The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 20, 1981
Filed:
Jan. 08, 1979
Daniel A Baker, St. Joseph, MI (US);
Whirlpool Corporation, Benton Harbor, MI (US);
Abstract
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 discontinuation 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 discontinuation of 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.