EP0632547B1 - Contact device for the contact of an electric bulb of a motor vehicle - Google Patents
Contact device for the contact of an electric bulb of a motor vehicle Download PDFInfo
- Publication number
- EP0632547B1 EP0632547B1 EP94401462A EP94401462A EP0632547B1 EP 0632547 B1 EP0632547 B1 EP 0632547B1 EP 94401462 A EP94401462 A EP 94401462A EP 94401462 A EP94401462 A EP 94401462A EP 0632547 B1 EP0632547 B1 EP 0632547B1
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- EP
- European Patent Office
- Prior art keywords
- contact
- block
- contact device
- zone
- lamp
- 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.)
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R33/00—Coupling devices specially adapted for supporting apparatus and having one part acting as a holder providing support and electrical connection via a counterpart which is structurally associated with the apparatus, e.g. lamp holders; Separate parts thereof
- H01R33/05—Two-pole devices
- H01R33/46—Two-pole devices for bayonet type base
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/19—Attachment of light sources or lamp holders
- F21S41/192—Details of lamp holders, terminals or connectors
Definitions
- the present invention relates to an electrical contact device for a lamp base for a vehicle signal light, in particular for a motor vehicle, as well as a lamp holder using this contact device and a signal block incorporating it.
- a lamp for a vehicle headlight in particular a motor vehicle, generally comprises a bulb, the base of which engages in a socket defined in a lamp holder.
- the filament is connected to two electrical contacts, located at the level of a cylindrical body of the base and of a contact pad located at the rear of the base, which cooperate with electrical contacts located in the socket.
- the contact pad generally of partially hemispherical shape, is produced by depositing a soft metal pad, for example brass, on an insulating part, the conductor connected to the filament being embedded therein.
- the electrical contact located in the socket which cooperates with the contact pad of the base, is produced by means of an elastically deformable conductive strip, of planar shape.
- the conductive strip is tangent to the contact pad and therefore the electrical contact thus produced is an essentially single point contact.
- vibrations are transmitted by this vehicle to the lamp holder which equips it, and therefore to the blade.
- the base of the bulb is of the bayonet type, fixed by means of lugs which engage in notches in the general "J" shape of the socket, these vibrations cause displacements of the bulb in particular by pivoting around an axis passing through the lugs of the bayonet mount, and repeated and rapid friction of the contact pad relative to the blade.
- These frictions cause a deterioration in the quality of the contact between the blade and the stud, arcing and oxidation phenomena by raising the temperature.
- an elastic socket contact having at the level of the lamp stud a hollow spherical zone of the same radius as the stud, so as to obtain a generally surface contact and a setting of the stud.
- the present invention aims to overcome these drawbacks by proposing an electrical contact device for a lamp base for a vehicle headlamp, in particular for a motor vehicle, which makes it possible to improve the contact and the resistance between the stud of a lamp base and a blade.
- conductive and elastically deformable of a socket by avoiding dimensional variations of the stud.
- Another object of the invention is to propose a contact device for a lamp base for a vehicle headlamp, in particular a motor vehicle, which stabilizes the position of the lamp and which in particular prevents rotation of the lamp around an axis passing through the lugs for fixing the base in a lamp socket.
- the present invention relates to an electrical contact device for a lamp base for vehicle, in particular a motor vehicle, comprising a conductive strip in contact with a conductive contact pad located on a base of a bulb, characterized in that the conductive part comprises, at the stud level, a hollow contact area partially receiving the contact pad and ensuring electrical contact and maintaining the stud in the lateral direction by at least two edge regions of the stud distant from each other, no contact taking place in the central region of said stud.
- the invention also relates to a lamp holder for motor vehicle, defining at least one socket, characterized in that the or each socket is equipped with a contact device as defined above, as well as a signaling light for an industrial motor vehicle, characterized in that is equipped with such a lamp holder.
- the electrical contact device comprises a conductive part, consisting of an elastically deformable metal strip 1, intended to supply current to the filament of a bayonet type mounting bulb via a contact pad 2 located on an insulating part 21, at a rear end of a base 3 of this bulb.
- This base 3 includes lugs 4 intended to engage, during the establishment of the bulb, in notches in the general shape of "J" defined by a socket formed in a lamp holder (not shown).
- the metal strip 1 comprises, at the level of the zone in contact with the contact pad 2, a contact zone 5 in the form of a hollow profile, defined in this case by two flat parts forming between them an obtuse angle for example of 1 '' order of 150 °.
- an electrical connection in two essentially point regions 51 and 52 is made.
- the longitudinal direction of the profile 5 is parallel to the axis passing through the lugs 4, which constitutes a privileged pivot axis of the bulb when it is exposed to vibrations.
- the hollow profile 5 applied elastically against the stud exerts resistance vis-à-vis the movements of the bulb, and therefore stabilizes the position thereof to guarantee improved electrical contact.
- the transverse width of the profile 5 is less than the width in the same direction of the contact pad.
- the contact regions 51 and 52 are located at the edges of the profile, and given the relatively malleable nature of the metal constituting the stud 2, a mutual anchoring is additionally obtained, by plastic deformation of said metal, of the stud and of the contact part 5.
- the fact of giving the section 5 a width less than the width of the stud allows, when the stud is very slightly protruding (it will be noted here that there is a significant dispersion in the shape and convexity of the studs from one bulb to another), to ensure that electrical contact is established. Indeed, if profile 5 was wider than the stud, it would risk being based only on insulating regions of the base surrounding the stud.
- junction line of the two half-planes of the profile 5 being parallel to the axis passing through the pins 4, even when the bulb rotates around the axis defined by the pins 4, one of the edges of the tile always remains in contact with the stud, and therefore an electrical connection is always ensured.
- FIG. 3 The rest position of the contact blade 1, in the absence of a bulb, is illustrated in FIG. 3. It is capable of pivoting about an axis A. It is understood that, when the bulb is in place, the force exerted by the profiled contact zone 5 on the base is essentially axial.
- the profiled contact zone 5 can have a generally curved profile, preferably in the form of an arc of a circle, with a radius of curvature less than a minimum radius of curvature of the stud, to ensure a double contact as described above, and with a profile width even less than the width of the stud.
- the recessed contact area consists of a convex recess 6, preferably of spherical shape. Its radius of curvature is chosen to be less than a minimum radius of curvature of the stud 2.
- the contact region between the blade 1 and the stud 2 is generally circular. It can be seen in FIG. 4 that the recess 6 is bordered by a sharp edge, which can initiate a plastic deformation of the malleable material of the stud and therefore cause the beginning of anchoring which further improves the stabilization of the position of the bulb in vibration or shock.
- the recessed contact area is defined by a circular orifice 7 with fallen edges, the internal diameter of which is less than the diameter of the stud 2.
- the periphery of the orifice, rounded, is in contact with the stud 2 in a generally circular contact region.
- the electrical contact device can also comprise a blade 8 cooperating with several sockets and provided with a recessed contact area, produced according to one or the other of the modes described above, at each socket.
- a blade 8 allows a parallel supply of several bulbs. This blade 8 is at rest in the position indicated in dashes indicated in 81; when the base 3 is engaged in the socket, it is placed in the solid lines indicated at 82, by exerting an axial force which, in the same manner as described above, stabilizes the lamp both axially and laterally.
- the technique for producing the stud is such that its radius of curvature can vary significantly from one bulb to another.
- the shape and the dimensions of the hollow contact area of the blade are chosen in such a way that, whatever the variations in the shape of the stud, contact is generally ensured. non-surface between the blade and the stud, so as to maintain a contact force per unit of surface area.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
- Securing Globes, Refractors, Reflectors Or The Like (AREA)
- Coupling Device And Connection With Printed Circuit (AREA)
- Arrangements Of Lighting Devices For Vehicle Interiors, Mounting And Supporting Thereof, Circuits Therefore (AREA)
Abstract
Description
La présente invention concerne un dispositif de contact électrique pour culot de lampe pour feu de signalisation de véhicule en particulier automobile, ainsi qu'un porte-lampe utilisant ce dispositif de contact et un bloc de signalisation l'incorporant.The present invention relates to an electrical contact device for a lamp base for a vehicle signal light, in particular for a motor vehicle, as well as a lamp holder using this contact device and a signal block incorporating it.
Une lampe pour projecteur de véhicule en particulier automobile comprend généralement une ampoule dont le culot s'engage dans une douille définie dans un porte-lampes. Le filament est relié à deux contacts électriques, situés au niveau d'un corps cylindrique du culot et d'un plot de contact situé à l'arrière du culot, qui coopèrent avec des contacts électriques situés dans la douille. Le plot de contact, généralement de forme partiellement hémisphérique, est réalisé en déposant une pastille de métal mou, par exemple du laiton, sur une partie isolante, le conducteur relié au filament y étant noyé.A lamp for a vehicle headlight, in particular a motor vehicle, generally comprises a bulb, the base of which engages in a socket defined in a lamp holder. The filament is connected to two electrical contacts, located at the level of a cylindrical body of the base and of a contact pad located at the rear of the base, which cooperate with electrical contacts located in the socket. The contact pad, generally of partially hemispherical shape, is produced by depositing a soft metal pad, for example brass, on an insulating part, the conductor connected to the filament being embedded therein.
Classiquement, le contact électrique situé dans la douille, qui coopère avec le plot de contact du culot, est réalisé au moyen d'une lame conductrice élastiquement déformable, de forme plane. Cependant, de par sa structure, la lame conductrice est tangente au plot de contact et donc le contact électrique ainsi réalisé est un contact essentiellement ponctuel unique.Conventionally, the electrical contact located in the socket, which cooperates with the contact pad of the base, is produced by means of an elastically deformable conductive strip, of planar shape. However, due to its structure, the conductive strip is tangent to the contact pad and therefore the electrical contact thus produced is an essentially single point contact.
D'autre part, particulièrement en ce qui concerne des véhicules industriels qui sont utilisés dans des conditions sévères, des vibrations sont transmises par ce véhicule au porte-lampes qui l'équipe, et donc à la lame . En particulier dans le cas où le culot de l'ampoule est de type à baïonnette, fixé au moyen d'ergots qui s'engagent dans des encoches en forme générale de "J" de la douille, ces vibrations entraînent des déplacements de l'ampoule notamment par pivotement autour d'un axe passant par les ergots du montage à baïonette, et des frottements répétés et rapides du plot de contact par rapport à la lame. Ces frottements provoquent une détérioration de la qualité du contact entre le lame et le plot, des phénomènes d'arcs et d'oxydation par élévation de la température.On the other hand, particularly with regard to industrial vehicles which are used under severe conditions, vibrations are transmitted by this vehicle to the lamp holder which equips it, and therefore to the blade. In particular in the case where the base of the bulb is of the bayonet type, fixed by means of lugs which engage in notches in the general "J" shape of the socket, these vibrations cause displacements of the bulb in particular by pivoting around an axis passing through the lugs of the bayonet mount, and repeated and rapid friction of the contact pad relative to the blade. These frictions cause a deterioration in the quality of the contact between the blade and the stud, arcing and oxidation phenomena by raising the temperature.
Le filament ne travaille donc plus dans des conditions régulières, ce qui réduit considérablement la durée de vie de l'ampoule.The filament therefore no longer works under regular conditions, which considerably reduces the life of the bulb.
On connaît également, notamment par DE-B-11 17 748, GB-A-1 436 944, DE-A-22 47 713 et DE-B-11 02 280 un contact élastique de douille présentant au niveau du plot de la lampe une zone sphérique en creux de même rayon que le plot, de manière à obtenir un contact généralement surfacique et un calage du plot.Also known, in particular from DE-B-11 17 748, GB-A-1 436 944, DE-A-22 47 713 and DE-B-11 02 280, an elastic socket contact having at the level of the lamp stud a hollow spherical zone of the same radius as the stud, so as to obtain a generally surface contact and a setting of the stud.
Cependant, il est fréquent que le rayon et la taille du plot varient considérablement d'une lampe à l'autre, si bien que le contact élastique et/ou le calage n'est pas assuré convenablement.However, it is frequent that the radius and the size of the stud vary considerably from one lamp to another, so that the elastic contact and / or the setting is not adequately ensured.
La présente invention vise à pallier ces inconvénients, en proposant un dispositif de contact électrique pour culot de lampe pour projecteur de véhicule en particulier automobile, qui permette d'améliorer le contact et la tenue entre le plot d'un culot de lampe et une lame conductrice et élastiquement déformable d'une douille, en s'affranchissant des variations dimensionnelles du plot.The present invention aims to overcome these drawbacks by proposing an electrical contact device for a lamp base for a vehicle headlamp, in particular for a motor vehicle, which makes it possible to improve the contact and the resistance between the stud of a lamp base and a blade. conductive and elastically deformable of a socket, by avoiding dimensional variations of the stud.
Un autre but de l'invention est de proposer un dispositif de contact pour culot de lampe pour projecteur de véhicule en particulier automobile qui assure une stabilisation de la position de la lampe et qui notamment s'oppose à une rotation de la lampe autour d'un axe passant par les ergots de fixation du culot dans une douille de lampe.Another object of the invention is to propose a contact device for a lamp base for a vehicle headlamp, in particular a motor vehicle, which stabilizes the position of the lamp and which in particular prevents rotation of the lamp around an axis passing through the lugs for fixing the base in a lamp socket.
A cet effet, la présente invention a pour objet un dispositif de contact électrique pour culot de lampe pour véhicule en particulier automobile, comportant une lame conductrice en contact avec un plot de contact conducteur situé sur un culot d'une ampoule, caractérisé en ce que la partie conductrice comporte au niveau du plot une zone de contact en creux recevant partiellement le plot de contact et assurant un contact électrique et un maintien du plot en direction latérale par au moins deux régions de bord du plot distantes l'une de l'autre, aucun contact n'ayant lieu dans la région centrale dudit plot.To this end, the present invention relates to an electrical contact device for a lamp base for vehicle, in particular a motor vehicle, comprising a conductive strip in contact with a conductive contact pad located on a base of a bulb, characterized in that the conductive part comprises, at the stud level, a hollow contact area partially receiving the contact pad and ensuring electrical contact and maintaining the stud in the lateral direction by at least two edge regions of the stud distant from each other, no contact taking place in the central region of said stud.
Certains aspects préférés, mais non limitatifs, du dispositif de contact selon l'invention sont les suivants :
- dans le cas d'une lampe possédant des moyens de montage de type à baïonette, la zone de contact en creux présente une forme profilée en creux dont la direction longitudinale est essentiellement parallèle à un axe passant par deux ergots desdits moyens de montage.
- la largeur transversale de la zone de contact profilée est inférieure à la largeur du plot dans la même direction.
- la zone de contact profilée présente un profil en forme générale de "V", ou en forme générale d'arc de cercle.
- dans ce dernier cas, le rayon de courbure de la zone de contact profilée est inférieur à un rayon de courbure minimal du plot.
- la zone de contact en creux présente la forme d'un renfoncement de contour généralement circulaire. Ce renfoncement peut être de forme sphérique, avec un rayon de courbure inférieur à un rayon de courbure minimal du plot de contact.
- la zone de contact en creux est définie par un orifice de taille inférieure à celle du plot de contact. Cet orifice peut être circulaire et présenter des bords tombés.
- in the case of a lamp having bayonet type mounting means, the recessed contact area has a hollow profiled shape whose longitudinal direction is essentially parallel to an axis passing through two lugs of said mounting means.
- the transverse width of the profiled contact area is less than the width of the stud in the same direction.
- the profiled contact zone has a profile in the general shape of a "V", or in the general shape of an arc of a circle.
- in the latter case, the radius of curvature of the profiled contact zone is less than a minimum radius of curvature of the stud.
- the recessed contact area has the shape of a generally circular contour recess. This recess can be spherical, with a radius of curvature less than a minimum radius of curvature of the contact pad.
- the recessed contact area is defined by an orifice of size smaller than that of the contact pad. This orifice can be circular and have fallen edges.
L'invention concerne également un porte-lampe pour véhicule automobile, définissant au moins une douille, caractérisé en ce que la ou chaque douille est équipée d'un dispositif de contact tel que défini ci-dessus, ainsi qu'un feu de signalisation pour véhicule automobile industriel, caractérisé en ce qu'il est équipé d'un tel porte-lampe.The invention also relates to a lamp holder for motor vehicle, defining at least one socket, characterized in that the or each socket is equipped with a contact device as defined above, as well as a signaling light for an industrial motor vehicle, characterized in that is equipped with such a lamp holder.
D'autres caractéristiques, buts et avantages ressortiront de la description suivante, donnée à titre d'exemple et sans caractère limitatif, en regard des dessins annexés, sur lesquels :
- les figures 1 et 2 sont des vues schématiques en coupe, suivant deux plans perpendiculaires, d'un culot de lampe de type baïonnette alimenté au moyen d'un dispositif de contact électrique présentant une zone de contact en forme de profilé en creux, la figure 2 étant une vue partielle,
- la figure 3 est une vue en coupe du dispositif de contact représenté sur les figures 1 et 2, au repos et en l'absence de lampe,
- la figure 4 est une vue schématique en coupe du culot représenté sur la figure 1 alimenté par un dispositif de contact électrique présentant une zone de contact en creux de forme sphérique,
- la figure 5 est une vue schématique en coupe du culot représenté sur la figure 1 alimenté par un dispositif de contact électrique présentant une zone en creux constituée d'un orifice, et
- la figure 6 est une vue schématique en coupe du culot représenté sur la figure 1, équipé d'un dispositif de contact possédant une zone de contact semblable à celle de la figure 4 mais permettant l'alimentation en série de plusieurs ampoules.
- Figures 1 and 2 are schematic sectional views, along two perpendicular planes, of a bayonet-type lamp base supplied by means of an electrical contact device having a contact area in the form of a hollow profile, Figure 2 being a partial view,
- FIG. 3 is a sectional view of the contact device shown in FIGS. 1 and 2, at rest and in the absence of a lamp,
- FIG. 4 is a schematic sectional view of the base represented in FIG. 1 supplied by an electrical contact device having a hollow contact zone of spherical shape,
- FIG. 5 is a schematic sectional view of the base represented in FIG. 1 supplied by an electrical contact device having a hollow zone consisting of an orifice, and
- Figure 6 is a schematic sectional view of the base shown in Figure 1, equipped with a contact device having a contact area similar to that of Figure 4 but allowing the series supply of several bulbs.
En référence aux figures 1 et 2, le dispositif de contact électrique comprend une partie conductrice, constituée d'une lame métallique 1 élastiquement déformable, destinée à alimenter en courant le filament d'une ampoule à montage de type baïonnette par l'intermédiaire d'un plot de contact 2 situé sur un partie isolante 21, à une extrémité postérieure d'un culot 3 de cette ampoule. Ce culot 3, comprend des ergots 4 destinés à s'engager, lors de la mise en place de l'ampoule, dans des encoches en forme générale de "J" définies par une douille formée dans un porte-lampe (non représenté). La lame métallique 1 comporte, au niveau de la zone en contact avec le plot de contact 2, une zone de contact 5 en forme de profilé creux, définie en l'espèce par deux parties planes formant entre elles un angle obtus par exemple de l'ordre de 150°. Ainsi, une connexion électrique en deux régions essentiellement ponctuelles 51 et 52 est effectuée.Referring to Figures 1 and 2, the electrical contact device comprises a conductive part, consisting of an elastically
En outre, la direction longitudinale du profilé 5 est parallèle à l'axe passant par les ergots 4, qui constitue un axe de pivotement privilégié de l'ampoule lorsqu'elle est exposée à des vibrations. De cette manière, le profilé en creux 5 appliqué élastiquement contre le plot exerce une résistance vis-à-vis des mouvements de l'ampoule, et stabilise donc la position de celle-ci pour garantir un contact électrique amélioré.In addition, the longitudinal direction of the
Avantageusement et comme illustré, la largeur transversale du profilé 5 est inférieure à la largeur selon la même direction du plot de contact. De la sorte, les régions de contact 51 et 52 se trouvent au niveau des arêtes du profilé, et étant donné la nature relativement malléable du métal constituant le plot 2, on obtient additionnellement un ancrage mutuel, par déformation plastique dudit métal, du plot et de la partie de contact 5. En outre, le fait de donner au profilé 5 une largeur inférieure à la largeur du plot permet, lorsque le plot est très peu saillant (on notera ici qu'il existe une dispersion importante dans la forme et la convexité des plots d'une ampoule à l'autre), de garantir que le contact électrique soit établi. En effet, si le profilé 5 était plus large que le plot, il risquerait de s'appuyer seulement sur des régions isolantes du culot entourant le plot.Advantageously and as illustrated, the transverse width of the
Par ailleurs, la ligne de jonction des deux demi-plans du profilé 5 étant parallèle à l'axe passant par les ergots 4, même lorsque l'ampoule tourne autour de l'axe défini par les ergots 4, l'un des bords de la tuile demeure toujours en contact avec le plot, et donc une connexion électrique est toujours assurée.Furthermore, the junction line of the two half-planes of the
La position au repos de la lame de contact 1, en l'absence d'ampoule, est illustrée sur la figure 3. Elle est capable de pivoter autour d'un axe A. On comprend que, lorsque l'ampoule est en place, l'effort exercé par la zone de contact profilée 5 sur le culot est essentiellement axial.The rest position of the
Selon une variante de réalisation, non illustrée, la zone de contact profilée 5 peut présenter un profil généralement courbe, de préférence en forme d'arc de cercle, avec un rayon de courbure inférieur à un rayon de courbure miminum du plot, pour assurer un double contact comme décrit plus haut, et avec une largeur de profilé encore inférieure à la largeur du plot.According to an alternative embodiment, not illustrated, the profiled
Selon un autre mode de réalisation, illustré sur la figure 4, la zone de contact en creux est constituée d'un renfoncement convexe 6, de forme préférentiellement sphérique. Son rayon de courbure est choisi inférieur à un rayon de courbure minimal du plot 2. Dans ce cas, la région de contact entre la lame 1 et le plot 2 est généralement circulaire. On observe sur la figure 4 que le renfoncement 6 est bordé par une arête vive, qui peut entamer une déformation plastique de la matière malléable du plot et donc provoquer un début d'ancrage qui améliore encore la stabilisation de la position de l'ampoule en cas de vibrations ou chocs.According to another embodiment, illustrated in FIG. 4, the recessed contact area consists of a
Selon un autre exemple de réalisation, illustré sur la figure 5, la zone de contact en creux est définie par un orifice circulaire 7 à bords tombés, dont le diamètre intérieur est inférieur au diamètre du plot 2. Ainsi, le pourtour de l'orifice, arrondi, est en contact avec le plot 2 selon une région de contact généralement circulaire.According to another exemplary embodiment, illustrated on the FIG. 5, the recessed contact area is defined by a
En se référant à la figure 6, le dispositif de contact électrique peut également comporter une lame 8 coopérant avec plusieurs douilles et munie d'une zone de contact en creux, réalisée selon l'un ou l'autre des modes décrits ci-dessus, au niveau de chaque douille. Une telle lame 8 permet de réaliser une alimentation en parallèle de plusieurs ampoules. Cette lame 8, est au repos dan la position indiquée en tiretés indiquée en 81; lorsque le culot 3 est engagé dans la douille, elle se place dans la en traits pleins indiquée en 82, en exerçant une force axiale qui, de la même manière que décrit plus haut, stabilise la lampe à la fois axialement et latéralement.Referring to FIG. 6, the electrical contact device can also comprise a
Comme on l'a indiqué, la technique de réalisation du plot est telle que son rayon de courbure peut varier sensiblement d'une ampoule à l'autre. Dans tous les modes de réalisation décrits ci-dessus, la forme et les dimensions de la zone de contact en creux de la lame sont choisies de telle manière que, quelles que soient les variations de la forme du plot, on assure toujours un contact généralement non surfacique entre la lame et le plot, de manière à maintenir un effort de contact par unité de surface élevé.As indicated, the technique for producing the stud is such that its radius of curvature can vary significantly from one bulb to another. In all the embodiments described above, the shape and the dimensions of the hollow contact area of the blade are chosen in such a way that, whatever the variations in the shape of the stud, contact is generally ensured. non-surface between the blade and the stud, so as to maintain a contact force per unit of surface area.
Bien entendu, la présente invention n'est pas limitée aux formes de réalisations décrites, et différentes modifications à la portée de l'homme du métier pourront y être apportées conformément à son esprit.Of course, the present invention is not limited to the embodiments described, and various modifications within the reach of the skilled person can be made in accordance with his spirit.
Claims (12)
- An electric contact device for a lamp base for a vehicle, in particular a motor vehicle, comprising an elastic conductive blade (1) in contact with a conductive contact block (2) situated on a base (3) of a bulb,
characterised in that the conductive blade (1) comprises at the level of the contact block (2) a hollow contact zone partially receiving the block and ensuring a non-surface electrical contact and a retention of the block in the lateral direction by at least two edge regions of the block distant from one another, no contact occurring in the central region of the said block. - A contact device according to Claim 1, for a lamp having bayonet-type assembly means,
characterised in that the hollow contact zone (5) has a hollow profiled shape, the longitudinal direction of which is essentially parallel to an axis passing through two pins (4) of the said assembly means. - A contact device according to Claim 2,
characterised in that the transversal width of the profiled contact zone (5) is less than the width of the block in the same direction. - A contact device according to Claim 2 or 3,
characterised in that the profiled contact zone (5) has a section in a general "V" shape. - A contact device according to Claim 2 or 3,
characterised in that the profiled contact zone has a section in a general shape of an arc of a circle. - A contact device according to Claim 5,
characterised in that the radius of curvature of the profiled contact zone is less than a minimum radius of curvature of the block. - A contact device according to Claim 1,
characterised in that the hollow contact zone (6) has the shape of a recess having a generally circular circumference. - A contact device according to Claim 7,
characterised in that the recess (6) has a spherical shape, with a radius of curvature less than a minimum radius of curvature of the contact block (2). - A contact device according to Claim 1,
characterised in that the hollow contact zone is defined by an orifice (7) of a smaller size than that of the contact block (2). - A contact device according to Claim 9,
characterised in that the said orifice (7) is circular and has fallen edges. - A lamp holder for a motor vehicle, defining at least one lamp socket,
characterised in that the or each socket is equipped with a contact device according to any one of Claims 1 to 10. - A signal lamp for an industrial motor vehicle,
characterised in that it is equipped with a lamp holder according to Claim 11.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9307899 | 1993-06-29 | ||
| FR9307899A FR2708151B1 (en) | 1993-06-29 | 1993-06-29 | Contact device for the stud of an electric lamp base of a motor vehicle. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0632547A1 EP0632547A1 (en) | 1995-01-04 |
| EP0632547B1 true EP0632547B1 (en) | 1996-08-21 |
Family
ID=9448669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94401462A Expired - Lifetime EP0632547B1 (en) | 1993-06-29 | 1994-06-28 | Contact device for the contact of an electric bulb of a motor vehicle |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0632547B1 (en) |
| AT (1) | ATE141718T1 (en) |
| DE (1) | DE69400396T2 (en) |
| ES (1) | ES2092871T3 (en) |
| FR (1) | FR2708151B1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1102280B (en) * | 1958-02-07 | 1961-03-16 | Elektroschaltgeraete Goerlitz | Incandescent lamp socket with position-changeable connection contact pieces, especially for high-voltage drum lights |
| DE1117748B (en) * | 1960-01-13 | 1961-11-23 | Ulo Werk M Ullmann | Incandescent lamp holder, especially for vehicle lights |
| DE2247713C3 (en) * | 1972-09-28 | 1976-01-08 | Bosch-Siemens Hausgeraete Gmbh, 7000 Stuttgart | Lamp holder |
| GB1436944A (en) * | 1972-11-21 | 1976-05-26 | Rists Wires & Cables Ltd | Bulb holders |
-
1993
- 1993-06-29 FR FR9307899A patent/FR2708151B1/en not_active Expired - Fee Related
-
1994
- 1994-06-28 ES ES94401462T patent/ES2092871T3/en not_active Expired - Lifetime
- 1994-06-28 AT AT94401462T patent/ATE141718T1/en not_active IP Right Cessation
- 1994-06-28 DE DE69400396T patent/DE69400396T2/en not_active Expired - Fee Related
- 1994-06-28 EP EP94401462A patent/EP0632547B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| FR2708151B1 (en) | 1995-10-13 |
| DE69400396T2 (en) | 1997-02-27 |
| ATE141718T1 (en) | 1996-09-15 |
| ES2092871T3 (en) | 1996-12-01 |
| DE69400396D1 (en) | 1996-09-26 |
| EP0632547A1 (en) | 1995-01-04 |
| FR2708151A1 (en) | 1995-01-27 |
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