Patent ID: 7748758

Claim:
A cylinder lock comprising: inner and outer roses; inner and outer handles respectively extending through said inner and outer roses; a latch retractor adapted to be connected to a latch; a latch retractor housing receiving said latch retractor and having an inner cover plate and an outer cover plate opposite to said inner cover plate; inner and outer drive spindles respectively connected to and driven by said inner and outer handles, and extending into said latch retractor housing to operate said latch retractor, said inner drive spindle extending through said inner cover plate; a sleeve connected to said latch retractor housing and surrounding said outer drive spindle, said sleeve having a flange projecting radially from said sleeve and opposite to said inner cover plate, and said outer cover plate contacting said flange; an outer shell surrounding said inner drive spindle and associated with said sleeve to encase said latch retractor housing; and at least one rigid coupling member disposed within said outer shell and substantially parallel to a rotation axis of said inner and outer drive spindles; each of said inner cover plate and said flange having an edge notch, said edge notches of said inner cover plate and side flange being aligned with each other axially; said rigid coupling member having two opposite ends respectively formed with first and second slots that extend transversely of said rigid coupling member and that engage respectively said edge notches of side inner cover plate and side flange.