EP0125493B1 - Acceleration value limiting switch - Google Patents

Acceleration value limiting switch Download PDF

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Publication number
EP0125493B1
EP0125493B1 EP84104009A EP84104009A EP0125493B1 EP 0125493 B1 EP0125493 B1 EP 0125493B1 EP 84104009 A EP84104009 A EP 84104009A EP 84104009 A EP84104009 A EP 84104009A EP 0125493 B1 EP0125493 B1 EP 0125493B1
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EP
European Patent Office
Prior art keywords
limit switch
acceleration limit
contact
inertia member
acceleration
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
Application number
EP84104009A
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German (de)
French (fr)
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EP0125493A1 (en
Inventor
Heino Burmester
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.)
Helba Elektronik-Baugruppen & Co KG GmbH
Original Assignee
Helba Elektronik-Baugruppen & Co KG GmbH
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Filing date
Publication date
Priority claimed from DE3313033A external-priority patent/DE3313033C1/en
Application filed by Helba Elektronik-Baugruppen & Co KG GmbH filed Critical Helba Elektronik-Baugruppen & Co KG GmbH
Publication of EP0125493A1 publication Critical patent/EP0125493A1/en
Application granted granted Critical
Publication of EP0125493B1 publication Critical patent/EP0125493B1/en
Expired legal-status Critical Current

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    • 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

Definitions

  • the invention relates to an acceleration limit switch with a spherical inertial body made of ferromagnetic material, which is held in the rest position by a magnet system and which are opposed by two mutually insulated contact elements which can be contacted by elastic deformation of a membrane when the inertial body strikes.
  • an acceleration limit switch which consists essentially of a permanent magnet, a ferromagnetic ball held by this, a circuit board with chamber-like interlocking contact fingers and an elastic, conductive membrane, which is arranged between the ball and the circuit board . If an acceleration above the limit value occurs, the ball tears off the magnet and, due to its inertia, flies against the membrane so that it briefly touches the circuit board while making contact.
  • the conductive or equipped with a conductive area membrane must be held by the special design of a two-part housing.
  • the circuit board is held in the housing cover by contact pins.
  • an electrical inertia switch which consists of an electromagnet and a ferromagnetic ball. At rest, the ball is held in a shallow depression in which it makes contact between two elements which are isolated from one another. In the event of excitation, the ball releases from its rest position by opening the contact.
  • the invention is therefore based on the object of expanding the controllability of the limit switch even more, in order to electronically evaluate successive contact closings for controlling restraint devices, warning systems or for accident analysis, and to secure the contact surfaces against corrosion with little effort.
  • Fig. 6, 1 denotes a cuboid or cylindrical housing which has a funnel-shaped recess 1a in the upper part.
  • a ferromagnetic ball 2, which is held by an electromagnet 7, 8, is mounted in this recess.
  • the preferably cylindrical and axially polarized electromagnet 7, 8 is fastened in a bottom opening of the plastic housing.
  • a thermoplastic is preferably used, which locks the electromagnet 7, 8 by deforming the edge 1b.
  • the bottom of the funnel-shaped recess 1 is designed as a spherical cap, so that the ball 2 is separated from the electromagnet 7, 8 by a certain wall thickness, which acts as a magnetic air gap.
  • the ball 2 is held in its rest position only by the inhomogeneity of the stray magnetic field.
  • the mechanical part of the switch thus consists only of an electromagnet, ball and housing. With 9, 10, 11, 12 pressed-in metal pins are designated, which are used for alternative fastening on a circuit board.
  • the electrical part of the switch is formed by a partially metallized double film 4, which is protected by the cover 5.
  • the cover 5, which is preferably designed as an insulating stamped part, has, like the double film 4, openings, through which molded rivets 1c, 1 d, consisting of the material of the housing, protrude. These rivets are thermally or ultrasonically deformed when the switch is installed.
  • FIGS. 1-4. 1 shows a circular plastic film 4a with a lateral connecting lug 4a1 and a contact mat 4a2.
  • a circular ring 4b is shown, which consists of double-sided adhesive plastic film.
  • the film is designated 4c, which carries a lateral connecting lug 4c1 and a contact mat 4c2.
  • An air-filled cavity 6 is formed between the parts 4a and 4c and is completely sealed off from the outside air by the ring 4b.
  • the metal layers face each other at a distance of a few tenths of a millimeter, so that there is a sufficient insulation gap.
  • the lower film is elastically deformed to such an extent that the contact is briefly closed.
  • the parts 4a, 4b and 4c are shown without rivet holes. Their diameter can also be smaller than the rivet hole circle.
  • the deformation characteristic of the film is chosen so that only the weight of the ball does not lead to contact. This prevents the switch from making permanent contact when the vehicle is on the roof, which e.g. could permanently lock the belt buckle.
  • the ball 2 in its bearing is completely sealed from the outside space by the foils 4a, 4b and 4c and the cover 5 and is not involved in the electrical contacting with its metal surface, its surface does not require a noble metal layer.
  • the contact mat 4a2 can be applied directly to the cover 5 so that it is designed as a circuit board.
  • Fig. 5 shows the complete switch in perspective.
  • the housing 1 consists of a cuboid that merges into a half cylinder. This means that at least one flat surface is available in all three coordinate directions for mounting on a printed circuit board or a housing.
  • the contact system 4 has the shape of a rectangle with an adjoining semicircular surface.
  • the design according to FIG. 6 shows that the lower part of the housing 1 carries a coil 7 and a soft iron core 8.
  • the coil 7 is connected to the vehicle electrical system when the ignition of the motor vehicle is switched on.
  • the tripping or limit value of the switch can then be easily adjusted in the factory using a series resistor.
  • 21 denotes a preferably cylindrical plastic housing, which encloses a cavity 21 a which is symmetrical and funnel-like or truncated cone-like to the axis CD.
  • a ferromagnetic, spherical inertial body 22 is mounted in this cavity.
  • a cylindrical ferromagnetic core 23, which is surrounded by a magnetic coil 24, is arranged under the inertial body 22.
  • a pot-like ferromagnetic yoke 25 is pushed over the coil 24 and can be varied to set the acceleration limit value for a specific magnetizing current.
  • Core 23 and yoke 25 are permanently connected by a molded rivet 23a formed from the core material.
  • the yoke 25 also provides mechanical protection for the coil 24.
  • the cavity 21 a is closed at the top by a rubber-elastic membrane 26 with a conductive central zone 26 a and a printed circuit board 27.
  • the printed circuit board 27 has two connecting pins 27a and 27b, which are connected to conductor structures which intermesh in a comb-like manner.
  • the membrane 26 is reinforced in the edge zone 26b, so that the conductive central zone does not touch the circuit board in the idle state.
  • Diaphragm 26 and printed circuit board 27 are captively and sealingly connected to housing 21 by the “flanged” collar 21 h. If a thermoplastic housing material is used, the edge zone 21 h can be deformed using ultrasound.
  • the membrane 26 is preferably so rigid in its spring characteristic that no contact is triggered by the weight of the inertial body 22 alone. If the vehicle slides over the road after a primary impact on the side or the roof, you get a series of evaluable secondary impulses, but not in the rest position a permanent contact.
  • the housing 21 has two bores 21c, 21d lying on an optical axis. Transmitters 28 and receivers 29 of a light barrier are inserted into these bores, the optical axis of which intersects the spherical inertial body 22 in its rest position.
  • the frustoconical cavity 21 a preferably merges into a spherical cap 21 b.
  • the holes 21 c, 21 d can break through the region of the spherical cap 21 b in order to be in the used visible or infrared light to avoid reflection losses.
  • the bores 21 c, 21 d at the transition to the calotte 21 b can be closed with molded optical windows.
  • the cylindrical light-emitting diodes and receiver diodes, which are available in very small dimensions, are sealed in the holes by casting resin drops or permanently plastic putty.
  • the lead wires led out are designated 28a, 29a.
  • prism-like ribs 21e, 21f, 21g are incorporated into the conical jacket, which prevent the inertial body 22 from spinning or at least slow it down. A similar effect could be achieved through appropriate deepening.
  • the entire acceleration limit switch can be attached to a larger circuit board by means of the connecting pins 27a, 27b.
  • the connecting wires 28a, 29a are then also to be soldered to this circuit board.
  • FIG. 8 shows the cross section of the housing 21 and the inertial body 22 and the top view of the inference 25.
  • the transmitter 28 and receiver 29 are inserted into the bores 21 c, 21 d.
  • the optical axis is indicated by the line EF.
  • the position of use of the switch corresponds to the representation in which the axis of symmetry CD coincides with the vertical, ie the direction of gravity.
  • the response value is the same for all acceleration directions perpendicular to the axis CD. In other words, it has no influence on the response value whether the vehicle equipped with the switch is pushed from the front, from the rear or from the side. In the case of impacts in the direction of the CD axis, however, the sensitivity is considerably greater.
  • the switch described has two independent contact systems. If the magnetic holding force which can be set via the coil 24 is exceeded, the body 22 tears off, so that the barrier 28, 29 responds after a very short travel distance. At the end of the taxiway or flight path, the contact between the pins 27a, 27b is closed. The time interval between the signals depends on the acceleration and is of the order of milliseconds.
  • the downstream electronics are designed such that an output signal appears when the acceleration of the primary impact is greater than 6 g and the light barrier 28, 29 responds for more than 20 ms.
  • the measurement of this acceleration-time area is also possible via the contact system 26, 27 or via a cooperation of the two contact systems. This minimum requirement for the size and duration of an acceleration prevents e.g. the very expensive airbag deploys due to a very hard and short bump in the road.
  • the light barrier detects the primary shock at the earliest possible time, further output signals can be derived from the membrane circuit board contact 26, 27 via the secondary and tertiary shocks. So that the inertial body 22 is not immediately caught again by the magnet system after the primary impact, the coil 24 should preferably be switched off via the light barrier 28, 29. However, it can also be expedient to use this light barrier to reduce the tear-off point of the electromagnet to 3.4 or 5 g.
  • the limit switch can be easily checked for the function of all components due to its electromagnetically controlled holding force.
  • the holding current is interrupted as part of a test program and the switch is lightly triggered. This makes it possible to determine whether both contact systems respond.
  • the mobility of the inertial body and the function of the electromagnet are checked.
  • the acceleration limit switch has the following tasks: Automatic switching on of the hazard warning lights because the driver may is unable to do so.
  • the optimal time for the seat belt release command strongly depends on the course of the accident. Only in the classic rear-end collision, in which the driving If the tool comes to a standstill immediately at the point of impact, the belt may be loosened about 2-3 seconds after the impact. However, if the vehicle collides several times or throws after the first impact, rolls over or slides on the roof, the belt must not open too early. The limit switch must therefore be able to signal additional minor accelerations, for example between 2 and 4 g, in the following seconds after the first response at 8 g, for example. This is possible if the response sensitivity is increased after the first contact. For this purpose, the current of the electromagnet is reduced or switched off in the design according to FIG.
  • the belt release command is only passed on if no contact has been made for a minimum time of, for example, 2-3 seconds. This ensures that the straps are unlocked neither too early nor too late.
  • the object of the invention is intended to be installed as standard in all types of passenger cars. For cost reasons, however, the complete monitoring programs should be reserved for upper and middle class vehicles.

Landscapes

  • Switches Operated By Changes In Physical Conditions (AREA)
  • Air Bags (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)

Description

Technisches GebietTechnical field

Die Erfindung betrifft einen Beschleunigungsgrenzwertschalter mit einem kugelförmigen Trägheitskörper aus ferromagnetischem Material, der von einem Magnetsystem in Ruhestellung gehalten ist und dem zwei voneinander isolierte Kontaktelemente gegenüberstehen, die beim Auftreffen des Trägheitskörpers durch elastische Verformung einer Membran kontaktierbar sind.The invention relates to an acceleration limit switch with a spherical inertial body made of ferromagnetic material, which is held in the rest position by a magnet system and which are opposed by two mutually insulated contact elements which can be contacted by elastic deformation of a membrane when the inertial body strikes.

Stand der TechnikState of the art

Aus der DE-A-30 22 878 ist ein Beschleunigungsgrenzwertschalter bekannt geworden, der im wesentlichen aus einem Dauermagneten, einer von diesem gehaltenen ferromagnetischen Kugel, einer Leiterplatte mit kammerartig ineinandergreifenden Kontaktfingern und einer elastischen, leitfähigen Membran besteht, die zwischen Kugel und Leiterplatte angeordnet ist. Beim Auftreten einer über dem Grenzwert liegenden Beschleunigung reisst die Kugel vom Magneten ab und fliegt dabei infolge ihrer Trägheit gegen die Membran, so dass diese unter Kontaktgabe kurzzeitig die Leiterplatte berührt. Die leitfähige oder mit einem leitfähigen Bereich ausgestattete Membran muss durch die besondere Ausgestaltung eines zweiteiligen Gehäuses gehalten werden. Die Leiterplatte wird in dem Gehäusedeckel durch Kontaktstifte gehalten.From DE-A-30 22 878 an acceleration limit switch has become known, which consists essentially of a permanent magnet, a ferromagnetic ball held by this, a circuit board with chamber-like interlocking contact fingers and an elastic, conductive membrane, which is arranged between the ball and the circuit board . If an acceleration above the limit value occurs, the ball tears off the magnet and, due to its inertia, flies against the membrane so that it briefly touches the circuit board while making contact. The conductive or equipped with a conductive area membrane must be held by the special design of a two-part housing. The circuit board is held in the housing cover by contact pins.

Es hat sich herausgestellt, dass die Fertigung der Gehäuse- und Funktionsteile des bekannten Beschleunigungsgrenzwertschalters noch zu lohnintensiv ist. So ist es beispielsweise erforderlich, die Kontaktbahnen der Leiterplatte zu vergolden, damit auch noch nach Jahren der Nichtbeanspruchung unter klimatisch ungünstigen Bedingungen ein sicheres Ansprechen gewährleistet ist.It has been found that the manufacture of the housing and functional parts of the known acceleration limit switch is still too cost-intensive. For example, it is necessary to gold-plate the contact tracks of the printed circuit board so that a reliable response is guaranteed even after years of non-use under climatically unfavorable conditions.

Aus der DE-A-27 49 807 ist ein elektrischer Trägheitsschalter bekannt geworden, der aus einem Elektromagneten und einer ferromagnetischen Kugel besteht. Die Kugel wird im Ruhezustand in einer flachen Vertiefung festgehalten, in der sie zwischen zwei voneinander isolierten Elementen einen Kontakt herstellt. Im Anregungsfall löst sich die Kugel unter Öffnung des Kontaktes aus ihrer Ruhelage.From DE-A-27 49 807 an electrical inertia switch has become known which consists of an electromagnet and a ferromagnetic ball. At rest, the ball is held in a shallow depression in which it makes contact between two elements which are isolated from one another. In the event of excitation, the ball releases from its rest position by opening the contact.

Darstellung der ErfindungPresentation of the invention

Der Erfindung liegt daher die Aufgabe zugrunde, die Steuerbarkeit des Grenzwertschalters noch stärker auszubauen, um aufeinanderfolgende Kontaktschliessungen zur Steuerung von Rückhalteeinrichtungen, Warnsystemen oder zur Unfallanalyse elektronisch auszuwerten und die Kontaktflächen mit geringstem Aufwand gegen Korrosion zu sichern.The invention is therefore based on the object of expanding the controllability of the limit switch even more, in order to electronically evaluate successive contact closings for controlling restraint devices, warning systems or for accident analysis, and to secure the contact surfaces against corrosion with little effort.

Diese Aufgabe wird durch die Merkmale gemäss dem zweiten Teil des Patentanspruches 1 gelöst.This object is achieved by the features according to the second part of patent claim 1.

Beschreibung der ZeichnungenDescription of the drawings

Ausführungsbeispiele der Erfindung werden anhand von Fig. 1-8 der Zeichnung dargestellt.

  • Fig. 1 zeigt einen Längsschnitt durch den oberen Teil des Kontaktsystems des neuartigen Beschleunigungsgrenzwertschalters,
  • Fig. 2 einen Klebefolienring,
  • Fig. 3 den unteren Teil des Kontaktsystems,
  • Fig. 4 einen Längsschnitt durch das Kontaktsystem,
  • Fig. 5 eine perspektivische Gesamtansicht,
  • Fig. 6 einen Längsschnitt durch eine abgewandelte Bauform,
  • Fig. 7 stellt einen Längsschnitt durch eine andere Bauform eines Beschleunigungsgrenzwertschalters dar,
  • Fig. 8 einen Querschnitt entlang der Linie AB in Fig. 7.
Embodiments of the invention are illustrated with reference to FIGS. 1-8 of the drawing.
  • 1 shows a longitudinal section through the upper part of the contact system of the novel acceleration limit switch,
  • 2 an adhesive film ring,
  • 3 shows the lower part of the contact system,
  • 4 shows a longitudinal section through the contact system,
  • 5 is an overall perspective view,
  • 6 shows a longitudinal section through a modified design,
  • 7 shows a longitudinal section through another design of an acceleration limit switch,
  • 8 shows a cross section along the line AB in FIG. 7.

In Fig. 6 ist mit 1 ein quaderförmiges oder zylindrisches Gehäuse bezeichnet, das im oberen Teil eine trichterförmige Aussparung 1a aufweist. In dieser Aussparung ist eine ferromagnetische Kugel 2 gelagert, die von einem Elektromagneten 7, 8 festgehalten wird. Der vorzugsweise zylindrische und in Achsrichtung gepolte Elektromagnet 7, 8 wird in einer bodenseitigen Öffnung des aus Kunststoff bestehenden Gehäuses befestigt. Vorzugsweise benutzt man einen Thermoplast, der den Elektromagnet 7, 8 durch Verformung der Kante 1 b arretiert. Der Boden der trichterförmigen Aussparung 1 ist als Kugelkalotte ausgebildet, so dass die Kugel 2 vom Elektromagneten 7, 8 durch eine gewisse Wandstärke getrennt ist, die als magnetischer Luftspalt wirkt. Die Kugel 2 wird in ihrer Ruheposition lediglich durch die Inhomogenität des magnetischen Streufeldes gehalten. Der mechanische Teil des Schalters besteht somit nur aus Elektromagnet, Kugel und Gehäuse. Mit 9, 10, 11, 12 sind eingepresste Metallstifte bezeichnet, die der alternativen Befestigung auf einer Leiterplatte dienen.In Fig. 6, 1 denotes a cuboid or cylindrical housing which has a funnel-shaped recess 1a in the upper part. A ferromagnetic ball 2, which is held by an electromagnet 7, 8, is mounted in this recess. The preferably cylindrical and axially polarized electromagnet 7, 8 is fastened in a bottom opening of the plastic housing. A thermoplastic is preferably used, which locks the electromagnet 7, 8 by deforming the edge 1b. The bottom of the funnel-shaped recess 1 is designed as a spherical cap, so that the ball 2 is separated from the electromagnet 7, 8 by a certain wall thickness, which acts as a magnetic air gap. The ball 2 is held in its rest position only by the inhomogeneity of the stray magnetic field. The mechanical part of the switch thus consists only of an electromagnet, ball and housing. With 9, 10, 11, 12 pressed-in metal pins are designated, which are used for alternative fastening on a circuit board.

Der elektrische Teil des Schalters wird durch eine teilweise metallisierte Doppelfolie 4 gebildet, die durch den Deckel 5 geschützt ist. Der vorzugsweise als Isolierstoffstanzteil ausgebildete Deckel 5 weist ebenso wie die Doppelfolie 4 Durchbrüche auf, durch die angeformte Niete 1c, 1 d, bestehend aus dem Werkstoff des Gehäuses, hindurchragen. Diese Niete werden bei der Montage des Schalters thermisch oder mittels Ultraschall verformt. Der Aufbau des elektrischen Teiles des Schalters ergibt sich aus den Fig. 1-4. Fig. 1 zeigt eine kreisförmige Kunststoffolie 4a mit einer seitlichen Anschlussfahne 4a1 und einer Kontaktmater 4a2.The electrical part of the switch is formed by a partially metallized double film 4, which is protected by the cover 5. The cover 5, which is preferably designed as an insulating stamped part, has, like the double film 4, openings, through which molded rivets 1c, 1 d, consisting of the material of the housing, protrude. These rivets are thermally or ultrasonically deformed when the switch is installed. The structure of the electrical part of the switch is shown in FIGS. 1-4. 1 shows a circular plastic film 4a with a lateral connecting lug 4a1 and a contact mat 4a2.

In Fig. 2 ist ein Kreisring 4b dargestellt, der aus zweiseitig klebender Kunststoffolie besteht.In Fig. 2 a circular ring 4b is shown, which consists of double-sided adhesive plastic film.

In Fig. 3 ist als Gegenstück zu Fig. 1 die Folie mit 4c bezeichnet, die eine seitliche Anschlussfahne 4c1 und eine Kontaktmater 4c2 trägt.In FIG. 3, as a counterpart to FIG. 1, the film is designated 4c, which carries a lateral connecting lug 4c1 and a contact mat 4c2.

Nach dem Verkleben der Teile 4a, 4b und 4c erhält man ein Kontaktelement 4, wie es überhöht gezeichnet in Fig. 4 dargestellt ist.After the parts 4a, 4b and 4c have been glued together, a contact element 4 is obtained, as is shown in an exaggerated manner in FIG. 4.

Zwischen den Teilen 4a und 4c bildet sich ein mit Luft gefüllter Hohlraum 6 aus, der durch den Ring 4b gegen die Aussenluft völlig abgedichtet ist. In dem Hohlraum 6 stehen sich die Metallschichten in einem Abstand von einigen Zehntel Millimetern gegenüber, so dass eine ausreichende Isolationsstrecke vorliegt. Beim Aufschlag der Kugel wird die untere Folie so weit elastisch verformt, dass kurzzeitig der Kontakt geschlossen wird. Die Teile 4a, 4b und 4c sind ohne Nietlöcher dargestellt. Ihr Durchmesser kann auch kleiner sein als der Nietlochkreis.An air-filled cavity 6 is formed between the parts 4a and 4c and is completely sealed off from the outside air by the ring 4b. In the cavity 6, the metal layers face each other at a distance of a few tenths of a millimeter, so that there is a sufficient insulation gap. When the ball hits, the lower film is elastically deformed to such an extent that the contact is briefly closed. The parts 4a, 4b and 4c are shown without rivet holes. Their diameter can also be smaller than the rivet hole circle.

Die Verformungskennlinie der Folie wird so gewählt, dass lediglich das Gewicht der Kugel noch nicht zur Kontaktgabe führt. Damit wird verhindert, dass der Schalter bei einem auf dem Dach liegenden Fahrzeug Dauerkontakt gibt, was z.B. zur Dauerblockierung des Gurtschlosses führen könnte.The deformation characteristic of the film is chosen so that only the weight of the ball does not lead to contact. This prevents the switch from making permanent contact when the vehicle is on the roof, which e.g. could permanently lock the belt buckle.

Da die Kugel 2 in ihrem Lager durch die Folien 4a, 4b und 4c sowie den Deckel 5 völlig gegen den Aussenraum abgedichtet ist und nicht mit ihrer Metalloberfläche an der elektrischen Kontaktierung beteiligt ist, benötigt ihre Oberfläche keine Edelmetallschicht.Since the ball 2 in its bearing is completely sealed from the outside space by the foils 4a, 4b and 4c and the cover 5 and is not involved in the electrical contacting with its metal surface, its surface does not require a noble metal layer.

Abweichend von Fig. 1-4 kann man die Kontaktmater 4a2 unmittelbar auf den Deckel 5 aufbringen, so dass dieser als Leiterplatte ausgebildet ist.In a departure from FIGS. 1-4, the contact mat 4a2 can be applied directly to the cover 5 so that it is designed as a circuit board.

Der Ansprechwert im Bereich von einigen g hängt stark von der Entfernung zwischen Elektromagnet und Kugel ab. Wenn man die Aufnahmeöffnung für den Elektromagneten als Pressitz ausbildet, kann man den Elektromagneten in mehreren Stufen einpressen und dabei den Grenzwert messen. Hierdurch lässt sich der Ansprechwert in engen Toleranzen einhalten.The response value in the range of a few g strongly depends on the distance between the electromagnet and the ball. If you form the receiving opening for the electromagnet as a press fit, you can press in the electromagnet in several stages and measure the limit value. This allows the response value to be maintained within narrow tolerances.

Fig. 5 zeigt den kompletten Schalter in der Perspektive. Das Gehäuse 1 besteht aus einem Quader, der in einen Halbzylinder übergeht. Damit steht in allen drei Koordinatenrichtungen mindestens eine ebene Fläche zur Montage auf einer Leiterplatte oder einem Gehäuse zur Verfügung. Das Kontaktsystem 4 hat, abweichend von Fig. 1-4, die Form eines Rechtecks mit anschliessender Halbkreisfläche.Fig. 5 shows the complete switch in perspective. The housing 1 consists of a cuboid that merges into a half cylinder. This means that at least one flat surface is available in all three coordinate directions for mounting on a printed circuit board or a housing. In contrast to FIGS. 1-4, the contact system 4 has the shape of a rectangle with an adjoining semicircular surface.

Mit 11, 12, 13, 14 sind eingepresste Stifte bezeichnet, die durch Einlöten oder Umknicken an einer Leiterplatte oder Gehäusewand fixierbar sind. Die Stifte, von denen in aller Regel nur ein Paar benötigt wird, können aber auch durch angeformte Bolzen aus dem Gehäusewerkstoff ersetzt werden, die nach der Montage zu einem Nietkopf umgeformt werden. Der Deckel 5 ist mit Hilfe der angeformten Nieten 1c, 1 d, 1 e, 1 f so befestigt, dass er nicht schadlos demontiert werden kann. Die Nieten können so verteilt sein, dass sie die Anschlussfahnen 4a1 und 4c1 oder das gesamte Kontaktsystem 4 nicht durchdringen. Im letzteren Fall wäre dann im Gehäuse 1 eine ringförmige Aussparung für das Kontaktsystem 4 vorzusehen, so dass der Deckel 5 unmittelbar auf dem Rand des Gehäuses 1 aufläge.With 11, 12, 13, 14 pressed-in pins are referred to, which can be fixed by soldering or bending on a circuit board or housing wall. The pins, of which usually only a pair is required, can also be replaced by molded bolts made of the housing material, which are formed into a rivet head after assembly. The cover 5 is fastened with the aid of the molded rivets 1c, 1 d, 1 e, 1 f in such a way that it cannot be removed without damage. The rivets can be distributed such that they do not penetrate the connection lugs 4a1 and 4c1 or the entire contact system 4. In the latter case, an annular recess for the contact system 4 would then be provided in the housing 1, so that the cover 5 would rest directly on the edge of the housing 1.

Die Bauform gemäss Fig. 6 zeigt, dass der untere Teil des Gehäuses 1 eine Spule 7 und einen Weicheisenkern 8 trägt. Die Spule 7 wird mit dem Einschalten der Zündung des Kraftfahrzeuges an das Bordnetz angeschlossen. Der Auslöse- oder Grenzwert des Schalters kann dann mit Hilfe eines Vorwiderstandes werksseitig leicht eingestellt werden. Es wäre aber auch denkbar, dass man dem Fahrer eine gewisse Einstellmöglichkeit anheimstellt, so dass er z.B. zwischen «Autobahn» und «Geländefahrt» umstellen kann. Dies kann dazu beitragen, eine teure Fehlauslösung eines Aufprallschutzes (Airbag) zu vermeiden.The design according to FIG. 6 shows that the lower part of the housing 1 carries a coil 7 and a soft iron core 8. The coil 7 is connected to the vehicle electrical system when the ignition of the motor vehicle is switched on. The tripping or limit value of the switch can then be easily adjusted in the factory using a series resistor. However, it would also be conceivable to give the driver a certain setting option, so that he e.g. can switch between «motorway» and «off-road driving». This can help to avoid expensive false triggering of an impact protection (airbag).

In Fig. 7 ist mit 21 ein vorzugsweise zylindrisches Kunststoffgehäuse bezeichnet, das einen zur Achse CD symmetrischen und trichter- oder kegelstumpfartigen Hohlraum 21 a umschliesst. In diesem Hohlraum ist ein ferromagnetischer, kugelförmiger Trägheitskörper 22 gelagert. Unter dem Trägheitskörper 22 ist ein zylindrischer ferromagnetischer Kern 23 angeordnet, der von einer Magnetspule 24 umgeben ist. Über die Spule 24 ist ein topfartiger ferromagnetischer Rückschluss 25 geschoben, der zur Einstellung des Beschleunigungsgrenzwertes bei bestimmtem Magnetisierungsstrom variierbar sein kann. Kern 23 und Rückschluss 25 sind durch einen aus dem Kernmaterial gebildeten angeformten Niet 23a dauerhaft verbunden. Der Rückschlusstopf 25 stellt zugleich einen mechanischen Schutz für die Spule 24 dar. Der Hohlraum 21 a wird nach oben hin durch eine gummielastische Membran 26 mit leitfähiger Mittelzone 26a und einer Leiterplatte 27 abgeschlossen. Die Leiterplatte 27 weist zwei Anschlussstifte 27a und 27b auf, die mit kammartig ineinandergreifenden Leiterstrukturen verbunden sind. Die Membran 26 ist in der Randzone 26b verstärkt, so dass die leitfähige Mittelzone die Leiterplatte im Ruhezustand nicht berührt. Membran 26 und Leiterplatte 27 sind durch den «umgebördelten» Kragen 21 h unverlierbar und abdichtend mit dem Gehäuse 21 verbunden. Bei Verwendung eines thermoplastischen Gehäusewerkstoffes kann die Verformung der Randzone 21 h mittels Ultraschall erfolgen.In FIG. 7, 21 denotes a preferably cylindrical plastic housing, which encloses a cavity 21 a which is symmetrical and funnel-like or truncated cone-like to the axis CD. A ferromagnetic, spherical inertial body 22 is mounted in this cavity. A cylindrical ferromagnetic core 23, which is surrounded by a magnetic coil 24, is arranged under the inertial body 22. A pot-like ferromagnetic yoke 25 is pushed over the coil 24 and can be varied to set the acceleration limit value for a specific magnetizing current. Core 23 and yoke 25 are permanently connected by a molded rivet 23a formed from the core material. The yoke 25 also provides mechanical protection for the coil 24. The cavity 21 a is closed at the top by a rubber-elastic membrane 26 with a conductive central zone 26 a and a printed circuit board 27. The printed circuit board 27 has two connecting pins 27a and 27b, which are connected to conductor structures which intermesh in a comb-like manner. The membrane 26 is reinforced in the edge zone 26b, so that the conductive central zone does not touch the circuit board in the idle state. Diaphragm 26 and printed circuit board 27 are captively and sealingly connected to housing 21 by the “flanged” collar 21 h. If a thermoplastic housing material is used, the edge zone 21 h can be deformed using ultrasound.

Die Membran 26 ist in ihrer Federkennlinie vorzugsweise so steif ausgebildet, dass allein vom Gewicht des Trägheitskörpers 22 noch keine Kontaktgabe ausgelöst wird. Wenn nun das Fahrzeug nach einem Primärstoss auf der Seite oder dem Dach über die Fahrbahn rutscht, erhält man eine Serie von auswertbaren Sekundärimpulsen, nicht jedoch in der Ruhelage einen Dauerkontakt.The membrane 26 is preferably so rigid in its spring characteristic that no contact is triggered by the weight of the inertial body 22 alone. If the vehicle slides over the road after a primary impact on the side or the roof, you get a series of evaluable secondary impulses, but not in the rest position a permanent contact.

Im Bereich der Schnittebene AB weist das Gehäuse 21 zwei auf einer optischen Achse liegende Bohrungen 21c, 21 d auf. In diese Bohrungen sind Sender 28 und Empfänger 29 einer Lichtschranke eingesetzt, deren optische Achse den kugelförmigen Trägheitskörper 22 in seiner Ruhelage schneidet.In the area of the sectional plane AB, the housing 21 has two bores 21c, 21d lying on an optical axis. Transmitters 28 and receivers 29 of a light barrier are inserted into these bores, the optical axis of which intersects the spherical inertial body 22 in its rest position.

Vorzugsweise geht der kegelstumpfartige Hohlraum 21 a in eine Kugelkalotte 21 b über. Die Bohrungen 21 c, 21 d können den Bereich der Kugelkalotte 21 b durchbrechen, um bei dem benutzten sichtbaren oder infraroten Licht Reflexionsverluste zu vermeiden.The frustoconical cavity 21 a preferably merges into a spherical cap 21 b. The holes 21 c, 21 d can break through the region of the spherical cap 21 b in order to be in the used visible or infrared light to avoid reflection losses.

Wenn man als Gehäusewerkstoff einen glasklaren Thermoplast verwendet, können die Bohrungen 21 c, 21 d am Übergang zur Kalotte 21 b mit eingeformten optischen Fenstern abgeschlossen sein. Die in sehr kleinen Abmessungen lieferbaren zylindrischen Leucht- und Empfängerdioden werden in den Bohrungen durch Giessharztropfen oder dauerplastische Kittmasse abdichtend befestigt. Die herausgeführten Anschlussdrähte sind mit 28a, 29a bezeichnet.If a clear thermoplastic is used as the housing material, the bores 21 c, 21 d at the transition to the calotte 21 b can be closed with molded optical windows. The cylindrical light-emitting diodes and receiver diodes, which are available in very small dimensions, are sealed in the holes by casting resin drops or permanently plastic putty. The lead wires led out are designated 28a, 29a.

Um zu vermeiden, dass der kugelförmige Trägheitskörper 22 bei tangentialen Stössen in dem Hohlraum 21 a auf einer kegelmantelförmigen Spirale umläuft, sind in den Kegelmantel prismenartige Rippen 21 e, 21f, 21 g eingearbeitet, die ein Trudeln des Trägheitskörpers 22 verhindern oder zumindest stark abbremsen. Eine ähnliche Wirkung wäre durch entsprechende Vertiefungen erzielbar.In order to prevent the spherical inertial body 22 from rotating on a conical jacket-shaped spiral in the event of tangential impacts in the cavity 21a, prism-like ribs 21e, 21f, 21g are incorporated into the conical jacket, which prevent the inertial body 22 from spinning or at least slow it down. A similar effect could be achieved through appropriate deepening.

Der gesamte Beschleunigungsgrenzwertschalter kann mittels der Anschlussstifte 27a, 27b hängend auf einer grösseren Leiterplatte befestigt werden. Mit dieser Leiterplatte sind dann auch die Anschlussdrähte 28a, 29a zu verlöten.The entire acceleration limit switch can be attached to a larger circuit board by means of the connecting pins 27a, 27b. The connecting wires 28a, 29a are then also to be soldered to this circuit board.

Fig. 8 zeigt den Querschnitt des Gehäuses 21 und des Trägheitskörpers 22 sowie die Draufsicht auf den Rückschluss 25. In die Bohrungen 21 c, 21 d sind Sender 28 und Empfänger 29 eingesetzt. Die optische Achse ist mit der Linie EF angedeutet.8 shows the cross section of the housing 21 and the inertial body 22 and the top view of the inference 25. The transmitter 28 and receiver 29 are inserted into the bores 21 c, 21 d. The optical axis is indicated by the line EF.

Die Gebrauchslage des Schalters entspricht der Darstellung, in der die Symmetrieachse CD mit der Vertikalen, also der Schwerkraftrichtung zusammenfällt. Infolge der rotations-symmetrischen Gestaltung des Hohlraumes 21 und des Haltemagneten 23, 24, 25 ist der Ansprechwert für alle auf der Achse CD senkrecht stehenden Beschleunigungsrichtungen gleich. Es hat also - mit anderen Worten - auf den Ansprechwert keinen Einfluss, ob das mit dem Schalter ausgerüstete Fahrzeug von vorn, von hinten oder von der Seite angestossen wird. Bei Stössen in Richtung der Achse CD ist die Empfindlichkeit allerdings wesentlich grösser.The position of use of the switch corresponds to the representation in which the axis of symmetry CD coincides with the vertical, ie the direction of gravity. As a result of the rotationally symmetrical design of the cavity 21 and the holding magnet 23, 24, 25, the response value is the same for all acceleration directions perpendicular to the axis CD. In other words, it has no influence on the response value whether the vehicle equipped with the switch is pushed from the front, from the rear or from the side. In the case of impacts in the direction of the CD axis, however, the sensitivity is considerably greater.

Der beschriebene Schalter weist zwei voneinander unabhängige Kontaktsysteme auf. Bei Überschreitung der über die Spule 24 einstellbaren magnetischen Haltekraft reisst der Körper 22 ab, so dass nach sehr kurzem Laufweg die Schranke 28, 29 anspricht. Am Ende des Roll-oder Flugweges wird der Kontakt zwischen den Stiften 27a, 27b geschlossen. Der zeitliche Abstand zwischen den Signalen ist beschleunigungsabhängig und liegt in der Grössenordnung von Millisekunden.The switch described has two independent contact systems. If the magnetic holding force which can be set via the coil 24 is exceeded, the body 22 tears off, so that the barrier 28, 29 responds after a very short travel distance. At the end of the taxiway or flight path, the contact between the pins 27a, 27b is closed. The time interval between the signals depends on the acceleration and is of the order of milliseconds.

Die nachgeschaltete Elektronik ist bei einem bevorzugten Ausführungsbeispiel der Erfindung so ausgebildet, dass ein Ausgangssignal erscheint, wenn die Beschleunigung des Primärstosses grösser ist als 6 g und die Lichtschranke 28, 29 länger als 20 ms anspricht. Die Messung dieser Beschleunigungs-Zeit-Fläche ist aber auch über das Kontaktsystem 26, 27 oder über ein Zusammenwirken beider Kontaktsysteme möglich. Durch diese Mindestanforderung an Grösse und Zeitdauer einer Beschleunigung wird verhindert, dass z.B. der sehr teure Airbag aufgrund eines sehr harten und kurzen Fahrbahnstosses auslöst.In a preferred exemplary embodiment of the invention, the downstream electronics are designed such that an output signal appears when the acceleration of the primary impact is greater than 6 g and the light barrier 28, 29 responds for more than 20 ms. However, the measurement of this acceleration-time area is also possible via the contact system 26, 27 or via a cooperation of the two contact systems. This minimum requirement for the size and duration of an acceleration prevents e.g. the very expensive airbag deploys due to a very hard and short bump in the road.

Während die Lichtschranke den Primärstoss zum frühestmöglichen Zeitpunkt erfasst, können weitere Ausgangssignale über die Sekundär- und Tertiärstösse von dem Membran-LeiterplattenKontakt 26, 27 abgeleitet werden. Damit der Trägheitskörper 22 nach dem Primärstoss nicht sofort wieder vom Magnetsystem eingefangen wird, soll vorzugsweise über die Lichtschranke 28, 29 die Spule 24 abgeschaltet werden. Es kann aber auch zweckmässig sein, mit Hilfe dieser Lichtschranke den Abreisspunkt des Elektromagneten auf 3,4 oder 5 g zu reduzieren.While the light barrier detects the primary shock at the earliest possible time, further output signals can be derived from the membrane circuit board contact 26, 27 via the secondary and tertiary shocks. So that the inertial body 22 is not immediately caught again by the magnet system after the primary impact, the coil 24 should preferably be switched off via the light barrier 28, 29. However, it can also be expedient to use this light barrier to reduce the tear-off point of the electromagnet to 3.4 or 5 g.

Mit einer der Aufgabe angepassten Auswerteeinrichtung kann man folgendes messen:

  • a) Die absolute mittlere Beschleunigung während der Zeit zwischen dem Lichtschranken- und dem Leiterplattenkontakt,
  • b) die Verweildauer des Körpers 22 an der Membran 26, die Aufschluss über das Bestehen und die Dauer einer gewissen Mindestbeschleunigung gibt,
  • c) die Zahl der Beschleunigungsstösse vom Primärstoss über Sekundär- und Tertiärstösse bis zum völligen Stillstand des Fahrzeuges, wobei die erste oder zweite Kontaktstrecke zur einmaligen oder mehrfachen Reduzierung des Spulenstromes und damit des Grenzwertes benutzt werden kann,
  • d) den Abreisszeitpunkt unabhängig vom Aufschlagzeitpunkt.
The following can be measured with an evaluation device adapted to the task:
  • a) The absolute mean acceleration during the time between the light barrier and the circuit board contact,
  • b) the length of stay of the body 22 on the membrane 26, which provides information about the existence and the duration of a certain minimum acceleration,
  • c) the number of acceleration shocks from the primary shock to secondary and tertiary shocks until the vehicle comes to a complete standstill, the first or second contact path being able to be used to reduce the coil current and thus the limit value once or several times,
  • d) the time of tear-off regardless of the time of impact.

Nicht zu unterschätzen ist der Vorteil, dass selbst bei Versagen eines der beiden Kontaktsysteme noch alle Notmassnahmen einleitbar sind. Das System ist also zweifach redundant.The advantage is not to be underestimated that even if one of the two contact systems fails, all emergency measures can still be initiated. The system is therefore double redundant.

Im übrigen kann der Grenzwertschalter infolge seiner elektromagnetisch geregelten Haltekraft leicht auf die Funktion aller Komponenten geprüft werden. Dazu wird im Rahmen eines Testprogrammes der Haltestrom unterbrochen und der Schalter leicht angestossen. Damit ist feststellbar, ob beide Kontaktsysteme ansprechen. Zugleich wird hierdurch die Beweglichkeit des Trägheitskörpers und die Funktion des Elektromagneten geprüft.In addition, the limit switch can be easily checked for the function of all components due to its electromagnetically controlled holding force. For this purpose, the holding current is interrupted as part of a test program and the switch is lightly triggered. This makes it possible to determine whether both contact systems respond. At the same time, the mobility of the inertial body and the function of the electromagnet are checked.

Der Beschleunigungsgrenzwertschalter hat folgende Aufgaben: Automatische Einschaltungen der Warnblinkanlage, weil der Fahrer u.U. dazu nicht in der Lage ist.The acceleration limit switch has the following tasks: Automatic switching on of the hazard warning lights because the driver may is unable to do so.

Auslöser für eine Türentriegelung,Trigger for a door release,

Aktivierung eines Aufprallschutzes, insbesondere eines Airbags,Activation of impact protection, in particular an airbag,

Einsatz elektromotorischer Mittel, die sofort nach einer abnormen Beschleunigung das Gurtsystem strammziehen,Use of electromotive means that pull the belt system tight immediately after an abnormal acceleration,

Verwendung automatischer Gurtlösesysteme, die das Aussteigen oder Bergen der Unfallopfer erleichtern sollen.Use of automatic belt release systems that should make it easier for the victim to get out or recover.

Der optimale Zeitpunkt des Gurtlösebefehls hängt stark vom Hergang des Unfalles ab. Nur bei dem klassischen Auffahrunfall, bei dem das Fahrzeug unmittelbar am Aufprallort zum Stillstand kommt, darf der Gurt etwa 2-3 Sekunden nach dem Aufprall gelöst werden. Falls das Fahrzeug aber mehrfach aufprallt oder nach dem ersten Stoss schleudert, sich überschlägt oder auf dem Dach weiterrutscht, darf sich der Gurt nicht zu früh öffnen. Der Grenzwertschalter muss somit in der Lage sein, nach dem ersten Ansprechen bei beispielsweise 8 g in den nachfolgenden Sekunden zusätzliche kleinere Beschleunigungen, z.B. zwischen 2 und 4 g zu signalisieren. Dies ist möglich, wenn die Ansprechempfindlichkeit nach der ersten Kontaktgabe vergrössert wird. Hierzu wird in der Bauart nach Fig. 6 der Strom des Elektromagneten reduziert oder abgeschaltet, so dass es bis zum absoluten Fahrzeugstillstand zu mehrfachen Kontaktschliessungen kommt. Der Gurtlösebefehl wird erst dann weitergegeben, wenn für eine Mindestzeit von z.B. 2-3 Sekunden keine Kontaktgabe erfolgte. Damit wird sicher erreicht, dass die Gurte weder zu früh noch zu spät entriegelt werden.The optimal time for the seat belt release command strongly depends on the course of the accident. Only in the classic rear-end collision, in which the driving If the tool comes to a standstill immediately at the point of impact, the belt may be loosened about 2-3 seconds after the impact. However, if the vehicle collides several times or throws after the first impact, rolls over or slides on the roof, the belt must not open too early. The limit switch must therefore be able to signal additional minor accelerations, for example between 2 and 4 g, in the following seconds after the first response at 8 g, for example. This is possible if the response sensitivity is increased after the first contact. For this purpose, the current of the electromagnet is reduced or switched off in the design according to FIG. 6, so that multiple contact closings occur until the vehicle is at a complete standstill. The belt release command is only passed on if no contact has been made for a minimum time of, for example, 2-3 seconds. This ensures that the straps are unlocked neither too early nor too late.

Gewerbliche VerwertbarkeitCommercial usability

Der Gegenstand der Erfindung ist dazu bestimmt, serienmässig in alle Typen von Personenkraftwagen eingebaut zu werden. Aus Kostengründen dürften aber die kompletten Überwachungsprogramme den Fahrzeugen der oberen und mittleren Klasse vorbehalten bleiben.The object of the invention is intended to be installed as standard in all types of passenger cars. For cost reasons, however, the complete monitoring programs should be reserved for upper and middle class vehicles.

Claims (16)

1. An acceleration limit switch having a spherical inertia member (2; 22) of ferromagnetic material which is held in the position of rest by a magnet system (7, 8; 24) and opposite which there are two contact elements (4c1, 4a1) which are insulated from one another and which, on impact of the inertia member (2; 22), can be contacted by elastic deformation of a diaphragm (4c, 26), characterised in that the diaphragm (4c) consists of a sheet of insulating material covered with a contact matrix (4c1) and separated from a second contact matrix (4a2) applied to a sheet of insulating material by a ring of insulating material (4b) in the state of rest, that the diaphragm (4c; 26) is connected, in an air-tight manner, to a further diaphragm (4a) or a printed circuit board (27), that the magnet system is constructed in the form of an electromagnet (7, 8; 24) for the purpose of being able to control the response value and that the cavity (21 a) receiving the inertia member (2; 22) is monitored, transversely to the axis of symmetry (CD), in the region of the position of rest of the inertia member, by a light barrier (28, 29) consisting of transmitter (28) and receiver (29).
2. An acceleration limite switch as claimed in Claim 1, characterised in that the second diaphragm or sheet (4a) is supported by a cover (5) which closes the funnel-shaped housing opening (1 a) with the inertia member (2).
3. An acceleration limit switch as claimed in Claim 2, characterised in that the second contact matrix (4a2) is applied to a printed-circuit board serving as a cover which is connected, in an air-tight manner, to the resilient diaphragm by means of a ring of insulating material which is adhesive on two sides.
4. An acceleration limit switch as claimed in Claim 1-3, characterised in that the cover (5) and the diaphragm or diaphragms are connected, in a sealing manner, to the housing (1) consisting of thermoplastic, by means of rivets (1 c, 1 d, 1 e, 1 f) formed thereon.
5. An acceleration limit switch as claimed in Claim 1, characterised in that the frusto-conical- like cavity (21 a) changes over into a spherical segment (21 b) in the region of the position of rest of the inertia member and that the light barrier (28, 29) passes through the spherical segment (21 b).
6. An acceleration limit switch as claimed in Claim 1, characterised in that the housing (1) comprises through bores (21 c, 21 d) in the region of the optical axis (E, F).
7. An accelerated limit switch as claimed in Claim 6, characterised in that a light-emitting diode (28) and a receiver diode (29) are inserted in the bores (21 c. 21 d) and that these components are sealed towards the exterior.
8. An acceleration limit switch as claimed in Claim 1 and 5, characterised in that the housing (21) consists of light-transmitting plastics material and blind holes, which change over into optical windows towards the spherical segment (21 b), are provided to receive the light barrier (28,29).
9. An acceleration limit switch as claimed in Claim 1, characterised in that the inertia member (22) is held by an electromagnet (23, 24, 25) which is symmetrical with respect to the axis of the cone (CD) and the coil (24) of which is surrounded by an adjustable return member (25).
10. An acceleration limit switch as claimed in Claim 1, characterised in that, as a result of its spring characteristic, the diaphragm (26) does not make any contact under the weight of the inertia member (22).
11. An acceleration limit switch as claimed in Claim 1, characterised in that prism-like ribs (21 e, 21 f, 21 g) are incorporated in the frusto-conical- like cavity (21 a) and brake any spinning of the inertia member (22).
12. An acceleration limit switch as claimed in Claim 1, characterised in that the light barrier (28, 29) and the printed-circuit-board contact (26, 27) are followed by an evaluation electronic device which detects the lifting of the inertia member (22), its impact on the printed circuit board (27) and its return to the position of rest in the course of time and derives control instructions therefrom.
13. An acceleration limit switch as claimed in Claim 1 and 12, characterised in that if a specific acceleration-time surface is exceeded, an initial contact is effected.
14. An acceleration limit switch as claimed in Claim 1 and 12, characterised by an evaluation circuit which switches off or considerably reduces the exciting current of the coil (24) after the primary shock.
15. An acceleration limit switch as claimed in Claim 1 and 12, characterised in that the printed-circuit board contact (26, 27) signals secondary shocks which occur when the vehicle is on its side or its roof.
16. An acceleration limit switch as claimed in Claim 12, characterised in that, by means of the various contact systems (26, 27, 28, 29), the flight time of the inertia member (22) is detected and fed to an acceleration computer.
EP84104009A 1983-04-12 1984-04-10 Acceleration value limiting switch Expired EP0125493B1 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE8310623U DE8310623U1 (en) 1983-04-12 1983-04-12 Acceleration limit switch
DE3313033 1983-04-12
DE3313033A DE3313033C1 (en) 1983-04-12 1983-04-12 Acceleration limit-value switch
DE8401991U DE8401991U1 (en) 1983-04-12 1984-01-25 Acceleration limit switch
DE3402387 1984-01-25
DE3402387A DE3402387C2 (en) 1983-04-12 1984-01-25 Acceleration limit switch

Publications (2)

Publication Number Publication Date
EP0125493A1 EP0125493A1 (en) 1984-11-21
EP0125493B1 true EP0125493B1 (en) 1987-07-15

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EP84104009A Expired EP0125493B1 (en) 1983-04-12 1984-04-10 Acceleration value limiting switch

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EP (1) EP0125493B1 (en)
DE (3) DE8310623U1 (en)

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RU2562057C2 (en) * 2013-12-30 2015-09-10 Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" (Госкорпорация "Росатом") Inertia-type switch
RU2693836C1 (en) * 2018-09-06 2019-07-05 Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" (Госкорпорация "Росатом") Inertial switch
DE102019204264A1 (en) * 2019-03-27 2020-05-20 Audi Ag Sensor for a seat belt system of a vehicle seat
DE102020007582B4 (en) * 2019-12-19 2021-12-23 Timo Martocchia Measuring device / sensor system for measuring, transmitting and processing relevant performance data from training and competition in contact sports, in particular physical contact and the effects of forces on it
RU2754918C1 (en) * 2020-10-26 2021-09-08 Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" (Госкорпорация "Росатом") Inertial type threshold detector

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DE8401991U1 (en) 1984-06-28
DE8310623U1 (en) 1983-09-08
DE3402387C2 (en) 1986-01-23
DE3402387A1 (en) 1985-07-25
EP0125493A1 (en) 1984-11-21

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