Lock for casement windows

In a casement window having a frame including first and second spaced frame jambs, a head and a sill, and a sash including spaced sash sides and spaced sash ends about a sash panel, said sash being hinged to said first frame jamb for opening and closure, an improved casement window securement mechanism, comprising:

• a first sash catch on one of said sash sides;
• a second sash catch on said one sash side and being spaced apart from said first sash catch;
• a first cam rotatably mounted on said second frame jamb and being positioned for operative cooperation with said first sash catch during closure;
• a second cam rotatably connected to said second frame jamb and being positioned spaced from said first cam for operative cooperation with said second sash catch during closure;
• an elongated linkage arm connecting said second cam to said first cam for rotating said second cam in response to rotation of said first cam;
• means for momentarily delaying the initial rotation of said second cam until after commencement of rotation of said first cam whereby said second cam remains motionless after said first cam has begun rotation to catch said first sash catch and draw the window closer to a closed position, thereby positioning the second catch within reach of the second cam.