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1. (WO2001001433) BI-DIRECTIONAL SHOCK SENSOR

Pub. No.:    WO/2001/001433    International Application No.:    PCT/US2000/014254
Publication Date: Fri Jan 05 00:59:59 CET 2001 International Filing Date: Thu May 25 01:59:59 CEST 2000
IPC: H01H 35/14
Applicants: BREED AUTOMOTIVE TECHNOLOGY, INC.
Inventors: BRIERS, Marcel
BENSLEY, Martyn
Title: BI-DIRECTIONAL SHOCK SENSOR
Abstract:
A bi-directional shock sensor (20) has a housing (30) and a reed switch (22) mounted to the housing. The reed switch has a central region (83), and an end (81) on either side of the central region with the reed switch defining an axial direction extending between the two ends. An acceleration-sensing magnet (28) with at least two magnetic poles is positioned adjacent to the central region of the reed switch. A first spring (52) pre-loads the acceleration-sensing magnet in a first direction against a first structure that has portions forming a first stop (50). A second spring (70) pre-loads the first structure against portions of the housing forming a second stop. The second spring biases the first structure in a second direction opposite the first direction. In response to an acceleration in the first direction the acceleration-sensing magnet (28) moves and compresses the first spring (52) and in response to an acceleration in the second direction the acceleration-sensing magnet (28) and the first structure move and compress the second spring (70).