Lamp standard with an access opening to be shut off by a door

Abstract: Polygon lamp standard, extruded from aluminium and provided at a particular point with an access opening (27) to be shut off flush by a door (28), whereby the wall parts of the lamp standard adjoining the side edges of the access opening (27) and in line with said side edges are made thicker.

Description: The invention relates to a lamp standard, extruded from aluminium and provided with an access opening to be shut off flush by a door, whereby the longitudinal side edges of the access opening are provided with reinforcements. Such a lamp standard is known from NL-A-7908623. It contains a separate insert sleeve, which is situated at the location of an access opening in the standard. Said sleeve, which has a corresponding opening, is provided with reinforcement ribs which should prevent the formation of fatigue cracks in the sleeve. This known lamp standard has several disadvantages. Although the reinforcement ribs first of all provide additional strength to the sleeve, the additional support provided to the lamp standard itself is however limited to the friction fit between sleeve and standard. Furthermore, the manufacturing costs of the lamp post according to NL-A-7908623 are negatively influenced due to the necessary additional manufacturing step of expanding the reinforcement sleeve in the interior of the lamp standard. The aim of the invention is therefore to provide a lamp standard with better strength and stiffness characteristics, in particular near the access opening thereof, and which is easier to manufacture. This is achieved in that the reinforcements are carried out as ribs which are integrated in the longitudinal side edges of the access opening and which are extruded in one piece with the wall of the lamp standard. According to a preferred embodiment, the cross-section of the lamp standard is a polygon, in particular a dodecagon, while the access opening and the door extend over three corners of the dodecagon. Weakening at the access opening is avoided through the thickened wall parts adjacent to the access opening. It is pointed out that a polygonal lamp standard is known per se from European Patent Application 0,221,992. In this case the corners are, however, specially weakened so that they can break off if they are hit by a vehicle. There is no mention of a reinforcement at the position of an access opening. The invention will be explained in greater detail with reference to the drawing for an example of an embodiment, in which: Fig. 1 shows a cross-section of the extruded lamp standard section according to the invention; Fig. 2 shows a cross-section of the lamp standard according to Fig. 1 at the access opening and above the door; Fig. 3 shows a cross-section corresponding to Fig. 2 at the fastening of the door; and Fig. 4 shows a cross-section corresponding to Fig. 1 of another lamp standard section. The lamp standard shown is the shape of a regular dodecagon, of which the corners are indicated by 1 - 12 and the inward-curved sides by 13 to 24. The walls 18 and 19 are provided with inward-directed strips 18a and 19a respectively, which together form a rail for fitting connection equipment and fuse boxes (not shown). Since this rail 18a, 19a is integral with the standard itself, earthing problems are avoided and an additional reinforcement of the lamp standard is produced. Channels 4a and 10a are formed near the corners 4 and 10 respectively. These channels can be used for screwing bolts or screws (not shown) into the top end of the standard, in order to be able to fix a connection or an adaptor (not shown) on the top end for light fittings. The sides 14 and 15 and the sides 22 and 23 are made mirror-inverted and differ from the other sides. Only the sides 14 and 15 will be discussed. In particular the side 15 and the corner 3 are thickened inwards, indicated by 25. By means of a step 26 the thickened part 25 approximately halfway along the side 14 passes into the side 15. This also applies to the side 23 and the corner 11. At a certain limited distance above ground level a part of the standard is cut away for the formation of an access opening, indicated by a dashed line 27. Fig. 2 shows a section across this access opening 27. This access opening 27 can be shut off by a door 28 which takes up the place of the corners 12, 1 and 2, the sides 24 and 13 and about half of the sides 23 and 14 which have been cut away here. The door 28 is laterally confined against the steps 26 by the edges 28b. As can be seen from Fig. 2, the door is thickened inwards over the central part by a part 28a. The object of this emerges from Fig. 3, which shows a section across the access opening 27 and the door 28 at the fastening of the door 28 in the opening 27. This fastening takes place in a known manner by means of a bolt 29 and a bracket 30, the ends of which engage behind the steps 26. The bolt 29 extends through the thickened central part 28a of the door and can thereby be fitted countersunk. This also counteracts vandalism. The door 28 can also be cut out of a section obtained by extrusion. It will be clear that the lamp standard can also be of a different shape than a dodecagon, for example a square; this shape is shown in Fig. 4. The corners are indicated here by 31, 32, 33 and 34 and the sides curved outwards by 35, 36, 37 and 38. The thickened parts 25 take up about half the sides 35 and 38. The screw holes are indicated by 32a and 34a and the strips by 36a and 37a.

Claims: Lamp standard, extruded from aluminium and provided with an access opening (27) to be shut off flush by a door (28), whereby the longitudinal side edges of the access opening (27) are provided with reinforcements characterized in that the reinforcements are carried out as ribs (25) which are integrated in the longitudinal side edges of the access opening (27) and which are extruded in one piece with the wall of the lamp standard. Lamp standard according to Claim 1, characterized in that the cross-section of the lamp standard is a polygon. Lamp standard according to Claim 2, characterized in that the polygon is a dodecagon, and in that the access opening and the door extend over three corners of the dodecagon. Lamp standard according to Claim 1, 2 or 3, characterized in that a fixing rail for fitting connection equipment and fuse boxes is integrated in the interior. Lamp standard according to Claim 1, 2 or 3, characterized in that axial channels are formed in two diametrically opposite corners, into which channels bolts can be screwed for fixing a shut-off head or an adapter for lighting equipment on the top end of the lamp standard. Door intended for shutting off an access opening in a lamp standard according to one or more of the preceding claims, characterized in that the door over the central part, facing the interior of the lamp standard, is made thicker so that it can accommodate countersunk fixing bolts.

Inventors: GEHRELS DIRK, GEHRELS, DIRK
Applicants: ALCOA NEDERLAND BV, ALCOA NEDERLAND B.V.
Application year: 1990
Main classification: E04H12
IPC codes: E04H12