DE29906750U1 - Bracket for a lamp - Google Patents

Description

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Dipl.-lng. Harald Ostriga*
Dipl.-lng. Bernd Sonnet*

Dipl.-lng. JOChen-Peter WirthS Home address:

^&Ggr;&sgr; Stresemannstr. 6-8

* Authorized by the European Patent Office 42275 Wuppertal-Barmen

Ostriga. Sonnet & Wirths ■ PO Box 20 16 53 · D-42216 Wuppertal

S/g

Applicant: Brökelmann, Jaeger

& Busse GmbH & Co
Werler Str. 1

59755 Arnsberg

Designation

of the invention: holder for a lamp

The invention relates to a holder for a lamp, in particular for a halogen lamp with a GU10 and GU10Z base, comprising a lamp socket and a socket holder made of insulating material, wherein the socket holder is designed as a cover that can be snapped onto the lamp socket from the rear side of the latter and there are locking means on the inside of the cover and on the outside of the socket, of which the cover is arranged and/or designed to be resiliently deflectable, and anti-twisting means that act in a form-fitting manner.

In principle, a lamp socket is sufficient to hold a lamp. However, for many applications, special socket holders in the form of a hood - also called a "dome" - are used, which are mounted in the luminaire and hold the lamp socket using snap-in connectors.

In the case of the lamps referred to with GU10 or GU10Z bases, for which the lamp holder according to the invention

Postbank Credit and Volksbank eG Commerzbank AG VAT ID No. Eat Wuppertal-Barmen Wuppertal-Barmen VAT No. (Bank code 360 100 43) 445 04-431 (Bank code 330 600 98) 301 891 024 (BtZ 330 400 01) 4 034 823 DE 121068676

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primarily, although not exclusively, intended for use as sockets for high-voltage halogen lamps and the sockets are made of ceramic material such as steatite or a high-temperature-resistant plastic such as PPS (polyphenyl sulphite) or LCP (liquid crystal polymer).

Such a socket is, for example, the subject of DE 197 14 874 C1 of the applicant. It is a lamp socket in whose contacts the lamp contact pins, which are aligned parallel to one another, are locked essentially in a bayonet-like manner. The socket consists of a socket body and a base that closes it, which are riveted together via two aligned holes.

For sockets of this type, there are hood-shaped socket holders made of thermoplastic material such as PBT (polybutylene terephthalate). The casings of the socket holders are provided with two opposing, axially extending ribs that fit into the correspondingly adapted grooves on the casing of the socket body (see, for example, the grooves in Fig. 2 of DE 197 14 874 C1 at around 11 and 16 o'clock) and can provide an anti-twisting device between the socket and the hood. The anti-twisting device is important in that when the lamp is inserted into the socket, it tends to twist. Since this occurs against the hood fixed in the lamp, it could happen that the parts twist against each other without an anti-twisting device. This causes the connecting wires to move in an unacceptable manner and could even break off.

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However, this type of anti-twisting device is not very reliable in practice. It should be noted that the hood and socket are locked together by axially inserting them into one another. Since the socket is made of a rigid material, the elasticity temporarily required for locking must be obtained from the hood material.

Since the anti-twisting means mentioned are only of a small height and therefore only engage with each other to a small extent, and on the other hand the hood is held elastically, mutual twisting cannot be prevented under the influence of higher forces. Higher forces occur in the case of sockets, in particular in the preferred application of the invention, because the insertion movement of the lamp takes place in the manner of a bayonet lock, i.e. over a short rotational path with a sudden reaching of the end position, which the hurried user may notice too late to stop the screwing movement early enough.

The effectiveness of the anti-twisting device between the hood and the socket could be increased if the ribs on the inside of the hood were made higher or sharp-edged. However, this would require the casing grooves in the socket to be adapted accordingly. This in turn would require a new design of the socket, which is manufactured as standard by many manufacturers. There is also the difficulty that the ceramic body is already weakened by the shallow casing grooves and must not be weakened any further.

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The problems identified have prompted many frame manufacturers to offer hoods in which the frame is secured by two axial screws, which, however, means additional work.

Consequently, the present invention has the object

The aim of the invention is to provide a lamp holder of the type defined in more detail in the preamble of claim 1, which has a particularly secure anti-twisting protection between the lamp holder and the hood-like holder holder.

The invention solves this problem with the features of claim 1 and is accordingly characterized in that the anti-twisting means on the hood side comprise at least one pin that is decoupled from the elasticity of the hood and that engages in a pin receptacle of the socket when the hood and socket are connected to one another.

The essential core of the invention is therefore that the anti-twisting means are not arranged on the elastically expandable parts of the lamp holder. Due to this decoupling of the anti-twisting means from the expansion elasticity of the hood, it is achieved that forces in the sense of a twisting movement of a socket relative to the hood are safely absorbed and cannot lead to the hood spreading.

The resulting advantages of the invention are considerable. Firstly, it is not necessary to make changes to the version itself. Even the changes already made there

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The existing casing grooves could be used as effective components of the anti-twisting device, provided that the pin on the hood side is sufficiently rigid.

A further advantage of the invention is that the hood can easily be provided with recesses in the casing, which on the one hand have the advantage of increasing the elasticity required for snapping the hood and socket together. On the other hand, the recesses in the casing can now be made so large that they can serve as conductor feedthroughs. With the state of the art referred to so far, this is fundamentally impossible.

A preferred development of the invention provides that two pins are provided diametrically opposite one another on the inside of the hood, which are formed on the inside of the hood base and extend parallel to the longitudinal central axis (rotation axis) of the hood, and that the hollow rivets present there serve as the pin holder for the socket, which hold the socket body together with a locking plate and through which screw-on assembly is possible. With the help of these features, the invention makes use of the previously completely undiscovered fact that the standard sockets already have the previously untapped means that can be used for the plug connection with the pins. This is seen as a particular success of the present invention. A torsional stability of the lamp holder is achieved, which was previously only possible by using screws.

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Further design options and advantageous developments of the invention are specified in the cited subclaims and are also apparent from the following explanation of a preferred embodiment shown in the drawings. In the drawings:

Fig. 1 shows a lamp holder according to the invention in a diagrammatic representation with an oblique view of the lamp insertion side,

Fig. 2 a side view of the lamp holder,

Fig. 3 is a view corresponding to Fig. 1, but with parts of the lamp holder shown separately,

Fig. 4 is a side view corresponding to Fig. 2, but only of the socket holder,

Fig. 5 a top view of the lamp holder looking towards the lamp side and

Fig. 6 is a longitudinal section through the lamp holder along the line VI-VI in Fig. 5.
25

The lamp holder, designated as a whole with 10, comprises a lamp socket 11 and a socket holder 12.

The socket 11 is made of high temperature resistant material such as ceramic or a suitable plastic material. In the illustrated embodiment

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This is a socket for lamps with GU10 or GZ10 bases, i.e. for high-voltage halogen lamps. Such lamps have two contact pins aligned parallel to one another, which are brought together by a bayonet-like coupling process with the contacts contained in the socket 11, not shown in the drawings. Regarding the structure of such a socket, reference is made to DE 197 14 874 C1 as an example.

The socket holder 12 is made of an elastic, thermoplastic material such as PBT. It is intended to be firmly anchored to a lamp plate or in a reflector housing of a lamp and to support the lamp socket 11. The socket holder 12, which is usually also referred to as a "hood", "insulating hood" or "plastic cap", can be locked to the socket 11 in the course of a plug connection in the direction of the common longitudinal center axis L. For this purpose, the socket holder 12 has four circumferentially offset locking lugs 13 on the inside of its hood casing 12a, which are opposite locking recesses 14 on the casing of the socket 11. The locking mechanisms 13, 14 have the task of holding the parts 11 and 12 firmly together in the direction of the longitudinal axis L.

Independently of this and offset around the circumference, inner casing ribs 15 are provided on the socket holder 12 and casing grooves 16 on the socket body 11. In the state of the art, these serve as anti-twisting means, whereas here they essentially serve for circumferential orientation and axial guidance.

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Anti-twisting means such as 15, 16 cannot, due to their small radial extent and thus their small overlap, reliably prevent the socket 11 from being twisted relative to the socket carrier 12 held on the lamp when a lamp is inserted into the insertion openings 17 of the lamp socket 11, namely as a result of elastic expansion of the casing of the hood-shaped socket holder 12.

Therefore, according to the invention, the following is provided to prevent the holder parts 11 and 12 from twisting against each other:

On the inside of the rigid base 12b of the hood-shaped socket holder 12 there are two pins 18 extending parallel to the longitudinal center axis L, which are completely decoupled from the wall parts of the socket holder 12, i.e. from the elasticity of the hood 12. The pins 18 find their torsional abutment in axially directed openings 19 of the socket 11. These openings 19 are the hollow rivets with which the main body of the socket 11 is riveted to a closure cover 11a. The positive engagement of the pins 18 in the corresponding holes is shown in Fig. 6, although the hollow rivets are not shown there.

As can be seen from the description and the drawings, the anti-twisting protection caused by this positive engagement of the parts is completely independent of the elastic outward deformation of wall parts of the hood 12. For this reason, the hood 12 can have the very generous casing recesses 20 that can be seen in the figures.

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sen, which on the one hand ensure a high elasticity of the expandable wall parts created by them and on the other hand allow conductors to be led through them to the conductor connection points of the socket 11.

Claims (6)

Brökelmann, Jaeger & Busse Gmbf*»| «Cfc> ; ···· · *···"··· - 10 - Claims 1. Holder (10) for a lamp, in particular for a halogen lamp with a GU10 and GU10Z base, comprising a lamp socket (11) and a socket holder (12) made of insulating material, wherein the socket holder (12) is designed as a cover to be snapped onto the lamp socket (11) from the rear side thereof and on the inside of the cover (12) and on the outside of the socket (11) there are locking means (13, 14), of which those on the hood (12) are arranged and/or designed to be resiliently deflectable, and there are anti-twist means (15, 16) which act in a form-fitting manner, characterized in that the anti-twist means on the hood comprise at least one pin (18) which is decoupled from the elasticity of the hood (12) and which engages in a pin receptacle (19) of the socket (11) when the hood (12) and socket (11) are connected to one another. 2. Holder according to claim 1, characterized in that the pin (18) extends substantially in the axial direction. 3. Holder according to claim 1 or 2, characterized in that the pin (18) is formed on the inside of the hood base (12b) and extends parallel to the longitudinal center axis (L) (rotation axis) of the hood (12). 4. Holder according to one of claims 1 to 3, characterized in that two pins (18) are provided diametrically opposite one another on the inside of the hood and the hollow rivets serve as the pin receptacle (19) of the socket (11), Brökelmann, Jaeger & Busse Gmbfr··! »Cfo j ···· · *···"··! - 11 - which hold the socket body (11) together with a closure plate (11a). 5. Holder according to one of claims 1 to 4, characterized in that the hood (12) is connected to the Hood edge is provided with jacket recesses (20) extending over part of its height and that the pins (18) are assigned to the same peripheral areas of the hood (12) as the jacket recesses (20).
10 6. Holder according to claim 5, characterized in that two pins (18) and two casing recesses (20) are provided circumferentially offset by 180° to one another.