Programmable movement analyzer with a plurality of mercury switches
US4899133A · kind A · utility
13Cited by
10References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 8, 1988 |
| Grant date | Feb 6, 1990 |
| Priority date | — |
| Expiry date | Feb 8, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S200/02
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An alert device is provided which initiates an alarm if a person wearing the device ceases normal movement. The device includes a movement sensor having at least one mercury switch which generates a signal when the mercury shifts in response to movement. The device also includes a microcomputer to receive the mercury switch input signals--the microcomputer being programmed to distinguish between inputs indicative of normal wearer movement and inputs which may represent a wearer in duress. Preferably, the motion sensor provides three mercury switches oriented to sense movement in three normal planes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.