A - Human Necessities – 47 – L
Patent
A - Human Necessities
47
L
342/16
A47L 9/00 (2006.01) A47L 9/28 (2006.01) H02H 7/093 (2006.01)
Patent
CA 1121032
"CONTROL CIRCUIT FOR PROTECTING VACUUM CLEANER MOTOR FROM JAMMED BEATER BRUSH DAMAGE" ABSTRACT OF THE DISCLOSURE A control circuit for effectively preventing damage to the blower or fan motor of a vacuum cleaner which could otherwise result from a jammed condition of the beater brush thereof. The control circuit effects discontinuation of the energization of the motor in the event the rotational speed of the beater brush drops below a preselected speed. The dis- continuation of energization may be effected by the control a preselected period of time after the speed drops below the preselected speed. An indicating device may be provided for indicating such discontinuation of energization. A second indicating device may be provided for indicating a reduction in speed of the beater brush less than that sufficient to cause discontinuation of the energization but sufficient to warrant warning the user that a partial jamming of the beater brush has occurred. The control may be arranged to require manual operation of the operating switch of the vacuum cleaner to the "off" condition and subsequently to the "on" condition to re-energize the motor subsequent to such discontinuation of energization. The control includes means for causing the energization of the motor in the event the motor does not come up to a preselected speed within a preselected period of time after such operation of the control switch to the "on" position. The speed of the beater brush may be sensed by a Hall effect sensor responding to magnetic pulses from a magnet rotatable with the beater brush.
340637
Baker Daniel A.
Corporation Whirlpool
Kirby Eades Gale Baker
LandOfFree
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