Patent ID: 7357010

Claim:
A plug assembly for a door lock comprising: a cylindrical barrel portion having a rear end, a fin portion radially formed on and protruding from the cylindrical barrel portion and a stop formed on and extending longitudinally from the rear end of the cylindrical barrel portion; a plug being mounted rotatably within the cylindrical barrel portion and having a rear end protruding out of the cylindrical barrel portion and a keyhole being defined axially through the plug, and the plug further comprising: a longitudinal hole defined in the rear end of the plug; a limiting spring disposed in the longitudinal hole of the plug; and a limiting rod disposed slidably in the longitudinal hole against the limiting spring; a driving shaft being mounted securely on the rear end of the plug, rotating simultaneously with the plug and comprising a body being attached to the rear end of the plug and having an outer surface, a non-circular cross section, a rear end, a driving hole defined coaxially in the rear end of the body of the driving shaft and a limit notch defined longitudinally in the outer surface of the body of the driving shaft, aligned with the longitudinal hole in the plug and receiving the limiting rod; a mounting cap mounted around the driving shaft and having a front end; a connecting hole corresponding to and engaging with the body of the driving shaft; and a reinforcing side wall formed on and extending longitudinally from the front end of the mounting cap to define a limiting notch in the front end of the mounting cap and having two ends, wherein the stop on the cylindrical barrel portion is received in the limiting notch in the mounting cap; and an adjusting cap mounted around the rear end of the plug, received in the mounting cap and having at least one limiting recess to hold the limiting rod inside.