Abstract: A window regulator for operating a window pane includes an attachment channel configured for attachment to the window pane, a regulator base plate, a pair of sector gears, and a drive motor. Each sector gear includes a plurality of external gear teeth, and a lift arm slidingly coupled to the attachment channel. The sector gears are rotatably coupled to the base plate and are disposed such that the gear teeth of one of the sector gears directly engage the gear teeth of the other sector gears. The drive motor is in direct engagement with one of the sector gears. Consequently, rotation of the drive pinion of the drive motor causes the sector gears to rotate in opposing directions and the lift arms to either raise or lower the window pane.

Abstract: A window regulator system has a first rail and a second rail. The second rail is spaced in a parallel relation with the first rail. A first slider assembly slidably engages the first rail and a second slider assembly slidably engages the second rail. A first cable engages the first slider and has opposite ends thereof wound about a first drum assembly. The first cable is guidedly mounted on the first rail. A second cable engages the second slider and has opposite ends thereof wound about a second drum assembly. The second cable is guidedly mounted on the second rail. A drive system simultaneously rotates the first and second drum assemblies. Rotating the first and second drum assemblies effects parallel movement of the first and second sliders. When a window is mounted on the sliders, the window regulator system effects opening and closing thereof.