EP0803129B1 - Mechanischer beschleunigungsschalter - Google Patents

Mechanischer beschleunigungsschalter Download PDF

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Publication number
EP0803129B1
EP0803129B1 EP96900271A EP96900271A EP0803129B1 EP 0803129 B1 EP0803129 B1 EP 0803129B1 EP 96900271 A EP96900271 A EP 96900271A EP 96900271 A EP96900271 A EP 96900271A EP 0803129 B1 EP0803129 B1 EP 0803129B1
Authority
EP
European Patent Office
Prior art keywords
elastic tongue
contact piece
switch according
housing
inertia switch
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.)
Expired - Lifetime
Application number
EP96900271A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0803129A1 (de
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
Original Assignee
Siemens AG
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 filed Critical Siemens AG
Publication of EP0803129A1 publication Critical patent/EP0803129A1/de
Application granted granted Critical
Publication of EP0803129B1 publication Critical patent/EP0803129B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 invention relates to a mechanical acceleration switch according to the preamble of claim 1.
  • Such an acceleration switch (DE-C1 35 09 054) has a seismic mass arranged on a spring tongue and a Contact piece.
  • the electrically conductive spring tongue and that Contact piece are guided through the housing and point to their free ends each have an electrical contact.
  • Under The spring tongue acts with an acceleration seismic mass deflected towards the contact piece. With sufficient Acceleration is via the two electrical ones Contacts on the spring tongue and the contact piece an electrical conductive connection established.
  • acceleration switch With such an acceleration switch there are short switching times only at the expense of unreliable responsiveness realizable.
  • the acceleration switch is in the vehicle Exposed to vibrations that make the spring tongue vibrate can move and thus an unwanted closing of the acceleration switch can result.
  • the object of the invention is an acceleration switch of the type mentioned above to create this disadvantage avoids the known device.
  • the acceleration switch according to the invention has the particular advantage that at small switch dimensions an electrically conductive connection between spring tongue and contact piece due to Vibration of the spring tongue is prevented as long as that on acceleration force acting under the acceleration switch a defined limit.
  • an acceleration switch of the type mentioned as a safing sensor / safety switch for side impact detection used in motor vehicles may between an impact and the triggering of safety devices only pass a very short period of time.
  • the switching time of the accelerometer switch goes in this period of time.
  • the switching time is mainly of the type mentioned Distance between the electrical contacts depends. Is this distance is very small, even a small acceleration force, which in particular has a frequency component, which is equal to the resonant frequency of the system "spring tongue, seismic mass "is the spring tongue with the seismic Excite mass to vibrate and thus an electrically conductive Connection between the spring tongue and the contact piece cause.
  • a false triggering of the restraint systems of the Motor vehicle can be the result.
  • the invention solves this problem with an acceleration switch of the type mentioned in that the seismic Mass stationary due to an addition to the spring force acting force is held in its rest position, and a distance between the spring tongue in its rest position and the contact piece from is less than 300 ⁇ m.
  • the acceleration switch 1 (FIG. 1) has a housing 13, which has a spring tongue 11 and a contact piece 12, the is also designed as a spring tongue. On the spring tongue 11 a seismic mass 2 is arranged. Parallel to the spring tongue 11, a pin-shaped molded body 3 is arranged.
  • Spring tongue 11 and contact piece 12 are parallel to each other on opposite sides of the housing 13 on different Height passed through the housing 13. At the point their implementation on the housing 13 are the spring tongue 11 and the contact piece 12 clamped firmly.
  • the spring tongue 11 with the seismic mass 2 is from its stationary rest position movable to the contact piece 12 so that with a sufficient Force transverse 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 touches the contact piece 12.
  • the seismic mass 2 is a magnet and forms with it Shaped body 3 made of a material with high permeability Magnetic circuit.
  • the molded body 3 is arranged so that the distance between shaped body 3 and 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 seismic Mass 2 and molded body 3 causes a deflection of the Spring tongue 11 in the direction of contact piece 12 and provides one electrically conductive connection.
  • the spring tongue 11 can be additionally biased. The magnetic holding force between the seismic Mass 2 and the molded body 3 avoids an unwanted Swinging of the spring tongue 11.
  • the contact piece 12 is more rigid than the spring tongue 11, in order to avoid swinging of the contact piece 12 in turn.
  • the elasticity of the spring tongue 11 and the size of the magnetic Holding force between seismic mass 2 and shaped body 3 and the arrangement of the seismic mass 2 lengthways
  • the spring tongue 11 defines the acceleration threshold which switches the acceleration switch 1.
  • the switching path i.e. the distance between the spring tongue 11 and Contact piece 12 is in the sense of a short closing time of the acceleration switch 1 small.
  • the seismic mass is 2 along the spring tongue 11 near the area at the free end of the Spring tongue 11 arranged by the touch or the Points of contact between the spring tongue 11 and the contact piece 12 in the spring tongue deflected from its rest position 11 is set. Is the seismic mass 2 from an electrical made of conductive material, it can also end the spring tongue 11 may be arranged.
  • the spring tongue 11 can also on the same housing side as the contact piece 12 are guided through the housing 13.
  • Shaped body 3 in its design as a rigid pin can be guided both through the housing 13 on the housing side on which the spring tongue 11 through the housing 13th is performed, as well as on the opposite side of this housing Housing side.
  • the shaped body 3 in its design as a rigid pin can also be used on both sides of the housing be passed through the housing.
  • the molded body 3 can have any other configuration and in or on the housing 13 be arranged.
  • the seismic mass 2 can also be made of a material with high Permeability should be established and with a magnet Form a magnetic circuit.
  • the magnet can be arranged on the molded body 3 be made of any material is.
  • the molded body 3 can itself be the magnet be.
  • the acceleration switch 1 insulates the housing 13, the spring tongue 11 and that Contact piece 12 electrical.
  • a housing 13 is preferred made of glass, at least in the area of Implementation of spring tongue 11 and contact piece 12.
  • the hermetic tight housing 13 can be filled with protective gas, to corrode the spring tongue 11 or the contact piece 12 to prevent.
  • a conventional reed switch is preferably used with its Inert gas-filled glass housing and its two spring tongues redesigned to the acceleration switch 1 according to the invention, only a seismic mass on one of the spring tongues and a molded body in or on the reed switch housing is arranged.
  • the spring tongue 11 can have a local mass increase as a seismic Have mass. A local increase in mass on the spring tongue 11 is not applicable if the spring tongue 11 itself has sufficient inertia.
  • the acceleration switch 1 can also be designed as a changeover switch will.
  • the spring tongue 11 is in its rest position electrically conductively connected to another contact piece.
  • 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 the seismic mass 2 is made of electrically conductive material.
  • the molded body 3 in particular in its design as a rigid pin, the function of the further contact piece if the molded body 3 is made of electrical conductive material is made.
  • the further contact piece against the housing 13 and its arrangement in or on the housing 13 applies to the statements for the spring tongue 11 and the contact piece 12.
  • the acceleration switch 1 a housing 13 made of metal, in which a Spring tongue 11 is arranged with a seismic mass 2.
  • a contact piece 12 is by means of a pressure glass melting 14 electrically insulated through the housing 13. Of the Cavity inside the housing 13 is filled with protective gas.
  • the spring tongue 11 is formed by a local housing recess 15 biased. The additional one caused by the preload Spring force prevents the spring tongue 11 from oscillating.
  • acceleration switches 1 are open in the stationary state. You can in the stationary State should also be closed and with an acceleration force, that exceeds a defined limit, to open.
  • the design of the acceleration switch 1 as a switch on the one hand has the advantage that during the manufacturing process Equipped states of the acceleration switch 1 detected secondly, that with the delivery of a Signal in the idle state of the acceleration switch 1 an additional Feature for recognizing defective switch components and a solder joint break on a connection between further contact piece, spring tongue 11 and an evaluation circuit supporting board is recognized.
  • the acceleration switch 1 can be used as a safing sensor in the Motor vehicle for impact detection and control of safety devices be used.
  • the invention Acceleration switch 1 is suitable for detection a front and rear impact as well as for detection a side impact or an impact from everyone other direction.
  • the acceleration switch 1 points as a safing sensor for side impact detection the acceleration switch 1 has a switching path that is called a distance between the spring tongue 11 in its rest position and the Contact piece 12 is defined, preferably less than 300 ⁇ m, or 150 ⁇ m to achieve short switching times.
  • the switching path determines the spring force of the spring tongue 11 and the one acting on the spring tongue 11 and seismic mass 2 Acceleration force the closing time of the acceleration switch.
  • the closing time from the deflection of the spring tongue 11 from their rest position until the contacts between Spring tongue 11 and contact piece 12 is measured, may be about 3 Do not exceed milliseconds because of a side airbag system in the event of an impact, approximately 5 milliseconds from the start of the impact must have triggered and elapse about 2 milliseconds, until the acceleration reaches the threshold, from which the spring tongue of the accelerator switch its rest position leaves.
  • the switching time is less than 3 milliseconds.
  • An extreme short switching distance means a short switching time the crucial parameter.
  • the acceleration switch 1 can be made with a soft plastic overmolded to protect it against mechanical influences and protect an impact after dropping it. With the additional plastic layer is the acceleration switch 1 also easier to handle in production. He can also be designed as an SMD component.
  • the acceleration switch according to the invention 1 a small volume and weight that in is on the order of a conventional reed switch, in its inventive design as a protective gas contact in the metal case far below.
  • Modification of commercially available components such as a reed switch or a protective gas contact in a metal housing, manufacturing steps are also reduced.
  • the number of components of the acceleration switch according to the invention 1 is minimized.

Landscapes

  • Switches Operated By Changes In Physical Conditions (AREA)
EP96900271A 1995-01-12 1996-01-12 Mechanischer beschleunigungsschalter Expired - Lifetime EP0803129B1 (de)

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 (de) 1995-01-12 1996-01-12 Mechanischer beschleunigungsschalter

Publications (2)

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

Family

ID=26011554

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96900271A Expired - Lifetime EP0803129B1 (de) 1995-01-12 1996-01-12 Mechanischer beschleunigungsschalter

Country Status (5)

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

Families Citing this family (3)

* 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
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 (es) * 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

Also Published As

Publication number Publication date
MX9705259A (es) 1997-10-31
EP0803129A1 (de) 1997-10-29
JPH10512093A (ja) 1998-11-17
WO1996021937A1 (de) 1996-07-18
US5969311A (en) 1999-10-19

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