Patent ID: 8182005

Claim:
A cylinder lock comprising: an inner handle; an inner drive spindle connected to said inner handle; an outer handle; an outer drive spindle connected to said outer handle; a latch retractor driven by said inner or outer drive spindle and adapted to retract a latch; a retractor case having inner and outer cover plates, and a middle cage connected between said inner and outer cover plates and receiving said latch retractor, each of said inner and outer cover plates having a central hole, and two radially extending and annularly spaced tongues, each of said tongues of said inner and outer cover plates being bifurcated to define a clamping groove therein; a shell having an enlarged tubular section, a constricted tubular section, and an annular shoulder formed between said enlarged and constricted tubular sections and adjacent said inner cover plate, said enlarged tubular section receiving said retractor case, said annular shoulder having two passage holes; and two annularly spaced reinforcing posts which are disposed inside said enlarged tubular section across said middle cage and said inner and outer cover plates and each of which has two opposite ends, said opposite ends of said reinforcing posts being respectively clamped by said clamping grooves of said tongues, said reinforcing posts respectively being aligned with said passage holes; wherein said inner surface of said enlarged tubular section is recessed to form at least two annularly spaced recesses that extend axially of said enlarged tubular section, each of said recesses being confined by two axially extending recess sidewalls that are spaced apart annularly, each of said tongues extending into a respective one of said recesses and having two opposite sides engaging said recess sidewalls of said one of said recesses; and wherein each of said reinforcing posts has two engagement slots formed respectively in said opposite ends thereof, each of said engagement slots of each of said reinforcing posts engaging an edge of a corresponding one of said tongues within a corresponding one of said clamping grooves.