US Patent 7250571 Stud snap and lock non-metallic snap-on electrical box

An electrical box assembly for nail-free mounting to a stud. The assembly includes an electrical enclosure and a bracket affixed to the enclosure, the bracket defining a stud receiving cavity and a clamping leg. The clamping leg extends into the stud-receiving cavity. The leg is being movable between a first stud-receiving position and a second stud-securing position whereupon insertion of the stud into the cavity moves the clamping leg from the stud-receiving position to the stud-securing position thereby securing the enclosure to the stud.