(under subclass 250.001) Cleaners comprising a movable surface contacting member, a motor drive therefor and (1) means for maintaining the speed of the member constant during fluctuations of the driving motor power source, or during fluctuations in the speed of the driving motor, or (2) automatic means for controlling the motor speed.
(1) Note. To Be "automatic" the cleaner must comprise a cleaning element and a means for sensing a condition or
change of condition, which condition or change of condition may or may not occur, a separate control means and a separate power means for changing a condition of operation of the cleaner, said three means being so related that the sensing means controls operation of the controlling means and the control means controls operation of the power means, all without the intervention of a human operator.
