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A sash lock (10) is provided for a sash window assembly (12). The sash window assembly includes an upper sash window (14) and a lower sash window (16). Each of the sash windows (14, 16) are mounted within opposed guide rails (20) on a master frame (22) wherein at least one of the sash windows is sli

A sash lock (10) is provided for a sash window assembly (12). The sash window assembly includes an upper sash window (14) and a lower sash window (16). Each of the sash windows (14, 16) are mounted within opposed guide rails (20) on a master frame (22) wherein at least one of the sash windows is slidable within the frame (20) relative to the other sash window. The sash window assembly (12) further includes a keeper (26) for mounting on a rail of one of the sash windows. The keeper (26) includes a keeper surface (26a). The sash lock (10) includes a locking assembly (28) for mounting on an adjacent rail of the other of the sash windows. The locking assembly ( 28) includes a housing (30) having an aperture (32), an actuator arm (34) having a shaft (38) disposed along a rotational axis and within the aperture (32) of the housing ( 30), and a cam (36) having a cam surface (36a) for engaging the keeper surface (26a) of the keeper ( 26). The cam (36) also includes an engagement member (40, 52) to engage the shaft (38) of the actuator arm (34). The housing (30) of the locking assembly (28) includes two alignment tabs (33) that are each adapted to engage one of two alignment surfaces (26d) of the keeper (26).

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What is claimed is: 1. A sash lock for a sash window assembly, the sash window assembly including an upper sash window and a lower sash window, each of the sash windows mounted within opposed guide rails on a master frame, wherein at least one of the sash windows is slidable within the frame relati

What is claimed is: 1. A sash lock for a sash window assembly, the sash window assembly including an upper sash window and a lower sash window, each of the sash windows mounted within opposed guide rails on a master frame, wherein at least one of the sash windows is slidable within the frame relative to the other sash window and one of the windows having a keeper mounted on a rail, the keeper including a keeper surface, the sash lock comprising: a locking assembly for mounting on a rail of the window without the keeper, the locking assembly including: a housing having an aperture; an actuator arm having a shaft disposed along a rotational axis and within the aperture of the housing; and a cam having a cam surface adapted for engaging the keeper surface of the keeper and at least one engagement member that engages the shaft of the actuator arm wherein the cam includes a thru-hole and the shaft includes a blind hole adapted to accept a screw disposed within the thru-hole of the cam wherein the shaft includes at least one slot peripherally disposed about the blind hole that correspondingly engages with the at least one engagement member of the cam wherein the at least one peripherally-disposed slot defines at least one shaft portion peripherally disposed about the blind hole wherein the at least one shaft portion deflects and squeezes the at least one engagement member of the cam in response to advancement of the screw disposed within the thru-hole of the cam and the blind hole of the shaft when torque is applied to the screw during assembly. 2. The sash lock of claim 1, wherein the housing and the actuator arm are formed of a plastic material and the cam is formed of a metal material. 3. The sash lock of claim 1, wherein the shaft includes three slots peripherally disposed about the blind hole and the cam includes three engagement members that correspondingly engage the slots. 4. A sash lock for a sash window assembly, the sash window assembly including an upper sash window and a lower sash window, each of the sash windows mounted within opposed guide rails on a master frame, wherein at least one of the sash windows is slidable within the frame relative to the other sash window, and one of the windows having a keeper mounted on a rail, the keeper including a keeper surface, the sash lock comprising: a locking assembly for mounting on a rail of the window without the keeper, the locking assembly including: a housing having an aperture; an actuator arm having a shaft disposed along a rotational axis and within the aperture of the housing; and a cam having a cam surface adapted for engaging the keeper surface of the keeper, a face surface, and at least one projection extending transversely beyond the face surface toward the shaft to engage the shaft of the actuator arm wherein the cam includes a thru-hole and the shaft includes a blind hole adapted to accept a screw disposed within the thru-hole of the cam wherein the shaft includes three slots peripherally disposed about the blind hole and the cam includes three projections that are correspondingly received by the slots wherein the three peripherally-disposed slots define three shaft engagement portions each having a generally wedge-shaped cross-section taken perpendicular to the rotational axis of the actuator arm wherein the three shaft engagement portions deflect and squeeze the projections of the cam in response to advancement of a screw disposed within the thru-hole of the cam and the blind hole of the shaft when torque is applied to the screw during assembly. 5. The sash lock of claim 4, wherein the housing and the actuator arm are formed of a plastic material and the cam is formed of a metal material. 6. A sash lock for a sash window assembly, the sash window assembly including an upper sash window and a lower sash window, each of the sash windows mounted within opposed guides on a master frame, wherein at least one of the sash windows is slidable within the frame relative to the other sash window, and one of the windows having a keeper mounted on a rail of the window, the keeper including a keeper surface, the sash lock comprising: a locking assembly for mounting on a rail of the window without the keeper, the locking assembly including: a housing having an aperture; an actuator arm having a shaft disposed along a rotational axis and within the aperture of the housing, the shaft having a blind hole and threes lots peripherally disposed about the blind hole, the three slots defining three shaft engaging portions each having a generally wedge-shaped cross section taken perpendicular to the rotational axis of the actuator arm; and a cam having a cam surface for engaging the keeper surface of the keeper, the cam further having three finger-like projections extending generally parallel to the rotational axis of the actuator arm, each finger like projection being received and engaged by a respective slot to operably couple the cam to the shaft, the cam further including a through hole; wherein the blind hole is adapted to accept a screw disposed within the thru-hole of the cam and wherein the three shaft engaging portions are adapted to deflect and squeeze the projections of the cam in response to advancement of the screw disposed within the thru-hole of the cam and the blind hole of the shaft when torque is applied to the screw during assembly. 7. The sash lock of claim 6, wherein the keeper, the housing, and the actuator arm are formed of a plastic material and the cam is formed of a metal material. 8. A sash lock for a sash window assembly, the sash window assembly having an upper sash window and a lower sash window, each of the sash windows mounted within opposed guide rails on a master frame, wherein at least one of the sash windows is slidable within the frame relative to the other sash window and one of the sash windows having a keeper mounted on a rail, the keeper having a keeper surface, the sash lock comprising: a locking assembly comprising: a housing having an aperture, the housing adapted to be mounted on a rail of the sash window without the keeper; an actuator arm having a shaft disposed along a rotational axis and within the aperture of the housing the shaft having a shaft engagement portion; and a cam having a cam surface adapted for engaging the keeper surface of the keeper, the cam having an engagement member that engages the shaft of the actuator arm the engagement member comprising a protrusion wherein the shaft engagement portion deflects and compresses the protrusion in response to a screw inserted into a thru-hole of the cam and a blind hole of the shaft. 9. The sash lock of claim 8, wherein the shaft has a slot that receives the engagement member. 10. The sash lock of claim 8, wherein the shaft has a slot and the protrusion is received by the slot. 11. The sash lock of claim 10, wherein the protrusion has a side surface and the slot defines a shaft engagement portion wherein the side surface engages the shaft engagement portion. 12. The sash lock of claim 8, wherein the protrusion has an end surface that engages the screw. 13. The sash lock of claim 11, wherein a cavity is defined adjacent the protrusion, the shaft engagement portion being received by the cavity. 14. The sash lock of claim 10, in the engagement member further comprises a projection adjacent the protrusion, the projection being received by the slot. 15. The sash lock of claim 8 wherein the engagement member comprises a plurality of spaced protrusions and the shaft having a plurality of spaced slots, each protrusion being received by a slot. 16. The sash lock of claim 15 wherein cavities are defined between the spaced protrusions on the cam and shaft engagement portions are defined between the slots of the shaft, each shaft engagement portion being received by a respective cavity. 17. The sash lock of claim 16 wherein the engagement member further comprises a projection adjacent each protrusion, the projections being received by the slots. 18. The sash lock of claim 8 wherein the engagement member comprises three protrusions, each protrusion having a projection adjacent thereto, the protrusions being spaced by three cavities, and the shaft having three slots spaced by three shaft engagement portions, each slot receiving a projection and protrusion and each cavity receiving one of the shaft engagement portions. 19. The sash lock of claim 18 wherein shaft engagement portions deflect and squeeze the protrusions and projections in response to a screw inserted into a thru-hole of the cam and blind hole of the shaft. 20. The sash lock of claim 8 wherein the housing and the actuator arm are formed of a plastic material and the cam is formed of a metal material. 21. A sash lock for a sash window assembly, the sash window assembly including an upper sash window and a lower sash window, each of the sash windows mounted within opposed guide rails on a master frame, wherein at least one of the sash windows is slidable within the frame relative to the other sash window, the sash lock comprising: a keeper for mounting on a style of one of the sash windows, the keeper including a keeper surface; and a locking assembly for mounting on an adjacent style of the other of the sash windows, the locking assembly including: a housing having an aperture; an actuator arm; a cam having a cam surface for engaging the keeper surface; and a shaft extending through the housing aperture and operably coupling the actuator arm to the cam; the housing and the shaft adapted to limit rotational travel of the actuator arm to define unlocked and locked position wherein the actuator arm engages a protrusion of the housing in the unlocked position and in the locked position. 22. The sash lock of claim 21, wherein the keeper, the housing, the actuator arm and the shaft are formed of plastic and the cam is formed of metal. 23. A sash lock for a sash window assembly, the sash window assembly including an upper sash window and a lower sash window, each of the sash windows mounted within opposed guide rails on a master frame, wherein at least one of the sash windows is slidable within the frame relative to the other sash window, the sash lock comprising: a keeper for mounting on a style of one of the sash windows, the keeper including a keeper surface; and a locking assembly for mounting on an adjacent style of the other of the sash windows, the locking assembly including: a housing having an aperture; an actuator arm having a shaft; a cam having a cam surface for engaging the keeper surface; and a shaft extending through the housing aperture and operably coupled to the cam, the shaft and the housing arranged to cooperatively limit rotational travel of the arm with respect to the housing wherein the shaft and the aperture have corresponding surfaces; the shaft has a shaft projection extending from its circumferential surface; and the aperture has two spaced aperture projections on its circumferential surface, wherein the shaft projection engages one of the aperture projections to define an unlocked position and engages the other aperture projection to define a locked position. 24. The sash lock of claim 23, wherein the keeper, the housing, the actuator arm and the shaft are formed of plastic and the cam is formed of metal. 25. A sash lock for a sash window assembly, the sash window assembly having an upper sash window and a lower sash window, each of the sash windows mounted within opposed guide rails on a master frame, wherein at least one of the sash windows is slidable within the frame relative to the other sash window and one of the sash windows having a keeper mounted on a rail, the keeper having a keeper surface, the sash lock comprising: a locking assembly comprising: a housing having an aperture, the housing adapted to be mounted on a rail of the sash window without the keeper; an actuator an having a shaft disposed along a rotational axis and within the aperture of the housing; and a cam having a cam surface adapted for engaging the keeper surface of the keeper, the cam having an engagement member that engages the shaft of the actuator arm wherein the engagement member comprises three protrusions, each protrusion having a projection adjacent thereto, the protrusions being spaced by three cavities, and the shaft having three slots spaced by three shaft engagement portions, each slot receiving a projection and protrusion and each cavity receiving one of the shaft engagement portions and wherein the shaft engagement portions deflect and squeeze the protrusions and projections in response to a screw inserted into a thru-hole of the cam and blind hole of the shaft. 26. A sash lock for a sash window assembly, the sash window assembly having an upper sash window and a lower sash window, each of the sash windows mounted within opposed guide rails on a master frame, wherein at least one of the sash windows is slidable within the frame relative to the other sash window and one of the sash windows having a keeper mounted on a rail, the keeper having a keeper surface, the sash lock comprising: a locking assembly comprising: a housing having an aperture, the housing adapted to be mounted on a rail of the sash window without the keeper; an actuator arm having a shaft disposed along a rotational axis and within the aperture of the housing, the shaft having a slot; and a cam having a cam surface adapted for engaging the keeper surface of the keeper, the cam having an engagement member comprising a protrusion and a finger like projection adjacent the protrusion wherein the protrusion and the finger like projection are received by the slot. 27. The sash lock of claim 26 wherein the shaft further comprises a second and third slot and the cam further comprises a second engagement member having a second protrusion and a second finger like projection adjacent the protrusion and a third engagement member having a third protrusion and a third finger like projection adjacent the protrusion wherein the second slot receives the second protrusion and second finger like projection and the third slot receives the third protrusion and third finger like projection.