Patent GB-884237-A (GB)
Title: Concrete railway sleepers and rail-fastening arrangements employing them
Inventor: PANDE-ROLFSEN PER
IPC: E01B9/30
Filed: 1959-02-20
Abstract: 884,237. Fastening railway rails to concrete sleepers. LOCKSPIKE Ltd. Feb. 19, 1960 [Feb. 20, 1959], No. 6033/59. Class 104(2). A concrete sleeper has anchored or fitted in recesses therein metal members which afford four straight passages open at least at one end and extending the width of the sleeper, there being two such passages towards one end of the sleeper, spaced apart in the length direction of the sleeper a distance slightly greater than the width of a rail base flange, and two passages, similarly spaced, at the other end of the sleeper and the sleeper is also provided with additional metal portions which form part of the upper surface of the sleeper on that side of each passage which is remote from the adjacent passage. In the arrangement shown in Figs. 5 and 6 of the Complete Specification, a concrete sleeper is cast with four; one on each side of a rail flange seat 21, square cross-section recesses 50 extending over the width of the top of the sleeper. Leading into each recess 50, on the side remote from the seat 21, are two triangular spaced slots 51. A rectangular steel plate 52, stepped at 53 and having a trapezoidal portion 54 cut away from one of its longer sides, is split at 55 and has triangular flaps 56 bent downwardly at right angles to the plate face. A tube 20 is welded to the underside of the plate 52 and to the lower edges of the flaps 56 and the assembly is fitted in the sleeper with the tube 20 lying in the recess 50 and the flaps 56 lying in the slots 51. The Provisional Specification shows in Fig. 1 an arrangement in which the arms 24, 25 of Y-shaped members, embedded in the concrete sleeper 18, form the comer members of a rail flange seat 21 and an arm 27, the anchor in the sleeper. A plate 26 arranged perpendicular to the arm 24 forms a seating on the sleeper top for the third or fifth portion of the fastener described with referenc to Figs. 1 to 3 (not shown) of the Complet Specification. Four tubes 20, which may b integral with or secured to the arm 27, ar embedded in the sleeper 18, one on each sid of the rail seat 21 and below the sleeper top In a further modification shown in Fig. 2, the arm 27 of the Y-shaped member is attached to the tube 20 embedded in a rib 28 extending across the width and above the sleeper top. A sheet metal plate 31 extending from the tube 20 constitutes the upper surface of the sleepe beyond the rib 28. A further sheet meta member 32 extends from the tube 20 towards the sleeper base. In yet a further modification shown in Figs. 3A and 3C, the passages for the first arms of the above-mentioned fasteners an formed by bending a steel rod into a helix 35 Arms 36, extending downwardly from each end of the helix 35 and upwardly turned at their ends 38, are embedded in the concrete sleeper 18 to the extent that the axis of the passage formed by the helix 35 is level with the sleeper top 37. Grooves 39 are formed in the sleeper top at each end of the helix 35. In a further embodiment shown in Figs. 5A, 5B straight limbs 41, arranged side-by-side, are bent away from the middle 42 of the bar and the free ends of each limb 41 is bent to form helices 43, 44 for the passages of the first arm of the fastener The end parts 45, 46 of the bar are bent back wards along the outside of the helices 44, 43 or opposite sides thereof. If the rail is to be electrically insulated from the sleeper the rail fastening parts may be embedded in electrically insulating cement or covered with rubber. Specifications 861,473 and 869,385 are referred to.