Block and Tackle Window Balance with Bottom Guide Roller

A block and tackle window balance device comprising:

• a channel comprising a first end and a second end;
• a top guide connected to the first end of the channel;
• a bottom guide connected to the second end of the channel;
• a bottom guide roller rotatably mounted to the bottom guide;
• a fixed pulley block unit connected to the channel;
• a translatable pulley block unit moveable within the channel;
• a spring comprising a first end and a second end, wherein the first end is fixed relative to the channel and the second end is connected to the translatable pulley block unit;
• and
• a cord comprising a first cord end and a second cord end, wherein the cord is threaded through the translatable pulley block unit and the fixed pulley block unit and extends around the bottom guide roller, the first cord end being attached to the translatable pulley block unit and the second cord end being attachable to a jamb.