EP0269539A2 - Disengageable snap coupling between a light bulb and its fitting - Google Patents

Abstract

The coupling is characterised in that the connecting force between the bulb and its base or socket or electrical contact support, single or composite, is a magnetic attraction force between a part provided in the bottom of the receptacle of the base, socket, support or otherwise, and another part disposed on the rear face of the cap of the bulb, the said parts being capable of magnetic attraction, the said cap and the socket possessing corresponding centring structures permitting the orientation and the passage of the electrical contacts. This invention is of interest to manufacturers and constructors of bulbs, lamps and lighting equipment. <IMAGE>

Description

The present invention relates to a light bulb and simple or composite socket assembly with coupling and holding by magnetic attraction.

There are essentially two known methods of attachment between a light bulb and its socket. These are first of all the fixings in the socket for which the base of the bulb and the receptor structure of the socket are screw shaped. The bulb therefore comes to be screwed by its base into the socket.

Then there are the so-called bayonet fasteners. According to this method of attachment, the cylindrical base of the bulb is engaged in the receptor structure of the socket by guide notches arranged opposite. The first part of the notch is a vertical slot constituting a guide for the presentation and the angular position of the base relative to spring pins. The second part offset laterally ensures compression maintenance of the springs. The bulb is definitively put in place by vertical pressure with longitudinal thrust on the spring pins until the bottom of the slot. The slots are continued laterally each by a notch allowing the immobilization of the bulb after a slight rotation on itself. The bulb is then fixed in the correct electrical contact position in which the studs on the base bear on the ends of the spring studs.

The screw fixings require the installation, the practice of many rotations of the bulb which is a fragile object. To ensure the rotational movement, immobilize the body of the socket with the other hand with the apprehension of a possible electric shock.

It is the same for the unscrewing which presents, in addition, sometimes, seizing due to a defor mation by heating or oxidation.

Furthermore, the exposure time proves to be long and delicate due to the positions of the operator's body which can be acrobatic.

Bayonet fasteners, if they seem more practical and quicker, on the other hand, still have the same major drawbacks of requiring the use of both hands: holding the body of the socket with one hand and the bulb with the other .

In addition, it is necessary to operate a relatively strong thrust against the action of the spring pins before engaging the pins in the retaining notches. In addition, this thrust must be maintained at the start of the rotation of the bulb.

In addition, if the glass of the bulb is broken, the extraction operation becomes frankly dangerous.

In addition, when the bulb is removed, unscrewed or detached, the electrical risk represented by the accessibility of the contacts under voltage is significant and remains so throughout the intervention unless the electrical connection can be disconnected.

The object of the present invention is to remedy these various drawbacks.

To this end, it relates to the separable coupling between a light bulb and its base or socket, characterized in that the bonding force between the bulb and its base or socket or support for electrical contacts, simple or composite, is a magnetic attraction force between a part provided at the bottom of the receptacle of the base, socket, support or other, and another part arranged on the rear face of the base of the bulb, said parts being susceptible of magnetic attraction , said base and the socket having corresponding centering structures allowing the orientation and the passage of the electrical contacts.

The present invention has numerous advantages, the main ones of which will be mentioned below:
. the fitting of the bulb does not require any physical effort either for the engagement of the base in the socket, or for the maintenance thereof, due to the magnetic attraction;
. the movement can be carried out with one hand without immobilizing the sleeve;
. the socket becomes technically simple and easy to produce during manufacture: it is a simple receptacle sleeve carrying a magnetic part and two supply pads;
. ease, speed and security of assembly and disassembly by simple engagement in or disengagement of the socket;
. angular prepositioning of the bulb ensuring the angular presentation of the contact;
. quick, simple and easy presentation and introduction of the bulb which is carried out directly and effortlessly;
. the bulb is snapped up by the magnetic attraction towards the electrical contacts providing mechanical assistance for magnetic retention;
. simple and efficient guiding towards the electrical contacts;
. electrical contact always perfect because independent of the installation of the bulb;
. optimal magnetic hold improved by mechanical pressure;
. simplicity of implementation;
. risk of electrocution eliminated due to recessed electrical contacts;
. perfect electrical contact which allows the transmission of powers greater than those used in lighting;
. simplicity and economy of manufacture of the bulb and the socket.

• . La figure 1 est une vue en coupe longitudinale d'une douille à vis équipée d'une pièce d'adaptation formant douille à fixation rapide ;
• . La figure 2 est une vue en coupe longitudinale d'une douille à baïonnette équipée d'une pièce d'adaptation formant douille à fixation rapide ;
• . la figure 3 est une vue en coupe longitudinale d'une douille complète de conception nouvelle conforme à l'invention ;
• . la figure 4 est une vue générale en perspective dite "éclatée" d'une ampoule et sa douille avec contacts en retrait ;
• . la figure 5 est une vue en perspective de l'ampoule et, plus particulièrement, de son culot avec contacts à extrémités en bourrelet ;
• . la figure 6 est une vue en coupe longitudinale de l'ampoule ;
• . la figure 7 est une vue en coupe longitudinale de la douille selon la figure 4 équipée de son ampoule ;
• . la figure 8 est un agrandissement en perspective sur une des zones de contact électique montrant les pièces complémentaires de contact selon une variante de réalisation ;
• . la figure 9 est une vue en plan du culot de l'ampoule selon la figure 4 ;
• . la figure 10 est une vue générale en perspective dite "éclatée" de l'ensemble ampoule-pièce d'adaptation-­douille dans sa version pour utilisation avec douille classique à baïonnette ;
• . les figures 11 et 12 sont des vues en coupe trans­versale représentant le culot de l'ampoule enfiché dans la pièce d'adaptation elle-même montée dans une douille classique repsectivement à baïonnette puis à vis ;
• . la figure 13 est une vue en perspective d'une ampoule avec contacts électriques du type à lamelles ou à lames ;
• . la figure 14 est une vue fragmentaire en coupe longi­tudinale au niveau d'un contact électrique du type à lamelles et maintien par pincement linéaire ;
• . la figure 15 est une vue fragmentaire en coupe longi­tudinale au niveau d'un contact électrique du type à lamelles et maintien par pincement plan ;
• . les figures 16, 17 et 18 sont des vues fragmentaires en coupe longitudinale de variantes de contacts à pinces à une seule mâchoire avec appui contre le chant adjacent de l'aimant ;
• . la figure 19 est une vue en perspective d'un culot avec contacts électriques cylindriques du type enfi­chables ;
• . la figure 20 est une vue schématique en perspective représentant un aimant cylindrique occupant tout le fond de la douille et traversé par les pièces de contact électrique ;
• . la figure 21 est une vue schématique en perspective du même type d'aimant avec passage des contacts près de la périphérie ;
• . la figure 22 est une vue en perspective d'une ampoule à culot avec méplats, contacts à lamelles et pièce d'attraction noyée dans la masse du culot ;
• . la figure 23 est une vue en perspective simplifiée d'un culot à vis avec contacts en retrait à rapporter sur l'ampoule représentée sur la figure 22 ;
• . la figure 24 est une vue en perspective simplifiée d'une douille intégrée à utiliser avec l'ampoule représentée sur la figure 22.

The present invention will be better understood on reading the description which follows, given by way of nonlimiting example with reference to the accompanying drawings in which

• . Figure 1 is a longitudinal sectional view of a screw socket fitted with an adapter piece forming a quick-fitting socket;
• . Figure 2 is a longitudinal sectional view of a bayonet socket fitted with an adapter piece forming a quick-fixing socket;
• . Figure 3 is a longitudinal sectional view of a complete socket of new design according to the invention;
• . Figure 4 is a general perspective view called "exploded" of a bulb and its socket with recessed contacts;
• . FIG. 5 is a perspective view of the bulb and, more particularly, of its base with contacts with bead ends;
• . Figure 6 is a longitudinal sectional view of the bulb;
• . Figure 7 is a longitudinal sectional view of the socket according to Figure 4 equipped with its bulb;
• . FIG. 8 is an enlargement in perspective on one of the electrical contact zones showing the complementary contact parts according to an alternative embodiment;
• . Figure 9 is a plan view of the base of the bulb according to Figure 4;
• . Figure 10 is a general perspective view called "exploded" of the bulb-adapter-socket assembly in its version for use with conventional bayonet socket;
• . Figures 11 and 12 are cross-sectional views showing the base of the bulb plugged into the adapter piece itself mounted in a conventional socket respectively bayonet then screws;
• . Figure 13 is a perspective view of a bulb with electrical contacts of the lamella or blade type;
• . FIG. 14 is a fragmentary view in longitudinal section at the level of an electrical contact of the lamella type and held by linear pinching;
• . FIG. 15 is a fragmentary view in longitudinal section at the level of an electrical contact of the lamella type and held by plane pinching;
• . Figures 16, 17 and 18 are fragmentary views in longitudinal section of alternative clamp contacts with a single jaw bearing against the adjacent edge of the magnet;
• . Figure 19 is a perspective view of a base with cylindrical electrical contacts of the plug-in type;
• . Figure 20 is a schematic perspective view showing a cylindrical magnet occupying the entire bottom of the sleeve and traversed by the electrical contact parts;
• . Figure 21 is a schematic perspective view of the same type of magnet with passage of the contacts near the periphery;
• . FIG. 22 is a perspective view of a base bulb with flats, lamella contacts and attraction part embedded in the mass of the base;
• . Figure 23 is a simplified perspective view of a screw base with recessed contacts to be attached to the bulb shown in Figure 22;
• . FIG. 24 is a simplified perspective view of an integrated socket for use with the bulb shown in FIG. 22.

The general inventive idea consists in providing, as a bonding force between the bulb and the bottom of the socket, of the base or any other electrical contact support, a magnetic attraction force which keeps the faces of the base and the socket connected to one another in correspondence, by ensuring the orientation of the contacts, the mechanical transmission of the rotational movement and the electrical connection, that is to say the correspondence between the electrical contacts.

A first embodiment of the invention will firstly be described below with reference to FIGS. 1 and 2, according to which the contacts are apparent allowing direct use of the existing bulbs and socket.

In general, the rapid attachment according to the invention between a light bulb 1 and its base or socket 2 has a cylindrical receptacle 3 in which the base 4 of the bulb 1 comes to be more or less deeply inserted.

The base 4 is smooth or provided with centering pins 5 and 6 in the manner of conventional bases of bayonet bulbs.

The receptacle 3 has at its bottom electrical contacts 7 and 8 electrically connected to the neutral and to the phase of the sector.

In the base of the housing, in the central position, between the electrical contacts 7 and 8, there is a magnetized part or magnet 9 or any equivalent, capable of generating a magnetic attraction.

Opposite, on the rear face 10 of the base between the studs 11 and 12, in the middle part, is secured by any means, for example by bonding, a metal strip or plate 13 capable of being attracted by the magnetic part 9 or any other equivalent.

Of course, the parts 9 and 13 can be reversed.

The base is attracted to the bottom of the receptacle by the force of the magnet on the bar or metal plate 13. In order to ensure the correct presentation of the bulb, that is to say the perfect correspondence of the contacts and electrical studs, it will be possible to keep the pins 5 and 6 of the bayonet bulbs which will cooperate with guide structures in the form of longitudinal grooves 14 and 15 provided in the walls of receptacle 3 or any other equivalent.

The height of the bar or the thickness of the plate 13 will be chosen so as to obtain a free thrust contact, that is to say so as to constitute a stop between the studs 11 and 12 and the electrical contacts 7 and 8 It goes without saying that the stop on the contacts will take place before the contact of the metal strip or plate 13 on the magnetic part 9.

Although, for reasons of available space, it is preferable to incorporate the magnetic part 9 or magnet in the bottom of the receptacle 3, it is quite possible to reverse place the magnet on the rear face. 10 of pellet 4.

We will now examine the different possible forms of the prologation 16 of the receptacle 3.

First of all, a distinction is thus made (FIG. 1) an extension 16 in a hollow or full body 17 of generally cylindrical shape with a lateral surface shaped in thread 18 adapting perfectly to a conventional screw socket 19. The body 17 will hang on its base 20 a central stud 21 electrically connected to the contact 7 and pressing on the tab 22 of the socket bottom. The other contact is made at the level of the inlet neck 23 of the socket connected in principle to the electrical neutral of the sector.

The hollow body has on its outer shoulder 24 a similar contact piece, for example an annular 25, connected to the other contact 8.

There is then distinguished (FIG. 2) an extension 16 shaped as a cylindrical body 26, the lateral surface of which is provided with two transverse pins. centering 27 and 28 diametrically opposite, engaging in the notches 29 and 30 of a conventional socket 31 with bayonet.

The receptacle bottom contacts 7 and 8 are electrically connected to other studs 32 and 33 facing them, situated on the opposite base of the cylindrical body 26. These studs are in mechanical thrust contact with the spring studs 34 and 35 from bayonet socket 31.

An intermediate socket has thus been produced which is mounted on the conventional socket with screw or bayonet like a bulb. This intermediate socket remains permanently part of the bulb holder support.

Finally, there is a distinction (FIG. 3) of the perfect integration of the intermediate socket with the socket itself. In this embodiment, the receptacle 3 constitutes the housing for holding the base 4 of the bulb without an intermediate part like a complete socket. The bottom of the receptacle has contacts 36 and 37 separated by a central magnetic piece 38, for example a magnet stuck in a central housing 39.

The contacts 36 and 37 are connected to pieces for holding the incoming wires, for example wire clamps 40 and 41.

A possible protective cap 42 can be provided at the rear with an outlet, for example with a grommet 43.

Guiding is carried out by the two diametrically opposite longitudinal grooves such as 14 and 15 provided on the internal face of the sleeve constituting the lateral surface of the receptacle.

As a variant, the pins 5 and 6 may be constituted by the ends of the bar or metal plate 13 which would extend sufficiently beyond the limit of the side wall of the base 4. For this purpose, it is imagined to use bars 13 of circular section (Figure 3).

These will have a length greater than the diameter of the base and their ends projecting on either side of the side wall of the base will serve as centering pins.

We will now refer to Figures 4 to 8 showing a bulb and a socket according to another embodiment.

This variant comprises a bulb 44 of general shape identical to those commonly existing in commerce, the base of which can be reduced to a simple extension of the glass of the bulb.

The bulb 44 has a base 45 of generally cylindrical shape with one or two opposite cut faces or flats 46 and 47 providing orientation and guiding as soon as it enters the socket. The base ends with a base 48 coated with a metal plate 49 or magnetized occupying practically the entire surface of the front section of the base. This metal plate can be a magnet. If necessary, it is electrically isolated from the electric circuit of the bulb by the mass of the body 50 of the base preferably made of a synthetic material or glass, in the very material of the bulb-shaped body of a pear.

The flats 46 and 47 are intended to ensure the orientation of the bulb, that is to say its correct presentation during its introduction into the socket. They play the role, with their counterparts of the socket, of orientation and guiding device as well as of socket for the mechanical transmission of the screwing movement during the fitting of the bulb. It therefore suffices to fit the base of the bulb into the socket to obtain immobilization in rotation and the exact correspondence between the contact parts.

The flats 46 and 47 present over the entire height of the base terminate on the front face of its base 48 by two opposite contact carrier zones 51 and 52 of minimum surface so as to leave the maximum surface for the metal plate or the magnet 49. The latter has, of course, corresponding clearance cutouts 53 and 54. The metal plate 49 is secured to the base of the base by bonding or any other means.

The contact parts carried by the bulb are of various shapes, for example in a first embodiment, of the type with blades or strips 55 and 56 each constituted by a metallic plane perpendicular to the front surface of the base. The lamellae 55 and 56 are parallel to each of the edges of the adjacent flats 46 and 47. According to a first variant, they comprise a linear bead end 57 and 58 forming local allowance. These contacts are electrically connected through the base and the rod 59 of the bulb by two electric wires 60 and 61 constituting, with the filament 62, the electric circuit of the bulb.

Of course, the electric circuit of the bulb and the metal plate 49 are suitably electrically insulated (Figure 6).

The invention also includes a socket 63 or an adaptation piece 64.

The socket 63 has a complementary receiving shape forming a cavity or a housing 65 in which is fitted the base of the bulb. The general shape of this housing is that of a cylindrical cavity whose lateral surface has one or two planes 66 and 67 opposite parallel to the axis 68 of the cavity 65 corresponding to the flats 46 and 47.

The axes 68 and 69 of the cavity 65 and of the base 45 merge when the bulb is inserted into its socket.

As indicated, the contacts are retained by a mechanical force, for example lateral pressure, in particular a pressing or pinching force acting on either or on one or the other of the faces of the contact parts of the bulb, for example lamellae 55 and 56.

This gripping force is provided by complementary contact pieces 70 and 71 shaped as clamps, provided in correspondence at the bottom of the socket 63 or of the adaptation piece 64 on either side or of the central part of a magnet or a magnetized part 72, for example parallelepiped or cylindrical, occupying the majority of the surface of the bottom of the socket.

These complementary contact pieces 70 and 71 are likely to have various shapes, from the clamp exerting its pressure on a linear zone to holding by pressure over a greater flat area. In addition, various forms of jaws are provided: convex or flat pressure zone.

Three embodiments will be described. We cannot describe them all. It is understood that the derivative or equivalent forms fall perfectly within the scope of the invention.

In a first type of embodiment shown in FIGS. 8, 14 and 15, each of the complementary contact pieces is formed from two parallel metal blades 73 and 74 joined at the end and shaped as a square, the upward extension of which is bent at right angle to the median plane of the socket forming a wing 75 providing the offset necessary for the resumption of contact by a connecting piece 76 or 77 with the electrical wires 78 and 79 inside the body of the socket.

The downward extension forms a clamp with identical jaws. There are, for example, jaws shaped according to two semi-cylindrical shapes 80 and 81 intended to grip the electrical contacts of the bulb terminated in the form of beads (figure 8).

In order to facilitate penetration of the bead into the space between the two jaws, the end edges 82 and 83 of the two jaws are bent outward. The inflection zone 84 and 85 causes the gradual spacing of the jaws, facilitating the penetration of the bead-shaped end.

The spring effect of the metal blades generates elastic return forces when the jaws of low value are brought together. We are simply looking for maintenance assistance.

In this spirit, it should be considered that the only magnetic attraction force must be able to open the jaws easily, that is to say to overcome the elastic return forces in bringing the jaws together.

Of course, it is possible to envisage a variant with a single jaw in which only a lateral half-surface of the bead is received in the receiving shape of the single jaw.

The curved edge facilitates the spacing of the jaw from its rest position and the penetration of the bead. The bead can bear for its opposite lateral surface against the adjacent edge of the magnet 72.

There are also two modes of pliers particularly well suited for maintaining the electrical contacts of the bulb shaped strips (Figures 8, 14 and 15).

A first embodiment (FIG. 14) relates to jaws profiled in "S", 86 and 87, with convex area, contact making a pinching on a straight area of small width.

The blades constituting the jaws each have an outwardly curved edge constituting a converging entry volume 88.

A second embodiment (FIG. 15) relates to a plane nipping provided by straight blades 89 and 90 forming the pliers in elastic reconciliation towards one another. The outwardly curved lower edges constitute a converging inlet volume 91 for the flat contact parts of the bulb.

Various forms of entry are possible.

A typical example of the shapes of the complementary contact parts is shown in FIGS. 16, 17 and 18.

These variants only have a single nipping blade with contact over a more or less extended area by planar contact (Figures 16 and 17) or enveloping (Figure 18).

The blade shapes are those derived from the pliers described above.

We can use the adjacent edge of the magnet or the magnetized part as a guide and support plane.

According to another variant (FIG. 19), the contact pieces carried by the base 45 of the bulb can be of the cylindrical type, for example rods such as 92 and 93 solid or hollow pluggable into corresponding sockets 94 and 95 split, slightly pinch effect.

These sockets act as complementary contact parts existing at the bottom of the socket.

It should be noted that the pinching is weak, it is simply a question of improving the magnetic retention.

Furthermore, one can consider magnets 72 of the bottom of the socket of various shapes and maximum surface area. To illustrate the non-limiting nature of this invention, there are shown in Figures 20 and 21 cylindrical magnets occupying the entire section of the bottom of the bulb.

Made of material known under the name tion "ferrite" they prove to be perfect electrical insulators and, consequently, can be put directly in contact with the complementary parts of contact of bottom of socket.

The shapes shown relate to two basic variants.

According to the first variant (FIG. 20), the body of the magnet 72 has passages 96 and 97 crossed by the complementary contact parts of the bottom of the socket, for example the sockets 94 and 95.

According to the second variant (FIG. 21), the passages are open slots, grooves or grooves 98 and 99 along the lateral surface, grooves lined, for example at the bottom of the groove, with a complementary contact piece in slight elastic return against which comes press the contact piece, for example in the form of a rod on the base 45.

As indicated, the invention also relates to an adaptation piece 64 shaped on one side to come to be mounted on a conventional socket 100 with screw or bayonet and on the other side to receive the bulb 44 equipped with the electrical contacts of the contact parts described above.

In all these variants the strength and the quality of the electrical contacting are determined by the magnetic attraction. The magnetic force is sufficient for the socket to catch the base of the bulb after insertion. Only the characteristics of the magnet determine the force of attraction towards the electrical contact. The improvement of the magnetic retention is provided mainly by the mechanical assistance coming from the shape of the contacts.

The invention has been described above in detail; it is understood that various derived variants and modifications without inventive contribution fall perfectly within its scope. In particular we can consider to invert the metal plate and the magnet to place them respectively in the socket and on the base.

Two magnets can also be adopted, one in the socket 63 or the adapter piece 65 and the other on the base 45.

According to the same variant type without apparent socket contacts, it is also possible to provide the embodiment shown in the figures from 22 to 24.

According to this variant, the base 45 of the bulb also has cut faces or centering and guiding flats 46 and 47, allowing not only the orientation and the guiding as soon as it enters the socket but also the transmission of the movement of rotation when screwing the bulb into the conventional socket.

The present bulb has contacts 101 and 102 shaped in lamellae such as 103 as well as in the central part of the base, a magnetic attraction piece 104 of smaller surface embedded in the mass of the base.

This bulb with contact with lamellae fits either on a new so-called integrated socket 105 (FIG. 24) or on an attached base piece 106 (FIG. 23).

The base piece 106 has a body 107 of generally external shape identical to the base of conventional screw bulbs, that is to say with central stud 108 and with lateral screw surface 109.

It will be the same with regard to the general conformation for bayonet bulbs.

The base piece 106 has an inlet housing 110 of complementary hollow shape to that of the base 45, that is to say with a cylindrical lateral surface 111 with two flats 112 and 113.

The inlet housing 110 has a flat bottom 114 comprising in the central zone, for example embedded in the mass, a piece 115 of magnetic attraction.

This base piece, like the previous ones, has recessed contacts 116 and 117 under slots or openings 118 and 119 arranged in the extension of the flats 46 and 47, that is to say in correspondence with the lamellae 103. These recessed contacts may take various technical forms, for example pliers.

The new so-called integrated socket 105 shown in FIG. 24 allows the bulb to be admitted directly. It is of the same type as that described above.

It has a body 120 of generally cylindrical shape with a curved end 121 from which an electrical cord 122 emerges.

As for the base piece 106, the body has an inlet housing 123 with opposite flats 124 and 125 and an integrated bottom 126 having an attraction piece 127 and below the flats, recessed electrical contacts 128 and 129 .

In the case of an insulating attraction piece, this can occupy the entire bottom of the socket.

Numerous variants have been described above, it is understood that the scope of protection extends beyond particular technical forms, up to general functions.

Claims (10)

1. Bulb-socket assembly with rapid attachment between the lighting bulb and its electrical contact support, socket, base or the like, characterized in that the bonding force between the base (4), (45) of the bulb (1), (44) and its base or socket (2), (45) or support of electrical contacts is a magnetic attraction force between a magnetized part, magnet or other and a magnetic attraction part facing which keeps the faces of the base and of the base, socket or other, joined together, said base and the facing socket or support comprising interlocking structures ensuring the orientation of the contacts and the mechanical transmission of the rotational movement and the correspondence between the contacts electric. 2. Assembly according to claim 1, characterized in that the bulb has a base (45) of generally cylindrical shape with one or two cut or flat sections (46) and (47) opposite and parallel providing orientation and guidance , the front face of the base being coated with a metal plate (42) or a magnet having two notches at the level of the extension of the flats (46) and (47) revealing zones of electrical contact, said base and its flats from being housed in a socket or in an adaptation piece having a receiving volume of complementary conformation comprising at its bottom the magnet and on either side of it or of its central part, or through it ci, additional contact parts. 3. An assembly according to claim 2, characterized in that the electrical bulb contact parts are planar contacts perpendicular to the front face of the base. 4. The assembly of claim 3, characterized in that the bulb contacts are of the type with lamellae arranged parallel or in extension of the flats (46) and (47). 5. Assembly according to the preceding claims, characterized in that the electrical contact parts of the socket or of the adaptation part are set back relative to the bottom of the housing receiving the base. 6. Assembly according to the preceding claims, characterized in that the electrical contact parts of the socket or of the adapter part are pinched. 7. An assembly according to claims 3 and 4, characterized in that the ends of the bulb contact pieces are shaped as beads fitting into the contact pieces of the socket or of its adaptation piece. 8. An assembly according to claim 1, characterized in that the rear face of the base (4) of the bulb (1) is held by magnetic attraction in abutment contact by its studs (11) and (12) against the electrical contacts (7) and (8) of the base or the socket. 9. The assembly of claim 1, characterized in that the receptacle (3) receiving the base of the bulb is extended by a body (17) of generally cylindrical shape whose side surface is shaped into a screw to adapt to a conventional screw socket, in that the electrical contact parts of the screw socket are connected to the electrical contacts (7) and (8) of the receptacle through the body (17) and in that the circular contact piece of the screw socket, on the inlet neck (23), carries an annular contact piece (25) connected to the contact (8). 10. An assembly according to claims 1 to 9, characterized in that the centering structures are lugs (5) and (6) transverse to the base of the lamp and in that the guide means are opposite longitudinal grooves (14) and (15) formed in the side wall of the receptacle (3).

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