. American engineer and railroad journal . desirable to use a smaller number of them than this would callfor and the form was modified slightly so as to utilize each camfor a maximum number of engines, but not enough to bring theleverage far out of the way. The levers were worked out by the plan shown in Fig. 2, inwhich the following relations obtain: A = length of lever from center of suspension to center ofbrakehead conection. B - length of lever from center of brakehead to center of camconnection. C = length of lever from center of suspension to center of L = length of trave
. American engineer and railroad journal . desirable to use a smaller number of them than this would callfor and the form was modified slightly so as to utilize each camfor a maximum number of engines, but not enough to bring theleverage far out of the way. The levers were worked out by the plan shown in Fig. 2, inwhich the following relations obtain: A = length of lever from center of suspension to center ofbrakehead conection. B - length of lever from center of brakehead to center of camconnection. C = length of lever from center of suspension to center of L = length of travel of lever at the point of cam connection,allowing 3i inches for wear of shoe and tire. M = radius of the arc a a. With a radius equal to the distance from the point 1, on the arcK K, to the point S, on the line J J, and with X as a center,strike the arc h h, intersecting the horizontal line 7 7. Withradii equal to the distance from each successive point on the arcK Kto the points, on the line (the point of contact of cams),and with .V as a center, draw the arcs c c, rf d. etc., intersectingeach successive subdivision of the line ./J. The points of inter-section of the arcs b b, c c, etc., with the lines T 7. 6 0, etc., formthe loci of the periphery of the cam face. On the arc x y locate the link pin It inches from face of cam. The form of the levers is shown in Fig. 4. There are seven -«: —-i.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
