GB674988A - Improvements in rail track elements - Google Patents

Abstract

674,988. Railway rails and crossings. ATELIERS DE CONSTRUCTIONS J. KIHN. Sept. 14, 1949. [Sept. 17, 1948 ; Aug. 13, 1949] Nos. 23733/49 and 23784/49. Classes 104 (i) and 104 (ii). Rail tracks, switch points, and cross-overs are built up of fabricated elements comprising members of rolled, onepiece I-sectioned mild steel upon which tread portions or wear-plates made of highresistance steel are secured by welding. The track portions may oe grooveu or otherwise. In the examples described the I-sectioned girders have wide upper flanges from which portions are removed in assembling a frog crossing, as shown in Fig. 3, in order that the webs g may be juxtaposed as necessary. Longitudinal and transverse reinforcing members f, f<SP>1</SP> are welded to the webs at the intersections, and stiffening ribs j are also welded at intervals. Fig. 5 shows a cross-section of part of the frog crossing, with a hardened steel tread-plate a seated on the supporting frame and secured thereto by welds p. The correct position of the plate a may be determined by recessing its underside to form shoulders h which engage within recesses in the flanges e of the support. As shown, the plate a is provided with a pair of grooves b which converge and intersect to form the frog. The element is supported on a bed-plate k which extends beyond its ends and beneath extension rails l which join the element to stock rails d. The extension rails are welded to the bed-plate k and braced by solid blocks m in the frog-angles or by spacers n, Fig. 2 (not shown) consisting of acute-angled plates which rest on the reinforcing members f<SP>1</SP>. The solidity of the assembly may be increased by transverse bolts o or by metal pins which are secured at their extremities by welding. An example of steel suitable for forming the wear plate comprises cold-rolled nickel-chromium-molybdenum steel of a Brinell hardness of 315.