CA1067475A

CA1067475A - Lamppost

Info

Publication number: CA1067475A
Application number: CA262,689A
Authority: CA
Inventors: Jean-Claude Decaux
Original assignee: Jc Decaux Paris; PUBLICITE ABRIBUS
Current assignee: Jc Decaux Paris; PUBLICITE ABRIBUS
Priority date: 1975-11-21
Filing date: 1976-10-05
Publication date: 1979-12-04
Also published as: FR2332490B1; FR2332490A1

Abstract

PRECIS DE LA DIVULGATION:
Réverbère constitué par un mât supportant à son sommet une ampoule et un diffuseur à l'intérieur duquel l'ampoule est logée, le' support de l'ampoule étant indépendant de celui du diffuseur de manière qu'un déplacement relatif du diffuseur et de l'ampoule libère l'accès à cette dernière. L'ampoule est fixée au sommet d'un tube, monte coaxialement dans la partie supérieure du mât et se prolongeant au-delà de celui-ci. Le support du diffuseur, reposant par ailleurs sur le mât, est solidaire de l'extrémité supérieure d'un tube monté coaxialement autour du tube porte-ampoule, susceptible de coulisser vers le haut et présentant une ouverture latérale de dimensions telles que, lorsqu'elle arrive en regard de l'ampoule par soulèvement du diffuseur et de son support, l'ampoule puisse être saisie et remplacée. PRECISION OF DISCLOSURE:
Street lamp constituted by a mast supporting at its top a bulb and a diffuser inside which the bulb is housed, the 'bulb holder being independent of that of the diffuser so that a relative displacement of the diffuser and the bulb frees access to it. The bulb is fixed to the top of a tube, coaxially mounted in the part upper part of the mast and extending beyond it. The diffuser support, also resting on the mast, is secured to the upper end of a tube mounted coaxially around the bulb holder tube, which can slide towards the high and having a lateral opening of dimensions such that when it comes up against the bulb by lifting of the diffuser and its support, the bulb can be grasped and replaced.

Description

La presente invention est relative à un réverbere.
Les réverbères peuvent être constitués par un mât portant à son extremite superieure une ampoule placee à l'inte-rieur d'un dispositif diffusant la lumiere et convenablement fixe sur le Sommet dU mât.
Suivant une caracteristique de la presente invention, le dispositif diffusant la lumiere - appele ci-apres diffuseur -est forme d'un globe translucide eventuellement protege par un globe transparent.
Ces globes sont lourds et encombrants, si bien qu'il est peu pratique de changer l'ampoule, d'autant plus que l'elec-tricien doit operer à plusieurs mètres de hauteur.
L'invention a pour objet des moyens permettant de pallier cet inconvenient.
A cet effet, le present reverbere, du type de ceux constitues par un mât supportant a son sommet une ampoule et un diffuseur à l'interieur duquel ladite ampoule est logee, est essentiellement caracterise en ce que le support de l'ampoule est independant du support du diffuseur, de maniere qu'un deplacement relatif du diffuseur et de l'ampoule libère l'accès à cette dernière. Le reverbère est aussi caracterise en ce que ladite ampoule est fixee au sommet d'un tube, monté
coaxialement dans la partie superieure du mat et se prolongeant au-delà de celui-ci et le support du diffuseur, reposant par ailleurs sur le mât, est solidaire de l'extremite superieure d'un tube mont~ coaxialement autour dudit tube porte-ampoule, susceptible de coulisser vers le haut et presentant une ouverture latérale de dimensions telles que, lorsqu'elle arrive en regard de l'ampoule par soulèvement du diffuseur et de son support, ladite ampoule puisse être saisie et remplacee.
Il peut être avantageur que le diffuseur soit suscepti-ble d'être deplace vers le haut, l'ampoule restant alors fixe.

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On décrit en detail ci-après, a titre indicatif et nullement limitatif, un mode de réalisation préféré du rcverbere raisan~ l'objet de la préserlte invention, en référence au dessin annexé sur lequel:
La figure 1 est une vue en coupe verticale dudit reverbère avec sa lampe en place dans le diffuseur constitue par deux glo~es qui ne soht que partiellement dessines. _.

1~67475 -. La figure 2 est une vue simllaire ~ celle de la figure 1, mals montrant le diffuseur et son support en posit~on haute, permettant le libre accès à l'ampoule.
. Les figures 3let 4 sont des ~ues en coupe analogues ; S ~ celle de la figure 1 repr~sentant des variantes de réalisation dudit reverb~re.
Le r~verb~re repr~sente sur les figures 1 et 2 est - essentlellement constitu~ par Un mat 1 supportant une ampoule The present invention relates to a lamppost.
Street lights can be made up of a mast carrying a bulb placed at its upper end laughter of a device diffusing the light and suitably fixed on the top of the mast.
According to a characteristic of the present invention, the device diffusing the light - hereinafter called the diffuser -is formed by a translucent globe possibly protected by a transparent globe.
These globes are heavy and bulky, so it it is impractical to change the bulb, especially since the tricien must operate at several meters in height.
The subject of the invention is means making it possible to to remedy this drawback.
To this end, the present reverbere, of the type of those constituted by a mast supporting at its top a bulb and a diffuser inside which said bulb is housed, is essentially characterized in that the bulb holder is independent of the diffuser support, so that relative displacement of the diffuser and the bulb releases access to the latter. The reverbère is also characterized in that said bulb is attached to the top of a tube, mounted coaxially in the upper part of the mast and extending beyond it and the diffuser support, resting by elsewhere on the mast, is integral with the upper end a tube mounted ~ coaxially around said bulb holder tube, capable of sliding upwards and having an opening lateral dimensions such that when it comes next of the bulb by lifting the diffuser and its support, said bulb can be grasped and replaced.
It may be advantageous if the diffuser is susceptible ble to be moved upwards, the bulb then remaining fixed.

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We describe in detail below, for information and in no way limiting, a preferred embodiment of the rcverbere raisan ~ the subject of the pre-invention, with reference in the attached drawing in which:
Figure 1 is a vertical sectional view of said lamp with its lamp in place in the diffuser constitutes by two glo ~ es which are only partially drawn. _.

1 ~ 67475 -. Figure 2 is a similar view ~ that of Figure 1, evils showing the diffuser and its support in posit ~ on high, allowing free access to the bulb.
. Figures 3let 4 are ~ sectional similar ues ; S ~ that of Figure 1 repr ~ feeling alternative embodiments said reverb ~ re.
The verb ~ re shown in Figures 1 and 2 is - Essentlellement constituted ~ by A mat 1 supporting a bulb

2 et un diffuseur 3.
Le mat 1 comporte un montant tubulaire creux 4 fixe au sol et ~ la partie supérieure duquel - ~ui, seule figure sur le dessin - est convenablement fixé un embout 5.
Sur cet embout 5, peUvent être empilées plusieurs bagues similaires 6 suivant la hauteur voulue du mât 1. Lesdi~es bagues 6 sont assemblees et consolidées sur le montant tubu-lalre 4 par l'intermediaire de tirants 7 qui sont en prise la ois avec l'embout S et avec une couronne 8 reposant sur la bague terminale 6. Les extremit~ ~nférieures flletees des tlrants 7 soht ~ cet effet en prise avec des taraudages prati-ques dans l'embout 5, et leurs extremités supérieures fileteeselles aussi, traversent des alesages prevus dans la couronne 8, et coopèrent avec des écrous9qui, serrés sur ladite couronne 8 assurent la consolidation de l'ensemble.
Le support de l'ampoule 2 est constitué par un tube 10, loge ~ l'int~rieur de l'ensemble formé par les bagues ~
et 8e prolongeant au-dessus de la couronne 8. Ce tube porte-ampoule 10 est muni à sa base, d'un embout filet~ 11, suscep-tlble d'être v ssé sur l'embout 5 qui présente, dans ce but, un orifice central taraudé. Ledlt tube 10 presente, à son 80mmet une collerette 12, ~ la perlphérie de laquelle e t artlcule un dlsque 13, destiné à recevoir, en son centre, la douille 14 de l'ampoule 2.
Aln8i, le disque 13 est susceptible de venir s'appliquer et se fixer en position de fonctionnement sur la collerette 12.
Le diffuseur 3 se compose d'un globe interne translu-cide 3a et d'un globe externe transparent 3b, ce dernier ~tant avantageusement constitue par deux demi-globes.
En position normale, le mat 1 supporte le diffuseur 3 de la façon suivante :

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Une embase 15a vient s'emboiter sur la bague terminale 6. Cette embase lSa - dite embase inf~rieure -, cylindrique sa partie inferieure 15c destin~e à cooperer avec ladite -bagu~ terminale 6, est evasee ~ sa partie supérieure, où elle forme un rebord lSd, sur leguel repose un flasque 16a, appel~
flasgue inférieur. Ce flasque 16a coopère avec le rebord lSd au moyen de pions de centrage 17 introduits dans des logements pr~vus dans ledit rebord 15d et dans ledit flasque 16a.
De plus, ladite embase inférieure 15a est munie, dans le prolongement de sa partie cylindrique 15c, d'une jupe clrculaire interne lSe, en prise ~ son sommet avec l'extrémit~
supérieure d'un tube 18, se prolongeant vers le bas jusqu'au voisinage de l'embout 5 et mont~ coaxialement autour du tube porte-ampoule 10. Le tube 18, dont le diametre est superieur lS ~ celui de l'ampoule 2, présente en outre une ouverture lat~-rale 18a,-de dimensions ~galement supérieures ~ celles de l'ampoule 2.
Le globe 3b est percé ~ sa partie inf~rieure d'une ouverture circulaire dont le bord est pincé entre ledit flasque ;2Q inférieur 16a et un flasque 16b, dlt flasque sup~rieur, ces deux flasques 16a et 16b étant à cet effet serrés l'un contre l'autre par l'intermédiaire de vis 19.
Sur le flasque 16k, est appliqu~ et fixe au moyen de vls 20, le rebord 15d d'une embase 15b, pouvant être identique ~ l'embase 15a et appelee embase supérieure. La jupe circulaire lSe de cette embase supérieure lSb est en prise avec une bague double de guidage 21 entourant le tube porte-ampoule 10.
La portlon cylindrique lSc de ladlte ~lbase ~uperieure 15b est solidalre d'une rondelle de fixatlon 22 du globe 3a, rondelle qul cocpère avec des moyens complementalres de flxation dudit globe 3a, non représentés sur le dessin.
Ainsi, le diffuseur 3, et son support constitué par l'ensemble des embases inférieure 15a et supérieure lSb et des flasques lnférieur 16a et sup~rieur 16b, dont le tube 18 est solldaire, pourront etre soulev~s à une hauteur telle que, le ~; tube 18, coulissant vers le haut, autour du tube porte-ampoule 10, en étant guidé par la bague 21, son ouverture 18a arrive au n~veau de 1'ampoule 2, qui peut alors etre saisie par , ' .~.,. . ,,~, . .

l'~lectricien et remplacée tvoir figure 2).
Pour changer l'ampoule 2, il suffit par conséquent, que 1'~lectricien ait un étrier ou une fourche télescopique ou tout autre moyen appropri~, lui permettant, du sol, de saisir le support du diffuseur 3 par la partie évasée de l'embase in-ferieure 15a, de soulever le diffuseur 3 et son support ~
la hauteur voulue, de verrouiller la tige él~vatrice de l'~trier ou de la fourche telescopique, puis de grimper sur son échelle pour changer 1'ampoule.
Suivant la variante de réalisation du r~verbère, montr~e ~ la figure 3, les bagues 6 sont taraudées ~ leurs extremites inf~rieures et - sauf la bague terminale - filetees lëurs extr~mites superieures, de façon à pouvoir se visser les unes sur les autres. Cette disposition évitant l'emploi de tirants d'assemblage 7, le gain de place obtenu permet de prevoir un tube coulissant 18 de plus grand diamètre, et par conséquent, de pouvoir utiliser des ampoules de plus grandes dlmensions. Dans ce cas, ledit tube coulissant 18 présente, au volsinage de son sommet et au niveau de la jupe 15e de l'embase inf~rieure 15a, un bossage annulaire 18b en prise avec un retour 15f dirige vers l'int~rieur, qui termine ladite jupe 15e, à sa partie supérieure.
La ~upe 15e de l'embase superieure 15b présente ` un taraudage destiné à coopérer avec un filetage pr~vu au sommet du tube 18.
On voit également sur la figure 3 que ledit tube coullssant 18 presente à sa base un retour d'équerre 18c suscep-tlble de venir buter contre une collerette 1Oa fixée ~ un endroit appropri~ de la paroi externe du tube porte-ampoule 10 pour limiter la course du dépla~ement du tube coulissant 18 et ~vlter que ce dernier ne se déboIte du tube porte-ampoule 10.
En outre, comme le montre aussi la figure 3, il est posslble de remplacer avantageusement la collerette 12 et le dlsque 13 cuivant les flgures 1 et 2, par une rotule 23, articu-l~e sur le sommet du tube porte-ampoule 10, recevant la douille 14 dans sa partie centrale et bloqu~e ~ l'aide de vis 24 qui malntiennent l'ampoule en position verticale. Un tel montage evite de prévoir une longueur de fil n~cessaire pour le basculement ` ~06747S

lateral de l'ampoule 2 - comme cela etait le cas pour la varian-te de realisation decrite precedemment - puisque dans ce cas, le basculement de ladite ampoule est frontal.
- La figure 4 montre la forme d'ex~cution pr~feree du r~verb~re suivant l'invention.
D'apres cette variante particulièr nent intéressante, le m~t 1 du reverbère est constitue, comme pour les cas pr~ce-dents, par un montant tubulaire creux 4 et par plusieurs bagues 6 emboitees les unes sur les autres. Le montant 4 porte inte-rieurement, ~ son so~unet, un etrier 25 sur lequel est fixe le tu-be porte-ampoule 10.
Le mode ae fixation du diffuseur 3 consiste, pour le globe externe 3b en deux embases 15a, 15b et en deux flasques 16a, 16b du meme t~pe que précedel[ment, et pour le globe inter-ne 3a, en un support 26 conforme en coupelle s'appuyant sur 1'embase supérieure 15b.
~e tube coulissant 18 presentant une ouverture latexale 18a pour le changement de 1'ampoule comporte, comme dans la 8econde variante de realisation du reverbère selon l'inventic-n, au vsisinage de son sommet, un bossage annulaire 18b coopérant avec l'embase inferieure 15a, et à sa base, deux équerres 18c.
Ce tube 18 est rendu solidaire des embases inférieure lSa et superieure 15b par deux tirants internes 28 dont les sommets forment des crochets de serrage 28a coopérant avec des cavalier~ 29 en prise avec le support 26 du globe interne 3a, - `au moyen des ecrous 26a. Les tirants 28 sont termines à leurs extremites inférieures par des tiges filet~es 28b fixées aux ~querres 18c ~ ar de~ ~crous 28c.
Une patte de centrage 30, entourant le tube porte-ampoule 10 et fix~e au tube coulissant 18, guide ce dernier lors de son soulèvement pour le changement de l'ampoule 2. Cette patte 30 est fixée à un endroit approprie dudit tube 18 de façon ~
limlter la course de ce dernier ju~qu'à ce que ladite patte 30 vlenne buter contre le tube 10 lui-même ~ui presente un diamètre plus large au voisinage de la douille 14~
Sur la figure 4, l'articulation de la douille 14 sur le tube porte-ampoule 10, articulation analogue à la rotule 23 selon la seconde variante, est référencée 31.
La forme d'exécution représentee à la figure 4 offre en particulier l'avantage d'une plus grande facilité de montage.

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.. , Dans la pratique, le globe interne 3a sera avantageuse-ment en polyéthylène, le globe externe 3b en un mat~riau du type PLEXIGLAS et les bagues 6 en aluminium.
. Il est du reste bien entendu que le de de réalisation .5 de la présente invention qui a éte decrit ci-dessus, en réfe-rence au dessin annexe, a et~ do.nne a titre purement indicatif et nullement limitatif et que des modifications du domaine des ~quivalents peuvent atre apportées sans qu'on s'écarte pour cela du cadre de la pr~sente invention ; c'est ainsi notamment que le diffuseur pourrait être fixe, l'ampoule étant alors 8usceptible d'être déplac~e vers le bas relativement ~ ce dernier.
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. 2 and a diffuser 3.
The mast 1 has a hollow tubular upright 4 fixed to the ground and ~ the upper part of which - ~ ui, only figure on the drawing - is properly attached a tip 5.
On this end piece 5, can be stacked several similar rings 6 depending on the desired height of the mast 1. Lesdi ~ es rings 6 are assembled and consolidated on the tubular upright lalre 4 by means of tie rods 7 which are in engagement the screw with the S tip and with a crown 8 resting on the terminal ring 6. The extremit ~ ~ nférieures flletees des tlrants 7 soht ~ this effect when engaged with practical threads that in the nozzle 5, and their upper threaded ends also, pass through bores provided in the crown 8, and cooperate with nuts 9 which, tightened on said crown 8 ensure the consolidation of the whole.
The bulb holder 2 consists of a tube 10, lodges the interior of the assembly formed by the rings and 8e extending above the crown 8. This tube bulb 10 is provided at its base with a thread tip ~ 11, suscep-tlble to be v ssé on the tip 5 which has, for this purpose, a tapped central hole. Ledlt tube 10 presents, at its 80mm and a collar 12, ~ the periphery of which and artlcule a dlsque 13, intended to receive, in its center, the socket 14 bulb 2.
Aln8i, disc 13 is likely to come to apply and fix in the operating position on the flange 12.
The diffuser 3 consists of an internal translucent globe cide 3a and a transparent outer globe 3b, the latter ~ as advantageously constituted by two half globes.
In normal position, the mast 1 supports the diffuser 3 as follows :

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A base 15a fits onto the end ring 6. This lSa base - called lower base - cylindrical its lower part 15c intended to cooperate with said -bagu ~ terminal 6, is flared ~ its upper part, where it forms a rim lSd, on leguel rests a flange 16a, called ~
lower flasgue. This flange 16a cooperates with the flange lSd by means of centering pins 17 introduced into housings pr ~ seen in said flange 15d and in said flange 16a.
In addition, said lower base 15a is provided, in the extension of its cylindrical part 15c, of a skirt internal clrulaire lSe, in engagement ~ its summit with the extremity ~
top of a tube 18, extending downward to neighborhood of the nozzle 5 and mounted ~ coaxially around the tube bulb holder 10. The tube 18, the diameter of which is greater lS ~ that of the bulb 2, further has a lat opening ~ -rale 18a, -dimensions ~ also greater ~ those of bulb 2.
The globe 3b is pierced ~ its lower part ~ lower of a circular opening whose edge is pinched between said flange ; 2Q lower 16a and a flange 16b, dlt upper flange ~ these two flanges 16a and 16b being tightened for this purpose one against the other the other by means of screws 19.
On the 16k flange, is applied ~ and fixed by means of vls 20, the edge 15d of a base 15b, which may be identical ~ the base 15a and called the upper base. The circular skirt lSe of this upper base lSb is engaged with a double guide ring 21 surrounding the bulb holder tube 10.
The cylindrical portlon lSc of ladlte ~ lbase ~ uperieure 15b is integral with a fixing washer 22 of the globe 3a, washer which co-operates with additional means of securing said globe 3a, not shown in the drawing.
Thus, the diffuser 3, and its support constituted by all the lower 15a and upper lSb bases and flanges lnférieur 16a and sup ~ rieur 16b, the tube 18 of which is can be lifted ~ s to a height such that the ~; tube 18, sliding upwards, around the bulb holder tube 10, being guided by the ring 21, its opening 18a arrives at the level of bulb 2, which can then be grasped by , '' . ~.,. . ,, ~,. .

the electrician and replaced see Figure 2).
To change the bulb 2, it suffices therefore, that the electrician has a stirrup or a telescopic fork or any other appropriate means, allowing him, from the ground, to seize the diffuser 3 support by the flared part of the base ferieure 15a, to lift the diffuser 3 and its support ~
the desired height, to lock the rod el ~ vatrice of the ~ sorter or telescopic fork, then climb on its ladder to change the bulb.
According to the variant embodiment of the verb, show ~ e ~ Figure 3, the rings 6 are tapped ~ their lower ends and - except the end ring - threaded lëurs extr ~ mites superieure, so that they can be screwed on top of each other. This provision avoiding employment of tie rods 7, the space saving obtained allows provide a sliding tube 18 of larger diameter, and by therefore, being able to use larger bulbs dlmensions. In this case, said sliding tube 18 has, in the flight of its summit and at the level of the 15th skirt of the lower base 15a, an annular boss 18b engaged with a return 15f directs inward, which ends said skirt 15th, at its upper part.
The ~ upe 15th of the upper base 15b has `a thread intended to cooperate with a thread pr ~ seen at top of tube 18.
It can also be seen in FIG. 3 that said tube coullssant 18 presents at its base a return angle 18c suscep-tlble to come up against a 1Oa flange fixed ~ a appropriate place ~ on the outer wall of the bulb holder tube 10 to limit the travel of the displacement of the sliding tube 18 and ~ vlter that the latter is not dislodged from the bulb holder tube 10.
Furthermore, as also shown in Figure 3, it is possible to advantageously replace the flange 12 and the dlsque 13 cuiving the figures 1 and 2, by a ball joint 23, articulated l ~ e on the top of the bulb holder tube 10, receiving the socket 14 in its central part and blocked ~ e ~ using screws 24 which hold the bulb upright. Such mounting avoids provide a length of wire n ~ necessary for tilting `~ 06747S

side of bulb 2 - as was the case for the varian-realization previously described - since in this case, the tilting of said bulb is frontal.
- Figure 4 shows the preferred form of execution of the r ~ verb ~ re according to the invention.
According to this particularly interesting variant, the m ~ t 1 of the reverbere is constituted, as for the cases pr ~ ce-teeth, by a hollow tubular upright 4 and by several rings 6 nested on top of each other. The upright 4 carries inte-laughing, ~ its so ~ unet, a stirrup 25 on which is fixed the tu-be bulb holder 10.
The fixing mode of the diffuser 3 consists, for the external globe 3b in two bases 15a, 15b and in two flanges 16a, 16b of the same type as above, and for the inter-globe ne 3a, in a conforming support 26 in a cup supported on The upper base 15b.
~ e sliding tube 18 having a latex opening 18a for changing the bulb comprises, as in the 8th second embodiment of the reverbère according to the inventic-n, at the plane of its summit, an annular boss 18b cooperating with the lower base 15a, and at its base, two brackets 18c.
This tube 18 is made integral with the lower bases lSa and superior 15b by two internal tie rods 28 whose vertices form clamping hooks 28a cooperating with jumper ~ 29 in engagement with the support 26 of the internal globe 3a, - `by means of the nuts 26a. The tie rods 28 are finished at their lower ends by thread rods ~ es 28b fixed to ~ querres 18c ~ ar de ~ ~ crous 28c.
A centering lug 30, surrounding the bulb holder tube 10 and fix ~ e to the sliding tube 18, guides the latter during its lifting for the change of the bulb 2. This leg 30 is fixed to an appropriate place of said tube 18 so ~
limit the stroke of the latter ju ~ that said leg 30 vlenne abut against the tube 10 itself ~ ui has a diameter wider in the vicinity of the socket 14 ~
In FIG. 4, the articulation of the socket 14 on the bulb holder tube 10, joint similar to the ball joint 23 according to the second variant, is referenced 31.
The embodiment shown in Figure 4 offers in in particular the advantage of greater ease of assembly.

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.., In practice, the internal globe 3a will be advantageous-ment in polyethylene, the outer globe 3b in a mat ~ riau PLEXIGLAS type and 6 aluminum rings.
. It is, of course, moreover that the realization .5 of the present invention which has been described above, with reference to Refer to the accompanying drawing, a and ~ do.nne for information only and in no way limitative and that modifications to the domain ~ equivalents can be brought without deviating for that of the framework of the present invention; this is how it is that the diffuser could be fixed, the bulb then being 8usceptible to be moved ~ e down relatively ~ the latter.
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Claims

The embodiments of the invention, about which an exclusive right of property or privilege is claimed, are defined as follows:

1. Street lamp of the type formed by a mast supporting at its top a bulb and a diffuser inside laugher of which said ampoule is housed, the bulb holder being independent of the diffuser support, so that a relative movement of the diffuser and the bulb frees access to the latter, characterized in that said bulb is fixed at the top of a tube, mounted coaxially in the part superior of the mast and extending beyond it and in this that the diffuser support, also resting on the mast, is integral with the upper end of a coaxially mounted tube-ment around said bulb holder tube, capable of sliding upwards and having a lateral opening of dimensions such as when it comes up against the bulb by lifting of the diffuser and its support, said bulb can be entered and replaced.

2. Street lamp according to claim 1, characterized in that the diffuser consists of an internal globe protected by an outer globe and in that said inner globe is supported by an upper base resting on an upper flange which pinches the edge of said outer globe between it and a flange lower, the latter cooperating with a lower base which rests on the top of the mast and which has means of fixing sliding tube.

3. Street lamp according to claim 2, characterized in that each base is constituted by a cylindrical portion that flares so as to form a rim and which, moreover, is extended by an internal circular skirt, the two edges cooperating with the lower and upper flanges, the skirt of the upper base being engaged with a guide ring surrounding the bulb holder tube and the skirt of the lower base co-operating with the top of the sliding tube.

4. Street lamp according to claim 2, characterized in that each base is constituted by a cylindrical portion drique which flares so as to form a ledge and which, moreover, is extended by an internal circular skirt, the two edges cooperating with the lower and upper flanges, the skirt of the upper base screwing onto the top of the sliding tube and the skirt of the lower base resting on a boss ring provided on this tube.

5. Street lamp according to claim 2, characterized in that each base is constituted by a cylindrical portion that flares so as to form a rim and that, moreover, is extended by an internal circular skirt, the two edges cooperating with the lower and upper flanges, the skirt of the lower base resting on an annular boss provided on this tube and tie rods cooperating on the one hand with the support of the inner globe and on the other hand, with the lower end sliding tube.

6. Street lamp according to claim 1, characterized in that said sliding tube has a return at its base square inward, likely to come up against a flange fixed to a suitable place on the external wall of the bulb holder tube to limit the travel movement of the sliding tube and prevent it from falling out of the tube bulb holder.

7. Street lamp according to claim 1, characterized in that a centering lug surrounding the bulb holder tube and attached to the sliding tube. guides the latter when lifting for changing the bulb, this tab being fixed at an appropriate location on said tube so as to limit the stroke of the latter until said leg comes to abut against the tube itself which has a larger diameter when bushing.

8. Street lamp according to claims 1, 2 or 6, characterized in that the mast consists of a tubular upright hollow, provided at its top with a nozzle or a stirrup in which is fixed the bulb holder tube, and by rings capable of being stacked on said end piece and of being assembled on said hollow tubular upright.

9. Street lamp according to claim 6, characterized in that said rings are clamped on the tubular upright hollow by means of cooperating assembly tie rods, by their upper ends, with a crown integral with the end ring and by their lower ends, with the em-end secured to the upright.

10. Street lamp according to claim 6, characterized in that said rings are screwed on one another.

11. Street lamp according to claims 1, 2 or 6, characterized in that the bulb and its socket are susceptible ble to tip when changing said bulb.

12. Street lamp according to claims 1, 2 or 6, characterized in that the diffuser is capable of being moved upwards, the bulb remaining fixed.