referring now to the drawings wherein like reference numerals are used throughout the various views to designate like parts and , more particularly , to fig1 according to this figure , a segment or portion of a rail generally designated by the reference numeral 1 , according to a first embodiment of the present invention , includes material parts 3 , which are pressed back or rearwardly , and material parts 5 , which are pointing or extending in the forward direction , with both parts 3 , 5 having an acute cross - sectional profile but facing in opposite directions so that the concave sides face towards each other . this gives rise to openings 2 between the transverse shear edges 4 . at each vertical side edge 6 in the openings there arises a fold area in that the plate material is folded approximately 130 °- 180 °, as shown most clearly in fig2 - 4 . in the front of the rail 1 is profiled across the entire breadth , in that the openings 2 , except the fold edges 6 in each side have a clearance corresponding to the breadth of the rail 1 . the fold edge in each side is approximately twice the thickness of the plate . the depth of the rail 1 , the breadth of the sides 9 , depends on the desired use and appearance of the rail . fig1 -- 3 and 4 illustrate different ways in which the rail 1 can be brought to an end on the rearwardly - facing side . in fig1 - 3 the sides 9 are brought to an end by being bent inwards , and in fig4 the ends of the sides are bent outwards . the sides 7 and 8 are used , for example , in the mounting of the rail . fig5 provides an example of how the manner in which two rails 1 can be assembled back - to - back by an internal strip or bracket 13 , which , in a concealed manner , couples the rails together to form a column . on a larger scale , fig6 shows the cross - sectional profile of a preferred embodiment of the rail , namely , with arcuate profile parts 3 , 5 . the center for the outwardly - projecting part 5 is c1 , and the radius of the concave side is r1 . the center for the inwardly - projecting part 3 is c2 , and the radius of the concave side is r2 . b is the total breadth of the profile , and m is the thickness of the material . the fold edges 6 are shown at both sides . the distances a and b are the distances from the cross - line over the fold edges 6 to the inner side of the parts 5 and 3 , i . e . the depth of the concave parts . the relationships which apply for the cross - sectional profile are as follows : ## equ1 ## as apparent from fig6 r2 must be less than r1 . a 19 × 19 mm rail has a largest outer dimension of 19 mm both in depth and in breadth . such a rail can thus be produced by bringing together cylindrical forming elements with a diameter of 17 . 2 mm and 16 . 0 mm . for example , the profiled front side of a rail 1 as shown in fig1 can be produced with a tool as shown sketched in fig7 a . a plate 14 , for example , a 0 . 9 mm thick iron plate , is formed between a female die member 15 and a patrix 10 which , for example , comprises a number of forwardly - projecting punches with cylindrically - rounded forming ends 11 which , for example , are cylindrical steel pieces 12 secured at the forming end . the female die member 15 comprises a longitudinal channel 16 with , for example , an arcuate bottom 17 and plane side walls 20 . the transition between the arcuate bottom 17 and the sides 20 can include a plane area 19 which lies so low that when the tool is in its bottom position , the fold edges 6 and the outwardly - projecting parts 5 of the profile do not make contact with the plane areas 19 . at intervals along the channel 16 there are provided cylindrical steel pieces 18 , these being disposed and secured in such a manner that they fill out the areas in the axial direction between the male die members 10 . the channel 16 also has a breadth which , is greater than the breadth of the male die members 10 , preferably so much broader that there is room for the plate 14 at each side , that is , the total breadth of the channel is approximately twice the plate thickness broader than the male die members 10 . the channel 16 also has rounded edges 21 at the upper surface of the female die member . as shown fig7 b - d , such a tool can be used to produce a rail profile as shown in fig1 with one workstroke , in that the front profile of the rail with section 4 , openings 2 , pressed - back parts 3 and forwardly pointing material section 5 plus folds and parallel sides 9 are all produced in one operation . as apparent from fig1 d , where the male die members 10 are in a bottom position , the plate 14 is in contact only with the forming tool parts 12 and 18 at the concave sides of the cross - sectional profile of the rail . the actual forming is thus a partly free forming , in that the convex sides of the rail are not in contact with the forming tools . if it is required to produce rails with other cross - sectional profiles , tools having female and male die members with corresponding cross - sectional profiles are used . fig8 and 9 provided examples of a second and a third embodiment of the rail according to the invention , i . e . with a cross - sectional profile which is an equilateral polygon in fig8 and with a cross - sectional profile which is a non - equilateral polygon in fig9 . depending on requirements regarding appearance or concerning the application , the cross - sectional profile of the rail can be configured with a large or a small number of sides in the polygonal cross - sectional profiles . moreover , a different number of sides can be used in the different areas , in that the cross - sectional profile can be formed in innumerable ways without deviating from the basic idea of the invention . fig1 a and 10b provide an example of manner by which a bracket can be configured and arranged in order for it to enter into engagement with a rail or column according to the invention . the bracket 24 is bent in solid or hollow material , e . g . iron or steel , preferably , with circular cross - sectional profile . the bracket has a hook - shaped bend 26 , 27 in each end , and also comprises a part which is arranged to extend horizontally . it also has a part which is arranged to extend upwardly or downwardly in an inclined manner , depending how the bracket 24 is turned . this means that the same bracket can be turned as shown both in both fig1 oa and 1ob . the rail 1 is shown secured to a wall or the like 25 . the bracket 24 is in engagement with the forwardly - facing part 5 and rests against the part 3 which is pressed rearwardly , regardless of how the bracket 24 is turned . such a bracket 24 enables the suspension of both inclined and horizontal shelves . fig1 oa and 1ob are merely an example of how a bracket can be configured and suspended in a rail according to the invention . however , from fig1 it will be clear that the bracket 24 rests against the rail in such a manner that there does not arise any point - loading on the rail , but that the load from the bracket ( and the shelf ) is distributed over a considerable part of the breadth of both the forwardly - facing part 5 and that part 3 which is pressed back .
a wall rail of iron or metal material provided with a series of openings which are produced by pressing back the plate material between a transverse section . both the pressback parts and the plate parts which remain standing between the transverse sections are configured with an arcuate or polygonal cross - section . the profiled areas extend over the entire breadth of the supporting side , and the material is formed approximately symmetrically out of the plane of the plate .