Patent ID: 8966822
Filing Date: 2015-03-03
Classification: E05C,E05D,E06B,Y10T

Abstract:
1. A window balance assembly for installation within a jamb channel of a window jamb in a hung window, the jamb channel having a width and a depth, the window balance assembly comprising: a carrier assembly configured to engage a window sash and housing a curl spring; a mounting bracket fixed to the window jamb, positioned vertically above the carrier assembly and configured to engage an uncurled end of the curl spring; and an air dam having a generally rectangular prism geometry, having a first dimension corresponding to the width of the jamb channel and having at least a portion of a second dimension corresponding to the depth of the jamb channel; a debris dam having a generally rectangular prism geometry; wherein the air dam is positioned within the jamb channel between the carrier assembly and the mounting bracket; wherein the air dam is independently movable along an uncurled portion of the curl spring between the carrier assembly and the mounting assembly; wherein the air dam has a first opening to enable the uncurled end of the curl spring to pass through the air dam; and wherein the debris dam has a second opening to enable the uncurled end of the curl spring to pass through the debris dam.