Patent ID: 7350334

Claim:
A window regulator assembly, comprising: a shaft having a pinion gear; a counter balance spring mounted on said shaft and disposed to wind or unwind when said shaft rotates; a spring housing mounted on said shaft for covering said spring, said spring housing including an outer surface; a drum having a central bore with a series of internal teeth in driving and meshing engagement with said pinion gear, said drum having cable guides on its exterior periphery for guiding at least one cable wound therearound, said drum including a first axial end face in facing relationship to said outer surface of said spring housing, a rotational axis of said drum being offset with respect to a rotational axis of said pinion gear; a casing for housing said spring, said spring housing and said drum, wherein said casing houses said spring housing and said drum in an abutting relationship with one another; and a rail formed on one of said outer surface of said spring housing and said first axial end face of said drum, said rail extending around said central bore, and a corresponding groove formed in the other of said outer surface of said spring housing and said first axial end face of said drum, said groove disposed radially outward of said central bore and receiving said rail therein for maintaining rotational alignment of said drum relative to said shaft.