Impulse sensor

Details Impulse sensor Impulse sensor

1989-09-08

1990-08-14

Scott, J. R.

Electricity: circuit makers and breakers

Special application

Change of inclination or of rate of motion responsive

200 6153, H01H 3514

Patent

active

049489291

ABSTRACT:
A weight of an electrically conductive material is held floating in a magnetic fluid sealed in a case body. A pair of contacts are provided at one end of the case body in a travelling direction of an automobile and protrude into the inside of the case body. Permanent magnets are provided at opposite ends of the case body to apply magnetic fields to the magnetic fluid so that in a normal travelling condition of the automobile, the weight is prevented from reaching the pair of contacts even when the automobile is accelerated or decelerated. However, when an impulsive force exceeding a predetermined level is exerted on the impulse sensor due to collision of the automobile with another automobile or an obstacle, the weight is moved by an inertia force and reaches the pair of contacts to generate a contact signal.

REFERENCES:
patent: 2997557 (1961-08-01), Gillmor et al.
patent: 4043076 (1977-08-01), Potrzuski et al.
patent: 4329549 (1982-05-01), Breed
patent: 4450326 (1984-05-01), Ledger
patent: 4843877 (1989-07-01), Kushida et al.

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