Extended minimum dwell shock sensor
US5212357A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 14, 1991 |
| Grant date | May 18, 1993 |
| Priority date | — |
| Expiry date | Aug 14, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H35/147
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A shock sensor achieving the advantages of extended minimum dwell and extended total dwell employs a reed switch in a housing mounted coaxial to the reed switch. The shock sensor employs a magnet of cylindrical shape, which is coaxial with the reed switch and slidably mounted to activate the reed switch. The shape of the activation magnet, which also serves as an acceleration detecting mass, is that of a cylindrical shell which extends along the axis of the reed switch. The shell has a ring portion extending radially inward and of short axial extent on the end of the magnet which lags in activation. A spring extends between an abutment and the magnet within the shell. When the shock sensor is subjected to an acceleration, the magnet is moved by the acceleration force from a non-activating position. Further extending the activation dwell time of the sensor and, in addition, providing an extended minimum dwell time, is the shape of the magnetic field created by the ring at the first abutting end of the magnet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.