CONTACT RAIL BOND Russian patent published in 1999 - IPC

FIELD: underground railways; contact rail heavy current expansion joints. SUBSTANCE: contact rail bond has two electrically interconnected similar steel transition plates of thickness D whose surfaces are divided into support-contact section and contact section adjoining support-contact section along straight line of length l_ok. First section has form of rectangle of length l_ok and width h_ok, and second section has form of rectangular trapezium with bases l_ok and l_k < l_ok and height h_k. Conductors are electrically connected with plates within the limits of strip of width l_k corresponding to smaller base of trapezium, and support-contact sections lie as a whole, on foot of rail of width h = h_оk+Δ and are welded to rail foot over their perimeters by seat with leg Δ. Plates are arranged symmetrically relative to rail joint so that their edges of width h_ok are parallel to each other and are arranged at a distance from each other and in zone of support-contact sections of both plates not occupied by above-indicated conductors, open slots of thickness, 4Δ are made bottom pointed towards joint. Slots are made through in thickness D and alternate with step 2Δ. Walls of slots are arranged at angle α to axis of rail and are welded to its foot. Angle α is equal to . EFFECT: reduced overall dimensions, metal usage and electrical resistance of transition plates, increased uniformity of distribution of current over area of rail welded contacts. 1 tbl, 2 dwg