EP0803129A1 - Interrupteur mecanique actionne par l'acceleration - Google Patents

Interrupteur mecanique actionne par l'acceleration

Info

Publication number
EP0803129A1
EP0803129A1 EP96900271A EP96900271A EP0803129A1 EP 0803129 A1 EP0803129 A1 EP 0803129A1 EP 96900271 A EP96900271 A EP 96900271A EP 96900271 A EP96900271 A EP 96900271A EP 0803129 A1 EP0803129 A1 EP 0803129A1
Authority
EP
European Patent Office
Prior art keywords
spring tongue
acceleration switch
switch according
contact piece
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96900271A
Other languages
German (de)
English (en)
Other versions
EP0803129B1 (fr
Inventor
Gerhard Mader
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19508014A external-priority patent/DE19508014C1/de
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP0803129A1 publication Critical patent/EP0803129A1/fr
Application granted granted Critical
Publication of EP0803129B1 publication Critical patent/EP0803129B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/14—Switches operated by change of acceleration, e.g. by shock or vibration, inertia switch
    • H01H35/147—Switches operated by change of acceleration, e.g. by shock or vibration, inertia switch the switch being of the reed switch type

Definitions

  • the Ex-invention relates to a mechanical acceleration switch according to the preamble of patent claim 1.
  • Such an acceleration switch (DE-Cl 35 09 054) has a seismic mass arranged on a spring tongue and a contact piece.
  • the electrically conductive spring tongue and the contact piece are guided through the housing and each have an electrical contact at their free ends. Under the action of an acceleration, the spring tongue with the seismic mass is deflected towards the contact piece. If the acceleration is sufficient, an electrically conductive connection is established via the two electrical contacts on the spring tongue and the contact piece.
  • acceleration switch With such an acceleration switch, short switching times can only be achieved at the expense of an unreliable response behavior.
  • the acceleration switch is exposed to vibrations which can cause the spring tongue to vibrate and can thus result in the acceleration switch being closed unintentionally.
  • the switching time is primarily dependent on the distance between the electrical contacts. If this distance is very small, even a small acceleration force, which in particular has a frequency component that is equal to the resonance frequency of the "spring tongue, seismic mass” system, can cause the spring tongue to vibrate with the seismic mass and thus an electrically conductive one Create a connection between the spring tongue and the contact piece. This can result in incorrect triggering of restraint devices of the motor vehicle. Increasing the distance between the spring tongue and the contact piece while simultaneously increasing the elasticity of the spring tongue does not solve this problem, since the increased elasticity of the spring tongue is only more susceptible to vibrations. Experiments have shown that the spring force of the first spring tongue alone is not sufficient to dampen vibrations of the spring tongue.
  • the invention solves this problem with an acceleration switch of the type mentioned at the outset in that the seismic mass is held stationary in its rest position by a force which acts in addition to the spring force.
  • Figure 1 a first embodiment of a mechanical acceleration switch in the stationary state in longitudinal section
  • Figure 2 second embodiment of a mechanical acceleration switch in the stationary state in
  • the acceleration switch 1 ( Figure 1) has a housing 13 which has a spring tongue 11 and a contact piece 12, which is also designed as a spring tongue.
  • a seismic mass 2 is arranged on the spring tongue 11.
  • a pin-shaped molded body 3 is arranged parallel to the spring tongue 11.
  • Spring tongue 11 and contact piece 12 are guided parallel to one another on opposite sides of the housing 13 at different heights through the housing 13. In place of their implementation on the housing 13, the spring tongue 11 and the contact piece 12 are firmly clamped.
  • the spring tongue 11 with the seismic mass 2 can be moved from its stationary rest position to the contact piece 12, so that with a sufficient force transversely to the longitudinal direction of the spring tongue 11 and directed from the spring tongue 11 to the contact piece 12, the free end of the spring tongue 11 Contact piece 12 touched.
  • the spring tongue 11 and seismic mass 2 are sensitive to acceleration forces F in the aforementioned direction due to their inertia.
  • the spring force of the spring tongue 11 counteracts an acceleration force F.
  • the seismic mass 2 is a magnet and forms a magnetic circuit with the shaped body 3 made of a material with high permeability.
  • the shaped body 3 is arranged such that the distance between the shaped body 3 and the seismic mass 2 in the rest position of the spring tongue 11 is minimal.
  • An acceleration force F which is greater than the spring force of the spring tongue 11 plus the magnetic holding force between the seismic mass 2 and the molded body 3 causes the spring tongue 11 to deflect in the direction of the contact piece 12 and establishes an electrically conductive connection.
  • the spring tongue 11 can be additionally biased by the magnetic holding force. The magnetic holding force between the seismic mass 2 and the shaped body 3 prevents the spring tongue 11 from swinging unintentionally.
  • the contact piece 12 is more rigid than the spring tongue 11 in order to prevent the contact piece 12 from swinging.
  • the elasticity of the spring tongue 11 and the magnitude of the magnetic holding force between the seismic mass 2 and the shaped body 3 and the arrangement of the seismic mass 2 along the spring tongue 11 define the acceleration threshold from which the acceleration switch 1 switches.
  • the switching path i.e. the distance between the spring tongue 11 and
  • the seismic mass 2 is arranged along the spring tongue 11 near the area at the free end of the spring tongue 11, which is defined by the contact or the points of contact between the spring tongue 11 and the contact piece 12 in the spring tongue 11 deflected from its rest position. If the seismic mass 2 is made of an electrically conductive material, it can also be arranged at the end of the spring tongue 11.
  • the spring tongue 11 can also be guided through the housing 13 on the same housing side as the contact piece 12.
  • the shaped body 3 in its configuration as a rigid pin can be guided through the housing 13 on the housing side, on which the spring tongue 11 is also guided through the housing 13, as well as on the housing side opposite this housing side.
  • the shaped body 3 in its design device as a rigid pin can also be guided through the housing on both sides of the housing.
  • the molded body 3 can have any other configuration and can be arranged in or on the housing 13.
  • the seismic mass 2 can also be made of a material with high permeability and form a magnetic circuit with a magnet.
  • the magnet can be arranged on the molded body 3, which is now made of any material.
  • the molded body 3 can itself be the magnet.
  • the housing 13 electrically isolates the spring tongue 11 and the contact piece 12.
  • a housing 13 is preferably made of glass, at least in the area where the spring tongue 11 and contact piece 12 pass through.
  • the hermetically sealed housing 13 can be filled with protective gas in order to prevent the spring tongue 11 or the contact piece 12 from corroding.
  • a conventional reed switch with its protective gas-filled glass housing and its two spring tongues is preferably converted into the acceleration switch 1 according to the invention, only a seismic mass being arranged on one of the spring tongues and a molded body being arranged in or on the reed switch housing.
  • the spring tongue 11 can have a local increase in mass as a seismic mass. A local increase in mass on the spring tongue 11 is not necessary if the spring tongue 11 itself has sufficient inertia.
  • the acceleration switch 1 can also be designed as a changeover switch.
  • the spring tongue 11 is electrically conductively connected to a further contact piece in its rest position.
  • the electrically conductive connection between spring tongue 11 and Another contact piece is created by touching the free end of the spring tongue with the further contact piece or by touching the seismic mass 2 with the further contact piece, provided that the seismic mass 2 is made of an electrically conductive material.
  • the molded body 3 in particular in its design as a rigid pin, can also take over the function of the further contact piece, provided that the molded body 3 is made of an electrically conductive material.
  • the statements for the spring tongue 11 and the contact piece 12 apply to the electrical insulation of the further contact piece against the housing 13 and its arrangement in or on the housing 13.
  • the acceleration switch 1 has a housing 13 made of metal, in which a spring tongue 11 with a seismic mass 2 is arranged.
  • a contact piece 12 is electrically insulated through the housing 13 by means of a pressure glass melt 14.
  • the cavity in the interior of the housing 13 is filled with protective gas.
  • the spring tongue 11 is prestressed by a local housing recess 15. The additional spring force caused by the preload prevents the spring tongue 11 from oscillating.
  • acceleration switches 1 are open in the stationary state. They can also be closed in the stationary state and open at an acceleration force that exceeds a defined limit value.
  • the design of the acceleration switch 1 as a changeover switch has the advantage, on the one hand, that assembly states of the acceleration switch 1 can be recognized during the production process, and, on the other hand, that with the delivery of a
  • Signal in the idle state of the acceleration switch 1 is an additional feature for detecting defective switch components. len and a solder break at a connection between a further contact piece, spring tongue 11 and a circuit board carrying an evaluation circuit is recognized.
  • the acceleration switch 1 can be used as a safing sensor in the
  • the acceleration switch 1 is suitable for the detection of a front and rear impact as well as for the detection of a side impact or an impact from any other direction.
  • the acceleration switch 1 has a switching path which is defined as the distance between the spring tongue 11 in its rest position and the contact piece 12, preferably less than 300 ⁇ m or 150 ⁇ m to achieve short switching times.
  • the acceleration switch 1 can be encapsulated with a soft plastic to protect it against mechanical influences and protect an impact after dropping it. With the additional plastic layer, the acceleration switch 1 is also easier to handle in production. It can also be designed as an SMD component.
  • the acceleration switch 1 according to the invention has a small volume and weight, which is of the order of magnitude of a conventional reed switch, in its configuration according to the invention as a protective gas contact in the metal housing underneath.
  • the inventive modification of commercially available components such as of a reed switch or a protective gas contact in the metal housing, manufacturing steps are also reduced.
  • the number of components of the acceleration switch 1 according to the invention is minimized.

Landscapes

  • Switches Operated By Changes In Physical Conditions (AREA)

Abstract

L'invention concerne un interrupteur mécanique actionné par l'accélération, situé dans un boîtier et comportant une lame élastique avec une masse sismique et un contact. Lorsqu'elle est stationnaire, cette lame élastique est en position de repos et peut se dépplacer vers le contact à l'encontre d'une force agissant en plus de la force élastique de la lame, par exemple une force magnétique ou une force produite par la pré-contrainte de la lame élastique. Cet interrupteur mécanique actionné par l'accélération est compact et présente peu de composants ainsi que des temps de commutation brefs. Il permet d'éviter les vibrations de la lame élastique et peut ainsi s'utiliser comme capteur de sécurité pour détecter les collisions latérales.
EP96900271A 1995-01-12 1996-01-12 Interrupteur mecanique actionne par l'acceleration Expired - Lifetime EP0803129B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19500737 1995-01-12
DE19500737 1995-01-12
DE19508014A DE19508014C1 (de) 1995-01-12 1995-03-07 Mechanischer Beschleunigungsschalter
DE19508014 1995-03-07
PCT/DE1996/000035 WO1996021937A1 (fr) 1995-01-12 1996-01-12 Interrupteur mecanique actionne par l'acceleration

Publications (2)

Publication Number Publication Date
EP0803129A1 true EP0803129A1 (fr) 1997-10-29
EP0803129B1 EP0803129B1 (fr) 1998-12-23

Family

ID=26011554

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96900271A Expired - Lifetime EP0803129B1 (fr) 1995-01-12 1996-01-12 Interrupteur mecanique actionne par l'acceleration

Country Status (5)

Country Link
US (1) US5969311A (fr)
EP (1) EP0803129B1 (fr)
JP (1) JPH10512093A (fr)
MX (1) MX9705259A (fr)
WO (1) WO1996021937A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10056656C2 (de) * 2000-11-15 2003-01-09 Little Things Factory Gmbh Mikroschalter mit verstärkter Kontaktkraft
US7170019B2 (en) * 2003-07-14 2007-01-30 Cheerine Development (Hong Kong), Ltd. Inertia switch and flashing light system
US7057354B2 (en) 2003-09-15 2006-06-06 Cheerine Development (Hong Kong) Limited Frequency controlled lighting system
US7067986B2 (en) 2003-09-15 2006-06-27 Cheerine Development (Hong Kong) Limited Frequency controlled lighting system
US7207688B2 (en) 2005-08-18 2007-04-24 Wong Wai Yuen Interactive shoe light device
US20140183021A1 (en) * 2012-12-28 2014-07-03 Yung-Chih Tsai Float switch device with magnetic tongue

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4911511B1 (fr) * 1970-12-11 1974-03-18
US3778572A (en) * 1971-03-25 1973-12-11 Nissan Motor Inertia sensor switch assemblies with magnetic holding means or the like
DE3509054C1 (de) * 1985-03-14 1986-04-24 Daimler-Benz Ag, 7000 Stuttgart Beschleunigungsschalter
US4811153A (en) * 1986-06-25 1989-03-07 Sakatos Michael J Circuit protector
DE3638360A1 (de) * 1986-11-10 1988-05-19 Boge Ag Beschleunigungsmesser
DE3742202A1 (de) * 1987-12-12 1989-06-22 Schmidt Feinmech Beschleunigungssensor
DE3929082A1 (de) * 1988-12-09 1990-06-13 Teves Gmbh Alfred Beschleunigungssensor mit einseitig eingespanntem biegebalken
US5237134A (en) * 1989-12-06 1993-08-17 Breed Automotive Technology, Inc. Gas damped crash sensor
DE4002845C1 (en) * 1990-02-01 1991-06-13 Morgenstern, Bodo, Prof. Dr.-Ing., 2000 Hamburg, De Electromechanical deceleration sensor operated magnetically - has permanent magnet system mounted on leaf spring esp. for safety retention appts. in motor vehicle
DE4007726A1 (de) * 1990-03-10 1991-09-12 Kirsten Elektrotech Beschleunigungsschalter
DE4126107C2 (de) * 1991-08-07 1993-12-16 Bosch Gmbh Robert Beschleunigungssensor und Verfahren zur Herstellung
JP2836777B2 (ja) * 1993-10-15 1998-12-14 ティーアールダブリュ レパ ゲゼルシャフト ミットベシュレンクテル ハフツング 車両乗員拘束装置を起動するための慣性センサ
US5457293A (en) * 1994-05-23 1995-10-10 Automotive Technologies International, Inc. Inertia or gravity responsive tilt switch

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9621937A1 *

Also Published As

Publication number Publication date
JPH10512093A (ja) 1998-11-17
EP0803129B1 (fr) 1998-12-23
US5969311A (en) 1999-10-19
WO1996021937A1 (fr) 1996-07-18
MX9705259A (es) 1997-10-31

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