Inertia-sensitive device
US4723447A · kind A · utility
5Cited by
2References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 20, 1986 |
| Grant date | Feb 9, 1988 |
| Priority date | — |
| Expiry date | Mar 20, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/02
- WIPO fieldControl
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.