. American engineer and railroad journal . n in which they which was one of the most successful in meeting the rigorouspunishment described by Mr. Sanderson in Ins paper which wereferred to on pag< 174 la il month. In the discussion of thepaper Mr. Street stated that in a service test a car loadedwith 56,700 lbs. of scrap iron was thrown against anothersimilarly loaded with 51,600 lbs., both having the Dayton draftgear. The speed in one test was as high as miles perhour, and while the cars were rendered unfit for further ser-vice-, the damage to the draft gear was confined to a slightb
. American engineer and railroad journal . n in which they which was one of the most successful in meeting the rigorouspunishment described by Mr. Sanderson in Ins paper which wereferred to on pag< 174 la il month. In the discussion of thepaper Mr. Street stated that in a service test a car loadedwith 56,700 lbs. of scrap iron was thrown against anothersimilarly loaded with 51,600 lbs., both having the Dayton draftgear. The speed in one test was as high as miles perhour, and while the cars were rendered unfit for further ser-vice-, the damage to the draft gear was confined to a slightbending of the followers and Two tests in the 300,000-lb. testing machine at Purdue Uni-versity were also recorded. The loads were applied to theend of the coupler witfl the knuckle removed, and althoughthe capacity of the machine was exhausted in the case of themalleable draft sills, the rigging was yet in condition to beused after the test. And when a load of 250,000 lbs. wasleft on the rigging for 12 hours, after the test, the permanent. ^W W IT The Dayton Twin-Spring Draft Gear—Inverted Plan- are applied. These ribs extend inwardly to a point beyond thecenter of each spring, and therefore the strains applied to thestop bars and followers are crushing strains. The ribs on therear end of each sill plate form a box which gives great strengthand at the same time furnishes a guide to prevent the tail straphaving too much side play. In working out this design three objects have been sought,namely, to eliminate bending and shearing strains; to keep thenumber of parts at the minimum; and to bind the draft sillstogether. These objects seem to have been attained. The bend-ing and shearing strains which are so destructive have beenreduced to direct crushing strains. The rigging complete percar, as furnished by the makers, consists of four sill plates,four stop bars and four followers. This leaves the railroad tofurnish only two tail straps, four springs and 20 bolts per a
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
