Patent ID: 7849560

Claim:
A window roller apparatus comprising: a cradle having substantially parallel cradle side walls interconnected by a cradle bottom wall, the cradle side walls being formed with opposite inwardly-opening cradle side wall recesses; a housing having substantially parallel housing side walls interconnected by at least one housing intermediate wall, the housing side walls being formed with first and second sets of opposite inwardly-opening housing side wall recesses, the housing side walls being further formed with opposite outwardly-projecting bosses configured to pivotably engage the respective inwardly-opening cradle side wall recesses such that the housing is pivotably installed in the cradle; first and second roller wheels each having first and second axles, the first and second roller wheels being rotatably installed in the housing through engagement of the first and second axles with the respective first and second sets of housing side wall recesses; and a resilient pad positioned on the cradle bottom wall between the cradle and the housing, the pad being of a sufficient size and thickness to at least partially engage the housing, whereby the housing is freely pivotable relative to the cradle within the limitations of at least the pad, the pad effectively biasing the housing toward a parallel orientation relative to the cradle while allowing for non-parallel operation of the housing relative to the cradle as dictated by operational constraints on the window roller apparatus.