch to engage one of said first and second engaging members.