Sash lock for a sash window

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.

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.

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.

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.

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.

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.

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.