Patent ID: 8087322

Claim:
A mechanism for a window comprising: (a) a mechanism case; (b) a spindle, inserted into the case; (c) a screw mounting plate for mounting the mechanism to a surface by a pair of screws, the screw mounting plate having an aperture through which the spindle in the case freely passes; (d) a cover plate having an aperture through which the spindle freely passes and sized to substantially cover the mechanism and screw mounting plate; and (e) a retaining ring for fixed engagement with the aperture of the screw mounting plate, said retaining ring having an internal aperture through which the spindle passes and providing for the spindle to freely rotate within the internal aperture, the retaining ring incapable of passing through the aperture in the cover plate, the cover plate disposed between the retaining ring and the screw mounting plate, whereby the retaining ring secures the cover plate to the screw mounting plate and the screw mounting plate secures the mechanism case to the surface.