Inertia-sensitive device

Details Inertia-sensitive device Inertia-sensitive device

1986-03-20

1988-02-09

Chapman, John

Measuring and testing

Vibration

Sensing apparatus

340566, 340689, G01H 1108, G08B 1300

Patent

active

047234474

ABSTRACT:
An inertia-sensitive device for detecting movement of, or impact on, the device or vibrations in its vicinity comprises a housing having a flat or concave surface, a ball freely supported within the housing upon that surface, the ball and/or the surface having an uneven texture, and a piezoelectric detector in direct or indirect contact with said housing. In one form of the device, which is illustrated, the surface is roughened and extends to a full spherical surface and the ball is of steel.

REFERENCES:
patent: 3631271 (1971-12-01), Shimada
patent: 4656458 (1987-04-01), Iwata

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