Window counterbalance system

A window counterbalance system for a tilt-in window having a pivot bar, the window counterbalance system and the tilt-in window installed in a window jamb, the window counterbalance system comprising:

• a bracket fixedly mounted to the jamb channel;
• a first spring having a first portion and a second portion, the first portion of the the first spring coupled to the bracket;
• and
• a carrier assembly having a vertically first extending slot, an aperture in communication with the vertically extending slot, a cam having a rotational axis and rotatably engaging the aperture, a first projection, extending inwardly toward a centerline of the vertically extending first slot, and a second projection, extending inwardly toward the centerline of the vertically extending slot the vertically extending first slot adapted to receive the pivot bar of the tilt-in window via a vertical drop-in installation, the cam configured to rotate within the aperture between a locked position and an unlocked position, the cam having a second slot in communication with the vertically extending first slot when the cam is in the locked position to allow the pivot bar to move between the vertically extending slot and the second slot of the cam, the first projection having a first distal end and the second projection having a second distal end, the first and the second distal ends facing one another and defining a gap therebetween, the gap being vertically aligned with a vertical centerline of the aperture and in communication with the vertically extending first slot, and wherein one of first projection and the second projection directly engages the second portion of the spring.

A window counterbalance system for a tilt-in window having a pivot bar, the window counterbalance system and the tilt-in window installed in a window jamb, the window counterbalance system comprising:

• a bracket fixedly mounted to the jamb channel;
• a first spring having a first portion and a second portion, the first portion of the first spring coupled to the bracket;
• and
• a carrier assembly having a vertically extending first slot, an aperture in communication with the vertically extending first slot, a cam having a rotational axis and rotatably engaging the aperture, and a projection, the vertically extending first slot adapted to receive the pivot bar of the tilt-in window via a vertical drop-in installation, the cam configured to rotate within the aperture between a locked position and an unlocked position, the cam having a second slot in communication with the vertically extending first slot when the cam is in the locked position to allow the pivot bar to move between the vertically extending first slot and the second slot of the cam, the projection extending into a first portion of the vertically extending first slot, the first portion having a longitudinal axis that is offset from a longitudinal axis of the second slot when the cam is in the locked position, the vertically extending first slot including a second portion vertically aligned with and directly adjacent the second slot when the cam is in the locked position and a third portion that connects the first and second portions and that is disposed at an angle relative to the longitudinal axis of the second slot when the cam is in the locked position wherein the longitudinal axis of the second slot of the cam is substantially collinear with a vertical centerline of the second portion of the vertically extending first slot and is substantially parallel with and offset from vertical centerline of the first portion of the vertically extending slot when the cam is in the locked position.