US Patent 7257973 Chassis for a lock set

An interconnected chassis includes a mounting plate including a spring engaging tab. A cover plate includes a recessed spring retention wall. A lower cam has a lower pivot axis. An upper cam has an upper pivot axis. A slide plate is positioned between the mounting plate and the cover plate, the slide plate having a spring retention slot and a spring support ledge. The slide plate includes a first end having a pivot feature and a second end having a lower cam engagement member for engaging the lower cam. A spring is positioned in the spring retention slot of the slide plate and in the recessed spring retention wall of the cover plate, and between the spring engaging tab of the mounting plate and the spring support ledge of the slide plate. A toggle is pivotably coupled to the slide plate by the pivot feature, the toggle having a head portion positioned to engage the upper cam.