(under subclass 250.001) Cleaning attachments comprising a common drive for two or more surface contacting members movable over different areas of the surface to be cleaned and wherein the cleaning stroke of one member is not in phase with the cleaning stroke of the other.
(1) Note. The cleaning stroke of plural cleaning members are not in phase if (1) the angular velocity of one is different than the angular velocity of another or (2) if one member is at an end of its stroke at a time when another member is not at the end of its stroke.
(2) Note. Cleaning members which have identical but allochiral motion are considered to be in phase.
