GB727848A - Improvements in or relating to rail fastenings - Google Patents

Abstract

727,848. Fastening railway rails. STAMM, K. March 5, 1953 [March 5, 1952], No. 6158/53. Class 104 (2). In a rail fastening in which at least one curved or stressed leaf spring is located on the rail flange and held down by fastening means anchored to a chair-plate or to the sleeper each leaf spring is concave downwards and is held down by the heads or nuts of two fastening means which project over the rail flange and are arranged one on each side of the mid point of the spring. As shown in Fig. 1, the rail 3 is secured to a wooden sleeper, with or without the interposition of a chair-plate 2, by the heads 8 of coach screws 5 bearing downwardly on a leaf spring 10. The sides of the ends of the springs 10 are downwardly turned at 11 so as to bear against the edges of the rail base. In the arrangement shown in Fig. 4 the rail 3 is, as shown on the left-hand side of the Figure, held down by nuts 13 screwed on the ends of a U-shaped member 14 or, as shown on the righthand side of the Figure, by flanged-headed bolts 15 screwed into sleeves 17 embedded in a reinforced concrete sleeper 18. The spring 10 is, as shown on the left-hand side of Fig. 4, held in position by a U-shaped member 19 one arm 23 of which engages the rail base edge and the other arm 21 of which engages the side of the spring 10 nearest the rail webs. As shown on the right-hand side of Fig. 4 the member 19 is apertured to fit the bolt 15 and at the inner end is downwardly bent to engage the side of the spring 10. In the arrangement shown in Fig. 8 an annular groove or bead 8 formed in the frusto-conical undersurface of the screw 5 engages a curved bead or groove formed in the upper face of the spring 10. The underside of head of screw 5 and the spring 10 may be in a corrugated form in a radial direction. Fig. 11 shows an arrangement whereby the spring 10 is held down by rail spikes 29 the heads 30 of which are bent over at 31 so as to engage the side of the spring 10 and the undersurfaces 32 thereof are concave or convex in the direction transverse to the rail to prevent longitudinal or transverse displacement of the spring. The springs 10 are initially compressed by a compression device, Fig. 10, the arm 26 of which is provided with a stepped portion 28 which abuts the rail base to limit the spring compression and to leave a specified initial clearance between the bowed portion of the spring and the rail flange.