Electronic output circuit for vacuum cleaners

Details Electronic output circuit for vacuum cleaners Electronic output circuit for vacuum cleaners

1978-01-09

1979-08-07

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

15391, H02H 708

Patent

active

041639995

ABSTRACT:
An upright vacuum cleaner having a brush roller rotatably driven by a belt from the cleaner motor and having a safety device for protecting the belt and motor when the brush rotation falls below a predetermined speed. The device includes a magnet in the brush roller, a rotation sensing circuit for generating a pulse for each revolution of the magnet and a motor shut-off circuit controlled by the sensing circuit to shut-off power to the motor when the pulse rate falls below that desired.

REFERENCES:
patent: 2421235 (1947-05-01), Basinger
patent: 4021879 (1977-05-01), Brigham

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