DK142550B - Tubular mast for lighting fixtures. - Google Patents

Description

di) petition 1 ^ + 2550 ((\ R§ / DENMARK (Bi) Int. Cl.3 E 04 H 12/08 UMmviMniX F 21 V 21/00 '(21) Application No 244θ / 7 ^ ί (22) Filed on 4th IH & j 1973 (24) Race day 4 May 1973 (44) Application submitted and petition published on 1 7 · HOV 1 9 80

DIRECTORATE OF

PATENT AND TRADE MARKET (30) Priority requested from 9 May 1972, 6074/72, SE (71) AB WIKSTRAND & BERG WIBE, Mora, SE.

(72) Inventor: Rolf Fors b er g, Monumentvaegen 7 A, Mora, SE.

(74) Plenipotentiary in the proceedings:

Patent agent company Magnus Jensens Eftf._ (54) Tubular saturated for lighting fixtures.

The present invention relates to a tubular mast for illumination ulcers. Masts to carry lighting fixtures are advantageously carried out as pipe masts. However, when placed near traffic arteries, the risk of masts being hit by motor vehicles is so great that it must be considered to replace pipe masts and grid masts, which are more resilient in collisions. and therefore do not cause such serious injury.

The object of the invention is to provide a mast for lighting fixtures which, while retaining substantially the good properties of the pipe mast, are more resilient to horizontal impact forces which attack something above the ground, so that the mast instead of providing a transverse stop of the oncoming motor vehicle under its own deformation provides a more extended reaction force over time, thereby reducing the magnitude of the maximum deceleration of the vehicle caused by the collision.

2 142550

This is achieved according to the invention in the embodiment of claim 1.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be explained in more detail in connection with the drawing, in which: FIG. 1 is a side view of a mast according to the invention; FIG. 2 shows, at a larger scale, the lower part of the mast; FIG. 3 is a section along line III-III of FIG. 2, and FIG. 4-7 show the lower part of other embodiments of the mast according to the invention.

The FIG. 1 is made up of three successively narrower cylindrical tubes 11, 13 and 15 and an outrigger arm 17 »which carries a lighting fixture not shown. The idea of the invention can, of course, be applied to other known pipe mast types, for example those with a cylindrical or tapered pipe and with or without boom.

The pipes used are usually of circular cross-section, but other, for example, multilangular cross-sectional shapes may be present.

The lower end of the lower mast section 11 is slit after four mutually identical tongues 19,21,23 and 25 having invariable width. These tongues are bent from the axis of the mast, for example by a tapered mandrel having been inserted at the end of the tube. At the same time, the tongues can be formed by flattening their circular arcuate section or imparting a larger radius of curvature. The free ends of the tongues are welded to the periphery of a circular footplate 27. This footplate has holes 29 for bolts, whereby the mast is screwed to a grounded ground 31 of suitable design.

The tongues together form one foot in one with the lower master tube 11. This foot is wider downwards and thus gives the slit about the same resistance to bending of the mast as in other cross sections, as regards usual side effects. The individual tongues, whose cross-section is insignificant compared to the length of the tongues, are, however, weak and slightly bent outwards if struck by a horizontal force between the ends. Upon impact of the mast, one of the tongues is first hit and then several more, so that the resistance increases as the deformation progresses according to the severity of the collision.

Due to the location of the probable point of attack in a collision, the tongues are given a length of 1-2 meters. Their inclination shall not exceed 10 ° and the diameter of the footplate 2-3 times the diameter of the pipe 11.

3 14-2550

In the FIG. 4, the separately formed mast foot 33 is formed by a tube which is slit for almost its entire length and is provided at the top with an annular flange 34, to which the lower end of a pipe mast, in the usual manner, can be attached.

In the embodiment shown in FIG. 5, the free ends 35 of the tongues are not attached to a footplate but directly by welding or otherwise attached to the upper end of a cylindrical, e.g. tubular, foundation 37.

In an embodiment not shown, the tongues or stripes may, in contrast, be integral with the foundation, which then consists of a steel pipe of considerably larger diameter than the pipe mast above the foot. In this case, wide slits are cut between the tongues, the free upper ends of which are bent towards each other and attached to the lower part of the mast.

In the embodiment shown in FIG. 6, the mast foot is constituted by four separate stretchers 39 which are welded to the mast and to a foot plate.

This configuration can, as shown in Fig. 7, be modified by connecting the strips 39 of cross bars 41 in a grid. The cross bars 41 are positioned so that the resistance to impacts in the direction of the mast axis is increased, while the resistance to horizontal shocks is substantially unchanged.

Finally, it should be noted that the foot can, of course, have a different number of stretchers than, as shown in the drawing, four.