Patent ID: 6701670
Filing Date: 2004-03-09
Classification: E05D,E05Y

Abstract:
A springless sash window system, for a window having a head, comprising:a pair of window sashes, a first and a second pulley apparatus, each of the apparatuses adapted to be mounted in a recess formed in the head, each of the pulley apparatuses comprising one or more pulleys, each of the pulleys rotating about an axle having a horizontal axis, and a first and second sash cord each cord configured to be routed through a respective one of the pulley apparatuses and each cord being attached at multiple locations to each sash of the pair of window sashes at opposing ends of the respective sash cord, so that each of the sashes are counterbalanced with the other sash, without the use of springs, via the first and second sash cords.