EP0637715B1 - Replaceable light bulb mounting to a vehicle headlamp reflector - Google Patents

Replaceable light bulb mounting to a vehicle headlamp reflector Download PDF

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Publication number
EP0637715B1
EP0637715B1 EP94110308A EP94110308A EP0637715B1 EP 0637715 B1 EP0637715 B1 EP 0637715B1 EP 94110308 A EP94110308 A EP 94110308A EP 94110308 A EP94110308 A EP 94110308A EP 0637715 B1 EP0637715 B1 EP 0637715B1
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EP
European Patent Office
Prior art keywords
reflector
lamp
tongues
locking ring
opening
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94110308A
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German (de)
French (fr)
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EP0637715A1 (en
Inventor
Jan Bobcza
Heinrich Sottmann
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.)
Hella GmbH and Co KGaA
Original Assignee
Hella KGaA Huek and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hella KGaA Huek and Co filed Critical Hella KGaA Huek and Co
Publication of EP0637715A1 publication Critical patent/EP0637715A1/en
Application granted granted Critical
Publication of EP0637715B1 publication Critical patent/EP0637715B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/19Attachment of light sources or lamp holders
    • F21S41/194Bayonet attachments

Definitions

  • the invention relates to a device for releasably locking a lamp to a reflector of a vehicle headlight, with an opening made in the reflector, which is used to hold a lamp which can be passed from the rear of the reflector with its glass bulb through the opening of the reflector, and which has a base with a circumferential flange, from which positioning tabs extend radially outwards and with a locking ring which surrounds the opening of the reflector and is fastened to the reflector and is made of plastic and on which resilient tongues are formed, between which the lamp with its positioning tabs can be passed and which overlap the positioning tabs after a subsequent rotation of the lamp about its longitudinal axis, the positioning tabs sliding along a run-up slope of the tongues until the tongues in the end position of the lamp under Vo Apply tension to the positioning tabs and press the flange of the base against a contact surface directed against the direction of insertion of the lamp.
  • the locking ring In the device known from EP 0 292 200 A2 for releasably locking a lamp to a reflector of a vehicle headlight, not only the locking ring but also the reflector is made of plastic.
  • the plastic used for the locking ring must not only be highly heat-resistant and dimensionally stable, like the plastic for the reflector, but also have a sufficiently large elastic property, since the resilient tongues are molded onto the locking ring. That is why the plastic for the locking ring is currently much more expensive than the plastic for the reflector.
  • the expensive plastic for the locking ring increases the total costs for the headlight only slightly.
  • the glass bulb of the lamp surrounds a filament and the base of the lamp is made of plastic.
  • the electrical plug connection protrudes from the rear of the base and points with its free end radially outwards.
  • the flange is integrally formed between the glass bulb and the plug connection on the base with three radially outwardly projecting positioning tabs and is much thicker than the positioning tabs.
  • the positioning tabs are at a distance from the surface of the flange directed in the direction of insertion of the lamp.
  • a circumferential groove is made between the flange and the glass bulb, which serves to accommodate an annular seal.
  • the opening of the reflector for receiving the lamp is surrounded on the inside by a collar, on the inside of which the lamp lies tightly after the insertion with the ring seal surrounding the base.
  • the edge section of the opening of the reflector has the contact surface for the flange of the base of the lamp.
  • the resilient arms of the locking ring lie against the positioning tabs under pre-tension and press the flange against the contact surface of the reflector.
  • the fastening means on the reflector is a flange-like projection which is molded onto the reflector and surrounds its contact surface and which is directed radially outward.
  • this projection withstands the additional tensile forces and because it, like the reflector, is made of brittle plastic, it must be designed with a correspondingly thick wall. As a result, sink marks can occur on the inside of the reflector or, if these should not occur, the reflector in the area of its reflection surface must have a wall thickness as thick as the flange-like projection.
  • the locking ring engages behind the flange-like projection of the reflector with locking lugs which are formed on the outer circumferential edge of the locking ring and point with their free end in the direction of insertion of the lamp. So that the radially inwardly directed resilient arms of the locking ring always axially lock the lamp with a sufficiently large force, the distance between the resilient arms or their ramp surfaces and the contact surface of the reflector facing them must be tolerated accordingly small. It is very difficult to maintain such a small tolerance in practice because it is made up of several individual, added tolerances. A further disadvantage is that the locking ring can only be attached to a reflector which has a contact surface for the lamp which is precisely matched to it.
  • the object of the invention is to design the device described in the preamble of claim 1 for releasably locking a lamp on a reflector of a vehicle headlight in such a way that after insertion of the lamp the axial forces existing through the resilient tongues of the locking ring do not affect the connection between the locking ring and the reflector-producing fastening means can act in order to ensure that the fastening means can be dimensioned as small as possible, even if the resilient tongues rest with a very great force on the positioning tabs of the lamp.
  • the tightness of the lamp should always be secure even if the locking ring is used universally in many headlights and the reflector in the region of its opening receiving the lamp, e.g. B. is deformed by very high heat.
  • the reflector should be simple to design in the region of its opening that receives the lamp, and no additional part should be required to lock the lamp.
  • the locking ring consists in one piece of the resilient tongues and an inner edge portion which runs between the resilient tongues and the reflector at a distance from the contact surfaces of the tongues and whose side facing the tongues is the contact surface for the Has flange of the base of the lamp.
  • the reflector can be made both from plastic and from sheet metal.
  • the distance between the resilient tongues and the contact surface, which determines the axial tightness of the lamp is always the same, since it does not exist between two parts and therefore cannot change if the locking ring is incorrectly installed on the reflector.
  • the forces with which the resilient arms bear against the positioning tab of the lamp can be chosen so large that the lamp cannot automatically release itself from its jamming tight fit between the resilient arms and the contact surface.
  • the locking ring between two adjacent tongues is offset with an outer ring section toward the reflector and the inner edge section is molded onto the ring sections.
  • the locking ring is very torsion-resistant.
  • the inner edge section is circumferential and extends with radially outwardly directed wall sections to below the respective tongue, the inner edge section with its wall sections of an integral, annular, spaced apart from the resilient tongues Disc is formed.
  • the resilient tongues each have the annular disks offset from the reflector through side walls are connected, the inside of which adjoins the underside of the tongues so that they can be demolded together with the underside of the tongues and the side of the wall sections facing the tongues by means of an adjustable tool part which is displaced radially outward when the locking ring is removed from the mold.
  • Such a locking ring is simple and very inexpensive to manufacture.
  • each tongue is connected to the annular disk at the outer narrow edges of its root via a side wall and the side walls arranged between two tongues are directed towards it Merge the edge into a rib connecting them and molded onto the pane.
  • the torsional stiffness of the locking ring is particularly high.
  • At least one side wall extends radially inwards so far that its inside serves as a stop for a positioning tab of the lamp in the end position.
  • the central opening of the annular disc is surrounded by a collar directed towards the reflector, which extends into the opening of the reflector for the radial locking of the locking ring and the inside of which serves to radially fix the lamp.
  • the radial locking of the locking ring in the reflector is provided with simple means.
  • the locking ring has fastening means on the annular disk, by means of which the locking ring can be connected to the reflector. Holes introduced through the locking ring can serve as fastening means through which the Locking ring on its outside engaging behind projections of the reflector.
  • the annular disk is designed in the form of a shell, the shell being open towards the reflector.
  • the torsional rigidity of the locking ring is very high.
  • the side edge of the shell rests with its free end on the back of the reflector. This ensures that no bending moment can occur at the attachment points between the locking ring and the reflector when the lamp is changed.
  • the outer surface of the side edge of the cup-shaped disk serves as a contact surface for an annular rubber cap which surrounds the collar and which, with its outer peripheral edge, can be placed tightly on an opening in a housing of the vehicle headlight. In this way, a lamp can be replaced in a housing headlight without having to remove a cap covering the lamp.
  • the resilient tongues have an edge section directed against the direction of insertion of the lamp at their inwardly directed free end. As a result, it is not possible to defocuss the lamp, that is to say to insert it obliquely into the opening of the reflector, since the edge sections prevent the lamp from being able to be placed on the outside of one of the resilient tongues with a positioning tab.
  • the resilient tongues taper in thickness towards their free end. As a result, both the contact pressure and the axial spring travel of the tongues can be optimally large.
  • resilient tongues are each at their roots with a single side wall with the annular disk connected and extend in their longitudinal extension concentrically to the longitudinal axis of the lamp.
  • the locking ring in the area of its resilient tongues and its annular disk can have such a small outside diameter that it does not extend radially outward beyond the resilient tongues in this area and can protrude into a correspondingly small opening in a housing of the headlight.
  • fastening means are attached to the outer edge section of the bowl-shaped disk, by means of which the locking ring can be fastened to a supporting frame.
  • the locking ring carries both the lamp and the reflector, and nevertheless the fastening means which establish the connection between the locking ring and the reflector can continue to be of very small dimensions, since the fastening means carry a reflector, in which adjustment devices of the headlight do not produce any internal tensioning forces can and which is therefore very thin-walled.
  • the vehicle headlight (see FIG. 1) has a cup-shaped housing (1) made of plastic, the front opening of which is sealed off by a shell-shaped translucent cover plate (2).
  • a bowl-shaped reflector (3) is inserted, which is connected to the housing (1) by adjusting elements not shown in the drawing and by this around at least one axis is pivotable.
  • the reflector (3) is made of a heat-resistant, brittle plastic.
  • the bowl-shaped reflector (3) has an opening (4) in the area of its apex for receiving a lamp (5).
  • the lamp (5) shown as an individual part in FIG. 2 has a base (6) made of plastic, which has a glass bulb (8) surrounding a filament (7) on its front and a housing part (9) integrally formed on its back, which is open radially outwards and in the interior of which the plug connection (10) for the lamp (5) is arranged.
  • a radially outwardly directed flange (11) is integrally formed on the base (6) between the housing part (9) and the glass bulb (8) and carries three molded positioning tabs (12) on its end face. The flange (11) is much thicker than the positioning tabs (12).
  • the surfaces of the positioning tabs (12) and the flange (11) facing the rear of the lamp (5) lie in one plane, while the surfaces of the positioning tabs and facing the front of the lamp (5) of the flange are axially spaced apart.
  • a groove (13) accommodating an annular seal (13) is made all the way around the base (6).
  • the opening (4) made in the reflector (3) is surrounded on the outside by a neck (14) directed towards the rear of the vehicle headlight.
  • a locking ring (15) is attached to the rear of the reflector and is made of a heat-resistant, dimensionally stable and elastic plastic.
  • the locking ring (15) has three radially inwardly directed resilient tongues (16).
  • the ring sections (17) running between the tongues have fastening means (18) which are through openings made in the ring sections (17).
  • the through openings are surrounded by a rib (19) directed towards the rear of the headlight.
  • the three ring sections (17) are offset in the light exit direction to the plane in which the tongues (16) run, at a distance from the reflector (3).
  • the lamp (5) lies with its flange (11) on an inner peripheral edge section (21) of the locking ring (15).
  • Radially outwardly directed wall sections (22) are formed on the inner edge section (21) below the tongues (16).
  • the inner edge cut (21) and the wall sections (22) molded onto it run in one plane with the ring sections (17) and are a one-piece, annular disc, the central opening (29) of which has a smaller inner diameter than that of the free end sections the opening (16) formed.
  • the side walls (23) which connect the resilient tongues (16) to the ring sections (17) run with their facing inner side surfaces in such a way that they can be removed from the mold with an adjustable tool part which is adjusted radially outward when the locking ring (15) is removed from the mold .
  • the free end section of the tongues (16) has an edge section (24) directed towards the reflector (3) and an edge section (25) directed away from the reflector.
  • the edge section (24) has on the side facing the inner edge section (21), which forms the contact surface for the flange (11) of the lamp, a run-up surface (27) for the positioning tabs (12).
  • the side walls (23), which connect the resilient tongues (16) to the ring sections (17), are connected to one another on their inward-facing sides by a rib (28) molded onto the annular disk.
  • the central opening (29) which is surrounded by the inner edge section (21) of the annular disc has a circumferential collar (30) directed towards the reflector.
  • the collar (30) engages in the interior of the neck (14) of the reflector (3) largely without play.
  • the locking ring (15) is secured against rotation by a projection (31) formed on the outside of the collar (30), which engages in a corresponding clearance (20) on the inside of the neck (14) of the reflector (3).
  • the locking ring (15) is fixed axially by the end face of the neck (14) of the reflector (3), against which it rests with a surface adjacent to the collar (30).
  • a cylindrical side edge (32) directed towards the reflector (3) is formed on the outer edge of the annular disk having the central opening (29) and its end face adjoins the back of the bowl-shaped reflector at least in sections.
  • the locking ring (15) is axially locked to the reflector (3) by rivet-like pins (33) molded onto the rear of the reflector (3), which lead through the openings (18) of the ring sections (17) of the locking ring (15) and their the free end portion protruding from the opening (18) is shaped under the action of heat to form a head which engages over the edge of the opening (18).
  • the rib (19) surrounding the opening (18) forms a recess into which a sealant can be introduced.
  • the lamp (5) is then rotated clockwise about its longitudinal axis, the lamp (5) with its positioning tabs (12) engaging under the free end sections of the resilient tongues (16) and first on an inclined section (34) of a run-up surface (27 ) slides along the resilient tongues (16) until a positioning tab is gripped by an elevation (35) and this positioning tab (12) or another strikes against a radially inward extension (36) of a side wall (23).
  • the resilient tongues (16) with their contact surface (27) bear against the positioning tabs (12) of the lamp (5) and press the flange (11) against the inner edge portion (21) of the Locking ring (15).
  • a projection (40) is formed on the side of the radially outwardly directed wall sections (22) opposite the edge section (24) of the resilient tongues (16), which extension extends up to the positioning tabs (12) of the lamp (5).
  • the lugs (40) are rib-like and run below the free end of the tongues (16) from one side wall (23) to the other. There is therefore a gap between the edge section (24) of the resilient tongues (16) and the rib-like extension (40), through which the lamp (5) is positively guided when it is inserted with the positioning tabs (12) and therefore cannot be inserted at an angle.
  • the lamp (5) is in its end position with its positioning tabs (12) not against the lugs (40), but with its flange (11) on the contact surface (26).
  • the gap between the locking ring (15) and the peripheral edge of the opening (37) of the housing (1) is covered by an annular seal (38).
  • the annular seal (38) is meandering in cross-section and lies with its inner edge under prestress on the outside of the cylindrical side edge (32) of the locking ring (15), while the annular seal (38) with its outer edge is tight on one Opening (37) of the housing (1) surrounding collar (39) is placed.
  • the headlight shown in FIGS. 5 and 6 differs from the headlight shown in FIGS. 1 to 4 essentially in that the resilient tongues (16) extend concentrically to the longitudinal axis of the lamp (5) and their roots ( 41) with a single side wall (23) to which the annular disk consisting of the inner edge section (21), the wall sections (22) and the ring sections (17) are connected. At least one of the side walls (23) serves as a stop for a positioning tab (12) of the lamp (5).
  • the side edge (32) molded onto the annular disk runs in a cylinder, on which the tongues (16) adjoin with their radially outwardly directed narrow side.
  • the side walls (23) are extended in the direction of the free end of the tongue (16) adjacent to them and extend with the end section (45) of their extension along the outer edge of the annular disk.
  • annular disc At the side edge (32) of the bowl-shaped, annular disc is one at a distance molded to the bowl-shaped reflector (3) edge portion (42).
  • Four fastening means (43) are attached to the edge section (42), by means of which the locking ring (15) can be rigidly fastened to a support frame (44).
  • the fastening means (43) are formed by threaded bores made in the edge section (42), into which screws engage with their threaded shank.
  • the threaded shaft of the screws extends through bores in the edge section of a support frame (44) and its head rests against the back of the support frame (44).

Description

Die Erfindung betrifft eine Vorrichtung zur lösbaren Arretierung einer Lampe an einem Reflektor eines Fahrzeugscheinwerfers, mit einer in den Reflektor eingebrachten Öffnung, welche zur Aufnahme einer Lampe dient, die von der Rückseite des Reflektors her mit ihrem Glaskolben voraus durch die Öffnung des Reflektors hindurchführbar ist, und welche einen Sockel mit einem umlaufenden Flansch aufweist, von dem aus Positionierungslappen sich radial nach außen hin erstrecken und mit einem die Öffnung des Reflektors umgebenden und an dem Reflektor befestigten Arretierungsring, welcher aus Kunststoff hergestellt ist und an welchem federnde Zungen angeformt sind, zwischen welchen die Lampe mit ihren Positionierungslappen hindurchführbar ist und welche nach einem anschließenden Drehen der Lampe um ihre Längsachse die Positionierungslappen übergreifen, wobei die Positionierungslappen an einer Auflaufschräge der Zungen entlanggleiten, bis die Zungen in der Endstellung der Lampe unter Vorspannung an den Positionierungslappen anliegen und den Flansch des Sockels gegen eine entgegen der Einsetzrichtung der Lampe gerichtete Anlagefläche drücken.The invention relates to a device for releasably locking a lamp to a reflector of a vehicle headlight, with an opening made in the reflector, which is used to hold a lamp which can be passed from the rear of the reflector with its glass bulb through the opening of the reflector, and which has a base with a circumferential flange, from which positioning tabs extend radially outwards and with a locking ring which surrounds the opening of the reflector and is fastened to the reflector and is made of plastic and on which resilient tongues are formed, between which the lamp with its positioning tabs can be passed and which overlap the positioning tabs after a subsequent rotation of the lamp about its longitudinal axis, the positioning tabs sliding along a run-up slope of the tongues until the tongues in the end position of the lamp under Vo Apply tension to the positioning tabs and press the flange of the base against a contact surface directed against the direction of insertion of the lamp.

Bei der aus der EP 0 292 200 A2 bekannten Vorrichtung zur lösbaren Arretierung einer Lampe an einem Reflektor eines Fahrzeugscheinwerfers ist nicht nur der Arretierungsring, sondern auch der Reflektor aus Kunststoff hergestellt. Der für den Arretierungsring verwendete Kunststoff muß nicht nur, wie der Kunststoff für den Reflektor, hochwärmebeständig und formstabil sein, sondern auch eine ausreichend große elastische Eigenschaft besitzen, da an den Arretierungsring die federnden Zungen angeformt sind. Deshalb ist der Kunststoff für den Arretierungsring zur Zeit wesentlich teurer als der Kunststoff für den Reflektor. Da jedoch der Arretierungsring gegenüber dem Reflektor sehr klein ist, erhöhen sich durch den teuren Kunststoff für den Arretierungsring die Gesamtkosten für den Scheinwerfer nur wenig.In the device known from EP 0 292 200 A2 for releasably locking a lamp to a reflector of a vehicle headlight, not only the locking ring but also the reflector is made of plastic. The plastic used for the locking ring must not only be highly heat-resistant and dimensionally stable, like the plastic for the reflector, but also have a sufficiently large elastic property, since the resilient tongues are molded onto the locking ring. That is why the plastic for the locking ring is currently much more expensive than the plastic for the reflector. However, since the locking ring is very small compared to the reflector, the expensive plastic for the locking ring increases the total costs for the headlight only slightly.

Der Glaskolben der Lampe umgibt eine Glühwendel und der Sockel der Lampe besteht aus Kunststoff. Von der Rückseite des Sockels steht der elektrische Steckeranschluß ab und weist mit seinem freien Ende radial nach außen. Der Flansch ist zwischen dem Glaskolben und dem Steckeranschluß umlaufend an den Sockel mit drei radial nach außen abstehenden Positionierungslappen angeformt und wesentlich dicker als die Positionierungslappen ausgeführt. Die Positionierungslappen weisen einen Abstand zu der in Einsetzrichtung der Lampe gerichteten Fläche des Flansches auf. In den Sockel der Lampe ist zwischen dem Flansch und dem Glaskolben eine umlaufende Nut eingebracht, welche zur Aufnahme einer Ringdichtung dient.The glass bulb of the lamp surrounds a filament and the base of the lamp is made of plastic. The electrical plug connection protrudes from the rear of the base and points with its free end radially outwards. The flange is integrally formed between the glass bulb and the plug connection on the base with three radially outwardly projecting positioning tabs and is much thicker than the positioning tabs. The positioning tabs are at a distance from the surface of the flange directed in the direction of insertion of the lamp. In the base of the lamp, a circumferential groove is made between the flange and the glass bulb, which serves to accommodate an annular seal.

Die zur Aufnahme der Lampe dienende Öffnung des Reflektors ist auf ihrer Innenseite von einem Kragen umgeben, an dessen Innenseite die Lampe nach ihrem Einsetzen mit der den Sockel umgebenden Ringdichtung dicht anliegt. Der Randabschnitt der Öffnung des Reflektors weist die Anlagefläche für den Flansch des Sockels der Lampe auf. Nach dem Einsetzen der Lampe liegen die federnden Arme des Arretierungsringes an den Positionierungslappen unter Vorspannung an und drücken den Flansch gegen die Anlagefläche des Reflektors. Somit bestehen zwischen dem Reflektor und dem an dem Reflektor befestigten Arretierungsring nicht nur die Haltekräfte für den Arretierungsring, sondern auch die zur Arretierung der Lampe dienenden hohen Verspannungskräfte. Damit die Befestigungsmittel zwischen Reflektor und Arretierungsring zusätzlich diese hohen Verspannungskräfte aufnehmen können, müssen sie entsprechend stabil ausgeführt sein. Das Befestigungsmittel am Reflektor ist ein an den Reflektor angeformter und seine Anlagefläche umgebender flanschartiger Vorsprung, welcher radial nach außen gerichtet ist. Damit dieser Vorsprung den zusätzlichen Verspannungskräften standhält und weil er, wie der Reflektor, aus sprödem Kunststoff hergestellt ist, muß er entsprechend dickwandig ausgeführt sein. Dadurch können auf der Innenseite des Reflektors Einfallstellen entstehen oder wenn diese nicht auftreten sollen, muß der Reflektor im Bereich seiner Reflexionsfläche eine so dicke Wandstärke aufweisen wie der flanschartige Vorsprung. Der Arretierungsring hintergreift mit Rastfahnen, welche an dem äußeren umlaufenden Rand des Arretierungsringes angeformt sind und mit ihrem freien Ende in Einsetzrichtung der Lampe weisen, den flanschartigen Vorsprung des Reflektors. Damit die radial nach innen gerichteten federnden Arme des Arretierungsringes immer mit einer ausreichend großen Kraft die Lampe axial arretieren, muß der Abstand zwischen den federnden Armen bzw. ihren Auflaufflächen und der ihnen zugewandten Anlagefläche des Reflektors entsprechend klein toleriert sein. Eine so kleine Toleranz in der Praxis einzuhalten ist sehr schwierig, da sie sich aus mehreren einzelnen, addierten Toleranzen zusammensetzt. Nachteilig ist es weiterhin, daß der Arretierungsring ausschließlich an einem Reflektor befestigbar ist, welcher eine genau auf ihn abgestimmte Anlagefläche für die Lampe aufweist.The opening of the reflector for receiving the lamp is surrounded on the inside by a collar, on the inside of which the lamp lies tightly after the insertion with the ring seal surrounding the base. The edge section of the opening of the reflector has the contact surface for the flange of the base of the lamp. After inserting the lamp, the resilient arms of the locking ring lie against the positioning tabs under pre-tension and press the flange against the contact surface of the reflector. Thus, between the reflector and the locking ring attached to the reflector, there are not only the holding forces for the locking ring, but also the high tensioning forces used to lock the lamp. So that the fastening means between the reflector and the locking ring can additionally absorb these high tensioning forces, they must be designed to be correspondingly stable. The fastening means on the reflector is a flange-like projection which is molded onto the reflector and surrounds its contact surface and which is directed radially outward. In order to this projection withstands the additional tensile forces and because it, like the reflector, is made of brittle plastic, it must be designed with a correspondingly thick wall. As a result, sink marks can occur on the inside of the reflector or, if these should not occur, the reflector in the area of its reflection surface must have a wall thickness as thick as the flange-like projection. The locking ring engages behind the flange-like projection of the reflector with locking lugs which are formed on the outer circumferential edge of the locking ring and point with their free end in the direction of insertion of the lamp. So that the radially inwardly directed resilient arms of the locking ring always axially lock the lamp with a sufficiently large force, the distance between the resilient arms or their ramp surfaces and the contact surface of the reflector facing them must be tolerated accordingly small. It is very difficult to maintain such a small tolerance in practice because it is made up of several individual, added tolerances. A further disadvantage is that the locking ring can only be attached to a reflector which has a contact surface for the lamp which is precisely matched to it.

Aufgabe der Erfindung ist es, die im Oberbegriff des Anspruchs 1 beschriebene Vorrichtung zur lösbaren Arretierung einer Lampe an einem Reflektor eines Fahrzeugscheinwerfers derart zu gestalten, daß nach dem Einsetzen der Lampe die durch die federnden Zungen des Arretierungsringes bestehenden axialen Kräfte nicht auf die die Verbindung zwischen dem Arretierungsring und dem Reflektor herstellenden Befestigungsmittel wirken können, um zu erreichen, daß die Befestigungsmittel, auch wenn die federnden Zungen mit einer sehr großen Kraft an den Positionierungslappen der Lampe anliegen, möglichst klein dimensioniert werden können. Außerdem soll der Festsitz der Lampe auch dann immer sicher sein, wenn der Arretierungsring universell bei vielen Scheinwerfern verwendet wird und der Reflektor im Bereich seiner die Lampe aufnehmenden Öffnung, z. B. durch sehr große Wärmeeinwirkung deformiert ist. Darüber hinaus soll der Reflektor im Bereich seiner die Lampe aufnehmenden Öffnung einfach gestaltet werden können und zur Arretierung der Lampe soll weiterhin kein zusätzliches Teil notwendig sein. Diese Aufgabe wird nach der Erfindung dadurch gelöst, daß der Arretierungsring einstückig aus den federnden Zungen und einem inneren Randabschnitt besteht, welcher zwischen den federnden Zungen und dem Reflektor in einem Abstand zu den Auflaufflächen der Zungen verläuft und dessen den Zungen zugewandte Seite die Anlagefläche für den Flansch des Sockels der Lampe aufweist. Hierbei ist es weiterhin vorteilhaft, daß der Reflektor sowohl aus Kunststoff als auch aus Blech hergestellt sein kann. Außerdem ist der für den axialen Festsitz der Lampe bestimmende Abstand zwischen den federnden Zungen und der Anlagefläche immer gleich groß, da er nicht zwischen zwei Teilen besteht und sich somit bei unkorrekter Montage des Arretierungsringes am Reflektor nicht verändern kann. Ferner können die Kräfte, mit welchen die federnden Arme an dem Positionierungslappen der Lampe anliegen so groß gewählt werden, daß sich die Lampe nicht aus ihrem klemmenden Festsitz zwischen den federnden Armen und der Anlagefläche selbsttätig lösen kann.The object of the invention is to design the device described in the preamble of claim 1 for releasably locking a lamp on a reflector of a vehicle headlight in such a way that after insertion of the lamp the axial forces existing through the resilient tongues of the locking ring do not affect the connection between the locking ring and the reflector-producing fastening means can act in order to ensure that the fastening means can be dimensioned as small as possible, even if the resilient tongues rest with a very great force on the positioning tabs of the lamp. In addition, the tightness of the lamp should always be secure even if the locking ring is used universally in many headlights and the reflector in the region of its opening receiving the lamp, e.g. B. is deformed by very high heat. In addition, the reflector should be simple to design in the region of its opening that receives the lamp, and no additional part should be required to lock the lamp. This object is achieved according to the invention in that the locking ring consists in one piece of the resilient tongues and an inner edge portion which runs between the resilient tongues and the reflector at a distance from the contact surfaces of the tongues and whose side facing the tongues is the contact surface for the Has flange of the base of the lamp. It is also advantageous here that the reflector can be made both from plastic and from sheet metal. In addition, the distance between the resilient tongues and the contact surface, which determines the axial tightness of the lamp, is always the same, since it does not exist between two parts and therefore cannot change if the locking ring is incorrectly installed on the reflector. Furthermore, the forces with which the resilient arms bear against the positioning tab of the lamp can be chosen so large that the lamp cannot automatically release itself from its jamming tight fit between the resilient arms and the contact surface.

Vorteilhaft ist es weiterhin, wenn der Arretierungsring zwischen zwei benachbarten Zungen mit einem äußeren Ringabschnitt zum Reflektor hin versetzt verläuft und an die Ringabschnitte der innere Randabschnitt angeformt ist. Dadurch ist der Arretierungsring sehr verwindungssteif ausgeführt. In diesem Zusammenhang ist es weiterhin vorteilhaft, wenn der innere Randabschnitt umlaufend ausgeführt ist und mit radial nach außen gerichteten Wandabschnitten sich bis unterhalb der jeweiligen Zunge erstreckt, wobei der innere Randabschnitt mit seinen Wandabschnitten von einer in einem Abstand zu den federnden Zungen verlaufenden einstückigen, ringförmige Scheibe gebildet ist. Hierbei ist es weiterhin vorteilhaft, wenn die federnden Zungen jeweils mit der zum Reflektor hin versetzt angeordneten ringförmigen Scheiben durch Seitenwände verbunden sind, deren an die Unterseite der Zungen angrenzende Innenseite so verläuft, daß sie zusammen mit der Unterseite der Zungen und der den Zungen zugewandten Seite der Wandabschnitte durch ein verstellbares Werkzeugteil, welches beim Entformen des Arretierungsringes radial nach außen verstellt wird, entformbar sind. Ein solcher Arretierungsring ist einfach und sehr kostengünstig herstellbar.It is also advantageous if the locking ring between two adjacent tongues is offset with an outer ring section toward the reflector and the inner edge section is molded onto the ring sections. As a result, the locking ring is very torsion-resistant. In this context, it is also advantageous if the inner edge section is circumferential and extends with radially outwardly directed wall sections to below the respective tongue, the inner edge section with its wall sections of an integral, annular, spaced apart from the resilient tongues Disc is formed. It is also advantageous here if the resilient tongues each have the annular disks offset from the reflector through side walls are connected, the inside of which adjoins the underside of the tongues so that they can be demolded together with the underside of the tongues and the side of the wall sections facing the tongues by means of an adjustable tool part which is displaced radially outward when the locking ring is removed from the mold. Such a locking ring is simple and very inexpensive to manufacture.

Bei Zungen, welche mit ihrem freien Ende radial nach innen gerichtet sind, ist es außerdem vorteilhaft, wenn jede Zunge an den äußeren schmalen Rändern ihrer Wurzel über eine Seitenwand mit der ringförmigen Scheibe verbunden sind und die zwischen zwei Zungen angeordneten Seitenwände mit ihrem nach innen gerichteten Rand in eine sie verbindende und an die Scheibe angeformte Rippe übergehen. Dadurch ist die Verwindungssteifigkeit des Arretierungsringes besonders groß.In the case of tongues which are directed radially inward with their free end, it is also advantageous if each tongue is connected to the annular disk at the outer narrow edges of its root via a side wall and the side walls arranged between two tongues are directed towards it Merge the edge into a rib connecting them and molded onto the pane. As a result, the torsional stiffness of the locking ring is particularly high.

Ferner ist es vorteilhaft, wenn zumindest eine Seitenwand sich radial so weit nach innen hin erstreckt, daß ihre Innenseite in der Endstellung als Anschlag für einen Positionierungslappen der Lampe dient. Eine solche Lösung ist einfach und kostengünstig herstellbar.Furthermore, it is advantageous if at least one side wall extends radially inwards so far that its inside serves as a stop for a positioning tab of the lamp in the end position. Such a solution is simple and inexpensive to manufacture.

Zudem ist es vorteilhaft, wenn die zentrale Öffnung der ringförmigen Scheibe von einem zum Reflektor hin gerichteten Kragen umgeben ist, welcher sich zur radialen Arretierung des Arretierungsringes in die Öffnung des Reflektors hineinerstreckt und dessen Innenseite zur radialen Fixierung der Lampe dient. Dadurch ist mit einfachen Mitteln die radiale Arretierung des Arretierungsringes in dem Reflektor gegeben.In addition, it is advantageous if the central opening of the annular disc is surrounded by a collar directed towards the reflector, which extends into the opening of the reflector for the radial locking of the locking ring and the inside of which serves to radially fix the lamp. As a result, the radial locking of the locking ring in the reflector is provided with simple means.

Weiterhin ist es vorteilhaft, wenn der Arretierungsring an der ringförmigen Scheibe Befestigungsmittel aufweist, durch welche der Arretierungsring mit dem Reflektor verbindbar ist. Als Befestigungsmittel können in den Arretierungsring eingebrachte Löcher dienen, durch welche den Arretierungsring auf seiner Außenseite hintergreifende Vorsprünge des Reflektors hindurchgeführt sind.Furthermore, it is advantageous if the locking ring has fastening means on the annular disk, by means of which the locking ring can be connected to the reflector. Holes introduced through the locking ring can serve as fastening means through which the Locking ring on its outside engaging behind projections of the reflector.

Ein weiterer Vorteil ist es, wenn die ringförmige Scheibe schalenförmig ausgeführt ist, wobei die Schale zum Reflektor hin geöffnet ist. Dadurch ist die Verwindungssteifigkeit des Arretierungsringes sehr groß. In diesem Zusammenhang ist es weiterhin vorteilhaft, wenn der Seitenrand der Schale mit seinem freien Ende an der Rückseite des Reflektors anliegt. Dadurch ist es sicher, daß beim Wechsel der Lampe kein Biegemoment an den Befestigungsstellen zwischen Arretierungsring und Reflektor auftreten kann.It is a further advantage if the annular disk is designed in the form of a shell, the shell being open towards the reflector. As a result, the torsional rigidity of the locking ring is very high. In this context, it is also advantageous if the side edge of the shell rests with its free end on the back of the reflector. This ensures that no bending moment can occur at the attachment points between the locking ring and the reflector when the lamp is changed.

Bei einer besonders vorteilhaften Weiterbildung der Erfindung dient die äußere Oberfläche des Seitenrandes der schalenförmigen Scheibe als Anlagefläche für eine den Kragen umgebende ringförmige Gummikappe, welche mit ihrem äußeren umlaufenden Rand dicht auf eine Öffnung eines Gehäuses des Fahrzeugscheinwerfers aufsetzbar ist. Dadurch kann bei einem Gehäusescheinwerfer ein Lampenwechsel vorgenommen werden, ohne eine die Lampe abdeckende Kappe demontieren zu müssen.In a particularly advantageous development of the invention, the outer surface of the side edge of the cup-shaped disk serves as a contact surface for an annular rubber cap which surrounds the collar and which, with its outer peripheral edge, can be placed tightly on an opening in a housing of the vehicle headlight. In this way, a lamp can be replaced in a housing headlight without having to remove a cap covering the lamp.

Ebenfalls ist es vorteilhaft, wenn die federnden Zungen an ihrem nach innen gerichteten freien Ende einen entgegen der Einsetzrichtung der Lampe gerichteten Randabschnitt aufweisen. Dadurch ist es nicht möglich, die Lampe defocussiert, das heißt schräg in die Öffnung des Reflektors einzusetzen, da die Randabschnitte verhindern, daß die Lampe mit einem Positionierungslappen außen an einer der federnden Zungen anlegbar ist.It is also advantageous if the resilient tongues have an edge section directed against the direction of insertion of the lamp at their inwardly directed free end. As a result, it is not possible to defocuss the lamp, that is to say to insert it obliquely into the opening of the reflector, since the edge sections prevent the lamp from being able to be placed on the outside of one of the resilient tongues with a positioning tab.

Zudem ist es vorteilhaft, wenn die federnden Zungen sich in der Dicke zu ihrem freien Ende hin verjüngen. Dadurch kann sowohl der Anpreßdruck als auch der axiale Federweg der Zungen optimal groß sein.In addition, it is advantageous if the resilient tongues taper in thickness towards their free end. As a result, both the contact pressure and the axial spring travel of the tongues can be optimally large.

Bei einer besonders vorteilhaften Weiterbildung der Erfindung sind federnde Zungen an ihrer Wurzel jeweils mit einer einzigen Seitenwand mit der ringförmigen Scheibe verbunden und verlaufen in ihrer Längsausdehnung konzentrisch zur Längsachse der Lampe. Dadurch kann der Arretierungsring im Bereich seiner federnden Zungen und seiner ringförmigen Scheibe einen so kleinen Außendurchmesser aufweisen, daß er in diesem Bereich sich radial nach außen nicht über die federnden Zungen hinaus erstreckt und in eine entsprechend kleine öffnung eines Gehäuses des Scheinwerfers hineinragen kann.In a particularly advantageous development of the invention, resilient tongues are each at their roots with a single side wall with the annular disk connected and extend in their longitudinal extension concentrically to the longitudinal axis of the lamp. As a result, the locking ring in the area of its resilient tongues and its annular disk can have such a small outside diameter that it does not extend radially outward beyond the resilient tongues in this area and can protrude into a correspondingly small opening in a housing of the headlight.

Weiterhin ist es vorteilhaft, wenn an dem äußeren Randabschnitt der schalenförmigen Scheibe Befestigungsmittel angebracht sind, durch welche der Arretierungsring an einem Traggestell befestigbar ist. Dadurch trägt der Arretierungsring sowohl die Lampe als auch den Reflektor und trotzdem können die Befestigungsmittel, welche die Verbindung zwischem dem Arretierungsring und dem Reflektor herstellen, weiterhin sehr klein dimensioniert sein, da die Befestigungsmittel einen Reflektor tragen, bei welchen Einstelleinrichtungen des Scheinwerfers keine inneren Verspannungskräfte hervorrufen können und welcher somit sehr dünnwandig herstellbar ist.Furthermore, it is advantageous if fastening means are attached to the outer edge section of the bowl-shaped disk, by means of which the locking ring can be fastened to a supporting frame. As a result, the locking ring carries both the lamp and the reflector, and nevertheless the fastening means which establish the connection between the locking ring and the reflector can continue to be of very small dimensions, since the fastening means carry a reflector, in which adjustment devices of the headlight do not produce any internal tensioning forces can and which is therefore very thin-walled.

Zwei Ausführungsbeispiele nach der Erfindung sind in den Zeichnungen dargestellt und zwar zeigen

Figur 1
einen mittleren, vertikalen Längsschnitt durch einen Scheinwerfer für Fahrzeuge mit einer ersten an seinem Reflektor angeordneten Vorrichtung zur lösbaren Arretierung einer Lampe;
Figur 2
in einer perspektivischen Ansicht die Lampe aus Figur 1 als Einzelteil;
Figur 3
eine Ansicht Richtung X auf einen an der Rückseite des Reflektors befestigten Arretierungsring als Einzelteil;
Figur 4
ein Schnitt nach der Linie A-A in Figur 3;
Figur 5
einen mittleren, vertikalen Längsschnitt durch einen Scheinwerfer für Fahrzeuge mit einer zweiten an seinem Reflektor angeordneten Vorrichtung zur lösbaren Arretierung einer Lampe;
Figur 6
eine Ansicht aus Richtung y auf einen anderen Reflektor der Figur 5 befestigten Arretierungsring als Einzelteil.
Two embodiments according to the invention are shown in the drawings and show
Figure 1
a middle, vertical longitudinal section through a headlight for vehicles with a first device arranged on its reflector for releasably locking a lamp;
Figure 2
in a perspective view the lamp of Figure 1 as a single part;
Figure 3
a view direction X on a locking ring attached to the back of the reflector as a single part;
Figure 4
a section along the line AA in Figure 3;
Figure 5
a middle, vertical longitudinal section through a headlight for vehicles with a second device arranged on its reflector for releasably locking a lamp;
Figure 6
a view from the direction y on another reflector of Figure 5 attached locking ring as a single part.

Der Fahrzeugscheinwerfer (siehe Figur 1) weist ein aus Kunststoff bestehendes topfförmiges Gehäuse (1) auf, dessen vordere Öffnung dicht von einer schalenförmigen lichtdurchlässigen Abschlußscheibe (2) abgeschlossen ist. In den von der Abschlußscheibe (2) und dem Gehäuse (1) gebildeten Innenraum des Fahrzeugscheinwerfers ist ein schalenförmiger Reflektor (3) eingesetzt, welcher durch in der Zeichnung nicht dargestellte Verstellelemente mit dem Gehäuse (1) verbunden ist und durch diese um mindestens eine Achse verschwenkbar ist. Der Reflektor (3) ist aus einem hochwarmfesten spröden Kunststoff hergestellt. Der schalenförmige Reflektor (3) weist im Bereich seines Scheitels eine Öffnung (4) zur Aufnahme einer Lampe (5) auf.The vehicle headlight (see FIG. 1) has a cup-shaped housing (1) made of plastic, the front opening of which is sealed off by a shell-shaped translucent cover plate (2). In the interior of the vehicle headlamp formed by the cover plate (2) and the housing (1), a bowl-shaped reflector (3) is inserted, which is connected to the housing (1) by adjusting elements not shown in the drawing and by this around at least one axis is pivotable. The reflector (3) is made of a heat-resistant, brittle plastic. The bowl-shaped reflector (3) has an opening (4) in the area of its apex for receiving a lamp (5).

Die in Figur 2 als Einzelteil dargestellte Lampe (5) weist einen aus Kunststoff hergestellten Sockel (6) auf, welcher an seiner Vorderseite einen eine Glühwendel (7) umgebenden Glaskolben (8) und an seiner Rückseite ein einstückig angeformtes Gehäuseteil (9) trägt, welches radial nach außen geöffnet ist und in dessen Inneren der Steckanschluß (10) für die Lampe (5) angeordnet ist. An den Sockel (6) ist zwischen dem Gehäuseteil (9) und dem Glaskolben (8) umlaufend ein radial nach außen gerichteter Flansch (11) angeformt, welcher an seiner Stirnfläche drei angeformte Positionierungslappen (12) trägt. Der Flansch (11) ist wesentlich dicker als die Positionierungslappen (12) ausgeführt. Die zur Rückseite der Lampe (5) hin gerichteten Flächen der Positionierungslappen (12) und des Flansches (11) liegen in einer Ebene, während die zur Vorderseite der Lampe (5) gerichteten Flächen der Positionierungslappen und des Flansches axial zueinander beabstandet sind. Zwischen dem Flansch (11) und dem Glaskolben (8) ist in den Sockel (6) umlaufend eine eine Ringdichtung (13) aufnehmende Nut eingebracht.The lamp (5) shown as an individual part in FIG. 2 has a base (6) made of plastic, which has a glass bulb (8) surrounding a filament (7) on its front and a housing part (9) integrally formed on its back, which is open radially outwards and in the interior of which the plug connection (10) for the lamp (5) is arranged. A radially outwardly directed flange (11) is integrally formed on the base (6) between the housing part (9) and the glass bulb (8) and carries three molded positioning tabs (12) on its end face. The flange (11) is much thicker than the positioning tabs (12). The surfaces of the positioning tabs (12) and the flange (11) facing the rear of the lamp (5) lie in one plane, while the surfaces of the positioning tabs and facing the front of the lamp (5) of the flange are axially spaced apart. Between the flange (11) and the glass bulb (8) a groove (13) accommodating an annular seal (13) is made all the way around the base (6).

Die in den Reflektor (3) eingebrachte Öffnung (4) ist außen von einem zur Rückseite des Fahrzeugscheinwerfers hin gerichteten Hals (14) umgeben. An der Reflektorrückseite ist ein Arretierungsring (15) befestigt, welcher aus einem hochwarmfesten, formstabilen und elastischen Kunststoff besteht. Der Arretierungsring (15) weist drei radial nach innen gerichtete federnde Zungen (16) auf. Die zwischen den Zungen verlaufenden Ringabschnitte (17) weisen Befestigungsmittel (18) auf, welche in die Ringabschnitte (17) eingebrachte Durchgangsöffnungen sind. Die Durchgangsöffnungen sind von einer zur Rückseite des Scheinwerfers hin gerichteten Rippe (19) umgeben. Die drei Ringabschnitte (17) sind in Lichtaustrittsrichtung gesehen zu der Ebene, in welcher die Zungen (16) verlaufen, in einem Abstand zum Reflektor (3) hin versetzt angeordnet. Zwischen den freien Endabschnitten der Zungen (16) bestehen Freimachungen (20), durch welche die Lampe (5) mit ihren Positionierungslappen (12) hindurchführbar ist. Nach einem solchen Hindurchführen liegt die Lampe (5) mit ihrem Flansch (11) an einem inneren umlaufenden Randabschnitt (21) des Arretierungsringes (15) an. An den inneren Randabschnitt (21) sind unterhalb der Zungen (16) verlaufende radial nach außen gerichtete Wandabschnitte (22) angeformt. Der innere Randschnitt (21) und die an ihn angeformten Wandabschnitte (22) verlaufen mit den Ringabschnitten (17) in einer Ebene und sind eine einstückige, ringförmige Scheibe, deren zentrale Öffnung (29) einen kleineren Innendurchmesser aufweist, als die von den freien Endabschnitten der Zungen (16) gebildete Öffnung. Die die federnden Zungen (16) jeweils mit den Ringabschnitten (17) verbindenden Seitenwände (23) verlaufen so mit ihren sich zugewandten inneren Seitenflächen, daß sie mit einem verstellbaren Werkzeugteil entformbar sind, welches beim Entformen des Arretierungsringes (15) radial nach außen verstellt wird. An den freien Endabschnitt der Zungen (16) ist ein zum Reflektor (3) hin gerichteter Randabschnitt (24) und ein vom Reflektor weg gerichteter Randabschnitt (25) angeformt. Der Randabschnitt (24) weist auf der dem inneren Randabschnitt (21) zugewandten Seite, welcher für den Flansch (11) der Lampe die Anlagefläche bildet, eine Auflauffläche (27) für die Positionierungslappen (12) auf. Die Seitenwände (23), welche die federnden Zungen (16) mit den Ringabschnitten (17) verbinden, sind an ihren nach innen gerichteten Seiten durch eine an die ringförmige Scheibe angeformte Rippe (28) miteinander verbunden. Die von dem inneren Randabschnitt (21) der ringförmigen Scheibe umgebende zentrale Öffnung (29), weist einen zu dem Reflektor hin gerichteten umlaufenden Kragen (30) auf. Der Kragen (30) greift weitgehend spielfrei in das Innere des Halses (14) des Reflektors (3) ein. Gegen Verdrehen ist der Arretierungsring (15) durch einen an der Außenseite des Kragens (30) angeformten Ansatz (31), welcher in einer entsprechenden Freimachung (20) an der Innenseite des Halses (14) des Reflektors (3) eingreift, gesichert. Axial ist der Arretierungsring (15) durch die Stirnfläche des Halses (14) des Reflektors (3) fixiert, an welcher er mit einer an den Kragen (30) angrenzenden Fläche anliegt. An den äußeren Rand der die zentrale Öffnung (29) aufweisenden ringförmigen Scheibe ist ein zum Reflektor (3) hin gerichteter zylindrischer Seitenrand (32) angeformt, welcher mit seiner Stirnfläche mindestens abschnittsweise an die Rückseite des schalenförmigen Reflektors angrenzt. Der Arretierungsring (15) ist axial an dem Reflektor (3) durch an die Rückseite des Reflektors (3) angeformte nietartige Stifte (33) arretiert, welche durch die Öffnungen (18) der Ringabschnitte (17) des Arretierungsringes (15) hindurchführen und deren aus der Öffnung (18) herausragende freien Endabschnitt unter Wärmeeinwirkung zu einem Kopf geformt ist, welcher den Rand der Öffnung (18) übergreift. Die die Öffnung (18) umgebende Rippe (19) bildet eine Vertiefung, in welche ein Dichtungsmittel einbringbar ist. Beim Einsetzen der Lampe (5) wird diese mit ihrem Glaskolben (8) voraus durch die Öffnung (29) des Arretierungsringes (15) und die Öffnung (4) des Reflektors (3) hindurchgeführt, wobei die drei radial nach außen gerichteten Positionierungslappen (12) der Lampe (5) durch die zwischen den Zungen (16) angeordneten Freimachungen (20) hindurchgeführt werden bis die Lampe (5) mit ihrem Flansch (11) an der Anlagefläche (26) des inneren Randabschnittes (21) des Arretierungsringes (15) anliegt. Danach wird die Lampe (5) um ihre Längsachse im Uhrzeigersinn gedreht, wobei die Lampe (5) mit ihren Positionierungslappen (12) die freien Endabschnitte der federnden Zungen (16) untergreift und zuerst an einem schräg verlaufenden Abschnitt (34) einer Auflauffläche (27) der federnden Zungen (16) entlanggleitet bis ein Positionierungslappen von einer Erhöhung (35) hintergriffen ist und dieser Positionierungslappen (12) oder ein anderer gegen eine radial nach innen gerichtete Verlängerung (36) einer Seitenwand (23) anschlägt. In dieser Endstellung der Lampe (5) liegen die federnden Zungen (16) mit ihrer Auflauffläche (27) unter Vorspannung an den Positionierungslappen (12) der Lampe (5) an und drücken den Flansch (11) gegen den inneren Randabschnitt (21) des Arretierungsringes (15). An die dem Randabschnitt (24) der federnden Zungen (16) gegenüberliegende Seite der radial nach außen gerichteten Wandabschnitte (22) ist ein Ansatz (40) angeformt, welcher sich bis nahe zu den Positionierungslappen (12) der Lampe (5) hin erstreckt. Die Ansätze (40) sind rippenartig ausgeführt und verlaufen unterhalb dem freien Ende der Zungen (16) von einer Seitenwand (23) zur anderen. Somit besteht zwischen dem Randabschnitt (24) der federnden Zungen (16) und dem rippenartigen Ansatz (40) ein Spalt, durch welchen die Lampe (5) bei ihrem Einsetzen mit den Positionierungslappen (12) zwangsgeführt ist und somit nicht schräg eingesetzt werden kann. Die Lampe (5) liegt in ihrer Endstellung mit ihren Positionierungslappen (12) nicht an den Ansätzen (40), sondern mit ihrem Flansch (11) an der Anlagefläche (26) an.The opening (4) made in the reflector (3) is surrounded on the outside by a neck (14) directed towards the rear of the vehicle headlight. A locking ring (15) is attached to the rear of the reflector and is made of a heat-resistant, dimensionally stable and elastic plastic. The locking ring (15) has three radially inwardly directed resilient tongues (16). The ring sections (17) running between the tongues have fastening means (18) which are through openings made in the ring sections (17). The through openings are surrounded by a rib (19) directed towards the rear of the headlight. The three ring sections (17) are offset in the light exit direction to the plane in which the tongues (16) run, at a distance from the reflector (3). Between the free end sections of the tongues (16) there are clearances (20) through which the lamp (5) with its positioning tabs (12) can be passed. After such a passage, the lamp (5) lies with its flange (11) on an inner peripheral edge section (21) of the locking ring (15). Radially outwardly directed wall sections (22) are formed on the inner edge section (21) below the tongues (16). The inner edge cut (21) and the wall sections (22) molded onto it run in one plane with the ring sections (17) and are a one-piece, annular disc, the central opening (29) of which has a smaller inner diameter than that of the free end sections the opening (16) formed. The side walls (23) which connect the resilient tongues (16) to the ring sections (17) run with their facing inner side surfaces in such a way that they can be removed from the mold with an adjustable tool part which is adjusted radially outward when the locking ring (15) is removed from the mold . At The free end section of the tongues (16) has an edge section (24) directed towards the reflector (3) and an edge section (25) directed away from the reflector. The edge section (24) has on the side facing the inner edge section (21), which forms the contact surface for the flange (11) of the lamp, a run-up surface (27) for the positioning tabs (12). The side walls (23), which connect the resilient tongues (16) to the ring sections (17), are connected to one another on their inward-facing sides by a rib (28) molded onto the annular disk. The central opening (29) which is surrounded by the inner edge section (21) of the annular disc has a circumferential collar (30) directed towards the reflector. The collar (30) engages in the interior of the neck (14) of the reflector (3) largely without play. The locking ring (15) is secured against rotation by a projection (31) formed on the outside of the collar (30), which engages in a corresponding clearance (20) on the inside of the neck (14) of the reflector (3). The locking ring (15) is fixed axially by the end face of the neck (14) of the reflector (3), against which it rests with a surface adjacent to the collar (30). A cylindrical side edge (32) directed towards the reflector (3) is formed on the outer edge of the annular disk having the central opening (29) and its end face adjoins the back of the bowl-shaped reflector at least in sections. The locking ring (15) is axially locked to the reflector (3) by rivet-like pins (33) molded onto the rear of the reflector (3), which lead through the openings (18) of the ring sections (17) of the locking ring (15) and their the free end portion protruding from the opening (18) is shaped under the action of heat to form a head which engages over the edge of the opening (18). The rib (19) surrounding the opening (18) forms a recess into which a sealant can be introduced. When the lamp (5) is inserted, its glass bulb (8) is passed through the opening (29) of the locking ring (15) and the opening (4) of the reflector (3), the three radially outward positioning tabs (12 ) of the lamp (5) through the clearances (20) arranged between the tongues (16) until the lamp (5) with its flange (11) on the contact surface (26) of the inner edge portion (21) of the locking ring (15) is present. The lamp (5) is then rotated clockwise about its longitudinal axis, the lamp (5) with its positioning tabs (12) engaging under the free end sections of the resilient tongues (16) and first on an inclined section (34) of a run-up surface (27 ) slides along the resilient tongues (16) until a positioning tab is gripped by an elevation (35) and this positioning tab (12) or another strikes against a radially inward extension (36) of a side wall (23). In this end position of the lamp (5), the resilient tongues (16) with their contact surface (27) bear against the positioning tabs (12) of the lamp (5) and press the flange (11) against the inner edge portion (21) of the Locking ring (15). A projection (40) is formed on the side of the radially outwardly directed wall sections (22) opposite the edge section (24) of the resilient tongues (16), which extension extends up to the positioning tabs (12) of the lamp (5). The lugs (40) are rib-like and run below the free end of the tongues (16) from one side wall (23) to the other. There is therefore a gap between the edge section (24) of the resilient tongues (16) and the rib-like extension (40), through which the lamp (5) is positively guided when it is inserted with the positioning tabs (12) and therefore cannot be inserted at an angle. The lamp (5) is in its end position with its positioning tabs (12) not against the lugs (40), but with its flange (11) on the contact surface (26).

Der Reflektor (3) ragt mit den auf ihn aufgesetzten Arretierungsring (15) und der in den Arretierungsring (15) eingesetzten Lampe (5) aus einer in die Rückseite des Gehäuses (1) eingebrachten öffnung (37) heraus. Der zwischen dem Arretierungsring (15) und dem umlaufenden Rand der Öffnung (37) des Gehäuses (1) bestehende Spalt ist durch eine ringförmige Dichtung (38) abgedeckt. Die ringförmige Dichtung (38) verläuft in ihrem Querschnitt mäanderförmig und liegt mit ihrem inneren Rand unter Vorspannung an der Außenseite des zylindrischen Seitenrandes (32) des Arretierungsringes (15) an, während die ringförmige Dichtung (38) mit ihrem äußeren Rand dicht auf einen die Öffnung (37) des Gehäuses (1) umgebenden Kragen (39) aufgesetzt ist. Bei einem Wechsel der Lampe (5) ist diese auf der Rückseite des Scheinwerfers direkt zugänglich, weil keine die gesamte Öffnung (37) abdeckende kappenförmige Dichtung verwendet wird. Durch die im Querschnitt mäanderförmig ausgeführte Dichtung ist der Reflektor weiterhin leichtgängig verstellbar.The reflector (3) with the locking ring (15) placed on it and the lamp (5) inserted in the locking ring (15) protrudes from an opening (37) made in the rear of the housing (1). The gap between the locking ring (15) and the peripheral edge of the opening (37) of the housing (1) is covered by an annular seal (38). The annular seal (38) is meandering in cross-section and lies with its inner edge under prestress on the outside of the cylindrical side edge (32) of the locking ring (15), while the annular seal (38) with its outer edge is tight on one Opening (37) of the housing (1) surrounding collar (39) is placed. When the lamp (5) is replaced, it is directly accessible on the back of the headlight, because no cap-shaped seal covering the entire opening (37) is used. Thanks to the meandering seal, the reflector is still easily adjustable.

Der in den Figuren 5 und 6 dargestellte Scheinwerfer unterscheidet sich von dem in den Figuren 1 bis 4 dargestellten Scheinwerfer im wesentlichen dadurch, daß die federnden Zungen (16) in ihrer Längsausdehnung konzentrisch zur Längsachse der Lampe (5) verlaufen und jeweils an ihren Wurzeln (41) mit einer einzigen Seitenwand (23) mit der aus dem inneren Randabschnitt (21), den Wandabschnitten (22) und den Ringabschnitten (17) bestehenden ringförmigen Scheibe verbunden sind. Zumindest eine der Seitenwände (23) dient für einen Positionierungslappen (12) der Lampe (5) als Anschlag. Der an die ringförmige Scheibe angeformte Seitenrand (32) verläuft in einem Zylinder, an welchen die Zungen (16) mit ihrer radial nach außen gerichteten Schmalseite angrenzen. Die Seitenwände (23) sind in Richtung zum freien Ende der ihr benachbarten Zunge (16) hin verlängert und verlaufen mit dem Endabschnitt (45) ihrer Verlängerung am äußeren Rand der ringförmigen Scheibe entlang. An den Seitenrand (32) der schalenförmig ausgeführten, ringförmigen Scheibe ist ein in einem Abstand zum schalenförmigen Reflektor (3) verlaufender Randabschnitt (42) angeformt. An den Randabschnitt (42) sind vier Befestigungsmittel (43) angebracht, durch welche der Arretierungsring (15) an einem Traggestell (44) starr befestigbar ist. Die Befestigungsmittel (43) sind von in den Randabschnitt (42) eingebrachten Gewindebohrungen gebildet, in welche Schrauben mit ihrem Gewindeschaft eingreifen. Die Schrauben sind mit ihrem Gewindeschaft durch Bohrungen des Randabschnittes eines Traggestells (44) hindurchgestreckt und liegen mit ihrem Kopf an der Rückseite des Traggestells (44) an.The headlight shown in FIGS. 5 and 6 differs from the headlight shown in FIGS. 1 to 4 essentially in that the resilient tongues (16) extend concentrically to the longitudinal axis of the lamp (5) and their roots ( 41) with a single side wall (23) to which the annular disk consisting of the inner edge section (21), the wall sections (22) and the ring sections (17) are connected. At least one of the side walls (23) serves as a stop for a positioning tab (12) of the lamp (5). The side edge (32) molded onto the annular disk runs in a cylinder, on which the tongues (16) adjoin with their radially outwardly directed narrow side. The side walls (23) are extended in the direction of the free end of the tongue (16) adjacent to them and extend with the end section (45) of their extension along the outer edge of the annular disk. At the side edge (32) of the bowl-shaped, annular disc is one at a distance molded to the bowl-shaped reflector (3) edge portion (42). Four fastening means (43) are attached to the edge section (42), by means of which the locking ring (15) can be rigidly fastened to a support frame (44). The fastening means (43) are formed by threaded bores made in the edge section (42), into which screws engage with their threaded shank. The threaded shaft of the screws extends through bores in the edge section of a support frame (44) and its head rests against the back of the support frame (44).

BezugszeichenlisteReference list

Vorrichtung zur lösbaren Arretierung einer Lampe an einemDevice for releasably locking a lamp to a

Reflektor eines Fahrzeugscheinwerfers

1
Gehäuse
2
Abschlußscheibe
3
Reflektor
4
Öffnung
5
Lampe
6
Sockel
7
Glühwendel
8
Glaskolben
9
Gehäuseteil
10
Steckeranschluß
11
Flansch
12
Positionierungslappen
13
Ringdichtung
14
Hals
15
Arretierungsring
16
Zunge
17
Ringabschnitt
18
Befestigungsmittel
19
Rippe
20
Freimachung
21
Randabschnitt
22
Wandabschnitt
23
Seitenwand
24
Wandabschnitt
25
Randabschnitt
26
Anlagefläche
27
Auflauffläche
28
Rippe
29
Öffnung
30
Kragen
31
Ansatz
32
Seitenrand
33
Stifte
34
Abschnitt
35
Erhöhung
36
Verlängerung
37
Öffnung
38
Dichtung
39
Kragen
40
Ansatz
41
Wurzel
42
Randabschnitt
43
Befestigungsmittel
44
Traggestell
45
Endabschnitt
Reflector of a vehicle headlight
1
casing
2nd
Cover lens
3rd
reflector
4th
opening
5
lamp
6
base
7
Incandescent filament
8th
Glass bulb
9
Housing part
10th
Connector
11
flange
12th
Positioning tabs
13
Ring seal
14
neck
15
Locking ring
16
tongue
17th
Ring section
18th
Fasteners
19th
rib
20th
Franking
21
Edge section
22
Wall section
23
Side wall
24th
Wall section
25th
Edge section
26
Contact surface
27
Ramp area
28
rib
29
opening
30th
collar
31
approach
32
Margin
33
pencils
34
section
35
increase
36
renewal
37
opening
38
poetry
39
collar
40
approach
41
root
42
Edge section
43
Fasteners
44
Support frame
45
End section

Claims (16)

  1. A device for the detachable locking of a lamp (5) to a reflector (3) of a vehicle headlamp, having an opening (4) which is provided in the reflector (3) and which serves to receive a lamp (5) which can be passed through the opening (4) in the reflector (3), from the back of the reflector (3), with its glass bulb (8) in front and which has a base (6) with a surrounding flange (11) from which positioning rabs (12) extend radially outwards, and having a locking ring (15) which surrounds the opening (4) in the reflector (3) and which is fixed to the reflector (3), which locking ring is made of plastic on which resilient tongues (16) are integrally formed, between which the positioning tabs (12) of the lamp (5) can be passed and which engage above the positioning tabs (12) after a subsequent rotation of the lamp (5) about its longitudinal axis, wherein the positioning tabs (12) slide along a run-on face (27) of the tongues (16) until, in the final position of the lamp (5), the tongues (16) are seated under an initial stress against, the positioning tabs (12) and press the flange (11) of the base (6) against a contact face (26) oriented opposite to the direction of insertion of the lamp (5), characterised in that the locking ring (15) consists, as one piece, of the resilient tongues (16) and of an inner edge section (21) which extends between the resilient tongues (16) and the reflector (3) at a distance from the run-on faces (27) of the tongues (16), and the face of which inner edge section which faces the tongues (16) comprises the contact face (26) for the flange (11) of the base (6) of the lamp (5).
  2. A device according to claim 1, characterised in that an outer ring section (17) of the locking ring (15) extends between two adjacent tongues (16) and is offset towards the reflector (3), and the inner edge section (21) is integrally formed on the ring sections (17).
  3. A device according to claim 1 or 2, characterised in that the inner edge section (21) is of an encircling design, and radially outwardly oriented wall sections (22) thereof extend below the respective tongue (16).
  4. A device according to claim 3, characterised in that the wall sections (22) of the inner edge section (21) are formed from a one-piece annular disc which extends at a distance from the resilient tongues (16).
  5. A device according to claim 2 or 4, characterised in that the resilient tongues (16) are each attached to the annular disc which is disposed offset towards the reflector (3) by sidewalls (23), the inner faces of which, which adjoin the underside of the tongues (16), extend in such a way that they can be demouled, together with the underside of the tongues (16) and the face of the wall sections (22) facing the tongues (16), using an adjustable mould part which is adjusted radially outwards when the locking ring (15) is demoulded.
  6. A device acccording to claim 5, characterised in that for tongues (16) which have free ends which are oriented radially inwards, each tongue (16) is joined at the outer narrower edges of its root, via a sidewall (23), to the annular disc, and the inwardly oriented edges of the sidewalls (23) disposed between two tongues (16) extend into a rib (28) which joins them and which is integrally formed on the disc.
  7. A device according to claim 5 or 6, characterised in that at least one sidewall (23) is extended radially inwards by an amount such that the inner face of its extension (36) serves as a stop for a positioning tab (12) of the lamp (5) when the lamp (5) is in its final position.
  8. A device according to any one of claims 4 to 7, characterised in that the central opening (29) of the annular disc is surrounded by a collar (30) which is directed towards the reflector (3) and which extends into the opening in the reflector (3) substantially free from play, and the inner face of which serves for the radial fixation of the lamp (5).
  9. A device according to any one of the preceding claims, characterised in that the locking ring (15) on the annular disc has fixing means (18) by which it can be joined to the reflector (3).
  10. A device according to any one of claims 4 to 9, characterised in that the annular disc is of dish-shaped design, wherein the dish is open towards the reflector (3).
  11. A device according to claim 10, characterised in that the cylindrical lateral boundary (32) of the dish is seated with its free end section against the back of the reflector (3).
  12. A device according to claim 10 or 11, characterised in that the external surface of the lateral boundary (32) of the dish-shaped disc serves as a contact face (26) for an annular rubber cap (38) which surrounds the locking ring (15) under an initial stress, the outer surrounding edge of which rubber cap can be placed on an opening (37) in a housing (1) of the vehicle headlamp.
  13. A device according to any one of claims 1 to 12, characterised in that the resilient tongues (16) have an edge section (25) which is oriented opposite to the direction of insertion of the lamp (5) at their inwardly oriented free end.
  14. A device according to any one of claims 1 to 13, characterised in that the thickness of the resilient tongues (16) diminishes towards their free end.
  15. A device according to any one of the preceding claims, characterised in that resilient tongues (16) are each attached at their roots (41), by a single sidewall (23), to the annular disc, and the longitudinal extent of the resilient tongues extends concentrically with the longitudinal axis of the lamp (5).
  16. A device according to any one of the preceding claims, characterised in that fixing means (43), by which the locking ring (15) can be fixed to a supporting structure (44), are provided at the outer edge section (42) of the lateral boundary (32) of the dish-shaped, annular disc.
EP94110308A 1993-07-10 1994-07-02 Replaceable light bulb mounting to a vehicle headlamp reflector Expired - Lifetime EP0637715B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4323118 1993-07-10
DE4323118A DE4323118C1 (en) 1993-07-10 1993-07-10 Device for the releasable arrangement of a lamp on a reflector of a vehicle headlight

Publications (2)

Publication Number Publication Date
EP0637715A1 EP0637715A1 (en) 1995-02-08
EP0637715B1 true EP0637715B1 (en) 1997-04-23

Family

ID=6492486

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94110308A Expired - Lifetime EP0637715B1 (en) 1993-07-10 1994-07-02 Replaceable light bulb mounting to a vehicle headlamp reflector

Country Status (4)

Country Link
US (1) US5515245A (en)
EP (1) EP0637715B1 (en)
DE (2) DE4323118C1 (en)
ES (1) ES2103094T3 (en)

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US5010455A (en) * 1990-05-07 1991-04-23 General Motors Corporation Headlamp assembly
US5402325A (en) * 1993-12-28 1995-03-28 General Motors Corporation Vehicle headlamp assembly

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ES2103094T3 (en) 1997-08-16
US5515245A (en) 1996-05-07
DE4323118C1 (en) 1995-01-05
DE59402495D1 (en) 1997-05-28
EP0637715A1 (en) 1995-02-08

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