Abstract: A window stop (10) for limiting movement of a sliding window along a predetermined path of window movement is provided. The window stop (10) has a housing (12) having a cavity (20) wherein the housing (12) is adapted to be positioned adjacent the path of window movement. A bolt (14), operatively associated with the cavity (20), is moveable between a first position (BP1) within the housing (12) and thereby out of the path of window movement, and a second position (BP2) extending out of the housing (12) into the path of the window movement whereby the window is able to contact the bolt (14). An actuator (16) is pivotally supported by the bolt (14) between a first position (AP1) locking the bolt (14) within the housing (12) and a second position (AP2) allowing the bolt (14) to extend to its second position (BP2). A spring (58) biases the bolt toward its second position. The bolt (14) receives forces from the window contacting the extended bolt (14).

Abstract: A sash balance brake assembly for a sash window system. The sash window system includes a window frame having a pair of generally parallel tracks. Each of the tracks has an outer wall, front and back intermediate walls and front and back inner walls collectively defining a channel. A sash window is transversely disposed between the tracks and is adapted for slidable movement along the tracks. A pair of sash balance assemblies provide a generally upward bias on transverse sides of the sash window. The sash balance brake assembly comprises a rotor rotatable about a rotor axis, a bolt having a generally planar engaging surface, a slider body for placement in a respective one of the channels and for coupling to a respective one of the sash balance assemblies. The slider body includes an aperture for rotatably supporting the rotor adjacent the bolt.

Abstract: A slidable counterbalance assembly adapted for a sash window assembly disposed within a master frame is disclosed. A coiled leaf spring mounted on the counterbalance assembly has its upper end attached to the top of the guide rail channel of the master frame. A flexible strap is attached at one end to the sash window pivot brake and at the other end to the counterbalance assembly.

Abstract: An economical, efficient window stop includes a narrow, flat housing having first and second cavities for respective flat, narrow bolt and latch. The bolt is spring braced and movable between a first portion within the cavity and a second position extending from the cavity. The latch is spring biased and moves transverse to the movement of the bolt. High strength molded plastic construction with guide means and close tolerances allow efficient distribution of forces from the extended bolt to the housing.

Abstract: A sash balance brake and pivot pin assembly for a sash window which maintains the window substantially square prior to installation is disclosed. The pivot pin extends outwardly from the window sash. The sash balance brake is disposed within a track in the window frame and includes a cam rotatably disposed within an expandable housing. The pivot pin has a collar for lateral engagement with the cam to prevent the window frame from bowing away from the window sash, thereby maintaining the window frame substantially square.

Abstract: A roller for a window or door slidably mounted on a track is disclosed. The roller comprises a housing having first and second opposing walls and a shelf having a convex outer surface and extending between the first and second walls. A belt encircles the shelf. The belt has an inner surface having a low coefficient of friction for sliding engagement with the convex surface of the shelf. The belt further has an outer surface having a high coefficient of friction adapted for non-sliding engagement with the track.

Abstract: A pivot corner adapted for operative engagement with a sash balance brake assembly of a pivotable sash window is disclosed. The pivot corner comprises a housing having an axial bore and a pivot pin. The pivot pin has a first portion disposed within the bore and a second portion extending outwardly therefrom and adapted for operative engagement with the brake assembly. The axial bore and the first pin portion are complementarily octagonal in cross-section. The first pin portion has a cross-section sufficiently smaller than the cross-section of the axial bore to permit non-destructive rotation of the pin relative to the housing upon application of a predetermined torque.

Abstract: A security lock for a double-hung sash window assembly which is to be mounted in a stile of a sash frame to limit movement of a lower sash frame relative to an upper sash frame. The lock includes a casing adapted to be mounted within a recess formed in the upper sash frames, and a faceplate on the casing having an opening therein communicating with an interior casing cavity. A tumbler pivots in the cavity and is spring biased by a leaf spring to normally project through the opening to engage the lower sash in a locking position. The leaf spring is mounted completely within the casing cavity normally to bias the tumbler into its extended, locking position, but permitting the tumbler to be completely retracted within the casing cavity so that the lower sash frame can be raised and moved past the tumbler. The tumbler and casing wall include interlocking protrusions to prevent over-rotation of the tumbler during engagement with the lower sash frame. The lock can be supplied as an assembled unit for installation.

Abstract: A pivot latch adapted for releasably securing a pivotable sash window to a master frame. The master frame has opposed, vertically extending guide rails. The sash has a hollow top sash rail, a base and a pair of hollow stiles cooperatively connected together at adjacent extremities thereof to form a rectangular sash frame. The top sash rail includes a pair of opposing header slots. Each of the header slots forms a pair of opposing, longitudinal header rails. The pivot latch comprises a housing having an outward end opening. A latch bolt is disposed within the housing. The pivot latch further includes a spring for biasing the latch bolt outwardly through the outward end opening and is adapted for engaging one of the guide rails. The housing has a cover having longitudinal edges and a pair of side walls depending from the cover and disposed inward of the edges.