Utensil for cleaning floor coverings

Details Utensil for cleaning floor coverings Utensil for cleaning floor coverings

A - Human Necessities

47

L

15/50, 341/91

A47L 9/28 (2006.01) H02P 25/04 (2006.01)

Patent

CA 1147832

ABSTRACT A carpet cleaner has a roller brush driven by a variable speed elec- tric motor and a regulating device is provided which automatically adjusts the motor speed in dependence on the load current drawn by the motor. The regulat- ing device may comprise a thyristor which is connected in the load circuit of the motor. The firing angle of the thyristor is adjusted (in relation to the a.c. single phase supply voltage waveform) in dependence on the voltage develop- ed across a resistor in the load circuit. A cut-off device may be provided to switch-off the motor if the load current drawn exceeds a predetermined maximum value.

364906

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