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1. WO1997025624 - MECHANICAL SHOCK SENSOR

Publication Number WO/1997/025624
Publication Date 17.07.1997
International Application No. PCT/US1996/019970
International Filing Date 18.12.1996
Chapter 2 Demand Filed 10.03.1997
IPC
G01P 15/135 2006.01
GPHYSICS
01MEASURING; TESTING
PMEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION OR SHOCK; INDICATING PRESENCE OR ABSENCE OF MOVEMENT;  INDICATING DIRECTION OF MOVEMENT 
15Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
02by making use of inertia forces
08with conversion into electric or magnetic values
135by making use of contacts which are actuated by a movable inertial mass
H01H 35/14 2006.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
35Switches operated by change of a physical condition
14Switches operated by change of acceleration, e.g. by shock or vibration, inertia switch
CPC
G01P 15/135
GPHYSICS
01MEASURING; TESTING
PMEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
15Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
02by making use of inertia forces ; using solid seismic masses
08with conversion into electric or magnetic values
135by making use of contacts which are actuated by a movable inertial mass
H01H 35/147
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
35Switches operated by change of a physical condition
14Switches operated by change of acceleration, e.g. by shock or vibration, inertia switch
147the switch being of the reed switch type
Applicants
  • BREED AUTOMOTIVE TECHNOLOGY, INC. [US]/[US]
Inventors
  • RENEAU, Daniel, R.
Agents
  • DRAYER, Lonnie, R.
Priority Data
587,29212.01.1996US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) MECHANICAL SHOCK SENSOR
(FR) DETECTEUR DE CHOCS MECANIQUE
Abstract
(EN)
A shock sensor (20) has a sensing mass (40, 42) mounted on a metallic reed or spring (32) which, under the influence of a crash-induced acceleration, drives the spring against a contact (48, 58) to close an electrical circuit. The contact end (44) of the spring is twisted to be oriented with respect to the fixed contact at an angle of 60 degrees out of the plane (50) containing the spring. The sensor is oriented such that the acceleration force is approximately normal to the plane containing the spring. The angled contact increases reliability, reduces closure signal noise, and increases contact dwell time. Dwell time can be further enhanced for high shock loads by providing a two stage mass spring system. A second mass/spring combination (140, 164) is arranged so the motion of the second mass (140), after the first reed (132) has made electrical contact, holds the contact closed.
(FR)
Cette invention concerne un détecteur de chocs (20) comportant une masse de détection (40, 42), laquelle est montée sur une tige ou un ressort (32) métallique. Sous l'effet de l'accélération provoquée par une collision, cette masse va pousser le ressort contre un contact (48, 58) afin de fermer un circuit électrique. L'extrémité de contact (44) du ressort est courbée de manière à être orientée selon un angle de 60° par rapport au contact fixe, et à sortir du plan (50) contenant le ressort. Le détecteur est orienté de manière à ce que la force d'accélération soit approximativement perpendiculaire au plan contenant le ressort. Ce contact incliné permet d'accroître la fiabilité, de réduire le bruit du signal de fermeture, et d'allonger le temps de maintien du contact. Ce temps de maintien peut également être accru pour des effets de choc importants à l'aide d'un système de ressort/masse en deux étapes. Dans une autre combinaison de type seconde masse/ressort (140, 164), le déplacement de ladite seconde masse (140) permet de maintenir le circuit fermé une fois le contact électrique établi par la première tige (132).
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