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Housing for installation in a window frame having a window sash with a notch defining a pair of opposed edges. Each housing includes side walls and a top wall extending beyond the side walls to define a flange. Each housing further includes protuberances, such as triangular protuberances, projecting

Housing for installation in a window frame having a window sash with a notch defining a pair of opposed edges. Each housing includes side walls and a top wall extending beyond the side walls to define a flange. Each housing further includes protuberances, such as triangular protuberances, projecting from the side walls. Each protuberance is spaced from the flange to define respective gaps for receiving opposed edges therein.

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1. A housing for installation in a window frame having a window sash with a notch defining a pair of opposed edges, the housing comprising:side walls; a top wall extending beyond the side walls to define a flange; side protuberances projecting from the side walls, each side protuberance having an ac

1. A housing for installation in a window frame having a window sash with a notch defining a pair of opposed edges, the housing comprising:side walls; a top wall extending beyond the side walls to define a flange; side protuberances projecting from the side walls, each side protuberance having an acute apex spaced from the flange to define respective gaps for receiving the opposed edges therein, and a bolt movably disposed in the housing and adapted for engaging a slide channel. 2. A housing according to claim 1, further comprising a rear wall and a rear protuberance projecting from the rear wall, the rear protuberance being spaced from the flange to define a gap for receiving an edge of the window sash.3. A housing according to claim 2, wherein the side protuberances and rear protuberance are flared outwardly from the side walls and rear wall respectively, forming a plurality of vertical ramping surfaces.4. A housing according to claim 1, wherein the apexes of the side protuberances face the flange.5. A housing for installation in a window frame having a window sash with a notch defining a pair of opposed edges, the housing comprising:side walls; a top wall extending beyond the side walls to define a flange; a plurality of retainers defined by triangular protuberances at each side wall, a portion of the triangle of each protuberance spaced from the flange to define respective gaps for receiving the opposed edges therein; and a plurality of fingers spaced apart along each of the side walls, the fingers projecting from the retainers toward the flange and into a corresponding one of the respective gaps. 6. A housing according to claim 5, wherein the fingers have a thickness permitting flexing thereof.7. A housing according to claim 5, wherein the protuberances are flared outwardly from the side walls.