Guard rail

Guard rail comprising an inclined handrail and vertical bars of a width L in the plane of the guard rail and which forms with the horizontal an angle capable of varying between two limits .alpha.-.delta..alpha. and .alpha.+.delta..alpha., the said handrail being itself essentially constituted by an open profile section of generally U-shaped cross-section in which the side walls of the profile extend in the direction away from the handrail and with the web of the profile being of a thickness l, ribs extending inwardly from said side walls, perforations in the web of the hand rail dimensioned to allow the ends of the vertical bars to traverse the said web, at least one notch in the end portion of said vertical bar to be secured by clipping on ribs extending inwardly from the side walls of the handrail, said guard rail being characterized in that on the one hand the perforations in the web of the hand rail have in the plane of the guard rail a horizontally measured width L + e (tg.delta..alpha./cos.alpha.) and in that, on the other, the bearing surface of each notch on the corresponding rib of the rail is defined by a surface of revolution tangent to the bearing surface of the rib, the axis of this surface of revolution being at right-angles to the plane of the guard rail and traversing this plane beyond the rail with respect to the portion of the plane in which the vertical bars are located.