Patent ID: 7596975

Claim:
An improved lock mechanism comprising: an anti-pry shield having a hollow body with a first end and a second end, and a cylindrical shield at its first end, the anti-pry shield having a cylindrical flange at its second end; a knob-set cylinder having a plug with a key end and a driver end; a monolithic cylinder guard having a body with a beveled exterior side wall between a first end and a second end, the second end having a bore, a cylinder receiver having a cavity open to the first end, the cavity adapted to receive the knob-set cylinder from the first end, the cavity open to the bore in the second end, the bore adapted to receive the key end of the plug, the monolithic cylinder guard having an annular groove around the cylinder receiver open to the first end, the cylindrical flange of the anti-pry shield adapted to be received within the groove; and a cover having a beveled exterior side wall between an open first end and a covered second end, the cover permanently secured to and received on the monolithic cylinder guard, the covered second end of the cover having a bore coaxial with the bore in the second end of the monolithic cylinder guard and the plug of the knob-set cylinder.