Lockable sash assembly

A lockable sash assembly comprising:

• a lower sash having a sash rail with a face having a horizontal surface;
• an upper sash having a sash rail with a face having a horizontal surface wherein said lower sash is mounted parallel to said upper sash forming a small gap there between said faces of said sashes;
• a keeper defining an internal chamber which when mounted is substantially flush with said face of said horizontal surface of said upper sash;
• a dog formed in said internal chamber of said keeper;
• a sashlock assembly which when mounted is substantially flush with said face of said horizontal surface of said lower sash wherein said sashlock assembly comprises:
• a housing defined by walls which form a receiving chamber wherein said walls comprise an inner wall, an outer wall, and a top wall, wherein said top wall has radial lever-set grooves formed therein;
• a rotating device which includes a cam which is shaped to conform to said receiving chamber and engage said keeper, wherein said cam is rotatable within said housing to an openable and unopenable position;
• a rim formed around said cam which interacts with said dog wherein said dog maintains said small gap there between said faces of said sashes;
• a hub having a central opening, said hub which is included in said cam has an annular bottom surface;
• a lever having an end portion operably coupled to said central opening of said hub of said cam to assist said cam in rotation;
• a handle attached to said lever having ridges which provides positive feel when the lever is at either of said lever's extreme positions when said ridges interact with said grooves in said top wall;
• a locking device in said top wall of said sashlock assembly positioned radially outward from said cam capable of converting said cam in said housing to an unopenable condition, said locking device comprising:
• a key slot wherein the key slot is included within said locking device and wherein upon insertion of an appropriately shaped key into said key slot said locking device will be converted from a locked state to an unlocked state;
• an outer casing non-rotatably mounted to said housing;
• a tumbler assembly within said casing, wherein the tumbler assembly is moveable relative to the casing;
• a block pin mounted to said tumbler assembly, said pin extending generally parallel to and offset from the axis of rotation of said tumbler assembly in said housing so that said pin sweeps out a circular path as said locking device is converted from its locked state to its unlocked state.