Magnetic accelerometer

Details Magnetic accelerometer Magnetic accelerometer

1999-04-05

2000-07-11

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

32420725, 200 6145M, 200 6146, 200 6153, 73 138, 73 182, 73 186, 7351431, G08B 2100

Patent

active

060879513

ABSTRACT:
A magnetic accelerometer detects the sharp lateral rocking movements of an unbalanced spinning tub of a washing machine. The accelerometer has a fixed and a movable magnet that are disposed at a rest position in spaced, magnetic attraction to each other. The movable magnet breaks away from the stationary magnet in response to vibration forces of a predetermined magnitude and frequency. When the magnet breaks away, it presses against an actuator button of a miniature switch and therefore signals an alarm condition. When the vibration forces are reduced below the trigger level, the movable magnet is pulled back to its rest position by magnetic attraction with the stationary magnet. The magnetic attraction of the stationary and movable magnets can be adjusted and the break away point can be set by applying an external magnetic field to the magnets.

REFERENCES:
patent: 4222250 (1980-09-01), Torita
patent: 4933515 (1990-06-01), Behr et al.
patent: 5159823 (1992-11-01), Fukada et al.
patent: 5283405 (1994-02-01), Green
patent: 5444531 (1995-08-01), Foreman et al.
patent: 5673021 (1997-09-01), Woods
patent: 5753872 (1998-05-01), Komiya et al.
patent: 5841356 (1998-11-01), Woodruff et al.
D4 Series, Miniature, pp. 3-6 thru 3-11.

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