Patent ID: 8042227

Claim:
A block and tackle window balance device adapted for traveling with a window sash, the block and tackle window balance device comprising: a channel comprising a first end and a second end; a top guide in contact with the first end of the channel; a bottom guide in contact with the second end of the channel; a fixed pulley unit coupled to the second end of the channel; a translatable pulley unit disposed within the channel; a spring comprising a first end and a second end, wherein the first end of the spring is fixed relative to the channel and the second end of the spring is connected to the translatable pulley unit; a cord comprising a first cord end and a second cord end, wherein portions of the cord contact the fixed pulley unit and the translatable pulley unit, and wherein the first cord end is coupled to the translatable pulley unit; and a roller for dispensing the cord proximate the second end of the channel, wherein at least a portion of the roller is disposed below the second end of the channel.