Quick-response accelerometer with increased contact dwell time

Details Quick-response accelerometer with increased contact dwell time Quick-response accelerometer with increased contact dwell time

1992-09-22

1994-11-29

Pellinen, A. D.

Electricity: circuit makers and breakers

Special application

Change of inclination or of rate of motion responsive

200 6153, G01P 15135, H01H 3514

Patent

active

053692314

ABSTRACT:
An acceleration sensor comprises a tube formed of an electrically-conductive, nonmagnetic material; an annular magnetically-permeable element, such as a iron washer, encircling a longitudinal portion of the tube; a magnetic sensing mass in the tube which magnetically interacts with the washer so as to be magnetically biased towards a first or "rest" position in the tube characterized in that a longitudinal portion of the sensing mass is situated within the portion of the tube encircled by the washer, the sensing mass being displaced from its rest position in the tube towards a second position therein in response to an accelerating force exceeding the magnetic bias thereon; and a switch operated by the sensing mass when the sensing mass is displaced to its second position in the tube. The instant accelerometer features a low threshold magnetic bias of the sensing mass of perhaps a fraction of 1 g to provide a quickened sensing mass response to acceleration inputs of short duration; whereafter the magnetic bias increases so as to peak when the sensing mass is displaced to a position within the passage intermediate its first and second positions therein, and thereafter decreases to a value equal to or slightly greater than 0.8 gs to maximize switch contact dwell time.

REFERENCES:
patent: 4933515 (1990-06-01), Behr et al.
patent: 5149925 (1992-09-01), Behr et al.

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