a concave surface the side surfaces 45 and 47 are slightly convex curved surfaces the pin 7 and the rocker 8 have cross sections in a plane perpendicular to their elongate direction that is generally uniform along their elongate directions the pin 7 is generally straight along its elongate direction the rocker 8 forms an arc along its elongate direction positioning the rocker 8 between the rocker ends 35 and 37 away from a straight line joining the rocker ends 35 and 37 in a direction from the rocking surface 41 toward the seating surface 43 the distance from the straight line joining the rocker ends 35 and 37 increases with distance from the rocker ends 35 and 37 to a greatest deflection approximately midway between the ends 35 and 37 the configuration of the surfaces 25 27 31 33 41 43 45 and 47 are additionally described below by reference to the function of the pin 7 and the rocker 8 in the rocker joint 3 as best shown by fig2 the silent chain 1 is formed by interleaved rows of link plates 2 a row is formed across the width of the silent chain 1 by link plates 2 that are positioned adjacent to each other so that the teeth 12 and 14 of one link plate 2 of the row are adjacent to teeth 12 and 14 of an adjacent link plate 2 in that row link plates 2 of a row are separated from each other by a link plate 2 of a row of links that is adjacent along the chain direction c the silent chain 1 is formed alternately by rows 52 and 54 of link plates 2 the rows 52 are wide rows that.