EP1734620B1 - Central contact for lamp socket - Google Patents

Description

The invention relates to a center contact for a bulb socket, formed from a one-piece stamped sheet metal part, with a connection portion for connecting an electric cable and an adjoining, designed as a flexurally elastic spring tongue contact portion for contacting an incandescent lamp holder incandescent lamp, wherein the spring tongue an S-shaped having formed base body, the terminal portion opposite the end portion carries a substantially perpendicular to the insertion of the light bulb in the bulb socket extending extension. Furthermore, the invention relates to a socket for an incandescent lamp, in particular for incandescent lamps with arranged on a lamp base bayonet pins, with a housing in which a set for fixing the lamp cap contact sleeve and a center contact for contacting with a bottom contact of the incandescent lamp are arranged.

Lampholders for incandescent lamps are known from the prior art as such, for example from the DE 297 05 866 , of the DE 694 09 592 T2 , or the DE 198 07 954 ,

The DE 297 05 866 describes a socket for incandescent lamps, which has a housing in which as a ground contact a contact sleeve on the one hand and a center contact on the other hand are arranged. The peculiarity of the embodiment described here lies in the design of the center contact. This is designed as a flexurally elastic spring tongue and has a substantially C-shaped configuration. The C-shaped configuration of the center contact has been well proven in practice, because an advantage of this embodiment is the low Space requirement in the transverse direction, that is transverse to the insertion of the light bulb. A disadvantage, however, caused by the C-shaped configuration of the center contact spring tongue caused little spring action in the insertion of the bulb so that an electrical contact between center contact on the one hand and bulb on the other hand is not ensured. In particular, not because the spring tongue over time, which leads to a decrease in the spring effect required for electrical contact with the bulb.

To counter this problem, it is out of the DE 694 09 592 T2 already known to form the spring contact forming the center contact S-shaped. Here, the S-shaped spring tongue is formed from two substantially perpendicular to the insertion of the light bulb in the socket extending spring legs, which are connected by a third spring leg S-shaped with each other. To connect an electric cable, a multi-angled contact strip connects to the S-shaped spring tongue, which extends from the spring tongue at right angles to the two transversely extending spring legs.

Although causes the S-shaped spring tongue after the DE 694 09 592 T2 a relation to the C-shaped spring tongue after the DE 297 05 866 improved spring action, but needed with the DE 694 09 592 T2 proposed design of the spring tongue disadvantageously a large space, since the entire spring tongue is intended as such deflected transversely to the insertion of the light bulb, which makes a lamp socket with comparatively large height and large diameter required. Consequently, in comparison to the light bulb to be received by the bulb after the DE 694 09 592 T2 proposed lamp holder in its design in a disadvantageous manner expansively large.

Generic center contacts are from the DE 23 19 522 B2 and the US 6,190,193 B1 known. But even here the proposed structures are designed in a disadvantageous manner expansively large, so that there is room for improvement.

The DE 198 07 954 discloses a center contact according to the preamble of claim 1.

Based on the above-described prior art, therefore, the invention provides the object, while avoiding the aforementioned disadvantages to propose a center contact for a light bulb socket, the formation of a simultaneously securing an electrical contact with a light bulb relative to their diameter relatively small bulb socket allows. In addition to be proposed with the invention, a socket for a light bulb.

To achieve this object, a center contact is proposed with the invention, which is characterized in that the S-shaped base body has a first and a second spring leg, both of which extend substantially parallel to the extension direction of the bulb into the bulb socket.

The spring contact forming the center contact has an S-shaped main body. As a result, compared to the C-shaped designed spring tongue after the DE 297 05 866 improved spring effect of the center contact achieved. In this case, the S-shaped configuration of the main body of the spring tongue provides a sufficiently large spring force even after frequent use, so that it is always ensured that the center contact for making electrical contact with an incandescent lamp is pressed against it.

The S-shaped base body carries an extension, which serves to make contact with the light bulb. Due to the arrangement of this extension, it is possible, the S-shaped base body compared to the embodiment of the DE 694 09 592 T2 in relation to the insertion direction of the incandescent lamp in the incandescent socket rotated by 90 ° to be arranged within the bulb socket, which has a reduced space and thus a size reduced in size bulb holder in an advantageous manner. According to the invention, the extension arranged on the S-shaped main body extends substantially at right angles to the insertion direction of the incandescent lamp into the incandescent lamp socket. It is arranged at the end region of the base body, which lies opposite the connection section. This embodiment makes it possible to arrange the S-shaped base body such that, in contrast to the embodiment according to the DE 694 09 592 T2 the two by a third spring leg S-shaped interconnected spring leg not transverse, but extend longitudinally to the insertion of the light bulb in the bulb socket. While ensuring an electrical contact with an incandescent lamp as an embodiment of the center contact is provided, which requires only a small space to accommodate within the bulb socket. A center contact designed according to the invention thus makes it possible for the Lamp holder in their design accordingly small form.

The design of the center contact according to the invention is a space-saving embodiment, with simultaneous provision of a long, acting in the insertion of the light bulb in the bulb socket spring travel, so that an electrical contact of an inserted into the bulb holder bulb is always ensured with the center contact. When inserting the incandescent lamp into the incandescent lamp holder, the contact with the bottom of the incandescent bulb is pressed down over the S-shaped main body of the spring contact forming the center contact. The restoring force of the resilient center contact ensures that the light bulb is held securely in its locked position within the bulb socket. Due to the long spring travel and high manufacturing tolerances in the length of the associated with the center contact lamp base can be accepted without malfunction.

It is inventively provided that the S-shaped base body has a first and a second spring leg, both of which extend substantially parallel to the insertion of the light bulb in the bulb socket. Unlike the embodiment after the DE 694 09 592 T2 Thus, the center contact according to the invention does not have a first and a second spring leg, which extend substantially perpendicular to the insertion of the light bulb in the bulb socket, so that it is for a proper deflection of the center contact of the invention compared to the Ausgestaltungssform after DE 694 09 592 T2 advantageously smaller space required. In particular, the diameter of the incandescent lamp holder according to the embodiment of the invention over the solution according to the DE 694 09 592 T2 reduce.

According to the invention, the first spring leg extending from the terminal portion opposite to the insertion of the light bulb into the bulb socket, whereas the second spring leg extends from the extension in the direction of insertion of the bulb into the bulb socket. According to this embodiment, the first spring leg and the second spring leg are spaced from one another in a plane extending parallel to the insertion direction of the incandescent lamp into the incandescent lamp holder. These two spring legs are by means of a third spring leg to S-shaped basic body according to the invention connected to each other. In this case, the third spring leg connects the end portion of the first spring leg, which is opposite to the terminal portion of the center contact, with the end portion of the second spring leg, which is opposite to the projection arranged thereon. In this way, an S-shaped base body is created, which is characterized by two spring legs, both of which extend substantially parallel to the insertion of the light bulb in the bulb socket.

According to the invention it is provided that the third and first spring legs on the one hand and the third and second spring legs on the other hand each included angle are equal. As a result, a uniform load in the case of deflection of the spring tongue is effected, so that the restoring force of the center contact ensures a secure electrical contact with the lamp base of the bulb. The angles enclosed by the spring legs are between 0 ° and 60 °, preferably between 30 ° and 60 °, more preferably between 40 ° and 50 °.

In order to prevent excessive bending of the spring tongue, that is, either of the S-shaped body or the extension arranged thereon when inserting the bulb, according to a preferred embodiment of the invention, a recess made in particular by deep drawing for receiving the ground contact of the bulb is formed on the extension , This recess is preferably formed conical in accordance with conventional bulb floor contacts. When inserting the bulb into the bulb socket, it is thus not a strong deflection of the spring tongue, since the ground contact of the bulb partially recording in this recess of the extension and receives an additional centering. In addition, a uniformly good contact of the incandescent lamp with the center contact is ensured by the cone-shaped depression.

According to a further feature of the invention, a through hole in the extension of the spring tongue is formed in the center of the recess. This embodiment is particularly advantageous when using incandescent lamps having a pronounced solder point arranged on the ground contact, since this solder point, which lengthens the length of the incandescent lamp, partially enters the through-hole and thus a further deflection and thus a strong plastic Deformation of the spring tongue is avoided.

In order for the center contact to find a secure hold within the bulb socket, the invention further proposes that the center contact can be fixed via latching devices within the bulb socket. These locking devices can be punched in an advantageous manner as a resilient extensions of the center contact forming, one-piece sheet metal stamping.

According to a further embodiment of the invention, the formed at the free end of the center contact terminal portion for connecting an electrical cable as a crimp terminal, insulation displacement contact, blade receptacle or flat blade is formed. Manufacturing technology, this embodiment is very advantageous because it is possible without additional contact elements to allow a direct connection of an electrical cable to the center contact.

The invention further proposes a socket for an incandescent lamp, in particular for incandescent lamps with bayonet pins arranged on a lamp base, with a housing in which a contact sleeve designed for fixing the lamp cap and a center contact for contacting a bottom contact of the incandescent lamp are arranged by a center contact according to the aforementioned features.

A socket for a light bulb with a center contact of the type according to the invention is characterized by its compact design, as described above. It is particularly advantageous that the version in comparison to that of the DE 694 09 592 T2 previously known lamp socket has reduced diameter.

According to a further feature of the invention, the contact sleeve carries a latching device, which makes it possible to arrange the contact sleeve positionally secure within the housing of the lamp socket. The latching device is preferably designed as a resilient extension, and from a one-piece stamped sheet metal part, which forms the contact sleeve, punched free.

The contact sleeve serves, for example, as ground contact and further has an integrally formed connection section for connecting an electrical cable, which is used as a crimp connection, insulation displacement contact, flat sleeve or flat blade is formed. The one-piece design is particularly advantageous for manufacturing reasons.

According to a further feature of the invention it is provided that the contact sleeve and the center contact of the insertion side of the incandescent lamp opposite side are inserted into the housing. Due to this embodiment, it is possible to connect the contacts already connected to electrical cables, for example via a crimping terminal, e.g. to insert the center contact and the contact sleeve, in the contacted state in the socket housing.

In order to avoid a short-circuit contact between the center contact and the contact sleeve, an insulating tongue formed integrally with the housing may be arranged in the interior of the housing.

It is particularly advantageous if, according to a preferred embodiment of the invention, the contact sleeve is formed as a one-piece stamped sheet metal part.

Fig. 1

einen erfindungsgemäßen Mittelkontakt in Seitenansicht;

Fig. 2

den erfindungsgemäßen Mittelkontakt nach Fig. 1 in einer Draufsicht von vorn;

Fig. 3

den erfindungsgemäßen Mittelkontakt nach Fig. 1 in einer Draufsicht von hinten;

Fig. 4

einen Längsschnitt durch eine erfindungsgemäße Glühlampenfassung;

Fig. 5

eine schematische Teilansicht eines Bodenkontakts einer Glühlampe mit am Bodenkontakt ausgeprägtem Lotpunkt und

Fig. 6

eine Darstellung gemäß Fig. 3, jedoch ohne ausgeprägten Lotpunkt.

Further details, features and advantages of the invention will become apparent from the following description with reference to FIGS. These show with

Fig. 1

a center contact according to the invention in side view;

Fig. 2

to the center contact according to the invention Fig. 1 in a plan view from the front;

Fig. 3

to the center contact according to the invention Fig. 1 in a plan view from behind;

Fig. 4

a longitudinal section through an incandescent lamp socket according to the invention;

Fig. 5

a schematic partial view of a ground contact of an incandescent lamp with pronounced at the ground contact solder point and

Fig. 6

a representation according to Fig. 3 , but without pronounced solder point.

The FIGS. 1 to 3 show the center contact 1 according to the invention in isolation, wherein Fig. 1 a side view, Fig. 2 a plan view in the viewing direction 33 and Fig. 3 is a plan view in the direction 34. Fig. 4 shows in a longitudinal section an incandescent lamp socket 2 according to the invention, which has a central contact 1 proposed by the invention.

The center contact 1 according to the invention, in particular the FIGS. 1 to 3 can be seen, formed from a one-piece stamped sheet metal part and has a connection portion 3 and a contact portion 4. The connection portion 3 is used to connect a in Figs. not shown electrical cable. The contact portion 4 is used for contacting with the ground contact 26 one in the FIGS. 1 to 3 also not shown bulb.

The ground contact 26 one in the FIGS. 1 to 3 not shown light bulb is schematically in the FIGS. 5 and 6 shown.

In the Fig. 4 illustrated bulb holder is used to hold a light bulb, not shown in this figure, at the lamp base 24 bayonet pins 25 are arranged for fixing the light bulb within the bulb socket 2. The FIGS. 5 and 6 let the lamp base 24 and the bayonet pins 25 arranged thereon recognize such incandescent lamps.

As is apparent from these FIGS. can be seen, the lamp base 24 carries a bottom contact 26, which, as will be explained later, after a proper insertion of the light bulb in the in Fig. 4 shown incandescent socket 2 with the arranged in the bulb holder 2 center contact 1 enters electrical connection. Like from the FIGS. 5 and 6 It can also be seen that there are in principle two different embodiments of ground contacts 26, namely one with a pronounced solder point 27 provided bottom contacts 26 - see Fig. 5 and bottom contacts 26 without pronounced solder point 27 - see Fig. 6 -. Depending on the embodiment of the ground contact 26 with or without pronounced soldering point 27, the total length of the incandescent lamp varies since according to DIN 49640 the distance A between the upper edge of the bayonet pin 25 and the lower edge of the ground contact 26 may vary by 1.6 mm.

In order to compensate for a variation including any manufacturing tolerances of the distance A between the upper edge of the bayonet pins 25 and the lower edge of the ground contact 26, and at the same time Ensuring the formation of an electrical contact between the center contact 1 on the one hand and the ground contact 26 of the light bulb on the other hand, the contact portion 4 of the center contact 1 is formed as a flexurally elastic spring tongue 5, as in the further reference to the FIGS. 1 to 3 is described.

The contact portion 4 of the center contact 1 is designed as a flexurally elastic spring tongue 5 and consists of a base body 6 on the one hand and an extension 7 on the other.

The main body 6 is S-shaped and has a first and a second spring legs 9 and 10, respectively. The two spring legs, that is, the first spring leg 9 and the second spring leg 10 extend substantially parallel to the insertion direction 12 of the incandescent lamp in the bulb socket 2, in particular Fig. 1 recognize. In this case, the first spring leg 9 extending from the terminal portion 3 opposite to the insertion direction 12 of the bulb into the bulb socket 2, whereas the second spring leg, starting from the extension 7 in the direction of insertion 12 of the bulb into the bulb socket 2 extends.

How out Fig. 1 The third spring leg 11 connects the first spring leg 9 with the second spring leg 10. In this way, an S-shaped arrangement of the spring leg 9, 10th and 11 created, which form the S-shaped body.

How out Fig. 1 it can also be seen that the first spring leg 9 and the third spring leg 11 enclose an angle α. The second spring leg 10 and the third spring leg 11 enclose an angle β. The angles α and β are the same size and follow in the embodiment Fig. 1 a size of about 45 ° each.

The S-shaped base body 6 carries at its end portion opposite the terminal 3 a substantially perpendicular to the insertion of the light bulb 12 in the bulb socket extending extension 7. This extension 7 is at a plugging a bulb in the bulb socket with the ground contact 26 of the bulb in electrical Connection.

The extension 7 carries on its side opposite the incandescent lamp holder 2 incandescent bulb preferably a conically shaped recess 8. In this recess 8 engages the bottom contact 26 of an incandescent lamp holder 2 used, so that the center contact 1 is centered relative to the bulb holder 2 ,

In the Fig. 4 illustrated bulb socket 2 consists of a housing 17, in which a contact sleeve 18 and in the FIGS. 1 to 3 separately shown center contact 1 are arranged for electrical contacting of an incandescent lamp inserted into the housing 17. The designed as an open, tubular sleeve contact sleeve 18, which serves as a ground contact, for example, is provided with Arretierungs-, ie bayonet receptacles 23 which serve to receive the arranged on the lamp base 24 bayonet pins 25 and thus for fixing the light bulb within the housing 17. While the electrical connection between the incandescent lamp and the contact sleeve 18 takes place automatically when fixing the incandescent lamp via the metallic housing of the lamp cap 24, it is necessary for contacting with the center contact 1 that a bottom contact 26 of the incandescent lamp with the center contact 1 occurs. As already on the basis of FIGS. 1 to 3 executed, the center contact is formed as a simple, formed from a one-piece sheet metal stamping by successive bending and punching spring tongue 5, which has a contact portion 4, which is formed of an S-shaped base body 6 and an extension 7 arranged thereon. For contacting with the ground contact of the bulb provides the extension 7 of the spring tongue 5, which is bent at right angles in the contact area with the light bulb, that is perpendicular to the insertion direction 12 of the bulb into the bulb socket 2, so that the contact area with the ground contact 26th runs approximately horizontally to the ground contact 26. Due to the design of the center contact 1 as flexurally elastic spring tongue 5, the center contact 1 can be pressed when inserting the light bulb in the socket 2 in the insertion 12 of the light bulb in the housing 17 down. Due to the restoring force of the spring tongue 5, the light bulb used in the bayonet receptacles 23 of the contact sleeve 18 is held with sufficient contact pressure in this locked position.

For electrical contacting of the contact sleeve 18 and the center contact 1 with one in Fig. 4 electrical cables, not shown, are formed on the facing away from the bulb free ends of both the contact sleeve 18 and the center contact 1 integral connecting portions. In the illustrated embodiment, the terminal portion have crimp terminals and each have a crimping portion 29 and 31 and a holder 30 and 32, respectively. The electrical contacting of an incandescent lamp used in the incandescent lamp holder 2 thus takes place firstly via the center contact 1, which bears with its extension 7 or the recess 8 formed thereon at the bottom contact 26 of an incandescent lamp and the other via the contact sleeve 18, via the contact region 28th , who also carries the bayonet mount 23, the lamp base 24 of the light bulb is applied

To set the contact sleeve 18 and the center contact 1 in the housing 17 resiliently snap-in devices 13 and 14 are punched out of the preferably produced as one-piece sheet metal stamped contacts 18 and 1, in the mounted state of the bulb holder 2 with the arranged inside the housing 17 projections 15th or 16 snap together interact. In order to be able to release the contacts 18 or 1 again, openings are formed in the housing 17 in the area of the latching devices 13 or 14, via which the latching devices 13 and 14 can again be disengaged from the projections 15 and 16, respectively that the contacts 18 and 1 can be pulled out of the housing 17 of the bulb holder 2 again.

How to continue Fig. 4 it can be seen, the housing 17 in the interior of the bulb socket having an integrally formed with the housing 17 insulating tongue 20 to prevent a short-circuit contact between the center contact 1 and the contact sleeve 18.

• Zunächst werden die Kontakthülse 18 und der Mittelkontakt 1 jeweils aus einem einstückigen Blechstanzteil durch aufeinanderfolgende Stanz- und Biegevorgänge hergestellt. Am freien Ende der Kontakthülse 18 sowie des Mittelkontakts 1 werden zum Anschluß von den in den Fign. nicht dargestellten elektrischen Kabeln im Zuge dieser Stanz- und Biegevorgänge als Crimp-Anschlüsse ausgebildete Kontaktierelemente ausgebildet. Anschließend werden an den Crimp-Anschlüssen sowohl der Kontakthülse 18 als auch des Mittelkontakts 1 die elektrischen Kabel festgelegt. Die somit jeweils mit einem elektrischen Kabel verbundenen Kontakte 18 bzw. 1 werden nachfolgend von der Einsteckseite für die Glühlampe gegenüberliegende Seite in das Gehäuse 17 der Fassung 2 so weit eingeschoben, bis die Rasteinrichtungen 13 bzw. 14 die am Gehäuse 17 ausgebildeten Vorsprünge 15 bzw. 16 hintergreifen und unverrückbar im Gehäuse 17 festgelegt sind. Nach Beendigung dieser Arbeitsschritte ist die Glühlampenfassung 2 fertig zur Aufnahme einer Glühlampe, wobei es sich bei diesen Glühlampen sowohl um normale Glühdrahtlampen als auch über Halogen-Glühlampen handeln kann.

The assembly of an in Fig. 4 illustrated bulb socket and the insertion of a light bulb in such a version 2 is carried out as follows:

• First, the contact sleeve 18 and the center contact 1 are each made of a one-piece stamped sheet metal part by successive punching and bending operations. At the free end of the contact sleeve 18 and the center contact 1 are for connection of the in Figs. electrical cables, not shown, formed in the course of this punching and bending operations as crimp terminals formed Kontaktierelemente. Subsequently, at the crimp terminals of both the contact sleeve 18 and the center contact 1, the electrical cable established. The thus each connected to an electrical cable contacts 18 and 1 are subsequently inserted from the Einsteckseite for the incandescent lamp opposite side into the housing 17 of the socket 2 until the locking devices 13 and 14 formed on the housing 17 projections 15 and 16 engage behind and immovable in the housing 17 are fixed. After completion of these steps, the bulb holder 2 is ready to receive an incandescent lamp, these bulbs can be both normal Glühdrahtlampen and halogen bulbs.

A inserted into the bulb socket 2, provided with bayonet pins 25 plug-in light bulb is inserted into the housing 17 so that the formed on the lamp base 24 of the bulb bayonet pins 25 find in insertion channels provided with the bayonet receptacle 23 contact sleeve 18 recording. This mere insertion of the bulb without pressure ends at the moment in which the ground contact 26 of the bulb rests on the center contact 1. Since it is not possible in this position, the light bulb to rotate relative to the contact sleeve 18 so that the bayonet pins 25 can enter into undercuts of the bayonet mount 23, it is first necessary, the incandescent lamp against the spring force of the center contact 1 further into the interior of the Housing 17 of the socket 2, and indeed until it is possible to turn the bulb so far relative to the contact sleeve 18 that the bayonet pins 25 find in the undercuts of the bayonet mount 23 of the contact sleeve 18 recording. Due to the restoring force of the flexurally elastic spring tongue of the center contact 1, the incandescent lamp, biased against the insertion direction 12, is securely held in the undercuts of the bayonet mount 23.

To remove the bulb from the bulb socket 2, it is again necessary to push the bulb against the spring force of the center contact 1 in the housing 17 to bring the bayonet pins 25 out of engagement with the undercuts of the bayonet mount 23.

The incandescent lamp holder 2 itself can be introduced into a holder provided for this purpose via catches 19 arranged externally on the housing 17.

Of particular advantage of the above-described bulb holder is the fact that the center contact 1 has an S-shaped base body 6, whose first spring leg 9 and second spring leg 10 is in Plug insertion 12 of the light bulb into the bulb socket 2 extend. In this way, a particularly space-saving arrangement of the center contact 1 is achieved, which allows a total small size of the bulb holder 2. In addition, a bulb holder 2, as in Fig. 4 is shown, simple and inexpensive to manufacture, since both the contact sleeve 18 and the center contact 1 are formed as a simple one-piece bending punched parts. <B><u> REFERENCE LIST </ u></b> 1 center contact α angle 2 bulb socket β angle 3 connecting section A distance 4 Contact section 5 spring tongue 6 body 7 extension 8th deepening 9 first spring leg 10 second spring leg 11 third spring leg 12 insertion 13 locking device 14 locking device 15 head Start 16 head Start 17 casing 18 contact sleeve 19 latching 20 Isolierzunge 23 bayonet recording 24 lamp base 25 bayonet pin 26 ground contact 27 Perpendicular 28 contact area 29 Crimping range 30 bracket 31 Crimping range 32 bracket 33 line of sight 34 line of sight

Claims (13)

1. A central contact for a bulb socket (2), formed by a single-piece sheet metal stamping, comprising a connection section (3) for the connection to an electric cable and a contact section (4) which joins said connection section (3) and which is configured as a flexible spring tongue (5) for contacting a bulb received by the bulb socket (2), wherein the spring tongue (5) comprises an S-shaped base body, the end portion of which opposite the connection section (3) carries an extension (7) which essentially extends at right angles to the direction of insertion (12) of the bulb into the bulb socket (2), wherein
   the S-shaped base body (6) is composed of three contact tongues (9, 10, 11), wherein a first and a second contact tongue (9, 10) essentially extend in parallel to the direction of insertion (12) of the bulb into the bulb socket (2), and the third contact tongue (11) connects the first contact tongue (9) to the second contact tongue (10), characterized in that the angles (α, β) which are respectively formed by the third and first contact tongues (11, 9), on the one hand, and by the third and second contact tongues (11, 10), on the other hand, are equal in size, wherein the angles (α, β) which are respectively formed by the contact tongues (9, 10, 11) are comprised between 0° and 60°.
2. A central contact according to claim 2, characterized in that the first contact tongue (9) extends from the connection section (3) in the opposite direction of the direction of insertion (12) of the bulb into the bulb socket (2).
3. A central contact according to claim 1 or 2, characterized in that the second contact tongue (10) extends from the extension (7) into the direction of insertion (12) of the bulb into the bulb socket (2).
4. A central contact according to one of the preceding claims, characterized in that the extension (7) comprises a preferably conical recess (8).
5. A central contact according to claim 4, characterized in that a through bore is formed in the centre of the recess (8).
6. A central contact according to one of the preceding claims, characterized in that the first contact tongue carries a snap-in device (13).
7. A central contact according to one of the preceding claims, characterized in that the connection section (3) is configured as a crimp connector, an insulation displacement contact, a blade receptacle or a flat blade.
8. A socket for a bulb (2), in particular for bulbs comprising bayonet pins (25) arranged on a lamp socket (24), comprising a housing (17) in which a contact sleeve (18) designed for fixing the lamp socket (24) as well as a central contact (1) for contacting a bottom contact (26) of the bulb are arranged, characterized by a central contact (1) according to one of the preceding claims 1 through 7.
9. A socket according to claim 8, characterized in that the contact sleeve (18) carries a snap-in device (14).
10. A socket according to claim 8 or 9, characterized in that the contact sleeve (18) comprises a connection section for the connection to an electric cable, which connection section is configured as a a crimp connector, an insulation displacement contact, a blade receptacle or a flat blade.
11. A socket according to one of the preceding claims 8 through 10, characterized in that the contact sleeve (18) and the central contact (1) can be inserted into the housing (17) from the side opposite the insertion side of the bulb.
12. A socket according to one of the preceding claims 8 through 11, characterized in that an insulation tongue (20) which is formed integrally with the housing (17) is arranged on the inner side of the housing (17).
13. A socket according to one of the preceding claims 8 through 12, characterized in that the contact sleeve (18) is formed by a single-piece sheet metal stamping.

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