Abstract: A slide block is provided for slideably and pivotally mounting a window sash to a side member of a window frame having a vertical window jamb channel. The slide block includes a body, the body defining a sash pivot-receiving aperture. A sash pivot retainer spring is integrally formed with the body and is positionable between a first position obstructing removal of a sash pivot when the sash pivot is disposed in the aperture and a second position permitting removal of the sash pivot.

Abstract: Disclosed are apparatus for a snap lock balance shoe and system to be incorporated in pivotable double hung windows. In one embodiment, the snap lock balance shoe includes a pair of retractable tabs that partially extend through openings within an inverted window balance.

Abstract: The present invention relates to inertial braking system for spring-loaded devices, such as block and tackle window balances incorporated in single and double hung window assemblies. In one embodiment, a block and tackle window balance includes a translatable block assembly disposed in a track including a pawl pivotally attached to the translatable block assembly. The pawl, in response to a rapid acceleration of the translatable block assembly, rotates about a pivot and frictionally engages the track, thereby wedging the translatable block assembly in the track. In another embodiment, the translatable block assembly includes a cam attached to the pawl and a brake shoe disposed between the cam and a cord seated within a pulley. Rotation of the pawl causes the cam to translate the brake shoe, thereby compressing the cord against the pulley.

Abstract: The invention relates to tilt-in window assemblies, in which a sash may be tilted into a room or removed from a window jamb. When the sash is tilted or removed, a balance shoe that is connected to a window balance engages the window jamb and prevents the sash and the window balance from releasing and travelling vertically in the window jamb. The balance shoe is biased into a locked position when a pivot bar coupled to the sash is disengaged from a camming surface of the balance shoe, as occurs when the sash is tilted or removed from the window jamb. Upon return of the sash to its normal vertical position in the window jamb, the pivot bar engages the camming surface and the balance shoe disengages the window jamb.

Abstract: Disclosed are apparatus for a snap lock balance shoe and system to be incorporated in pivotable double hung windows. In one embodiment, the snap lock balance shoe includes a pair of retractable tabs that partially extend through openings within an inverted window balance.

Abstract: A slide block is provided for slideably and pivotally mounting a window sash to a side member of a window frame having a vertical window jamb channel. The slide block includes a body, the body defining a sash pivot-receiving aperture. A sash pivot retainer spring is integrally formed with the body and is positionable between a first position obstructing removal of a sash pivot when the sash pivot is disposed in the aperture and a second position permitting removal of the sash pivot.

Abstract: A locking device for countering the force exerted by a spring balance while a window sash is in a tilt position or removed from a tilt position in a window frame, includes a shoe and a sash pin, the shoe engaging the walls of a jamb or jambliner when the window sash is tilted or removed from a tilt position, and the sash pin having a tab for preventing disengagement from the shoe during installation in a window frame. The shoe includes a pair of arms, one of which terminates in a barb and the other of which terminates in an angled edge, such that upon rotation, the shoe forms a wedge within a jamb or jambliner. The shoe further includes a plurality of prongs disposed between the arms for retaining the sash pin, and a bore for retaining an attachment mechanism associated with a spring balance.

Abstract: A window sash support and movement lock assembly reciprocably disposed within an associated track element. The sash support and movement lock assembly includes a body with a center opening and guide surfaces on each end. A cam unit is received in the center opening and, upon cam rotation caused by tilting of an associated window sash, the guide surfaces are biased apart and into snug engagement with parts of the track element; one part of one of the guide surfaces also carries one or more pins which then engage an end wall of the track unit to provide a secure locking action.