Gas damped crash sensor

Details Gas damped crash sensor Gas damped crash sensor

1989-02-21

1990-02-13

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

049008803

ABSTRACT:
Conventional ball-in-tube, gas-damped, crash sensors utilize a gold plated ball to bridge two contacts. When the ball senses acceleration (deceleration) in the longitudinal direction of a cylinder of sufficient magnitude and duration, it moves to where it bridges the contacts, completing the electrical circuit and initiating deployment of a safety restraint system. The contact duration of this type of sensor is significantly affected by bouncing of the contacts after being hit by the sensing mass and by the accelerations in directions perpendicular to the axis of the tube. This sometimes results in no triggering, or late triggering, of the sensor. A switch activated by magnetic flux is combined with this type of gas-damped sensor to provide a solid and reliable contact duration and ensure the correct functioning of the sensor. The level of biasing force for crash zone crash sensors of this type has been increased to avoid late firing problems on marginal crashes.

REFERENCES:
patent: 2997557 (1961-08-01), Gillmor et al.
patent: 3515827 (1970-06-01), Beeken
patent: 3737599 (1973-06-01), Zuvela
patent: 4329549 (1982-05-01), Breed
patent: 4484041 (1984-11-01), Andres

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