Magnetically biased velocity change sensor

Details Magnetically biased velocity change sensor Magnetically biased velocity change sensor

1989-11-13

1991-11-26

Scott, J. R.

Electricity: circuit makers and breakers

Special application

Change of inclination or of rate of motion responsive

200 6145R, 200 6153, H01H 3514

Patent

active

050685023

ABSTRACT:
A magnetically biased velocity change sensor that is designed for mass-production fabrication and ensuing usage in supplemental inflatable restraint systems of automotive vehicles. The sensor is of the type having a metal sphere that is magnetically biased to one axial end of a tube. When the sensor is subjected to a velocity change of suitable magnitude and duration, the sphere travels to the opposite end of the tube to actuate a switch. Damping of the sphere travel is accomplished by sizing the tube to be of just slightly larger inside diameter than the diameter of the sphere. The invention enhances the manufacturability of the sensor by making dimensioning requirements for the tube and sphere less strict and by enabling different models of sensors to be fabricated from commonly dimensioned tubes and spheres. The invention involves manufacturing the sphere as a sintered iron mass and using a mixture of gases within the tube.

REFERENCES:
patent: 3859645 (1975-01-01), Szeverenyi
patent: 4082927 (1978-04-01), Beckwith
patent: 4329549 (1982-05-01), Breed

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