Patent ID: 9309709
Filing Date: 2016-04-12
CPC Classification: E05D

Claim Text:
1. A counterbalance assembly for a tilt-in window having a pivot bar, the counter balance assembly and the tilt-in window installed in a window jamb having a jamb channel, the counter balance assembly 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 slot, a cam having a rotational axis and rotatably engaging the aperture, and a first projection, the vertically extending first slot configured to receive the pivot bar of the tilt-in window via a vertical drop-in installation, the cam being rotatable within the aperture between a locked position and an unlocked position, the cam having a second slot that is aligned with the vertically extending first slot when the cam is in the locked position allowing the pivot bar to move between the vertically extending first slot and the second slot of the cam, the first projection extending into the vertically extending first slot and intersecting a vertical centerline of the aperture, the first projection directly engaging the second portion of the first spring.