Jamb liner for flat-sided tilt-type window sash and window assembly

Abstract

A window assembly of the type having at least one sash which is slidably mounted between a pair of jambs defining a window case, wherein the sash includes jamb-engaging side members (i.e., stiles) which have generally flat edges. The flat or flush sides of the sash stiles allow the sash to be easily pivoted away from the plane of the window case, without pushing on, or deforming, the jamb liners, thus overcoming problems generally associated with conventional sash having recess or plows configured to be interfitted with protruding ridge-like channels projecting outwardly from the jambs, as is typically the case with wood-frame windows. In accordance with another aspect of the invention, weatherstrips are mounted to each of the jamb liners to provide weathersealing engagement between the jamb liners and the sash stiles at the sides of the windows. The weatherstrips provide an improved weatherseal as compared with known windows wherein weatherstripping is not provided between the window sash and jamb liner, including windows of the type having stile plows and interfitting jamb ridges. Also, by attaching the weatherstripping to the jambs, as opposed to the sash, the extreme difficulty associated with reliably and cost-effectively anchoring a weatherstrip onto the stiles of a wood-type sash is avoided. Another aspect of the invention provides a spring cover for completely concealing a tension spring used to balance the weight of a vertically movable sash.