Abstract: In sash windows where the sashes are supported on window units which run in channels in a window frame, and the window units are suspended from spring balances, the shoes have easily accessible mechanisms for adjusting the tension in the spring balances, without demounting the sashes and without separating the spring balances from the shoes. Adjustment is done by rotating an element in the shoes, at the bottom of the sash, with the sash pivoted out of the plane of the window. A tool is inserted in a socket to turn an element of the shoe exposed by the tilting of the sash, and the rotation of this element is transferred through 90° to vary the tension in the respective balance.

Abstract: In sash windows where the sashes are supported on window units which run in channels in a window frame, and the window units are suspended from spring balances, the shoes have easily accessible mechanisms for adjusting the tension in the spring balances, without demounting the sashes and without separating the spring balances from the shoes. Adjustment is done by rotating an element in the shoes, at the bottom of the sash, with the sash pivoted out of the plane of the window. A tool is inserted in a socket to turn an element of the shoe exposed by the tilting of the sash, and the rotation of this element is transferred through 90° to vary the tension in the respective balance.

Abstract: A sash window can be adapted for motorised operation using a rack and pinion drive. A preassembled motor unit (24) with a drive pinion (34) is mounted within one window stile (16). A rack (38) engages with the pinion and slides in a track (66) in the window stile. The window sash (14) which is to be driven up or down is connected to the rack through upper and lower hook mountings (48, 50), and the opposite side of the sash is free to travel between vertical guide surfaces.