| 摘要 |
A window sash balancer is provided for use with slide-out sash windows, double-hung sash windows or the like. The balancer includes a housing, a shaft rotatably supported in the housing and having one end projecting beyond the housing, and a spring disposed within the housing and having one end secured to the housing and the other end to the shaft. The spring normally biases the shaft in one direction of rotation. The shaft has at its projecting end a drum of a frustoconical shape around which there is wound a wire member. A cord is provided in and along a spiral groove defined by adjacent turns of the wound wire member and has one end secured to the drum, the other end being adapted to be connected to a window sash. |
