EP0600943B1 - Housing section for an electric circuit to be protected from pollutants, e.g. a motor vehicle locking system - Google Patents
Housing section for an electric circuit to be protected from pollutants, e.g. a motor vehicle locking system Download PDFInfo
- Publication number
- EP0600943B1 EP0600943B1 EP92916952A EP92916952A EP0600943B1 EP 0600943 B1 EP0600943 B1 EP 0600943B1 EP 92916952 A EP92916952 A EP 92916952A EP 92916952 A EP92916952 A EP 92916952A EP 0600943 B1 EP0600943 B1 EP 0600943B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing section
- pressure member
- housing
- motor vehicle
- locking system
- 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
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/02—Details
- H01H13/04—Cases; Covers
- H01H13/06—Dustproof, splashproof, drip-proof, waterproof or flameproof casings
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
- G05G1/00—Controlling members, e.g. knobs or handles; Assemblies or arrangements thereof; Indicating position of controlling members
- G05G1/02—Controlling members for hand actuation by linear movement, e.g. push buttons
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00944—Details of construction or manufacture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/02—Bases, casings, or covers
- H01H9/04—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings
- H01H2009/048—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings using a sealing boot, e.g. the casing having separate elastic body surrounding the operating member and hermetically closing the opening for it
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2223/00—Casings
- H01H2223/002—Casings sealed
Definitions
- the invention relates to a housing part for an electrical circuit arrangement to be protected against harmful substances, e.g. a vehicle locking system.
- the invention was initially developed for the buttons on the handheld transmitter of a remote-controlled vehicle locking system.
- the new development of the buttons on a vehicle on-board computer was also considered.
- the invention is also particularly suitable for these two cases.
- the invention is also suitable for many other applications, particularly also in those in which it is against the tightness of a housing which contains circuit arrangements, on a reliable, particularly easily and inexpensively, tightness Pollutants arrive.
- the invention is based on the object defined in the preamble of claim 1, which is generally known per se.
- a major problem with the housings of such circuit arrangements is often the sensitivity of their electronic components to environmental influences, in particular to moisture or water, but also to contamination. Critical is among other things the tightness between the buttons and the housing, because harmful substances can penetrate through the gaps between the buttons and the adjacent housing part.
- Such keys generally contain a probe body or pressure body, which is used to actuate a switch controlling the circuit arrangement, especially when the switch contains metallic contacts.
- a probe body or pressure body which is used to actuate a switch controlling the circuit arrangement, especially when the switch contains metallic contacts.
- different types of switches can also be involved in the invention act, which are to be operated via the feeler or pressure body.
- pressure bodies are referred to below, although the pressure required for actuation can in principle also be so small that one could speak of "probe bodies”.
- the pressure bodies are made of a soft elastic material, e.g. Made of rubber, silicone or TPE and then glued to the hard housing at their edges or on all-round protruding collars or brims, where they are often additionally clamped tightly by means of webs, clips, tabs, etc., in order to achieve the desired tightness.
- the outer surface of the edge of the pressure body is additionally given a complicated notched or grooved shape and then the pressure body is pressed into the hole in the housing part in such a way that the complicatedly shaped edge is pressed against the circumference of the hole in order to achieve effects similar to those of labyrinth seals.
- the pressure hulls are made of hard material without the watertightness between the key body and the housing. Instead, there is a space under the pressure elements, often also under the switches, which is not protected against the harmful substances, but which in turn has a wall with a sealing membrane as a seal against the electronics inside the housing.
- thermoplastic materials which have been welded to hard thermoplastic materials or in the liquid or pasty state were pressed together, adhere well to each other after cooling, although they are two different materials with different properties.
- Both figures each show a section of the housing G, which is made of hard thermoplastic or at least formed with the help of hard thermoplastic. It can e.g. are the housing of a handheld transmitter of a remotely controllable vehicle central locking system which is known and works on an infrared or radio basis.
- a pressure body D made of soft thermoplastic material and accessible from outside the housing G is fastened to the housing part G shown.
- This pressure element D is used to actuate - in the example shown only one single electrical switch which has already been fitted inside the housing I or which is to be fitted later, cf. the switch S in FIG. 1, which additionally contains a key body T as an example, and cf. the switch C / L in FIG. 2, which on the one hand consists of a conductive covering C, for example, depends on a thickening T, which in turn forms a section of the pressure body D on its inner surface, that is to say in turn also consists of soft thermoplastic material, and also consists of the end sections of lines L on a printed circuit board A which is attached to the interior I of the housing G.
- edges R of the pressure element D cover the hole made for the switch actuation in the housing part G in a completely waterproof and adhesive-free manner in the manner according to the invention. This is achieved in that these edges R are sprayed directly onto the plastic of the housing part G in such a way that the soft thermoplastic of the pressure body D and the hard thermoplastic plastic of the housing part G onto the plastic of the housing part G are fused together in a watertight manner at their contacting interfaces.
- the reliable tightness between the housing G and its keys D / S or D / C / L is achieved with little effort, above all without the need for adhesive between the interfaces.
- the principle according to the invention is particularly suitable for the mass production of such housings G.
- the hardness of the plastic housing not only gives the housing G the required rigidity and strength if it is the handheld transmitter of a motor vehicle locking system, e.g. of a motor vehicle central locking system, so if this housing G has the particularly water-sensitive or moisture-sensitive electronic transmitter components in its interior I - cf. the processor P shown symbolically therefor, the button structure D / S or D / C / L containing the switch then being used to control the transmitter.
- the hardness of the plastic housing gives the housing G the often very desirable rigidity and strength even if the housing G contains other circuit arrangements, e.g. the - among other things moisture-sensitive - on-board computer of the motor vehicle, or if the - portable or permanently installed - housing G also contains any other circuit arrangements.
- the edges R of the pressure body D attached to the outer surface of the housing part G achieve a fairly robust connection between the plastics of the housing part G and the pressure body D.
- the finished structure G / D is later subjected to particularly high mechanical stresses - e.g. if the structure belongs to the hand-held transmitter of the motor vehicle locking system and the keychain in the pocket of a driver could scratch the edge R - then the robustness can prevent accidental damage the fusion of the edge R with the housing part G can also be further increased in that the pressure body D sprayed onto the housing part G so that the edges R abut the inner surface of the housing part G, cf. the figure 2.
- the pressure element D can have a conductive coating C as a contact surface of the switch S at least more or less in the middle of its inner surface.
- This covering C can e.g. consist of metal or a silver-containing graphite mass and cover a more or less large section of the inner surface of the pressure body D.
- This covering C is located at a point such that when the end user presses the pressure body D, the two lines L, e.g. 2 are mounted on a printed circuit board A, are bridged by the conductive coating C and thus the switching path of this switch C / L is conductive.
- the pressure body D can more or less in the middle of its inner surface an extension T or towards the switch C / L, S Have thickening T, cf. FIG. 2.
- the housing part G can be held by a holding body corresponding to the shape of the housing G at the moment when the pressure body D is injection molded by an injection molding machine.
- the housing part G can e.g. be held as a prefabricated body by the holding body.
- the housing part G and the pressure body D can also be produced by means of a tool body, each with its own mold cavity for the housing part G and for the pressure body D, by more or less simultaneous injection molding of both parts G and D. Then the mold cavity intended for the housing part G simultaneously represents, so to speak, the holding body for this housing part G.
- the invention therefore also has the advantage of permitting very different processes for their production, so that the production can be easily adapted to the conditions prevailing in the workshops.
Abstract
Description
Die Erfindung betrifft ein Gehäuseteil für eine vor Schadstoffen zu schützende elektrische Schaltungsanordnung z.B. eines KFZ-Schließsystemes.The invention relates to a housing part for an electrical circuit arrangement to be protected against harmful substances, e.g. a vehicle locking system.
Die Erfindung wurde zunächst zwar für die Tasten an dem Handsender eines fernsteuerbaren KFZ-Schließsystemes entwickelt. Auch an die Neuentwicklung der Tasten bei einem KFZ-Bordcomputer war dabei gedacht. Die Erfindung eignet sich für diese beiden Fälle auch besonders gut. Es stellte sich aber schließlich heraus, daß sich die Erfindung auch für viele andere Anwendungsfälle eignet, besonders auch in solchen, in denen es bei den Tasten von Gehäusen, die Schaltungsanordnungen enthalten, auf eine zuverlässige, besonders auch in Massenfertigung leicht und preiswert erreichbare Dichtigkeit gegen Schadstoffe ankommt.The invention was initially developed for the buttons on the handheld transmitter of a remote-controlled vehicle locking system. The new development of the buttons on a vehicle on-board computer was also considered. The invention is also particularly suitable for these two cases. However, it finally turned out that the invention is also suitable for many other applications, particularly also in those in which it is against the tightness of a housing which contains circuit arrangements, on a reliable, particularly easily and inexpensively, tightness Pollutants arrive.
Die Erfindung geht von dem im Oberbegriff des Patentanspruches 1 definierten Gegenstand aus, der für sich allgemein bekannt ist.The invention is based on the object defined in the preamble of claim 1, which is generally known per se.
Ein Hauptproblem der Gehäuse solcher Schaltungsanordnungen ist oft die Empfindlichkeit ihrer elektronischen Bauteile gegen Umwelteinflüsse, besonders gegen Feuchtigkeit bzw. Wasser, aber auch gegen Verschmutzungen. Kritisch ist u.a. die Dichtigkeit zwischen den Tasten und dem Gehäuse, weil schädliche Stoffe durch die Spalten zwischen den Tasten und dem angrenzenden Gehäuseteil dringen können.A major problem with the housings of such circuit arrangements is often the sensitivity of their electronic components to environmental influences, in particular to moisture or water, but also to contamination. Critical is among other things the tightness between the buttons and the housing, because harmful substances can penetrate through the gaps between the buttons and the adjacent housing part.
Dabei enthalten solche Tasten im allgemeinen einen Tastkörper bzw. Druckkörper, der zur Betätigung eines die Schaltungsanordnung steuernden Schalters dient, und zwar vor allem dann, wenn der Schalter metallische Kontakte enthält. Es kann sich aber bei der Erfinoung im Prinzip auch um andersartige Schalter handeln, welche über den Tastkörper bzw. Druckkörper betätigt werden sollen. Der Einfachheit wegen wird dabei im folgenden nur von "Druckkörpern" gesprochen, obwohl der zur Betätigung benötigte Druck im Prinzip auch so klein sein kann, daß eher von "Tastkörpern" gesprochen werden könnte.Such keys generally contain a probe body or pressure body, which is used to actuate a switch controlling the circuit arrangement, especially when the switch contains metallic contacts. However, in principle, different types of switches can also be involved in the invention act, which are to be operated via the feeler or pressure body. For the sake of simplicity, only "pressure bodies" are referred to below, although the pressure required for actuation can in principle also be so small that one could speak of "probe bodies".
Zur Vermeidung jener schädlichen Umwelteinflüsse sind viele Maßnahmen bekannt.Many measures are known to avoid those harmful environmental influences.
Z.B. werden die Druckkörper aus einem weichen elastischen Material hergestellt, z.B. aus Gummi, Silikon oder TPE und danach an ihren Rändern oder an seitlich rundum abstehenden Kragen bzw. Krempen wasserdicht mit dem harten Gehäuse verklebt und dort oft auch zusätzlich durch Stege, Spangen, Laschen usw. rundum fest eingeklemmt, um die gewünschte Dichtigkeit zu erreichen. Manchmal wird der Außenfläche des Randes der Druckkörper zusätzlich eine komplizierte gekerbte oder gerillte Form gegeben und danach der Druckkörper so in das Loch des Gehäuseteils gepreßt, daß der kompliziert geformte Rand gegen den Lochumfang gedrückt ist, um ähnliche Wirkungen wie bei Labyrinthdichtungen zu erreichen.E.g. the pressure bodies are made of a soft elastic material, e.g. Made of rubber, silicone or TPE and then glued to the hard housing at their edges or on all-round protruding collars or brims, where they are often additionally clamped tightly by means of webs, clips, tabs, etc., in order to achieve the desired tightness. Sometimes the outer surface of the edge of the pressure body is additionally given a complicated notched or grooved shape and then the pressure body is pressed into the hole in the housing part in such a way that the complicatedly shaped edge is pressed against the circumference of the hole in order to achieve effects similar to those of labyrinth seals.
Mitunter werden aber auch die Druckkörper aus hartem Material hergestellt unter Verzicht auf die Wasserdichtigkeit zwischen dem Tastenkorper und dem Gehäuse. Statt dessen befindet sich dann unter den Druckkörpern, oft auch noch unter den Schaltern, ein gegen die schädlichen Stoffe ungeschützter Raum, der dann aber seinerseits eine Wand mit einer dichtenden Membrane als Abdichtung gegen die Elektronik im Inneren des Gehäuses aufweist.Sometimes, however, the pressure hulls are made of hard material without the watertightness between the key body and the housing. Instead, there is a space under the pressure elements, often also under the switches, which is not protected against the harmful substances, but which in turn has a wall with a sealing membrane as a seal against the electronics inside the housing.
Alle diese bekannten Lösungen sind aber relativ aufwendig und oft hinsichtlich ihrer Langzeitzuverlässigkeit unbefriedigend.However, all these known solutions are relatively complex and often unsatisfactory in terms of their long-term reliability.
Für sich ist außerdem bekannt, daß weiche thermoplastische Kunststoffe, die mit harten thermoplastischen Kunststoffen verschweißt wurden oder im flüssigen bzw. teigigen Zustanc aufeinander gepreßt wurden, nach dem Erkalten gut aneinander haften, obwohl es sich um zweierlei Materialien mit unterschiedlichen Eigenschaften handelt.It is also known per se that soft thermoplastic materials which have been welded to hard thermoplastic materials or in the liquid or pasty state were pressed together, adhere well to each other after cooling, although they are two different materials with different properties.
Die Aufgabe,
- mit besonders wenig Aufwand eine zuverlässige Dichtigkeit zwischen dem Gehäuse und seinen Tasten zu erreichen, wird erfindungsgemäß durch den im Patentanspruch 1 definierten Gegenstand gelöst.The task,
- Achieving a reliable seal between the housing and its keys with particularly little effort is achieved according to the invention by the object defined in claim 1.
Die in den Unteransprüchen definierten Gegenstände gestatten, zusätzliche Vorteile zu erreichen. U.a. gestatten nämlich die zusätzlichen Maßnahmen gemäß dem Patentanspruch
- 2,
- eine besondere Robustheit gegen unbeabsichtigtes Beschädigen der Verschmelzung des Randes mit dem Gehäuseteil zu erreichen,
- 3,
- auch den Schalter mit besonders wenig Aufwand herstellen zu können,
- 4,
- den Schalter mit ganz besonders wenig Aufwand herstellen zu können, jedenfalls solange die Schaltstrecke des Schalters im durchgeschalteten Zustand nicht besonders niedrige Werte aufweisen muß,
- 5,
- Abstand zwischen der Außenoberfläche des Druckkörpers und der Schaltstrecke des Schalters, damit oft auch den Abstand zwischen der Außenoberfläche des Druckkörpers und einer gedruckten Schaltung, die im Gehäuseinneren als Träger der Schaltungsanordnung angebracht werden kann, entsprechend vergrößern zu können,
- 6 und 7,
- in zwei Anwendungsfällen, in denen der Endverbraucher oft an besonders hohe Ansprüche gewöhnt ist, die geforderte langzeitstabile Zuverlässigkeit trotz wenig Aufwand zu bieten, sowie
- 8 bis 10,
- für Massenfertigung geeignete Maßnahmen zu bieten.
- 2,
- to achieve a particular robustness against unintentional damage to the fusion of the edge with the housing part,
- 3,
- to be able to manufacture the switch with particularly little effort,
- 4,
- to be able to manufacture the switch with very little effort, at least as long as the switching path of the switch does not have to have particularly low values when switched through,
- 5,
- Distance between the outer surface of the pressure body and the switching path of the switch, so that often the distance between the outer surface of the pressure body and a printed circuit, which can be attached inside the housing as a carrier of the circuit arrangement, can be increased accordingly,
- 6 and 7,
- in two applications, in which the end user is often used to particularly high demands, to offer the required long-term stability despite little effort, and
- 8 to 10,
- to offer suitable measures for mass production.
Die Erfindung und Weiterbildungen derselben werden anhand der in den beiden Figuren gezeigten Schemen von Ausführungsbeispielen der Erfindung weiter erläutert, welche der Übersichtlichkeit wegen jeweils möglichst einfach dargestellt wurden.The invention and further developments of the same are further explained on the basis of the diagrams of exemplary embodiments of the invention shown in the two figures, which have been shown as simply as possible for reasons of clarity.
Beide Figuren zeigen jeweils einen Abschnitt des Gehäuses G, das aus hartem thermoplastischen Kunststoff hergestellt oder zumindest unter anderem mit Hilfe von hartem thermoplastischen Kunststoff gebildet ist. Es kann sich hierbei z.B. um das Gehäuse eines für sich bekannten, auf Infrarotbasis oder Funkbasis arbeitenden Handsenders eines fernsteuerbaren KFZ-Zentralverriegelungssystemes handeln.Both figures each show a section of the housing G, which is made of hard thermoplastic or at least formed with the help of hard thermoplastic. It can e.g. are the housing of a handheld transmitter of a remotely controllable vehicle central locking system which is known and works on an infrared or radio basis.
Am gezeigten Gehäuseteil G ist ein, von außerhalb des Gehäuses G her zugänglicher Druckkörper D aus weichem thermoplastischen Kunststoff befestigt. Dieser Druckkörper D dient zum Betätigen von - im gezeigten Beispiel nur eines einzigen - im Gehäuseinneren I bereits angebrachten - oder erst später anzubringenden - elektrischen Schalters, vgl. den Schalter S in der Figur 1, der beispielhaft zusätzlich einen Tastenkörper T enthält, und vgl. den Schalter C/L in der Figur 2, der beispielhaft einerseits aus einem leitenden Belag C besteht, welcher an dem Fortsatz T also z.B. an einer Verdickung T hängt, der seinerseits einen Abschnitt des Druckkörpers D an dessen Innenoberfläche bildet, also seinerseits ebenfalls aus weichem thermoplastischen Kunststoff besteht, sowie aus den Endabschnitten von Leitungen L auf einer Leiterplatte A besteht, die im Inneren I des Gehäuses G angebracht ist.A pressure body D made of soft thermoplastic material and accessible from outside the housing G is fastened to the housing part G shown. This pressure element D is used to actuate - in the example shown only one single electrical switch which has already been fitted inside the housing I or which is to be fitted later, cf. the switch S in FIG. 1, which additionally contains a key body T as an example, and cf. the switch C / L in FIG. 2, which on the one hand consists of a conductive covering C, for example, depends on a thickening T, which in turn forms a section of the pressure body D on its inner surface, that is to say in turn also consists of soft thermoplastic material, and also consists of the end sections of lines L on a printed circuit board A which is attached to the interior I of the housing G.
Es würde sich aber auch dann um ein erfindungsgemäß gestaltetes Beispiel handeln, wenn der gezeigte Druckkörper D nicht nur einen einzigen, sondern mehrere Schalter S bzw. C/L zu betätigen gestatten würde.However, it would also be an example designed according to the invention if the pressure body D shown would allow not only one but several switches S or C / L to be actuated.
Um die im Gehäuse, vgl. G, anzubringende elektrische Schaltungsanordnung nachhaltig vor Schadstoffen, z.B. vor Feuchtigkeit, zu schützen, decken erfindungsgemäß die Ränder R des Druckkörpers D das für die Schalterbetätigung angebrachte Loch im Gehäuseteil G rundum wasserdicht und klebstofffrei in erfindungsgemäßer Weise ab. Das wird dadurch erreicht, daß diese Ränder R unmittelbar auf den Kunststoff des Gehäuseteils G so aufgespritzt sind, daß der weiche thermoplastische Kunststoff des Druckkörpers D und der harte thermoplastische Kunststoff des Gehäuseteils G auf den Kunststoff des Gehäuseteils G an ihren sich berührenden Grenzflächen miteinander unmittelbar wasserdicht verschmolzen sind. Durch dieses Aufspritzen, z.B. mittels einer Spritzgußmaschine, ist mit besonders wenig Aufwand die zuverlässige Dichtigkeit zwischen dem Gehäuse G und seinen Tasten D/S bzw. D/C/L erreicht, vor allem auch ohne dafür Klebstcff zwischen den Grenzflächen zu benötigen. Das erfindungsgemäß Prinzip ist vor allem für die Massenfertigung solcher Gehäuse G geeignet.For the in the housing, cf. G, to protect the electrical circuit arrangement to be attached sustainably from pollutants, for example from moisture, according to the invention the edges R of the pressure element D cover the hole made for the switch actuation in the housing part G in a completely waterproof and adhesive-free manner in the manner according to the invention. This is achieved in that these edges R are sprayed directly onto the plastic of the housing part G in such a way that the soft thermoplastic of the pressure body D and the hard thermoplastic plastic of the housing part G onto the plastic of the housing part G are fused together in a watertight manner at their contacting interfaces. By this spraying, for example by means of an injection molding machine, the reliable tightness between the housing G and its keys D / S or D / C / L is achieved with little effort, above all without the need for adhesive between the interfaces. The principle according to the invention is particularly suitable for the mass production of such housings G.
Die Härte des Gehäusekunststoffes gibt dem Gehäuse G nicht nur dann die erforderliche Steifheit und Festigkeit, wenn es sich um den Handsender eines KFZ-Schließsystemes, z.B. eines KFZ-Zentralverriegelungssystemes, handelt, also wenn dieses Gehäuse G in seinem Inneren I die besonders wasserempfindlichen bzw. feuchtigkeitsempfindlichen elektronischen Senderbauteile aufweist - vgl. den symbolisch dafür gezeigten Prozessor P, wobei dann das den Schalter enthaltende Tastengebilde D/S bzw. D/C/L zur Steuerung des Senders dient. Die Härte des Gehäusekunststoffes gibt dem Gehäuse G auch dann die oft sehr erwünschte Steifigkeit und Festigkeit, wenn das Gehäuse G andere Schaltungsanordnungen enthält, also z.B. den - unter anderem feuchtigkeitsempfindlichen - Bordcomputer des KFZ, oder wenn das - tragbare oder fest installierte - Gehäuse G auch beliebige sonstige Schaltungsanordnungen enthält.The hardness of the plastic housing not only gives the housing G the required rigidity and strength if it is the handheld transmitter of a motor vehicle locking system, e.g. of a motor vehicle central locking system, so if this housing G has the particularly water-sensitive or moisture-sensitive electronic transmitter components in its interior I - cf. the processor P shown symbolically therefor, the button structure D / S or D / C / L containing the switch then being used to control the transmitter. The hardness of the plastic housing gives the housing G the often very desirable rigidity and strength even if the housing G contains other circuit arrangements, e.g. the - among other things moisture-sensitive - on-board computer of the motor vehicle, or if the - portable or permanently installed - housing G also contains any other circuit arrangements.
Man kann bereits dann, wenn man, vgl. die Figur 1, die Ränder R des Druckkörpers D an der Außenoberfläche des Gehäuseteiles G befestigt, eine ziemliche Robustheit der Verbindung zwischen den Kunststoffen des Gehäuseteiles G und des Druckkörpers D erreichen. Wenn aber das fertige Gebilde G/D später mechanisch besonders stark strapaziert wird - z.B. wenn das Gebilde zum Handsender des KFZ-Schließsystemes gehört und dann z.B. der Schlüsselbund in der Tasche eines Autofahrers am Rand R kratzen könnte - , dann kann die Robustheit gegen unbeabsichtigtes Beschädigen der Verschmelzung des Randes R mit dem Gehäuseteil G auch dadurch weiter gesteigert werden, daß man den Druckkörper D so auf das Gehäuseteil G aufspritzt, daß die Ränder R an der Innenoberfläche des Gehäuseteiles G anliegen, vgl. die Figur 2.One can already, if one, cf. 1, the edges R of the pressure body D attached to the outer surface of the housing part G, achieve a fairly robust connection between the plastics of the housing part G and the pressure body D. However, if the finished structure G / D is later subjected to particularly high mechanical stresses - e.g. if the structure belongs to the hand-held transmitter of the motor vehicle locking system and the keychain in the pocket of a driver could scratch the edge R - then the robustness can prevent accidental damage the fusion of the edge R with the housing part G can also be further increased in that the pressure body D sprayed onto the housing part G so that the edges R abut the inner surface of the housing part G, cf. the figure 2.
Um auch Teile des Schalters, vgl. C/L in der Figur 2, zusammen mit dem Druckkörper D mit besonders wenig Aufwand herstellen zu können, kann der Druckkörper D zumindest mehr oder weniger in der Mitte seiner Innenoberfläche einen leitenden Belag C als eine Kontaktfläche des Schalters S aufweisen. Dieser Belag C kann z.B. aus Metall oder aus eine silberhaltigen Graphitmasse bestehen und einen mehr oder weniger großen Abschnitte der Innenoberfläche des Druckkörpers D bedecken. Dieser Belag C befindet sich an einer solchen Stelle, daß dann, wenn der Endverbraucher den Druckkörper D drückt, die beiden Leitungen L, die z.B. gemäß der Figur 2 auf einer Leiterplatte A angebracht sind, durch den leitenden Belag C überbrückt werden und damit die Schaltstrecke dieses Schalters C/L leitend wird.To include parts of the switch, cf. C / L in FIG. 2, in order to be able to produce it together with the pressure element D with particularly little effort, the pressure element D can have a conductive coating C as a contact surface of the switch S at least more or less in the middle of its inner surface. This covering C can e.g. consist of metal or a silver-containing graphite mass and cover a more or less large section of the inner surface of the pressure body D. This covering C is located at a point such that when the end user presses the pressure body D, the two lines L, e.g. 2 are mounted on a printed circuit board A, are bridged by the conductive coating C and thus the switching path of this switch C / L is conductive.
Um den Schalter C/L, vgl. die Figur 2, zusammen mit dem Druckkörper D mit ganz besonders wenig Aufwand herstellen zu können, jedenfalls solange die Schaltstrecke des Schalters C/L im durchgeschalteten Zustand nicht besonders niedrige Werte aufweisen muß, kann man für den Druckkörper D einen weichen thermoplastischen Kunststoff verwenden, der selbst ausreichend elektrisch leitend ist, oder der durch Beimischungen genügend elektrisch leitfähig gemacht wurde. Dann braucht man keinen leitenden Belag C mehr anzubringen, vgl. die Figur 2.To the switch C / L, cf. the figure 2, together with the pressure body D can be produced with very little effort, at least as long as the switching distance of the switch C / L does not have to have particularly low values in the switched state, you can use a soft thermoplastic for the pressure body D, the itself is sufficiently electrically conductive or has been made sufficiently electrically conductive by admixtures. Then it is no longer necessary to apply a conductive covering C, cf. the figure 2.
Um den Abstand zwischen der Außenoberfläche des Druckkörpers D einerseits und dem Schalter C/L bzw. S andererseits entsprechend vergrößern zu können, kann der Druckkörper D mehr oder weniger in der Mitte seiner Innenoberfläche einen zum Schalter C/L, S hin gerichteten Fortsatz T bzw. Verdickung T aufweisen, vgl. die Figur 2. So kann ein eigener zusätzlicher Abstandskörper T bzw. Tastenkörper T, vgl. die Figur 1, oft entfallen. Damit kann oft auch den Abstand zwischen der Außenoberfläche des Druckkörpers D und einer Leiterplatte A, die im Gehäuseinneren I als Träger der Schaltungsanordnung, vgl. P, angebracht werden kann, entsprechend vergrößert werden.In order to be able to correspondingly increase the distance between the outer surface of the pressure body D on the one hand and the switch C / L or S on the other hand, the pressure body D can more or less in the middle of its inner surface an extension T or towards the switch C / L, S Have thickening T, cf. FIG. 2. A separate additional spacer T or key body T, cf. the figure 1, often omitted. This can often also be the distance between the outer surface of the pressure body D and a circuit board A, which is inside the housing I as a carrier of the circuit arrangement, cf. P, can be attached, enlarged accordingly.
Es gibt zwei Anwendungsfälle, in denen die Erfindung mit besonderem Vorteil benutzt werden kann. In beiden Fällen ist der Endverbraucher oft an besonders hohe Ansprüche gewöhnt fordert mit besonders großer Selbstverständlichkeit die langzeitstabile Zuverlässigkeit. Diese Forderung kann man mit wenig Aufwand erfindungsgemäß erfüllen, besonders wenn die im Gehäuse G angebrachte Schaltungsanordnung, vgl. P, die Elektronik in der durch den Druckkörper D aktivierbare feuchtigkeitsempfindliche Handsender eines ferngesteuerten KFZ-Schließsystemes ist, oder wenn diese im Gehäuse G angebrachte Schaltungsanordnung P die besonders feuchtigkeitserrpfindliche Elektronik eines KFZ-Bordcomputers ist.There are two applications in which the invention can be used with particular advantage. In both cases, the end user is often used to particularly high demands and demands the long-term stable reliability. This requirement can be met with little effort according to the invention, especially if the circuit arrangement in the housing G, cf. P, the electronics in the moisture-sensitive hand-held transmitter of a remote-controlled motor vehicle locking system that can be activated by the pressure element D, or if this circuit arrangement P attached in the housing G is the particularly moisture-sensitive electronics of an on-board vehicle computer.
Um die Erfindung in Massenfertigung herzustellen, kann das Gehäuseteil G von einem der Form des Gehäuses G entsprechenden Haltekörper in dem Moment gehalten werden, während der Druckkörper D durch eine Spritzgußmaschine angespritzt wird. Dabei kann das Gehäuseteil G z.B. als vorgefertigter Körper von dem Haltekörper gehalten werden. Es kann aber z.B. auch das Gehäuseteil G und der Druckkörper D mittels eines Werkzeugkörpers, der je ein eigenes Formnest für das Gehäuseteil G und für den Druckkörper D aufweist, durch mehr oder weniger gleichzeitiges Spritzen beider Teile G und D hergestellt werden. Dann stellt das für das Gehäuseteil G bestimmte Formnest gleichzeitig sozusagen den Haltekörper für dieses Gehäuseteil G dar.In order to mass-produce the invention, the housing part G can be held by a holding body corresponding to the shape of the housing G at the moment when the pressure body D is injection molded by an injection molding machine. The housing part G can e.g. be held as a prefabricated body by the holding body. However, e.g. the housing part G and the pressure body D can also be produced by means of a tool body, each with its own mold cavity for the housing part G and for the pressure body D, by more or less simultaneous injection molding of both parts G and D. Then the mold cavity intended for the housing part G simultaneously represents, so to speak, the holding body for this housing part G.
Die Erfindung hat also auch den Vorteil, ganz unterschiedliche Verfahren zu ihrer Herstellung zuzulassen, so daß die Herstellung entsprechend leicht an die in den Werkstätten jeweils vorliegenden Verhältnisse angepaßt werden kann.The invention therefore also has the advantage of permitting very different processes for their production, so that the production can be easily adapted to the conditions prevailing in the workshops.
Claims (10)
- Housing section (G) made of hard thermoplastic material for an electrical circuit to be protected from pollutants, e.g. a motor vehicle locking system, with at least one pressure member (D) accessible from outside the housing, each of which serves to operate at least one electrical switch (S, C/L) fitted or to be fitted inside (I) the housing, characterized in that edges (R) of the pressure member (D) made of soft thermoplatic material provide an all-round water-tight and adhesive-free cover for a hole in the housing section (G) in that the edges (R) are directly injection molded onto the plastic of the housing section (G) in such a way that the plastic of the pressure member (D) and the plastic of the housing section (G) are fused together.
- Housing section (G) according to Patent Claim 1, characterized in that the edges (R) lie against the inner surface of the housing section (G).
- Housing section (G) according to Patent Claim 1 or 2, characterized in that the pressure member (D) has, more or less in the centre of its inner surface, a conductive coating (C) as a contact surface of the switch (S).
- Housing section (G) according to Patent Claim 1 or 2, characterized in that the pressure member (D) is itself made of conductive material.
- Housing section (G) according to Patent Claim 3 or 4, characterized in that the pressure member (D) has, more or less in the centre of its inner surface, a protrusion (T) or enlargement (T) facing the switch (S, L).
- Housing section (G) according to one of the preceding patent claims, characterized in that the circuit (P) is the moisture-sensitive hand transmitter of a remote-controlled motor vehicle locking system which can be activated by the pressure member (D).
- Housing section (G) according to one of Patent Claims 1 to 5, characterized in that the circuit (P) is the moisture-sensitive electronics of a motor vehicle on-board computer.
- Process for producing a housing with a housing section (G) according to one of the preceding patent claims, characterized in that the housing section (G) is held by a holding member whilst the pressure member (D) is injected on by means of an injection molding machine.
- Process according to Patent Claim 8, characterized in that the housing section (G), as a prefabricated element, is held by the holding member.
- Process according to Patent Claim 8, characterized in that the housing section (G) and the pressure member (D) are produced simultaneously by injection molding by means of a mold body which has in each case a separate mold cavity for the housing section (G) and for the pressure member (D).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4128778A DE4128778A1 (en) | 1991-08-29 | 1991-08-29 | HOUSING PART FOR AN ELECTRICAL CIRCUIT ARRANGEMENT TO BE PROTECTED FROM POLLUTANTS e.g. A VEHICLE LOCKING SYSTEM |
| DE4128778 | 1991-08-29 | ||
| PCT/DE1992/000681 WO1993005526A1 (en) | 1991-08-29 | 1992-08-13 | Housing section for an electric circuit to be protected from pollutants, e.g. a motor vehicle locking system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0600943A1 EP0600943A1 (en) | 1994-06-15 |
| EP0600943B1 true EP0600943B1 (en) | 1995-04-19 |
Family
ID=6439456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92916952A Expired - Lifetime EP0600943B1 (en) | 1991-08-29 | 1992-08-13 | Housing section for an electric circuit to be protected from pollutants, e.g. a motor vehicle locking system |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5489754A (en) |
| EP (1) | EP0600943B1 (en) |
| DE (2) | DE4128778A1 (en) |
| WO (1) | WO1993005526A1 (en) |
Cited By (2)
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|---|---|---|---|---|
| DE19700848C1 (en) * | 1997-01-13 | 1998-04-16 | Siemens Ag | Electrical switching device e.g. for motor vehicle anti-theft device |
| DE19700846C1 (en) * | 1997-01-13 | 1998-04-23 | Siemens Ag | Electrical switching device for connections on printed circuit board |
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| DE19533427C1 (en) * | 1995-09-11 | 1996-12-05 | Kostal Leopold Gmbh & Co Kg | Electrical switching unit used e.g. in remote controls |
| DE19605201B4 (en) * | 1996-02-13 | 2007-04-12 | Marquardt Gmbh | Housing for an electronic key |
| US5734138A (en) * | 1996-10-31 | 1998-03-31 | The Whitaker Corporation | Fully encapsulated switch assembly including nonconductive elastomeric material interposed between normally open contacts |
| JPH10250093A (en) * | 1997-03-11 | 1998-09-22 | Brother Ind Ltd | Ink cartridge loader |
| DE19715536C2 (en) * | 1997-04-14 | 2000-02-17 | Itt Mfg Enterprises Inc | Handle housing with built-in switch and process for its manufacture |
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| FI105504B (en) * | 1998-12-28 | 2000-08-31 | Nokia Mobile Phones Ltd | New push button design for user interface of electronic device |
| DE19961246A1 (en) * | 1999-05-18 | 2001-06-21 | Huf Huelsbeck & Fuerst Gmbh | Device for setting an opening and / or closing aid for lockable parts on vehicles, such as flaps, doors or the like. |
| EP1054420A1 (en) * | 1999-05-18 | 2000-11-22 | Molex Incorporated | Keyboard for an electrical or electronic apparatus and method of making the same |
| DE10027357C2 (en) * | 2000-06-02 | 2003-04-17 | Tyco Electronics Gmbh Wien | Relay with manual control and button |
| JP3419388B2 (en) | 2000-07-17 | 2003-06-23 | 日本電気株式会社 | Electronic device with operation key and method of manufacturing the same |
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| DE10214025B4 (en) * | 2002-03-27 | 2004-04-15 | Huf Hülsbeck & Fürst Gmbh & Co. Kg | Method and device for producing a sealed closing element, in particular an electronic key for motor vehicles |
| DE102004004136B4 (en) * | 2004-01-28 | 2006-04-20 | Braun Gmbh | Small electrical appliance with a switching device |
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| CN101465224B (en) * | 2007-12-21 | 2012-06-13 | 深圳富泰宏精密工业有限公司 | Key-press structure |
| JP5913873B2 (en) * | 2011-09-06 | 2016-04-27 | オムロン株式会社 | Trigger switch |
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-
1991
- 1991-08-29 DE DE4128778A patent/DE4128778A1/en not_active Withdrawn
-
1992
- 1992-08-13 WO PCT/DE1992/000681 patent/WO1993005526A1/en active IP Right Grant
- 1992-08-13 EP EP92916952A patent/EP0600943B1/en not_active Expired - Lifetime
- 1992-08-13 DE DE59201985T patent/DE59201985D1/en not_active Expired - Fee Related
-
1994
- 1994-02-18 US US08/198,622 patent/US5489754A/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19700848C1 (en) * | 1997-01-13 | 1998-04-16 | Siemens Ag | Electrical switching device e.g. for motor vehicle anti-theft device |
| DE19700846C1 (en) * | 1997-01-13 | 1998-04-23 | Siemens Ag | Electrical switching device for connections on printed circuit board |
Also Published As
| Publication number | Publication date |
|---|---|
| DE59201985D1 (en) | 1995-05-24 |
| WO1993005526A1 (en) | 1993-03-18 |
| US5489754A (en) | 1996-02-06 |
| DE4128778A1 (en) | 1993-03-04 |
| EP0600943A1 (en) | 1994-06-15 |
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